Light beam scanning apparatus

Details Light beam scanning apparatus Light beam scanning apparatus

1987-11-16

1989-03-07

Arnold, Bruce Y.

G02B 2610

Patent

active

048100463

ABSTRACT:
In a light beam scanning apparatus using a hologram rotator, a post-hologram is provided for further diffracting a light beam diffracted by the hologram rotator to a direction opposite to that of the direction in which the light beam is diffracted by the hologram rotator. By combining the kinds of wave fronts used for forming the holograms of the holograms rotator and the post-hologram, the light beam scanning apparatus reduces the deviation of the light beam scanning position caused by the mode hopping of a laser diode, and an improved linear scanning of the light beam and/or image focusing characteristic is obtained.

REFERENCES:
patent: 4094576 (1978-06-01), Heiling
patent: 4148549 (1979-04-01), Termanis
patent: 4289371 (1981-09-01), Kramer
patent: 4428643 (1984-01-01), Kay

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