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. 31, 2013
Filed:
Mar. 21, 2012
Makiko Sugiura, Hekinan, JP;
Yasuyuki Okuda, Aichi-gun, JP;
Takaaki Kawai, Obu, JP;
Takahiko Yoshida, Okazaki, JP;
Hisanaga Matsuoka, Okazaki, JP;
Toshiki Isogai, Nagoya, JP;
Mitsuyasu Matsuura, Chiryu, JP;
Makiko Sugiura, Hekinan, JP;
Yasuyuki Okuda, Aichi-gun, JP;
Takaaki Kawai, Obu, JP;
Takahiko Yoshida, Okazaki, JP;
Hisanaga Matsuoka, Okazaki, JP;
Toshiki Isogai, Nagoya, JP;
Mitsuyasu Matsuura, Chiryu, JP;
DENSO CORPORATION, Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
An ultrasonic sensor includes a transmitting device, a receiving device, and a circuit device. The circuit device determines that the receiving device receives an ultrasonic wave reflected from an object, when an output voltage of the receiving device is equal to or greater than a first threshold. The circuit device includes a humidity detection section configured to detect an ambient humidity of the transmitting and receiving devices and a threshold adjustment section configured to calculate, based on the detected ambient humidity, a sound pressure of the ultrasonic wave that is received by the receiving device after propagating over a round-trip distance between the ultrasonic sensor and the object. The threshold adjustment section reduces the first threshold, when the output voltage corresponding to the calculated sound pressure is less than a second threshold that is greater the first threshold.