JPS56117221A - Control circuit of servo aperture device - Google Patents

Control circuit of servo aperture device

Info

Publication number
JPS56117221A
JPS56117221A JP2136680A JP2136680A JPS56117221A JP S56117221 A JPS56117221 A JP S56117221A JP 2136680 A JP2136680 A JP 2136680A JP 2136680 A JP2136680 A JP 2136680A JP S56117221 A JPS56117221 A JP S56117221A
Authority
JP
Japan
Prior art keywords
drops below
difference
prescribed value
voltage
switch
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.)
Pending
Application number
JP2136680A
Other languages
Japanese (ja)
Inventor
Tomio Kurosu
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.)
Nidec Copal Corp
Original Assignee
Nidec Copal 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 Nidec Copal Corp filed Critical Nidec Copal Corp
Priority to JP2136680A priority Critical patent/JPS56117221A/en
Publication of JPS56117221A publication Critical patent/JPS56117221A/en
Pending 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
    • G03B7/085—Analogue circuits for control of aperture

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

PURPOSE:To reduce the power consumption of a power battery, by releasing a servomotor driving circuit when a difference between a reference voltage and photometric voltage drops below a prescribed value. CONSTITUTION:Voltage V1 of the negative line of power battery E and voltage V2 to be controlled varying with the diameter of aperture F coupling with servomotor M1 are compared OP3 mutually and until the difference between the both drops below a prescribed value, motor M1 is put in operation to exercise control over the aperture diameter. Then, once the difference drops below the prescribed value, switch S1 interposed in the driving circuit for motor M1 is opened. Relay Ry1 operating switch S1 is provided with the delay circuit consisting of resistance R5 and capacitor C and then switch S1 is opened a prescribed delay time after the difference drops below the prescribed value.
JP2136680A 1980-02-22 1980-02-22 Control circuit of servo aperture device Pending JPS56117221A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2136680A JPS56117221A (en) 1980-02-22 1980-02-22 Control circuit of servo aperture device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2136680A JPS56117221A (en) 1980-02-22 1980-02-22 Control circuit of servo aperture device

Publications (1)

Publication Number Publication Date
JPS56117221A true JPS56117221A (en) 1981-09-14

Family

ID=12053090

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2136680A Pending JPS56117221A (en) 1980-02-22 1980-02-22 Control circuit of servo aperture device

Country Status (1)

Country Link
JP (1) JPS56117221A (en)

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