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:
Sep. 28, 1993
Filed:
Oct. 28, 1991
Drew D Summers, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
In a laser imaging apparatus including a multifaceted polygon scanner, a technique for correcting facet reflectance differences to effect uniform laser light power output for all scanner facets. A set of facet reflectance look-up tables are determined as follows. Determine the relative reflectance for each facet of the polygon scanner. Calculate gain factors referenced to the minimum relative reflectance. Determine the relationship between laser power and DAC code value for the minimum reflectance facet for a number of measured values. Calculate this relationship for all 2.sup.n DAC code values to produce a look-up table for the minimum reflectance facet. Shift the laser powers by the relative reflectance for each other facet of the polygon scanner and back calculate the DAC code values that would yield the same laser powers as the minimum reflectance facet to produce look-up tables for the other facets.