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:
Nov. 05, 1996
Filed:
Dec. 15, 1994
Yasuyuki Sakai, Kariya, JP;
Katsunori Goto, Handa, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An optical information reading apparatus has an optical system which includes a concave mirror. The concave mirror has first and second concave portions and a planar portion. Reflection optical axes of the first and second concave portions are set offset relative to a reflection optical axis of the planar portion. This makes it possible to arrange a light source and a light-receiving sensor with a given proper interval therebetween in a longitudinal direction of the apparatus so that a thickness of the apparatus can be reduced. The first concave portion may form a portion of a first ellipsoidal surface of revolution and the second concave portion may form a portion of a second ellipsoidal surface of revolution. The first and second ellipsoidal surfaces share a rotation axis and focal points located at conjugate points on the rotation axis. The first concave portion is located closer to a rotating mirror than the second concave portion, and diameters of the second ellipsoidal surface are set greater than those of the first ellipsoidal surface. This also contributes to reducing the thickness of the apparatus.