Light beam scanning apparatus

Details Light beam scanning apparatus Light beam scanning apparatus

1983-12-09

1986-12-30

Punter, William H.

G02B 2608

Patent

active

046324992

ABSTRACT:
A light beam scanning apparatus comprises a rotatable plate provided with at least one plane diffraction grating, and a light beam source for emitting a light beam incident on the plane diffraction grating so that the plane of incidence is a plane in which the rotation axis of the rotatable plate lies. The light beam diffracted by the plane diffraction grating is reflected at least by use of a plane reflection surface normal to the plane of incidence, and guided again to the plane diffraction grating. The light beam diffracted again by the plane diffraction grating is focused by a focusing lens onto a scanning surface, whereby a bow-free scan line is formed on the scanning surface as the rotatable plate is rotated.

REFERENCES:
patent: 4304459 (1981-12-01), Kramer
patent: 4428643 (1984-01-01), Kay
Wyant, "Rotating Diffraction Grating Laser Beam Scanner", Applied Optics, vol. 14, No. 5, May 1975, 1057-1058.

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