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US 7,607,352 B2Granted
Ultrasonic sensor transmitting and receiving ultrasonic frequencies adjusted according to temperature
AssigneeDenso Corporation
InventorNoboru Endou
Life of this patent
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AssigneeDenso Corporation
InventorNoboru Endou
Estimating the term…
Components of an ultrasonic sensor are contained in a cylindrical casing having an end wall closing one end of the casing. A vibrator such as a piezoelectric element is disposed in the casing in contact with the end wall. An integrated circuit chip that includes a signal generator, a filter device and a temperature sensor is contained in the casing. Vibrations generated in the vibrator are transferred to the end wall that transmits ultrasonic waves. Ultrasonic waves received by the end wall are converted into electrical signals in the vibrator. Frequency of the transmitting signals and a frequency region of the signals to be received are controlled according to the ambient temperature, so that they always coincide with a resonant frequency of the end wall which changes according to the ambient temperature. Thus, high transmitting/receiving efficiency is always realized, irrespective of the ambient temperature.
An ultrasonic sensor comprising:
An ultrasonic sensor comprising:
Dependencies are inferred from the claim text.