GB1250150A - - Google Patents

Info

Publication number
GB1250150A
GB1250150A GB1250150DA GB1250150A GB 1250150 A GB1250150 A GB 1250150A GB 1250150D A GB1250150D A GB 1250150DA GB 1250150 A GB1250150 A GB 1250150A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
pawl
ring
energization
electromagnet
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
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 filed Critical
Publication of GB1250150A publication Critical patent/GB1250150A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Cameras (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

1,250,150. Diaphragm control arrangements. PRONTOR-WERK ALFRED GAUTHIER G.m.b.H. March 24, 1970 [April 12, 1969], No.14093/70. Heading G2A. A diaphragm aperture defined by blades 2 is controlled by an electromagnet step-by-step mechanism 7 actuated by a pulse generator 8, an electric gate circuit 9 controlling the energization of the generator so that the step-by-step mechanism carries out a predetermined number of steps. On energization of the step-by-step mechanism, permanent magnet 6 pivots to swing like a pendulum, and pawl 5 mounted thereon meshes with saw-tooth like serrations 1a on diaphragm actuating ring 1 to rotate ring 1 one serration per pulse. The switching time of gate circuit 9 is controlled by an RC timing circuit consisting of capacitor C and a manually selected one of resistors R 1 -R n housed within a remote selector 10. When a change of diaphragm valve is required, push-button 14 is depressed to close switch S 4 to thus energize an electromagnet 11. Armature 12c mounted on lever 12 is thus attracted and pins 12a, 12b lift drive pawl 5 and locking pawl 13 to allow ring 1 to rotate to a minimum position under action of spring 4. Knob 10a is then rotated to a desired setting of pointer 20a, and an appropriate resistor R 1 -R n is bridged by contact 23. Switches S 2 , S 3 are interlocked with movement of lever 12. A tapered slot diaphragm plate may be used, and other forms of step-bystep mechanism are described.
GB1250150D 1969-04-12 1970-03-24 Expired GB1250150A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691918712 DE1918712A1 (en) 1969-04-12 1969-04-12 Automatic aperture control, especially for photographic and cinematographic apparatus

Publications (1)

Publication Number Publication Date
GB1250150A true GB1250150A (en) 1971-10-20

Family

ID=5731059

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1250150D Expired GB1250150A (en) 1969-04-12 1970-03-24

Country Status (4)

Country Link
JP (1) JPS495255B1 (en)
DE (1) DE1918712A1 (en)
FR (1) FR2037547A5 (en)
GB (1) GB1250150A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353703C3 (en) * 1973-10-26 1981-06-11 Agfa-Gevaert Ag, 5090 Leverkusen Photographic or cinematographic camera
JPS50106620A (en) * 1973-12-28 1975-08-22
JPS5075432A (en) * 1973-11-05 1975-06-20
JPS5081138A (en) * 1973-11-16 1975-07-01
JPS5146942A (en) * 1974-10-18 1976-04-22 West Electric Co PUROGURAMUS HATSUTA
JPS5146943A (en) * 1974-10-18 1976-04-22 West Electric Co PUROGURAMUS HATSUTA
JPS51128527A (en) * 1975-04-30 1976-11-09 West Electric Co Ltd Automatic exposure control camera
JPS5382955U (en) * 1976-12-11 1978-07-08

Also Published As

Publication number Publication date
JPS495255B1 (en) 1974-02-06
DE1918712A1 (en) 1971-01-21
FR2037547A5 (en) 1970-12-31

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Legal Events

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