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:
Oct. 20, 1992
Filed:
May. 23, 1991
Joji Tajima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A distance information obtaining device which uses an image pickup device, to pick up an optical image of an object and produce a picture signal, and a signal processor which process the signal picture and calculates therefrom the distance between the object and the pickup device. A corrective filter is located along the optical path, which includes both an illuminating beam and a beam reflected off of the object, in order to correct the spectral characteristics of the light beam, the sensors located in the image pickup device and the color of the object. The corrective filters can be placed in various positions along the path. A method is provided to interchange various corrective filters according to the characteristics of the object.