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. 12, 1996
Filed:
Mar. 22, 1994
Yasuji Ogawa, Saitama, JP;
Wacom Co., Ltd., Saitama, JP;
Abstract
An optical position detecting unit comprising: a light-receiving device including a pixel array to form a light-receiving region and for outputting signals with respect to light detected by respective pixels in the pixel array; a pattern member disposed in the front of the light-receiving region of the light-receiving device and having a pattern having a characteristic that an image of the pattern projected onto the light-receiving region by an incident light beam determines the direction of incidence of the light beam univocally; and a signal processing device for extracting information with respect to the direction of incidence of the light beam on the basis of the signals outputted from the respective pixels in the pixel array. The pattern preferably has M-sequence characteristic. Further, an optical coordinate input unit is realized by using: a coordinate detector formed by using at least two optical position detecting units of the type as described above; and a position pointer including a light-emitting portion.