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:
Mar. 24, 1981
Filed:
Nov. 21, 1978
Kiyoko Shigeta, Kodaira, JP;
Shuntetsu Matsumoto, Kodaira, JP;
Naotake Ooyama, Kanagawa, JP;
Takashi Imai, Tokyo, JP;
Agency of Industrial Science & Technology, Tokyo, JP;
Ministry of International Trade & Industry, Tokyo, JP;
Abstract
The system for collection and transmission of road traffic information comprises a lens system installed on a tall structure such as on the roof of a building and angled vertically or diagonally to include in its field of view a road area subjected to observation and a plurality of photoelectric conversion elements disposed on the focal plane of the lens system along the image of the road area to be formed on the focal plane. The plurality of photoelectric conversion elements are formed in shapes successively decreased in width and length in conformity with the perspective view of the road area formed on the focal plane of the lens system. This system operates on the principle that when a vehicle enters the road area under observation by this system, it causes a change in the brightness of the image of the road area formed on the focal plane of the lens system, the changed brightness of the image induces a corresponding change in the outputs of the photoelectric conversion elements, and the resultant change in the outputs on being processed by scanning gives rise to a series of pulse signals, which are transmitted to a traffic control center.