Patent Number: 6,169,614

Title: Wedged-shape holographic collector

Abstract: A diffractive collector for an optical scanner includes a wedged-shaped substrate having holographic grating provided on a front surface, a conical-shaped back surface, and at least one detector. Substantially parallel light is made incident upon the front surface of the substrate, and the light is diffracted within the substrate to the back surface. The wedged shaped of the collector and the holographic grating cause the light to reflect back within the substrate at such an angle that the light remains within the substrate as the light propagates to the at least one detector.

Inventors: Whitcomb; Kevin J. (Shrewsbury, MA), McMaster; Brian M. (Pittsford, NY), Shearin; Alan (Portland, OR), Dean; Anna M. (Webster, NY)

Assignee: PSC Scanning, Inc.

International Classification: G02B 26/12 (20060101); G06K 7/10 (20060101); G02B 6/00 (20060101); G02B 6/42 (20060101); G02B 005/32 (); G02B 005/18 (); G02B 006/34 (); G06K 007/10 ()

Expiration Date: 01/02/2018