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:
Mar. 26, 2002
Filed:
May. 11, 2000
Saeilo Japan, Inc., , JP;
Abstract
An object detecting optical unit for detecting a direction or a position of an object placed on a detecting plane surface is disclosed. The optical unit detects existence or non existence of a retroreflective light reflected by a retroreflective member. A light projection device is formed by a plurality of light sources and corresponding lenses, arranged in to form a fan shaped projection pattern parallel to the detecting plane surface, the projection pattern being as if projected from a virtual one point light source. A light receiving device is included which has a slit or lens and linear photoreceptive group, arranged in such a manner as to form a light receiving pattern with a view field corresponding to the fan shaped projection pattern. A position coordinate input apparatus using the optical unit is also disclosed.