Body sensing device
First Claim
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1. A body sensing device, comprising:
- an oscillator having a coil, said oscillator configured to stop an oscillation of a high frequency signal when a body to be detected thereby exists near said coil, anda controller configured to detect the stop of the oscillation of said oscillator,wherein said high frequency has such a frequency that said oscillator stops the oscillation in response to an approach by a non-magnetic body or a non-metal body, andwherein said coil is configured to output a signal having a quality factor below a predetermined value when said non-magnetic body or said non-metal body approaches said coil, and to output the signal having a quality factor above the predetermined value when a magnetic body, a metal body or no object approaches said coil.
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Abstract
An improved body sensing device capable of precisely sensing a living body at a standstill by discriminating the living body from other substances than the living body. An oscillator provided with a detection coil oscillates a high frequency signal. As there is no object or exists baggage or the like near the detection coil, the oscillator oscillates and generates a high frequency signal at a high level to be detected by a detector for turning on a transistor of a controller. As there exists a human body near the oscillator, the oscillation stops and the input signal from the detector to the transistor is extremely lowered, so that the transistor is turned off.
43 Citations
20 Claims
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1. A body sensing device, comprising:
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an oscillator having a coil, said oscillator configured to stop an oscillation of a high frequency signal when a body to be detected thereby exists near said coil, and a controller configured to detect the stop of the oscillation of said oscillator, wherein said high frequency has such a frequency that said oscillator stops the oscillation in response to an approach by a non-magnetic body or a non-metal body, and wherein said coil is configured to output a signal having a quality factor below a predetermined value when said non-magnetic body or said non-metal body approaches said coil, and to output the signal having a quality factor above the predetermined value when a magnetic body, a metal body or no object approaches said coil. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A living body sensing device, comprising:
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a coil for sensing a living body, a discriminating circuit connected with said coil for discriminating an approach of said living body, a circuit housing enclosing said discriminating circuit, wherein a size of said coil in any horizontal direction is larger than a size of said circuit housing in any horizontal direction, and wherein said coil is configured to output a signal having a quality factor above a predetermined value when a magnetic body or no object approaches said coil, and to output a signal having a quality factor below the predetermined value when said living body approaches said coil. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A living body sensing device, comprising.
an oscillator including a coil, said oscillator generating a high frequency signal having a different amplitude depending upon whether or not a living body exists near said coil, the amplitude of the high frequency signal being generated based on an output signal of said coil, the output signal of said coil having a quality factor below a predetermined value when the living body exists near said coil, and having a quality factor above the predetermined value when the living body does not exist near said coil, a detector for detecting an output signal generated from said oscillator, and a controller for discriminating an existence or absence of the living body in accordance with a magnitude of an output signal generated from said detector.
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19. A living body sensing device, comprising:
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an oscillator including a coil, said oscillator generating a high frequency signal having a different amplitude depending upon whether or not a living body exists near said coil, a detector for detecting an output signal generated from said oscillator to generate a detection signal, a controller for discriminating an existence or absence of the living body in accordance with a magnitude of the output signal generated from said detector, and a frequency detector for detecting an output frequency of said oscillator, wherein said controller determines the absence of the living body regardless of an amplitude of said detection signal when the output frequency detected by said frequency detector is higher than a predetermined frequency which sets a maximum frequency in which the detection of the living body is made. - View Dependent Claims (20)
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Specification