JP2576596Y2 - Light amount adjusting device for TV endoscope - Google Patents
Light amount adjusting device for TV endoscopeInfo
- Publication number
- JP2576596Y2 JP2576596Y2 JP1990006179U JP617990U JP2576596Y2 JP 2576596 Y2 JP2576596 Y2 JP 2576596Y2 JP 1990006179 U JP1990006179 U JP 1990006179U JP 617990 U JP617990 U JP 617990U JP 2576596 Y2 JP2576596 Y2 JP 2576596Y2
- Authority
- JP
- Japan
- Prior art keywords
- endoscope
- light amount
- light
- video signals
- solid
- 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 - Lifetime
Links
Landscapes
- Telescopes (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は,TV内視鏡の光量絞り部材を,固体撮像素子
からのR,G,Bフィールド順次映像信号を用いて,自動的
に設定するTV内視鏡用光量調整装置に関するものであ
る。[Detailed description of the invention] [Industrial application field] In the invention, the light amount diaphragm member of the TV endoscope is automatically set using the R, G, B field sequential video signal from the solid-state imaging device. The present invention relates to a light amount adjusting device for a TV endoscope.
周知の如く,TV内視鏡は,照明系としてライトガイド
ファイバーバンドル,撮像系として対物レンズ及びCCD
の如き固体撮像素子を備え,外部光源よりの照明光をラ
イトガイドファイバーバンドルを通して被写体を照明
し,固体撮像素子よりの映像信号を外部に取り出し,処
理してTVモニタ上に画像表示するようにしたものであ
る。また,かかるTV内視鏡は,被写体との距離等に基づ
き被写体の明るさが変化するために,常に一定の明るさ
の画像表示となるように,被写体の明るさの変化に応じ
てライトガイドファイバーバンドルの入射端と光源との
間に配された光量絞り部材を,上記固体撮像素子から得
られた,R(赤)信号,G(緑)信号,B(青)信号のフィー
ルド順次映像信号に基づき,開閉制御するように構成さ
れている。As is well known, a TV endoscope has a light guide fiber bundle as an illumination system, an objective lens and a CCD as an imaging system.
The solid-state image sensor is illuminated with the illumination light from an external light source through a light guide fiber bundle, the video signal from the solid-state image sensor is taken out, processed, and displayed on a TV monitor. Things. In addition, since the brightness of the subject changes based on the distance from the subject and the like, the TV endoscope uses a light guide according to the change in the brightness of the subject so that an image with a constant brightness is always displayed. A field stop video signal of an R (red) signal, a G (green) signal, and a B (blue) signal obtained from the solid-state image sensor is formed by using a light amount stop member arranged between the incident end of the fiber bundle and the light source. It is configured to perform opening and closing control based on.
しかしながら,上述したようなTV内視鏡用光量調整装
置は,固体撮像素子から得られる,R信号,G信号,B信号の
映像信号間に固体撮像素子の特性による出力信号レベル
の差があり,かつ,フィールド順次方式の映像信号のた
め,フィールド順次方式における1フィールドの遅延が
ある。これらのため,光量絞り部材を制御する映像信号
の変化が大きく,また制御の応答速度が遅いという欠点
があった。However, the above-described light amount adjusting device for a TV endoscope has a difference in output signal level between the R signal, the G signal, and the B signal obtained from the solid-state image sensor due to the characteristics of the solid-state image sensor. In addition, because of the field sequential video signal, there is one field delay in the field sequential system. For these reasons, there are drawbacks that the change of the video signal for controlling the light amount diaphragm member is large and the control response speed is slow.
本考案はこれらの欠点を除去し,被写体の明るさに応
じた適正な光量調整をすることを目的とする。An object of the present invention is to eliminate these drawbacks and to perform appropriate light amount adjustment according to the brightness of a subject.
本考案は,上記の目的を達成するため,TV内視鏡の照
明用ライトガイドファイバーバンドルの入射端と光源と
の間に配された光量絞り部材等の光量調整手段に対し
て,固体撮像素子からの映像信号をもって制御するよう
に構成したTV内視鏡用光量調整装置において,フィール
ド順次方式のTV内視鏡に具備されている,R信号,G信号,B
信号のフィールドメモリ回路の各信号出力を,それぞれ
の信号系においてD/A変換し,R,G,Bそれぞれに所定の重
み付けをし,ループ利得がほぼ一定となるように各信号
を加算し,当該信号により光量絞り部材を制御する等
の,光量調整制御を行うようにしたものである。In order to achieve the above object, the present invention provides a solid-state imaging device for a light amount adjusting means such as a light amount stop member disposed between an incident end of a light guide fiber bundle for illumination of a TV endoscope and a light source. In the light amount adjusting device for a TV endoscope configured to be controlled by the video signal from the TV endoscope, the R signal, the G signal, and the B signal included in the field sequential type TV endoscope are provided.
Each signal output of the signal field memory circuit is D / A-converted in each signal system, R, G, and B are each given a predetermined weight, and each signal is added so that the loop gain becomes substantially constant. Light amount adjustment control such as control of the light amount stop member by the signal is performed.
このように構成したTV内視鏡用光量調整装置は,光量
絞り部材を制御するため等の,すなわち,光量調整制御
のための映像信号のフィールド間の変化が小さくなり,
制御の応答速度を早くすることができると共に,上記R,
G,B各映像信号の重み付けされた割合に応じて,光量調
整制御に対するそれぞれの寄与度の割合をほぼ一定にす
ることができるものである。The light amount adjusting device for a TV endoscope configured as described above has a small change between fields of a video signal for controlling a light amount diaphragm member, that is, for controlling light amount adjustment,
The control response speed can be increased, and the above R,
According to the weighted ratio of each of the G and B video signals, the ratio of each contribution to the light amount adjustment control can be made substantially constant.
以下,本考案によるTV内視鏡用光量調整装置の一実施
例を第1図に示した概略ブロック図に基づき詳細に説明
する。Hereinafter, an embodiment of a light amount adjusting device for a TV endoscope according to the present invention will be described in detail with reference to the schematic block diagram shown in FIG.
第1図にて,AはTV内視鏡,Bは光源装置を示し,上記TV
内視鏡Aは照明系としてのライトガイド用ファイバーバ
ンドル1を備え,撮像系としての対物レンズ2及びCCD
のような固体撮像素子3を備える周知構成のものであ
る。上記光源装置Bは上記ライトガイド用ファイバーバ
ンドル1の入射端1aに対向配置されたキセノンランプ等
の光源4,この光源4とライトガイド用ファイバーバンド
ル1の入射端1aとの間の光路内に配置された光量絞り羽
根5,及びこの光量絞り羽根5を上記光路内に出入制御す
るサーボモータ6,上記光源4の光をR,G,B光とするため
のカラー円板7,及びこのカラー円板7を制御するサーボ
モータ8を有する。上記サーボモータ6の制御として,
固体撮像素子3よりの映像信号を増幅する増幅器9,この
映像増幅器9出力をディジタル信号に変換するA/D変換
器10,A/D変換された出力信号をR,G,Bの各フィールドご
との信号に切換える切換えスイッチ11を介して,それぞ
れ記憶するフィールドメモリ12,13,14,それぞれのフィ
ールドメモリ12,13,14からの出力信号をアナログ信号に
変換するD/A変換器15,16,17,D/A変換器15,16,17からの
R,G,B出力信号に所定の値をそれぞれ重み付けし,それ
ら重み付けされた各信号を加算する加算回路18,加算回
路18からの信号を一方の入力端子より入力される比較回
路19,上記サーボモータ6に連動し,サーボモータ6の
回転位置信号を上記比較回路19の他方の入力端子より入
力する位置検出用ポテンショメータ20,及び比較回路19
から比較信号により上記サーボモータ6を駆動する増幅
器21が設けられている。また映像出力増幅器22が画像出
力用に設けられている。In FIG. 1, A shows a TV endoscope, B shows a light source device,
The endoscope A includes a fiber bundle 1 for a light guide as an illumination system, an objective lens 2 as an imaging system, and a CCD.
It has a well-known configuration including the solid-state imaging device 3 as described above. The light source device B is a light source 4, such as a xenon lamp, disposed opposite to the incident end 1a of the light guide fiber bundle 1, and is disposed in an optical path between the light source 4 and the incident end 1a of the light guide fiber bundle 1. The light amount aperture blade 5 thus set, a servomotor 6 for controlling the light amount aperture blade 5 to enter and exit the optical path, a color disk 7 for converting the light from the light source 4 into R, G, and B light, and a color circle It has a servomotor 8 for controlling the plate 7. As control of the servo motor 6,
An amplifier 9 for amplifying a video signal from the solid-state imaging device 3, an A / D converter 10 for converting an output of the video amplifier 9 into a digital signal, and an A / D converted output signal for each of R, G, and B fields. Via field changeover switches 11, 11, and 14, D / A converters 15, 16, which convert output signals from the respective field memories 12, 13, 14 into analog signals. 17, D / A converter 15,16,17
R, G, and B output signals are each weighted with a predetermined value, and an addition circuit 18 that adds the weighted signals, a comparison circuit 19 that receives a signal from the addition circuit 18 from one input terminal, A position detecting potentiometer 20 for inputting a rotational position signal of the servo motor 6 from the other input terminal of the comparison circuit 19 in conjunction with the motor 6, and a comparison circuit 19
And an amplifier 21 for driving the servo motor 6 according to a comparison signal. A video output amplifier 22 is provided for image output.
以上のように構成されたTV内視鏡用光量調整装置は,
ライトガイド用ファイバーバンドル1からカラー円板7
によりR,G,Bフィールド順次に制御されて出力する光に
対して,固体撮像素子3から出力されるR,G,Bフィール
ド順次の映像信号は,映像増幅器9で増幅された後,A/D
変換器10でディジタル信号に変換され,切換スイッチ11
によりフィールドごとにR,G,Bそれぞれのフィールドメ
モリ12,13,14に記憶される。フィールドメモリ12,13,14
からフィールド毎に読み出されるR,G,Bのディジタル映
像信号は,それぞれのD/A変換器15,16,17により,アナ
ログ信号に変換された後,加算回路18により,R,G,Bそれ
ぞれに所定の重み付けをされて加算される。R,G,Bが加
算された映像信号は比較回路19により,サーボモータ6
の回転位置検出用ポテンショメータ20との差を検出し,
その検出レベルに応じて,絞り羽根5を光路内に出入サ
ーボ制御し,被写体の明るさが一定の明るさになるよう
に照明光量を自動的に位置決めされるものである。The light amount adjusting device for a TV endoscope configured as described above is
Light guide fiber bundle 1 to color disk 7
With respect to light that is controlled and output in the R, G, and B fields in sequence, the video signal in the R, G, and B fields output from the solid-state imaging device 3 is amplified by the video amplifier 9 and then A / A D
The signal is converted into a digital signal by the converter 10 and the changeover switch 11
Are stored in the field memories 12, 13, and 14 for R, G, and B for each field. Field memory 12, 13, 14
R, G, and B digital video signals read out from each of the fields are converted into analog signals by respective D / A converters 15, 16, and 17, and then added by an adder circuit 18 to output R, G, and B signals, respectively. Is given a predetermined weight and added. The video signal to which R, G, and B have been added is compared by the comparison circuit 19 with the servo motor 6.
The difference from the rotational position detection potentiometer 20 is detected.
In accordance with the detection level, the diaphragm blades 5 are servo-controlled to enter and exit the optical path, and the amount of illumination is automatically positioned so that the brightness of the subject becomes constant.
以上述べたところより明らかなように,本考案による
TV内視鏡用光量調整装置は,固体撮像素子から得られる
R,G,Bの映像信号間の固体撮像素子の特性による出力信
号レベルの差をなくし,かつ,フィールド順次方式にお
けるフィールド遅延による映像信号の変化を小さくする
ことにより,光量絞り部材による光量制御の応答速度を
早めることができると共に,上記R,G,B各映像信号の重
み付けされた割合に応じて,光量調整制御に対するそれ
ぞれの寄与度の割合をほぼ一定にすることができるもの
である。As is clear from the above, according to the present invention
Light control device for TV endoscope is obtained from solid-state image sensor
By eliminating the difference in output signal level due to the characteristics of the solid-state image sensor between the R, G, and B video signals, and reducing the change in the video signal due to the field delay in the field sequential method, the amount of light control by the aperture stop member is reduced. The response speed can be increased, and the ratio of each contribution to the light amount adjustment control can be made substantially constant according to the weighted ratio of the R, G, and B video signals.
第1図は,本考案によるTV内視鏡用光量調整装置の一実
施例の概略ブロック図を示す。 1:ライトガイド用ファイバーバンドル,3:固体撮像素子,
4:光源,5:絞り羽根,6:サーボモータ,9:映像増幅器,10:A
/D変換器,11:切換スイッチ,12,13,14:フィールドメモ
リ,15,16,17:D/A変換器,18:加算回路,19:比較回路,20:
位置検出用ポテンショメータ,21:増幅器。FIG. 1 is a schematic block diagram of an embodiment of a light amount adjusting device for a TV endoscope according to the present invention. 1: fiber bundle for light guide, 3: solid-state image sensor,
4: Light source, 5: Aperture blade, 6: Servo motor, 9: Video amplifier, 10: A
/ D converter, 11: changeover switch, 12, 13, 14: field memory, 15, 16, 17: D / A converter, 18: addition circuit, 19: comparison circuit, 20:
Potentiometer for position detection, 21: amplifier.
Claims (2)
ァイバーバンドル及び固体撮像素子を備えたTV内視鏡の
上記ライトガイドファイバーバンドルの入射端に入射さ
れる光量を制御する光量制御手段を含むTV内視鏡用光量
調整装置において,上記固体撮像素子から得られるR,G,
Bフィールド順次の映像信号をそれぞれ記憶するための
フィールドメモリ回路と,これらフィールドメモリ回路
から読み出される映像信号をアナログ信号に変換するそ
れぞれのD/A変換回路と,これらアナログ信号に変換さ
れたR,G,Bの映像信号を各ループ利得がほぼ一定になる
ようそれぞれ所定の重み付けをして加算する加算回路
と,該加算回路により得られた映像信号に基づき,上記
光量制御手段を自動設定する自動レベル設定手段を設け
たことを特徴とするTV内視鏡用光量調整装置。1. A TV endoscope comprising at least a light source and a light amount control means for controlling a light amount incident on an incident end of the light guide fiber bundle of a TV endoscope having a light guide fiber bundle for illumination and a solid-state imaging device. In the light amount adjusting device for an endoscope, R, G,
A field memory circuit for storing video signals in the order of B fields, a D / A conversion circuit for converting video signals read from these field memory circuits into analog signals, and R, An adding circuit for adding the G and B video signals with predetermined weights so that the loop gains become substantially constant; and an automatic circuit for automatically setting the light amount control means based on the video signals obtained by the adding circuits. A light amount adjusting device for a TV endoscope, comprising a level setting means.
ァイバーバンドル及び固体撮像素子を備えたTV内視鏡の
上記ライトガイドファイバーバンドルの入射端と光源と
の間に配置され,上記固体撮像素子から得られる映像信
号に基づき開閉制御される光量絞り部材を含むTV内視鏡
用光量調整装置において,上記固体撮像素子から得られ
るR,G,Bフィールド順次の映像信号をそれぞれ記憶する
ためのフィールドメモリ回路と,これらフィールドメモ
リ回路から読み出される映像信号をアナログ信号に変換
するそれぞれのD/A変換回路と,これらアナログ信号に
変換されたR,G,Bの映像信号を各ループ利得がほぼ一定
になるようそれぞれ所定の重み付けをして加算する加算
回路と,該加算回路により得られた映像信号に基づき,
上記光量絞り部材を自動設定する自動レベル設定手段を
設けたことを特徴とするTV内視鏡用光量調整装置。2. A television endoscope having at least a light source, a light guide fiber bundle for illumination and a solid-state imaging device, and disposed between an incident end of the light guide fiber bundle and a light source, and obtained from the solid-state imaging device. A field memory circuit for storing R, G, and B field sequential video signals obtained from the solid-state imaging device in a TV endoscope light quantity adjustment device including a light quantity stop member that is controlled to open and close based on a video signal received And the respective D / A converters that convert the video signals read from these field memory circuits into analog signals, and the loop gains of the R, G, and B video signals converted to these analog signals become almost constant And a video signal obtained by the addition circuit.
A light amount adjusting device for a TV endoscope, comprising an automatic level setting means for automatically setting the light amount stop member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1990006179U JP2576596Y2 (en) | 1990-01-29 | 1990-01-29 | Light amount adjusting device for TV endoscope |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1990006179U JP2576596Y2 (en) | 1990-01-29 | 1990-01-29 | Light amount adjusting device for TV endoscope |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0398415U JPH0398415U (en) | 1991-10-14 |
JP2576596Y2 true JP2576596Y2 (en) | 1998-07-16 |
Family
ID=31509856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1990006179U Expired - Lifetime JP2576596Y2 (en) | 1990-01-29 | 1990-01-29 | Light amount adjusting device for TV endoscope |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2576596Y2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2963440B1 (en) * | 2010-08-02 | 2013-03-01 | Thales Sa | OPTICAL FUSION MODULAR NIGHT-TIME VISUALIZATION SYSTEM |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2715383B2 (en) * | 1986-11-20 | 1998-02-18 | オリンパス光学工業株式会社 | Endoscope device |
JPS63287813A (en) * | 1987-05-20 | 1988-11-24 | Olympus Optical Co Ltd | Endoscope device |
JPS6486932A (en) * | 1987-09-30 | 1989-03-31 | Olympus Optical Co | Endoscopic apparatus |
JP2823561B2 (en) * | 1988-02-26 | 1998-11-11 | オリンパス光学工業株式会社 | Automatic dimming control device for endoscope |
-
1990
- 1990-01-29 JP JP1990006179U patent/JP2576596Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0398415U (en) | 1991-10-14 |
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Legal Events
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EXPY | Cancellation because of completion of term |