Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
January 29, 2019
Patent Application Number
15487397
Date Filed
April 13, 2017
Patent Citations Received
Patent Primary Examiner
Patent abstract
When reading a coupon that displays a pattern when a target substance is detected, recognition of the target pattern can be hindered by nonuniform illumination of the coupon. In one aspect, methods and devices are disclosed for uniform illumination of a coupon using a negative axicon lens and a light diffusing assembly. In another separate aspect, methods are disclosed for mathematically compensating for nonuniform illumination of a coupon.
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