Laser beam scanning apparatus for scanning a laser beam obtained

Details Laser beam scanning apparatus for scanning a laser beam obtained Laser beam scanning apparatus for scanning a laser beam obtained

1991-07-30

1993-08-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, 359214, H01J 314

Patent

active

052331881

ABSTRACT:
In a laser beam scanning apparatus, first and second laser beam emitters emit a laser beam polarized in a specific direction and a laser beam polarized in the direction orthogonal with this specific direction. A prism passes a laser beam emitted from the first laser beam emitter but reflects a laser beam emitted from the second laser beam emitter, and amalgamates two laser beams emitted from the first and second laser beam emitters in almost the same direction. A rotating polygonal mirror and a scanning lens simultaneously scan on a scanned plane two laser beams amalgamated by the prism. A 1/4 wavelength plate is inserted between the rotating polygonal mirror and the prism to change the laser beam from the prism from a linearly polarized state to a circularly polarized state. By the above arrangement, a difference of reflection factors between two laser beams incident to the rotating polygonal mirror can be eliminated so that two uniform laser beams can be scanned at the same time.

REFERENCES:
patent: 4525024 (1985-06-01), Tatsuno et al.
patent: 4760407 (1988-07-01), Arimoto et al.
patent: 4796961 (1989-01-01), Yamada et al.
patent: 5066962 (1991-11-01), Sarraf
patent: 5097351 (1992-03-01), Kramer
"Principle of Optics", 4th Edition, 1976, McGraw-Hill, p. 535.

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