JPS5814816A - Optical system of color video camera - Google Patents
Optical system of color video cameraInfo
- Publication number
- JPS5814816A JPS5814816A JP56114074A JP11407481A JPS5814816A JP S5814816 A JPS5814816 A JP S5814816A JP 56114074 A JP56114074 A JP 56114074A JP 11407481 A JP11407481 A JP 11407481A JP S5814816 A JPS5814816 A JP S5814816A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- semi
- video camera
- pass filter
- component
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光学系の一部に半透過鏡と複屈折性のローパス
フィルターを用いた、周波数分離方式の従来この種のビ
デオカメラにおいては、７アイム
ンダー光束取出しに用いる半透過鏡の反射面法線と撮影
光学系の光軸を含む平面が撮像管の水平走査方向と同一
方向又は直角方向に向くように配置されていた。すなわ
ち、ビデオカメラの真上又は真横にファインダー系を配
置していた。半透過鏡はその半透過膜が金属膜若しくは
非金属膜であってもＰ成分とＳ成分の夫々の偏光成分に
応じて透過比率が異なる。一方、複屈折板は光線の振動
方向により入射光線を常光線と異常光１ｓＫ分離して射
出する性質がらり、ビデオカメラはこの性質を利用して
ローパスフィルターとして用いている。DETAILED DESCRIPTION OF THE INVENTION The present invention uses a semi-transmissive mirror and a birefringent low-pass filter as a part of the optical system in a conventional video camera of this type using a frequency separation method. The plane including the normal line of the reflecting surface of the transmitting mirror and the optical axis of the photographing optical system was arranged so as to face in the same direction or at right angles to the horizontal scanning direction of the image pickup tube. That is, the finder system was placed directly above or next to the video camera. Even if the semi-transparent film is a metal film or a non-metal film, the transmission ratio of the semi-transparent mirror differs depending on the polarization components of the P component and the S component. On the other hand, a birefringent plate has a property of separating an incident light beam into an ordinary light beam and an extraordinary light beam by 1 sK depending on the direction of vibration of the light beam, and emitting the same, and video cameras use this property as a low-pass filter.
従って複屈折板へ入射する光のＰ成分とＳ成分の比率が
異なっていると射出光の常光線と異常光線の透過比率が
異なってくるので複屈折板のローパスフィルターとして
の性能が充分発揮できなくなってくる。Therefore, if the ratio of the P component and the S component of the light incident on the birefringent plate is different, the transmission ratio of the ordinary ray and the extraordinary ray of the emitted light will be different, so the birefringent plate cannot fully demonstrate its performance as a low-pass filter. It's going to disappear.
このような欠点を解決する手段として、特公昭５４−９
４９９では複屈折板の前方部に補正板を挿入する方法の
提案がなされている。しかしながら、新たに光学部材を
挿入することはその軸合せ調整が必要となり、又光学系
全体の透過率が減少する原因となるのであまり好ましい
とは言えない。As a means to solve these shortcomings,
No. 499 proposes a method of inserting a correction plate in the front part of the birefringent plate. However, inserting a new optical member requires adjustment of its axis alignment and causes a decrease in the transmittance of the entire optical system, which is not very desirable.
本発明は光学系の一部に半透過鏡を用いたときに、Ｐ成
分とＳ成分の透過比率の不均衡による複屈折板のローパ
スフィルターとしての性能低下を防止し、被写体の空間
周波数と色搬送周波数の混同に基く偽色信号を除去した
ビデオカメラの光学系の提供を目的とする。The present invention prevents a birefringent plate from deteriorating its performance as a low-pass filter due to an imbalance in the transmission ratio of the P component and S component when a semi-transmissive mirror is used as part of the optical system, and improves the spatial frequency and color of the subject. The object of the present invention is to provide an optical system for a video camera that eliminates false color signals based on carrier frequency confusion.
本発明の目的を達成するための構成の特徴は、半透過鏡
の軸上光反射法線と光学系の光軸とからなる平面を撮像
管の水平走査方向と略（４５＋９Ｏｎ）度（但しｎ −
０，１，２，３）方向に配置したことである。The feature of the configuration for achieving the object of the present invention is that the plane consisting of the axial light reflection normal of the semi-transmissive mirror and the optical axis of the optical system is aligned with the horizontal scanning direction of the image pickup tube by approximately (45+9On) degrees (however, n −
0, 1, 2, 3) direction.
以下、本発明の実施例を各図を用いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
第１図は、従来のビデオカメ２における半透過鏡゛１と
複屈折板２との光学配置を示す説明図である。１＆は半
透過面である。半透過鏡を透過した光は半透過面１ａの
垂直断面方向又は水平断面方向のいずれの方向にファイ
ンダー光束を取り出す方法をとってもＰ成分とＳ成分の
透過比率は異なってくる。従って、複屈折板２を透過し
た光は常光線４と異常光線５の透過比率が異なってくる
ために光学的ローパスフィルターとしての性能が充分発
揮できなくなってくる。FIG. 1 is an explanatory diagram showing the optical arrangement of a semi-transmissive mirror 1 and a birefringent plate 2 in a conventional video camera 2. As shown in FIG. 1& is a semi-transparent surface. The transmission ratio of the P component and the S component of the light transmitted through the semi-transmissive mirror differs regardless of the method of extracting the finder light beam in either the vertical cross-sectional direction or the horizontal cross-sectional direction of the semi-transmissive surface 1a. Therefore, the light transmitted through the birefringent plate 2 has a different transmission ratio between the ordinary ray 4 and the extraordinary ray 5, making it impossible to fully exhibit its performance as an optical low-pass filter.
第２図は本発明の実施例の光学配置を示す説明図でおる
。同図は、半透過鏡１の軸上反射法線と光軸６とからな
る平面を撮像管の水平走査方向と略４５度になるように
第１図の矢印に示す方向に半透過鏡１を回転した配置を
示している。半透過鏡を基準の位置から９０度回転させ
るとＰ成分とＳ成分の透過比率が逆転するから、４５度
回転すればＰ成分とＳ成分が均等になるときがあるのは
容易に理解される。このような状態においては、複屈折
板により分離された常光線４と異常光線５の透過比率は
等しくなるので、複屈折板２はローパスフィルターとし
ての性能を充分発揮するようになる。FIG. 2 is an explanatory diagram showing the optical arrangement of an embodiment of the present invention. In this figure, the semi-transmitting mirror 1 is moved in the direction shown by the arrow in FIG. It shows the rotated arrangement. It is easy to understand that if the semi-transparent mirror is rotated 90 degrees from its standard position, the transmission ratio of the P and S components will be reversed, so if it is rotated 45 degrees, the P and S components may become equal. . In this state, the transmission ratio of the ordinary ray 4 and the extraordinary ray 5 separated by the birefringent plate becomes equal, so that the birefringent plate 2 fully exhibits its performance as a low-pass filter.
本実施例では半透過鏡１を回転させたが、半透過鏡１の
かわりに複屈折板２を同量回転させてもよく、又両者を
互いに回転させても同様な効果が容易に得られる。In this embodiment, the semi-transmissive mirror 1 is rotated, but the birefringent plate 2 may be rotated by the same amount instead of the semi-transmissive mirror 1, or the same effect can be easily obtained by rotating both of them. .
又、半透過鏡１を回転自在にしておき任意の角度に配置
できる調整機構を設けておけば、本発明の目的は更に良
く達成できる。Further, the object of the present invention can be better achieved by making the semi-transparent mirror 1 rotatable and providing an adjustment mechanism that allows it to be placed at any angle.
前記実施例において、被写体からの光束が偏光特性を有
しているときは、偏光特性のない状態にして半透過鏡１
に入射させる必要がある。従って半透過鏡１の前方に補
正板等を挿入する必要があるが、一般的にはこのような
補正板を挿入しなければならない場合は少なく、本実施
例の構成で多くの被写体の撮影が可能である。In the above embodiment, when the light beam from the subject has polarization characteristics, the semi-transmissive mirror 1 is made to have no polarization characteristics.
It is necessary to input it to Therefore, it is necessary to insert a correction plate or the like in front of the semi-transparent mirror 1, but generally there are few cases where it is necessary to insert such a correction plate, and the configuration of this embodiment can be used to photograph many subjects. It is possible.
以上のように本発明の実施例によれば、光学部材を新た
に追加することなく単に半透過鏡１を回転するだけで容
易に性能良好なるローパスフィルターを有した、被写体
の空間周波数と色搬送周波数め混同に基く偽色信号を除
去したビデオカメラの光学系を達成することができる。As described above, according to the embodiment of the present invention, the spatial frequency and color transfer of the object can be easily achieved by simply rotating the semi-transmissive mirror 1 without adding any new optical members. It is possible to achieve an optical system for a video camera that eliminates false color signals based on frequency confusion.
第１図は従来のビデオカメラにおける光学系の一部の説
明図、第２図は本発明の実施例の光学系の一部の説明図
である。
図中、１は半透過鏡、２は複屈折板、３は光軸、４は常
光線、５は異常光線であ゛る。FIG. 1 is an explanatory diagram of a part of an optical system in a conventional video camera, and FIG. 2 is an explanatory diagram of a part of an optical system of an embodiment of the present invention. In the figure, 1 is a semi-transparent mirror, 2 is a birefringent plate, 3 is an optical axis, 4 is an ordinary ray, and 5 is an extraordinary ray.
Claims (1)
数分離方式のカラービデオカメラの光学系において、 前記半透過鏡の軸上光反射法線と前記光学系の光軸とか
らなる平面を撮像管の水平走査方向と略（４５＋９ Ｏ
ｎ）度（但しｎ −０，１，２，り ）方向に配置した
ことを特徴とするカラービデオカメラの光学系。[Claims] In an optical system of a frequency separation type color video camera using a semi-transmissive mirror and a birefringent low-pass filter, an axial light reflection normal of the semi-transmissive mirror and an optical axis of the optical system are provided. The horizontal scanning direction of the image pickup tube is approximately (45+9 O
An optical system for a color video camera, characterized in that the optical system is arranged in the direction of n) degrees (n-0, 1, 2, ri).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56114074A JPS5814816A (en) | 1981-07-20 | 1981-07-20 | Optical system of color video camera |
| US06/693,815 US4580878A (en) | 1981-07-20 | 1985-01-22 | Picture taking optical system for color video camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56114074A JPS5814816A (en) | 1981-07-20 | 1981-07-20 | Optical system of color video camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5814816A true JPS5814816A (en) | 1983-01-27 |
Family
ID=14628389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56114074A Pending JPS5814816A (en) | 1981-07-20 | 1981-07-20 | Optical system of color video camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5814816A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS628952A (en) * | 1985-07-04 | 1987-01-16 | Nitto Electric Ind Co Ltd | Tension regulating mechanism for rolled tape |
| JPS63231414A (en) * | 1987-03-20 | 1988-09-27 | Fuji Photo Optical Co Ltd | Image pickup and photometric optical system |
| US6953022B1 (en) | 2000-05-26 | 2005-10-11 | Yanmar Co., Ltd. | Fuel injection pump |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5614788A (en) * | 1979-07-17 | 1981-02-13 | Matsushita Electric Ind Co Ltd | Optical system of color television camera |
-
1981
- 1981-07-20 JP JP56114074A patent/JPS5814816A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5614788A (en) * | 1979-07-17 | 1981-02-13 | Matsushita Electric Ind Co Ltd | Optical system of color television camera |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS628952A (en) * | 1985-07-04 | 1987-01-16 | Nitto Electric Ind Co Ltd | Tension regulating mechanism for rolled tape |
| JPS63231414A (en) * | 1987-03-20 | 1988-09-27 | Fuji Photo Optical Co Ltd | Image pickup and photometric optical system |
| US6953022B1 (en) | 2000-05-26 | 2005-10-11 | Yanmar Co., Ltd. | Fuel injection pump |
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