GB1391292A - Photographic exposure control systems - Google Patents

Photographic exposure control systems

Info

Publication number
GB1391292A
GB1391292A GB3518372A GB3518372A GB1391292A GB 1391292 A GB1391292 A GB 1391292A GB 3518372 A GB3518372 A GB 3518372A GB 3518372 A GB3518372 A GB 3518372A GB 1391292 A GB1391292 A GB 1391292A
Authority
GB
United Kingdom
Prior art keywords
interceptor
adjustment
exposure
electromagnet
pin
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
GB3518372A
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.)
Polaroid Corp
Original Assignee
Polaroid Corp
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 Polaroid Corp filed Critical Polaroid Corp
Publication of GB1391292A publication Critical patent/GB1391292A/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
    • 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
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera
    • G03B7/17—Selection of modes in flash units by exposure control arrangements
    • 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/70—Exposure-making shutters; Diaphragms with flash-synchronising contacts

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Shutters For Cameras (AREA)
  • Cameras Adapted For Combination With Other Photographic Or Optical Apparatuses (AREA)
  • Focusing (AREA)
  • Diaphragms For Cameras (AREA)

Abstract

1391292 Photographic camera exposure control POLAROID CORP 27 July 1972 [3 Aug 1971] 35183/72 Addition to 1371995 Heading G2A A photographic camera has a follow-focus arrangement as described in Specification No. 1371995, the coupling between the focus adjustment and the exposure aperture regulator means including a cam 158, Fig.2, movable in correspondence with the movement of the focusing means and a cam follower 156 which variably positions on interceptor leg portion 142 in the locus of travel of the exposure regulator means 34 as it moves under the action of a spring 52 to gradually close the exposure aperture formed by apertures 24, 26 in blades 16, 18. The cam is disposed on a focusing adjustment gear 124 rotation of which rotates a focusing bezel. The cam follower is mounted on an assembly 148 having elongate slot 160 which fits over a bushing 130 supporting gear 124 and an elongate slot 162 in which a pin 164 on lever 166 slides. The assembly has apertured tabs 152, 154 to which is pivotally mounted the interceptor 140. The interceptor is normally biased out of the locus of travel of striker pin 138 mounted on exposure regulator means 34 by a plunger assembly 168 engaging interceptor extension 178, but upon energization of an electromagnet 180 a plunger 182 is attracted into the electromagnet so that an arm portion 194 of a pull-down bar 186 abuts extension 174 to pivot interceptor 140 so that interceptor leg portion 142 now lies in the locus of travel. Lever 166 is coupled for movement with the adjustment of a variable density optical wedge which is adjusted in front of a photo-cell to allow for minor variations in film speed. This adjustment permits automatic exposure control in ambient light conditions, and the same adjustment is thus allowed for under flash-light conditions. The focus adjustment wheel has associated therewith a spring loaded detent pin 200 so as to prevent rotation of the wheel outside of the focus range. An electromagnet 62 when energized closes the exposure aperture by the coupling between a comb-shaped connector 70 attached to electromagnet plunger 66 and a pin 46 which couples blade 18 to the aperture regular means.
GB3518372A 1971-08-03 1972-07-27 Photographic exposure control systems Expired GB1391292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16867171A 1971-08-03 1971-08-03

Publications (1)

Publication Number Publication Date
GB1391292A true GB1391292A (en) 1975-04-23

Family

ID=22612453

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3518372A Expired GB1391292A (en) 1971-08-03 1972-07-27 Photographic exposure control systems

Country Status (6)

Country Link
JP (2) JPS4825521A (en)
CA (1) CA997190A (en)
DE (1) DE2237838C2 (en)
FR (1) FR2149857A6 (en)
GB (1) GB1391292A (en)
IT (1) IT1046467B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261295A (en) * 1989-03-31 1993-05-12 Asahi Optical Co Ltd Lens barrier

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1450633A (en) * 1973-07-05 1976-09-22 Polaroid Corp Exposure control system
US3950766A (en) * 1974-11-22 1976-04-13 Polaroid Corporation Exposure control system employing blade sensing follow focus arrangement
US3972057A (en) * 1975-03-03 1976-07-27 Polaroid Corporation Exposure control system with follow focus capability
US3977014A (en) * 1975-03-03 1976-08-24 Polaroid Corporation Follow focus exposure control system with improved uniform trim control
JPS5617526Y2 (en) * 1977-02-14 1981-04-23
JP2550785B2 (en) * 1991-02-08 1996-11-06 株式会社ダイフク Rail laying structure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5618933A (en) * 1979-07-23 1981-02-23 Kuraray Co Ltd Dihydroxy aluminum salt of substituted acetic acid and its preparation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261295A (en) * 1989-03-31 1993-05-12 Asahi Optical Co Ltd Lens barrier
GB2261295B (en) * 1989-03-31 1993-09-15 Asahi Optical Co Ltd Lens barrier shield
US5434714A (en) * 1989-03-31 1995-07-18 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel
US5450242A (en) * 1989-03-31 1995-09-12 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel
US5636063A (en) * 1989-03-31 1997-06-03 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel
US5646790A (en) * 1989-03-31 1997-07-08 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens barrel

Also Published As

Publication number Publication date
IT1046467B (en) 1980-06-30
CA997190A (en) 1976-09-21
JPS5882229A (en) 1983-05-17
DE2237838A1 (en) 1973-02-15
JPS6113568B2 (en) 1986-04-14
JPS4825521A (en) 1973-04-03
FR2149857A6 (en) 1973-03-30
DE2237838C2 (en) 1982-09-23
AU4517572A (en) 1974-02-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]