JP4098952B2

JP4098952B2 - Timepiece dial and method for manufacturing the same

Info

Publication number: JP4098952B2
Application number: JP2000335074A
Authority: JP
Inventors: 正昭佐藤
Original assignee: シチズンセイミツ株式会社
Priority date: 2000-11-01
Filing date: 2000-11-01
Publication date: 2008-06-11
Anticipated expiration: 2020-11-01
Also published as: JP2002139578A

Description

【０００１】
【発明の属する技術分野】
本発明はソーラセル用の時計用文字板及びその製造方法に関する。
【０００２】
【従来の技術】
ソーラセル用の時計用文字板に、金属感を出現させると共にソーラセルの濃紫色が見えないようにする技術の一つとして従来図１０に示す構成のものがある。図１０は時計用文字板の要部拡大断面図を示すもので、この時計用文字板は透明なプラスチック板などからなる透過性基板１の下面に小孔２ａが均等間隔に多数設けられた金属膜２を形成した構成となっている。そして、この小孔２ａは３０μｍより小さく形成されている。小孔の大きさが３０μｍより小さいとその小孔自体が目に殆ど見えず、従って、その下に配設されるソーラセル自体も全く見えない。
【０００３】
時計用のソーラセルは一般的に、図１１に示すように４等分割された４面（Ａ1、Ａ2、Ａ3、Ａ4）に設けられて、文字板の下面側に配設される。そして、文字板からの透過光量は４面に等しく放射されるように設計される。小孔２ａを均等間隔に設けることによって４等分割されたソーラセルのそれぞれに等しく透過光が放射される。更に、均等間隔に多数設けられる小孔２ａは、その小孔２ａの総面積が文字板面積の２５〜５０％の範囲内で設けられる。小孔２ａの総面積が２５％あれば透過率が２５％確保でき、十分な発電量を得ることができる。また、この小孔２ａの総面積が５０％を越えるとソーラセルの濃紫色が強く見えてくるようになる。
【０００４】
上記構成の時計用文字板は図１２に示す工程によって形成される。図１２は製造方法を示す工程説明図である。図１２（ａ）は透明なプラスチック板などからなる透過性基板１に金属膜２を形成した状態を示す図で、金属膜２は蒸着方法によって形成する。この金属膜２はアルミ、ニッケルなどの各種の金属が選択でき、その厚みは光が透過しない程度の厚みに形成される。
【０００５】
次に、図１２（ｂ）は図１２（ａ）で形成した金属膜２の上面にレジスト膜３を形成した状態を示す図で、レジスト膜３は印刷や塗装などの公知の方法で形成される。
【０００６】
次に、図１２（ｃ）は露光工程を示し、レジスト膜３の上面側にネガパターンフィルム４を載置して紫外線を照射し、露光している状態を示す図である。このネガパターンフィルム４は、小孔２ａが均等間隔に多数設けた金属膜２に等しく対応させた被印刷体形状のネガパターンフィルムで、このネガパターンフィルム４の上から紫外線を照射してレジスト膜３を露光硬化させる。これによって、レジスト膜３の小孔２ａに対応する部分は紫外線が照射されないので柔らかい状態にあり、それ以外の部分（図中矢印で示す）は紫外線が照射されて硬化状態になる。
【０００７】
次に、図１２（ｄ）はレジスト膜３に小孔３ａを形成した状態を示す図である。図１２（ｃ）で露光されなかったレジスト膜３の柔らかい部分（ちょうど小孔２ａに対応する部分にあたる）を剥離液でもって剥離すると、小孔３ａを形成したレジスト膜３が得られる。このレジスト膜３の小孔３ａ部分は金属膜２の小孔２ａ部分に対応する。
【０００８】
次に、図１２（ｅ）はレジスト膜３の小孔３ａ部分に露出する金属膜２をエッチング液によって剥離し、小孔２ａを形成した状態を示す図である。エッチング液で露出している金属膜２を剥離することによって小孔２ａが形成される。
【０００９】
次に、図１２（ｆ）は残っているレジスト膜３を全部剥離して金属膜２を露出させた状態を示す図である。剥離液でレジスト膜３を全部剥離することによって小孔２ａを形成した金属膜２が現れる。このようにして文字板の金属膜２を形成し、この金属膜２の面を下面側にして使用すれば図１０に示す構成の文字板が得られる。
【００１０】
【発明が解決しようとする課題】
このような方法で形成したソーラセル用の時計用文字板は、金属感が現れて、しかもソーラセルの濃紫色が全く見えないものになる。しかしながら、製作工程が多いためコスト的に非常に高いものになっていた。また、小孔が非常に小さいため、寸法精度や位置精度もレジスト膜の厚みやフィルムの伸縮、及び金属膜のサイドエッチングなどの影響を受け、非常に精度良く仕上げることが難しいものとなっていた。従って、歩留まりも低いものとなり量産性には向いていなかった。また、エッチング液や剥離液を使用することから身体的に好ましい作業とは言えないものであった。
【００１１】
【課題を解決するための手段】
本発明は上記課題に鑑みて成されたもので、その目的とするところは簡単な作業であって安いコストで製作でき、しかも精度良く作ることができて、且つ身体に害のない安全な作業で製作することができるソーラセル用時計用文字板及びその製造方法を提供することである。
【００１２】
そして課題を解決するための手段として、時計用文字板においては、請求項１に係る発明は、ソーラセルと、該ソーラセルの上側に配置された透過性基板であって、該透過性基板の下面に模様状に形成された凹凸部を有し、前記凹部には非透過膜を有し、前記凸部の上面は平滑面になっていて透過性を有し、前記凸部の高さが少なくとも１０μｍ以上であって、凸部の上面は、その総面積が前記透過性基板の面積に対して２０〜５０％を有し、更に、この平滑な上面の幅は７０μｍより細いことを特徴とする。
【００１３】
また、請求項２に係る発明は、ソーラセルと、該ソーラセルの上側に配置された透過性基板であって、該透過性基板の下面に模様状に形成された凹凸部を有し、前記凹部には透過性カラー装飾膜と非透過膜とを積層して有し、前記凸部の上面は平滑面になっていて透過性を有し、前記凸部の高さが少なくとも１０μｍ以上であって、凸部の上面は、その総面積が前記透過性基板の面積に対して２０〜５０％を有し、更に、この平滑な上面の幅は７０μｍより細いことを特徴とする。
【００１４】
また、請求項３に係る発明は、前記模様状に形成された凹凸部は一定な間隔で並んで形成されていることを特徴とする。
【００１５】
また、請求項４に係る発明は、前記凹凸部の模様はストライプ模様、格子模様、サークル模様、幾何学模様などであることを特徴とする。
【００１６】
また、請求項５に係る発明は、前記非透過膜は金属膜又は塗料膜であることを特徴とする。
【００１７】
また、請求項６に係る発明は、前記透過性カラー装飾膜は金属薄膜又は塗料膜であることを特徴とする。
【００１８】
また、請求項７に係る発明は、ソーラセルと、該ソーラセルの上側に配置された透過性基板であって、該透過性基板の下面に模様状に形成された凹凸部を有し、前記凹部には非透過膜を有し、前記凸部の上面は平滑面になっていて透過性を有し、前記凸部の高さが少なくとも１０μｍ以上であって、凸部の上面は、その総面積が前記透過性基板の面積に対して２０〜５０％を有し、この平滑な上面の幅は１００μｍより細く、更に、前記透過性基板の上面に凹凸部を有する第２の模様が形成されていることを特徴とする。また、請求項８に係る発明は、ソーラセルと、該ソーラセルの上側に配置された透過性基板であって、該透過性基板の下面に模様状に形成された凹凸部を有し、前記凹部には透過性カラー装飾膜と非透過膜とを積層して有し、前記凸部の上面は平滑面になっていて透過性を有し、前記凸部の高さが少なくとも１０μｍ以上であって、凸部の上面は、その総面積が前記透過性基板の面積に対して２０〜５０％を有し、更に、この平滑な上面の幅は１００μｍより細く、更に、前記透過性基板の上面に凹凸部を有する第２の模様が形成されていることを特徴とする
【００１９】
次に、時計用文字板の製造方法においては、請求項９に係る発明は、金型を使用してプラスチック射出成形方法又は透過性のプラスチック板を加熱・加圧した方法によって、下面に一定の間隔で並んだ模様状の凹凸部を有し、且つ、該凸部上面の幅が７０μｍより細い透過性基板を形成する工程と、前記透過性基板の凹凸部に蒸着方法又は塗装方法によって非透過膜を形成する工程と、切削方法又は研磨方法によって前記透過性基板の凸部の非透過膜を除去すると共に、前記凸部の上面を平滑面に形成し、前記凸部の高さが少なくとも１０μｍ以上であって、且つ、該凸部上面の総面積が前記透過性基板の面積に対して２０〜５０％にする工程と、を有することを特徴とする。
【００２０】
また、請求項１０に係る発明は、金型を使用してプラスチック射出成形方法又は透過性のプラスチック板を加熱・加圧した方法によって、下面に一定の間隔で並んだ模様状の凹凸部を有し、且つ、該凸部上面の幅が７０μｍより細い透過性基板を形成する工程と、前記透過性基板の凹凸部に蒸着方法又は塗装方法によって透過性カラー装飾膜を形成する工程と、金属感と装飾感を高めるため前記形成した透過性カラー装飾膜の上に蒸着方法又は塗装方法によって非透過膜を形成する工程と、切削方法又は研磨方法によって前記透過性基板の凸部の非透過膜と透過性カラー装飾膜とを除去すると共に、前記凸部の上面を平滑面に形成し、前記凸部の高さが少なくとも１０μｍ以上であって、且つ、前記凸部上面の総面積が前記透過性基板の面積に対して２０〜５０％にする工程と、を有することを特徴とする。
【００２５】
また、請求項１１に係る発明は、前記模様状の凹凸部は一定な間隔で並んで形成され、前記凹凸部の模様はストライプ模様、格子模様、サークル模様、幾何学模様などであることを特徴とする。
【００２６】
また、請求項１２に係る発明は、前記非透過膜は金属膜又は塗料膜であることを特徴とすることを特徴とする。
【００２７】
また、請求項１３に係る発明は、前記透過性カラー装飾膜は金属薄膜又は塗料膜であることを特徴とする。
【００２８】
また、請求項１４に係る発明は、金型を使用してプラスチック射出成形方法又は透過性のプラスチック板を加熱・加圧した方法によって、上面に凹凸部を有する第２の模様を形成し、下面に一定の間隔で並んだ模様状の凹凸部を有し、且つ、該凸部上面の幅が１００μｍより細い透過性基板を形成する工程と、前記透過性基板の下面の凹凸部に蒸着方法又は塗装方法によって非透過膜を形成する工程と、切削方法又は研磨方法によって前記透過性基板の凸部の非透過膜を除去すると共に、前記凸部の上面を平滑面に形成し、前記下面の凸部の高さが少なくとも１０μｍ以上に形成し、且つ、該凸部上面の総面積が前記透過性基板の面積に対して２０〜５０％にする工程と、を有することを特徴とする。また、請求項１５に係る発明は、金型を使用してプラスチック射出成形方法又は透過性のプラスチック板を加熱・加圧した方法によって、上面に凹凸部を有する第２の模様を形成し、下面に一定の間隔で並んだ模様状の凹凸部を有し、且つ、該凸部上面の幅が１００μｍより細い透過性基板を形成する工程と、前記透過性基板の下面の凹凸部に蒸着方法又は塗装方法によって透過性カラー装飾膜を形成する工程と、金属感と装飾感を高めるため前記形成した透過性カラー装飾膜の上に蒸着方法又は塗装方法によって非透過膜を形成する工程と、切削方法又は研磨方法によって前記透過性基板の凸部の非透過膜と透過性カラー装飾膜とを除去すると共に、前記凸部の上面を平滑面に形成し、前記下面の凸部の高さが少なくとも１０μｍ以上に形成し、且つ、前記凸部上面の総面積が前記透過性基板の面積に対して２０〜５０％にする工程と、を有することを特徴とする。
【００２９】
【発明の実施の形態】
以下、図面に基づいて本発明の実施形態を説明する。先ず本発明の第１の実施形態に係わる時計用文字板とその製造方法を図１〜４に基づいて説明する。図１は時計用文字板の要部拡大断面図、図２は図１に示す時計用文字板をその下面側から見た要部拡大斜視図である。また、図３は図１に示す時計用文字板の一製造方法を示す工程説明図、図４は他の製造方法を示す工程説明図である。
【００３０】
図１において、文字板１０はその下面に凹部１１ｂと凸部１１ａを形成した透過性基板１１と、凹部１１ｂの面に形成した金属の非透過膜１２を有している。また、この文字板１０は図中省略してあるが、透過性基板１１の上面側に時字やマークなどの指標が形成されて完成の仕上がりが成される。
【００３１】
上記凸部１１ａの上面（図中では下表面にあたる）１１ａ1は研磨されて透過性基板１１が露出し、更に平滑面になっている。また、この凸部１１ａはその高さ（ｈ）が少なくても１０μｍ以上あって、上面１１ａ1の幅（ｔ）は７０μｍ以下に形成されている。
【００３２】
図２は文字板１０の下面側から見た要部斜視図である。凸部１１ａと凹部１１ｂは一定の間隔で並んで格子状に形成されており、全体的に格子模様を成している。また、図２において、凸部１１ａの上面１１ａ1は研磨されて平滑面になっている。そして、研磨された上面１１ａ1の総面積は透過性基板１１の上面側の面積に対して２０〜５０％の範囲で形成されているものである。
【００３３】
上記金属の非透過膜１２は金属を蒸着方法によって形成した金属蒸着膜で、光が透過しない程度の厚みで形成したものである。特に金属に限定するものではなく、印刷や塗装方法で光が透過しない程度の厚みに形成した塗料膜であっても良いものである。
【００３４】
上記構成の文字板１０においては、凹部１１ｂ部分では非透過膜１２によって光が透過せず、むしろ反射作用が現れて非透過膜の色調が見える。また、凸部１１ａの部分では光が透過してその下面に配設したソーラセル（図中略）に入射する。そして、凸部１１ａの上面１１ａ1は平滑面になっているので散乱することなく入射して入射効率を高める。
【００３５】
更に、凸部１１ａの部分から光が透過するものの、その上面１１ａ1の幅が非常に細いためにソーラセルの濃紫色は殆ど見えない。僅かにカラー着色した透過性基板の下では上面１１ａ1の幅が７０μｍ以下であるとソーラセルの濃紫色は殆ど確認されない。特に、３０μｍ以下になると透明基板であっても全く視認されない。
【００３６】
また、凹部１１ｂと凸部１１ａが下面側に一定の間隔で並んで形成しており、凸部１１ａの上面１１ａ1の総面積が文字板１０の上面側の面積の２０〜５０％範囲内に形成されているので、ソーラセルの発電に十分な光量を与えることができる。近年のソーラセルには少なくとも２０％位の透過率で十分な発電量を得るものが現れてきている。従って、透過部分である上面１１ａ1の総面積が上面側の面積の２０％有れば２０％の透過率が得られ発電に支障のない光量が得られることになる。また、透過部分である上面１１ａ1の総面積が上面側の面積の５０％を越えてくると非透過膜が目立たなくなりソーラセルの濃紫色が目立って見えてくるようになる。このことから、透過部分である上面１１ａ1の総面積を２０〜５０％の範囲内におさめることによって十分な発電量を得ると共に非透過膜が大きく目について凸部１１ａの透過部分が全く目立たない。
【００３７】
この実施形態は凹凸模様を格子模様に形成したものであるが、ストライプ模様、サークル模様、旭光模様、幾何学模様など各種の模様が同様に選択できるものである。
【００３８】
次に、上記構成の文字板１０の製造方法を図３及び図４に基づいて説明する。図３は一製造方法の製造工程を示す工程説明図で、いずれも要部断面図で示してある。先ず、図３（ａ）は射出成形方法で形成した下面に凹部１１ｂと凸部１１ａを有する透過性基板１１のブランク１１Ａを示している。このブランク１１Ａは射出成形装置を用いて透過性樹脂を加熱・加圧の基で金型内に射出して成形される。下面の凹凸部は金型に形成した凹凸部から転写によって形成される。
【００３９】
次に、図３（ｂ）は凹凸部のある下面全体に金属蒸着膜からなる非透過膜１２を形成した図である。射出成形方法によって形成した透過性基板１１のプランク１１Ａの下面全体に蒸着装置で金属蒸着を施して金属蒸着膜の非透過膜１２を形成する。この金属蒸着膜は光が透過しない程度の厚み（概ね１０００Å以上）に形成する。尚、この非透過膜１２は塗装方法で光が透過しない程度の厚みに形成した塗料膜でも良いものである。
【００４０】
図３（ｃ）は凸部１１ａの上面を研磨して非透過膜１２を除去し、平滑な上面１１ａ1に仕上げた状態を示す図である。研磨装置によって非透過膜１２が形成された凸部１１ａの上面側を透過性基板が露出する程度まで研磨し、非透過膜１２を除去すると共に平滑な上面１１ａ1に仕上げる。尚、本実施の形態においては研磨方法で平滑面に仕上げたが、ダイヤバイトなどを使用して切削方法で平滑面に仕上げても良いものである。
【００４１】
以上の製造方法によって文字板１０が得られる。上記実施例は片面に凹凸を有する透過性基板を得るのに金型を用いて射出成形方法で形成したものであるが、他の方法として図４に示す方法がある。図４に示すものは、平坦な載品台２２上に透過性のプラスチック板２１Ｂを載せ、上から凹凸（２３ａ、２３ｂ）の形成された押圧具２３でもって加熱の基で加圧すると上記図３（ａ）で示した透過性基板１１のブランク１１Ａと同じ形状のものが得られる。
【００４２】
以上の製造方法をとれば、透過性基板の模様状の凹凸部は、金型または押圧具に形成した模様状の凹凸形状から転写によって形成されるので、寸法及び形状はバラツキの少ない非常に安定した精度で形成することができる。更に、凹凸形状を形成した金型または押圧具は長期間に渡って使用できると共に、この製造加工時間も短時間でできるので量産性に優れ、加工コストも非常に安くすることができる。また、後加工も蒸着加工または塗装加工、研磨加工と簡単な加工方法をとるのでトータルの加工時間も少なくて済み、コスト的にも非常に安くすることができる。更にまた、従来使用した剥離液とかエッチング液などは使用しないので身体への悪影響はなく健康的な作業が可能となる。
【００４４】
次に、本発明の第２の実施形態について図５乃至図７に基づいて説明する。図５は本発明の第２の実施形態に係わる時計用文字板の要部拡大断面図、図６は図５に示す時計用文字板を下面側から見た要部断面拡大斜視図である。図７は図５に示す時計用文字板の一製造方法を示す工程説明図である。
【００４５】
図５において、この文字板３０は、その下面側に凹部３１ｂと凸部３１ａが形成された透過性基板３１と、凹部３１ｂに設けられた透過性カラー装飾膜３３、このカラー装飾膜３３の上に積層された非透過膜３２を有している。また、図示してないが、透過性基板３１の上面側には時字やマークなどの指標が形成されて完成の仕上がりが成される。
【００４６】
ここでの凸部３１ａは山型状の形状を成しているもので、その上面（図中では下表面）３１ａ1は研磨されて透過性基板３１が露出して平滑面になっている。この上面の平滑面はダイヤバイトを用いて切削方法で形成しても良い。また、この凸部３１ａは、第１の実施形態と同様に、その高（ｈ）さが少なくとも１０μｍ以上あって、上面３１ａ1の幅（ｔ）は７０μｍ以下に形成されている。
【００４７】
また、この凸部３１ａ及び凹部３１ｂは、図６より、一定の間隔にサークル状に並んでサークル模様を形成している。また、この凸部３１ａの平滑な上面３１ａ1の総面積は、透過性基板３１の上面側の面積に対して２０〜５０％の範囲で形成されている。
【００４８】
上記透過性カラー装飾膜３３は、カラー装飾を施すための膜で透過性を持っている。本実施の形態では非常に薄い金属蒸着膜で形成しているが、透過性を有するカラー塗料膜であっても良い。装飾を施したい色調の金属膜や塗料膜を選択する。
【００４９】
上記非透過膜３２は本実施の形態では白色塗料膜で形成しているが、金属蒸着膜でも良く、光が透過しない程度の厚みに形成する。本実施の形態では透過性カラー装飾膜３３に金属蒸着膜、非透過膜３２に白色塗料を用いたが、この組み合わせの方がより金属感が現れるからである。また、金属薄膜の透過性カラー装飾膜と塗料の非透過膜との組み合わせ、塗料の透過性カラー装飾膜と金属の非透過膜の組み合わせを行うことにより金属感を出させると共に装飾性を高めることができる。
【００５０】
次に、上記文字板３０の製造方法を図７に基づいて説明する。図７（ａ）は金型を用いて射出成形装置で形成したプラスチックの透過性基板３１のブランク３１Ａを示している。このブランク３１Ａの下面には凹部３１ｂと三角山型の凸部３１ａが形成されており、いずれも射出成形時に金型から転写して形成する。尚、前述の第１の実施形態で図４に基づいて説明したように、凹凸の設けた加圧具を用い、プラスチック板を加熱の下で加圧して凹凸を形成しても良い。また、凹部３１ｂと凸部３１ａは、図６で説明したように、サークル状の模様に形成されているものである。
【００５１】
図７（ｂ）はブランク３１Ａの凹凸面上に非常に薄い金属蒸着を施し、透過性カラー装飾膜３３を形成した状態を示している。前述したごとく、この透過性カラー装飾膜３３は透過性のカラー塗料膜であっても良い。
【００５２】
図７（ｃ）は上記図７（ｂ）で形成した透過性カラー装飾膜３３の上に白色塗装を施して塗料の非透過膜３２を形成した状態を示している。ここでの非透過膜３２は光が透過しない程度の厚みに形成する。また、本実施形態では白色塗料を施したが、特に限定するものではなく他の塗料或いは前述したように金属蒸着膜であっても良い。
【００５３】
図７（ｄ）は研磨装置で研磨して凸部３１ａの山を一部削り取ってブランク３１Ａを露出させ、凸部３１ａの上面３１ａ1を平滑面に仕上げた状態を示している。この上面３１ａ1の幅は７０μｍ以下の細さに抑えられ、サークル状に現れる凸部３１の上面３１ａ1の総面積は透過性基板３１の上面の面積に対して２０〜５０％の範囲内に抑えられている。本実施の形態では研磨方法で凸部３１ａの山を削り、凸部３１ａの上面３１ａ1を平滑面に仕上げたが、ダイヤバイトなどを使用して切削方法で平滑面に仕上げることもできる。
【００５４】
以上の作業工程を経ることによって図５で示した文字板３０を得ることができる。この文字板３０は、光を透過する部分の幅が７０μｍ以下と非常に狭い。このため、その下面側に配設されるソーラセルの濃紫色が濃紫色として視認されない。また、幅が３０μｍ以下であると透過部分そのものが見えないため全くソーラセルの色調が見えない。更に、サークル模様状に均一間隔に形成されていると共に光の透過部分の総面積が２０〜５０％以下の範囲にあるため十分な発電量が得られ、外観的にもカラー装飾膜及び非透過膜の色調などが大きくクローズアップされ、透過部分は殆ど目立たない。
【００５５】
また、本実施形態のように凸部を傾斜のもった山型に形成すると、研磨によって光透過部分の大きさを任意に設定することが可能となる。従って、全く視認されない３０μｍ以下の幅も簡単に形成することができる。
【００５６】
次に、本発明の第３の実施の形態に係わる時計用文字板及びその製造方法を図８及び図９に基づいて説明する。図８は本発明の第３の実施の形態に係わる時計用文字板の要部拡大断面を示しており、図９はこの時計用文字板の製造方法を説明する工程説明図で、要部拡大断面図を示している。
【００５７】
図８より、この文字板５０は、その下面に凹部５１ｂと山型形状の凸部５１ａを有し、その上面に第２の模様５１ｄを有する透過性基板５１と、透過性基板５１の下面凹部５１ｂに設けた非透過膜５２と、透過性基板５１の上面の第２の模様５１ｄ上に設けた透明保護膜５４とを有している。また、図示はしてないが透明保護膜５４の上面に時字やマークなどの指標が形成されて完成の仕上がりが成される。
【００５８】
上記透過性基板５１の下面側に設けられている山型形状の凸部５１ａの上面５１ａ1は、研磨方法または切削方法によって削られて平滑面になっており、透過性基板５１の素地が露出している。そして、凸部５１ａの高さ（ｈ）は少なくとも１０μｍ以上あって、平滑な上面５１ａ1の幅（ｔ）は大きくても１００μｍ以下に形成されている。
【００５９】
透過性基板５１の下面側に設けた凹部５１ｂと凸部５１ａは、図６で示した第２の実施の形態の文字板３０と同様、一定の間隔にサークル状に並んでサークル模様状にできている。また、この凸部５１ａの平滑な上面５１ａ1の総面積は透過性基板５１の上面側の面積に対して２０〜５０％の範囲内で形成されている。
【００６０】
凹部５１ｂに形成した非透過膜５２は本実施の形態では金属蒸着膜を形成しているが、これは塗料膜であっても良いものである。光が透過しない程度の厚みに形成すれば良い。
【００６１】
透過性基板５１の上面側に設けた第２の模様５１ｄは本実施の形態では微小の凹凸を成す梨地模様を形成しているが、この第２の模様５１ｄは梨地模様の他に旭光模様，各種の編み目模様、各種の幾何学模様など色々な模様を選択することができる。
【００６２】
透過性基板５１の第２の模様５１ｄ上に設けた透明保護膜５４は第２の模様５１ｄを保護するために設けるもので、透明なウレタン樹脂やアクリル樹脂などの塗料を用いて印刷方法や塗装方法などで形成したものである。そして、この透明保護膜５４の上面は研磨されて光沢のある平滑面に仕上げられている。
【００６３】
本実施の形態においては、透過性基板５１の凸部５１ａの平滑な上面５１ａ1の幅は前述した第１の実施の形態、及び第２の実施の形態の幅より少し大きく形成されて、１００μｍ以下に抑えられている。透過性基板の上面側に凹凸のある第２の模様があると、１００μｍの幅があってもソーラセルの濃紫色は殆ど見えない。特に、第２の模様が模様目の細かい模様になってくると濃紫色は全く視認されなくなってくる。
【００６４】
また、透過性基板５１の凸部５１ａの平滑な上面５１ａ1の総面積が上面側の面積に対して２０〜５０％の範囲に抑えているので発電に必要な十分な光量を得ることができ、また、非透過膜の色が目立って見えてソーラセルの濃紫色は殆ど見えない。
【００６５】
本実施の形態では、透過性基板５１の上面に形成した第２の模様が透過性基板５１の下面凹部５１ｂに施した非透過膜５２の色調のもとで見える文字板が得られる。
【００６６】
次に、上記構成を成す文字板５０の製造方法を図９に基づいて説明する。図９（ａ）は射出成形方法で形成した下面に凹部５１ｂと山型状の凸部５１ａを有し上面に梨地模様からなる第２の模様５１ｄを有する透過性基板５１のブランク５１Ａを示している。下面の凹部５１ｂや山型状の凸部５１ａと上面の第２の模様５１ｄは金型から転写して形成する。
【００６７】
次に、図９（ｂ）はブランク５１ａの凹凸部（５１ｂ、５１ａ）面上に金属蒸着膜を蒸着方法でもって形成し、金属蒸着膜の非透過膜５２を形成した状態を示している。金属蒸着膜は光が透過しない程度の厚みに形成する。
【００６８】
次に、図９（ｃ）は研磨方法または切削方法によって凸部５１ａの山の一部を削り取ってブランク５１Ａを露出させ、凸部５１ａに平滑な上面５１ａ1を形成した状態を示している。
【００６９】
次に、図９（ｄ）は透過性基板５１の上面の第２の模様５１ｄ上に透明保護膜５４を印刷方法または塗装方法でもって形成し、更に、この透明保護膜５４の上面を研磨方法でもって平滑面に仕上げた状態を示している。
【００７０】
以上説明した製造方法を取ることによって本実施の形態の時計用文字板５０が得られる。製造方法が簡単で、しかも製造工程数も少ないので安いコストで製作することが出来る。また、光を透過する部分となる凸部５１ａの平滑な上面５１ａ1は切削方法或いは研磨方法で形成するので寸法管理が非常に容易となり、幅寸法などにおいて寸法精度の良い品質が得られる。
【００７１】
【発明の効果】
以上詳細に説明したように、本発明の時計用文字板の形成方法は、射出成形方法或いは型打方法でもって透過性基板の下面に凹凸部を模様状に形成する。そして、凹凸部の面に非透過膜を形成した後、切削方法や研磨方法によって凸部の非透過膜を除去して光が透過する平滑な凸部上面を形成する。そして、光が透過する凸部上面の幅を１００μｍ以下の細さに抑えている。また、凸部上面の総面積を基板上面の面積に対して２０〜５０％の範囲に抑えている。
【００７２】
透過性基板の上面に凹凸のある第２の模様を形成したときにおいては、光が透過する下面の凸部上面幅を１００μｍ以下に抑えてあることから第２の模様の影響を受けてソーラセルの濃紫色は殆ど視認されない。また、第２の模様を形成していないときであっても７０μｍの幅の基では濃紫色として殆ど確認されない。特に、基板に僅かな着色などの装飾が施されていれば濃紫色は殆ど視認されない。
【００７３】
また、下面に形成する凹凸部は凹部と凸部が一定の間隔に並んだ模様状に形成してあり、そして、光が透過する下面の凸部上面の総面積を基板上面の面積に対して２０〜５０％の範囲に抑えていることから発電に必要な光量を十分に確保することができ、更に、非透過膜の色が目立って見えてソーラセルの濃紫色は殆ど視認されない。
【００７４】
また、透過性基板と非透過膜との間に透過性カラー装飾膜を介在させることによって各種のカラー装飾を持った文字板が得られる。
【００７５】
また、非透過膜や透過性カラー装飾膜に金属蒸着膜を選択すると全体的に金属感の現れた文字板が得られる。
【００７６】
また、透過性カラー装飾膜と非透過膜に異なる色感を持たせることによって、また、透過性基板の下面に形成する凹凸部の模様に色々な模様を選択することによって、更には、透過性基板の上面に第２の模様をも設けることによって、また、この第２の模様に色々な模様を選択することによってカラー装飾性や模様装飾性を高めることができると共に、色々な装飾バリエーションを得ることができる。
【００７７】
また、製造方法も簡単でその製造工程も少ないので、非常に安いコストで製作できる。
【００７８】
また、模様状の凹凸は型からの転写によって形成する方法を取るため、精度良く製作できると共に同一品質のものが量産的に生産できるので、非常に高い歩留まりが得られる。
【００７９】
また、本発明の製造方法の下では剥離液やエッチング液などを使用しないので、人体に害を及ぼすことがない。
【図面の簡単な説明】
【図１】本発明の第１の実施形態に係わる時計用文字板の要部拡大断面図である。
【図２】図１に示す時計用文字板の下面側から見た要部拡大斜視図である。
【図３】図１に示す時計用文字板の一製造方法を説明する工程説明図で、図３（ａ）は射出成形方法で形成した透過性基板のブランク図、図３（ｂ）は非透過膜を形成した図、図３（ｃ）は凸部の上面を研磨して非透過膜を除去して平滑面に仕上げた図である。
【図４】図１に示す時計用文字板の他の製造方法を示す説明図である。
【図５】本発明の第２の実施形態に係わる時計用文字板の要部拡大断面図である。
【図６】図５に示す時計用文字板の下面側から見た要部断面拡大斜視図である。
【図７】図５に示す時計用文字板の製造方法を説明する工程説明図で、図７（ａ）は射出成形方法で形成した透過性基板のブランク図、図７（ｂ）は透過性カラー装飾膜を形成した図、図７（ｃ）は非透過膜を形成した図、図７（ｄ）は凸部の上面を研磨して透過性カラー装飾膜と非透過膜を除去して平滑面に仕上げた図である。
【図８】本発明の第３の実施形態に係わる時計用文字板の要部拡大断面図である。
【図９】図８に示す時計用文字板の製造方法を説明する工程説明図で、図９（ａ）は射出成形方法で形成した透過性基板のブランク図、図９（ｂ）は非透過膜を形成した図、図９（ｃ）は凸部の上面を研磨して非透過膜を除去して平滑面に仕上げた図、図（ｄ）は透明保護膜を形成して平滑面に仕上げた図である。
【図１０】従来の時計用文字板の要部拡大断面図である。
【図１１】時計用ソーラセルの正面図である。
【図１２】図１０に示す時計用文字板の製造方法を説明する工程説明図であ。
【符号の説明】
１０、３０、５０時計用文字板
１１、３１、５１透過性基板
１１ａ、３１ａ、５１ａ凸部
１１ａ1、３１ａ1、５１ａ1 上面
１１ｂ、３１ｂ、５１ｂ凹部
１２、３２、５２非透過膜
３３透過性カラー装飾膜
５１ｄ第２の模様
５４透明保護膜
ｈ高さ
ｔ幅[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a timepiece dial for a solar cell and a method for manufacturing the same.
[0002]
[Prior art]
As a technique for making a watch dial for a solar cell appear metallic and making the dark purple color of the solar cell invisible, there is a conventional one shown in FIG. FIG. 10 shows an enlarged cross-sectional view of the main part of the timepiece dial. This timepiece dial is a metal in which a large number of small holes 2a are provided at equal intervals on the lower surface of a transparent substrate 1 made of a transparent plastic plate or the like. The film 2 is formed. And this small hole 2a is formed smaller than 30 micrometers. If the size of the small hole is smaller than 30 μm, the small hole itself is hardly visible, and therefore the solar cell itself disposed under it is not visible at all.
[0003]
As shown in FIG. 11, a solar cell for a watch is generally provided on four surfaces (A1, A2, A3, A4) divided into four equal parts and arranged on the lower surface side of the dial. And the amount of transmitted light from the dial is designed to be radiated equally to the four surfaces. By providing the small holes 2a at equal intervals, transmitted light is radiated equally to each of the solar cells divided into four equal parts. Furthermore, a large number of small holes 2a provided at equal intervals are provided such that the total area of the small holes 2a is within a range of 25 to 50% of the dial plate area. If the total area of the small holes 2a is 25%, a transmittance of 25% can be secured, and a sufficient power generation amount can be obtained. Further, when the total area of the small holes 2a exceeds 50%, the dark purple color of the solar cell becomes strong.
[0004]
The timepiece dial configured as described above is formed by the steps shown in FIG. FIG. 12 is a process explanatory view showing the manufacturing method. FIG. 12A shows a state in which the metal film 2 is formed on the transparent substrate 1 made of a transparent plastic plate or the like, and the metal film 2 is formed by a vapor deposition method. The metal film 2 can be selected from various metals such as aluminum and nickel, and has a thickness that does not transmit light.
[0005]
Next, FIG. 12B shows a state in which a resist film 3 is formed on the upper surface of the metal film 2 formed in FIG. 12A. The resist film 3 is formed by a known method such as printing or painting. The
[0006]
Next, FIG. 12C shows an exposure process, and shows a state in which the negative pattern film 4 is placed on the upper surface side of the resist film 3 and irradiated with ultraviolet rays for exposure. The negative pattern film 4 is a negative pattern film having a printing medium shape corresponding to the metal film 2 having a large number of small holes 2a at equal intervals. The negative pattern film 4 is irradiated with ultraviolet rays from the negative pattern film 4 to form a resist film. 3 is exposed and cured. As a result, the portion corresponding to the small holes 2a of the resist film 3 is soft because it is not irradiated with ultraviolet rays, and the other portions (indicated by arrows in the figure) are irradiated with ultraviolet rays and become cured.
[0007]
Next, FIG. 12D is a view showing a state in which the small holes 3 a are formed in the resist film 3. When the soft portion of the resist film 3 that has not been exposed in FIG. 12C (which corresponds to the portion corresponding to the small hole 2a) is peeled off with a stripping solution, the resist film 3 having the small holes 3a is obtained. The small hole 3 a portion of the resist film 3 corresponds to the small hole 2 a portion of the metal film 2.
[0008]
Next, FIG. 12E is a diagram showing a state in which the metal film 2 exposed in the small hole 3a portion of the resist film 3 is peeled off with an etching solution to form the small hole 2a. A small hole 2a is formed by peeling off the exposed metal film 2 with an etching solution.
[0009]
Next, FIG. 12F is a view showing a state in which the remaining resist film 3 is completely peeled and the metal film 2 is exposed. The metal film 2 in which the small holes 2a are formed appears by peeling off the resist film 3 entirely with a stripping solution. If the metal film 2 of the dial plate is formed in this way, and the surface of the metal film 2 is used on the lower surface side, the dial plate having the structure shown in FIG. 10 is obtained.
[0010]
[Problems to be solved by the invention]
The solar cell timepiece dial formed by such a method has a metallic appearance, and the dark purple color of the solar cell cannot be seen at all. However, the cost is very high due to many manufacturing processes. In addition, since the small holes are very small, the dimensional accuracy and position accuracy are also affected by the thickness of the resist film, the expansion and contraction of the film, and the side etching of the metal film. . Therefore, the yield is low and it is not suitable for mass production. In addition, since an etching solution or a stripping solution is used, it cannot be said to be a physically preferable work.
[0011]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and its purpose is a simple work that can be manufactured at a low cost, can be made with high accuracy, and is a safe work that is not harmful to the body. It is providing the dial for timepieces for solar cells which can be manufactured by, and its manufacturing method.
[0012]
As a means for solving the problem, in the timepiece dial, the invention according to claim 1 is a solar cell and a transmissive substrate disposed on the upper side of the solar cell, on the lower surface of the transmissive substrate. It has a concavo-convex part formed in a pattern, the concave part has a non-permeable film, the upper surface of the convex part is a smooth surface and has transparency,The height of the convex part is at least 10 μm or more,The upper surface of the convex portion has a total area of 20 to 50% with respect to the area of the transparent substrate, and the width of the smooth upper surface is70It is characterized by being thinner than μm.
[0013]
The invention according to claim 2 is a solar cell and a transmissive substrate disposed on the upper side of the solar cell, and has a concavo-convex portion formed in a pattern on the lower surface of the transmissive substrate, and the concave portion Has a laminate of a transparent color decorative film and a non-permeable film, and the upper surface of the convex portion is a smooth surface and has transparency,The height of the convex part is at least 10 μm or more,The upper surface of the convex portion has a total area of 20 to 50% with respect to the area of the transparent substrate, and the width of the smooth upper surface is70It is characterized by being thinner than μm.
[0014]
According to a third aspect of the present invention, the uneven portions formed in the pattern are formed side by side at regular intervals.ingIt is characterized by that.
[0015]
The invention according to claim 4 is characterized in that the pattern of the uneven portion is a stripe pattern, a lattice pattern, a circle pattern, a geometric pattern, or the like.
[0016]
The invention according to claim 5 is characterized in that the non-permeable film is a metal film or a paint film.
[0017]
The invention according to claim 6 is characterized in that the transparent color decorative film is a metal thin film or a paint film.
[0018]
The invention according to claim 7A solar cell and a transmissive substrate disposed on the upper side of the solar cell, having a concavo-convex portion formed in a pattern on a lower surface of the transmissive substrate, the concave portion having a non-permeable film, and the convex portion The upper surface of the portion is smooth and has transparency, and the height of the convex portion is at least 10 μm or more, and the upper surface of the convex portion has a total area of 20 relative to the area of the transmissive substrate. The width of the smooth upper surface is narrower than 100 μm, and a second pattern having an uneven portion is formed on the upper surface of the transparent substrate. The invention according to claim 8 is a solar cell and a transmissive substrate disposed on the upper side of the solar cell, and has a concavo-convex portion formed in a pattern on the lower surface of the transmissive substrate, and the concave portion Has a laminate of a transparent color decorative film and a non-permeable film, the upper surface of the convex part is a smooth surface and has transparency, and the height of the convex part is at least 10 μm or more, The upper surface of the convex portion has a total area of 20 to 50% with respect to the area of the transparent substrate. Further, the width of the smooth upper surface is smaller than 100 μm, and the upper surface of the transparent substrate is uneven. A second pattern having a portion is formed
[0019]
Next, in the manufacturing method of the timepiece dial, the claim9The invention according to the present invention has a pattern of uneven portions arranged at regular intervals on the lower surface by a plastic injection molding method using a mold or a method of heating and pressing a permeable plastic plate, and The width of the upper surface of the convex part is70a step of forming a transparent substrate thinner than μm, a step of forming a non-permeable film on the concavo-convex portion of the transmissive substrate by a vapor deposition method or a coating method, and a non-permeation of the convex portion of the transmissive substrate by a cutting method or a polishing method. While removing the permeable membrane, the upper surface of the convex portion is formed into a smooth surface,The height of the convex part is at least 10 μm or more,And a step of making the total area of the upper surface of the convex portion 20 to 50% with respect to the area of the transparent substrate.
[0020]
Claims10The invention according to the present invention has a pattern of uneven portions arranged at regular intervals on the lower surface by a plastic injection molding method using a mold or a method of heating and pressing a permeable plastic plate, and The width of the upper surface of the convex part is70a step of forming a transparent substrate thinner than μm, a step of forming a transparent color decorative film on the concavo-convex portion of the transparent substrate by a vapor deposition method or a coating method, and the formed transparency to enhance a metallic feeling and a decorative feeling. A step of forming a non-permeable film on the color decorative film by a vapor deposition method or a coating method, and removing the non-permeable film and the transparent color decorative film on the convex portion of the transparent substrate by a cutting method or a polishing method; Forming the upper surface of the convex part into a smooth surface;The height of the convex part is at least 10 μm or more,And a step of making the total area of the upper surface of the convex part 20 to 50% with respect to the area of the transparent substrate.
[0025]
Claims11The invention according to the invention is characterized in that the pattern-shaped uneven portions are formed at regular intervals, and the pattern of the uneven portions is a stripe pattern, a lattice pattern, a circle pattern, a geometric pattern, or the like.
[0026]
Claims12The invention according to claim is characterized in that the non-permeable film is a metal film or a paint film.
[0027]
Claims13The invention according to the above is characterized in that the transparent color decorative film is a metal thin film or a paint film.
[0028]
Claims14The invention according toA second pattern having irregularities on the upper surface is formed by a plastic injection molding method using a mold or a method in which a transparent plastic plate is heated and pressurized, and the pattern is arranged at regular intervals on the lower surface. A step of forming a transmissive substrate having a concavo-convex portion and a width of the upper surface of the convex portion being smaller than 100 μm, and a step of forming a non-permeable film on the concavo-convex portion of the lower surface of the transmissive substrate by a vapor deposition method or a coating method And removing the non-permeable film on the convex portion of the transmissive substrate by a cutting method or a polishing method, forming the upper surface of the convex portion to be a smooth surface, and forming the height of the convex portion on the lower surface to be at least 10 μm or more. And a step of making the total area of the upper surface of the convex part 20 to 50% with respect to the area of the transparent substrate. According to a fifteenth aspect of the present invention, a second pattern having an uneven portion on the upper surface is formed by a plastic injection molding method using a mold or a method in which a transparent plastic plate is heated and pressurized, and the lower surface A step of forming a transparent substrate having a pattern of uneven portions arranged at regular intervals and a width of the upper surface of the convex portion being smaller than 100 μm, and a vapor deposition method or an uneven method on the uneven portion of the lower surface of the transparent substrate. A step of forming a transparent color decorative film by a coating method, a step of forming a non-permeable film by a vapor deposition method or a coating method on the formed transparent color decorative film in order to enhance a metallic feeling and a decorative feeling, and a cutting method Alternatively, the non-permeable film and the transparent color decorative film on the convex portion of the transmissive substrate are removed by a polishing method, the upper surface of the convex portion is formed as a smooth surface, and the height of the convex portion on the lower surface is at least 10 μm. More than formed And a step of making the total area of the upper surface of the convex part 20 to 50% with respect to the area of the transmissive substrate.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a timepiece dial according to a first embodiment of the present invention and a manufacturing method thereof will be described with reference to FIGS. FIG. 1 is an enlarged cross-sectional view of the main part of the timepiece dial, and FIG. 2 is an enlarged perspective view of the main part of the timepiece dial shown in FIG. 3 is a process explanatory view showing one manufacturing method of the timepiece dial shown in FIG. 1, and FIG. 4 is a process explanatory view showing another manufacturing method.
[0030]
In FIG. 1, a dial plate 10 has a transparent substrate 11 having a concave portion 11b and a convex portion 11a formed on the lower surface thereof, and a metal non-permeable film 12 formed on the surface of the concave portion 11b. Further, although the dial plate 10 is omitted in the drawing, indicators such as time letters and marks are formed on the upper surface side of the transparent substrate 11 to complete the finished product.
[0031]
The upper surface 11a1 (corresponding to the lower surface in the drawing) 11a1 of the convex portion 11a is polished to expose the transmissive substrate 11, and further has a smooth surface. Further, the convex portion 11a has a height (h) of at least 10 μm or more, and the upper surface 11a1 has a width (t) of 70 μm or less.
[0032]
FIG. 2 is a perspective view of a main part viewed from the lower surface side of the dial plate 10. The convex portions 11a and the concave portions 11b are arranged in a lattice form at regular intervals, and form a lattice pattern as a whole. In FIG. 2, the upper surface 11a1 of the convex portion 11a is polished to be a smooth surface. The total area of the polished upper surface 11a1 is 20% to 50% of the area on the upper surface side of the transmissive substrate 11.
[0033]
The metal non-transmissive film 12 is a metal vapor-deposited film formed by vapor deposition of metal, and is formed with a thickness that does not transmit light. In particular, the coating film is not limited to metal, and may be a coating film formed to a thickness that does not transmit light by printing or painting.
[0034]
In the dial plate 10 having the above-described configuration, light is not transmitted through the non-transmissive film 12 in the concave portion 11b, but rather a reflection effect appears and the color tone of the non-transmissive film can be seen. Further, light passes through the convex portion 11a and enters a solar cell (not shown) disposed on the lower surface thereof. And since the upper surface 11a1 of the convex part 11a is a smooth surface, it injects without scattering and raises incident efficiency.
[0035]
Furthermore, although light is transmitted from the convex portion 11a, the deep purple color of the solar cell is hardly visible because the upper surface 11a1 has a very narrow width. Under the slightly colored substrate, if the width of the upper surface 11a1 is 70 μm or less, the dark purple color of the solar cell is hardly confirmed. In particular, when the thickness is 30 μm or less, even a transparent substrate is not visually recognized at all.
[0036]
Further, the concave portion 11b and the convex portion 11a are formed side by side on the lower surface side, and the total area of the upper surface 11a1 of the convex portion 11a is formed within a range of 20 to 50% of the area of the upper surface side of the dial plate 10. Therefore, it is possible to give a sufficient amount of light for solar cell power generation. In recent solar cells, a solar cell having a sufficient power generation amount with a transmittance of about 20% has appeared. Therefore, if the total area of the upper surface 11a1, which is a transmissive portion, is 20% of the area on the upper surface side, a transmittance of 20% is obtained, and a light quantity that does not hinder power generation is obtained. Further, when the total area of the upper surface 11a1, which is a transmissive portion, exceeds 50% of the area on the upper surface side, the non-permeable film becomes inconspicuous and the dark purple color of the solar cell becomes conspicuous. For this reason, a sufficient amount of power generation is obtained by keeping the total area of the upper surface 11a1, which is a transmissive portion, within a range of 20 to 50%, and the non-permeable film is large and the transmissive portion of the convex portion 11a is not noticeable at all.
[0037]
In this embodiment, the concavo-convex pattern is formed in a lattice pattern, but various patterns such as a stripe pattern, a circle pattern, an Asahikari pattern, and a geometric pattern can be selected in the same manner.
[0038]
Next, a manufacturing method of the dial plate 10 having the above configuration will be described with reference to FIGS. FIG. 3 is a process explanatory view showing the manufacturing process of one manufacturing method, and all are shown in cross-sectional views. First, FIG. 3A shows a blank 11A of a transmissive substrate 11 having a concave portion 11b and a convex portion 11a on the lower surface formed by an injection molding method. The blank 11A is molded by injecting a permeable resin into a mold using an injection molding apparatus under heating and pressurization. The concavo-convex portion on the lower surface is formed by transfer from the concavo-convex portion formed on the mold.
[0039]
Next, FIG.3 (b) is the figure which formed the non-permeable film 12 which consists of a metal vapor deposition film in the whole lower surface with an uneven | corrugated | grooved part. A metal vapor deposition is performed on the entire lower surface of the plank 11A of the transparent substrate 11 formed by the injection molding method by a vapor deposition apparatus to form a non-permeable film 12 of a metal vapor deposition film. This metal vapor deposition film is formed to a thickness (approximately 1000 mm or more) that does not transmit light. The non-transmissive film 12 may be a paint film formed to a thickness that does not allow light to pass through the coating method.
[0040]
FIG. 3C is a view showing a state where the upper surface of the convex portion 11a is polished to remove the non-permeable film 12 and finished to a smooth upper surface 11a1. The upper surface side of the convex portion 11a on which the non-permeable film 12 is formed by the polishing apparatus is polished to such an extent that the transparent substrate is exposed, and the non-permeable film 12 is removed and finished to a smooth upper surface 11a1. In this embodiment, a smooth surface is finished by a polishing method, but a smooth surface may be finished by a cutting method using a diamond tool or the like.
[0041]
The dial 10 is obtained by the above manufacturing method. In the above example, a mold is used to obtain a transmissive substrate having irregularities on one side, and an injection molding method is used. Another method is shown in FIG. 4 shows that when a transparent plastic plate 21B is placed on a flat mounting table 22 and is pressed from above with a pressing tool 23 having irregularities (23a, 23b) formed thereon, under the basis of heating. The thing of the same shape as the blank 11A of the transmissive board | substrate 11 shown by 3 (a) is obtained.
[0042]
If the above manufacturing method is taken, the pattern-like uneven portion of the transparent substrate is formed by transfer from the pattern-like uneven shape formed on the mold or the pressing tool, so the dimensions and shape are very stable with little variation. Can be formed with high accuracy. Furthermore, a mold or pressing tool having a concavo-convex shape can be used for a long period of time, and since this manufacturing process time can be shortened, it is excellent in mass productivity and the processing cost can be made very low. In addition, since the post-processing is a simple processing method such as vapor deposition processing, coating processing, and polishing processing, the total processing time can be reduced, and the cost can be very low. Furthermore, since a conventionally used stripping solution or etching solution is not used, there is no adverse effect on the body and a healthy work is possible.
[0044]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is an enlarged cross-sectional view of the main part of the timepiece dial according to the second embodiment of the present invention, and FIG. 6 is an enlarged cross-sectional perspective view of the main part of the timepiece dial shown in FIG. FIG. 7 is a process explanatory view showing a manufacturing method of the timepiece dial shown in FIG.
[0045]
In FIG. 5, the dial 30 includes a transparent substrate 31 having concave portions 31b and convex portions 31a formed on the lower surface thereof, a transparent color decorative film 33 provided on the concave portion 31b, and the color decorative film 33 on the transparent decorative substrate 33. The non-permeable membrane 32 is laminated. Although not shown, indicators such as time letters and marks are formed on the upper surface side of the transmissive substrate 31 to complete the finished product.
[0046]
Here, the convex portion 31a has a mountain shape, and its upper surface (lower surface in the drawing) 31a1 is polished to expose the transparent substrate 31 to be a smooth surface. The smooth surface of the upper surface may be formed by a cutting method using a diamond tool. Further, as in the first embodiment, the convex portion 31a has a height (h) of at least 10 μm or more and a width (t) of the upper surface 31a1 of 70 μm or less.
[0047]
Further, as shown in FIG. 6, the convex portions 31a and the concave portions 31b are arranged in a circle at regular intervals to form a circle pattern. Further, the total area of the smooth upper surface 31 a 1 of the convex portion 31 a is formed in a range of 20 to 50% with respect to the area on the upper surface side of the transmissive substrate 31.
[0048]
The permeable color decoration film 33 is a film for color decoration and has transparency. In this embodiment, it is formed of a very thin metal vapor deposition film, but a color coating film having transparency may be used. Select the metal film or paint film of the color you want to decorate.
[0049]
The non-transmissive film 32 is formed of a white paint film in the present embodiment, but may be a metal vapor-deposited film and is formed to a thickness that does not transmit light. In this embodiment, a metal vapor deposition film 33 is used for the transmissive color decorative film 33 and a white paint is used for the non-permeable film 32. This combination is more metallic. In addition, a combination of a metal thin film permeable color decorative film and a paint non-permeable film, or a combination of a paint permeable color decorative film and a metal non-permeable film, gives a metallic feeling and enhances decorativeness. Can do.
[0050]
Next, a method for manufacturing the dial 30 will be described with reference to FIG. FIG. 7A shows a blank 31A of a plastic transparent substrate 31 formed by an injection molding apparatus using a mold. A concave portion 31b and a triangular mountain-shaped convex portion 31a are formed on the lower surface of the blank 31A, both of which are formed by transferring from a mold during injection molding. Note that, as described with reference to FIG. 4 in the first embodiment, the unevenness may be formed by pressing a plastic plate under heating using a pressurizing tool provided with unevenness. Moreover, the recessed part 31b and the convex part 31a are formed in the circle-shaped pattern as demonstrated in FIG.
[0051]
FIG. 7B shows a state in which a very thin metal deposition is performed on the uneven surface of the blank 31 </ b> A to form a transparent color decoration film 33. As described above, the transparent color decorative film 33 may be a transparent color paint film.
[0052]
FIG. 7C shows a state in which a white coating is applied on the transparent color decorative film 33 formed in FIG. 7B to form a non-permeable film 32 of paint. The non-transmissive film 32 here is formed to a thickness that does not transmit light. In the present embodiment, the white paint is applied. However, the present invention is not particularly limited, and another paint or a metal vapor deposition film as described above may be used.
[0053]
FIG. 7D shows a state in which the blank 31A is exposed by polishing with a polishing apparatus to partially remove the peaks of the convex portions 31a, and the upper surface 31a1 of the convex portions 31a is finished to a smooth surface. The width of the upper surface 31a1 is suppressed to 70 μm or less, and the total area of the upper surface 31a1 of the convex portion 31 appearing in a circle shape is suppressed within a range of 20 to 50% with respect to the area of the upper surface of the transparent substrate 31. ing. In the present embodiment, the peak of the convex portion 31a is cut by the polishing method and the upper surface 31a1 of the convex portion 31a is finished to a smooth surface. However, it can be finished to the smooth surface by a cutting method using a diamond tool or the like.
[0054]
The dial 30 shown in FIG. 5 can be obtained through the above work steps. The dial 30 has a very narrow width of 70 μm or less at a portion that transmits light. For this reason, the dark purple of the solar cell disposed on the lower surface side is not visually recognized as dark purple. If the width is 30 μm or less, the transmissive part itself cannot be seen, so that the color of the solar cell cannot be seen at all. Furthermore, it is formed in a circle pattern at uniform intervals and the total area of the light transmitting portion is in the range of 20 to 50% or less, so that a sufficient amount of power can be obtained, and the color decorative film and non-transmitting are also obtained in appearance. The color tone of the film is greatly closed up, and the transmission part is hardly noticeable.
[0055]
Further, when the convex portion is formed in a sloped mountain shape as in the present embodiment, the size of the light transmission portion can be arbitrarily set by polishing. Therefore, it is possible to easily form a width of 30 μm or less which is not visually recognized at all.
[0056]
Next, a timepiece dial according to a third embodiment of the present invention and a manufacturing method thereof will be described with reference to FIGS. FIG. 8 shows an enlarged cross-sectional view of the main part of a timepiece dial according to the third embodiment of the present invention, and FIG. 9 is a process explanatory view for explaining a method of manufacturing the timepiece dial, and an enlarged main part. A cross-sectional view is shown.
[0057]
As shown in FIG. 8, the dial plate 50 has a concave portion 51b and a chevron-shaped convex portion 51a on its lower surface, a transparent substrate 51 having a second pattern 51d on its upper surface, and a lower surface concave portion of the transparent substrate 51. The non-permeable film 52 provided on 51 b and the transparent protective film 54 provided on the second pattern 51 d on the upper surface of the transmissive substrate 51 are provided. In addition, although not shown, indicators such as time letters and marks are formed on the upper surface of the transparent protective film 54 to complete the finished product.
[0058]
The upper surface 51a1 of the mountain-shaped convex portion 51a provided on the lower surface side of the transmissive substrate 51 has been smoothed by being polished by a polishing method or a cutting method, and the substrate of the transmissive substrate 51 is exposed. ing. The height (h) of the convex portion 51a is at least 10 μm or more, and the width (t) of the smooth upper surface 51a1 is at most 100 μm or less.
[0059]
The concave portions 51b and the convex portions 51a provided on the lower surface side of the transparent substrate 51 can be arranged in a circle pattern at regular intervals in the same manner as the dial plate 30 of the second embodiment shown in FIG. ing. Further, the total area of the smooth upper surface 51 a 1 of the convex portion 51 a is formed within a range of 20 to 50% with respect to the area on the upper surface side of the transmissive substrate 51.
[0060]
The non-permeable film 52 formed in the recess 51b forms a metal vapor deposition film in the present embodiment, but this may be a paint film. What is necessary is just to form in the thickness which does not permeate | transmit light.
[0061]
In the present embodiment, the second pattern 51d provided on the upper surface side of the transmissive substrate 51 forms a satin pattern having minute irregularities, but the second pattern 51d includes the Asahi pattern, Various patterns such as various stitch patterns and various geometric patterns can be selected.
[0062]
The transparent protective film 54 provided on the second pattern 51d of the transmissive substrate 51 is provided to protect the second pattern 51d, and a printing method or painting using a paint such as a transparent urethane resin or acrylic resin. It is formed by a method or the like. The upper surface of the transparent protective film 54 is polished to a glossy smooth surface.
[0063]
In the present embodiment, the width of the smooth upper surface 51a1 of the convex portion 51a of the transmissive substrate 51 is formed to be slightly larger than the width of the first embodiment and the second embodiment described above, and is 100 μm or less. Is suppressed. If there is a second pattern with irregularities on the upper surface side of the transparent substrate, the dark purple color of the solar cell is hardly visible even if it has a width of 100 μm. In particular, when the second pattern becomes a fine pattern, the dark purple color is not visible at all.
[0064]
Moreover, since the total area of the smooth upper surface 51a1 of the convex portion 51a of the transmissive substrate 51 is suppressed to a range of 20 to 50% with respect to the area on the upper surface side, a sufficient amount of light necessary for power generation can be obtained. In addition, the color of the non-permeable membrane is noticeable and the dark purple color of the solar cell is hardly visible.
[0065]
In the present embodiment, a dial plate is obtained in which the second pattern formed on the upper surface of the transmissive substrate 51 is visible under the color tone of the non-transmissive film 52 formed on the lower surface recess 51 b of the transmissive substrate 51.
[0066]
Next, a manufacturing method of the dial plate 50 having the above configuration will be described with reference to FIG. FIG. 9A shows a blank 51A of a transmissive substrate 51 having a recess 51b and a chevron-shaped projection 51a on the lower surface formed by an injection molding method and a second pattern 51d made of a satin pattern on the upper surface. Yes. The concave portion 51b on the lower surface and the convex portion 51a in the shape of a mountain and the second pattern 51d on the upper surface are formed by transferring from the mold.
[0067]
Next, FIG. 9B shows a state in which a metal vapor-deposited film is formed by the vapor deposition method on the concavo-convex portion (51b, 51a) surface of the blank 51a, and a non-permeable film 52 of the metal vapor-deposited film is formed. The metal vapor deposition film is formed to a thickness that does not transmit light.
[0068]
Next, FIG. 9C shows a state in which a blank 51A is exposed by scraping a part of the peak of the convex portion 51a by a polishing method or a cutting method, and a smooth upper surface 51a1 is formed on the convex portion 51a.
[0069]
Next, FIG. 9D shows that a transparent protective film 54 is formed on the second pattern 51d on the upper surface of the transparent substrate 51 by a printing method or a coating method, and the upper surface of the transparent protective film 54 is further polished. Thus, it shows a smooth finished surface.
[0070]
By using the manufacturing method described above, the timepiece dial 50 of the present embodiment is obtained. Since the manufacturing method is simple and the number of manufacturing processes is small, it can be manufactured at low cost. In addition, since the smooth upper surface 51a1 of the convex portion 51a, which is a portion that transmits light, is formed by a cutting method or a polishing method, dimensional management becomes very easy, and quality with good dimensional accuracy can be obtained in the width dimension and the like.
[0071]
【The invention's effect】
As described above in detail, in the method for forming a timepiece dial according to the present invention, an uneven portion is formed in a pattern on the lower surface of the transparent substrate by an injection molding method or a stamping method. Then, after forming a non-transmissive film on the surface of the concavo-convex portion, the non-transmissive film of the convex portion is removed by a cutting method or a polishing method to form a smooth convex upper surface through which light is transmitted. And the width | variety of the convex part upper surface which light permeate | transmits is suppressed to the thinness of 100 micrometers or less. Further, the total area of the upper surface of the convex portion is suppressed to a range of 20 to 50% with respect to the area of the upper surface of the substrate.
[0072]
When the second pattern having irregularities is formed on the upper surface of the transmissive substrate, the width of the upper surface of the convex portion of the lower surface through which light is transmitted is suppressed to 100 μm or less. Dark purple is hardly visible. Even when the second pattern is not formed, a dark purple color is hardly confirmed on the basis of a width of 70 μm. In particular, if the substrate is decorated with slight coloring or the like, the dark purple color is hardly visible.
[0073]
Further, the concave and convex portions formed on the lower surface are formed in a pattern in which the concave portions and the convex portions are arranged at regular intervals, and the total area of the upper surface of the convex portions on the lower surface through which light is transmitted is relative to the area of the upper surface of the substrate. Since it is limited to the range of 20 to 50%, a sufficient amount of light necessary for power generation can be ensured. Furthermore, the color of the non-permeable film is conspicuous and the dark purple color of the solar cell is hardly visually recognized.
[0074]
Further, a dial having various color decorations can be obtained by interposing a transmissive color decoration film between the transmissive substrate and the non-permeable film.
[0075]
In addition, when a metal vapor deposition film is selected as the non-permeable film or the permeable color decorative film, a dial having a metallic feeling as a whole can be obtained.
[0076]
In addition, by giving different colors to the transparent color decorative film and the non-permeable film, and by selecting various patterns as the pattern of the concavo-convex parts formed on the lower surface of the transparent substrate, By providing the second pattern on the upper surface of the substrate and selecting various patterns as the second pattern, the color decoration and pattern decoration can be enhanced, and various decoration variations are obtained. be able to.
[0077]
Further, since the manufacturing method is simple and the manufacturing process is small, it can be manufactured at a very low cost.
[0078]
Further, since the pattern-like unevenness is formed by transferring from a mold, it can be manufactured with high accuracy and the same quality can be mass-produced, so that a very high yield can be obtained.
[0079]
Further, since no stripping solution or etching solution is used under the manufacturing method of the present invention, there is no harm to the human body.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of a timepiece dial according to a first embodiment of the present invention.
FIG. 2 is an enlarged perspective view of a main part viewed from the lower surface side of the timepiece dial shown in FIG.
3 is a process explanatory view for explaining a manufacturing method of the timepiece dial shown in FIG. 1. FIG. 3 (a) is a blank view of a transparent substrate formed by an injection molding method, and FIG. FIG. 3C is a diagram in which the permeable membrane is formed, and FIG. 3C is a diagram in which the non-permeable membrane is removed by polishing the upper surface of the convex portion to finish the smooth surface.
4 is an explanatory view showing another manufacturing method of the timepiece dial plate shown in FIG. 1. FIG.
FIG. 5 is an enlarged cross-sectional view of a main part of a timepiece dial according to a second embodiment of the present invention.
6 is an enlarged perspective view of a main part cross section viewed from the lower surface side of the timepiece dial shown in FIG. 5. FIG.
7 is a process explanatory diagram for explaining a method of manufacturing the timepiece dial illustrated in FIG. 5, in which FIG. 7 (a) is a blank diagram of a transparent substrate formed by an injection molding method, and FIG. Fig. 7 (c) shows a non-permeable membrane formed, Fig. 7 (d) shows a smooth surface by polishing the upper surface of the convex portion and removing the transparent color decorative membrane and non-permeable membrane. It is the figure finished on the surface.
FIG. 8 is an enlarged cross-sectional view of a main part of a timepiece dial according to a third embodiment of the present invention.
9 is a process explanatory diagram for explaining a method of manufacturing the timepiece dial illustrated in FIG. 8, in which FIG. 9 (a) is a blank view of a transparent substrate formed by an injection molding method, and FIG. 9 (b) is non-transparent. Fig. 9 (c) shows the film formed, Fig. 9 (c) shows the top surface of the projections polished to remove the non-permeable membrane and finishes it to a smooth surface, and Fig. 9 (d) shows the formation of a transparent protective film and finishes it to a smooth surface. It is a figure.
FIG. 10 is an enlarged cross-sectional view of a main part of a conventional timepiece dial.
FIG. 11 is a front view of a solar cell for a watch.
12 is a process explanatory diagram illustrating a method of manufacturing the timepiece dial illustrated in FIG. 10; FIG.
[Explanation of symbols]
10, 30, 50 Clock dial
11, 31, 51 Transparent substrate
11a, 31a, 51a Convex part
11a1, 31a1, 51a1 top surface
11b, 31b, 51b recess
12, 32, 52 Non-permeable membrane
33 Permeable color decorative membrane
51d second pattern
54 Transparent protective film
h Height
t width

Claims

A solar cell and a transmissive substrate disposed on the upper side of the solar cell, having a concavo-convex portion formed in a pattern on a lower surface of the transmissive substrate, the concave portion having a non-permeable film, and the convex portion The upper surface of the portion is smooth and has transparency, and the height of the convex portion is at least 10 μm or more, and the upper surface of the convex portion has a total area of 20 relative to the area of the transmissive substrate. A timepiece dial having ˜50%, and further characterized in that the width of the smooth upper surface is smaller than 70 μm.

A solar cell and a transmissive substrate disposed on the upper side of the solar cell, wherein the permeable substrate has a concavo-convex portion formed in a pattern on the lower surface of the transmissive substrate, and the transmissive color decorative film and the non-permeable film are formed in the concave portion The upper surface of the convex portion is a smooth surface and has transparency, the height of the convex portion is at least 10 μm or more, and the upper surface of the convex portion has a total area of A timepiece dial having 20 to 50% of the area of the transparent substrate, and further having a width of the smooth upper surface smaller than 70 μm.

3. The timepiece dial according to claim 1, wherein the concavo-convex portions formed in a pattern are formed side by side at regular intervals.

4. The timepiece dial according to claim 1, wherein the pattern of the concavo-convex portion is a stripe pattern, a lattice pattern, a circle pattern, a geometric pattern, or the like.

The timepiece dial according to claim 1, wherein the non-permeable film is a metal film or a paint film.

3. A timepiece dial according to claim 2, wherein the transparent color decorative film is a metal thin film or a paint film.

A solar cell and a transmissive substrate disposed on the upper side of the solar cell, having a concavo-convex portion formed in a pattern on a lower surface of the transmissive substrate, the concave portion having a non-permeable film, and the convex portion The upper surface of the portion is smooth and has transparency, and the height of the convex portion is at least 10 μm or more, and the upper surface of the convex portion has a total area of 20 relative to the area of the transmissive substrate. A timepiece dial having a thickness of ˜50%, a width of the smooth upper surface being smaller than 100 μm, and a second pattern having a concavo-convex portion formed on the upper surface of the transparent substrate.

A solar cell and a transmissive substrate disposed on the upper side of the solar cell, wherein the permeable substrate has a concavo-convex portion formed in a pattern on the lower surface of the transmissive substrate, and the transmissive color decorative film and the non-transmissive film are formed in the concave portion. The upper surface of the convex portion is a smooth surface and has transparency, the height of the convex portion is at least 10 μm or more, and the upper surface of the convex portion has a total area of It has 20 to 50% of the area of the transparent substrate, and the width of the smooth upper surface is smaller than 100 μm. Further, a second pattern having an uneven portion is formed on the upper surface of the transparent substrate. A timepiece dial characterized by that.

By using a mold, a plastic injection molding method or a method in which a permeable plastic plate is heated and pressurized, the bottom surface has pattern-shaped uneven portions arranged at regular intervals, and the width of the top surface of the convex portion. Forming a transparent substrate thinner than 70 μm, forming a non-permeable film on the concavo-convex portion of the transmissive substrate by a vapor deposition method or a coating method, and forming a convex portion of the transmissive substrate by a cutting method or a polishing method. The non-permeable film is removed, the upper surface of the convex portion is formed as a smooth surface, the height of the convex portion is at least 10 μm, and the total area of the upper surface of the convex portion is the area of the transmissive substrate. And 20% to 50% of the manufacturing process of the timepiece dial, characterized by comprising:

By using a mold, a plastic injection molding method or a method in which a permeable plastic plate is heated and pressurized, the bottom surface has pattern-shaped uneven portions arranged at regular intervals, and the width of the top surface of the convex portion. Forming a transparent substrate thinner than 70 μm, forming a transparent color decorative film on the concavo-convex portion of the transparent substrate by a vapor deposition method or a coating method, and forming the transparent substrate in order to enhance a metallic feeling and a decorative feeling. Forming a non-permeable film on the transparent color decorative film by a vapor deposition method or a coating method, and removing the non-permeable film and the transparent color decorative film on the convex portion of the transparent substrate by a cutting method or a polishing method. The upper surface of the convex portion is formed as a smooth surface, the height of the convex portion is at least 10 μm or more, and the total area of the upper surface of the convex portion is 20 to 50% with respect to the area of the transmissive substrate. And the process of making A timepiece dial characterized by having Manufacturing method.

11. The pattern according to claim 9, wherein the uneven portions of the pattern are formed at regular intervals, and the pattern of the uneven portions is a stripe pattern, a lattice pattern, a circle pattern, a geometric pattern, or the like. The manufacturing method of the dial for timepieces as described in any one of.

11. The timepiece dial manufacturing method according to claim 9, wherein the non-permeable film is a metal film or a paint film.

11. The timepiece dial manufacturing method according to claim 10, wherein the transparent color decorative film is a metal thin film or a paint film.

A second pattern having irregularities on the upper surface is formed by a plastic injection molding method using a mold or a method in which a transparent plastic plate is heated and pressurized, and the pattern is arranged at regular intervals on the lower surface. A step of forming a transmissive substrate having a concavo-convex portion and a width of the upper surface of the convex portion being smaller than 100 μm, and a step of forming a non-permeable film on the concavo-convex portion of the lower surface of the transmissive substrate by a vapor deposition method or a coating method And removing the non-permeable film on the convex portion of the transmissive substrate by a cutting method or a polishing method, forming the upper surface of the convex portion to be a smooth surface, and forming the height of the convex portion on the lower surface to be at least 10 μm or more. And a step of making the total area of the upper surface of the convex part 20 to 50% with respect to the area of the transparent substrate.

A second pattern having irregularities on the upper surface is formed by a plastic injection molding method using a mold or a method in which a transparent plastic plate is heated and pressurized, and the pattern is arranged at regular intervals on the lower surface. A step of forming a transparent substrate having a concavo-convex portion and the width of the upper surface of the convex portion being thinner than 100 μm, and forming a transparent color decorative film on the concavo-convex portion of the lower surface of the transmissive substrate by a vapor deposition method or a coating method A step of forming a non-permeable film on the formed transparent color decorative film by a vapor deposition method or a coating method to enhance a metallic feeling and a decorative feeling, and a convexity of the transparent substrate by a cutting method or a polishing method. Removing the non-permeable film and the transparent color decorative film of the part, forming the upper surface of the convex part as a smooth surface, forming the height of the convex part of the lower surface to at least 10 μm, and the convex part Total area of the top surface Has a step of making it 20 to 50% with respect to the area of the transmissive substrate.