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:
May. 04, 1999
Filed:
Feb. 26, 1997
Kiyoshi Tanaka, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
In a bar code reading optical apparatus including a semiconductor laser and a prism both mounted on a photodiode IC so that emitted light from a semiconductor laser is reflected by a reflective plane of a prism and signal light from a bar code to be read out enters in and detected by a photodiode, a numerical aperture conversion hologram is provided in a light path of the emitted light reflected by the reflective plane of the prism to adjust the numerical aperture of a converging lens so that the numerical aperture for the emitted light be smaller than the numerical aperture for the signal light. The numerical aperture conversion hologram may be omitted by shaping the reflective plane of the prism into a concave plane to adjust the numerical value for the emitted light smaller than the numerical value for the signal light.