Laser scanner with beam transmissivity control

Details Laser scanner with beam transmissivity control Laser scanner with beam transmissivity control

1988-08-26

1990-09-25

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346160, 358481, G01D 1514, A04N 140

Patent

active

049596640

ABSTRACT:
A light amount correcting interference membrane having almost constant thickness and characteristic for increasing transmissivity corresponding to an increase of incidence angle of a laser beam is provided on a scanning light path extending from a rotary optical deflector to a recording medium in a scanning optical system. The laser beam deflected by the rotary optical deflector for scanning the recording medium is transmitted through the light amount correcting interference membrane wherein the scanning velocity of the laser beam reaching the peripheral portion of the recording medium is faster than that of the laser beam reaching the central portion, and an incidence angle becomes large and transmissivity becomes high.

REFERENCES:
patent: 4251821 (1981-02-01), Kimura
patent: 4410237 (1983-10-01), Veldkamp
patent: 4651170 (1987-03-01), Chandler

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