Hologon laser scanner apparatus

Details Hologon laser scanner apparatus Hologon laser scanner apparatus

1984-08-16

1986-09-09

Corbin, John K.

350 67, G02B 2610

Patent

active

046105000

ABSTRACT:
A unitary assembly of a hologon scanner disc or spinner, a motor for rotating the disc and a lens for focusing the deflected laser beam on an image surface. A housing including a base plate and a cover removably mounted on the base plate, encloses the hologon disc. The base plate has a surface with respect to which the position of the hologon disc and lens is referenced. The cover has a platform on which lenses are interchangably mounted, such that, each lens has the correct position and orientation with respect to the entrance pupil of the scanner system. The hologon disc is also removably mounted on the shaft of the motor and referenced against a shoulder of the shaft which is precisely spaced with respect to the reference surface of the base plate of the housing. The hologon deflector facets of different discs which are mounted on the shaft always have the same alignment with respect to the lens and the laser beam which is incident thereon. The unitary assembly may be installed in a laser printer, or other device requiring a scanner, aligned with the beam of the laser which enters an opening in the housing below the hologon disc. The beam is deflected and scanned by the disc grating facets and focused by the lens on the imaging surface, such as the drum or belt on which a latent electrostatic image is formed by the scanned laser beam.

REFERENCES:
patent: 4289371 (1981-09-01), Kramer
patent: 4415224 (1983-11-01), Dickson
patent: 4428643 (1984-01-01), Kay
patent: 4505537 (1985-03-01), Funato

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