JPS57104824A - Reflectophotometer - Google Patents

Reflectophotometer

Info

Publication number
JPS57104824A
JPS57104824A JP55181522A JP18152280A JPS57104824A JP S57104824 A JPS57104824 A JP S57104824A JP 55181522 A JP55181522 A JP 55181522A JP 18152280 A JP18152280 A JP 18152280A JP S57104824 A JPS57104824 A JP S57104824A
Authority
JP
Japan
Prior art keywords
capacitor
center
shutter screen
screen
compensate
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
JP55181522A
Other languages
Japanese (ja)
Inventor
Kazunori Mizogami
Masahiro Kitagawa
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 JP55181522A priority Critical patent/JPS57104824A/en
Publication of JPS57104824A publication Critical patent/JPS57104824A/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To compensate for changes in measuring condition owing to a difference between the shutter screen and a film using a simple time constant circuit. CONSTITUTION:A capacitor 38 starts charging timed for initial running of a shutter screen. Being center-oriented measurement, a photo diode 10 measures a reflected light from the shutter screen untill the screen reaches the center of the picture. Consequently, the terminal voltage of the capacitor 38 rises at a fixed rate. As the shutter screen runs to the center of the picture, the reflected light from a film enters the photo diode 10 causing a sharp increase in the light current. But, at the same time, a capacitor 26 starts charging to compensate for the sharp increase in the light current. This can maintain the voltage between the base and the emitter of a transistor 32 thereby preventing changes in the measuring condition.
JP55181522A 1980-12-22 1980-12-22 Reflectophotometer Pending JPS57104824A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55181522A JPS57104824A (en) 1980-12-22 1980-12-22 Reflectophotometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55181522A JPS57104824A (en) 1980-12-22 1980-12-22 Reflectophotometer

Publications (1)

Publication Number Publication Date
JPS57104824A true JPS57104824A (en) 1982-06-30

Family

ID=16102226

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55181522A Pending JPS57104824A (en) 1980-12-22 1980-12-22 Reflectophotometer

Country Status (1)

Country Link
JP (1) JPS57104824A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127382A (en) * 1974-07-02 1976-03-06 Olympus Optical Co

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127382A (en) * 1974-07-02 1976-03-06 Olympus Optical Co

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