The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 1990
Filed:
Oct. 20, 1988
Ronald J Straayer, South Windsor, CT (US);
The Gerber Scientific Instrument Company, South Windsor, CT (US);
Abstract
A novel laser raster scanner that scans, in response to control signals from a controller, an exposure beam across a substrate by means of a rotating polygonal mirror having a plurality of reflective facets provides passive facet tracking by means of a plurality of glass windows configured with the polygonal mirror to cooperate with corresponding ones of the reflective facets. A first beam steering mechanism provides the laser beam to a window at a first surface thereof. A second beam steering mechanism receives the laser beam from an opposed second window surface and provides an illumination beam to the corresponding reflective facet. Each window is positioned to displace the laser beam from the incident axis so as to produce a corresponding displacement of the illumination beam on the facet in the direction of mirror rotation.