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:
Sep. 22, 1998
Filed:
Dec. 15, 1995
Michael Hercher, Marblehead, MA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A device for measuring the displacement of a movable object includes a stationary light source that produces an incident light beam. A target feature, attached to, or integral with, the object, reflects the incident light beam. A stationary photodetector, spaced from the object, receives the reflected light beam and, in response thereto, produces an electric signal having a characteristic (such as amplituded) which is proportional to a received location on the photodetector of the reflected light beam and which represents a position of the object. An imaging lens receives the reflected light beam and focusses an image of the light source on the photodetector. The target feature includes a curved surface that reflects the light beam such that a small, point-like or line-like image of the light source is focussed on the photodetector. The displacement sensor device is particularly useful in a disk drive servo system application.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile