GB2016718A - Shutter Timing Circuit - Google Patents

Shutter Timing Circuit

Info

Publication number
GB2016718A
GB2016718A GB7904749A GB7904749A GB2016718A GB 2016718 A GB2016718 A GB 2016718A GB 7904749 A GB7904749 A GB 7904749A GB 7904749 A GB7904749 A GB 7904749A GB 2016718 A GB2016718 A GB 2016718A
Authority
GB
United Kingdom
Prior art keywords
output
capacitor
input
diode
shutter
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.)
Granted
Application number
GB7904749A
Other versions
GB2016718B (en
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.)
Rollei Werke Franke und Heidecke GmbH and Co KG
Original Assignee
Rollei Werke Franke und Heidecke GmbH and Co KG
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 Rollei Werke Franke und Heidecke GmbH and Co KG filed Critical Rollei Werke Franke und Heidecke GmbH and Co KG
Publication of GB2016718A publication Critical patent/GB2016718A/en
Application granted granted Critical
Publication of GB2016718B publication Critical patent/GB2016718B/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
    • G03B7/083—Analogue circuits for control of exposure time

Abstract

The circuit comprises an operational amplifier 9, a capacitor 8 connected to the + input, a log diode 12 connected between the output 17 and the + input, and a switch 10 connected between the output 17 and the - input. Before exposure, capacitor 8 stores a logarithmically compressed shutter timing signal computed from brightness, film speed and aperture inputs. Upon shutter release, switch 10 opens and capacitor 8 integrates the amplifier output logarithmically expanded by the diode 12. Eventually the output 17 turns off a transistor 18 to de-energize a shutter closing electromagnet 19. The combination 8, 9 thus has the dual function of storage and integration. A second diode 23 provides temperature compensation. <IMAGE>
GB7904749A 1978-03-14 1979-02-09 Shutter timing circuit Expired GB2016718B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782810907 DE2810907A1 (en) 1978-03-14 1978-03-14 PHOTOGRAPHIC CAMERA WITH AUTO EXPOSURE

Publications (2)

Publication Number Publication Date
GB2016718A true GB2016718A (en) 1979-09-26
GB2016718B GB2016718B (en) 1982-07-07

Family

ID=6034338

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7904749A Expired GB2016718B (en) 1978-03-14 1979-02-09 Shutter timing circuit

Country Status (3)

Country Link
JP (1) JPS54127323A (en)
DE (1) DE2810907A1 (en)
GB (1) GB2016718B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495790A1 (en) * 1980-12-05 1982-06-11 Olympus Optical Co AUTOMATIC EXPOSURE CONTROL DEVICE FOR DIRECT PHOTOMETRY TYPE PHOTOGRAPHIC APPARATUS THROUGH THE OBJECTIVE
US4367022A (en) * 1981-03-24 1983-01-04 Olympus Optical Company Ltd. Exposure control circuit for camera of TTL reflective photometry type

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495790A1 (en) * 1980-12-05 1982-06-11 Olympus Optical Co AUTOMATIC EXPOSURE CONTROL DEVICE FOR DIRECT PHOTOMETRY TYPE PHOTOGRAPHIC APPARATUS THROUGH THE OBJECTIVE
US4367022A (en) * 1981-03-24 1983-01-04 Olympus Optical Company Ltd. Exposure control circuit for camera of TTL reflective photometry type

Also Published As

Publication number Publication date
GB2016718B (en) 1982-07-07
DE2810907A1 (en) 1979-09-27
JPS54127323A (en) 1979-10-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee