The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 1990
Filed:
Nov. 07, 1988
James L Griffin, Carpentersville, IL (US);
Wells-Gardner Electronics Corp., Chicago, IL (US);
Abstract
An improved radiant energy distribution and detection apparatus for use with a device for detecting radiant energy reflected from a target zone includes an emission device for generation and emission of radiant energy, a device for redirecting radiant energy along a predetermined path and a detector device for sensing the presence of radiant energy reflected from the target zone. The emission device is stationary and emits a beam of radiant energy toward the redirecting device, which redirects the radiant energy along a primary beam path. The redirecting device also is configured for permitting a return beam of light from the target area to impinge upon the detector device, which is located therebehind with repect to the direction of travel of the return beam. A masking arrangement is employed for substantially limiting light reaching the detector to light from the return beam. Also a focusing arrangement is employed for the emission device for focusing the emitted light upon the redirecting device relative to the masking arrangement and detector so as to cause detection of the return beam to take place substantially in the same position as the apparent source of the emitted beam.