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. 22, 1995
Filed:
Sep. 20, 1993
Applicant:
Inventors:
Assignees:
Ricoh Company, Ltd., Tokyo, JP;
Ricoh Research Institute of General Electronics Co., Ltd., Natori, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08C / ; G09G / ;
U.S. Cl.
CPC ...
178 18 ; 345166 ;
Abstract
A pen input device is provided with a tablet having a top surface and a plurality of reference lines provided at a constant pitch on the top surface in mutually perpendicular directions, and a pointing device having a tip end, a first device for irradiating light on the tablet via the tip end, and a second device for detecting a moving direction and a moving quantity of the tip end of the pointing device on the tablet and a distance between the tip end of the pointing device and the top surface of the tablet based on scattered light received from the tablet.