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. 31, 2009
Filed:
Jun. 20, 2007
Nobutaka Itagaki, Tokyo, JP;
Nobutaka Itagaki, Tokyo, JP;
Avago Technologies ECBU IP (Singapore) Pte. Ltd., Singapore, SG;
Abstract
A pointing device includes a light source, an aperture member, and a detector. The light source provides incident light for illuminating an obverse surface of a plate at a predetermined incident angle. The plate has the obverse surface and a reverse surface and is transparent to the wavelength of the incident light. The aperture member has an opening through which speckle light from the obverse surface and speckle light from the reverse surface pass. The speckle light results from the incident light. The detector detects the intensity of the speckle light passing through the opening. In order that the speckle light from the obverse surface and the speckle light from the reverse surface overlap each other at the detector, the opening has a longitudinal dimension in a direction in which the incident angle is formed.