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:
Jan. 30, 1979
Filed:
Dec. 27, 1976
Mamoru Hayamizu, Tokyo, JP;
Yasushi Tanigaki, Tokyo, JP;
Abstract
A beam of light from a light source is reflected by a polyhedral mirror which is continuously rotating in a constant speed around its axis. The reflected beam sweeps on an object and passes a predetermined point of the object surface. A dispersed light from the point is formed into a beam through a set of slits and reaches a light detector. The polyhedral mirror has a plurality of mirror surfaces each of which is spaced at a distance from the rotary axis thereof, different from the adjacent mirrors. A pair of targets are arranged in the beam axis to the light detector. Dispersed light beams from both upper and lower targets also reach into the light detector. The distance between a point of the object and the beam line from the light source is computed from the distances of the mirror surfaces from the rotary axis of the polyhedral mirror, the distance between the upper and lower targets and the inclination angles of the mirror surfaces from the beam line, and the angles of the reflected beam hitting the predetermined point or the targets.