Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2005-05-24
2005-05-24
Lee, Michael G. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C235S462220, C235S462240, C235S462360, C235S462420
Reexamination Certificate
active
06896184
ABSTRACT:
A planar laser illumination and imaging (PLIIM) based system having a linear image formation and detection module disposed in a system housing, and having image formation optics with a field of view projectable through an aperture in the housing and onto an object moving relative thereto during object illumination and imaging operations. A pair of planar laser illumination arrays (PLIAs) are disposed on the system housing. Each planar laser array (PLIA) includes a plurality of laser diodes arranged together in a linear manner. The planar laser illumination arrays are arranged in relation to the linear image formation and detection module, and produce a pair of planar laser illumination beams (PLIBs). The pair of stationary planar laser illumination beams are projected through light transmission apertures in the system housing and oriented such that the plane of the planar laser illumination beams is coplanar with the field of view of the linear image formation and detection module. Each planar laser illumination beam is focused so that the minimum beam width thereof occurs at a point which is the maximum object distance at which the PLIIM based system is designed to acquire linear images of the object. The object can be simultaneously illuminated by the planar laser illumination beams and imaged within the field of view of the linear image formation and detection module. A series of linear images of the object are sequentially detected by the linear image formation and detection module as the object moves past the housing, so that the series of linear images can be grabbed and buffered for subsequent use in constructing two-dimensional images of the object. By virtue of the present invention, decreases in the power density of the planar laser illumination beam incident on the object are optically compensated for due to fact that the width of the planar laser illumination beam increases in length for increasing object distances away from the image formation optics.
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Amundsen Thomas
Dobbs Russell Joseph
Knowles Carl Harry
Naylor Charles A.
Schnee Michael D.
Kim Ahshik
Lee Michael G.
Metrologic Instruments Inc.
Perkowski Esq. P.C. Thomas J.
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