ULTRASONIC CONTROL DEVICE AND RECORDING MATERIAL DISCRIMINATION DEVICE

WIPO Patent Application WO/2011/074061

A1

In a device for detecting the basis weight of a recording material (P), the number of pulses of a driving signal which drives ultrasound is determined by a measurement performed in the state where no recording material (P) is present, and the number of pulses for detecting the basis weight of the recording material (P) is a fixed value. For this reason, it is impossible to set the optimal number of pulses in accordance with the basis weight of the recording material (P) and this is one of the causes of deterioration in the detection accuracy for the recording material (P). An initial measurement is performed with the ultrasound passing through the recording material (P), and first, the recording material (P) is roughly classified. By changing the number of pulses of the driving signal in accordance with the result of the initial measurement, the basis weight of the recording material (P) can be detected with the ultrasound suited to the recording material (P), and therefore it is possible to increase the detection accuracy for the basis weight of the recording material (P).

NAKAMURA TOMOHARU (JP)
MATSUI NORIO (JP)
KOYAMA SHOICHI (JP)
ISHIDA TSUTOMU (JP)
EBIHARA SHUN-ICHI (JP)

PCT/JP2009/070857

June 23, 2011

December 14, 2009

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CANON KK (JP)
NAKAMURA TOMOHARU (JP)
MATSUI NORIO (JP)
KOYAMA SHOICHI (JP)
ISHIDA TSUTOMU (JP)
EBIHARA SHUN-ICHI (JP)

G01N29/00; G03G21/00

JP2007022793A	2007-02-01
JP2004231404A	2004-08-19
JP2009161291A	2009-07-23
JP2006264927A	2006-10-05
JP2009173359A	2009-08-06

ABE, Takuma et al. (JP)
Takuma Abe (JP)

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