Film constraint and film writing system

Details Film constraint and film writing system Film constraint and film writing system

1990-03-23

1990-11-27

Hayes, Monroe H.

Optics: motion pictures

Gates

Fluid pressure type

352228, 352229, G03B 152

Patent

active

049731505

ABSTRACT:
A rigid cylinder is rotated about its axis of symmetry at a relatively high rate of speed by means of a motor. Around a portion of the circumference of the rotating cylinder is wrapped a flexible imaging medium such as photographic film, to which is applied longitudinal tension through means of a film transport. The film conforms to the curvature of the drum, but is held a small distance above the surface of the cylinder in equilibrium between the aerodynamic forces created by the rotating cylinder and the applied tension of the film transport, thus effecting a compliant surface air bearing. A scanning beam is used to write on the film in the line direction. Longitudinal movement of the film is used to affect scanning in the page direction.

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