Patent FR398234A successfully refreshed from Google Patents.
US3958239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive transistorized signaling device
Assignee: Individual
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Filing: 1973-09-27
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Granted: 1976-05-18
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Expires: 1993-09-27
Abstract
Abstract An electronic device incorporating a circuit for providing a signal with respect to an on or off mode dependent upon the degree of capacitance. The invention comprises a first and basic embodiment utilizing a signal source having a slope of a step function or specifically one having a fast rise time initiated for example by a clock element. The operative signal criteria demands that the length and slope thereof respectively have an effective amplitude and an effective frequency compatible with the circuit components. The signal source is fed to a transistor or suitable amplifier having its base connected to a capacitance sensing means. Resistors are provided for appropriate biasing, current limiting and drain functions as well as capacitors for capacitance balancing purposes. The capacitance sensing means can comprise a touch switch which when touched has its capacitance increased causing the device to function. The transistor or amplifier is connected to a load so that when a change of capacitance is sensed, the change will be registered. Other embodiments can incorporate differential amplification means and means to drive the active components with the voltage of the signal source or the clock voltage. Alternative embodiments of this invention incorporate capacitance sensing means in the form of transducers which can operate in a linear or a sequential mode. The transducers functionally incorporate a change of capacitance by means of moving mechanical elements so that when such change in capacitance is detected by the circuit it will provide an on or off sensing for the circuit or an analog of the change in capacitance. Thus, a reading of the extent of mechanical movement of a mechanically moving object can be transduced into an electrical function or output having substantial linearity. In summation, the circuit of this invention can be used for a transducer, or a solid state switch.
Inventors
- 👤 Robert E. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01K; G01K7/00; G01K7/34; G01L; G01L1/00; G01L1/14; G01L1/142; G01L1/144; G01L9/00; G01L9/0001; G01L9/0005; G01L9/12; G01L9/125; H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955; H03K17/96; H03K17/962; H03K17/965; H03K17/975; H03K17/98
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
126 words
A switch comprising: a capacitive registering element having a conductive surface for purposes of acting as a capacitive element in conjunction with a second body placed in proximity thereto: a means for generating a signal having sufficiently the slope of a step function to cause the switch to function as a slope differentiation detector with respect to the second body placed in proximity to said capacitive registering element; means for connecting said conductive surface of said capacitive registering element to said signal generation means so that a change in capacitance between said capacitive registering element and a second body will change the rise time of the slope; an amplifier connected to said conductive surface and said signal means; and, an electrical load connected to said amplifier.
Claim 2
Dependent Claim
126 words
A switch comprising: a capacitive registering element having a conductive surface for purposes of acting as a capacitive element in conjunction with a second body placed in proximity thereto: a means for generating a signal having sufficiently the slope of a step function to cause the switch to function as a slope differentiation detector with respect to the second body placed in proximity to said capacitive registering element; means for connecting said conductive surface of said capacitive registering element to said signal generation means so that a change in capacitance between said capacitive registering element and a second body will change the rise time of the slope; an amplifier connected to said conductive surface and said signal means; and, an electrical load connected to said amplifier.
Claim 3
Dependent Claim
37 words
The switch as claimed in claim 1 wherein: the amplifier is a transistor; and, the emitter of said transistor is connected to said signal generating means, and the collector of said transistor is connected to said load.
Claim 4
Dependent Claim
20 words
The switch as claimed in claim 2 further comprising: a capacitor connected across the base and emitter of said transistor
Claim 5
Dependent Claim
20 words
The switch as claimed in claim 2 further comprising: a resistor placed across the base and emitter of said transistor.
Claim 6
Dependent Claim
14 words
The switch as claimed in claim 1 wherein: said amplifier is a differential amplifier.
Claim 7
Dependent Claim
20 words
The switch as claimed in claim 1 wherein: said means for generating a signal provides the power to said amplifier.
Claim 8
Dependent Claim
49 words
The switch as claimed in claim 1 further comprising: the combination device of at least a second switch having the elements of the switch in claim 1 wherein said means for generating a signal is in singular form and utilized for both switches by being connected in parallel thereto.
Claim 9
Dependent Claim
44 words
The combination device as claimed in claim 7 wherein: said switches are connected to a keyboard formed with the capacitive coupling elements therein as its keys; and, a diode decode matrix is interposed between said capacitive coupling elements and the remainder of the switches.
Claim 10
Dependent Claim
103 words
A transduction device comprising: a capacitive registering element having a first conductor capable of being capacitively coupled to a second body wherein said first conductor is suitably exposed for increases in capacitance with respect to an external body; a differential amplifier connected to said first conductor of said capacitively coupled element; a signal production means producing a signal having a substantially rapid rise or fall time connected to said differential amplifier so that said differential amplifier can differentiate changes in slope caused by changes of capacitance with respect to said capacitance registering element; and, biasing means for appropriate operation of the differential amplifier.
Claim 11
Dependent Claim
103 words
A transduction device comprising: a capacitive registering element having a first conductor capable of being capacitively coupled to a second body wherein said first conductor is suitably exposed for increases in capacitance with respect to an external body; a differential amplifier connected to said first conductor of said capacitively coupled element; a signal production means producing a signal having a substantially rapid rise or fall time connected to said differential amplifier so that said differential amplifier can differentiate changes in slope caused by changes of capacitance with respect to said capacitance registering element; and, biasing means for appropriate operation of the differential amplifier.
Claim 12
Dependent Claim
24 words
The device as claimed in claim 9 further comprising: a capacitor connected to said differential amplifier to compensate for stray capacitances within the circuit.
Claim 13
Dependent Claim
26 words
The device as claimed in claim 9 further comprising: a signal production means having sufficient power to operate and power the elements of said differential amplifier.
Claim 14
Dependent Claim
28 words
The device as claimed in claim 11 further comprising: a capacitor connected to said signal production means for reducing transient spikes emanating from said signal producing power means.
Claim 15
Dependent Claim
20 words
A device as claimed in claim 9 wherein: a capacitor is provided for coupling any negative feedback of the amplifier.
Claim 16
Dependent Claim
75 words
A capacitive transduction device comprising: a capacitive coupler having a first conductive member adapted and placed for capacitive coupling with a body that can move with respect to said first conductive member; a signal source providing a signal having the slope of a step function; and, an amplifier connected for amplification of a signal developed in response to the change of the slope of the step function between said capacitive coupler and said signal source.
Claim 17
Dependent Claim
75 words
A capacitive transduction device comprising: a capacitive coupler having a first conductive member adapted and placed for capacitive coupling with a body that can move with respect to said first conductive member; a signal source providing a signal having the slope of a step function; and, an amplifier connected for amplification of a signal developed in response to the change of the slope of the step function between said capacitive coupler and said signal source.
Claim 18
Dependent Claim
73 words
A device as claimed in claim 14 wherein: a dielectric shield is internally positioned of said first member of a dielectric material; the body is positioned for movement within said dielectric member for purposes of providing changes in capacity; connection means for connecting said first member of said capacitive coupler to said amplifier; and, means for providing a lower potential for said body than that of the connection point of said first member.
Claim 19
Dependent Claim
17 words
A device as claimed in claim 14 wherein: said first member and said body are concentric cylinders.
Claim 20
Dependent Claim
60 words
The device as claimed in claim 14 further comprising: an insulated tank designed to receive said body; said first conductive member is placed on the outside of said insulated tank; a second conductive member on the outside of said tank to register changes in capacitance between said first and second conductive members when said body changes position in said tank.
Claim 21
Dependent Claim
38 words
The device as claimed in claim 14 further comprising: a non-insulated tank designed to receive said body; and, said first conductive member is placed in said tank and insulated from contact with said tank and any body therein.
Claim 22
Dependent Claim
64 words
A device as claimed in claim 14 wherein: a second conductor is placed in non-conductive relationship from said first conductive member; said body is a dielectric for movement between said first and second conductive members; means for connecting one of said conductors to said amplifier; and, means for coupling one of said conductors to a lower or ground potential with respect to said amplifier.
Claim 23
Dependent Claim
63 words
A device as claimed in claim 14 wherein: said conductive member is connected to said amplifier; a movable conductive block to change the space between said block and said first conductive plate to create changes of capacitance with respect thereto; and, a second conductor in adjacent relationship to said conductive block for providing a lower potential with respect to said first conductive member.
Claim 24
Dependent Claim
61 words
A device as claimed in claim 14 wherein: said body comprises a deformable member placed in spaced juxtaposition to said first conductive member; and, means for maintaining the potential of said deformable members below that of said amplifier so that as the deformable member moves, it changes the degree of capacity between said spaced first conductive member and said deformable member.
Claim 25
Dependent Claim
44 words
The device as claimed in claim 14 in combination with a cathode ray tube further comprising: a dielectric material for placement over said first conductive member in a manner whereby the display on the cathode ray tube can be seen through said dielectric material.
Claim 26
Dependent Claim
23 words
The device as claimed in claim 22 wherein: said dielectric material forms a panel substantially covering a portion of the cathode ray tube.
Claim 27
Dependent Claim
46 words
The device as claimed in claim 22 further comprising: an array of conductive members deposited on the side of said dielectric material facing said cathode ray tube to provide switch functions relating thereto; and, a decoding means for decoding the respective positions representing the respective switches.
Claim 28
Dependent Claim
49 words
The device as claimed in claim 24 further comprising: a computer interfaced with said cathode ray tube and said positions for recording the particular location which has been touched; and, a screen between the conductive member and said cathode ray tube for eliminating interference by said cathode ray tube.
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |