JPS649184B2 - - Google Patents
Info
- Publication number
- JPS649184B2 JPS649184B2 JP57229863A JP22986382A JPS649184B2 JP S649184 B2 JPS649184 B2 JP S649184B2 JP 57229863 A JP57229863 A JP 57229863A JP 22986382 A JP22986382 A JP 22986382A JP S649184 B2 JPS649184 B2 JP S649184B2
- Authority
- JP
- Japan
- Prior art keywords
- fresnel lens
- mold
- plate
- synthetic resin
- manufacturing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 229920003002 synthetic resin Polymers 0.000 claims description 11
- 239000000057 synthetic resin Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 229920001169 thermoplastic Polymers 0.000 claims description 8
- 239000004416 thermosoftening plastic Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 description 10
- 239000002184 metal Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005323 electroforming Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00269—Fresnel lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/18—Surface shaping of articles, e.g. embossing; Apparatus therefor by liberation of internal stresses, e.g. plastic memory
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/02—Thermal shrinking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
- B29L2011/005—Fresnel lenses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Overhead Projectors And Projection Screens (AREA)
Description
【発明の詳細な説明】
本発明は、背面投影型スクリーン等に用いられ
るフレネルレンズを製作するための金型の製造方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a mold for manufacturing a Fresnel lens used for a rear projection screen or the like.
背面投影型スクリーンは、スクリーンを明るく
均一に観察できるようにするため、光源からの入
射光を観察位置に収束させる同心円状のフレネル
レンズを設けるのが一般的である。ところでこの
ようなフレネルレンズは、合成樹脂板に直接切削
加工して製作する方法あるいは金型に反転したレ
ンズ面を切削加工し、この金型を用いてレンズ面
を転写して製作する方法が知られている。しかし
ながらこのような切削加工は合成樹脂面あるいは
金属面に行なう場合においても、レンズを構成す
る溝のピツチが最小で0.1mm程度が限度であり、
これより小さいピツチにすることは特別な場合を
除き、切削加工することが不可能であつた。この
ようにピツチを小さくすることは、フレネルレン
ズのモアレ現象を軽減させる見地から望まれてい
るが、この要求に十分に応えられない状況であつ
た。 In order to enable bright and uniform viewing of the screen, rear projection screens are generally provided with concentric Fresnel lenses that converge incident light from a light source onto a viewing position. By the way, it is known that Fresnel lenses like this can be manufactured by directly cutting a synthetic resin plate, or by cutting an inverted lens surface into a mold, and then using this mold to transfer the lens surface. It is being However, even when such cutting is performed on synthetic resin surfaces or metal surfaces, the minimum pitch of the grooves that make up the lens is about 0.1 mm.
It has been impossible to make the pitch smaller than this by cutting, except in special cases. Although reducing the pitch in this manner is desired from the standpoint of reducing the moiré phenomenon of Fresnel lenses, it has not been possible to fully meet this demand.
本発明はこのような状況に鑑み、延伸された熱
可塑性合成樹脂の加熱による収縮現象を巧みに利
用してフレネルレンズ製作用の金型を簡便に製造
しようとするものである。すなわち本発明の要旨
とするところは、縦方向と横方向の延伸倍率が等
しくなるように二軸延伸して製作された熱可塑性
合成樹脂板に、フレネルレンズを切削してレンズ
面を形成し、しかるのちこの熱可塑性合成樹脂板
を加熱処理して所定のフレネルレンズを形成し、
得られたフレネルレンズ面を転写して金型を製造
することを特徴とするフレネルレンズ用金型の製
造方法にある。 In view of this situation, the present invention attempts to easily manufacture a mold for producing a Fresnel lens by skillfully utilizing the contraction phenomenon caused by heating of a stretched thermoplastic synthetic resin. That is, the gist of the present invention is to form a lens surface by cutting a Fresnel lens into a thermoplastic synthetic resin plate produced by biaxially stretching so that the stretching ratios in the vertical and horizontal directions are equal, This thermoplastic synthetic resin plate is then heat treated to form a prescribed Fresnel lens.
A method for manufacturing a mold for a Fresnel lens, characterized in that the mold is manufactured by transferring the obtained Fresnel lens surface.
以下、本発明を実施例の図面に従つて説明す
る。 The present invention will be described below with reference to drawings of embodiments.
第１図Ａ〜Ｆは本発明の製造工程を示す説明図
であり、以下この工程順に説明する。第１図Ａは
熱可塑性合成樹脂板の元板１Ａを示すもので、こ
の材料としてはアクリル樹脂、ポリカーボネート
樹脂、塩化ビニル樹脂等の熱可塑性合成樹脂が用
いられる。第１図Ｂはこの元板１Ａを縦、横等し
い延伸倍率の二軸方向に加熱延伸して製作された
延伸板１Ｂで、このような延伸板１Ｂは、再加熱
すると延伸していた分が収縮しほぼ元の形状に戻
ることが知られている。 FIGS. 1A to 1F are explanatory diagrams showing the manufacturing process of the present invention, and the process will be explained in the following order. FIG. 1A shows a base plate 1A of a thermoplastic synthetic resin plate, and the material used is a thermoplastic synthetic resin such as acrylic resin, polycarbonate resin, or vinyl chloride resin. Fig. 1B shows a stretched plate 1B produced by heating and stretching this original plate 1A in two axial directions with equal stretching ratios in length and width.When such a stretched plate 1B is reheated, the amount of stretching is removed. It is known to shrink and return to its original shape.
第１図Ｃは、上記の如くして製作された延伸板
１Ｂに同心円状のフレネルレンズ面を形成したフ
レネルレンズ板１Ｃを示している。このようなフ
レネルレンズ面の形成は、切削加工によつて行な
われるが、一般のフレネルレンズを製作する場合
と同様に行なうことができる。第１図Ｄは上記の
フレネルレンズ板１Ｃを加熱処理して得たフレネ
ルレンズ板１Ｄを示している。このように再度加
熱すると、延伸された部分のフレネルレンズ面は
収縮されることとなる。 FIG. 1C shows a Fresnel lens plate 1C in which a concentric Fresnel lens surface is formed on the stretched plate 1B produced as described above. Formation of such a Fresnel lens surface is performed by cutting, but it can be performed in the same manner as when manufacturing a general Fresnel lens. FIG. 1D shows a Fresnel lens plate 1D obtained by heat-treating the Fresnel lens plate 1C described above. When heated again in this manner, the stretched portion of the Fresnel lens surface is contracted.
第１図Ｅ，Ｆは、上記のようにして得られたフ
レネルレンズ板１Ｄを一種の母型として用いて金
型を製作する工程を説明しており、Ｅではまずフ
レネルレンズ面に銀等の金属蒸着膜２を形成した
状態を示している。そしてこのように金属蒸着膜
２を導体として電気メツキして厚肉化し、これを
フレネルレンズ板１Ｄより取り外し、基材に接合
する等して第１図Ｆの如き金型Ｍを得る。この金
型Ｍの製作は、所謂電鋳法と称される方法である
が、これ以外に低融金属をフレネルレンズ面に流
し込んで固化させたのち取り外し、レンズ面に金
属メツキを施す方法も採用することができる。 Figures E and F explain the process of manufacturing a mold using the Fresnel lens plate 1D obtained as described above as a kind of matrix. A state in which a metal vapor deposited film 2 is formed is shown. Then, the metal vapor deposited film 2 is electroplated as a conductor to make it thicker, removed from the Fresnel lens plate 1D, and bonded to a base material, etc., to obtain a mold M as shown in FIG. 1F. This mold M is manufactured by a method called electroforming, but another method is also used in which a low-melting metal is poured onto the Fresnel lens surface, solidified, and then removed and the lens surface is plated with metal. can do.
以上の如くして得られた金型Ｍを用いてフレネ
ルレンズを製作する場合には、この金型Ｍによ
り、上記した如きアクリル樹脂等の合成樹脂材料
を用い、加熱プレス法、射出成形法あるいは鋳込
み重合法等の方法により、容易に製作することが
できる。なお本発明においては、母型として用い
るフレネルレンズ板１Ｄの延伸、再加熱による収
縮を利用して製作しているので、縦、横の所定の
焦点距離に応じて延伸倍率を考慮して決定すると
よい。このように一旦切削したフレネルレンズ面
を収縮させることは、レンズのピツチを小さくす
ることになり、モアレ現象防止の見地から有利と
なる。またフレネルレンズを直接切削加工する場
合あるいは金型面を切削加工する場合、往々にし
て切削時に微小な傷が生ずることがあるが、本発
明では切削後に加熱処理するため、このような傷
を無くすかあるいは著しく軽減させることができ
る。 When manufacturing a Fresnel lens using the mold M obtained as described above, the mold M can be used to make a synthetic resin material such as the above-mentioned acrylic resin by hot pressing, injection molding or It can be easily manufactured by a method such as cast polymerization. In addition, in the present invention, since the Fresnel lens plate 1D used as a matrix is manufactured by stretching and shrinking by reheating, it is determined by considering the stretching magnification according to the predetermined vertical and horizontal focal lengths. good. Shrinking the Fresnel lens surface once cut in this manner reduces the pitch of the lens, which is advantageous from the standpoint of preventing moiré phenomena. Furthermore, when directly cutting a Fresnel lens or cutting the mold surface, minute scratches often occur during cutting, but in the present invention, such scratches are eliminated by heat treatment after cutting. or can be significantly reduced.
本発明は以上詳述した如き構成からなるもので
あるから、熱可塑性合成樹脂の性質を巧みに利用
して、ピツチが小さいフレネルレンズ製作用の金
型を簡単に製作することができる利点がある。 Since the present invention has the configuration as detailed above, it has the advantage that a mold for producing a Fresnel lens with a small pitch can be easily manufactured by skillfully utilizing the properties of thermoplastic synthetic resin. .
第１図Ａ〜Ｆは本発明の製造工程の説明図であ
る。
１Ａ……元板、１Ｂ……延伸板、１Ｃ……切削
されたフレネルレンズ板、１Ｄ……収縮されたフ
レネルレンズ板、２……金属蒸着膜、Ｍ……金
型。
FIGS. 1A to 1F are explanatory diagrams of the manufacturing process of the present invention. 1A... Original plate, 1B... Stretched plate, 1C... Cut Fresnel lens plate, 1D... Shrinked Fresnel lens plate, 2... Metal vapor deposited film, M... Mold.
Claims (1)
に二軸延伸して製作された熱可塑性合成樹脂板
に、フレネルレンズを切削してレンズ面を形成
し、しかるのちこの熱可塑性合成樹脂板を加熱処
理して所定のフレネルレンズを形成し、得られた
フレネルレンズ面を転写して金型を製造すること
を特徴とするフレネルレンズ用金型の製造方法。1 A Fresnel lens is cut to form a lens surface on a thermoplastic synthetic resin plate that has been biaxially stretched so that the stretching magnification in the vertical and horizontal directions is equal, and then this thermoplastic synthetic resin plate is 1. A method for manufacturing a mold for a Fresnel lens, comprising forming a predetermined Fresnel lens through heat treatment, and manufacturing a mold by transferring the obtained Fresnel lens surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57229863A JPS59123628A (en) | 1982-12-29 | 1982-12-29 | Manufacture of mold for fresnel lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57229863A JPS59123628A (en) | 1982-12-29 | 1982-12-29 | Manufacture of mold for fresnel lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59123628A JPS59123628A (en) | 1984-07-17 |
| JPS649184B2 true JPS649184B2 (en) | 1989-02-16 |
Family
ID=16898872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57229863A Granted JPS59123628A (en) | 1982-12-29 | 1982-12-29 | Manufacture of mold for fresnel lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59123628A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3925696B2 (en) * | 2001-11-05 | 2007-06-06 | コニカミノルタホールディングス株式会社 | Mold production method |
| KR101971745B1 (en) | 2011-02-02 | 2019-04-23 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Nozzle and method of making same |
| JP7341671B2 (en) * | 2018-03-05 | 2023-09-11 | キヤノン株式会社 | Articles and methods of manufacturing articles |
-
1982
- 1982-12-29 JP JP57229863A patent/JPS59123628A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59123628A (en) | 1984-07-17 |
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