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:
Dec. 30, 2008
Filed:
Mar. 06, 2006
Hirohisa Suzuki, Moriguchi, JP;
Hiroshi Saito, Moriguchi, JP;
Eiichiro Kuwako, Moriguchi, JP;
Takashi Kunimi, Tokyo, JP;
Hirohisa Suzuki, Moriguchi, JP;
Hiroshi Saito, Moriguchi, JP;
Eiichiro Kuwako, Moriguchi, JP;
Takashi Kunimi, Tokyo, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Akebono Brake Industry Co., Ltd., Tokyo, JP;
Abstract
A tire inflation pressure determining system is provided in which measurement results are transmitted to the exterior without providing a high precision oscillation circuit to a tire-mounted air pressure determining system. An LC resonance circuit is composed of a coil Ls and an inflation pressure sensor in which the electric capacitance varies in accordance with tire air pressure. The fluctuations of the electromagnetic field having a frequency fgenerated by a sensor control unit are sensed in a coil L, a clock is generated based on the sensed fluctuations, the clock is inputted to a coil Le that is transformer coupled to the coil Ls, and the LC resonance circuit is excited. The output voltage of the LC resonance circuit is converted to digital data in an A/D conversion circuit in correspondence with the intensity of the resonance, the impedance of the coil Lis varied in accordance with the bit sequence constituting the data, and a modulation is thereby generated in the voltage of a coil Lof the sensor control unit via the electromagnetic field.