Body detecting device
First Claim
Patent Images
1. A device for detecting a body at a predetermined position comprising:
- means for generating a detecting signal;
receiver means for receiving the signal from said signal generating means;
means for setting the value of a reference signal in response to the signal received from said receiver means in the absence of a said body at said predetermined position, to correct said reference signal in response to variations in ambient conditions, wherein said reference signal is for providing a reference for use in determining whether a said body is present at said predetermined position;
means for storing the reference signal, andcomparator means connected to compare said reference signal from said storage means with a signal received by said receiver means, wherein the output of said comparator means provides an indication of the presence or absence of said body at said predetermined position.
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Abstract
A device for detecting a body comprises transmitter means, receiver means for receiving the signal from the transmitter means, means for setting the level of a reference signal by the reception signal from the receiver means provided when the body is in a reference condition, to correct the reference signal, which reference signal provides a reference for identifying the reception signal, and comparator means for identifying the reception signal in accordance with the reference level connected to the reference level setting means. The body detecting device effects the detection by the output of the comparator means.
24 Citations
15 Claims
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1. A device for detecting a body at a predetermined position comprising:
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means for generating a detecting signal; receiver means for receiving the signal from said signal generating means; means for setting the value of a reference signal in response to the signal received from said receiver means in the absence of a said body at said predetermined position, to correct said reference signal in response to variations in ambient conditions, wherein said reference signal is for providing a reference for use in determining whether a said body is present at said predetermined position; means for storing the reference signal, and comparator means connected to compare said reference signal from said storage means with a signal received by said receiver means, wherein the output of said comparator means provides an indication of the presence or absence of said body at said predetermined position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for detecting the presence of copying paper at a predetermined position in a copying machine by using ultrasound signals comprising:
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means for generating ultrasound signals; ultrasound signal receiver means for receiving the ultrasound signals from said generating means, said ultrasound signal generating means and receiver means being disposed on opposite sides of a copying paper passage; shielding means for protecting the ultrasound signals varied by the interruption of copy paper to be detected from being influenced by ultrasound signals reflected or refracted by elements other than the paper to be detected, and from being influenced by the quality of the paper; a conversion circuit for converting a signal received by said ultrasound receiver means to an electric signal; and means for comparing an output signal from said circuit to a reference signal and for generating an electric signal representing the presence of the paper. - View Dependent Claims (11, 12, 13)
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14. A device for detecting a body comprising:
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means for generating ultrasound signals; receiver means for receiving the ultrasound signals from said generating means, said receiver means including an ultrasound receiver and an acoustic-electric converter; means for setting the value of a reference signal in response to the ultrasound signals received by said receiver means while the body is in a reference condition to adjust the reference signal in response to changes in ambient conditions, the reference signal providing a reference for use in determining whether or not the body is present between said generator and receiver means; means for storing the reference signal; comparator means for comparing a signal received by said receiver means with a signal provided by said storing means; and means for converting the electrically converted received signal into a DC voltage level signal, the output of said converter being applied to said storing means to said comparator means, whereby a transparent body may be detected.
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15. A device for detecting copying paper in a copying machine comprising:
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means for generating ultrasound signals; receiver means for receiving the ultrasound signals from said generating means, said receiver means including an ultrasound receiver and an acoustic-electric converter; means for setting the value of a reference signal in response to the ultrasound signals received by said receiver means while the paper is in a reference condition to adjust the reference signal in response to changes in ambient conditions, the reference signal providing a reference for use in determining whether or not the paper is present between said generator and receiver means; means for storing the reference signal comparator means for comparing a signal received by said receiver means with a signal provided by said storing means; and means for converting the electrically converted received signal into a DC voltage level signal, the output of said converter being applied to said storing means and to said comparator means, whereby a transparent paper may be detected.
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Specification