GB1251311A - - Google Patents

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Publication number
GB1251311A
GB1251311A GB1251311DA GB1251311A GB 1251311 A GB1251311 A GB 1251311A GB 1251311D A GB1251311D A GB 1251311DA GB 1251311 A GB1251311 A GB 1251311A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
pin
lever
support
ram
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
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 filed Critical
Publication of GB1251311A publication Critical patent/GB1251311A/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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • G03B9/07—Diaphragms with means for presetting the diaphragm

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Structure And Mechanism Of Cameras (AREA)

Abstract

1,251,311. Camera pre-selection diaphragms. PENTACON DRESDEN KAMERA-UND KINOWERKE. VEB. Jan.29, 1970, No.4329/70. Heading G2A. A camera pre-selection diaphragm operating mechanism is designed so that whatever diaphragm aperture is pre-selected an operating ram 12 makes working stroke of constant length and that the pre-set diaphragm aperture is attained at the same point in its stroke. A diaphragm ring 11 carries a pin 20 which engages in a forked end of a diaphragm lever 1, which lever has a bushing 17, rotatably mounted on a fixed pin 2, and a transmission pin 3, fixed to the bushing. A movable support 6 has a lug 6a which carries a bearing pin 8, an operating lever 7 being rotatably mounted on pin 8 and having an operating surface 23 engaged by ram 12 and a transmission arm 21 for engaging pin 3. A rotatable stop lever 9 has a stop 14 for engaging a control lug 24 on support 6 and an adjusting pin 16. A stop pin 18 is provided on diaphragm lever 1. A diaphragm pre-selector ring 4 carries a diaphragm cam 13 and on adjusting cam 15 for respectively engaging pins 18 and 16. In operation, the pre-selection of a diaphragm value by ring 4 positions lever 9 and thus support 6 so that a distance 'a', Fig. 4, exists between transmission arm 21 and pin 3. Operation of ram 12 causes operating lever 7 to have an idle stroke before the diaphragms leaves commence stopping down, and the pre-selected diaphragm is attained when pin 18 is engaged by cam 13; further movement of ram 12 causes lever 7 to rotate about its point of engagement with pin 3, which movement causes support 6 to move against the bias of a spring 10. Diaphragm lever 1 pivots through an angle 'h' to move the blades from maximum to minimum aperture; the length of the idle stroke 'a' is designed to correspond to that part of the angle 'h', viz 't', that is prevented when the intermediate pre-selected aperture has been attained. The support 6 is rotatably mounted coaxial with the optical axis as shown, or it may in the form of a lever rotatably mounted about an axis parallel to the optical axis, Fig. 5 (not shown).
GB1251311D 1970-01-29 1970-01-29 Expired GB1251311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB432970 1970-01-29

Publications (1)

Publication Number Publication Date
GB1251311A true GB1251311A (en) 1971-10-27

Family

ID=9775117

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1251311D Expired GB1251311A (en) 1970-01-29 1970-01-29

Country Status (1)

Country Link
GB (1) GB1251311A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees