发明名称 BAR CODE SCANNING AND READING APPARATUS AND DIFFRACTIVE LIGHT COLLECTION DEVICE SUITABLE FOR USE THEREIN
摘要 A miniature scanning apparatus light collection system with a detector (28) in which a collector is a body of material transmissive at the laser wavelength. The body presents a surface which is orientable so that the return light is incident at or close to perpendicular to the surface. In the body and parallel to the surface is a volume grating (62) having Bragg planes (70) arranged in rings (82 and 84) around center regions (32 and 34) in alignment with the detectors. The angles of the Bragg planes vary progressively and decrease in a direction towards the center region so that light which is incident on the collector at angles of incidence which vary from perpendicular to the surface by about +/-5 degrees are diffracted and propagate by guided mode propagation including reflections at the internal surfaces of the body and transmission through the grating to the detector.
申请公布号 WO9611450(A1) 申请公布日期 1996.04.18
申请号 WO1995US12262 申请日期 1995.10.02
申请人 PSC INC. 发明人 EASTMAN, JAY, M.;QUINN, ANNA, M.;WHITCOMB, KEVIN, J.;ZAVISLAN, JAMES, M.
分类号 G02B26/10;G02B27/44;G06K7/10;(IPC1-7):G06K7/10 主分类号 G02B26/10
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