Combination focussing screen and film holder attachment
AssigneePolaroid Corporation
InventorJan VAN DER Meer
Life of this patent
Estimating the term…
Abstract
An attachment for a photographic camera for alternately maintaining a focussing screen and a film holder in an operative position with respect to a camera. The attachment is provided with a focussing screen rendered movable by connection to a rotatable shaft between operative and operative positions to permit placement of the film holder when the screen is in its inoperative position. Locking means actuated by the rotatable shaft are provided to lock the focussing screen or the film holder in operative positions. Also, means operated by rotation of the shaft are provided to control the condition of the camera shutter.
Claims11
Apparatus for use with a photographic camera for alternately maintaining a focussing screen and a film holder in an operative position on a camera, comprising:
- (a) frame means comprising a plurality of sides defining a rectangular aperture;
- (b) means for mounting the frame on the camera;
- (c) shaft means mounted for rotation in opposite directions adjacent one side of the frame;
- (d) a focussing screen;
- (e) locking means;
- (f) means responsive to rotation of the shaft in one direction for moving the focussing screen into a position covering the aperture and responsive to rotation of the shaft in the opposite direction for moving the screen away from the aperture;
- and
- (g) means responsive to rotation of the shaft in the one direction for causing the locking means to lock the focussing screen in its position covering the aperture and responsive to the opposite rotation of the shaft for releasing the locking means from the focussing screen;
- whereby the film holder may be brought into engagement with the frame means when the focussing screen is in its position remote from the aperture.
Apparatus for use with a camera, said apparatus comprising:
- means, including a first frame, for defining a rectangular aperture and arranged to seatingly receive a film holder in operative relationship with said aperture to facilitate the exposure of the film unit retained in the film holder through said aperture;
- means for mounting said aperture defining means on the camera;
- a shaft extending adjacent one side of said first frame and being mounted for rotation about its axis from a first position through a second position to a third position;
- a locking member;
- a focussing screen assembly including a second frame, and said second frame including a recess formed in one peripheral edge thereof;
- and
- means for connecting said focussing screen assembly and said locking member to said shaft so that:
- (a) when said shaft is disposed in its said first position, said focussing screen assembly is seated on said first frame with its said focussing screen overlying said aperture and said locking member is engaged in said recess of said second frame of said focussing screen assembly,
- (b) when said shaft has been rotated from its said first position into its said second position said focussing screen assembly remains seated on said first frame and said locking member is disengaged from said recess of said second frame of said focussing screen assembly, and
- (c) when said shaft is rotated from its said second position into its said third position, said focussing screen assembly is withdrawn away from said first screen to facilitate the seating of the film holder on said first frame.
Dependencies are inferred from the claim text.