Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-05-25
1989-12-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, 350 68, 346108, H01J 314, G02B 2608
Patent
active
048869635
ABSTRACT:
A laser beam scanning apparatus comprises a first mirror provided for reflecting a light path between a deflector and recording medium, a beam detecting sensor for determining a start position for recording by the beam on the recording medium, and a second mirror for guiding the beam reflected by the first mirror to the sensor. The second mirror is arranged such that the beam from the first mirror is guided to the sensor after it is reflected at least one time by said first mirror. In addition, the second mirror is arranged such that on the equation .theta..sub.2 =2.theta..sub.1 is satisfied where .theta..sub.1 and .theta..sub.2 respectively denote the inclination of the first and the second mirrors to a plane orthogonal to a surface of scanning of the beam.
REFERENCES:
patent: 3970359 (1976-07-01), Starkweather
patent: 4130339 (1978-12-01), Kawamura et al.
patent: 4612555 (1986-09-01), Hongou et al.
patent: 4613877 (1986-09-01), Spencer et al.
patent: 4704698 (1987-11-01), Reiniger
patent: 4731623 (1988-03-01), Oda et al.
patent: 4823002 (1989-04-01), Saito
Allen Stephone B.
Minolta Camera Kabushiki Kaisha
Nelms David C.
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