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:
Jan. 07, 2003
Filed:
May. 25, 2000
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A coordinates detection apparatus comprises two optical units each having a light emitter, a diffusion lens, a read lens, and a light-receiver. The optical units are provided at different positions on the border of a display surface. The light-emitter and light-receiver in each optical unit are so located that their optic axes are coincident. A recursive reflection section reflects the light emitted from the light-emitter and diffused by the diffusion lens in a fan form towards the light-emitter. The coordinates of a point specified on the display surface are detected by focusing the light reflected on the reflection section with the read lens, receiving the reflected light with the light-receiver, and determining the position where reception of the light is hindered.