Variable attenuator for dual beams

Details Variable attenuator for dual beams Variable attenuator for dual beams

1991-12-23

1994-05-10

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

H04M 121

Patent

active

053112172

ABSTRACT:
A variable attenuator for electronically controlling dual beam intensity comprising a laser source for emitting a light beam, a twisted nematic liquid crystal for exposure control of the light beam, a double-sided multi-layer dielectric thin film coated polarization plate for decreasing the s-component of the light beam to less than or equal to 0.0001 of the light beam emitted from the laser source, and a beam splitting crystal for separating said light beam into two beams of equal intensity.

REFERENCES:
patent: 4461542 (1984-07-01), Gagnon
patent: 4500172 (1985-02-01), Gagnon et al.
patent: 4715684 (1987-12-01), Gagnon
patent: 5200843 (1993-04-01), Karasawa et al.
patent: 5216541 (1993-06-01), Takesue et al.

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