JPS57100321A - Photometric circuit - Google Patents

Photometric circuit

Info

Publication number
JPS57100321A
JPS57100321A JP17676280A JP17676280A JPS57100321A JP S57100321 A JPS57100321 A JP S57100321A JP 17676280 A JP17676280 A JP 17676280A JP 17676280 A JP17676280 A JP 17676280A JP S57100321 A JPS57100321 A JP S57100321A
Authority
JP
Japan
Prior art keywords
circuit
photocurrent
output
integrating
capacitor
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
JP17676280A
Other languages
Japanese (ja)
Other versions
JPS6239886B2 (en
Inventor
Kazunori Mizogami
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical Co Ltd
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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP17676280A priority Critical patent/JPS57100321A/en
Priority to US06/325,728 priority patent/US4390258A/en
Priority to DE3149655A priority patent/DE3149655C2/en
Publication of JPS57100321A publication Critical patent/JPS57100321A/en
Publication of JPS6239886B2 publication Critical patent/JPS6239886B2/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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/18—Signals indicating condition of a camera member or suitability of light
    • 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

Abstract

PURPOSE:To obtain photocurrent information in real time during photometry by cascade-connecting a differentiating circuit inputted with the output of a circuit integrating the photocurrent generated in a photoelectric transducer directly with a capacitor to said circuit. CONSTITUTION:A differentiating circuit inputted with the output of an integrating circuit integrating the photocurrent generated in a photoelectric transducer directly with a capacitor is cascade-connected to said circuit, and the information corresponding to the above-mentioned photocurrent is obtained from the output of this differentiating circuit. For example, the photocurrent of a photoelectric transducer PD1 for photometry formed of a silicon photodiode is integrated with an integrating circuit consisting of an operational amplifier OP1 an an integrating capacitor C1, and the output thereof is processed with a differentiating circuit consisting of an operational amplifier OP2 and a logarithmic compression diode D1, whereby the output thereof is connected to a display device or the like and the obtaining of the photocurrent information in real time is made possible.
JP17676280A 1980-12-15 1980-12-15 Photometric circuit Granted JPS57100321A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP17676280A JPS57100321A (en) 1980-12-15 1980-12-15 Photometric circuit
US06/325,728 US4390258A (en) 1980-12-15 1981-11-30 Photomeric circuit for camera
DE3149655A DE3149655C2 (en) 1980-12-15 1981-12-15 Light measuring circuit for a camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17676280A JPS57100321A (en) 1980-12-15 1980-12-15 Photometric circuit

Publications (2)

Publication Number Publication Date
JPS57100321A true JPS57100321A (en) 1982-06-22
JPS6239886B2 JPS6239886B2 (en) 1987-08-25

Family

ID=16019360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17676280A Granted JPS57100321A (en) 1980-12-15 1980-12-15 Photometric circuit

Country Status (1)

Country Link
JP (1) JPS57100321A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02110568U (en) * 1988-04-18 1990-09-04

Also Published As

Publication number Publication date
JPS6239886B2 (en) 1987-08-25

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