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:
May. 31, 1994
Filed:
Nov. 12, 1992
John J Uebbing, Palo Alto, CA (US);
Thomas J Lugaresi, Los Gatos, CA (US);
David Pitou, Meridian, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An encapsulated reflective sensor for use in conjunction with a code wheel for determining the motion and position of a shaft has a light emitting device and photodetector array contained within a transparent encapsulant. The encapsulant has a convex curved surface which prevents light from the light emitting device from impinging on the photodetector array. An emitter lens is formed by the convex curved surface between the light emitting device and the code wheel. The emitter lens magnifies and concentrates the light toward the code wheel. As the code wheel turns with the shaft, the light incident on the wheel is modulated and reflected toward the photodetector array. A second detector lens may be used between the code wheel and photodetector array for concentrating the modulated light reflected from the code wheel toward the photodetector array.