Patent EP0795835A1 successfully refreshed from Google Patents.
Patent US3764819A successfully refreshed from Google Patents.
US3764819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic switch actuated by proximity of the human body
Assignee: Individual
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Filing: 1972-03-15
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Granted: 1973-10-09
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Expires: 1992-03-15
Abstract
Abstract An improved contact-less electronic switch, adapted to be actuated by the approach of a human hand, with a capacitive probe insulated against the chassis and installed in the zone of approach, and connected to a capacitance detecting circuit which delivers a switching signal when the capacitance is increased by the approach of a hand, wherein the improvement comprises that the switch remains unaffected by the approach of all other substances, such as metals or insulating materials.
Inventors
- 👤 H Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:50
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
226 words
In an electronic switching arrangement actuated in a contactless manner by the approach of a portion of a human body, having a capacitive probe which is insulated from a support chassis, and connected to a capacitance measuring circuit which delivers a signal when a certain increase of the capacitance is caused by a predetermined approach of the portion of the human body into the electric field of the capacitive probe, the improvement which comprises an inductive probe disposed in the proximity of said capacitive probe, means whereby said inductive probe forms a portion of an oscillator circuit and having a magnetic field, the magnetic field of said inductive probe permeated the electric field of said capacitive probe, said inductive probe being connected to an inductive measuring circuit, said inductive measuring circuit being adjusted to deliver a switching signal indicative of the presence of a metal object at a predetermined distance from said support chasses, and chassis, capacitance measuring circuit being adjusted to deliver a switching signal only when the metal object is closer to said support chassis than the predetermined distance, means connected to receive switching signals from said inductive and capacitance measuring circuits and delivering an output signal only if the said capacitance measuring circuit supplies a switching signal and the measuring circuit associated with the inductive probe does not supply such a switching signal.
Claim 2
Dependent Claim
226 words
In an electronic switching arrangement actuated in a contactless manner by the approach of a portion of a human body, having a capacitive probe which is insulated from a support chassis, and connected to a capacitance measuring circuit which delivers a signal when a certain increase of the capacitance is caused by a predetermined approach of the portion of the human body into the electric field of the capacitive probe, the improvement which comprises an inductive probe disposed in the proximity of said capacitive probe, means whereby said inductive probe forms a portion of an oscillator circuit and having a magnetic field, the magnetic field of said inductive probe permeated the electric field of said capacitive probe, said inductive probe being connected to an inductive measuring circuit, said inductive measuring circuit being adjusted to deliver a switching signal indicative of the presence of a metal object at a predetermined distance from said support chasses, and chassis, capacitance measuring circuit being adjusted to deliver a switching signal only when the metal object is closer to said support chassis than the predetermined distance, means connected to receive switching signals from said inductive and capacitance measuring circuits and delivering an output signal only if the said capacitance measuring circuit supplies a switching signal and the measuring circuit associated with the inductive probe does not supply such a switching signal.
Claim 3
Dependent Claim
43 words
An arrangement as defined in claim 1, wherein are provided to adjust the sensitivity of the said capacitance measuring circuit to deliver a signal on the approach of an electrically conducting body, but not by the approach of a body of insulating material.
Claim 4
Dependent Claim
30 words
An arrangement as defined in claim 1, wherein said capacitive probe is mounted on said support chassis and said chassis is grounded and forms the counter-electrode of said capacitive probe.
Claim 5
Dependent Claim
51 words
An arrangement as defined in claim 1, wherein said inductive probe consists of a coil mounted on the legs of a U-shaped high frequency iron core and said capacitive probe consists of a metal plate disposed to lie between the two legs of said iron core but in spaced relationship thereto.
Claim 6
Dependent Claim
43 words
An arrangement as defined in claim 1, wherein said capacitive proBe and said inductive probe are supplied by the same oscillator and means whereby the damping of the oscillator is used as a measure of the degree of approach of a metal part.
Claim 7
Dependent Claim
22 words
An arrangement as defined in claim 1, wherein means are provided whereby the initial capacitance of the said capacitive probe is neutralized.
Claim 8
Dependent Claim
143 words
In an electronic switching arrangement comprising a switch actuated in a contact-less manner by the approach of a portion of a human body, comprising a coil divided into two partial windings, means including one of said windings connected to a capacitor to form an oscillator circuit of an oscillator, the other of said windings being connected to a capacitive probe and applying an electrical potential thereto; said capacitive probe being connected to a capacitance voltage converter circuit; said converter circuit being connected to a trigger; said trigger having a response threshold which is above the level of the signal supplied by said converter circuit in the absence of an object in a zone proximate to the switch and means whereby said response threshold of said trigger is exceeded when a portion of a human body is in the zone proximate to the switch.
Claim 9
Dependent Claim
143 words
In an electronic switching arrangement comprising a switch actuated in a contact-less manner by the approach of a portion of a human body, comprising a coil divided into two partial windings, means including one of said windings connected to a capacitor to form an oscillator circuit of an oscillator, the other of said windings being connected to a capacitive probe and applying an electrical potential thereto; said capacitive probe being connected to a capacitance voltage converter circuit; said converter circuit being connected to a trigger; said trigger having a response threshold which is above the level of the signal supplied by said converter circuit in the absence of an object in a zone proximate to the switch and means whereby said response threshold of said trigger is exceeded when a portion of a human body is in the zone proximate to the switch.
Claim 10
Dependent Claim
16 words
An arrangement as defined in claim 7, wherein said capacitance converter circuit comprises a diode pump.
Claim 11
Dependent Claim
20 words
An arrangement as defined in claim 7, wherein means are provided whereby the response threshold of said trigger is adjustable.
Claim 12
Dependent Claim
21 words
An arrangement as defined in claim 7, wherein means are provided whereby the regenerative feedback factor of said oscillator is adjustable.
Claim 13
Dependent Claim
170 words
In a electronic switching arrangement including a switch actuated in a contact-less manner by the approach of a portion of a human body comprising a high frequency iron pot core, a coil disposed in said core, said coil being tapped to provide two partial windings, one of said partial windings being larger than the other of said partial windings, said one of said partial windings being arranged in space non-symmetrically with respect to said other of said partial windings; means including said coil connected to a capacitor to form an oscillator circuit of an oscillator; said coil being connected to a capacitance converter circuit; said converter circuit being connected to a trigger; said trigger having a response threshold which is above the level of the signal supplied by said converter circuit in the absence of an object in a zone proximate to the switch and means whereby said response threshold of said trigger is exceeded when a portion of a human body is in the zone proximate to the switch.
Claim 14
Dependent Claim
170 words
In a electronic switching arrangement including a switch actuated in a contact-less manner by the approach of a portion of a human body comprising a high frequency iron pot core, a coil disposed in said core, said coil being tapped to provide two partial windings, one of said partial windings being larger than the other of said partial windings, said one of said partial windings being arranged in space non-symmetrically with respect to said other of said partial windings; means including said coil connected to a capacitor to form an oscillator circuit of an oscillator; said coil being connected to a capacitance converter circuit; said converter circuit being connected to a trigger; said trigger having a response threshold which is above the level of the signal supplied by said converter circuit in the absence of an object in a zone proximate to the switch and means whereby said response threshold of said trigger is exceeded when a portion of a human body is in the zone proximate to the switch.
Claim 15
Dependent Claim
24 words
An arrangement as defined in claim 11, wherein said other of said partial windings is disposed outside of said one of said partial windings.
Claim 16
Dependent Claim
23 words
An arrangement as defined in claim 11, wherein said other of said partial windings is disposed inside said one of said partial windings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |