US4378504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity switch
Assignee: Omron Corp
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Filing: 1982-04-02
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Granted: 1983-03-29
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Expires: 2002-04-02
Abstract
Abstract A high-frequency oscillation type proximity switch comprising a resonance circuit in which a detection coil is used as a pickup for sensing the approach of an object thereto and a resonance capacitor is disposed at a position very close to the detection coil so that the resistance of a cable connecting the resonance circuit to its associated oscillation circuit can be substantially ignored in the resonance circuit.
Inventors
- 👤 Hiroyuki Yamasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:26
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/952; H03K17/9537; H03K17/9505
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A proximity switch, comprising: a detection coil having a core, said core having a front and a back surface; a capacitor disposed on the back surface of said core and electrically connected to said detection coil to form a resonance circuit; an oscillation circuit is operative connection with said resonance circuit; an electrostatic shield surrounding said oscillation circuit; a long, narrow, insulating member; said resonance circuit and said oscillator circuit with said shield being arranged in a narrow, linear relationship and being disposed inside of said insulating member; a narrow housing, said resonance circuit, oscillation circuit, electrostatic shield, and insulating member comprising a single assembly disposed within said housing.
Claim 2
Dependent Claim
109 words
A proximity switch, comprising: a detection coil having a core, said core having a front and a back surface; a capacitor disposed on the back surface of said core and electrically connected to said detection coil to form a resonance circuit; an oscillation circuit is operative connection with said resonance circuit; an electrostatic shield surrounding said oscillation circuit; a long, narrow, insulating member; said resonance circuit and said oscillator circuit with said shield being arranged in a narrow, linear relationship and being disposed inside of said insulating member; a narrow housing, said resonance circuit, oscillation circuit, electrostatic shield, and insulating member comprising a single assembly disposed within said housing.
Claim 3
Dependent Claim
23 words
The proximity switch of claim 1, wherein said capacitor is of a chip type and fixed to said back surface of the core.
Claim 4
Dependent Claim
40 words
The proximity switch of claim 2, further comprising a connection wire and wherein an electrode of said capacitor is used as a terminal via which said connection wire provides an electric connection between said resonance circuit and said oscillation circuit.
Claim 5
Dependent Claim
16 words
The proximity switch of claim 1, wherein said electrostatic shield is formed on a flexible sheet.
Claim 6
Dependent Claim
23 words
The proximity switch of claim 4, wherein said flexible sheet provides the operative electrical connection between said resonnance circuit and said oscillation circuit.
Claim 7
Dependent Claim
18 words
The proximity switch of claim 5, wherein said capacitor is connected to said coil through said flexible sheet.
Claim 8
Dependent Claim
40 words
The proximity switch of claim 4, wherein said flexible sheet includes a conductive lattice pattern having of plurality of slits which are long along a wrapping axis of the sheet and short in a direction perpendicular to the wrapping axis.
Claim 9
Dependent Claim
28 words
The proximity switch of claim 1 wherein an outer surface of said core is covered with a vapor-deposited metal film so as to electrically shield said detection coil.
Claim 10
Dependent Claim
17 words
The proximity switch of claim 1, including a circuit for processing output signals from said oscillation circuit.
References Cited (Backward Citations)
US3801799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |