Overhead projector

Details Overhead projector Overhead projector

1993-03-19

1994-05-31

Cuchlinski, Jr., William A.

Optics: image projectors

Epidiascope

353DIG4, 353122, G03B 2108

Patent

active

053173503

ABSTRACT:
An overhead projector has a stage on which original material is placed. The stage has a Fresnel mirror. An electrostatic attracting structure is integral with the Fresnel mirror. The attracting structure includes a conductive membrane of ceramic and a resinous dielectric/protective layer. The conductive membrane consists of a pair of comb-shaped electrodes, which interfinger in coplanar fashion, and are covered by the dielectric/protective layer for insulation and protection. A power supply device applies a high voltage of direct current to the electrodes. The original material is attracted electrostatically by the electrodes, and can be kept flat on the stage. In a preferred embodiment, the power supply device incorporates a self-starting blocking oscillator, which is adapted to boost the voltage sufficiently for electrostatic attraction.

REFERENCES:
patent: 3762809 (1973-10-01), Kato et al.
patent: 3844650 (1974-10-01), Nicholson et al.
patent: 4732468 (1988-03-01), Wright
patent: 4921343 (1990-05-01), Ushiro et al.

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