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:
Jun. 27, 1978
Filed:
Feb. 09, 1977
Kent E Erickson, Brookside, NJ (US);
Keuffel & Esser Company, Morristown, NJ (US);
Abstract
Means for producing a counter reset pulse at the precise zero datum in an electro-optical measuring device comprises a sub-assembly including a light source, a patterned reticle, and a pair of photosensors, and a cooperating imaging reflector element. Each of the sub-assembly and reflector element are respectively mounted on the separate portions of the measuring device between which relative movement is effected during the measuring operation. Light from the source illuminates a pair of parallel transparent slots in the reticle pattern and is imaged back upon a second pair of transparent windows in the same reticle by the reflector element and is incident upon a pair of photosensors, each of which is associated with one of the windows. Equal illumination of each of the photosensors establishes the precise zero datum in the device and associated electronics provides a counter resetting pulse at that position.