GB1391293A - Photographic exposure control apparatus - Google Patents

Photographic exposure control apparatus

Info

Publication number
GB1391293A
GB1391293A GB1796673A GB1796673A GB1391293A GB 1391293 A GB1391293 A GB 1391293A GB 1796673 A GB1796673 A GB 1796673A GB 1796673 A GB1796673 A GB 1796673A GB 1391293 A GB1391293 A GB 1391293A
Authority
GB
United Kingdom
Prior art keywords
shutter
switch
firing circuit
energize
solenoid
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
GB1796673A
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.)
Polaroid Corp
Original Assignee
Polaroid 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 Polaroid Corp filed Critical Polaroid Corp
Publication of GB1391293A publication Critical patent/GB1391293A/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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0452—Electrical ignition means connected to the shutter
    • 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
    • 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
    • G03B7/091—Digital circuits
    • 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
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Shutters For Cameras (AREA)

Abstract

1391293 Cameras POLAROID CORP 13 April 1973 [24 April 1972 16 Feb 1973] 17966/73 Heading G2A A camera has a switch S4 connected to a flash firing circuit 476 and arranged to be opened before and after exposure to prevent flash-lamps from being triggered by spurious signals e.g. from operation of an electric motor used in a self-processing reflex camera to raise the reflex mirror and drive the processing rollers. On depressing the release button, a solenoid 172 is energized to close shutter blades (140, 142,) Fig.2, (not shown), the blade movement changing over S4 to disable firing circuit 476 and energize a motor to raise a reflex mirror (50). Mirror movement opens a switch S5, which energizes a solenoid 240 if a flash assembly (234) has been attached, and opens a switch S3 to de-energize the solenoid 172 whereby the shutter starts to open, blade movement changing over S4 to energize the firing circuit 476. If scene illumination is high a photo-electric firing circuit times out and closes the shutter. Otherwise the blades open to a valve dependent on the focusing of the objective, and solenoid 240 is de-energized to send a pulse 570 (Fig.14) to switch an SCR 566a on. This fires a lamp 552a producing a signal on line 558 which operates a switch 444 to suppress photo-electric control and charges a capacitor 546, which eventually operates a trigger 358 to close the shutter. Shutter closure changes over S4 again to disable firing circuit 476 and to energize the motor to process the exposed film unit and cock the reflex mirror (50). A safety timer (580), Fig.8 (not shown) closes the shutter after a pre- determined time if the other timers fail.
GB1796673A 1972-04-24 1973-04-13 Photographic exposure control apparatus Expired GB1391293A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24689172A 1972-04-24 1972-04-24
US00333331A US3820128A (en) 1972-04-24 1973-02-16 Flash photographic control system

Publications (1)

Publication Number Publication Date
GB1391293A true GB1391293A (en) 1975-04-23

Family

ID=26938305

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1796673A Expired GB1391293A (en) 1972-04-24 1973-04-13 Photographic exposure control apparatus

Country Status (3)

Country Link
US (1) US3820128A (en)
FR (1) FR2226075A5 (en)
GB (1) GB1391293A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005449A (en) * 1973-12-13 1977-01-25 Polaroid Corporation Flash photographic system with camera inhibit feature
US3896459A (en) * 1974-05-29 1975-07-22 Honeywell Inc Control circuit for an automatic photographic camera
US4008481A (en) * 1975-10-03 1977-02-15 Polaroid Corporation Exposure control system with separate flash and ambient trigger levels
US4023187A (en) * 1975-10-03 1977-05-10 Polaroid Corporation Exposure control system with fill flash race condition
US4017873A (en) * 1975-10-03 1977-04-12 Polaroid Corporation Exposure control system with braking capability
GB1566893A (en) * 1976-01-13 1980-05-08 Polaroid Corp Photographic shutter control apparatus
US4017876A (en) * 1976-01-13 1977-04-12 Polaroid Corporation Shutter latch system with automatic release for shock damping member
US4182561A (en) * 1978-08-03 1980-01-08 Polaroid Corporation Fast charging electronic flash device
US4185144A (en) * 1978-09-05 1980-01-22 Polaroid Corporation Electrochemical cell with a cadmium patch electrode
US4184756A (en) * 1978-10-13 1980-01-22 Polaroid Corporation Strobe without primary storage capacitor
US4291964A (en) * 1980-01-28 1981-09-29 Polaroid Corporation Strobe switch with camera control feature

Also Published As

Publication number Publication date
FR2226075A5 (en) 1974-11-08
US3820128A (en) 1974-06-25

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee