Hologan scanner system

Details Hologan scanner system Hologan scanner system

1987-11-23

1989-08-01

Arnold, Bruce Y.

G02B 2610

Patent

active

048529567

ABSTRACT:
A hologon scanning system which generates an essentially bow-free scan line or lines across a surface using a planar, and preferably a holographic, grating disposed in a holding assembly which is rotated about an axis. The surface of the grating is at a constant angle of incidence with respect to a collimated beam of laser light propagating along the axis of rotation. The grating period for the wavelength of the laser beam and for the coordinate system associated with the rotating grating provides a diffraction angle from the grating which is constant with rotation angle; the diffracted beam being perpendicular to the rotation axis. An essentially bow-free, straight scan line is obtained across the receptor surface which may be a flat image plane or a cylindrical image plane having its axis along the axis of rotation of the grating. The beam scan angle across the receptor surface is equal to the angle of rotation of the grating, rather than being related to the angle of rotation by a factor approximately equal to the ratio of wavelength of the laser light to the grating period.

REFERENCES:
patent: 4239326 (1980-12-01), Kramer
patent: 4289371 (1981-09-01), Kramer
patent: 4325601 (1982-04-01), Funato
patent: 4475787 (1984-10-01), Starkweather
Kramer, C. J., Laser Focus, Jun. 1981, p. 70.
Kramer, C. J., Proc. SPIE, 390, 165 (1983) .

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