GB993363A - Improvements in or relating to automatic aperture control systems for cameras - Google Patents

Improvements in or relating to automatic aperture control systems for cameras

Info

Publication number
GB993363A
GB993363A GB4647762A GB4647762A GB993363A GB 993363 A GB993363 A GB 993363A GB 4647762 A GB4647762 A GB 4647762A GB 4647762 A GB4647762 A GB 4647762A GB 993363 A GB993363 A GB 993363A
Authority
GB
United Kingdom
Prior art keywords
aperture
cell
photo
camera
mirror
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
GB4647762A
Inventor
John Michael Jotcham
John Henry Shelley
Stuart Christopher Ewens
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.)
S Smith and Sons Ltd
S Smith and Sons England Ltd
Original Assignee
S Smith and Sons Ltd
S Smith and Sons England Ltd
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 S Smith and Sons Ltd, S Smith and Sons England Ltd filed Critical S Smith and Sons Ltd
Priority to GB4647762A priority Critical patent/GB993363A/en
Publication of GB993363A publication Critical patent/GB993363A/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)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

993,363. Automatic control of camera aperture. S. SMITH & SONS (ENGLAND) Ltd. Dec. 6, 1963 [Dec.10, 1962], No. 46477/62. Headings G2A and G3R. In a system for automatically controlling the aperture of a camera, a proportion of the light passing through the aperture during operation of the camera continuously influences a photo-cell the electrical output of which controls mechanical means adjusting the aperture. In Fig. 1 a proportion of the light passing through the zoom lens 1 of a cine camera to a film 26 is reflected by a partially silvered mirror 3 on to a photo-conductive cell 4 so that variations in light intensity from a desired value determined by the setting of an adjustable neutral density filter 9 are effective, through a temperature-compensated transistor amplifier 5 and moving coil actuator 25, to adjust an aperture 2 in such sense as to restore the light intensity to the desired value. Moving coil 25 rotates an L-shaped lever 8 about a pivot 37 so that, as shown in Fig. 2, a pin 31, near one extremity of lever 8, moves aperture jaws 27, 28 in opposite directions about their pivots 29, 30. Photo-conductive cell 4 may alternatively be arranged to vary the amplitude of oscillation of a transistor oscillator the output of which is rectified to energize moving coil 25. To increase the aperture for slow motion effects an additional filter is interposed between mirror 3 and cell 4. A further filter may be temporarily interposed between lens 1 and mirror 3 to open the aperture without increasing light intensity prior to the introduction of the slow motion filter. Use of a photo voltaic cell or phototransistor is referred to, and the partially silvered mirror may be replaced by a prism which reflects a portion of the light.
GB4647762A 1962-12-10 1962-12-10 Improvements in or relating to automatic aperture control systems for cameras Expired GB993363A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4647762A GB993363A (en) 1962-12-10 1962-12-10 Improvements in or relating to automatic aperture control systems for cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4647762A GB993363A (en) 1962-12-10 1962-12-10 Improvements in or relating to automatic aperture control systems for cameras

Publications (1)

Publication Number Publication Date
GB993363A true GB993363A (en) 1965-05-26

Family

ID=10441426

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4647762A Expired GB993363A (en) 1962-12-10 1962-12-10 Improvements in or relating to automatic aperture control systems for cameras

Country Status (1)

Country Link
GB (1) GB993363A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007104829A1 (en) * 2006-03-15 2007-09-20 Nokia Corporation Aperture construction for a mobile camera

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007104829A1 (en) * 2006-03-15 2007-09-20 Nokia Corporation Aperture construction for a mobile camera
US7585122B2 (en) 2006-03-15 2009-09-08 Nokia Corporation Aperture construction for a mobile camera
CN101405650B (en) * 2006-03-15 2012-03-14 诺基亚公司 Aperture construction for a mobile camera

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