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:
Aug. 13, 2013
Filed:
Feb. 20, 2008
Naoyuki Machida, Tokyo, JP;
Akihiro Kitaguchi, Tokyo, JP;
Shigenori Shibue, Tokyo, JP;
Yoshinori Asamura, Tokyo, JP;
Naoyuki Machida, Tokyo, JP;
Akihiro Kitaguchi, Tokyo, JP;
Shigenori Shibue, Tokyo, JP;
Yoshinori Asamura, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An object of the present invention is to provide a position detecting device that allows simultaneous use by a plurality of users by recognizing positional information about a plurality of pointers and associating the pointers and the users. A position detecting device of the invention includes a rear projector that projects an image, a projection screen that displays the image projected from the rear projector, imaging means that is located near the rear projector and that takes an image of light rays emitted from pointers, from the rear of the projection screen, and coordinate calculating means that analyzes the image taken by the imaging means to detect the two-dimensional positions in the detection areas where the light rays from the pointers are detected.