JPS57179825A - Integration circuit of electronic shutter for camera - Google Patents

Integration circuit of electronic shutter for camera

Info

Publication number
JPS57179825A
JPS57179825A JP6631481A JP6631481A JPS57179825A JP S57179825 A JPS57179825 A JP S57179825A JP 6631481 A JP6631481 A JP 6631481A JP 6631481 A JP6631481 A JP 6631481A JP S57179825 A JPS57179825 A JP S57179825A
Authority
JP
Japan
Prior art keywords
switch
equation
output voltage
camera
capacitance
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
JP6631481A
Other languages
Japanese (ja)
Other versions
JPH0120728B2 (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 JP6631481A priority Critical patent/JPS57179825A/en
Publication of JPS57179825A publication Critical patent/JPS57179825A/en
Publication of JPH0120728B2 publication Critical patent/JPH0120728B2/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 the difference of reflection factors between the shutter screen surface and film surface of a camera at the time of direct photometry by equivalently changing the capacitance of an integrating capacitor at a prescribed time to alter the integral time constant. CONSTITUTION:Before exposure, both a trigger switch SW1 and a changeover switch SW2 are closed and the photocurrent (i) of a light receiving element PD flows through the switch SW1, so that charge is not accumulated in an integrating capacitor C1 (capacitance C). When the switch SW1 is opened at the start of exposure, the output voltage Vout of an operational amplifier OP1 is expressed as shown in the equation 1. When the switch SW2 is opened after a prescribed time T0, said output voltage Vout is expressed like the equation 2. Thus, voltage V1 shown in the equation 2 shows the output voltage just before the opening of the switch SW2 and the integral time constant is changed, compensating the difference of reflection factors between the shutter screen surface and film surface.
JP6631481A 1981-04-28 1981-04-28 Integration circuit of electronic shutter for camera Granted JPS57179825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6631481A JPS57179825A (en) 1981-04-28 1981-04-28 Integration circuit of electronic shutter for camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6631481A JPS57179825A (en) 1981-04-28 1981-04-28 Integration circuit of electronic shutter for camera

Publications (2)

Publication Number Publication Date
JPS57179825A true JPS57179825A (en) 1982-11-05
JPH0120728B2 JPH0120728B2 (en) 1989-04-18

Family

ID=13312236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6631481A Granted JPS57179825A (en) 1981-04-28 1981-04-28 Integration circuit of electronic shutter for camera

Country Status (1)

Country Link
JP (1) JPS57179825A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4550997A (en) * 1983-11-18 1985-11-05 Ricoh Company, Ltd. Automatic exposure control circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5320939U (en) * 1976-07-30 1978-02-22
JPS5333442U (en) * 1976-08-30 1978-03-23

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5320939B2 (en) * 1973-05-25 1978-06-29
JPS5154305A (en) * 1974-11-08 1976-05-13 Nippon Electric Co Yunitsutono tsuikahoshiki

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5320939U (en) * 1976-07-30 1978-02-22
JPS5333442U (en) * 1976-08-30 1978-03-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4550997A (en) * 1983-11-18 1985-11-05 Ricoh Company, Ltd. Automatic exposure control circuit

Also Published As

Publication number Publication date
JPH0120728B2 (en) 1989-04-18

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