JPS638447B2 - - Google Patents
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- Publication number
- JPS638447B2 JPS638447B2 JP50074843A JP7484375A JPS638447B2 JP S638447 B2 JPS638447 B2 JP S638447B2 JP 50074843 A JP50074843 A JP 50074843A JP 7484375 A JP7484375 A JP 7484375A JP S638447 B2 JPS638447 B2 JP S638447B2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- photoconductive element
- input
- exposure
- amplifier
- 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
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- Exposure Control For Cameras (AREA)
Description
【発明の詳細な説明】
〔発明の目的〕
(産業上の利用分野)
本発明は、8ミリシネカメラ等に用いる露出制
御用演算装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an exposure control calculation device used in an 8 mm cine camera or the like.
(従来の技術)
一般に適正露出値Fは、撮影入力情報としての
シヤツタ速度をT、被写体輝度をB、フイルム感
度をSとすると、
F=K・T・B・S ……(1)
で表わされる。ただし、Kは定数である。(Prior art) In general, the appropriate exposure value F is expressed as F=K・T・B・S...(1) where T is the shutter speed as shooting input information, B is the subject brightness, and S is the film sensitivity. It can be done. However, K is a constant.
上記式(1)で示されるように、適正露出値演出の
ための撮影入力情報は、乗算して求める。 As shown in the above equation (1), the photographing input information for producing an appropriate exposure value is obtained by multiplication.
ここでまず、従来の光導電素子を用いた方式の
代表的な回路を第2図を参照して説明する。 First, a typical circuit using a conventional photoconductive element will be described with reference to FIG.
図において、電源Eに対して光導電素子Cdsと
露出モータMとが直列に接続され、その露出メー
タMに対しASA感度変換用の抵抗r1,r2……r6,
r7と撮影(駒数)スピードの変換数に等しい連動
移動接点S2,S3,S4および切換スイツチS1が並列
に接続されている。そして前記光導電素子Cdsの
前面にタングステン、デイライトタイプのフイル
ム感度変換用のNDフイルタが設けられている。 In the figure, a photoconductive element Cds and an exposure motor M are connected in series to a power source E, and resistors r 1 , r 2 ... r 6 , for ASA sensitivity conversion are connected to the exposure meter M.
Interlocking moving contacts S 2 , S 3 , S 4 and changeover switch S 1 are connected in parallel, which is equal to the conversion number of r 7 and the shooting (number of frames) speed. In front of the photoconductive element Cds, a tungsten, daylight type ND filter for converting film sensitivity is provided.
この場合、ASA感度変換用の抵抗r1,r2……
r6,r7が駒数変換抵抗として共用されているの
で、カメラの撮影(駒数)スピードは、ASA感
度変換量に等しい。例えば撮影(駒数)スピード
は、18〜29〜47(F/S)の2/3EV(Exposure
Value)間隔差に限定されている。 In this case, the resistors r 1 , r 2 for ASA sensitivity conversion...
Since r 6 and r 7 are commonly used as frame number conversion resistors, the camera's shooting (frame number) speed is equal to the ASA sensitivity conversion amount. For example, the shooting (number of frames) speed is 2/3EV (Exposure) of 18-29-47 (F/S).
Value) is limited to interval differences.
(発明が解決しようとする問題点)
しかしながら、上記従来の光導電素子を用いる
入力方式のものでは、乗算された形式で入力情報
を設定することが極めて困難であり、特に入力情
報が多数になると、電気回路の構成および機械的
構成が煩雑となる。(Problems to be Solved by the Invention) However, with the above conventional input method using a photoconductive element, it is extremely difficult to set input information in a multiplied format, especially when there is a large number of input information. , the configuration of the electric circuit and the mechanical configuration become complicated.
本発明は、上記問題点に鑑みなされたもので、
簡単な変換手段により入力情報回路を簡明にし、
光導電素子の特性を利用でき、さらに、附属回路
の制限がなく、露出メータの作成が容易な露出制
御用演算装置を提供することを目的とする。 The present invention was made in view of the above problems, and
Simplify the input information circuit with a simple conversion method,
It is an object of the present invention to provide an exposure control arithmetic device that can utilize the characteristics of a photoconductive element, has no restrictions on auxiliary circuits, and can easily create an exposure meter.
(問題点を解決するための手段)
本発明の露出制御用演算装置は、2個の入力端
子を有し反転入力端子と出力端子との間に帰還抵
抗R5が接続されたオペレーシヨンアンプOAの一
方の入力端子に光量を検出する光導電素子Cdsの
一端を接続し、かつ上記オペレーシヨンアンプ
OAの他方の入力端子に各種の設定入力情報を与
える抵抗R1およびスイツチT,S5,S6……S10,
S11,BLC群を接続するとともに、上記オペレー
シヨンアンプOAの出力端子に露出メータMを接
続し、さらに上記光導電素子Cdsに直列の抵抗Ra
と並列の抵抗Rbとを接続したものである。
(Means for Solving the Problems) The exposure control arithmetic device of the present invention includes an operation amplifier OA having two input terminals and a feedback resistor R5 connected between the inverting input terminal and the output terminal. Connect one end of the photoconductive element Cds that detects the amount of light to one input terminal of the
Resistor R1 and switches T, S5 , S6 ... S10 , which provide various setting input information to the other input terminal of OA
S 11 , the BLC group is connected, an exposure meter M is connected to the output terminal of the operation amplifier OA, and a resistor Ra is connected in series with the photoconductive element Cds.
and a parallel resistor Rb.
(作用)
本発明は、オペレーシヨンアンプOAの一方の
入力端子に接続されたスイツチT,S5,S6……
S10,S11,BLC群を開閉し、各抵抗R1の接続を
選択して抵抗値を変化させ、入力情報を設定す
る。他方の入力端子には光導電素子Cdsの抵抗値
を直列の抵抗Raと並列の抵抗Rbにより等差数列
的に変化させて光量を出力する。(Function) The present invention provides switches T, S 5 , S 6 . . . connected to one input terminal of the operational amplifier OA.
Open and close the S 10 , S 11 , and BLC groups, select the connection of each resistor R 1 to change the resistance value, and set input information. The other input terminal outputs the amount of light by varying the resistance value of the photoconductive element Cds in an arithmetic progression using a series resistor Ra and a parallel resistor Rb.
そして、それぞれ入力された入力情報および光
量の情報によりオペレーシヨンアンプOAから出
力電圧を出力し、露出メータMを作動させる。 Then, an output voltage is output from the operation amplifier OA based on the input information and light amount information that have been input, respectively, and the exposure meter M is operated.
また、帰還抵抗R5により帰還比を変化させ、
特性を補正する。 In addition, the feedback ratio is changed by feedback resistor R5 ,
Correct characteristics.
(実施例)
以下、本発明の露出制御用演算装置の一実施例
を図面を参照して説明する。(Embodiment) Hereinafter, one embodiment of the exposure control calculation device of the present invention will be described with reference to the drawings.
第1図に示すように、2個の入力端子を有する
差動増幅形のオペレーシヨンアンプOAで非反転
増幅回路を構成し、一方の反転入力端子に光量を
検出する光導電素子Cdsを抵抗R4を介して他方の
非反転入力端子に後述の各種設定入力情報を設定
する抵抗R1およびスイツチT,S5,S6……S10,
S11,BLC群をそれぞれ接続するとともに、上記
オペレーシヨンアンプOAの出力側に露出メータ
Mを接続する。上記オペレーシヨンアンプOAの
反転入力と出力端子との間に帰還抵抗R5を接続
し、さらに上記光導電素子Cdsに直列の抵抗Raと
並列の抵抗Rbとを接続する。上記の各種設定入
力情報とは、既述のシヤツタ速度T、被写体輝度
Bおよびフイルム感度Sをいい、それらの設定入
力情報事項は、スイツチT,S5,S6……S10,
S11,BLC群の操作による抵抗R1群の選択的な接
続によつて変更し調整する。 As shown in Figure 1, a non-inverting amplifier circuit is configured with a differential amplification type operational amplifier OA having two input terminals, and a photoconductive element Cds for detecting the amount of light is connected to one inverting input terminal with a resistor R. A resistor R 1 and switches T, S 5 , S 6 ...S 10 , which set various setting input information to be described later to the other non-inverting input terminal via 4 .
S 11 and BLC groups are connected to each other, and an exposure meter M is connected to the output side of the operation amplifier OA. A feedback resistor R5 is connected between the inverting input and the output terminal of the operation amplifier OA, and a series resistor Ra and a parallel resistor Rb are connected to the photoconductive element Cds. The above-mentioned various setting input information refers to the shutter speed T, subject brightness B, and film sensitivity S mentioned above, and these setting input information items include switches T, S 5 , S 6 ...S 10 ,
S 11 , changed and adjusted by selective connection of resistor R 1 group by operation of BLC group.
オペレーシヨンアンプOAの特性によると、
∂VM=−(Va−Vb)A ……(2)
VM=Vb−(Va−Vb)×R5/R4 ……(3)
が成立する。ここに式中の符号は、下記の事項を
表わす。 According to the characteristics of the operation amplifier OA, ∂V M =−(Va−Vb)A (2) V M =Vb−(Va−Vb)×R 5 /R 4 (3) holds true. Here, the symbols in the formula represent the following items.
Va;反転入力側接続点電圧
Vb;非反転入力側電圧
VM;露出メータ端子電圧
A;利得(抵抗の比R5/R4)
したがつて、光導電素子Cdsおよびこの光導電
素子Cdsと抵抗R1との間に接続された抵抗R3を含
む回路の抵抗値で分圧した電圧、つまり反転入力
側接続電圧Vαは、光量に比例した等差数列とな
る入力情報として得られる。Va; Inverting input side connection point voltage Vb; Non-inverting input side voltage VM ; Exposure meter terminal voltage A; Gain (resistance ratio R 5 /R 4 ) Therefore, photoconductive element Cds and this photoconductive element Cds The voltage divided by the resistance value of the circuit including the resistor R 3 connected between the resistor R 1 and the inverting input side connection voltage Vα is obtained as input information that is an arithmetic progression proportional to the amount of light.
光導電素子Cdsを含む回路は、光量比例の等差
数列となる電圧Vaを与えるために、既に述べた
ように光導電素子Cdsに対して直列の抵抗Raと並
列の抵抗Rbとを有している。そしてその回路の
合成抵抗値Rcdsは、
Rcds=R3Va/Vcc−Va ……(4)
によつて求められる。ここで抵抗R3は、任意に
決定できる。 As already mentioned, the circuit including the photoconductive element Cds has a resistor Ra in series and a resistor Rb in parallel with the photoconductive element Cds, in order to provide a voltage Va that is an arithmetic progression proportional to the amount of light. There is. The combined resistance value Rcds of the circuit is determined by Rcds=R 3 Va/Vcc-Va (4). Here, the resistance R 3 can be arbitrarily determined.
さて、一般に光導電素子Cdsの輝度特性は、縦
軸を対数目盛〔KΩ〕としたとき、一定の傾きを
もつたほとんど直線となる。この変化率はγ特性
と呼ばれる。 Generally, the brightness characteristic of the photoconductive element Cds is almost a straight line with a constant slope when the vertical axis is on a logarithmic scale [KΩ]. This rate of change is called the γ characteristic.
撮影可能な最高輝度のときの光導電素子Cdsの
抵抗値をA〔KΩ〕、撮影可能な最低輝度のときの
抵抗値をC〔KΩ〕とし、これらの電圧Vaを決定
する合成抵抗値Rcdsの理想値をそれぞれX〔K
Ω〕およびY〔KΩ〕とすると、XおよびYは、
X=Ra+A・Rb/(A+Rb)
Y=Ra+C・Rb/(A+Rb) ……(5)
となる。 Assuming that the resistance value of the photoconductive element Cds at the highest brightness that can be photographed is A [KΩ], and the resistance value at the lowest brightness that can be photographed is C [KΩ], the combined resistance value Rcds that determines these voltages Va is Let the ideal values be X [K
[Ω] and Y [KΩ], then X and Y are as follows: X=Ra+A・Rb/(A+Rb) Y=Ra+C・Rb/(A+Rb) (5)
上記に両式(4)(5)により、光導電素子Cdsと直列
および並列の抵抗Ra,Rbの値が決定される。こ
の抵抗値Ra,Rbを用いて電圧Vaが輝度に応じ
て直線的に変化するための、光導電素子Cdsの理
想変化曲線を計算すると、縦軸を対数目盛とした
第3図iに示すごとく抵抗値A〔KΩ〕およびC
〔KΩ〕を通る曲線となる。この曲線のA〜C間
を注目すると、ほとんど直線であり、この区間で
は実際の光導電素子Cdsの輝度特性とほぼ合致し
ている。 The values of the resistors Ra and Rb in series and in parallel with the photoconductive element Cds are determined by both equations (4) and (5) above. Using these resistance values Ra and Rb, we can calculate the ideal change curve of the photoconductive element Cds so that the voltage Va changes linearly according to the brightness, as shown in Figure 3i with the vertical axis on a logarithmic scale. Resistance value A [KΩ] and C
The curve passes through [KΩ]. If we pay attention to the section between A and C of this curve, it is almost a straight line, and this section almost matches the brightness characteristics of the actual photoconductive element Cds.
またγ特性は、オペレーシヨンアンプOAが帰
還回路を構成することにより回路の帰還比
(R5/R4)で補正ができるので上述のA〜C間で
電圧Vaは輝度に対して十分な直線性が得られる。
すなわち輝度情報が等差数列的変化としてオペレ
ーシヨンアンプOAに入力できるのである。 In addition, the γ characteristic can be corrected by the feedback ratio (R 5 /R 4 ) of the circuit when the operation amplifier OA forms a feedback circuit, so the voltage Va between A and C described above has a sufficient linearity with respect to the brightness. You can get sex.
In other words, luminance information can be input to the operation amplifier OA as an arithmetic progression change.
一方、非反転入力側にも等差数列的に入力設定
情報が入力される。すなわちASA感度、駒数、
タングステン−デイライトフイルム変換(T−D
変換)、逆行補正BLCおよび露出レベルを任意に
微調整可能とするためのEVボリユームなどが設
定される。 On the other hand, input setting information is also input to the non-inverting input side in an arithmetic progression. In other words, ASA sensitivity, number of pieces,
Tungsten-Daylight Film Conversion (T-D
conversion), retrograde correction BLC, and EV volume to enable fine adjustment of the exposure level.
こうして輝度情報としての電圧Vaと、入力設
定情報としての電圧Vbとのそれぞれの独自の増
減に応じて、オペレーシヨンアンプOAの出力電
圧すなわち絞りF値が決定される。 In this way, the output voltage of the operation amplifier OA, that is, the aperture F value, is determined in accordance with the respective independent increases and decreases in the voltage Va as the brightness information and the voltage Vb as the input setting information.
なお出願人の実験によれば、8ミリシネカメラ
では十分対応できる範囲の連動範囲14 2/3EVを
得ることができた。 According to the applicant's experiments, it was possible to obtain an interlocking range of 14 2/3 EV, which is sufficiently compatible with an 8 mm cine camera.
また、オペレーシヨンアンプは非反転増幅回路
として用いられることにより露出メータを流れる
電流がアナログ量として制御されるので、特に8
ミリシネカメラのように常時露光量の制御が必要
な光学装置の露出演算において有用であり、フイ
ードバツク方式、光起電圧素子を使用する露出制
御用演算方式以外の方式である光導電素子プログ
ラムEE方式においても十分対応できる特性であ
る。 In addition, since the operation amplifier is used as a non-inverting amplifier circuit, the current flowing through the exposure meter is controlled as an analog quantity.
It is useful in the exposure calculation of optical devices such as millicine cameras that require constant exposure control, and is useful in the photoconductive element program EE method, which is a method other than the feedback method and the exposure control calculation method that uses photovoltaic elements. It is also a characteristic that can be fully accommodated.
以上のように本発明によれば、オペレーシヨン
アンプの一方の入力端子に、設定入力情報を与え
る抵抗およびスイツチ群を接続することにより、
駒数変換に限定がなく、非反転増幅回路のオペレ
ーシヨンアンプの出力端子に露出メータを接続す
ることにより電流をアナログ化することができる
ので、オペレーシヨンアンプの増幅作用で露出メ
ータの作動を容易に行なわせることができ、また
露出メータ端子に例えば露出警告回路のような附
属回路をつないでも光導電素子の直接ドライブの
ような露出演算に影響がないので附属回路に制限
がなく、さらにオペレーシヨンアンプに帰還抵抗
を接続したことにより、帰還比で直線線を補正で
き、また、光導電素子に直列の抵抗および並列の
抵抗を接続したことにより、等差数列の入力情報
が得られ、輝度特性が直線性である光導電素子を
利用できるので、入力回路部分を簡明にすること
ができる。
As described above, according to the present invention, by connecting a resistor and a switch group that provide setting input information to one input terminal of an operational amplifier,
There is no limit to the number of frames that can be converted, and the current can be converted to analog by connecting the exposure meter to the output terminal of the operation amplifier of the non-inverting amplifier circuit, making it easy to operate the exposure meter using the amplification effect of the operation amplifier. Furthermore, even if an auxiliary circuit, such as an exposure warning circuit, is connected to the exposure meter terminal, it will not affect the exposure calculation, such as direct drive of the photoconductive element, so there are no restrictions on the auxiliary circuit, and furthermore, there are no restrictions on the operation. By connecting a feedback resistor to the amplifier, a straight line can be corrected using the feedback ratio, and by connecting a resistor in series and a resistor in parallel to the photoconductive element, input information of an arithmetic progression can be obtained, and the brightness characteristics can be corrected. Since a photoconductive element having linearity can be used, the input circuit can be simplified.
第1図は本発明の装置の一実施例を示す回路
図、第2図は従来の装置の回路図、第3図,
,は特性図である。
Cds……光導電素子、M……露出メータ、OA
……オペレーシヨンアンプ、R1……抵抗、R5…
…帰還抵抗、Ra……直列の抵抗、Rb……並列の
抵抗、T,S5,S6…S10,S11,BLC……スイツ
チ。
Fig. 1 is a circuit diagram showing an embodiment of the device of the present invention, Fig. 2 is a circuit diagram of a conventional device, Fig. 3,
, is a characteristic diagram. Cds...Photoconductive element, M...Exposure meter, OA
...Operation amplifier, R 1 ...Resistor, R 5 ...
...Feedback resistance, Ra...Series resistance, Rb...Parallel resistance, T, S5 , S6 ... S10 , S11 , BLC...Switch.
Claims (1)
子との間に帰還抵抗が接続されたオペレーシヨン
アンプの一方の入力端子に光量を検出する光導電
素子の一端を接続し、かつ上記オペレーシヨンア
ンプの他方の入力端子に各種の設定入力情報を与
える抵抗およびスイツチ群を接続するとともに、
上記オペレーシヨンアンプの出力端子に露出メー
タを接続し、さらに上記光導電素子に直列の抵抗
と並列の抵抗とを接続したことを特徴とする露出
制御用演算装置。1 One end of a photoconductive element for detecting the amount of light is connected to one input terminal of an operational amplifier having two input terminals and a feedback resistor is connected between the inverting input terminal and the output terminal, and Connect the resistors and switches that provide various setting input information to the other input terminal of the amplifier, and
An exposure control arithmetic device, characterized in that an exposure meter is connected to the output terminal of the operation amplifier, and further a resistor in series and a resistor in parallel are connected to the photoconductive element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50074843A JPS51151131A (en) | 1975-06-19 | 1975-06-19 | Arithmetic unit for an exposure control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50074843A JPS51151131A (en) | 1975-06-19 | 1975-06-19 | Arithmetic unit for an exposure control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51151131A JPS51151131A (en) | 1976-12-25 |
| JPS638447B2 true JPS638447B2 (en) | 1988-02-23 |
Family
ID=13559002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50074843A Granted JPS51151131A (en) | 1975-06-19 | 1975-06-19 | Arithmetic unit for an exposure control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS51151131A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0594553U (en) * | 1992-05-20 | 1993-12-24 | 明立精機株式会社 | Vibration isolation device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5538336U (en) * | 1978-08-31 | 1980-03-12 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5127579B2 (en) * | 1973-04-02 | 1976-08-13 |
-
1975
- 1975-06-19 JP JP50074843A patent/JPS51151131A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0594553U (en) * | 1992-05-20 | 1993-12-24 | 明立精機株式会社 | Vibration isolation device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51151131A (en) | 1976-12-25 |
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