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US 4,284,994 AGranted
Laser beam recorder
AssigneeEikonix Corporation
InventorBruce M. Radl
Life of this patent
Estimating the term…
Abstract
A compact and simple laser beam recorder is arranged to minimize line scan displacement error typical of such recorders using a rotating polygonal mirror scanner.
Claims10
Recording apparatus comprising:
- photosensitive material;
- a laser for providing a beam of coherent light;
- modulator means being connected to said laser for modulating said laser beam in response to an electrical signal representative of an image;
- filter means for spatially filtering said modulated laser beam, said filter means having a pinhole for providing an axial object point;
- a rotatable polygonal mirror;
- a cylindrical lens for imaging said object point as a line on said polygonal mirror;
- a scan lens;
- and
- beam splitting means for directing said filtered and modulated laser beam along an optical path through said cylindrical lens and scan lens for reflection by said mirror, said reflected beam being redirected in reverse along said optical path through said scan lens, cylindrical lens and beam splitting means to the photosensitive material for recording as an image point.
6 more elements
Recording apparatus comprising:
- photosensitive material;
- a laser for providing a beam of coherent light;
- modulator means being connected to said laser for modulating said laser beam in response to an electrical signal representative of an image;
- filter means for spatially filtering said modulated laser beam, said filter means having a pinhole for providing an axial object point;
- a rotatable polygonal mirror;
- a scan lens;
- first and second stationary plane mirrors with reflecting surfaces angularly arranged relative to an optical axis as one dimensional retro-reflectors;
- and
- beam reflecting means for directing said filtered beam along said axis through said scan lens to be incident on said polygonal mirror at an angle other than 90.degree., whereby said incident beam is reflected twice by said polygonal mirror and once by each of said stationary mirrors, said reflected beam being redirected in reverse along said optical axis through said scan lens to said photosensitive material for recording as an image point.
6 more elements
Dependencies are inferred from the claim text.