JPS58136329A - Light emitting control apparatus for photographic apparatus of eye bottom camera - Google Patents

Light emitting control apparatus for photographic apparatus of eye bottom camera

Info

Publication number
JPS58136329A
JPS58136329A JP57017343A JP1734382A JPS58136329A JP S58136329 A JPS58136329 A JP S58136329A JP 57017343 A JP57017343 A JP 57017343A JP 1734382 A JP1734382 A JP 1734382A JP S58136329 A JPS58136329 A JP S58136329A
Authority
JP
Japan
Prior art keywords
light source
light
source driving
driving means
observation
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
Application number
JP57017343A
Other languages
Japanese (ja)
Inventor
権田 常躬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
Nippon Kogaku KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nikon Corp, Nippon Kogaku KK filed Critical Nikon Corp
Priority to JP57017343A priority Critical patent/JPS58136329A/en
Publication of JPS58136329A publication Critical patent/JPS58136329A/en
Pending legal-status Critical Current

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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は眼底カメラ等の撮影装置に使用きれる観察用光
源及び撮影用光源の発光制御装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light emission control device for an observation light source and a photographic light source that can be used in a photographing device such as a fundus camera.

従来のこの種の装置には公開特許公報(昭54−160
232 )等がある。この提案は、一定の露光量を得る
為に露光量を変化きせる様々な条件(変倍・ASA感度
・フィルター挿入)を電源装置に入力し、一定の露光量
になるべきプログラムを組むような方式を採用している
。その結果、観察用光源もプログラムされてしまう為こ
の光源としての電球などの劣下に対して対応が出来ない
と共に医者等の使用者の明るさの好みも無視してしまい
、また写真撮影用光源としての閃光放電管においても光
量の劣下に対して対応が不能であるという欠点があった
Conventional devices of this type are disclosed in the published patent publication (1986-160).
232) etc. This proposal involves inputting various conditions for changing the exposure amount (variable magnification, ASA sensitivity, filter insertion) into the power supply in order to obtain a constant exposure amount, and creating a program to achieve a constant exposure amount. is adopted. As a result, since the light source for observation is also programmed, it is not possible to deal with the deterioration of light bulbs used as light sources, and the brightness preferences of users such as doctors are ignored, and the light source for photography is also programmed. The flash discharge tube also had the drawback of being unable to cope with a decrease in the amount of light.

その一応の解決法として、露光体すなわち結像面と等価
な位置に光電検出手段を設けて被写体からの反射光を測
光し、適正露光量になった時点で閃光放電管の発光を停
止するオートストロボ方式がある。ところがこの方式で
は、受光光量の大小の範囲の広い眼底カメラ等の場合、
発光を停止させる為の停止信号を発するまでの時間的範
囲も広くなり、全ての場合において適正露光量を得るこ
とは技術的に難しくなってくるという欠点がある。
As a temporary solution, a photoelectric detection means is installed at a position equivalent to the exposure body, that is, the imaging plane, and the reflected light from the subject is photometered, and when the appropriate exposure amount is reached, the flash discharge tube stops emitting light. There is a strobe method. However, with this method, in the case of fundus cameras that have a wide range of received light intensity,
The disadvantage is that the time range until a stop signal for stopping light emission is issued becomes wider, and it becomes technically difficult to obtain an appropriate exposure amount in all cases.

本発明はこれ等の欠点を解決し、観察光源の調整を可能
として使用者の好みを満足させ、オートストロボ方゛式
により撮影用光源の劣下を補償し、かつ停止信号の時間
範囲が広いことに起因する適正露光制御動作の技術的な
難しさを解消した発光制御装置を得ることを目的とする
The present invention solves these drawbacks, satisfies the user's preference by making it possible to adjust the observation light source, compensates for the degradation of the photographing light source by using an autostroboscopic method, and has a wide time range for the stop signal. It is an object of the present invention to provide a light emission control device that eliminates the technical difficulty of proper exposure control operation caused by this.

第1図は本発明の一実施例であって、図中Eは人眼、E
f  は眼底、1は対物レンズ、2は結像レンズ、3は
フィルムの置かれる結像面、4は斜設半透鏡、5は可動
斜設鏡、6はレンズ2に対して結像面3と等価な位置に
設置された焦点板、7.8は焦点板6上に結像した像を
観察すべき観察用プリズム及びレンズであり、9は有孔
鏡で、レンズ1.2の光軸に対して斜設されて中央に絞
り開口を具え、10.11は夫々レンズ、12は閃光放
電管でありレンズ1G、11等により人間の眼底Efヲ
照明する。またハロゲン等のランプ14はレンズ13に
対して閃光放電管12と共役な位置に設置され、これ等
のユニットAは眼底カメラを構成する。
FIG. 1 shows an embodiment of the present invention, in which E is a human eye;
f is the fundus, 1 is the objective lens, 2 is the imaging lens, 3 is the imaging plane where the film is placed, 4 is the oblique semi-transparent mirror, 5 is the movable oblique mirror, 6 is the imaging plane 3 for the lens 2 7.8 is an observation prism and lens for observing the image formed on the focusing plate 6, 9 is a perforated mirror, and the optical axis of lens 1.2 is The lens 10 and 11 are lenses, and the flash discharge tube 12 illuminates the fundus Ef of the human eye using lenses 1G, 11, etc. Further, a lamp 14 made of halogen or the like is installed at a position conjugate with the flash discharge tube 12 with respect to the lens 13, and these units A constitute a fundus camera.

さらに光電検出器15は半透鏡4により結像面3とほぼ
等価な位置に設置され、眼底Efを照明するランプ14
又は放電管12による眼底からの反射光を受ける受光ユ
ニットBを構成する。16は観察用ランプ14を駆動す
る観察用電源ユニットCで手動調整可能であり、ユニッ
トDは閃光放電管12を駆動する写真撮影用電源を構成
し、D、 、D2、D、、D4、D5はトリガー回路、
ストップ回路、主コンデンサ−、定電圧電源、比較回路
を各々構成する。
Further, the photoelectric detector 15 is installed at a position approximately equivalent to the imaging plane 3 by means of a semi-transparent mirror 4, and a lamp 14 illuminates the fundus Ef.
Alternatively, a light receiving unit B is configured to receive light reflected from the fundus by the discharge tube 12. 16 is an observation power supply unit C that drives the observation lamp 14 and can be manually adjusted, and unit D constitutes a photography power supply that drives the flash discharge tube 12, D, , D2, D, , D4, D5. is the trigger circuit,
A stop circuit, a main capacitor, a constant voltage power supply, and a comparison circuit are each constructed.

ユニットDの直列制御閃光放電管制御回路は、周知のよ
うに電源D4によりトリガーコンデンサ17、転流コン
デンサー18、主コンデンサ−19,20,21を充電
後、トリガーパルスPによってトリガー用サイリスター
22を導通する。これによりコンデンサー17を放電さ
せる事によって、トリガートランス23の二次側に高圧
を発生させると同時に主サイリスタ−24をも導通させ
、主コンデンサ−19,2・0.21の電荷を閃光放電
管12全通して放電させて閃光放電管を発光させる。こ
こで被写体からの反射光(この場合は眼底Ef  から
の反射光)は光電検出器15で受けられ、プログラム回
路2,5により適正露光量になった時にストyプ(転流
)パルスか出力されて転流サイリスタ26を導通し、転
流コンデンサ18により主サイリスタ24に逆電圧を加
えてこれの導通を断つ。
As is well known, the series control flash discharge tube control circuit of unit D charges the trigger capacitor 17, commutation capacitor 18, and main capacitors 19, 20, and 21 with the power source D4, and then conducts the trigger thyristor 22 with the trigger pulse P. do. By discharging the capacitor 17, a high voltage is generated on the secondary side of the trigger transformer 23, and at the same time, the main thyristor 24 is also made conductive, and the charge of the main capacitor 19,2.0.21 is transferred to the flash discharge tube 12. Discharge all the way through to make the flash discharge tube emit light. Here, the reflected light from the subject (in this case, the reflected light from the fundus Ef) is received by the photoelectric detector 15, and when the appropriate exposure amount is reached by the program circuits 2 and 5, a stop (commutation) pulse is output. The commutating capacitor 18 applies a reverse voltage to the main thyristor 24 to disconnect it.

ここで本実施例においては手動で調整された観察用電源
16の電圧を比較回路り弓の比較器27.28で検出し
、電圧が高い場合すなわち照明を充分に行っている場合
(被写体からの反射が少ない場合)には比較器27.2
8によってリレー29.30が動作してその接点29a
、30aが閉じ、主コンデンサ−19,20,21がす
べて閃光用放電に関与する。他方、電源16の電圧が中
位の場合には比較器27.28によりリレー接点29a
は開路、リレー接点30&は閉路して主コンデンサ−2
0,21のみが放電に関与し、電源16の電圧が低い場
合すなわち照明を充分に行っていない場合(被写体から
の反射光が多い場合)にはリレーの接点29a、30a
共に開路して主コンデンサ−21のみが放電に関与する
ごとく構成されている。
In this embodiment, the manually adjusted voltage of the observation power source 16 is detected by the comparators 27 and 28 of the comparator circuit, and when the voltage is high, that is, when the illumination is sufficient (the voltage from the subject is comparator 27.2 if there is little reflection)
8 causes relay 29.30 to operate and its contact 29a
, 30a are closed and the main capacitors 19, 20, 21 are all involved in the flash discharge. On the other hand, when the voltage of the power supply 16 is medium, the relay contact 29a is
is open, relay contact 30 & is closed, and main capacitor -2
Only contacts 0 and 21 are involved in the discharge, and when the voltage of the power supply 16 is low, that is, when the lighting is not sufficient (when there is a lot of reflected light from the subject), the relay contacts 29a and 30a
Both are open-circuited so that only the main capacitor 21 participates in the discharge.

従って、写真撮影に先立って使用者が眼底Ef  から
の反射光を観察しつつこの明るさが自分の好みになるよ
うに観察光用電源16を調整すると、これに関連して、
眼底Ef  が暗い場合すなわちランプ14の照明を充
分に行っている場合には放電管12の発光量も大きくす
る必要がある。ので主コンデンサを多く働かせるように
し、その逆の場合には放電管12の発光量は小さくて済
むはずであるので主コンデンサを少なく働かせるようV
Cなっている。
Therefore, when the user observes the reflected light from the fundus Ef and adjusts the observation light power source 16 to adjust the brightness to his/her preference prior to taking a photograph, in this regard,
When the fundus Ef is dark, that is, when the lamp 14 is sufficiently illuminated, it is necessary to increase the amount of light emitted from the discharge tube 12. Therefore, the main capacitor should be made to work more, and in the opposite case, the amount of light emitted from the discharge tube 12 should be small, so the main capacitor should be made to work less.
It's C.

この様に観察時にすでに主コンデンサーの大きさが選択
されているので放電管12の最大発光量も定まっており
、光電検出器15及びプログラム回路25の動作時間に
対する動作範囲が狭くなり、゛その分だけ適正露光制御
動作が確実になると共に光電素子その他回路の時間的な
作動遅れが緩和される。すなわち、これにより停止信号
の時間的範囲が広いことに起因する技術的な難しさが解
決される。
In this way, since the size of the main capacitor has already been selected at the time of observation, the maximum amount of light emitted by the discharge tube 12 is also determined, and the operating range for the operating time of the photodetector 15 and program circuit 25 becomes narrower. As a result, proper exposure control operation is ensured, and time delays in the operation of photoelectric elements and other circuits are alleviated. That is, this solves the technical difficulty caused by the wide temporal range of the stop signal.

ところで上記実施例では3段階の主コンデンサーの切換
えを行なっているが切換え数はこれに限ったものではな
く、マた主コンデンサーの切換えを第2図に示すごとく
、第1図の抵抗31.32ではなくダイオード33.3
4に置換えると、充電時間が短くなり放電管12の発光
間隔が短く出来る。
By the way, in the above embodiment, the main capacitor is switched in three stages, but the number of switches is not limited to this, and the switching of the main capacitor is shown in FIG. not a diode 33.3
If it is replaced by 4, the charging time will be shortened and the interval between light emissions from the discharge tube 12 can be shortened.

さらに第3図に示すごとく、第1図、第2図の主コンデ
ンサー切換リレー29.30をサイリスタ35.36に
置換えても良い。
Furthermore, as shown in FIG. 3, the main capacitor switching relays 29, 30 in FIGS. 1 and 2 may be replaced with thyristors 35, 36.

以上の様に本発明によれば、観察者の観察光量の好みに
対応出来ると共に、その好みによる露光量の差及び観察
・撮影光源とI〜での電球・放電管などの劣下による差
は自動調光(オートストロボ)によって吸収でき、更に
撮影光源としての閃光放電管などの最大発光値がその都
度ある範囲内に限定される為に調光回路の動作が確実に
なる。
As described above, according to the present invention, it is possible to accommodate the preference of the observation light amount of the observer, and also to eliminate the difference in exposure amount due to the preference and the difference due to the deterioration of the light bulb, discharge tube, etc. between the observation/photography light source and I~. It can be absorbed by automatic flash control (auto strobe), and furthermore, since the maximum light emission value of a flash discharge tube or the like used as a photographic light source is limited within a certain range each time, the operation of the light control circuit is ensured.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の図、 第2図と第3図は、夫々主コンデンサー切換部の変形例
の図である。 〔主要部分の符号の説明〕 12・・・撮影用光源 14・・・観察用光源 B・・・受光手段 C・・・観察用光源駆動手段 り、、24・・・トリガ一手段 り、・・・停止手段 り、・・・撮影用光源駆動手段 り、・・・制御手段 矛1区 第2図
FIG. 1 is a diagram of one embodiment of the present invention, and FIGS. 2 and 3 are diagrams of modified examples of the main capacitor switching section, respectively. [Explanation of symbols of main parts] 12...Photographing light source 14...Observation light source B...Light receiving means C...Observation light source driving means, 24...Trigger means,...・Stopping means ・Photographing light source driving means ・Control means Section 1 Section 2 Figure

Claims (1)

【特許請求の範囲】 眼底カメラ等の゛撮影装置において、 観察用光源と;出力調整回部な観察用光源駆動手段と:
撮影用光源と;撮影用光源駆動手段と;観察用光源駆動
手段の出力に関連して撮影用光源駆動手段の最大出力を
制御する制御手段と;撮影用光源駆動手段をトリガーす
るトリガ一手段と;被写体からの反射光を受ける受光手
段と;受光手段からの信号に基づいてトリガ一手段作動
から一定時間後撮影用光源駆動手段を不作動にする停止
手段と;を有することを特徴とする発光制御装置。
[Claims] In an imaging device such as a fundus camera, an observation light source; an observation light source driving means such as an output adjustment circuit:
a photographing light source; a photographing light source driving means; a control means for controlling the maximum output of the photographing light source driving means in relation to an output of the observing light source driving means; a trigger means for triggering the photographing light source driving means; A light emitting device comprising: a light receiving means for receiving reflected light from a subject; and a stopping means for deactivating the photographing light source driving means after a certain period of time after the trigger means is activated based on a signal from the light receiving means. Control device.
JP57017343A 1982-02-05 1982-02-05 Light emitting control apparatus for photographic apparatus of eye bottom camera Pending JPS58136329A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57017343A JPS58136329A (en) 1982-02-05 1982-02-05 Light emitting control apparatus for photographic apparatus of eye bottom camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57017343A JPS58136329A (en) 1982-02-05 1982-02-05 Light emitting control apparatus for photographic apparatus of eye bottom camera

Publications (1)

Publication Number Publication Date
JPS58136329A true JPS58136329A (en) 1983-08-13

Family

ID=11941403

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57017343A Pending JPS58136329A (en) 1982-02-05 1982-02-05 Light emitting control apparatus for photographic apparatus of eye bottom camera

Country Status (1)

Country Link
JP (1) JPS58136329A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60122539A (en) * 1983-12-07 1985-07-01 キヤノン株式会社 Ophthalmic photographing apparatus
JPH0231730A (en) * 1988-07-22 1990-02-01 Canon Inc Ophthalmic imaging apparatus
JPH03114434A (en) * 1990-09-10 1991-05-15 Topcon Corp Ophthalmic photographing apparatus
JPH074085A (en) * 1993-03-31 1995-01-10 Tsukasa Sangyo Kk Painting method for pool, water tank, etc

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57166140A (en) * 1981-04-08 1982-10-13 Olympus Optical Co Proper exposure control circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57166140A (en) * 1981-04-08 1982-10-13 Olympus Optical Co Proper exposure control circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60122539A (en) * 1983-12-07 1985-07-01 キヤノン株式会社 Ophthalmic photographing apparatus
JPH0231730A (en) * 1988-07-22 1990-02-01 Canon Inc Ophthalmic imaging apparatus
JPH03114434A (en) * 1990-09-10 1991-05-15 Topcon Corp Ophthalmic photographing apparatus
JPH042249B2 (en) * 1990-09-10 1992-01-17
JPH074085A (en) * 1993-03-31 1995-01-10 Tsukasa Sangyo Kk Painting method for pool, water tank, etc

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