JPS584121A - Controlling circuit for auto-stroboscope - Google Patents
Controlling circuit for auto-stroboscopeInfo
- Publication number
- JPS584121A JPS584121A JP56102470A JP10247081A JPS584121A JP S584121 A JPS584121 A JP S584121A JP 56102470 A JP56102470 A JP 56102470A JP 10247081 A JP10247081 A JP 10247081A JP S584121 A JPS584121 A JP S584121A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- conversion diode
- logarithmic conversion
- connection point
- light
- 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
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000035945 sensitivity Effects 0.000 claims abstract description 7
- 238000005375 photometry Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 abstract description 5
- 240000007320 Pinus strobus Species 0.000 description 9
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000004043 responsiveness Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
- G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2215/00—Special procedures for taking photographs; Apparatus therefor
- G03B2215/05—Combinations of cameras with electronic flash units
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Stroboscope Apparatuses (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、閃光管の発光により照射された被写体輝度を
対数変換して演算に供するようにしたオートストロボ制
御回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an autostroboscopic control circuit that logarithmically converts the brightness of a subject illuminated by light emission from a flash tube and uses the logarithmically converted luminance for calculation.
オートストロボは、閃光管の発′光により照射された被
写体の輝度を測定して、その反射光の光量が一定値にな
ったときに発光を停止し、像面光量が一定値になるよっ
に発光時間を制御するものである。An auto strobe measures the brightness of the subject illuminated by the light emitted from the flash tube, and stops emitting light when the amount of reflected light reaches a certain value. This controls the light emission time.
従来のオートストロボのほとんどは、被ず体からの反射
光を光電流に変換し、この光電流をそのままコンデンサ
で積分するようになっている。したがって、その測定レ
ンジが、１０２程度と狭いため、絞り、フィルム感度の
使用範囲が制限されるという欠点がある。Most conventional autostrobes convert light reflected from the lens into photocurrent, and integrate this photocurrent directly with a capacitor. Therefore, since the measurement range is narrow, about 102, there is a drawback that the usable range of aperture and film sensitivity is limited.
そこで、特開昭５４−７３０２９号においては、被写体
輝度を対数変換して演算に供するようにして、測定レン
ジを従来の１０２程度カ・ら１０６程度まで広くするこ
とに成功している。Therefore, in JP-A-54-73029, the subject brightness is logarithmically converted and used for calculation, thereby successfully widening the measurement range from about 102 to about 106.
この特開昭５４−７３０２９号のオートストロボ制御回
路によれば、対数変換を用いて測定レンジを広げること
により広範囲な絞９とフィルム感度を使用することがで
きるため、実用上非常に便利である。しかしながら、上
記対数変換する手段として演算増幅器の負入力端子と出
力端子とを結ぶ帰還回路にログダイオードを接続してな
る対数圧縮回路を用いているが、この対数圧縮回路は演
算増幅器の演算時間に起因して応答時間が数１０μ式と
遅くストロボ用測光回路に用いるには不適当であり”、
従って上記特開昭５４−７３０２９号のオートストロボ
制御装置にあっては対数圧縮回路の演算回路に基づく応
答性の悪さから誤動作を生ずるおそれがあった。According to the auto strobe control circuit disclosed in JP-A-54-73029, a wide range of apertures and film sensitivities can be used by widening the measurement range using logarithmic conversion, which is very convenient in practice. . However, as a means for the above-mentioned logarithmic conversion, a logarithmic compression circuit consisting of a log diode connected to a feedback circuit connecting the negative input terminal and output terminal of the operational amplifier is used. As a result, the response time is a few tens of microns, making it unsuitable for use in photometry circuits for strobes.
Therefore, in the auto flash controller disclosed in Japanese Patent Application Laid-open No. 54-73029, there is a risk of malfunction due to poor responsiveness based on the arithmetic circuit of the logarithmic compression circuit.
そこで本発明は、応答性のよい対数圧縮回路を組み込ん
だ測光回路を備えたオートストロボ制御回路を提供する
ことを目的とするものである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an auto flash control circuit equipped with a photometric circuit incorporating a logarithmic compression circuit with good responsiveness.
本発明によるオートストロボ制御回路は、測光回路が、
定電圧回路に直列に接続された受光素子と対数変換ダイ
オード、およびこの対数変換ダイオードに接続された温
度補償回路からなり、受光素子と対数変換ダイオードと
の接続点から測光値を出力することを特徴とするもので
ある。In the auto strobe control circuit according to the present invention, the photometry circuit
It consists of a photodetector and a logarithmic conversion diode connected in series to a constant voltage circuit, and a temperature compensation circuit connected to the logarithm conversion diode, and is characterized by outputting a photometric value from the connection point between the photodetector and the logarithm conversion diode. That is.
本発明のオートストロボ制御回路は、対数圧縮回路に演
算増幅器を用いず、測光値を、上記した構成の測光回路
において受光素子と対数変換ダイオードの接続点の電圧
降下として出力しているので、応答時間が極めて速くな
る。本発明の発明者等の実験によれば、本発明のオート
ストロボ制御回路に用いた測光回路の応答時間は約３μ
％程度であり、これは従来のものと比べて一部速い応答
速度である。The auto strobe control circuit of the present invention does not use an operational amplifier in the logarithmic compression circuit, and outputs the photometric value as a voltage drop at the connection point between the light receiving element and the logarithmic conversion diode in the photometric circuit configured as described above. Time becomes extremely fast. According to experiments conducted by the inventors of the present invention, the response time of the photometry circuit used in the auto strobe control circuit of the present invention is approximately 3μ.
%, which is a partially faster response speed than the conventional one.
以下、添付図面を参照して本発明の好ましい実施例によ
るストロボ制御装置を説明する。Hereinafter, a strobe control device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
図において符号１は、シリコンブルーセルのような光起
電力型受光素子であり、この受光素子１は閃光管（図示
せず）の発光により照射された被写体の輝度を測光する
ためのものである。この受光素子１は、接続点Ｃにおい
て対数変換用ダイオード２と直列に接続されている。こ
の対数変換用ダイオード２は、定電圧回路３からの所定
電流でバイアスされたダイオード４に接続されている。In the figure, reference numeral 1 denotes a photovoltaic type light-receiving element such as a silicon blue cell, and this light-receiving element 1 is used to measure the brightness of a subject illuminated by light from a flash tube (not shown). . This light receiving element 1 is connected in series with a logarithmic conversion diode 2 at a connection point C. This logarithmic conversion diode 2 is connected to a diode 4 biased with a predetermined current from a constant voltage circuit 3.
従って、対弊変換用ダイオード２の一端には、ダイオー
ド４の順方向電圧が供恰情れているＯダイオード４は、
対数変換用ダイオード２の出力の温度変化分を補償する
ための温度補償回路キ５の一部をなすものである。この
湿度補償回路５と対数変換用ダイオード２０間には、ボ
ルテージホロワ６が挿入されており、このボルテージホ
ロワ６は、出力電圧を入力電圧と等しくする作用を行な
うものであるＯ受光素子１は、上記定電圧回路３からの
所定電圧でバイアスされているのが望ましい。Therefore, the O diode 4 whose forward voltage of the diode 4 is applied to one end of the diode 2 for conversion to the current state is as follows.
It forms part of a temperature compensation circuit 5 for compensating for temperature changes in the output of the logarithmic conversion diode 2. A voltage follower 6 is inserted between the humidity compensation circuit 5 and the logarithmic conversion diode 20. is preferably biased with a predetermined voltage from the constant voltage circuit 3.
以上から構成される測光回路の出力を、ストロボ制御用
の演算増幅器７ｖこ入力するため、この演算増幅器７は
その正入力端子が接続点Ｃに接続されている。一方、こ
の演算増幅器７の負入力端子りでは、フィルム感度設定
回路８と絞り設定回路９とが接続されている。The positive input terminal of the operational amplifier 7 is connected to the connection point C in order to input the output of the photometric circuit constructed as described above to the operational amplifier 7v for strobe control. On the other hand, the negative input terminal of the operational amplifier 7 is connected to a film sensitivity setting circuit 8 and an aperture setting circuit 9.
次に上記構成を有する本発明の作用について説明する。Next, the operation of the present invention having the above configuration will be explained.
閃光管が閃光して被写体が照射されると、被写体からの
反射光を受光素子１が受光し、受光素子１は被￥体の輝
度すなわち受光した光に応じて光電流を発生する。この
光電流は、対数変換用ダイオード２に流れ、この結果接
続点Ｃの電圧の降下が生ずる。なお、この接続点Ｃの電
圧は、通常１００〜７００ ｆｆ１Ｖ Ｋ変化すること
が知られており、従って上記電圧降下分を効率よく測定
するために、定電圧回路３による受光素子１のバイアス
は２００〜５００ｆｎＶとすることが望ましい。When the flash tube flashes and the subject is illuminated, the light receiving element 1 receives the reflected light from the subject, and the light receiving element 1 generates a photocurrent according to the brightness of the subject, that is, the received light. This photocurrent flows through the logarithmic conversion diode 2, resulting in a voltage drop at the connection point C. It is known that the voltage at this connection point C usually changes by 100 to 700 ff1V K. Therefore, in order to efficiently measure the voltage drop, the bias of the light receiving element 1 by the constant voltage circuit 3 is set to 200 to 700 ff1V K. It is desirable to set it to 500 fnV.
上記した接続点Ｃの電圧が演算増幅器７に人力されると
、この演算増幅器７はこの電圧とともに、フィルム感度
設定回路８および絞り設定回路９で設定されたフィルム
感度情報および絞り情報を演算し発光停止信号Ｓを発生
し、閃光管の発光を停止する。When the voltage at the connection point C mentioned above is input to the operational amplifier 7, the operational amplifier 7 calculates this voltage as well as the film sensitivity information and aperture information set in the film sensitivity setting circuit 8 and the aperture setting circuit 9, and emits light. A stop signal S is generated to stop the flash tube from emitting light.
上記構成を有する本発明によれば、受光素子の光電流が
そのままとの受光素子と対数変換用ダイオードの間の接
続点における電圧降下として現われるので、測光の応答
が速やかであり、従ってストロボの発光停止制御もタイ
ムラグがなくかつ正確に行なうことができる。According to the present invention having the above configuration, the photocurrent of the light receiving element appears as it is as a voltage drop at the connection point between the light receiving element and the logarithmic conversion diode, so the response of photometry is quick, and therefore the strobe emits light. Stop control can also be performed accurately and without time lag.
図は、本発明のオートストロボ制御回路の主要部を示す
回路図である。
１・・・・・・受 光 素 子 ２・・・・・・対数
変換用ダイオード３・・・・・・定電圧回路 ４・・・
・・・ダ イ オ − ド５・・・・・・ｉ度１償回路
６・・・・・・ボルテージホロワ７・・・・・・演算増
幅器
°図面の浄書（内容に変更なし）
（自発）手続補正書
特許庁長官殿
１、事件の表示
昭和５６年特許願第１０２４７０号
、補正をする者
事件との関係 特許出願人
、代 理 人
な し
ｊ、補正により増加する発明の数 な し１
、補正の対象 図 面３・ 補正ノ内容
図面を墨入れ図面に補正します。The figure is a circuit diagram showing the main parts of the autostroboscopic control circuit of the present invention. 1... Light receiving element 2... Logarithmic conversion diode 3... Constant voltage circuit 4...
...Diode 5...I degree compensation circuit 6...Voltage follower 7...Operation amplifier (Spontaneous) Procedural amendment to the Commissioner of the Japan Patent Office 1, Indication of the case, Patent Application No. 102470 of 1980, Person making the amendment, Relationship to the case, Patent applicant, no agent, number of inventions increased by the amendment, etc. 1
, Target of correction Drawing 3・Contents of correction Correct the drawing into an inked drawing.
Claims (1)
型受光素子を含む測光回路によって測光し、この測光値
と、フィルム感度および絞り値情報とを演算増幅器に入
力して演算し、この演算した値が所定光量値となったと
きに発光停止信号を発生する発光停止信号発生回路を備
えたオートストロボ制御回路において、前記測光回路が
、定電圧回路に直列に接続された前記受光素子と対数変
換ダイオード、およびこの対数変換ダイオードに接続さ
れた温度補償回路からなり、前記受光素子と対数変換ダ
イオードとの接続点から前記測光値を出力することを特
徴とするオートストロボ制御回路。The brightness of the subject illuminated by the light emitted from the flash tube is measured by a photometry circuit that includes a photovoltaic photodetector, and this photometry value and film sensitivity and aperture value information are input to an operational amplifier and calculated. In an auto strobe control circuit including a light emission stop signal generating circuit that generates a light emission stop signal when a value reached a predetermined light intensity value, the photometry circuit has a logarithmic relationship with the light receiving element connected in series to a constant voltage circuit. An auto strobe control circuit comprising a conversion diode and a temperature compensation circuit connected to the logarithmic conversion diode, and outputting the photometric value from a connection point between the light receiving element and the logarithmic conversion diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56102470A JPS584121A (en) | 1981-07-01 | 1981-07-01 | Controlling circuit for auto-stroboscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56102470A JPS584121A (en) | 1981-07-01 | 1981-07-01 | Controlling circuit for auto-stroboscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS584121A true JPS584121A (en) | 1983-01-11 |
Family
ID=14328330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56102470A Pending JPS584121A (en) | 1981-07-01 | 1981-07-01 | Controlling circuit for auto-stroboscope |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS584121A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0239072A2 (en) | 1986-03-25 | 1987-09-30 | Hitachi, Ltd. | Switching power supply |
-
1981
- 1981-07-01 JP JP56102470A patent/JPS584121A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0239072A2 (en) | 1986-03-25 | 1987-09-30 | Hitachi, Ltd. | Switching power supply |
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