Patent US4204531A successfully refreshed from Google Patents.
EP0175362A2
Expired / Lapsed
EP
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Capacitive-type detection device
Assignee: Omron Corp
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Filing: 1985-09-18
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Granted: —
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Expires: 2005-09-18
Abstract
Abstract A detection device comprising a detection wall member for sensing a predetermined existence of an object adjacent to the device, detection electrode member including a detection electrode and a ground electrode which are disposed in the detection wall member, oscillation circuit member including a resonance circuit associated with a capacitance between the detection and ground electrodes, and detection circuit member for detecting change of oscillation of the oscillation circuit member by change of the capacitance between the electrodes so that the predetermined existence of the object adjacent to the detection wall member is detected by the device.
Inventors
- 👤 Akihiro C/O Omron Tateisi Electr. Co. Okushima
- 👤 Shinichi C/O Omron Tateisi Electronics Co. Shoji
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 16:13
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955; B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; B60S1/0818; B60S1/0822; B60S1/0825; B60S1/0829; B60S1/0874; B60S1/0885; Y; Y10; Y10S; Y10S15/00; Y10S15/15
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
96 words
A detection device comprising detection wall means for sensing a predetermined existence of an object adjacent to the device, detection electrode means including a detection electrode and a ground electrode which are disposed in said detection wall means, oscillation circuit means including a resonance circuit associated with a capacitance between said detection and ground electrodes, and detection circuit means for detecting change of oscillation of said oscillation circuit means by change of said capacitance between the electrodes so that the predetermined existence of said object adjacent to said detection wall means be detected by said device.
Claim 2
Dependent Claim
96 words
A detection device comprising detection wall means for sensing a predetermined existence of an object adjacent to the device, detection electrode means including a detection electrode and a ground electrode which are disposed in said detection wall means, oscillation circuit means including a resonance circuit associated with a capacitance between said detection and ground electrodes, and detection circuit means for detecting change of oscillation of said oscillation circuit means by change of said capacitance between the electrodes so that the predetermined existence of said object adjacent to said detection wall means be detected by said device.
Claim 3
Dependent Claim
54 words
A detection device according to Claim 1 wherein said object is liquid and said oscillation circuit means is designed to oscillate at a frequency so that change of the oscillation by the existence of drops of said liquid adjacent to the detection wall means is larger than that by a film of said liquid.
Claim 4
Dependent Claim
43 words
A detection device according to Claim 1 further comprising housing means for housing the device, wherein said detection wall means is a portion of said housing means and said detection electrode means is mounted on a predetermined surface of said detection wall means.
Claim 5
Dependent Claim
23 words
A detection device according to Claim 1 wherein said detection electrode means further includes a detection sub-electrode between said detection and ground electrodes.
Claim 6
Dependent Claim
43 words
A detection device according to Claim 4 wherein said oscillation circuit means oscillates at a resonance frequency of a bridge circuit including the capacitance between said detection electrode and said detection sub-electrode and the capacitance between said detection electrode and said ground electrode.
Claim 7
Dependent Claim
47 words
A detection device according to Claim 2 wherein said detection circuit means includes a comparator comparing an oscillation amplitude of said oscillation circuit means with a predetermined reference level so as to detect the existence of the drops of said liquid adjacent to the detection wall means.
Claim 8
Dependent Claim
39 words
A detection device according to Claim 1 further comprising wiper driving means in response to said detection circuit means for generating a signal to drive a windshield wiper system for wiping said object adjacent to said detection wall means.
Claim 9
Dependent Claim
32 words
A detection device according to Claim 7 wherein said wiper driving means generates said signal in a cycle varying according to volume of said object after wiping by said windshield wiper system.
Claim 10
Dependent Claim
23 words
A detection device according to Claim 1 further comprising housing means adapted to mount said device on a predetermined surface of a windshield.
Claim 11
Dependent Claim
27 words
A detection device according to Claim 9 wherein said windshield is of an automobile vehicle and said device is mounted behind a rearview mirror of said vehicle.
Claim 12
Dependent Claim
27 words
A detection device according to Claim 9 wherein said windshield is of an automobile vehicle and said device is mounted in a dash board of said vehicle.
Claim 13
Dependent Claim
12 words
A detection device according to Claim 1 wherein said object is water.
Claim 14
Dependent Claim
133 words
A detection device mounted on a windshield to detect water adhering to an external surface of the windshield to be wiped by a windshield wiping system comprising housing means including a detection wall member mounted on an inner surface of said windshield, detection electrode means including a detection electrode and a ground electrode which are disposed on said detection wall member, oscillation circuit means including a resonance circuit associates with a capacitance between said detection and ground electrodes, and detection circuit means for detecting change of oscillation of said oscillation circuit means by change of said capacitance between the electrode according to the existence of water on said external surface of said windshield whereby a predetermined status of water on the windshield is detected by the device to drive said windshield wiping system.
Claim 15
Dependent Claim
133 words
A detection device mounted on a windshield to detect water adhering to an external surface of the windshield to be wiped by a windshield wiping system comprising housing means including a detection wall member mounted on an inner surface of said windshield, detection electrode means including a detection electrode and a ground electrode which are disposed on said detection wall member, oscillation circuit means including a resonance circuit associates with a capacitance between said detection and ground electrodes, and detection circuit means for detecting change of oscillation of said oscillation circuit means by change of said capacitance between the electrode according to the existence of water on said external surface of said windshield whereby a predetermined status of water on the windshield is detected by the device to drive said windshield wiping system.
References Cited (Backward Citations)
No citation records indexed.
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