GB1297012A – – Google Patents
GB1297012A – – Google Patents
Info
Publication number
GB1297012A
GB1297012A
GB1297012DA
GB1297012A
GB 1297012 A
GB1297012 A
GB 1297012A
GB 1297012D A
GB1297012D A
GB 1297012DA
GB 1297012 A
GB1297012 A
GB 1297012A
Authority
GB
United Kingdom
Prior art keywords
lamp
light
wedge
exposure time
intensity
Prior art date
1969-02-06
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.)
1969-02-06
Filing date
1970-01-27
Publication date
1972-11-22
1969-02-06
Priority claimed from DE19691905842
external-priority
patent/DE1905842C/en
1970-01-27
Application filed
filed
Critical
1972-11-22
Publication of GB1297012A
publication
Critical
patent/GB1297012A/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
G03B7/083—Analogue circuits for control of exposure time
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
G03B17/00—Details of cameras or camera bodies; Accessories therefor
G03B17/18—Signals indicating condition of a camera member or suitability of light
G03B17/20—Signals indicating condition of a camera member or suitability of light visible in viewfinder
Abstract
1297012 Photographic cameras AGFAGEVAERT AG 27 Jan 1970 [6 Feb 1969] 3925/70 Heading G2A A photographic camera having a meterless electronic shutter speed control which controls exposure time in accordance with prevailing illumination has a lamp 2 the light output of which varies with the expected exposure time, as indicated on a scale 4, located for viewing adjacent a light alternating element 3 such as a wedge. A light conducting bar 1 is provided within a view finder (not shown), and adjacent the lamp 2. The scale 4, calibrated with exposure times, is illuminated by means of a lamp 5. A photo-resistor 10 is connected through a switch 8, 9 to the lamp 2 or a trigger circuit which operates the camera shutter (not shown) through a relay in accordance with the prevailing illumination detected by photo-resistor 10. A brightness band is visible on the wedge dependent on the brightness of the lamp 2, the border of the band between light and dark indicating the expected exposure time. In a modification, Fig.3 (not shown) a glass plate (23) provided with interference layers is used in place of the wedge. The plate is positioned adjacent a lamp (26) and light conducting bar 25 to illuminate one side of the plate at constant intensity so that at the region where the lamp (26) is of greater intensity than lamp (2) a different colour is seen than where the intensity of lamp (2) exceeds lamp (26).
GB1297012D
1969-02-06
1970-01-27
Expired
GB1297012A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DE19691905842
DE1905842C
(en)
1969-02-06
Photographic camera with an electronic exposure control device
Publications (1)
Publication Number
Publication Date
GB1297012A
true
GB1297012A
(en)
1972-11-22
Family
ID=5724488
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1297012D
Expired
GB1297012A
(en)
1969-02-06
1970-01-27
Country Status (3)
Country
Link
US
(1)
US3599545A
(en)
FR
(1)
FR2037346A5
(en)
GB
(1)
GB1297012A
(en)
Families Citing this family (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4441096A
(en)
*
1980-06-23
1984-04-03
California Institute Of Technology
Optical analog-to-digital converter
AU542778B2
(en)
*
1980-11-13
1985-03-14
Commonwealth Of Australia, The
Visibility gauge
US4712089A
(en)
*
1985-10-11
1987-12-08
Battelle Memorial Institute
All-optical A/D conversion using integrated nonlinear guided wave optical circuitry
US5349416A
(en)
*
1990-09-04
1994-09-20
Nikon Corporation
Display apparatus
Family Cites Families (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2163205A
(en)
*
1935-11-23
1939-06-20
Leber Alois
Optical light exposure meter
US2195640A
(en)
*
1938-03-24
1940-04-02
Joseph M Bing
Photographic exposure meter
US2354545A
(en)
*
1943-07-08
1944-07-25
Rath Karl
Optical exposure meter
US2771000A
(en)
*
1954-05-19
1956-11-20
George D Creelman
Grease spot photometer
DE1472663A1
(en)
*
1964-10-27
1969-04-24
Yashica Co Ltd
Automatic exposure time controller with display of exposure brightness limits
US3532035A
(en)
*
1966-12-24
1970-10-06
Minolta Camera Kk
Photoelectric photometer
CH467445A
(en)
*
1967-02-25
1969-01-15
Gossen & Co Gmbh P
Photoelectric light meter
1970
1970-01-27
GB
GB1297012D
patent/GB1297012A/en
not_active
Expired
1970-02-02
FR
FR7003538A
patent/FR2037346A5/fr
not_active
Expired
1970-02-03
US
US8187A
patent/US3599545A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
DE1905842A1
(en)
1970-08-20
FR2037346A5
(en)
1970-12-31
US3599545A
(en)
1971-08-17
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Scene light level indicator
Legal Events
Date
Code
Title
Description
1973-04-04
PS
Patent sealed [section 19, patents act 1949]
1976-08-25
PLNP
Patent lapsed through nonpayment of renewal fees
