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:
Aug. 15, 2000
Filed:
Oct. 22, 1998
Keiji Miyamoto, Tokyo, JP;
Masahiko Sano, Tokyo, JP;
Naoki Oda, Tokyo, JP;
Junshiro Motoyama, Osaka, JP;
NEC Corporation, Tokyo, JP;
Abstract
A background heat source unit 4 having a plurality of heat sources, which are arranged substantially at a fixed interval and set to a temperature different from the body temperature of passenger and also from the ambient temperature, and an infrared sensor 7, are disposed such that they face each other via a passenger. Whether a passenger is present is checked according to the result of a check, made by comparing a detected temperature pattern of the background heat source unit 4, detected by the infrared sensor 7, and a reference temperature pattern of the background heat source unit 4, preliminarily stored in a control circuit 17, as to whether a non-identical area is present in the compared temperature patterns.