Proximity sensor
First Claim
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1. A proximity sensor comprising:
- an electrically conductive member integrally or separably mounted on a mounting object,a detection area made of an electromagnetic wave radiation space set at an outside of the said electrically conductive member and accompanying a change of a humidity, a temperature and a barometric pressure, anda microwave circuit making the said electrically conductive member act as an antenna and radiate microwaves of a sufficiently short wavelength relative to a size of the said electrically conductive member so as to detect an existence of a detection object residing in a space inside the said detection area as a change of an eigenvalue of a radio wave propagation, thereby detecting the change of the said eigenvalue by the said microwave circuit as a change of the said detection area,wherein the change of the eigenvalue of the said radio wave propagation is detected by use of a mixer, which makes the frequency of the said electrically conductive member passed through a directional coupler connected to the feeding point of the UWB oscillator and a bandpass filter and thereafter amplified by an amplifying means while inputting a down-converting frequency for mixing, and a recognition circuit detecting the change of the said detection area by a frequency passed through the said mixer.
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Abstract
A microwave oscillating portion 30 has an output oscillator function that is capable of adjusting automatically a frequency of microwaves radiated from an electrically conductive member made of an outer panel 11-14 as an antenna at a specific frequency of a sufficiently short wavelength in relation to a size of the electrically conductive member made of the outer panel 11-14. The microwave oscillating portion 30 can detect a human and an object of a detection object 27 in a detection area 11A-14A set at an outside of the outer panel 11-14 that is integrally or separably mounted on a vehicle 1.
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Citations
11 Claims
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1. A proximity sensor comprising:
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an electrically conductive member integrally or separably mounted on a mounting object, a detection area made of an electromagnetic wave radiation space set at an outside of the said electrically conductive member and accompanying a change of a humidity, a temperature and a barometric pressure, and a microwave circuit making the said electrically conductive member act as an antenna and radiate microwaves of a sufficiently short wavelength relative to a size of the said electrically conductive member so as to detect an existence of a detection object residing in a space inside the said detection area as a change of an eigenvalue of a radio wave propagation, thereby detecting the change of the said eigenvalue by the said microwave circuit as a change of the said detection area, wherein the change of the eigenvalue of the said radio wave propagation is detected by use of a mixer, which makes the frequency of the said electrically conductive member passed through a directional coupler connected to the feeding point of the UWB oscillator and a bandpass filter and thereafter amplified by an amplifying means while inputting a down-converting frequency for mixing, and a recognition circuit detecting the change of the said detection area by a frequency passed through the said mixer. - View Dependent Claims (2, 3, 4, 5, 11)
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6. A proximity sensor comprising an electrically conductive member integrally or separably mounted on a mounting object, a detection area made of an electromagnetic wave radiation space set at an outside of the said electrically conductive member and accompanying a change of a humidity, a temperature and a barometric pressure, and a microwave circuit making the said electrically conductive member act as an antenna and radiate microwaves of a sufficiently short wavelength relative to a size of the said electrically conductive member so as to detect an existence of a detection object residing in a space inside the said detection area as a change of an eigenvalue of a radio wave propagation, thereby detecting the change of the said eigenvalue by the said microwave circuit as a change of the said detection area,
wherein the said microwave circuit comprises a microwave oscillating portion forming a resonant circuit of the microwaves including the said detection area the said microwave oscillating portion comprising either of a first device and a second device, the first device including an output oscillator supplying a frequency producing the microwaves radiated from the said electrically conductive member, a mixer mixing a frequency of the microwaves obtained from the electrically conductive member and a frequency obtained from a time-base generator so as to detect a predetermined frequency, a bandpass filter selecting only a specific frequency from a frequency mixed by the said mixer and a feedback system feeding back to the said output oscillator by a frequency passed through the said bandpass filter, and the second device including a recognition circuit distinguishing the change of the said detection area by a standing wave of a frequency passed through the said bandpass filter.
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7. A proximity sensor comprising:
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an electrically conductive member integrally or separably mounted on a mounting object, a detection area made of an electromagnetic wave radiation space set at an outside of the said electrically conductive member and accompanying a change of a humidity, a temperature and a barometric pressure, and a microwave circuit making the said electrically conductive member act as an antenna and radiate microwaves of a sufficiently short wavelength relative to a size of the said electrically conductive member so as to detect an existence of a detection object residing in a space inside the said detection area as a change of an eigenvalue of a radio wave propagation, thereby detecting the change of the said eigenvalue by the said microwave circuit as a change of the said detection area, wherein the said microwave circuit comprises an output oscillator outputting the microwaves to the said electrically conductive member and a deemed circuit deemed as a cavity resonant circuit is formed between the said electrically conductive member and a detection object in the said detection area when the detection object resides in the detection area set at the outside of the said electrically conductive member, thereby obtaining a frequency of the said deemed circuit from the said output oscillator so as to detect the detection object in the said detection area as a change of an oscillating frequency of the said output oscillator, and further comprising, at an output side of the said output oscillator, a mixer mixing the frequency outputted from the said output oscillator and a frequency obtained from a time-base generator and a recognition circuit recognizing the detection object inside the detection area set at the outside of the said electrically conductive member. - View Dependent Claims (8)
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9. A proximity sensor comprising:
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an electrically conductive member integrally or separably mounted on a mounting object, a detection area made of an electromagnetic wave radiation space set at an outside of the said electrically conductive member and accompanying a change of a humidity, a temperature and a barometric pressure, and a microwave circuit making the said electrically conductive member act as an antenna and radiate microwaves of a sufficiently short wavelength relative to a size of the said electrically conductive member so as to detect an existence of a detection object residing in a space inside the said detection area as a change of an eigenvalue of a radio wave propagation, thereby detecting the change of the said eigenvalue by the said microwave circuit as a change of the said detection area, wherein an oscillating circuit oscillating the microwaves is made by setting a feeding point and a receiving point are set on the said electrically conductive member of the said microwave circuit and amplifying a frequency obtained from the said receiving point and feeding back the said frequency to the said feeding point, thereby detecting the change of the said detection area as a change of a frequency obtained from the said oscillating circuit. - View Dependent Claims (10)
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Specification