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:
Oct. 06, 1992
Filed:
Aug. 06, 1990
Nippondenso Co., Ltd., Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
A bar code reader includes a hologram receiving a scanning light beam in sequence from a scanning light beam source for directing the scanning light beam to a bar code to be read along one path so that the bar code is scanned with the scanning laser beam in two-dimensional directions, and for guiding the scanning light beam to a photo-detector along the same path after the scanning light beam is reflected from the bar code, a condenser lens disposed in an optical system between the photo-detector and the hologram for collecting the reflected scanning light beam into the photo-detector, and a light blocking member disposed in an optical system between the condenser lens and the hologram for blocking unwanted light from the photo-detector, which unwanted light advances toward an incident side of the hologram on which the scanning light beam is directed.