GB1376080A - Exposure-determing device for a camera - Google Patents

Exposure-determing device for a camera

Info

Publication number
GB1376080A
GB1376080A GB564072A GB564072A GB1376080A GB 1376080 A GB1376080 A GB 1376080A GB 564072 A GB564072 A GB 564072A GB 564072 A GB564072 A GB 564072A GB 1376080 A GB1376080 A GB 1376080A
Authority
GB
United Kingdom
Prior art keywords
voltage
transistor
light
intensity
collector current
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.)
Expired
Application number
GB564072A
Other languages
English (en)
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB1376080A publication Critical patent/GB1376080A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/48—Analogue computers for specific processes, systems or devices, e.g. simulators
    • 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
    • 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
    • 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/58—Means for varying duration of "open" period of shutter
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/24—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating logarithmic or exponential functions, e.g. hyperbolic functions

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Software Systems (AREA)
  • Exposure Control For Cameras (AREA)
GB564072A 1971-02-27 1972-02-07 Exposure-determing device for a camera Expired GB1376080A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1009571 1971-02-27

Publications (1)

Publication Number Publication Date
GB1376080A true GB1376080A (en) 1974-12-04

Family

ID=11740755

Family Applications (1)

Application Number Title Priority Date Filing Date
GB564072A Expired GB1376080A (en) 1971-02-27 1972-02-07 Exposure-determing device for a camera

Country Status (3)

Country Link
US (1) US3781551A (enExample)
FR (1) FR2126438B1 (enExample)
GB (1) GB1376080A (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS581403B2 (ja) * 1973-06-23 1983-01-11 ミノルタ株式会社 光起電力素子を用いた自動露出時間制御回路
JPS5611930B2 (enExample) * 1973-10-09 1981-03-18
JPS5922167B2 (ja) * 1975-04-25 1984-05-24 旭光学工業 （株） 測光・演算回路
US4180310A (en) * 1975-04-25 1979-12-25 Asahi Kogaku Kogyo Kabushiki Kaisha Photometric circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4821854Y1 (enExample) * 1970-05-21 1973-06-26

Also Published As

Publication number Publication date
FR2126438B1 (enExample) 1977-01-14
US3781551A (en) 1973-12-25
DE2209074A1 (de) 1972-09-14
FR2126438A1 (enExample) 1972-10-06
DE2209074B2 (de) 1973-08-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PE20 Patent expired after termination of 20 years