| 摘要 |
PROBLEM TO BE SOLVED: To provide a recording medium detector of simple constitution capable of finding accurately and stably thicknesses and kinds of various recording media different in quality during conveyance. SOLUTION: This detector is provided with an ultrasonic oscillator 11 for emitting an ultrasonic wave toward the recording medium P conveyed in a conveying passage inside an image forming device, a transmitted ultrasonic wave receiver 12 for detecting the ultrasonic wave transmitted through the recording medium P, a reflected ultrasonic wave receiver 13 for detecting the ultrasonic wave reflected by the recording medium P, and a control means 16 for reading detection signals in the respective receivers to conduct computation processing. COPYRIGHT: (C)2004,JPO |
