05430285 is referenced by 139 patents and cites 11 patents.

There is disclosed an apparatus for illuminating a sensing region having an object therein, comprising a reflector that is elongated in a first plane, the reflector having a width dimension that is less than a width dimension of a sensing region to be illuminated, and further having a first curved profile in the first plane about a center of curvature. In a preferred embodiment the reflector is disposed between the center of curvature and the sensing region. In a second plane which is orthogonal to the first plane and includes the center of curvature, a reflecting surface of the reflector has a second curved profile. A plurality of substantially Lambertian light sources each face the reflector for directing light thereto generally in a direction of the center of curvature for reflection toward the sensing region. The second profile preferably comprises a portion of an ellipse and a light source is disposed substantially at a primary focus thereof. The second profile preferably has a gap for transmitting retroreflected light generated within the sensing region therethrough. An upper portion of the second profile comprises a portion of a first surface of revolution selected from the group of ellipse and parabola, and the lower portion of the second profile can comprise a portion of a second surface of revolution selected from the group of ellipse and parabola, a light source being disposed at a focus of each of the first surface of revolution and the second surface of revolution. The assembly is combined in a scanner for reading optical patterns.

Title
Illumination system for optical reader
Application Number
8/109735
Publication Number
5430285
Application Date
August 20, 1993
Publication Date
July 4, 1995
Inventor
Theresa M West
Skaneateles
NY, US
Jeffrey B Powers
Skaneateles
NY, US
William H Lagerway
Auburn
NY, US
Mark A McClaude
Syracuse
NY, US
Gerard F Beckhusen
Liverpool
NY, US
Kenneth A Wright
Syracuse
NY, US
Thomas W Karpen
Skaneateles
NY, US
Agent
Harris Beach & Wilcox
Assignee
Welch Allyn
NY, US
IPC
G06K 7/10
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