GB1402026A – Photographic cameras
– Google Patents
GB1402026A – Photographic cameras
– Google Patents
Photographic cameras
Info
Publication number
GB1402026A
GB1402026A
GB4259372A
GB4259372A
GB1402026A
GB 1402026 A
GB1402026 A
GB 1402026A
GB 4259372 A
GB4259372 A
GB 4259372A
GB 4259372 A
GB4259372 A
GB 4259372A
GB 1402026 A
GB1402026 A
GB 1402026A
Authority
GB
United Kingdom
Prior art keywords
photo
conductor
exposure
shutter
timing
Prior art date
1971-09-13
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
GB4259372A
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.)
1971-09-13
Filing date
1972-09-13
Publication date
1975-08-06
1972-09-13
Application filed by Eastman Kodak Co
filed
Critical
Eastman Kodak Co
1975-08-06
Publication of GB1402026A
publication
Critical
patent/GB1402026A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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
G03B7/003—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly setting of both shutter and diaphragm
Abstract
1402026 Exposure control circuit EASTMAN KODAK CO 13 Sept 1972 [13 Sept 1971] 42593/72 Heading G2A An exposure control circuit includes a lamp 222 which is lit if subject brightness is such that a flash or tripod exposure is required and is extinguished when the shutter closes to indicate the termination of exposure. On closing switch S’ 1 a trigger circuit 218 is switched on to light lamp 222 if the illumination of a photo-conductor 202 is low. When a shutter opening blade (44), Fig.1 (not shown) is released a timing switch S’ 2 is opened, a timing capacitor 200 charges up, and switches off a trigger circuit 192 which de-energizes a coil 194 to release a shutter closing blade (46), and switches off trigger circuit 218 to extinguish lamp 222. The charging of timing capacitor 200 is controlled by a photo-conductor 198 and, if flash is used, by resistors 226 and 230 selected according to object distance. In Fig.2 (not shown), a photo-conductor (102) corresponding to photo-conductor 202 automatically sets a diaphragm aperture (25), Fig.1, via a differential amplifier (110) and an electromagnet (36) and correspondingly adjusts an aperture (29) located before the photo-conductor (102) and a shutter timing photo-conductor (98). At the end of exposure the apertures (25, 29) are automatically reduced to their minimum values.
GB4259372A
1971-09-13
1972-09-13
Photographic cameras
Expired
GB1402026A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US18003871A
1971-09-13
1971-09-13
Publications (1)
Publication Number
Publication Date
GB1402026A
true
GB1402026A
(en)
1975-08-06
Family
ID=22658976
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4259372A
Expired
GB1402026A
(en)
1971-09-13
1972-09-13
Photographic cameras
Country Status (7)
Country
Link
US
(1)
US3748974A
(en)
JP
(1)
JPS4857627A
(en)
DE
(1)
DE2264789A1
(en)
FR
(1)
FR2153981A5
(en)
GB
(1)
GB1402026A
(en)
HK
(1)
HK15876A
(en)
MY
(1)
MY7600060A
(en)
Families Citing this family (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE2649674A1
(en)
*
1976-10-29
1978-05-03
Agfa Gevaert Ag
PHOTOGRAPHIC CAMERA WITH PROGRAM SHUTTER
US4192587A
(en)
*
1978-11-13
1980-03-11
Polaroid Corporation
Proportional fill flash
US4291959A
(en)
*
1980-11-21
1981-09-29
Eastman Kodak Company
Photographic apparatus
US4470684A
(en)
*
1983-04-11
1984-09-11
Eastman Kodak Company
Energy efficient charging apparatus for an electronic flash
1971
1971-09-13
US
US00180038A
patent/US3748974A/en
not_active
Expired – Lifetime
1972
1972-09-11
JP
JP47090520A
patent/JPS4857627A/ja
active
Pending
1972-09-11
DE
DE2264789A
patent/DE2264789A1/en
active
Pending
1972-09-13
GB
GB4259372A
patent/GB1402026A/en
not_active
Expired
1972-09-13
FR
FR7232368A
patent/FR2153981A5/fr
not_active
Expired
1976
1976-03-18
HK
HK158/76*UA
patent/HK15876A/en
unknown
1976-12-30
MY
MY60/76A
patent/MY7600060A/en
unknown
Also Published As
Publication number
Publication date
FR2153981A5
(en)
1973-05-04
DE2264789A1
(en)
1974-12-05
DE2244507B2
(en)
1977-03-10
DE2244507A1
(en)
1973-04-12
HK15876A
(en)
1976-03-26
US3748974A
(en)
1973-07-31
MY7600060A
(en)
1976-12-31
JPS4857627A
(en)
1973-08-13
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(en)
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(en)
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(en)
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Legal Events
Date
Code
Title
Description
1975-12-17
PS
Patent sealed [section 19, patents act 1949]
1981-04-08
PCNP
Patent ceased through non-payment of renewal fee
