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:
Feb. 19, 1991
Filed:
May. 10, 1988
Hitachi, Ltd., Tokyo, JP;
Abstract
A scanning method used by a laser radar for scanning a predetermined scanning region with a laser beam so that the whole of the scanning region is illuminated with the laser beam, is disclosed in which a laser beam makes a first spiral scanning outwardly or inwardly and then makes a second spiral scanning inwardly or outwardly so that the rotational direction of the second spiral scanning is the same as that of the first spiral scanning, and the first spiral scanning and the second spiral scanning are repeated. According to this scanning method, the output of drive means for driving an optical system which causes a laser beam to perform a scanning, can be reduced, since a maximum power necessary for causing a body large in inertia to make a curvilinear or rotational motion is far smaller than a maximum power necessary for causing the body to make a linear motion.