Photographic printer

Details Photographic printer Photographic printer

1994-05-02

1995-06-13

Gellner, M. L.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

355 38, 355 68, 355 71, G03B 2754

Patent

active

054248027

ABSTRACT:
A photographic printer has a first polarizing beam splitter for splitting light from a light source into a first polarized light and a second polarized light. The first polarized light passes through a first liquid crystal cell having a liquid crystal material held between grid-like transparent electrodes. At this time, the plane of polarization of the first polarized light is changed in each small region formed in the liquid crystal cell. The first polarized light then enters a second polarizing beam splitter. On the other hand, the second polarized light enters the second polarizing beam splitter after its plane of polarization has been changed. At the second polarizing beam splitter, the first polarized light and the second polarized light are combined and then projected on a print paper via a photographic film so that an image recorded on the photographic film is exposed and printed on the print paper. Accordingly, the time required for exposure can be shortened compared to conventional photographic printers using polarizing plates.

REFERENCES:
patent: 5122831 (1992-06-01), Suzuki
patent: 5155524 (1992-10-01), Oberhardt et al.

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