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:
Oct. 25, 1994
Filed:
May. 21, 1992
L Stephen Pilcher, N. Ferrisburg, VT (US);
Donald S Odell, Burlington, VT (US);
Selectech, Ltd., Colchester, VT (US);
Abstract
An improved optical pointing device utilizing a moveable unit having a voltage-to-frequency converter (VFC). The VFC emits pulses with separation proportional to the angular rotative and/or translational position of the moveable unit, which pulses are applied to an LED of the moveable unit. A microcomputer in a base unit measures separation of the pulses received by a photodetector to determine the components of the angular rotative and/or translational position of the moveable unit. In accordance with another aspect, automatic gain control circuitry is located in the moveable unit, thereby eliminating the need for two-way communication to achieve consistency of operation in a prescribed space.