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Memory switch controls for cameras

  • US 3,887,932 A
  • Filed: 09/19/1973
  • Issued: 06/03/1975
  • Est. Priority Date: 09/21/1972
  • Status: Expired due to Term
First Claim
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1. In a single lens reflex camera which measures light internally and which has a swingable mirror normally occupying a lower viewing position where said mirror reflects light which has travelled through the objective to a light-measuring structure and being swingable from said lower position to an upper exposure position where light travelling through the objective no longer reaches the light-measuring structure, memory switch means movable between a normal inactive position and an operative position enabling a memory structure to retain information received by the light-measuring structure, said memory switch means having an inherent force which acts to maintain said memory switch means in said inactive position, mirror-drive means cooperating with the mirror to drive the latter upwardly from said lower viewing position to said upper exposure position, switch-operating means cooperating with said memory switch means for displacing the latter in opposition to said inherent force from said normal inactive position to said operative position, said switch-operating means having a rest position cooperating with said mirror-drive means to prevent operation thereof, said switch-operating means being movable from said rest position thereof for placing said memory switch means in said operative position thereof, while said switch-operating means also releases said mirror-drive means for operation to drive said mirror to said exposure position thereof, and manually operable release means to be set into motion by the operator of the camera for carrying out operations in connection with shutter release, said manually operable release means cooperating with said switch-operating means for moving the latter to place said memory switch means in said operative position thereof, whereby said mirror-drive means will not be released to drive the mirror upwardly to its exposure position until after said memory switch means has been placed by said switchoperating means in said operative position thereof.

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