JP3792679B2 - Projector having a projection surface distance measuring device - Google Patents

Projector having a projection surface distance measuring device Download PDF

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JP3792679B2
JP3792679B2 JP2003177916A JP2003177916A JP3792679B2 JP 3792679 B2 JP3792679 B2 JP 3792679B2 JP 2003177916 A JP2003177916 A JP 2003177916A JP 2003177916 A JP2003177916 A JP 2003177916A JP 3792679 B2 JP3792679 B2 JP 3792679B2
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Prior art keywords
projection
projector
projection surface
distance measuring
lens
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JP2005017336A (en
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陽一 田村
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Ｎｅｃビューテクノロジー株式会社
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  • Automatic Focus Adjustment (AREA)
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  • Length Measuring Devices By Optical Means (AREA)
  • Measurement Of Optical Distance (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明はプロジェクタに関し、特にプロジェクタと投射面との距離を測定し自動的に焦点を調整できるプロジェクタに関する。
【０００２】
【従来の技術】
液晶技術やＤＬＰ（デジタルライトプロセッシング）技術の急速な進展に伴うプロジェクタの小型化・高性能化により、画像投射を目的とするプロジェクタの用途も拡大し、家庭内でのディスプレイ型テレビに代わる大型の表示装置としても注目されている。
【０００３】
しかし、プロジェクタはディスプレイ型テレビと違って映像面がスクリーンであったり壁であったりするために、設置の都度投射面に映像が鮮明に結像するよう焦点を調整する必要があった。通常は画面の映像を見ながら手動で焦点の調整を行っているが、手動による調整は煩雑なために自動焦点調整も提案されている。特開平１１−１１９８１８５公報には、投射レンズの焦点調整機構を有し、光源と投射レンズとの間に可動透過反射鏡を設け、焦点調整モードでは可動透過反射鏡を光源と投射レンズとの間に位置させ、スクリーンからの反射光を光源と等価の位置にある受光素子に受光させ受光出力信号によって焦点位置を検出演算して焦点調整機構を制御する液晶プロジェクタ用自動焦点装置が開示されている。
【０００４】
【特許文献１】
特開平１１−１１９８１８５号公報
【０００５】
【発明が解決しようとする課題】
しかし、特開平１１−１１９８１８５号公報で開示された液晶プロジェクタ用自動焦点装置では、可動反射鏡によって光源の明るさが低減するため焦点調整モードの都度可動反射鏡を引き出す必要があるという問題があった。
【０００６】
本発明の目的は、テストパターンを用いて投射面との距離を測定し自動焦点調整を行うための投射面距離測定装置を有するプロジェクタを提供することにある。
【０００７】
【課題を解決するための手段】
本発明の投射面距離測定装置を有するプロジェクタは、
プロジェクタの投影装置と投射面との距離を算定する投射面距離測定装置を有し、算定した距離に従って投影装置の投射レンズの焦点調整部を制御することにより投射面に鮮鋭な画像を投射するプロジェクタであって、投射面距離測定装置は、テストパターン表示装置とデジタルカメラと投射面距離算定部とを備え、テストパターン表示装置の投射口とデジタルカメラのレンズはプロジェクタの照射側の面に設けられおり、テストパターン表示装置は、投射面に対して投射レンズの光軸と平行な方向にポイントを投射し、デジタルカメラは、投射面に投射されたポイントを撮像し、投射面距離算定部は、デジタルカメラで撮像した撮像画面の投射面のポイントの画素位置を解析して、その画素位置から投影装置と投射面との距離を算定して投影装置の投射レンズの焦点調整部を制御する、投射面距離測定装置を有するプロジェクタにおいて、投影装置の投射レンズはプロジェクタの筐体の前面の長手方向の第１の側縁に近い位置に設けられており、テストパターン表示装置は投射レンズと第１の側縁との間に設けられ、デジタルカメラの撮像レンズは第１の側縁とは反対側の第２の側縁に近接して設けられていることを特徴とする。
【０００９】
テストパターン表示装置は点照射を行うポイント型レーザポインタであってもよく、プロジェクタが液晶プロジェクタであってもよく、プロジェクタがＤＭＤ方式プロジェクタであってもよい。
【００１０】
【発明の実施の形態】
次に、本発明の実施の形態について図面を参照して説明する。図１は本発明の実施の形態の投射面距離測定装置を有する液晶プロジェクタの模式的ブロック構成図であり、図２は本発明の実施の形態の投射面距離測定装置を有する液晶プロジェクタの模式的説明図であり、（ａ）は投射状態を示す模式的上面図、（ｂ）は液晶プロジェクタの模式的正面図、（ｃ）はデジタルカメラの撮像画面の模式図である。
【００１１】
ここでは、プロジェクタを画像表示部に液晶表示部を有する液晶プロジェクタとして説明するが、これに限定されるものではなく画像表示部にＤＭＤ（デジタルライトプロセッサ）表示部を有するＤＬＰ（デジタルライトプロセッサ）方式プロジェクタであっても三管式であってもよい。
【００１２】
また、テストパターン表示装置としてレーザポインタを例として説明するが、これに限定されるものではなく、例えば赤外線などの不可視光線の投射装置であり、このポイントを赤外線透過フイルタを通過させて撮像してもよい。
【００１３】
液晶プロジェクタ１０は投射レンズ２１と液晶表示部２２と焦点調整部２３とを有する投影装置２０と、液晶表示部２２の画像を制御する画像制御部２５と、投射面距離測定装置３０と、全体の動作を制御するＣＰＵ６０とを備える。投射面距離測定装置３０は、レーザポインタ４０と、撮像レンズ５１と撮像素子５２を有するデジタルカメラ５０と、撮像素子５２が撮像した画像の画素を解析して投射面７０と投影装置２０の距離を算出する投射面距離算定部５３とを備える。
【００１４】
図２（ａ）に示すようにスクリーンや壁などの投射面７０に映像が投射されるように液晶プロジェクタ１０は配置される。投射面７０と液晶プロジェクタ１０との距離は使用条件によって変化するので投射面７０に鮮鋭な映像を投射するには距離に合わせて投射レンズ２１の焦点を調整する必要がある。
【００１５】
本発明は投影装置２０と投射面７０との距離を正確に把握することを目的としており、以下に説明する投射面距離測定装置３０によりその目的は達成される。
【００１６】
投射面距離測定装置３０では、図２（ｂ）に示すように、投影装置２０の投射レンズ２１の斜め上に近接して１個のポイント型レーザポインタ４０が配置され、投影装置２０の投射レンズ２１を隔ててレーザポインタ４０と離れた水平位置に撮像素子５２を有するデジタルカメラ５０の撮像レンズ５１が配置されている。
【００１７】
ポイント型のレーザポインタ４０から投影装置２０の投射光軸２７と平行に投射されたレーザ光４９は、投射面７０上にポイント８１を結ぶ。図２（ａ）に実線で示す投射面７０ａは第１の位置であり、図２（ａ）に鎖線で示す投射面７０ｂは第１の位置より液晶プロジェクタ１０より離れた第２の位置である。ポイント８１ａ、８１ｂはそれぞれに投射されたポイント８１である。図２（ｃ）は投射面７０ａおよび７０ｂ上のポイント８１ａ、８１ｂをデジタルカメラ５０の撮像素子５２で撮像したときの撮像画面８０を模式的に合成して表示しており、図２（ａ）から判るようにポイント８１ｂはポイント８１ａより撮像画面８０上で右側に寄った画素ライン８２上に表示される。
【００１８】
このように投影装置２０と投射面７０との距離によってポイント８１の表示位置が異なるので、投射面距離算定部５３では撮像画面８０におけるポイント８１の位置をその表示された画素の位置により解析し、画素の位置から所定の計算式によって投影装置２０と投射面７０との距離を算出して画像制御部２５に出力し、画像制御部２５はその距離に基づいて焦点制御部２３を操作して投射面７０に投射された映像を鮮鋭な状態に調整する。
【００１９】
上述のようなレーザポインタ４０のようなテストパターン表示装置と撮像素子５２とを併せ持つプロジェクタ１０において、例えば表示面７０となるスクリーンまでの距離を得る場合、テストパターン表示装置と撮像素子５２との距離は離れていたほうが撮像画面８０から高精度で距離が算定できる。しかしながら、このときテストパターン表示装置が撮像レンズ５１から大きく離れていると、投射面７０となるスクリーンが小さい場合にスクリーンにテストパターンを投射できないという問題がおこる。図３は図２におけるレーザポインタと撮像レンズの位置を反対にしたときの投射面距離測定装置を有する液晶プロジェクタの模式的説明図である。ここでは標準的な巾をもつプロジェクタから６２５ｍｍ（２５インチ）スクリーンに映像を投射した例で示しているが、レーザポインタ４０ａからのレーザ光４９ａは投射面７０上にポイントを結ばない。これを防ぐため、映像投射レンズ２１とレーザポインタ４０との距離を映像投射レンズ２１と撮像レンズ５１との距離より小さく配置することで、テストパターン表示装置と撮像素子の距離を大きく保ちつつ、この問題を解決している。
【００２０】
【発明の効果】
以上説明したように本発明は、小さな投射面であっても投射面と投影装置との距離を正確に算定でき、焦点調整部によって投射レンズの焦点を調整し鮮鋭な映像を投射面に投射することができるという効果がある。
【００２１】
これは、投影装置の投射レンズがプロジェクタの筐体の前面の長手方向の第１の側縁に近い位置に設けられており、テストパターン表示装置が投射レンズと第１の側縁との間に設けられ、デジタルカメラの撮像レンズは第１の側縁とは反対側の第２の側縁に近接して設けられているので、テストパターン表示装置とデジタルカメラの撮像レンズとの間隔を十分に取りながら、小さな投射面にもポイントが投射できるからである。
【図面の簡単な説明】
【図１】本発明の実施の形態の画面距離測定装置を有する液晶プロジェクタの模式図ブロック構成図である。
【図２】本発明の実施の形態の投射面距離測定装置を有する液晶プロジェクタの模式的説明図である。
（ａ）は投射状態を示す模式的上面図である。
（ｂ）は液晶プロジェクタの模式的正面図である。
（ｃ）はデジタルカメラの撮像画面の模式図である。
【図３】図２におけるレーザポインタと撮像レンズの位置を反対にしたときの投射面距離測定装置を有する液晶プロジェクタの模式的説明図である。
【符号の説明】
１０、１０ａ 液晶プロジェクタ
２０ 投影装置
２１、２１ａ 投射レンズ
２２ 液晶表示部
２３ 焦点調整部
２５ 画像制御部
２７ 投射光軸
３０ 投射面距離測定装置
４０、４０ａ レーザポインタ
４９、４９ａ レーザ光
５０ デジタルカメラ
５１、５１ａ 撮像レンズ
５２ 撮像素子
５３ 投射面距離算定部
６０ ＣＰＵ
７０、７０ａ、７０ｂ 投射面
８０ 撮像画面
８１ａ、８１ｂ ポイント
８２ 画素ライン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projector, and more particularly to a projector capable of measuring a distance between a projector and a projection surface and automatically adjusting a focus.
[0002]
[Prior art]
With the rapid development of liquid crystal technology and DLP (digital light processing) technology, the miniaturization and high performance of projectors have expanded the use of projectors for image projection, and large-scale replacements for display-type televisions at home. It is also attracting attention as a display device.
[0003]
However, unlike a display-type television, the image plane is a screen or a wall. Therefore, it is necessary to adjust the focal point so that the image is clearly formed on the projection plane every time the projector is installed. Normally, the focus is manually adjusted while watching the screen image. However, since manual adjustment is complicated, automatic focus adjustment has also been proposed. Japanese Patent Application Laid-Open No. 11-1198185 has a focus adjustment mechanism for a projection lens, and a movable transmissive reflector is provided between the light source and the projection lens. In the focus adjustment mode, the movable transmissive reflector is disposed between the light source and the projection lens. An autofocus device for a liquid crystal projector is disclosed, in which reflected light from a screen is received by a light receiving element at a position equivalent to a light source, a focus position is detected and calculated by a received light output signal, and a focus adjustment mechanism is controlled. .
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 11-1198185
[Problems to be solved by the invention]
However, the autofocus device for a liquid crystal projector disclosed in Japanese Patent Application Laid-Open No. 11-1198185 has a problem that it is necessary to pull out the movable reflector every time the focus adjustment mode is selected because the brightness of the light source is reduced by the movable reflector. It was.
[0006]
An object of the present invention is to provide a projector having a projection plane distance measuring device for measuring a distance from a projection plane using a test pattern and performing automatic focus adjustment.
[0007]
[Means for Solving the Problems]
A projector having the projection surface distance measuring device of the present invention,
A projector that has a projection surface distance measuring device that calculates the distance between the projection device of the projector and the projection surface, and projects a sharp image on the projection surface by controlling the focus adjustment unit of the projection lens of the projection device according to the calculated distance The projection surface distance measuring device includes a test pattern display device, a digital camera, and a projection surface distance calculation unit, and the projection port of the test pattern display device and the lens of the digital camera are provided on the irradiation side surface of the projector. The test pattern display device projects points in the direction parallel to the optical axis of the projection lens with respect to the projection surface, the digital camera images the points projected on the projection surface, and the projection surface distance calculation unit Analyze the pixel position of the point on the projection plane of the imaging screen captured by the digital camera, calculate the distance between the projection device and the projection plane from the pixel position, and Controlling the focus adjustment of the projection lens of the apparatus, in the projector having a projection surface distance measuring device, a projection lens of the projection device is provided at a position closer to the longitudinal direction of the first side edge of the front surface of the projector housing cage, the test pattern display device is provided between the projection lens and the first side edge, the imaging lens of the digital camera Re et al provided the first side edge proximate the second side edge opposite It is characterized by.
[0009]
The test pattern display device may be a point type laser pointer that performs point irradiation, the projector may be a liquid crystal projector, and the projector may be a DMD projector.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram of a liquid crystal projector having a projection plane distance measuring device according to an embodiment of the present invention. FIG. 2 is a schematic block diagram of a liquid crystal projector having a projection plane distance measuring device according to an embodiment of the present invention. It is explanatory drawing, (a) is a typical top view which shows a projection state, (b) is a typical front view of a liquid crystal projector, (c) is a schematic diagram of the imaging screen of a digital camera.
[0011]
Here, the projector is described as a liquid crystal projector having a liquid crystal display unit as an image display unit. However, the present invention is not limited to this, and a DLP (digital light processor) system having a DMD (digital light processor) display unit in the image display unit is not limited thereto. It may be a projector or a three-pipe type.
[0012]
Further, the laser pointer is described as an example of the test pattern display device, but the present invention is not limited to this. For example, the test pattern display device is a projection device for invisible rays such as infrared rays, and this point is imaged through an infrared transmission filter. Also good.
[0013]
The liquid crystal projector 10 includes a projection device 20 having a projection lens 21, a liquid crystal display unit 22, and a focus adjustment unit 23, an image control unit 25 that controls an image of the liquid crystal display unit 22, a projection surface distance measuring device 30, CPU60 which controls operation | movement. The projection surface distance measuring device 30 analyzes the pixels of the image captured by the laser pointer 40, the digital camera 50 including the imaging lens 51 and the imaging device 52, and the image captured by the imaging device 52, and determines the distance between the projection surface 70 and the projection device 20. And a projection surface distance calculation unit 53 to calculate.
[0014]
As shown in FIG. 2A, the liquid crystal projector 10 is arranged so that an image is projected onto a projection surface 70 such as a screen or a wall. Since the distance between the projection surface 70 and the liquid crystal projector 10 varies depending on use conditions, in order to project a sharp image on the projection surface 70, it is necessary to adjust the focus of the projection lens 21 according to the distance.
[0015]
The object of the present invention is to accurately grasp the distance between the projection device 20 and the projection surface 70, and the object is achieved by the projection surface distance measuring device 30 described below.
[0016]
In the projection surface distance measuring device 30, as shown in FIG. 2B, one point type laser pointer 40 is arranged in close proximity to the projection lens 21 of the projection device 20, and the projection lens of the projection device 20. An image pickup lens 51 of a digital camera 50 having an image pickup element 52 is disposed at a horizontal position separated from the laser pointer 40 with a distance 21 therebetween.
[0017]
The laser beam 49 projected from the point-type laser pointer 40 in parallel with the projection optical axis 27 of the projection device 20 connects a point 81 on the projection surface 70. A projection plane 70a indicated by a solid line in FIG. 2A is a first position, and a projection plane 70b indicated by a chain line in FIG. 2A is a second position away from the liquid crystal projector 10 from the first position. . Points 81a and 81b are the points 81 projected on each. FIG. 2 (c) schematically shows an imaging screen 80 when the points 81a and 81b on the projection surfaces 70a and 70b are imaged by the imaging device 52 of the digital camera 50, and is displayed as shown in FIG. 2 (a). As can be seen, the point 81b is displayed on a pixel line 82 that is closer to the right side on the imaging screen 80 than the point 81a.
[0018]
Thus, since the display position of the point 81 differs depending on the distance between the projection device 20 and the projection plane 70, the projection plane distance calculation unit 53 analyzes the position of the point 81 on the imaging screen 80 based on the position of the displayed pixel, The distance between the projection device 20 and the projection plane 70 is calculated from the pixel position by a predetermined calculation formula and output to the image control unit 25. The image control unit 25 operates the focus control unit 23 based on the distance to perform projection. The image projected on the surface 70 is adjusted to a sharp state.
[0019]
In the projector 10 having both the test pattern display device such as the laser pointer 40 and the image sensor 52 as described above, for example, when obtaining the distance to the screen serving as the display surface 70, the distance between the test pattern display device and the image sensor 52. The distance can be calculated from the imaging screen 80 with higher accuracy when the distance is greater. However, if the test pattern display device is far away from the imaging lens 51 at this time, there arises a problem that the test pattern cannot be projected onto the screen when the screen serving as the projection surface 70 is small. FIG. 3 is a schematic explanatory view of a liquid crystal projector having a projection surface distance measuring device when the positions of the laser pointer and the imaging lens in FIG. 2 are reversed. Here, an example in which an image is projected from a projector having a standard width onto a 625 mm (25 inch) screen is shown, but the laser beam 49 a from the laser pointer 40 a does not connect a point on the projection surface 70. In order to prevent this, the distance between the video projection lens 21 and the laser pointer 40 is arranged to be smaller than the distance between the video projection lens 21 and the imaging lens 51, while maintaining the distance between the test pattern display device and the imaging element large. The problem is solved.
[0020]
【The invention's effect】
As described above, the present invention can accurately calculate the distance between the projection surface and the projection device even with a small projection surface, adjust the focus of the projection lens by the focus adjustment unit, and project a sharp image onto the projection surface. There is an effect that can be.
[0021]
This is because the projection lens of the projection device is provided at a position near the first side edge in the longitudinal direction of the front surface of the projector housing, and the test pattern display device is located between the projection lens and the first side edge. Since the imaging lens of the digital camera is provided close to the second side edge opposite to the first side edge, the interval between the test pattern display device and the imaging lens of the digital camera is sufficiently large This is because a point can be projected onto a small projection surface while taking it.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of a liquid crystal projector having a screen distance measuring device according to an embodiment of the present invention.
FIG. 2 is a schematic explanatory diagram of a liquid crystal projector having a projection surface distance measuring device according to an embodiment of the present invention.
(A) is a schematic top view which shows a projection state.
(B) is a schematic front view of a liquid crystal projector.
(C) is a schematic diagram of the imaging screen of a digital camera.
3 is a schematic explanatory diagram of a liquid crystal projector having a projection surface distance measuring device when the positions of a laser pointer and an imaging lens in FIG. 2 are reversed.
[Explanation of symbols]
10, 10a Liquid crystal projector 20 Projection device 21, 21a Projection lens 22 Liquid crystal display unit 23 Focus adjustment unit 25 Image control unit 27 Projection optical axis 30 Projection surface distance measurement device 40, 40a Laser pointer 49, 49a Laser beam 50 Digital camera 51, 51a Imaging lens 52 Imaging element 53 Projection surface distance calculation unit 60 CPU
70, 70a, 70b Projection surface 80 Imaging screen 81a, 81b Point 82 Pixel line

Claims (4)

プロジェクタの投影装置と投射面との距離を算定する投射面距離測定装置を有し、算定した距離に従って前記投影装置の投射レンズの焦点調整部を制御することにより前記投射面に鮮鋭な画像を投射するプロジェクタであって、
前記投射面距離測定装置は、テストパターン表示装置とデジタルカメラと投射面距離算定部とを備え、
前記テストパターン表示装置の投射口と前記デジタルカメラのレンズは前記プロジェクタの照射側の面に設けられおり、
前記テストパターン表示装置は、前記投射面に対して前記投射レンズの光軸と平行な方向にポイントを投射し、
前記デジタルカメラは、前記投射面に投射されたポイントを撮像し、
前記投射面距離算定部は、前記デジタルカメラで撮像した撮像画面の前記投射面のポイントの画素位置を解析して、該画素位置から前記投影装置と前記投射面との距離を算定して前記投影装置の投射レンズの焦点調整部を制御する、投射面距離測定装置を有するプロジェクタにおいて、
前記投影装置の前記投射レンズは前記プロジェクタの筐体の前面の長手方向の第１の側縁に近い位置に設けられており、前記テストパターン表示装置は前記投射レンズと前記第１の側縁との間に設けられ、前記デジタルカメラの前記撮像レンズは前記第１の側縁とは反対側の第２の側縁に近接して設けられていることを特徴とする投射面距離測定装置を有するプロジェクタ。A projection surface distance measuring device that calculates the distance between the projection device of the projector and the projection surface, and projects a sharp image on the projection surface by controlling the focus adjustment unit of the projection lens of the projection device according to the calculated distance. A projector that
The projection surface distance measuring device includes a test pattern display device, a digital camera, and a projection surface distance calculation unit,
The projection port of the test pattern display device and the lens of the digital camera are provided on the irradiation side surface of the projector,
The test pattern display device projects points in a direction parallel to the optical axis of the projection lens with respect to the projection surface,
The digital camera images the point projected on the projection surface,
The projection plane distance calculation unit analyzes a pixel position of a point on the projection plane of an imaging screen captured by the digital camera, calculates a distance between the projection device and the projection plane from the pixel position, and performs the projection. controlling the focus adjustment of the projection lens of the apparatus, in the projector having a projection surface distance measuring device,
The projection lens of the projection device is provided at a position close to the first side edge in the longitudinal direction of the front surface of the projector housing, and the test pattern display device includes the projection lens, the first side edge, provided between the imaging lens of the digital camera projection plane distance measuring apparatus characterized by being et provided near the second side edge opposite to the first side edge Projector. 前記テストパターン表示装置は点照射を行うポイント型レーザポインタである、請求項１に記載の投射面距離測定装置を有するプロジェクタ。The projector having the projection surface distance measuring device according to claim 1, wherein the test pattern display device is a point type laser pointer that performs point irradiation. 前記プロジェクタが液晶プロジェクタである、請求項１または請求項２に記載の投射面距離測定装置を有するプロジェクタ。The projector having a projection surface distance measuring device according to claim 1 or 2 , wherein the projector is a liquid crystal projector. 前記プロジェクタがＤＭＤ方式プロジェクタである、請求項１または請求項２に記載の投射面距離測定装置を有するプロジェクタ。The projector having a projection surface distance measuring device according to claim 1 or 2 , wherein the projector is a DMD projector.
JP2003177916A 2003-06-23 2003-06-23 Projector having a projection surface distance measuring device Expired - Fee Related JP3792679B2 (en)

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