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. 19, 1991
Filed:
Feb. 16, 1990
Applicant:
Inventor:
Alexander M Purcell, Guilford, CT (US);
Assignee:
Summagraphics Corporation, Seymour, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08C / ;
U.S. Cl.
CPC ...
178 18 ; 173 19 ; 173 18 ; 362 33 ; 362 92 ;
Abstract
An optical device comprising a sheet of optical fibers having different lengths so that the fiber ends are distributed uniformly over a given area. The device is mounted in a digitizer tablet above or below its electrode array. When light is pumped into the free fiber ends, a pattern of light spots are formed which can be spread out to illuminate the tablet's working surface. When driven by a light pen, a similar optical device can be used to locate the light pen for menu-picking functions.