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:
May. 12, 1987
Filed:
Aug. 28, 1985
Takeshi Ikeyama, Tokyo, JP;
Aisin Seiki Kabushiki Kaisha, , JP;
Abstract
A device for measuring heartbeats of a driver using a multiplicity of optical heartbeat sensors which are dispersed about the rim of steering wheel. Fluctuation (variance) in the period of a heartbeat signal is measured and compared with a reference value to decide the presence or absence of abnormality. The presence of abnormality is signaled by a visual indication and acoustic output. The reference value is set based on the value which was obtained from the actual heartbeat measurement of the driver in a reference value setting mode. The reference value is stored in a non-volatile read/write memory to be held even when the power is off. The difference in output levels of a light receiving element between when a light emitting element is energized and when it is deenergized, is checked for each heartbeat sensor to decide whether a heartbeat signal has been actually obtained therefrom. As a result of the decision, only those heartbeat sensors actually issuing the heartbeat signals are selectively utilized for making the measurement.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile