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, 1996
Filed:
Jul. 28, 1994
Yasuji Ogawa, Saitama, JP;
Hideo Yoichi, Saitama, JP;
Wacom Co., Ltd., Saitama, JP;
Abstract
An optical position detecting unit is configured by an image pickup unit for detecting the intensity of light, a pattern member disposed in the front of the image pickup unit and on a light path of the light and having a specific pattern, and a signal processing unit for extracting information with respect to the distance in the direction of a normal line of a pixel array region of the image pickup unit between a light-emitting source and the image pickup unit on the basis of signals with respect to the specific pattern projected to the pixel array. A distance between the pattern member and the pixel array of the image pickup unit is required to be known in advance in order to extract the information with respect to the distance. By using only one image pickup unit, the distance to the light-emitting source can be calculated.