GB1163768A - Improvements in or relating to Exposure Control System for Photographic Cameras - Google Patents

Improvements in or relating to Exposure Control System for Photographic Cameras

Info

Publication number
GB1163768A
GB1163768A GB44012/66A GB4401266A GB1163768A GB 1163768 A GB1163768 A GB 1163768A GB 44012/66 A GB44012/66 A GB 44012/66A GB 4401266 A GB4401266 A GB 4401266A GB 1163768 A GB1163768 A GB 1163768A
Authority
GB
United Kingdom
Prior art keywords
bridge
resistor
coil
july
photo
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
GB44012/66A
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.)
Nidec Copal Corp
Koparu KK
Original Assignee
Nidec Copal Corp
Koparu KK
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 Nidec Copal Corp, Koparu KK filed Critical Nidec Copal Corp
Publication of GB1163768A publication Critical patent/GB1163768A/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

Abstract

1,163,768. Exposure control for cameras. KORARU K.K. Oct. 3, 1966 [Nov. 6, 1965; May 27, 1966; July 12, 1966; July 13, 1966; July 14, 1966; July 19, 1966], No. 44012/66. Heading G2A. An automatic exposure control for photographic and cinematographic cameras includes a Wheatstone bridge network included in a transistorized control circuit, one branch of the bridge circuit including a photo-resistor subjected to scene light through the objective lens, such that unbalance of the bridge causes an electromagnetic device, to actuate a diaphragm control to restore the balance. As shown, a photo-resistor 10, Fig. 1, receives light through lens 2, diaphragm 7 and lens 8. The photo-resistor 10 is included in one branch of a bridge circuit Fig. 4 (not shown), such that on a change of incident light on the photo-resistor the bridge is unbalanced between points (A and B). The bridge also includes a variable resistor (25) which is set according to the emulsion speed of the film 12, Fig. 1, and a resistor (27, Fig. 4, not shown) for setting shutter speed. Upon unbalance of the bridge circuit current flows through an energizing coil (L1) in the direction of the dotted line, thus causing rotation of coil 16, Fig. 3, which adjusts diaphragm 7. The coil 16 also carries a damping coil Lz which upon rotation generates a voltage of opposite polarity to that between points (A and B) Fig. 4 (not shown) of the bridge circuit. The damping coil L2 is stated to provide a constant current flow through the energizing coil L 1 to provide a constant speed movement and instantaneous stopping thereof when the bridge becomes balanced.
GB44012/66A 1965-11-06 1966-10-03 Improvements in or relating to Exposure Control System for Photographic Cameras Expired GB1163768A (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP6817265 1965-11-06
JP3412866 1966-05-27
JP4554066 1966-07-12
JP6634066 1966-07-13
JP6667166 1966-07-14
JP6837266 1966-07-19

Publications (1)

Publication Number Publication Date
GB1163768A true GB1163768A (en) 1969-09-10

Family

ID=27549716

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44012/66A Expired GB1163768A (en) 1965-11-06 1966-10-03 Improvements in or relating to Exposure Control System for Photographic Cameras

Country Status (4)

Country Link
US (1) US3461786A (en)
CH (1) CH463268A (en)
DE (1) DE1522146C3 (en)
GB (1) GB1163768A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1797443A1 (en) * 1968-09-28 1970-12-23 Zeiss Ikon Ag Photographic camera with automatic aperture control
US3747487A (en) * 1969-04-17 1973-07-24 Canon Kk An exposure control system for a photographic system
BE759092A (en) * 1969-11-19 1971-05-18 Polaroid Corp AUTOMATIC COMPENSATION PHOTOGRAPHIC CAMERA
US3732797A (en) * 1970-01-09 1973-05-15 Canon Kk Diaphragm device for a camera
DE2049110C2 (en) * 1970-10-06 1975-02-06 Agfa-Gevaert Ag, 5090 Leverkusen Exposure control device for a photographic camera
US3818494A (en) * 1971-07-08 1974-06-18 Canon Kk Exposure control device
US4609273A (en) * 1985-07-11 1986-09-02 Nippon Seimitsu Kogyo Kabushiki Kaisha Iris diaphragm device for a camera

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1047379A (en) *
FR1333253A (en) * 1962-07-03 1963-07-26 Photographic or cinematographic camera
US3197783A (en) * 1962-09-18 1965-07-27 Keystone Camera Company Inc Electric camera control apparatus
US3230847A (en) * 1963-02-25 1966-01-25 Flight Res Inc Automatic exposure control systems for cameras

Also Published As

Publication number Publication date
US3461786A (en) 1969-08-19
DE1522146C3 (en) 1975-06-19
DE1522146A1 (en) 1971-12-09
CH463268A (en) 1968-09-30

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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