JPS5995518A - Controller for amount of exposure of electric programmed shutter - Google Patents
Controller for amount of exposure of electric programmed shutterInfo
- Publication number
- JPS5995518A JPS5995518A JP20643682A JP20643682A JPS5995518A JP S5995518 A JPS5995518 A JP S5995518A JP 20643682 A JP20643682 A JP 20643682A JP 20643682 A JP20643682 A JP 20643682A JP S5995518 A JPS5995518 A JP S5995518A
- Authority
- JP
- Japan
- Prior art keywords
- aperture
- blade
- region
- amount
- circuit
- 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.)
- Granted
Links
- 206010008531 Chills Diseases 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral 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
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
- G03B7/081—Analogue circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Control For Cameras (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、露光量の制御精度を向上させるようにＬ＆プ
ログラム電電気シーメタおける露光量制御装置に関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exposure amount control device for an L&program electrical seameter to improve exposure control accuracy.
高輝度域の露光量が絞り羽根兼用ノー１−ツタ羽根の三
角波開口特性領域の動作により制御され、低輝度域の露
光量が該シャッタ羽根の三角波開口特性領域につづく台
形波開口特性領域の動作により制御され、台形波開口特
性領域では該／−ンタ羽根の開口量が、アパーチャ内で
の羽根残りを防止するためにアパーチャの開口量よりも
大きくなっているプログラム電気シャッタは、その低輝
度域の露光量制御において、シャッタ羽根の開口量がア
パーチャの開口量に戻るまでの動作遅ｎ時間が、露光量
制御をオーバーにしてしまう欠点があった。The exposure amount in the high brightness area is controlled by the operation of the triangular wave aperture characteristic area of the No. 1 ivy blade that also serves as the aperture blade, and the exposure amount in the low brightness area is controlled by the operation of the trapezoidal wave aperture characteristic area that follows the triangular wave aperture characteristic area of the shutter blade. In the trapezoidal wave aperture characteristic region, the programmed electric shutter has a larger aperture than the aperture in order to prevent blades from remaining in the aperture. In the exposure amount control, there is a drawback that the operation delay n time required for the opening amount of the shutter blade to return to the opening amount of the aperture causes the exposure amount control to exceed.
また、前記シャッタ羽根の如く、開口特性に三角波領域
と台形波領域とが存在するプログラム電気シャッタでは
、光導電素子部のｒ特性を変換しなければならないこと
が知られており、従来は複数（複合タイプを含む）の光
導電素子を切換えて使用するようにしたり、該ジ−ツタ
羽根の動作と連動して動作する受光部絞シを設ける受光
部連動方式にしているので、コストアンプに々つたり機
構が複雑になる欠点があった。In addition, it is known that in a programmed electric shutter whose aperture characteristic has a triangular wave region and a trapezoidal wave region, such as the shutter blade described above, it is necessary to convert the r characteristic of the photoconductive element portion. The photoconductive element (including composite type) can be switched and used, and the light receiving section is linked with a light receiving section diaphragm that operates in conjunction with the operation of the jet blades, so the cost is greatly reduced. This had the disadvantage that the dripping mechanism was complicated.
本発明は、上記の欠点に鑑みなされたもので、その目的
とするところは、露光量の制御が、台形波開口特性領域
を含む絞り羽根兼用シャッタ羽根の動作により制御され
る低輝度状態では、露光量制御回路の制御基準レベルを
変換させて、該シャッタ羽根の該領域の動作におけるア
パーチャの開口量に戻るまでの動作遅れ時間を補償する
よってして、その制御精度を向上させ、また、光導電素
子部のｒ変換を、光導電素子回路に抵抗を並列接続させ
る安価且つ簡単な構成により達成し得るようにしたプロ
グラム電気シャッタにおける露光量制御装置を提供する
ものである。The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to: In a low-brightness state where the exposure amount is controlled by the operation of the shutter blade that also serves as an aperture blade including a trapezoidal wave aperture characteristic region, By converting the control reference level of the exposure amount control circuit and compensating for the operation delay time until returning to the opening amount of the aperture in the operation of the region of the shutter blade, the control accuracy is improved. An object of the present invention is to provide an exposure amount control device for a programmable electric shutter in which r-conversion of a conductive element portion can be achieved by an inexpensive and simple configuration in which a resistor is connected in parallel to a photoconductive element circuit.
以下、図面に基づいて本発明の一実施例を説明する・
Ｅは電池電源、Ｓｌは電源スィッチ、Ｒｘはｒ−１の光
導電素子、ＲＶは補正抵抗、Ｃ１はコンデンサ、Ｒ＋
、Ｒ２及びＲ１３は分圧回路を構成する抵抗、ＣＭ
＋ は非反転入力端子（＋）に制御基準信号として抵抗
Ｒ１とＲ２との接続点の電圧が与えられ、反転入力端子
（−）にコンデンサＣ１と補正抵抗Ｒｖとの接続点の電
圧が与えられる露光時間制御用のコンパレータ回路、Ｓ
２は図示していない絞り羽根兼用シャッタ羽根の開放開
始に連動して開放される計時開始用のスイッチ、Ｍ Ｏ
は該シャッタ羽根の閉鎖動作時期を制御する電磁石で、
以上が普通の電気シャッタの回路構成である。An embodiment of the present invention will be described below based on the drawings. E is a battery power supply, Sl is a power switch, Rx is an r-1 photoconductive element, RV is a correction resistor, C1 is a capacitor, and R+
, R2 and R13 are resistors forming a voltage dividing circuit, CM
+ is given the voltage at the connection point between the resistors R1 and R2 as a control reference signal to the non-inverting input terminal (+), and the voltage at the connection point between the capacitor C1 and the correction resistor Rv to the inverting input terminal (-). Comparator circuit for exposure time control, S
2 is a timing start switch that is opened in conjunction with the start of opening of a shutter blade that also serves as an aperture blade (not shown);
is an electromagnet that controls the closing timing of the shutter blade,
The above is the circuit configuration of a common electric shutter.
以下が本発明に基づく電気的素子の付加である。The following is the addition of electrical elements according to the present invention.
即ち、Ｃ２はコンデンサ、Ｑ＋ 、０．２及びＣ３は
トランジスタ、Ｒ４は抵抗、Ｒ５は直列接続された補正
抵抗Ｒ，と光導電素子Ｒ，との光導電素子回路に並列接
続され得るｒ補正用の抵抗、ＲＩＩ及びＲ７は分圧回路
を構成する抵抗、０Ｍ２は非反転入力端子（＋）に輝度
状態判別用の基準信号として抵抗ＲＩＩ とＲ７との接
続点の電圧が与えられ、反転入力端子（−）Ｋ補正抵抗
Ｒｖと光導電素子Ｒ，との接続点の電圧が与えられる輝
度判別用のコンパレータ回路、Ｄはダイオードである。That is, C2 is a capacitor, Q+, 0.2 and C3 are transistors, R4 is a resistor, R5 is a correction resistor R connected in series, and a photoconductive element R, which can be connected in parallel to the photoconductive element circuit for correction. The resistors RII and R7 are the resistors that constitute a voltage divider circuit, and the voltage at the connection point between the resistors RII and R7 is given to the non-inverting input terminal (+) as a reference signal for determining the brightness state, and 0M2 is the inverting input terminal. (-) A comparator circuit for brightness discrimination to which a voltage at a connection point between the K correction resistor Rv and the photoconductive element R is applied; D is a diode.
次に動作を説明する。Next, the operation will be explained.
先ず、第３図に示す如く、開口特性に三角波領域と台形
波領域とが存在する絞り羽根兼用ジ−ツタ羽根を利用す
るプログラム電気シャッタにおいては、光導電素子部の
ｒ特性は、その三角波領域では、その開口特性（開口の
立上り速度）に対応した１以下の例えば０７５で々けれ
ばならず、また、台形波領域に入ってからは１でなけれ
ば々らない。First, as shown in FIG. 3, in a programmed electric shutter using jet blades that also serve as diaphragm blades, whose aperture characteristics have a triangular wave region and a trapezoidal wave region, the r characteristic of the photoconductive element section has a triangular wave region and a trapezoidal wave region. Then, the value must be 1 or less, for example, 075, corresponding to the aperture characteristics (rise speed of the aperture), and it must be 1 after entering the trapezoidal wave region.
そこで、撮影に際するレリーズ操作の初期に電源スィッ
チＳ１が閉成されると、回路全体如給電が行われ、先ず
、トランジスタＱ＋ が導通して、抵抗Ｒ３及びコンデ
ンサｃ２を短絡するので、トランジスタＱ３は遮断状態
に置かれる。Therefore, when the power switch S1 is closed at the beginning of the release operation during photographing, power is supplied to the entire circuit, and first, the transistor Q+ becomes conductive and short-circuits the resistor R3 and the capacitor c2, so the transistor Q3 is placed in a blocked state.
そして、被写界が高輝度状態の場合は、光導電素子Ｒア
の抵抗値が小さく、ｍ点の電位が低いので、コンパレー
タ回路ＣＭ ２の中力は「■（」レベルに置かれ、トラ
ンジスタＱ２が導通して抵抗Ｒ＋。When the field is in a high brightness state, the resistance value of the photoconductive element Ra is small and the potential at point m is low, so the neutral power of the comparator circuit CM2 is placed at the "■(" level), and the transistor Q2 conducts and resistor R+.
が補正抵抗Ｒｖと光導電素子Ｒ，の直列回路に並列接続
される。従って、この並列の光導電素子回路全体のｒ特
性は、１以下の例えば、０，７５に補正される。is connected in parallel to the series circuit of the correction resistor Rv and the photoconductive element R. Therefore, the r characteristic of the entire parallel photoconductive element circuit is corrected to 1 or less, for example, 0.75.
依って、その「特性の補正は、高輝度状態において、シ
ャンク羽根の三角波開口特性領域内の動作で露光量を制
御することに適するものである。Therefore, the correction of the characteristics is suitable for controlling the exposure amount by operating within the triangular wave aperture characteristic region of the shank blade in a high brightness state.
次に、被写界が低輝度状態では、一旦トランジスタＱ１
が導通、トランジスタＱ３が遮断するカニ、光導電素子
Ｒ８の抵抗値が大きくｍ点の電位が高くコンパレータ回
路ＯＭｐの出力が「Ｌ２レヘルとなるので、直ぐにトラ
ンジスタＱ］が遮断し。Next, when the subject is in a low-brightness state, the transistor Q1
is conductive, transistor Q3 is cut off, the resistance value of photoconductive element R8 is large, the potential at point m is high, and the output of comparator circuit OMp becomes "L2 level, so transistor Q] immediately cuts off.
トランジスタＱ３が導通して、この遮断、導通状態がラ
ッチされる。従って、抵抗Ｒ３の接続が働き、これはコ
ンパレータ回路ＣＭ、の非反転入力端子（＋）に与えら
れる露光時間の制御基準レベルが持ち上げられたことに
なって、抵抗Ｒ３が短絡された時に比べ、相対的に閉鎖
信号が早く発生することを意味し、従って、シャッタ羽
根の台形波開口特性領域の動作におけるアノく−チンの
開口量に戻るまでの動作遅れ時間を補償することになる
。Transistor Q3 becomes conductive, and this cutoff and conduction state is latched. Therefore, the connection of the resistor R3 works, and this means that the exposure time control reference level applied to the non-inverting input terminal (+) of the comparator circuit CM is raised, compared to when the resistor R3 is short-circuited. This means that the closing signal is generated relatively early, thus compensating for the operation delay time until the shutter blade returns to the aperture amount in the trapezoidal wave aperture characteristic region of the operation.
なお、この動作遅れ時間の補償を第３図で考えてみる。Note that compensation for this operation delay time will be considered with reference to FIG.
高輝度域と低輝度域との変曲点を例えばＬｖ １１と仮
定すると、光導電素子部のｒ特性はＬｖ １１で０７５
から１へ連続して変換されるべきであるが、ｒ＝１のス
タート時点が露光時間Ｔの縦軸においてｆ＝０．７５の
終わシからダウンしている分がその補償時間を意味して
いる。Assuming that the inflection point between the high brightness region and the low brightness region is, for example, Lv 11, the r characteristic of the photoconductive element portion is 075 at Lv 11.
It should be continuously converted from f=0.75 to 1, but the amount that the start point of r=1 is down from the end point of f=0.75 on the vertical axis of the exposure time T means the compensation time. There is.
一方、コンパレータ回路ＯＭ２の出力が「Ｌ」レベルに
置かれることにより、トランジスタＱ２が遮断するので
、抵抗Ｒ５は補正抵抗Ｒｖと光導電素子Ｒ，との直列回
路から切シ離されている。On the other hand, since the output of the comparator circuit OM2 is set to the "L" level, the transistor Q2 is cut off, so that the resistor R5 is disconnected from the series circuit of the correction resistor Rv and the photoconductive element R.
従って、その直列回路の光導電素子回路のと特性は１に
置かれている。Therefore, the characteristics of the photoconductive element circuit in the series circuit are set to 1.
そして、レリーズ操作の進行によシフセフ２羽根がレリ
ーズされて開放動作を開始し、それに連動してスインチ
Ｓ２が開放すると、コンデンサＣＩはその直列回路を介
して充電が開始される。Then, as the release operation progresses, the two shutter blades are released and start the opening operation, and in conjunction with this, the switch S2 is opened, and the capacitor CI starts to be charged through its series circuit.
ここで、第２図に示す如く、低輝度状態範囲において、
ある程度暗い時には、コンパレータ回路ＣＭ＋の反転入
力端子（−）の電位の変化は■の様になだらかであり、
寸だｍ点の電位も＠の様に降下する。そして、ｍ点の電
位がコンパレータ回路ＯＭ ２の非反転入力端子（＋）
の電位に達すると、該回路ＣＭ２の出力がｒＨＪレベル
へ反転するので、前述と同様にこの時点から光導電素子
回路のｒ特性が変換される。その後、■の電位がコンパ
レータ回路ＣＭ、の非反転入力端子（＋）の電位に達す
ると、該回路ＣＭ、の出力がｒＨＪレベルへ反転するの
で、電磁石Ｍ Ｇが消磁し、ジ−ツタ羽根は所謂メカ遅
れ時間の後に閉鎖動作を開始する。Here, as shown in FIG. 2, in the low luminance state range,
When it is dark to a certain extent, the potential change of the inverting input terminal (-) of the comparator circuit CM+ is gradual as shown in ■.
The potential at point m also drops like @. Then, the potential at point m is the non-inverting input terminal (+) of the comparator circuit OM2.
When the potential reaches , the output of the circuit CM2 is inverted to the rHJ level, and the r characteristic of the photoconductive element circuit is converted from this point on, as described above. After that, when the potential of ■ reaches the potential of the non-inverting input terminal (+) of the comparator circuit CM, the output of the circuit CM is inverted to the rHJ level, so the electromagnet MG is demagnetized and the jet blade is The closing operation starts after a so-called mechanical delay time.
なお、第２図において、θ及び○は、前記■及び＠に対
応する低輝度状態範囲におけるやや暗い程度の動作特性
であシ、また点線波形は夫々の状態のシャッタ羽根の開
口特性を示している。In Fig. 2, θ and ○ indicate slightly dark operating characteristics in the low-brightness state range corresponding to ■ and @, and the dotted line waveforms indicate the aperture characteristics of the shutter blade in each state. There is.
このように、被写界が低輝度状態で、シャッタ羽根が三
角波開口特性領域と台形波開口特性領域を踏査する動作
を行う場合には、光導電素子部のｒ特性の変換が行われ
るので、露光量の制御が適正方向に近づくものである。In this way, when the shutter blade performs an operation of scanning the triangular wave aperture characteristic area and the trapezoidal wave aperture characteristic area when the subject field is in a low brightness state, the r characteristic of the photoconductive element section is converted. This brings the control of the exposure amount closer to the appropriate direction.
以上の如く、本発明は、絞シ羽根兼用シセッタ羽根の動
作に三角波間ロ特性領域七台形波開ロ特性領域を含むプ
ログラム電気ンヤノタにおいて、該シャンク羽根の台形
波開口特性領域におけるアパーチセの開口量に戻るまで
の動作遅れ時間を補償できるので、露光量制御の精度を
向上させることができ、また、光導電素子部のｒ変換が
安価且つ簡単な構成にょシ行えるものである。As described above, the present invention provides an aperture opening amount in the trapezoidal wave aperture characteristic area of the shank blade in a programmed electronic device including a triangular wave inter-low characteristic area and seven trapezoidal wave open characteristic areas in the operation of the scissetter blade that also serves as the diaphragm blade. Since it is possible to compensate for the delay time until the operation returns to , the accuracy of exposure control can be improved, and r-conversion of the photoconductive element can be performed at a low cost and with a simple structure.
第１図は本発明の一実施例を示した回路図、第２図は該
回路の低輝度状態の動作特性図、第３図は光導電素子部
のｔ特性の一例を示した説明図である。
ＣＭ、・・・露光時間制御用のコンパレータ回路ＣＭ２
・・・輝度状態判別用のコンパレータ回路特許出願人
株式会社 コ パル
第３図
７０１１ノ２７３．１４ノ５１６
Ｌ、 →
手続補正書（方式）
１ 事件の表示
昭和５７年特許Ｈ第２０６４３６号
２ 発明の名称
プログラム電気シーンタにおける露光量制御装置
３ 補正をする者
特許出願人
〒１７４ 東京都板重区志村２の１６の２０電話（９６
５）１１１１
（１２２）株式会社コ パル
昭和５８年２月２日FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the operating characteristics of the circuit in a low brightness state, and FIG. 3 is an explanatory diagram showing an example of the t-characteristic of the photoconductive element section. be. CM,... Comparator circuit CM2 for controlling exposure time
... Comparator circuit for brightness status determination Patent applicant Co. Pal No. 3 7011-273.14-516 L, → Procedural amendment (method) 1 Indication of the case 1982 Patent H No. 206436 2 Invention Name of the program Exposure control device 3 in an electric scener Patent applicant: 2-16-20, Shimura, Itajuku-ku, Tokyo, 174 Telephone number: 96
5) 1111 (122) Copal Co., Ltd. February 2, 1982
Claims (2)
三角波開口特性領域の動作により制御され、低輝度域の
露光量が該シ々ツタ羽根の三角波開口特性領域につづく
台形波開口特性領域の動作により制御され、台形波開口
特性領域では該ンーノタ羽根の開口量がアパーチヤの開
口量よりも大きくなっているプログラム電気シャッタに
おいて、前記シセッタ羽根の開口特性が三角波領域のみ
から台形波領域も含み始める変曲点以下の低輝度状態に
対応して露光量制御回路の制御基準レベルを変換させ、
該シセッタ羽根の台形波開口特性領域の動作におけるア
パーチヤの開口量に戻るまでの動作遅れ時間を補償する
ようにした ととを特徴とする露光量制御装置。(1) The exposure amount in the high brightness region is controlled by the operation of the triangular wave aperture characteristic region of the shutter blade that also serves as the aperture blade, and the exposure amount in the low brightness region is controlled by the trapezoidal wave aperture characteristic region that follows the triangular wave aperture characteristic region of the shivering blade. In the programmed electric shutter, the aperture characteristic of the scissetter blade changes from only the triangular wave region to also includes the trapezoidal wave region. The control reference level of the exposure control circuit is changed in response to the low brightness state below the starting inflection point,
An exposure amount control device comprising: compensating for an operation delay time until the aperture opening amount returns to the aperture amount in the operation of the scissetter blade in the trapezoidal wave aperture characteristic region.
の三角波開口特性領域の動作により制御され、低輝度域
の露光量が該ンーノタ羽根の三角波開口特性領域につづ
く台形波開口特性領域の動作により制御され、台形波開
口特性領域では該ジ−ツタ羽根の開口量がアパーチ〜の
開口量よりも大きくなっているプログラム電気ツヤツタ
において、輝ザ判別回路を設けると共に、該回路と露光
量制御回路に兼用される受光素子Ｃτｒ＝ｌの光導電素
子を使用し１、前記シャッタ羽根の開口特性が三角波領
域のみから台形波領域も含み始める変曲点以下の低輝度
状態に対応する該判別回路の出力により該制御回路の制
御基準レベルを変換ランチして該シャッタ羽根の台形波
開口特性領域の動作におけるアパーチヤの開口量に戻る
までの動作遅れ時間を補償するよう−にし、また、高輝
賓状態では該判別口ｆｆ＆の出力によシ初めから前記光
導電素子回路に抵抗を差動接続させて該光導電素子部の
見掛上のγを１以下に変化させておくと共に、低輝度状
態では該制御回路の計時作動に伴う該光導電素子の端子
電圧の変化に対応する該判別回路の反転出力により該作
動の途中から前述と同様に該光導電素子部の見掛上の（
を１以下に変化させるようにした ことを特徴とする露光量制御装置。(2) The exposure amount in the high brightness area is controlled by the operation of the triangular wave aperture characteristic area of the nunta blade that also serves as the M and h blades, and the exposure amount in the low brightness area is a trapezoidal aperture characteristic area that follows the triangular wave aperture characteristic area of the nunta blade. In the programmed electric gloss, in which the opening amount of the jet blade is larger than the opening amount of the aperture in the trapezoidal wave aperture characteristic region, a brightness discrimination circuit is provided, and the circuit and the exposure amount Using a photoconductive element with a light receiving element Cτr=l which is also used as a control circuit, 1 determines whether the aperture characteristic of the shutter blade corresponds to a low luminance state below an inflection point where the aperture characteristic of the shutter blade starts to include only a triangular wave region and also a trapezoidal wave region. The output of the circuit is used to convert the control reference level of the control circuit to compensate for the operation delay time until the shutter blade returns to the aperture opening amount in the trapezoidal wave opening characteristic region of the shutter blade. In this state, a resistor is differentially connected to the photoconductive element circuit from the beginning according to the output of the discrimination port ff&, so that the apparent γ of the photoconductive element is changed to 1 or less, and in a low brightness state. Then, from the middle of the operation, the apparent (
An exposure amount control device characterized in that the exposure amount control device is configured to change the amount of light to 1 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20643682A JPS5995518A (en) | 1982-11-25 | 1982-11-25 | Controller for amount of exposure of electric programmed shutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20643682A JPS5995518A (en) | 1982-11-25 | 1982-11-25 | Controller for amount of exposure of electric programmed shutter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5995518A true JPS5995518A (en) | 1984-06-01 |
| JPH0514254B2 JPH0514254B2 (en) | 1993-02-24 |
Family
ID=16523340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20643682A Granted JPS5995518A (en) | 1982-11-25 | 1982-11-25 | Controller for amount of exposure of electric programmed shutter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5995518A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62141523A (en) * | 1985-12-14 | 1987-06-25 | Copal Co Ltd | Control circuit for program shutter |
| JPS63179338A (en) * | 1987-01-20 | 1988-07-23 | Copal Co Ltd | Program ae control system |
| JPH0375420U (en) * | 1989-11-24 | 1991-07-29 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56155938A (en) * | 1980-05-02 | 1981-12-02 | Olympus Optical Co Ltd | Adjusting circuit for exposure time |
-
1982
- 1982-11-25 JP JP20643682A patent/JPS5995518A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56155938A (en) * | 1980-05-02 | 1981-12-02 | Olympus Optical Co Ltd | Adjusting circuit for exposure time |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62141523A (en) * | 1985-12-14 | 1987-06-25 | Copal Co Ltd | Control circuit for program shutter |
| JPS63179338A (en) * | 1987-01-20 | 1988-07-23 | Copal Co Ltd | Program ae control system |
| JPH0375420U (en) * | 1989-11-24 | 1991-07-29 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0514254B2 (en) | 1993-02-24 |
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