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:
Jul. 23, 1996
Filed:
Feb. 24, 1994
Paul F Sullivan, Westwood, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
In an electronic image printing apparatus of the type in which a light sensitive image recording layer is exposed by a light beam, an apparatus is provided for determining and controlling the position of the light beam which comprises one or two alternating pluralities of diffraction grating patterns disposed in a corresponding relationship with at least a portion of the light sensitive image recording layer to produce a diffraction grid which when irradiated by the light beam provides a diffracted beam which is representative of the position of the light beam on the diffraction grid. The position of the diffracted beam is detected to provide the requisite signal for controlling the position of the light beam.