JPH07303257A - Method and device for adjusting optical path length of color separation prism - Google Patents
Method and device for adjusting optical path length of color separation prismInfo
- Publication number
- JPH07303257A JPH07303257A JP6113639A JP11363994A JPH07303257A JP H07303257 A JPH07303257 A JP H07303257A JP 6113639 A JP6113639 A JP 6113639A JP 11363994 A JP11363994 A JP 11363994A JP H07303257 A JPH07303257 A JP H07303257A
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- Prior art keywords
- prism
- lens
- camera device
- optical path
- path length
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Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 59
- 238000000926 separation method Methods 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000033764 rhythmic process Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Color Television Image Signal Generators (AREA)
- Optical Elements Other Than Lenses (AREA)
- Mounting And Adjusting Of Optical Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は色分解プリズムの光路長
調整方法および装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical path length adjusting method and apparatus for a color separation prism.
【０００２】[0002]
【従来の技術】図４はビデオカメラ等のカメラに用いる
色分解プリズム１０を示す。第１のプリズム１２の入射
面１２ｂに入光された光は反射面１２ａでＧ光が反射さ
れ、さらに反射面１２ｂで反射されて出射面１２ｃから
出射される。第１のプリズム１２を透過した光は第２の
プリズム１４に入り、反射面１４ａでＢ光が反射されて
出射面１４ｃから出射される。第１のプリズム１２、第
２のプリズム１４を通過した光はＲ光として第３のプリ
ズム１６の出射面１６ｃから出射され、色分解されるこ
とになる。なお、第３のプリズム１６の出射面１６ｃに
はＲフィルターが装着されることがある。2. Description of the Related Art FIG. 4 shows a color separation prism 10 used in a camera such as a video camera. The light incident on the incident surface 12b of the first prism 12 is reflected by the reflecting surface 12a as G light, further reflected by the reflecting surface 12b, and emitted from the emitting surface 12c. The light transmitted through the first prism 12 enters the second prism 14, the B light is reflected by the reflecting surface 14a, and is emitted from the emitting surface 14c. The light that has passed through the first prism 12 and the second prism 14 is emitted as R light from the emission surface 16c of the third prism 16 and is subjected to color separation. An R filter may be attached to the exit surface 16c of the third prism 16.
【０００３】[0003]
【発明が解決しようとする課題】上記の色分解プリズム
１０の各第１、第２、第３のプリズム１２、１４、１６
は各頂角が決められていることから、各光の光路長は幾
何学的に計算して求めることができ、各光の光路長が所
定の長さになるよう組付けられる。従来、上記色分解プ
リズム１０を組み立てるには、各プリズム１２、１４、
１６を所定の大きさのものに形成しておき、このプリズ
ムを基準面を有する治具（図示せず）内に収納して位置
決めし、接着剤を硬化させて固定するようにしている。
もちろん治具は、上記のように幾何学的に計算して求め
られた光路長をもとに制作されており、各プリズムを治
具内に位置決めするだけで所定の光路長となるように設
定されているものである。The first, second and third prisms 12, 14, 16 of the color separation prism 10 described above are used.
Since each apex angle is determined, the optical path length of each light can be geometrically calculated and obtained, and the optical path length of each light is assembled to be a predetermined length. Conventionally, in order to assemble the color separation prism 10, each prism 12, 14,
16 is formed in a predetermined size, the prism is housed and positioned in a jig (not shown) having a reference surface, and the adhesive is cured and fixed.
Of course, the jig is manufactured based on the optical path length calculated geometrically as described above, and it is set so that the predetermined optical path length can be obtained simply by positioning each prism in the jig. It has been done.
【０００４】しかしながら、各プリズム１２、１４、１
６の製造上の制約から、各プリズム１２、１４、１６に
はその大きさにバラツキが生じるのは避けがたい。した
がって治具に各プリズムを組み込んだ際には、その光路
長にも必然的にバラツキが生じる。光路長の多少のバラ
ツキは光学的特性に直接重大な影響を与えるというもの
ではない。従来この光路長のバラツキは、ＣＣＤ等の撮
像素子の位置を調整して吸収していた。しかしながら、
ＣＣＤの位置調整には位置調整装置が必要であり、この
位置調整装置が複雑な構造となるなどの問題点があっ
た。具体的には、ＣＣＤはカメラ本体側に位置するの
で、カメラ本体内での位置調整が厄介となるのである。However, each prism 12, 14, 1
Due to the manufacturing restrictions of No. 6, it is inevitable that the prisms 12, 14, and 16 have variations in size. Therefore, when each prism is incorporated in the jig, the optical path length also inevitably varies. Some variation in optical path length does not directly affect optical characteristics. Conventionally, this variation in optical path length has been absorbed by adjusting the position of an image pickup device such as a CCD. However,
A position adjusting device is required for position adjustment of the CCD, and there is a problem that the position adjusting device has a complicated structure. Specifically, since the CCD is located on the camera body side, position adjustment within the camera body becomes troublesome.
【０００５】そこで、本発明は上記問題点を解決すべく
なされたものであり、その目的とするところは、プリズ
ムの光路長を容易かつ確実に調整することのできる色分
解プリズムの光路長調整方法および装置を提供するにあ
る。Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide an optical path length adjusting method for a color separation prism capable of easily and surely adjusting the optical path length of a prism. And to provide the equipment.
【０００６】[0006]
【課題を解決するための手段】本発明は上記目的を達成
するため次の構成を備える。すなわち、第１のプリズム
と、該第１のプリズムの反射面に直接もしくは所定のエ
アギャップを介して入射面が当接する第２のプリズム
と、該第２のプリズムの反射面に入射面が当接する第３
のプリズムからなる色分解プリズムの光路長の調整方法
において、レンズ装置と、該レンズ装置の後方にレンズ
装置の光軸と直角な基準面を有する基準当接体と、該基
準当接体を囲んで配置され、ＣＣＤ等の撮像素子を有す
る第１、第２、第３のカメラ装置を具備する光路長調整
装置を用い、前記第１のプリズムの入射面を前記基準当
接体の基準面に当接させて仮配置し、該第１のプリズム
に対し、前記第２と第３のプリズムを前記所要の配置で
仮配置すると共に、前記第１のカメラ装置を第１のプリ
ズムの出射面に撮像素子が当接するよう位置させ、前記
第２のカメラ装置を第２のプリズムの出射面に撮像素子
が当接するよう位置させ、前記第３のカメラ装置を第３
のプリズムの出射面に撮像素子が当接するよう位置さ
せ、前記レンズ装置の前方に指標をおいてレンズを移動
させることによって、該指標の像を各撮像素子上に結像
するレンズの位置を計測し、第１のカメラ装置の撮像素
子上に結像するレンズの位置に対する、第２のカメラ装
置の撮像素子上に結像するレンズ位置の位置ずれＸ1 、
および第３のカメラ装置の撮像素子上に結像するレンズ
位置の位置ずれＸ2 を算出し、該位置ずれＸ1 、Ｘ
2 を、プリズムの光路長の換算距離X1、X2に換算し、前
記第２のプリズムを前記換算距離X1分だけレンズの光軸
に沿って移動させ、前記第１のプリズムを第２のプリズ
ムの移動に伴って移動させ、前記第３のプリズムを、前
記換算距離X1、X2の差分だけレンズ光軸に沿って平行移
動させることを特徴としている。The present invention has the following constitution in order to achieve the above object. That is, the first prism, the second prism in contact with the reflecting surface of the first prism directly or through a predetermined air gap, and the incident surface in contact with the reflecting surface of the second prism. Third contact
In the method of adjusting the optical path length of a color separation prism including a prism, a lens device, a reference contact body having a reference surface perpendicular to the optical axis of the lens device behind the lens device, and surrounding the reference contact body. And an optical path length adjusting device having first, second, and third camera devices each having an image pickup device such as a CCD, and the incident surface of the first prism is used as a reference surface of the reference contact body. The second prism and the third prism are temporarily arranged in the required arrangement with respect to the first prism, and the first camera device is arranged on the exit surface of the first prism. The second camera device is positioned such that the image sensor is in contact with the second camera device, and the second camera device is positioned so that the image sensor is in contact with the exit surface of the second prism.
The position of the lens for forming the image of the index on each image sensor is measured by positioning the image sensor on the exit surface of the prism and moving the lens with the index in front of the lens device. Then, the positional shift X 1 of the lens position for forming an image on the image pickup element of the second camera device with respect to the position of the lens for forming an image on the image pickup element of the first camera device,
And the positional shift X 2 of the lens position that forms an image on the image sensor of the third camera device, and the positional shifts X 1 , X
2 is converted into the converted distances X 1 and X 2 of the optical path length of the prism, the second prism is moved by the converted distance X 1 along the optical axis of the lens, and the first prism is moved to the second The third prism is moved along with the movement of the prism, and the third prism is moved in parallel along the optical axis of the lens by the difference between the conversion distances X 1 and X 2 .
【０００７】[0007]
【作用】第１のプリズム１２を経由する結像位置から
の、第２のプリズム１４を経由する結像位置におけるレ
ンズ２７の位置ずれＸ1 、および第３のプリズム１６を
経由する結像位置におけるレンズ２７の位置ずれＸ2 を
算出する。またこの空間的な位置ずれＸ1 、Ｘ2 がプリ
ズムを媒質とした場合の光路長としての換算距離X1、X2
を換算する。自動駆動装置３５を駆動し、Ｘテーブル３
４、すなわち基準ピン４５を右方（光軸方向）に前記換
算距離X1だけ移動させる。次いで自動駆動装置２９を駆
動してＹテーブル２８を移動させ、第１のプリズムを入
射面１２Ｂを基準当接体３２の基準面に沿わせつつ、そ
の反射面１２ａが第２のプリズム１４の入射面に当接す
る位置まで押し込む。これにより第１のプリズム１２と
第２のプリズム１４の光路長が等しくなるように自動的
に調整される。第３のプリズム１６の調整は、第２のＸ
テーブル４０（したがって撮像素子４３）を前記換算距
離X1、X2の差分だけ移動させ、第３のプリズム１６を撮
像素子４３に当接するまで移動させればよい。The positional deviation X 1 of the lens 27 at the image forming position passing through the second prism 14 from the image forming position passing through the first prism 12 and the image forming position passing through the third prism 16 The displacement X 2 of the lens 27 is calculated. Also, the spatial displacements X 1 and X 2 are converted distances X 1 and X 2 as optical path lengths when a prism is used as a medium.
To convert. The automatic drive device 35 is driven to drive the X table 3
4, that is, the reference pin 45 is moved to the right (optical axis direction) by the conversion distance X 1 . Then, the automatic driving device 29 is driven to move the Y table 28, and the reflecting surface 12a of the first prism is incident on the second prism 14 while the incident surface 12B is aligned with the reference surface of the reference contact body 32. Push it in until it touches the surface. As a result, the optical path lengths of the first prism 12 and the second prism 14 are automatically adjusted to be equal. Adjustment of the third prism 16 requires adjustment of the second X
It suffices to move the table 40 (and thus the image pickup element 43) by the difference between the conversion distances X 1 and X 2 and move the third prism 16 until it comes into contact with the image pickup element 43.
【０００８】[0008]
【実施例】以下、本発明の好適な実施例を添付図面に基
づいて詳細に説明する。図１は光路長調整装置２０の平
面図を示す。２２はベースである。２４はレンズ装置で
あり、ベース２２上でＸ方向に移動可能に設けられた移
動台２５上に設けられている。移動台２５はサーボモー
タ、ネジ桿等を有する自動駆動装置２６によって駆動さ
れる。また２７は交換レンズである。レンズ装置２４の
前方側には適当な指標が置かれる。レンズ装置２４（交
換レンズ２７）の基準点からの距離は、図示しないセン
サによって位置信号として出力され、記憶手段により記
憶可能になっている。レンズ装置２４の後方のベース２
２上の位置には、レンズ装置２４の光軸と直角な基準面
を有する基準当接体３２が配置されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a plan view of the optical path length adjusting device 20. 22 is a base. Reference numeral 24 denotes a lens device, which is provided on a moving table 25 which is provided on the base 22 so as to be movable in the X direction. The moving table 25 is driven by an automatic driving device 26 having a servomotor, a screw rod, and the like. 27 is an interchangeable lens. An appropriate index is placed on the front side of the lens device 24. The distance from the reference point of the lens device 24 (interchangeable lens 27) is output as a position signal by a sensor (not shown) and can be stored in the storage means. Base 2 behind the lens device 24
A reference contact body 32 having a reference surface perpendicular to the optical axis of the lens device 24 is arranged at a position above 2.
【０００９】２８はレンズ装置２４の光軸に直角な方向
のＹ方向に移動自在に設けられたＹテーブルである。Ｙ
テーブル２８は自動駆動装置２６と同様の自動駆動装置
２９によって駆動される。３０は第１のカメラ装置であ
り、Ｙテーブル２８上に搭載されている。また第１のカ
メラ装置３０の前端にはＣＣＤ等の撮像素子３１が取り
付けられている。Ｙテーブル２８（したがって第１のカ
メラ３０）の基準点からの距離は、図示しないセンサに
よって位置信号として出力され、記憶手段により記憶可
能になっている。Reference numeral 28 is a Y table movably provided in the Y direction perpendicular to the optical axis of the lens device 24. Y
The table 28 is driven by an automatic drive device 29 similar to the automatic drive device 26. Reference numeral 30 denotes a first camera device, which is mounted on the Y table 28. An image pickup device 31 such as a CCD is attached to the front end of the first camera device 30. The distance from the reference point of the Y table 28 (and therefore the first camera 30) is output as a position signal by a sensor (not shown) and can be stored by the storage means.
【００１０】３４はＸテーブルであり、ベース２２上で
レンズ装置２４の光軸と平行な方向に移動可能に設けら
れている。３５は前記自動駆動装置２６と同様の自動駆
動装置であり、Ｘテーブル３４を駆動する。Ｘテーブル
３４の基準点からの距離は、図示しないセンサによって
位置信号として出力され、記憶手段により記憶可能にな
っている。３７は第２のＹテーブルであり、Ｘテーブル
３４上でＹ方向、すなわちレンズ装置２４の光軸に直角
な方向に移動可能に設けられている。この第２のＹテー
ブル３７は手動にて移動するよう駆動される。第２のＹ
テーブル３７上には第２のカメラ装置３８が搭載されて
いる。第２のカメラ装置３８の前端にはＣＣＤ等の撮像
素子３９が取り付けられている。An X table 34 is movably provided on the base 22 in a direction parallel to the optical axis of the lens device 24. Reference numeral 35 denotes an automatic drive device similar to the automatic drive device 26, which drives the X table 34. The distance from the reference point of the X table 34 is output as a position signal by a sensor (not shown) and can be stored in the storage means. A second Y table 37 is provided so as to be movable on the X table 34 in the Y direction, that is, in the direction perpendicular to the optical axis of the lens device 24. The second Y table 37 is driven to move manually. Second Y
A second camera device 38 is mounted on the table 37. An image pickup device 39 such as a CCD is attached to the front end of the second camera device 38.
【００１１】４０は第２のＸテーブルであり、Ｘテーブ
ル３４上でＸ方向、すなわちレンズ装置２４の光軸に平
行な方向に移動可能に設けられている。この第２のＸテ
ーブル４０は自動駆動装置２６と同様な自動駆動装置４
１によって駆動される。第２のＸテーブル４０上には第
３のカメラ装置４２が搭載されている。第３のカメラ装
置４２の前端にはＣＣＤ等の撮像素子４３が取り付けら
れている。この第２のＸテーブル４０の基準点からの距
離は、図示しないセンサによって位置信号として出力さ
れ、記憶手段により記憶可能になっている。Reference numeral 40 denotes a second X table, which is movably provided on the X table 34 in the X direction, that is, in the direction parallel to the optical axis of the lens device 24. This second X table 40 is an automatic drive device 4 similar to the automatic drive device 26.
Driven by 1. A third camera device 42 is mounted on the second X table 40. An image sensor 43 such as a CCD is attached to the front end of the third camera device 42. The distance from the reference point of the second X table 40 is output as a position signal by a sensor (not shown) and can be stored in the storage means.
【００１２】第１のカメラ装置３０、第２のカメラ装置
３８、第３のカメラ装置４２は基準当接体３２の基準面
に対向して、該基準面を３方から取り囲むように配設さ
れている。４５は基準ピンであり、第２のカメラ装置３
８の前方、かつ第３のカメラ装置４２の前方に位置して
Ｘテーブル３４上に設けられている。なお４６は第１の
カメラ装置３０に設けられたステー４７に支持された押
さえであり、その先端面は基準当接体３２の基準面と面
一になっている。また４８はステー４７の他端に支持さ
れたスプリングであり、後記するように第３のプリズム
を押圧可能になっている。The first camera device 30, the second camera device 38, and the third camera device 42 are arranged so as to face the reference surface of the reference contact body 32 and surround the reference surface from three sides. ing. Reference numeral 45 is a reference pin, and the second camera device 3
8 is provided in front of the third camera device 42 and is provided on the X table 34. Reference numeral 46 is a retainer supported by a stay 47 provided in the first camera device 30, and its tip end surface is flush with the reference surface of the reference contact body 32. Reference numeral 48 is a spring supported by the other end of the stay 47, and can press the third prism as described later.
【００１３】プリズムの位置調整は次のようにしてなさ
れる。まず図２のごとく、第１のプリズム１２、第２の
プリズム１４、第３のプリズム１６を第１のプリズム１
２の入射面１２ｂを基準当接体３２の基準面に当接する
ようにしてＸテーブル３４上に配置し、また第２のプリ
ズム１４、第３のプリズム１６も当接関係を図示のごと
くしてＸテーブル３４上に配置する。この際第１のプリ
ズム１２は若干引っ込め状態、すなわち基準当接体３２
に対して非押し込み状態に設定する。第１のカメラ装置
３０は撮像素子３１面が第１のプリズム１２の出射面１
２ｃに当接するようＹテーブル２８が移動される。押さ
え４６の先端面も第１のプリズム１２の入射面１２ｂに
当接することが理解される。第１のプリズム１２は基準
当接体３２の基準面、押さえ４６先端面により位置決め
される。第２のプリズム１４は入射面が第１のプリズム
１２の反射面１２ａに接するように、かつ反射面１４ａ
が基準ピン４５に当接するよう、第２のＹテーブル３７
を手動操作して第２のプリズム１４の出射面１４ｃを第
２のカメラ装置３８の撮像素子３９で押圧して配置され
る。第３のプリズム１６は入射面が第２のプリズム１４
の反射面１４ａに当接するよう、第３のカメラ装置４２
を移動してその撮像素子４３で押圧して配置する。The position adjustment of the prism is performed as follows. First, as shown in FIG. 2, the first prism 12, the second prism 14, and the third prism 16 are connected to the first prism 1.
The second incident surface 12b is arranged on the X table 34 so as to abut the reference surface of the reference abutting body 32, and the second prism 14 and the third prism 16 are also brought into abutting relationship with each other as shown in the drawing. It is placed on the X table 34. At this time, the first prism 12 is in a slightly retracted state, that is, the reference contact body 32.
Set to the non-pushed state. In the first camera device 30, the surface of the image pickup element 31 is the exit surface 1 of the first prism 12.
The Y table 28 is moved so as to contact the 2c. It is understood that the tip end surface of the retainer 46 also contacts the incident surface 12b of the first prism 12. The first prism 12 is positioned by the reference surface of the reference contact body 32 and the tip end surface of the retainer 46. The second prism 14 has its entrance surface in contact with the reflecting surface 12a of the first prism 12 and has a reflecting surface 14a.
So that the second Y table 37 contacts the reference pin 45.
Is manually operated to press the emission surface 14c of the second prism 14 by the image pickup element 39 of the second camera device 38 to be arranged. The entrance surface of the third prism 16 is the second prism 14
Of the third camera device 42 so as to come into contact with the reflection surface 14a of the
Is moved and pressed by the image sensor 43 to be arranged.
【００１４】上記のように仮設定された際の各Ｙテーブ
ル２８、基準ピン４５の基準位置からの距離が位置信号
として制御部（図示せず）に入力され、記憶手段に記憶
される。第１のプリズム１２はその入射面１２ｂへの入
射位置如何に拘わらず、その光路長は一定である（幾何
学的に）。上記のように仮設定して、レンズ装置２４を
移動して第１のカメラ装置３０の撮像素子３１上に第１
のプリズム１２を経由する光を結像させ、このときのレ
ンズ２７の基準点からの位置を検出し、位置信号として
制御部に入力して記憶手段に記憶する。このとき、各プ
リズム１２、１４、１６の相対的位置関係は正規の位置
にはないので、第２のプリズム１４、第３のプリズム１
６の光路長は正しく設定されておらず、撮像素子３９、
撮像素子４３上には結像しない。そこで、レンズ装置２
４を移動し、第２のカメラ装置３８の撮像素子３９上に
結像する位置のレンズ２７の位置を検出して位置信号と
して制御部に入力して記憶手段に記憶する。同様に第３
のカメラ装置４２の撮像素子４３に結像する位置のレン
ズ２７の位置を検出して位置信号として制御部に入力し
て記憶手段に記憶する。The distances from the reference positions of the Y tables 28 and the reference pins 45, which are temporarily set as described above, are input to a control unit (not shown) as position signals and stored in the storage means. The optical path length of the first prism 12 is constant (geometrically) regardless of the incident position on the incident surface 12b. The temporary setting is performed as described above, and the lens device 24 is moved to move the first image on the image sensor 31 of the first camera device 30.
The light passing through the prism 12 is imaged, the position of the lens 27 from the reference point at this time is detected, and is input to the control unit as a position signal and stored in the storage means. At this time, since the relative positional relationship between the prisms 12, 14, and 16 is not in a regular position, the second prism 14 and the third prism 1
The optical path length of 6 is not set correctly, and the image sensor 39,
No image is formed on the image sensor 43. Therefore, the lens device 2
4 is moved, the position of the lens 27 at the position where an image is formed on the image pickup element 39 of the second camera device 38 is detected and input as a position signal to the control unit and stored in the storage means. Similarly third
The position of the lens 27 at the position where an image is formed on the image sensor 43 of the camera device 42 is detected, and the position signal is input to the control unit and stored in the storage unit.
【００１５】制御部では上記記憶手段に記憶されている
結像位置におけるレンズ位置を呼び出し、第１のプリズ
ム１２を経由する結像位置からの、第２のプリズム１４
を経由する結像位置におけるレンズ２７の位置ずれ
Ｘ1 、および第３のプリズム１６を経由する結像位置に
おけるレンズ２７の位置ずれＸ2 を算出する。またこの
空間的な位置ずれＸ1 、Ｘ2 がプリズムを媒質とした場
合の光路長としての換算距離X1、X2を換算する。The control unit calls the lens position at the image forming position stored in the storage means, and the second prism 14 from the image forming position passing through the first prism 12 is called.
The positional deviation X 1 of the lens 27 at the image forming position passing through and the positional deviation X 2 of the lens 27 at the image forming position passing through the third prism 16 are calculated. Further, the spatial displacements X 1 and X 2 are converted into conversion distances X 1 and X 2 as an optical path length when a prism is used as a medium.
【００１６】図２において、Ｘテーブル３４を第２のプ
リズム１４、第３のプリズム１６を載せたまま右方に移
動し、第１のプリズム１２を押し込むことにより、第２
のプリズム１４、第３のプリズム１６の光路長が長くな
ることがわかる。第１のプリズム１２の光路長は前記し
たように幾何学的に一定である。自動駆動装置３５を駆
動し、Ｘテーブル３４、すなわち基準ピン４５を右方
（光軸方向）に前記換算距離X1だけ移動させる。次いで
自動駆動装置２９を駆動してＹテーブル２８を移動さ
せ、第１のプリズムを入射面１２Ｂを基準当接体３２の
基準面に沿わせつつ、その反射面１２ａが第２のプリズ
ム１４の入射面に当接する位置まで押し込む。これによ
り第１のプリズム１２と第２のプリズム１４の光路長が
等しくなるように自動的に調整される。なお必要に応じ
て、当該位置での第１のプリズム１２、第２のプリズム
１４の結像位置を再度計測して、再補正するようにして
もよい。In FIG. 2, the X table 34 is moved to the right while the second prism 14 and the third prism 16 are placed, and the first prism 12 is pushed in to move the second table.
It can be seen that the optical path lengths of the prism 14 and the third prism 16 become long. The optical path length of the first prism 12 is geometrically constant as described above. The automatic drive device 35 is driven to move the X table 34, that is, the reference pin 45 to the right (optical axis direction) by the conversion distance X 1 . Then, the automatic driving device 29 is driven to move the Y table 28, and the reflecting surface 12a of the first prism is incident on the second prism 14 while the incident surface 12B is aligned with the reference surface of the reference contact body 32. Push it in until it touches the surface. As a result, the optical path lengths of the first prism 12 and the second prism 14 are automatically adjusted to be equal. If necessary, the image forming positions of the first prism 12 and the second prism 14 at the positions may be measured again and corrected again.
【００１７】第３のプリズム１６の調整は、第２のＸテ
ーブル４０（したがって撮像素子４３）を前記換算距離
X1、X2の差分だけ移動させればよい。第２のテーブル４
０を移動させることによって、第３のプリズム１６はス
プリング４３に押圧されて第２のプリズム１４と接触状
態を保ったまま出射面１６ｃが撮像素子４３に当接する
まで移動され、これにより第１のプリズム１２と光路長
が等しくなる位置まで移動されることがわかる。各プリ
ズムの接触面には公知の紫外線によって硬化される接着
剤が塗布されており、紫外線照射によって接着剤を硬化
させることによってプリズムを一体化できる。第２のカ
メラ装置３８、第３のカメラ装置４２を後退させること
によって一体化したプリズムを取り出すことができる。The adjustment of the third prism 16 is performed by setting the second X table 40 (and hence the image pickup device 43) to the converted distance.
You only have to move the difference between X 1 and X 2 . Second table 4
By moving 0, the third prism 16 is pressed by the spring 43 and moved until the emission surface 16c contacts the image pickup element 43 while maintaining the contact state with the second prism 14, whereby the first prism 16 is moved. It can be seen that the prism 12 is moved to a position where the optical path length is equal. The contact surface of each prism is coated with a known adhesive that is cured by ultraviolet rays, and the prism can be integrated by curing the adhesive by irradiating ultraviolet rays. By retracting the second camera device 38 and the third camera device 42, the integrated prism can be taken out.
【００１８】図３は色分解プリズム１０の他の例を示
す。この色分解プリズム１０では第２のプリズム１４が
２回反射式のものとなっている。そして２回目の反射面
で全反射を得るために、第１のプリズム１２との接触面
に所定のエアギャップ１８が確保されるようになってい
る。この色分解プリズム１０の第１のプリズム１２もそ
の入射光の入射位置に拘わらず光路長は一定であるの
で、前記の実施例と同様にして各プリズムの調整が行え
る。FIG. 3 shows another example of the color separation prism 10. In this color separation prism 10, the second prism 14 is of a double reflection type. Then, in order to obtain total reflection on the second reflection surface, a predetermined air gap 18 is secured on the contact surface with the first prism 12. Since the optical path length of the first prism 12 of the color separation prism 10 is constant regardless of the incident position of the incident light, each prism can be adjusted in the same manner as in the above embodiment.
【００１９】前記実施例では、第１、第２、第３のプリ
ズムの光路長を同じくする例について説明したが、設計
上光路長を若干ずらすこともある。このように光路長を
ずらすように調整する場合においても、あらかじめずら
す条件がわかっていることから、上記と同様にして調整
することができる。すなわち、前記換算距離X1、X2にず
らし分だけ上乗せして新たな換算距離に設定し、この換
算距離にしたがって第２あるいは第３のプリズムを移動
させればよいことになる。本発明では、換算距離とは上
記概念を含むものと定義する。In the above-mentioned embodiment, an example in which the optical path lengths of the first, second and third prisms are the same has been described, but the optical path lengths may be slightly shifted due to design. Even in the case where the optical path length is adjusted in this way, the adjustment condition can be adjusted in the same manner as above because the conditions for the displacement are known in advance. That is, it is sufficient to add a shift amount to the conversion distances X 1 and X 2 to set a new conversion distance, and move the second or third prism according to the conversion distance. In the present invention, the converted distance is defined to include the above concept.
【００２０】以上本発明につき好適な実施例を挙げて種
々説明したが、本発明はこの実施例に限定されるもので
はなく、発明の精神を逸脱しない範囲内で多くの改変を
施し得るのはもちろんである。Although the present invention has been variously described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.
【００２１】[0021]
【発明の効果】本発明によれば、色分解プリズムの段階
であらかじめ各プリズムの光路長を所定に容易に調整が
できるので、カメラ装置側での撮像素子の位置調整が不
要か、あるいは極めて簡単になるという著効を奏する。According to the present invention, since the optical path length of each prism can be easily adjusted in advance at the stage of the color separation prism, it is unnecessary or extremely simple to adjust the position of the image pickup device on the camera device side. Has a remarkable effect.
【図１】光路長調整装置の平面図である。FIG. 1 is a plan view of an optical path length adjusting device.
【図２】図１の部分拡大図である。FIG. 2 is a partially enlarged view of FIG.
【図３】色分解プリズムの一例を示す説明図である。FIG. 3 is an explanatory diagram showing an example of a color separation prism.
【図４】色分解プリズムの他の例を示す説明図である。FIG. 4 is an explanatory diagram showing another example of a color separation prism.
１０ 色分解プリズム １２ 第１のプリズム １４ 第２のプリズム １６ 第３のプリズム １８ エアギャップ ２０ 光路長調整装置 ２２ ベース ２４ レンズ装置 ２７ 交換レンズ ２８ Ｙテーブル ３０ 第１のカメラ装置 ３１ 撮像素子 ３２ 基準当接体 ３４ Ｘテーブル ３７ 第２のＹテーブル ３８ 第２のカメラ装置 ４０ 第２のＸテーブル ４２ 第３のカメラ装置 ４３ 撮像素子 10 Color Separation Prism 12 1st Prism 14 2nd Prism 16 3rd Prism 18 Air Gap 20 Optical Path Length Adjustment Device 22 Base 24 Lens Device 27 Interchangeable Lens 28 Y Table 30 First Camera Device 31 Image Sensor 32 Reference Standard Contact body 34 X table 37 Second Y table 38 Second camera device 40 Second X table 42 Third camera device 43 Image sensor
Claims (2)
反射面に直接もしくは所定のエアギャップを介して入射
面が当接する第２のプリズムと、該第２のプリズムの反
射面に入射面が当接する第３のプリズムからなる色分解
プリズムの光路長の調整方法において、 レンズ装置と、該レンズ装置の後方にレンズ装置の光軸
と直角な基準面を有する基準当接体と、該基準当接体を
囲んで配置され、ＣＣＤ等の撮像素子を有する第１、第
２、第３のカメラ装置を具備する光路長調整装置を用
い、 前記第１のプリズムの入射面を前記基準当接体の基準面
に当接させて仮配置し、該第１のプリズムに対し、前記
第２と第３のプリズムを前記所要の配置で仮配置すると
共に、前記第１のカメラ装置を第１のプリズムの出射面
に撮像素子が当接するよう位置させ、前記第２のカメラ
装置を第２のプリズムの出射面に撮像素子が当接するよ
う位置させ、前記第３のカメラ装置を第３のプリズムの
出射面に撮像素子が当接するよう位置させ、 前記レンズ装置の前方に指標をおいてレンズを移動させ
ることによって、該指標の像を各撮像素子上に結像する
レンズの位置を計測し、 第１のカメラ装置の撮像素子上に結像するレンズの位置
に対する、第２のカメラ装置の撮像素子上に結像するレ
ンズ位置の位置ずれＸ1 、および第３のカメラ装置の撮
像素子上に結像するレンズ位置の位置ずれＸ2 を算出
し、 該位置ずれＸ1 、Ｘ2 を、プリズムの光路長の換算距離
X1、X2に換算し、 前記第２のプリズムを前記換算距離X1分だけレンズの光
軸に沿って移動させ、前記第１のプリズムを第２のプリ
ズムの移動に伴って移動させ、 前記第３のプリズムを、前記換算距離X1、X2の差分だけ
レンズ光軸に沿って平行移動させることを特徴とする色
分解プリズムの光路長調整方法。1. A first prism, a second prism whose incident surface abuts on the reflecting surface of the first prism directly or through a predetermined air gap, and incident on the reflecting surface of the second prism. A method for adjusting an optical path length of a color separation prism including a third prism whose surfaces are in contact with each other, comprising: a lens device, a reference contact body having a reference surface orthogonal to an optical axis of the lens device behind the lens device, An optical path length adjusting device provided with first, second and third camera devices each having an image pickup device such as a CCD arranged around the reference contact body is used, and an incident surface of the first prism is set to the reference contact surface. The second prism and the third prism are temporarily arranged in the required arrangement with respect to the first prism while being brought into contact with the reference surface of the contact body, and the first camera device is arranged to be the first camera device. Position so that the image sensor contacts the exit surface of the prism The second camera device is positioned so that the image pickup element contacts the exit surface of the second prism, and the third camera device is positioned so that the image pickup element contacts the exit surface of the third prism. By moving the lens with the index in front of the lens device, the position of the lens that forms the image of the index on each image sensor is measured, and the image is formed on the image sensor of the first camera device. The positional deviation X 1 of the lens position imaged on the image pickup element of the second camera device and the positional deviation X 2 of the lens position imaged on the image pickup element of the third camera device with respect to the lens position are calculated. , The positional deviations X 1 and X 2 are converted to the optical path length of the prism.
Converted to X 1 and X 2 , the second prism is moved along the optical axis of the lens by the converted distance X 1 , and the first prism is moved along with the movement of the second prism, A method for adjusting an optical path length of a color separation prism, wherein the third prism is moved in parallel along a lens optical axis by a difference between the converted distances X 1 and X 2 .
な基準面を有する基準当接体と、 前記ベース上に前記レンズ装置の光軸と平行なＸ方向に
移動自在に設けられると共に、調整すべき色分解プリズ
ムの第１のプリズム、第２のプリズム、第３のプリズム
が、所定の当接関係をもって、かつ前記基準当接体の基
準面に第１のプリズムの入射面を当接して載置されるＸ
テーブルと、 前記ベース上に前記レンズ装置の光軸と直角なＹ方向に
移動自在に設けられたＹテーブルと、 該Ｙテーブル上に配設され、前記基準当接体に入射面を
当接させた第１のプリズムの出射面に当接可能なＣＣＤ
等の撮像素子を有する第１のカメラ装置と、 前記Ｘテーブル上に配設され、前記レンズ装置の光軸と
直角な方向に移動可能に設けられた第２のＹテーブル
と、 該第２のＹテーブル上に配設され、前記第１のプリズム
の反射面と直接もしくは所定のエアギャップを介して当
接する入射面を有する前記第２のプリズムの出射面に当
接可能なＣＣＤ等の撮像素子を有する第２のカメラ装置
と、 前記Ｘテーブル上に配設され、前記レンズ装置の光軸と
平行な方向に移動可能に設けられた第２のＸテーブル
と、 該第２のＸテーブル上に配設され、前記第１のプリズ
ム、第２のプリズムの透過光がそのまま通過する前記第
３のプリズムの出射面に当接可能なＣＣＤ等の撮像素子
を有する第３のカメラ装置と、 前記Ｘテーブル上に配設され、前記第２のプリズムの反
射面に当接する基準ピンと、 前記各撮像素子上に結像される際のレンズ位置の位置信
号が入力され、レンズ位置の位置ずれを算出すると共
に、該位置ずれをプリズムの換算距離に換算し、該換算
距離に基づいて前記Ｘテーブル、第２のＸテーブルを移
動させる駆動装置を駆動する制御部とを具備することを
特徴とする色分解プリズムの光路長調整装置。2. A base, a lens device arranged on the base, a reference contact body arranged on the base and having a reference surface perpendicular to the optical axis of the lens device, and on the base. Is movably provided in the X direction parallel to the optical axis of the lens device, and the first prism, the second prism, and the third prism of the color separation prism to be adjusted have a predetermined abutting relationship, X is placed with the entrance surface of the first prism in contact with the reference surface of the reference contact body.
A table, a Y table movably provided on the base in the Y direction perpendicular to the optical axis of the lens device, and an Y-table disposed on the Y table and having an incident surface abutting on the reference abutting body. CCD capable of contacting the exit surface of the first prism
A first camera device having an image pickup device such as the above, a second Y table disposed on the X table and movable in a direction perpendicular to the optical axis of the lens device, and the second Y table. An image pickup device such as a CCD disposed on the Y table and capable of contacting the exit surface of the second prism having an entrance surface that contacts the reflection surface of the first prism directly or through a predetermined air gap. A second camera device having: a second X table disposed on the X table and movable in a direction parallel to the optical axis of the lens device; and on the second X table. A third camera device provided with an image sensor such as a CCD capable of contacting the exit surface of the third prism through which the light transmitted through the first prism and the second prism passes as it is; It is arranged on the table, and the second A reference pin that comes into contact with the reflection surface of the rhythm and a position signal of the lens position when the image is formed on each of the image pickup elements are input, and the position shift of the lens position is calculated, and the position shift is converted into a prism conversion distance. An optical path length adjusting device for a color separation prism, comprising: a controller that drives a drive device that performs conversion and moves the X table and the second X table based on the converted distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11363994A JP3615565B2 (en) | 1994-04-30 | 1994-04-30 | Method and apparatus for adjusting optical path length of color separation prism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11363994A JP3615565B2 (en) | 1994-04-30 | 1994-04-30 | Method and apparatus for adjusting optical path length of color separation prism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07303257A true JPH07303257A (en) | 1995-11-14 |
| JP3615565B2 JP3615565B2 (en) | 2005-02-02 |
Family
ID=14617341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11363994A Expired - Lifetime JP3615565B2 (en) | 1994-04-30 | 1994-04-30 | Method and apparatus for adjusting optical path length of color separation prism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3615565B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100704668B1 (en) * | 2005-11-09 | 2007-04-09 | 삼성전자주식회사 | Manufacturing apparatus and method of optical device |
| CN100416335C (en) * | 2005-08-11 | 2008-09-03 | 三星电子株式会社 | Equipment and method for manufacturing optical device |
| JP2019000339A (en) * | 2017-06-14 | 2019-01-10 | パナソニックＩｐマネジメント株式会社 | Endoscope and camera head |
-
1994
- 1994-04-30 JP JP11363994A patent/JP3615565B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416335C (en) * | 2005-08-11 | 2008-09-03 | 三星电子株式会社 | Equipment and method for manufacturing optical device |
| KR100704668B1 (en) * | 2005-11-09 | 2007-04-09 | 삼성전자주식회사 | Manufacturing apparatus and method of optical device |
| JP2007133374A (en) * | 2005-11-09 | 2007-05-31 | Samsung Electronics Co Ltd | Device and method for manufacturing optical device |
| JP2019000339A (en) * | 2017-06-14 | 2019-01-10 | パナソニックＩｐマネジメント株式会社 | Endoscope and camera head |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3615565B2 (en) | 2005-02-02 |
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