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:
Apr. 18, 1995
Filed:
Sep. 01, 1993
Applicant:
Inventor:
Toshiyuki Kumakura, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; A61B / ; H04N / ;
U.S. Cl.
CPC ...
354410 ; 348317 ; 351210 ;
Abstract
An image processing apparatus for visual axis detection in which a frame transfer type CCD is used as an area sensor for converting an incident eyeball image into an electrical signal. Use of the frame transfer type LCD will widen the light receiving area on the surface of the CCD and enhance the numerical aperture, as to well as greatly enhance the probability of detection of Purkinje's image and enhance the sensitivity to the infrared range to thereby make the Purkinje's image detectable by a smaller quantity of illumination.
Kumakura, Toshiyuki. (1995). Visual axis detecting device (U.S. Patent No. 5408292). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5408292
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