JPS57200018A - Aperture adjusting device of camera - Google Patents

Aperture adjusting device of camera

Info

Publication number
JPS57200018A
JPS57200018A JP56085364A JP8536481A JPS57200018A JP S57200018 A JPS57200018 A JP S57200018A JP 56085364 A JP56085364 A JP 56085364A JP 8536481 A JP8536481 A JP 8536481A JP S57200018 A JPS57200018 A JP S57200018A
Authority
JP
Japan
Prior art keywords
aperture
diaphragm
circuit
value
voltage
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
JP56085364A
Other languages
Japanese (ja)
Other versions
JPH038527B2 (en
Inventor
Tadashi Eshiya
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP56085364A priority Critical patent/JPS57200018A/en
Publication of JPS57200018A publication Critical patent/JPS57200018A/en
Publication of JPH038527B2 publication Critical patent/JPH038527B2/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
    • G03B7/091—Digital circuits
    • G03B7/095—Digital circuits for control of aperture

Landscapes

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

Abstract

PURPOSE:To stabilize diaphragm operation by setting an aperture value by the count value of a counter, and then providing a circuit which makes variation in the quantity of light per unit bit constant when converting the count value into the aperture value. CONSTITUTION:The aperture value of a diaphragm 2 provided to an image pickup tube 1 is adjusted by adjusting the size of an aperture 4 by rotating aperture blades by a motor 3 for aperture adjustment. Simultaneously, the slider 11 of a variable resistor 10 slides by coupling with the diaphragm 2. For automatic aperture adjustment, a switch 5 is opened and a switch 6 is closed. The output video signal of the image pickup tube 1 is sent through a preamplifier 7 to a trailing signal processing circuit, and a detecting circuit 8 detects the signal level. The detected voltage of the detecting circuit 8 is applied to a voltage comparing circuit 9, which compares the input with a reference voltage Vs. Its comparison voltage controls the motor 3 through a diode D2 to hold the aperture value of the diaphragm 2 constant according to the signal level.
JP56085364A 1981-06-03 1981-06-03 Aperture adjusting device of camera Granted JPS57200018A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56085364A JPS57200018A (en) 1981-06-03 1981-06-03 Aperture adjusting device of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56085364A JPS57200018A (en) 1981-06-03 1981-06-03 Aperture adjusting device of camera

Publications (2)

Publication Number Publication Date
JPS57200018A true JPS57200018A (en) 1982-12-08
JPH038527B2 JPH038527B2 (en) 1991-02-06

Family

ID=13856651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56085364A Granted JPS57200018A (en) 1981-06-03 1981-06-03 Aperture adjusting device of camera

Country Status (1)

Country Link
JP (1) JPS57200018A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03179879A (en) * 1989-07-18 1991-08-05 Fuji Photo Film Co Ltd Method and apparatus for exposure control of video camera

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5611442A (en) * 1979-07-06 1981-02-04 Kyocera Corp Detecting circuit for stoppage of stopping-down in exposure control unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5611442A (en) * 1979-07-06 1981-02-04 Kyocera Corp Detecting circuit for stoppage of stopping-down in exposure control unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03179879A (en) * 1989-07-18 1991-08-05 Fuji Photo Film Co Ltd Method and apparatus for exposure control of video camera

Also Published As

Publication number Publication date
JPH038527B2 (en) 1991-02-06

Similar Documents

Publication Publication Date Title
JPS57200017A (en) Aperture locking device
US4309089A (en) Exposure indicating apparatus responsive to film exposure latitude
JPS57200018A (en) Aperture adjusting device of camera
US3605001A (en) Servo-controlled camera diaphragm including a unique dither circuit
CA2066022A1 (en) Exposure control apparatus of camera
JPS5662231A (en) Control device for diaphragm of camera
US3523740A (en) Circuit for measuring light flux of flashes of light
JPS57200019A (en) Aperture locking device
JPS5740212A (en) Automatic focusing apparatus
US3643563A (en) Shutter-timing network
GB1464769A (en) Automaitc exposure control systems and light metering systems for cameras
US4146318A (en) Automatic diaphragm control
CA2066014A1 (en) Exposure control apparatus of camera
GB1288548A (en)
US4449803A (en) Indicating apparatus for electronic flash system of TTL light measurement type
US4331401A (en) Exposure control system for a photographic camera
US3605600A (en) Combination warning and shutter timing circuit
JPS6482773A (en) Automatic focusing device
JPH01271731A (en) Camera with automatic exposer
US4457606A (en) Motor drive unit for camera
JPS57120926A (en) Copying machine for microfilm
JPS6210752Y2 (en)
JPS5641700A (en) X-ray penetrative photographying device
JPH0243128B2 (en)
JPS5617577A (en) Video camera