GB1294074A - Camera exposure control - Google Patents

Camera exposure control

Info

Publication number
GB1294074A
GB1294074A GB100170A GB100170A GB1294074A GB 1294074 A GB1294074 A GB 1294074A GB 100170 A GB100170 A GB 100170A GB 100170 A GB100170 A GB 100170A GB 1294074 A GB1294074 A GB 1294074A
Authority
GB
United Kingdom
Prior art keywords
diode
photo
jan
exposure control
spring
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
GB100170A
Inventor
Allen Gwyn Stimson
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB1294074A publication Critical patent/GB1294074A/en
Expired 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
    • 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
    • G03B19/00—Cameras
    • G03B19/18—Motion-picture cameras

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Stroboscope Apparatuses (AREA)

Abstract

1294074 Photographic exposure controls EASTMAN KODAK CO. 8 Jan 1970 [9 Jan 1969] 1001/70 Heading G2A An exposure control device of a camera had an avalanche photo-diode 7 exposed to scene illumination through a diaphragm slot 4 of a rotary diaphragm plate 5 having a second slot 6 in the optical path to a film 3. The photo-diode 7 is in circuit with a transistor 8 that conduct's to energize a trainsducer 9 which produces a counter clockwise rotation of the diaphragm plate 7 against the action of a spring 12. The plate 5 oscillates at a high frequency when the device is balanced, such that the photo-diode 7 is alternately illuminated above and below the level where it conducts. In a modification Fig. 2 (not shown) the spring 12 is dispensed with by using a dual coil having oppositely poled windings (9<SP>1</SP> and 9<SP>2</SP>) each transducer connected to separate transistors
GB100170A 1969-01-09 1970-01-08 Camera exposure control Expired GB1294074A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79003669A 1969-01-09 1969-01-09

Publications (1)

Publication Number Publication Date
GB1294074A true GB1294074A (en) 1972-10-25

Family

ID=25149454

Family Applications (1)

Application Number Title Priority Date Filing Date
GB100170A Expired GB1294074A (en) 1969-01-09 1970-01-08 Camera exposure control

Country Status (3)

Country Link
DE (1) DE2000558A1 (en)
FR (1) FR2027994A1 (en)
GB (1) GB1294074A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9106127D0 (en) * 1991-03-22 1991-05-08 Byrne Charles M Spread
CN105206145B (en) * 2015-10-27 2018-02-02 新乡医学院 One kind claps generator

Also Published As

Publication number Publication date
FR2027994A1 (en) 1970-10-02
DE2000558A1 (en) 1970-09-17

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees