JPS5793327A - Electronic shutter integration circuit - Google Patents

Electronic shutter integration circuit

Info

Publication number
JPS5793327A
JPS5793327A JP17059180A JP17059180A JPS5793327A JP S5793327 A JPS5793327 A JP S5793327A JP 17059180 A JP17059180 A JP 17059180A JP 17059180 A JP17059180 A JP 17059180A JP S5793327 A JPS5793327 A JP S5793327A
Authority
JP
Japan
Prior art keywords
operational amplifier
condition setting
amplifier
voltage
error
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
Application number
JP17059180A
Other languages
Japanese (ja)
Other versions
JPH0140333B2 (en
Inventor
Toshihide Miyake
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP17059180A priority Critical patent/JPS5793327A/en
Publication of JPS5793327A publication Critical patent/JPS5793327A/en
Publication of JPH0140333B2 publication Critical patent/JPH0140333B2/ja
Granted legal-status Critical Current

Links

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
    • G03B7/083—Analogue circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To compensate an intial condition setting error, an offset error, etc., by controlling a switching element for connecting both amplifiers through an operational amplifier for inputting an output of a light quantity integrating operational amplifier, and reference voltage. CONSTITUTION:One of the output of a light quantity integrating operational amplifier 3 to which a photoconductive body 8, etc. of a photodiode, etc. for detecting the brightness of an object to be photographed are connected is provided to the second operational amplifier 2. Through this amplifier 2, a switching element 7 such as a PNP transistor, etc. between the amplifiers 2, 3, and occurrence of an initial condition setting error causing a variation of voltage of a capacitor 9 by residual saturation voltage operated in case when the element 7 has been directly connected to an electric power supply 1 is prevented. Also, as for the amplifier 2, since it is unnecessary to raise the input impedance, when it is constituted by use of a bipolar transistor, the offset voltage becomes small enough. Accordingly, it is possible to obtain an integration circuit which is capable of substantially compensate the initial condition setting error, the offset error, etc.
JP17059180A 1980-12-02 1980-12-02 Electronic shutter integration circuit Granted JPS5793327A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17059180A JPS5793327A (en) 1980-12-02 1980-12-02 Electronic shutter integration circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17059180A JPS5793327A (en) 1980-12-02 1980-12-02 Electronic shutter integration circuit

Publications (2)

Publication Number Publication Date
JPS5793327A true JPS5793327A (en) 1982-06-10
JPH0140333B2 JPH0140333B2 (en) 1989-08-28

Family

ID=15907670

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17059180A Granted JPS5793327A (en) 1980-12-02 1980-12-02 Electronic shutter integration circuit

Country Status (1)

Country Link
JP (1) JPS5793327A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5893918U (en) * 1981-12-18 1983-06-25 オリンパス光学工業株式会社 camera photometry device
JPH01238633A (en) * 1988-03-19 1989-09-22 Sharp Corp Integrating circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5893918U (en) * 1981-12-18 1983-06-25 オリンパス光学工業株式会社 camera photometry device
JPH036894Y2 (en) * 1981-12-18 1991-02-21
JPH01238633A (en) * 1988-03-19 1989-09-22 Sharp Corp Integrating circuit
JP2667673B2 (en) * 1988-03-19 1997-10-27 シャープ株式会社 Integrator circuit

Also Published As

Publication number Publication date
JPH0140333B2 (en) 1989-08-28

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