Recording material determination device and image forming apparatus

摘要

A recording material determination device includes an ultrasonic wave transmission unit configured to transmit an ultrasonic wave to a recording material based on a driving signal, an ultrasonic wave receiving unit configured to receive the ultrasonic wave, a light exposure unit configured to expose the recording material to light, a light receiving unit configured to receive light, an amplification unit configured to amplify an ultrasonic wave received by the ultrasonic wave receiving unit to a first output value, and after the amplification unit amplifies the ultrasonic wave received by the ultrasonic wave receiving unit to the first output value, a control unit performs control so as to obtain the second output value by the light exposure unit and the light receiving unit during a period of time after the amplification of the ultrasonic wave is stopped and before the next ultrasonic wave comes to be transmittable.

主权项

1. A recording material determination device comprising:
an ultrasonic wave transmission unit configured to transmit an ultrasonic wave a plurality of times to a recording material; an ultrasonic wave receiving unit configured to receive the ultrasonic wave transmitted via the recording material after the ultrasonic wave is transmitted by the ultrasonic wave transmission unit and output a first signal and a second signal corresponding to the ultrasonic wave received by the ultrasonic wave receiving unit; a processing unit configured to perform processing with respect to the first signal and the second signal output by the ultrasonic wave receiving unit; a light emission unit configured to emit light to the recording material; a light receiving unit configured to receive light emitted by the light emission unit via the recording material and output a third signal corresponding to the received light; and a control unit configured to determine a basis weight of the recording material based on a result obtained by performing processing with respect to the first signal and the second signal by the processing unit, and respectively correspond to a first ultrasonic wave transmitted by the ultrasonic wave transmission unit to the recording material and received by the ultrasonic wave receiving unit via the recording material, and a second ultrasonic wave transmitted by the ultrasonic wave transmission unit to the recording material to which the first ultrasonic wave is transmitted, and received by the ultrasonic wave receiving unit via the recording material to which the first ultrasonic wave is transmitted, and determine a surface condition of the recording material based on the third signal which is output by the light receiving unit and corresponds to light emitted by the light emission unit to the recording material and received by the light receiving unit via the recording material, wherein, during a first period of time that is after the ultrasonic wave transmission unit starts transmitting the first ultrasonic wave and before the processing unit stops performing processing with respect to the first signal, the light receiving unit doesn't output the third signal, and during a second period of time that is after the processing unit stops performing processing with respect to the first signal and before the ultrasonic wave transmission unit starts transmitting the second ultrasonic wave, the light receiving unit outputs the third signal.