Photocopying – Projection printing and copying cameras – Distortion introducing or rectifying
Patent
1979-03-26
1980-12-09
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Distortion introducing or rectifying
355 84, G03B 2710, G03B 2768
Patent
active
042381568
ABSTRACT:
A photographic reproportioning apparatus for changing one dimension of a two-dimension image projected on a photosensitive member having a main travel board supporting a sub-travel board for movement in a linear path. The boards are shielded from a light source with an opaque mask having an exposure window to expose the photosensitive member as it moves relative to the window. Motion transmitting structure operates to move the sub-travel board at the same speed or less than the speed of the main travel board. The motion transmission structure has an adjustable speed control bar connected to a first drive mounted on the main travel board. The first drive operates a second drive mounted on the main travel board and connected to the sub-travel board. The speed of movement of the first drive depends on the angular position of the speed control bar relative to the longitudinal path of movement of the main travel board and the speed of the main travel board. The first drive also rotates a wheel. The wheel is used with the main travel board to change the linear image to an arcuate image. The mask has a second tapered exposure window that diverges away from the axis of rotation of the wheel to provide an even light exposure along the length of the exposure line. The mask with the tapered exposure window is used when the wheel and main travel board are used to make an arcuate image.
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