Grammage detection sensor of recording medium and image forming apparatus
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United States of America Patent
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Mar 31, 2015
Grant Date -
Nov 22, 2012
app pub date -
Aug 2, 2012
filing date -
Jun 13, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A grammage detection sensor which detects a grammage of a recording medium using an ultrasonic wave includes a transmitting unit configured to transmit the ultrasonic wave and a receiving unit including a first vibration member configured to receive the ultrasonic wave that is transmitted from the transmitting unit and passes through the recording medium. The receiving unit includes a guide member configured to guide the ultrasonic wave that passes through the recording medium to the first vibration member. A length from a surface of the first vibration member to a plane including an end plane of the guide member along a line that passes through a center of the first vibration member and is perpendicular to the first vibration member is approximately n times of one-half wavelength of the ultrasonic wave transmitted from the transmitting unit where n is an integer of one or greater.
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