US5867111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Touch control system
Assignee: Donnelly Technology Inc
•
Filing: 1996-11-01
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Granted: 1999-02-02
•
Expires: 2016-11-01
Abstract
Abstract A touch control system that is responsive to a user input selection includes an electrically non-conducting substrate, such as glass ceramic, and at least one capacitive-responsive touch pad on the substrate. A source signal having a primary frequency that is greater than 150 kHz, and preferably in the range of between 150 kHz and 500 kHz, is applied to one portion of the touch pad. The touch pad couples the electrical signal to another portion of the touch pad in order to develop a detection signal, which is decoded in order to determine the presence of the capacitance of a user. The decoder preferably includes a peak detector composed of a low gain circuit in order to avoid distortion of the detection signal. Greatly improved performance in the presence of liquids, such as water, on the touch pad is provided. This is especially useful when the touch pad is applied to a horizontal surface, such as a cook top, upon which liquid spills may occur. A display is juxtaposed with the glass ceramic substrate and an optical correction material is provided between the display and the underlying modulated surface that imparts mechanical strength to the substrate. The optical correction material corrects optical distortion of the visual indications of the display caused by the modulated surface.
Inventors
- 👤 David W. Caldwell
- 👤 Nicholas W. Medendorp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:58
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/962; H03K17/9622; F; F24; F24C; F24C7/00; F24C7/08; F24C7/082; F24C7/083
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
92 words
A moisture immune touch control circuit for use with a substrate comprising: a touch responsive circuit including at least one touch pad which produces a detection signal in the presence of capacitance of a user at said touch pad, wherein said detection signal is substantially immune to the presence of moisture; and a decoding circuit that responds to said detection signal in order to determine the presence of said capacitance of a user, said decoding circuit including a successive approximation register circuit in order to determine an amplitude of said detection signal.
Claim 2
Dependent Claim
92 words
A moisture immune touch control circuit for use with a substrate comprising: a touch responsive circuit including at least one touch pad which produces a detection signal in the presence of capacitance of a user at said touch pad, wherein said detection signal is substantially immune to the presence of moisture; and a decoding circuit that responds to said detection signal in order to determine the presence of said capacitance of a user, said decoding circuit including a successive approximation register circuit in order to determine an amplitude of said detection signal.
Claim 3
Dependent Claim
38 words
The touch control circuit in claim 1 wherein said successive approximation register circuit includes a resistance network driven by a microcomputer to produce an approximation signal and a comparator to compare said detection signal with said approximation signal.
Claim 4
Dependent Claim
22 words
The touch control circuit in claim 2 wherein said successive approximation register circuit includes a scaling circuit to scale said approximation signal.
Claim 5
Dependent Claim
24 words
The touch control circuit in claim 1 including a carrier supporting and electrically interconnecting components defining said touch responsive circuit and said decoding circuit.
Claim 6
Dependent Claim
21 words
The touch control circuit in claim 1 wherein said decoding circuit has an input impedance of less than approximately 10 kohms.
Claim 7
Dependent Claim
21 words
The touch control circuit in claim 4 including an indicator mounted to said carrier for displaying outputs of said decoding circuit.
Claim 8
Dependent Claim
14 words
The touch control circuit in claim 6 wherein said carrier is a flexible carrier.
Claim 9
Dependent Claim
14 words
The touch control circuit in claim 4 wherein said carrier is a flexible carrier.
Claim 10
Dependent Claim
21 words
The touch responsive circuit in claim 1 wherein said at least one touch pad includes a pair of electrically conductive elements.
Claim 11
Dependent Claim
38 words
The touch responsive circuit in claim 9 including a signal generator for applying a signal to one of said elements, the capacitance of a user coupling said signal to the other of said elements as said detection signal.
Claim 12
Dependent Claim
18 words
The touch responsive circuit in claim 7 including an adhesive for affixing said flexible carrier to a substrate.
Claim 13
Dependent Claim
141 words
A moisture immune touch control circuit which is static electricity resistant for use with a substrate comprising: a touch responsive circuit including at least one touch pad which produces a detection signal in the presence of capacitance of a user at said touch pad, wherein said detection signal is substantially immune to the presence of moisture; and a decoding circuit the responds to said detection signal in order to determine the presence of said capacitance of a user, said decoding circuit comprising a low gain detector circuit, an amplifier and an impedance element, said detector circuit having an input coupled with said touch responsive circuit to receive said detection signal and an output coupled with said amplifier, said impedance element connected between said input and a ground providing an input impedance for said decoding circuit of less than approximately 10 kohms.
Claim 14
Dependent Claim
141 words
A moisture immune touch control circuit which is static electricity resistant for use with a substrate comprising: a touch responsive circuit including at least one touch pad which produces a detection signal in the presence of capacitance of a user at said touch pad, wherein said detection signal is substantially immune to the presence of moisture; and a decoding circuit the responds to said detection signal in order to determine the presence of said capacitance of a user, said decoding circuit comprising a low gain detector circuit, an amplifier and an impedance element, said detector circuit having an input coupled with said touch responsive circuit to receive said detection signal and an output coupled with said amplifier, said impedance element connected between said input and a ground providing an input impedance for said decoding circuit of less than approximately 10 kohms.
Claim 15
Dependent Claim
24 words
The touch control circuit in claim 12 including a carrier supporting and electrically interconnecting components defining said touch responsive circuit and said decoding circuit.
Claim 16
Dependent Claim
21 words
The touch control circuit in claim 13 including an indicator mounted to said carrier for displaying outputs of said decoding circuit.
Claim 17
Dependent Claim
14 words
The touch control circuit in claim 14 wherein said carrier is a flexible carrier.
Claim 18
Dependent Claim
14 words
The touch control circuit in claim 13 wherein said carrier is a flexible carrier.
Claim 19
Dependent Claim
18 words
The touch control circuit in claim 16 including an adhesive for affixing said flexible carrier to a substrate.
Claim 20
Dependent Claim
16 words
The touch control circuit in claim 12 wherein said detector circuit is a peak detector circuit.
Claim 21
Dependent Claim
17 words
The touch control circuit in claim 18 wherein said peak detector circuit has a substantially unity gain.
Claim 22
Dependent Claim
16 words
The touch control circuit in claim 12 wherein said detector circuit has a substantially unity gain.
Claim 23
Dependent Claim
21 words
The touch control circuit in claim 12 wherein said impedance element has an impedance value of less than approximately 10 kohms.
Claim 24
Dependent Claim
136 words
A touch control circuit for use with a substrate comprising: a touch responsive circuit including at least one touch pad which produces a detection signal in the presence of capacitance of a user at said touch pad; and a microcomputer having an output which operates a resistance network in order to produce an analog signal, a comparator which compares said analog signal with said detection signal and produces a digital signal which is supplied as an input to said microcomputer, said digital signal having a state which is a function of the relative amplitudes of said analog signal and said detection signal, wherein said microcomputer is programmed to adjust said output while monitoring said input in a manner which determines whether said detection signal represents the presence of capacitance of a user at said touch pad.
Claim 25
Dependent Claim
136 words
A touch control circuit for use with a substrate comprising: a touch responsive circuit including at least one touch pad which produces a detection signal in the presence of capacitance of a user at said touch pad; and a microcomputer having an output which operates a resistance network in order to produce an analog signal, a comparator which compares said analog signal with said detection signal and produces a digital signal which is supplied as an input to said microcomputer, said digital signal having a state which is a function of the relative amplitudes of said analog signal and said detection signal, wherein said microcomputer is programmed to adjust said output while monitoring said input in a manner which determines whether said detection signal represents the presence of capacitance of a user at said touch pad.
Claim 26
Dependent Claim
21 words
The touch control circuit in claim 22 wherein said decoding circuit has an input impedance of less than approximately 10 kohms.
Claim 27
Dependent Claim
20 words
The touch control circuit in claim 22 including a carrier supporting and electrically interconnecting components defining said touch control circuit.
Claim 28
Dependent Claim
21 words
The touch control circuit in claim 24 including an indicator mounted to said carrier for displaying outputs of said decoding circuit.
Claim 29
Dependent Claim
14 words
The touch control circuit in claim 25 wherein said carrier is a flexible carrier.
Claim 30
Dependent Claim
14 words
The touch control circuit in claim 24 wherein said carrier is a flexible carrier.
Claim 31
Dependent Claim
18 words
The touch control circuit in claim 27 including an adhesive for affixing said flexible carrier to a substrate.
Claim 32
Dependent Claim
21 words
The touch control circuit in claim 22 wherein said at least one touch pad includes a pair of electrically conductive elements.
Claim 33
Dependent Claim
38 words
The touch control circuit in claim 29 including a signal generator for applying a signal to one of said elements, the capacitance of a user coupling said signal to the other of said elements as said detection signal.
References Cited (Backward Citations)
US3846791A
Cited
US3974472A
Cited
US3971013A
Cited
US4056699A
Cited
US4159473A
Cited
US4090092A
Cited
US4119864A
Cited
US4123631A
Cited
US4136291A
Cited
US4161766A
Cited
US4145748A
Cited
US4304976A
Cited
US4263659A
Cited
US4175239A
Cited
US4203230A
Cited
US4237421A
Cited
US4211915A
Cited
US4308443A
Cited
US4246533A
Cited
US4291303A
Cited
US4380040A
Cited
US4290052A
Cited
US4413252A
Cited
US4405918A
Cited
US4446350A
Cited
US4388612A
Cited
US4323829A
Cited
US4712163A
Cited
US4495485A
Cited
US4405917A
Cited
US4394643A
Cited
US4400758A
Cited
US4550310A
Cited
US4529968A
Cited
US4614937A
Cited
US4567470A
Cited
US4439647A
Cited
US4561002A
Cited
US4736190A
Cited
US4665324A
Cited
US4527049A
Cited
US4924222A
Cited
US4743895A
Cited
US4954823A
Cited
US4914553A
Cited
US4709228A
Cited
US4651133A
Cited
US4740781A
Cited
US4688018A
Cited
US4731694A
Cited
US4794233A
Cited
US4777470A
Cited
US4983812A
Cited
US4901074A
Cited
US4855550A
Cited
US4920343A
Cited
US4894493A
Cited
US5012124A
Cited
US5155338A
Cited
US5153572A
Cited
US5157273A
Cited
US5183996A
Cited
US5189417A
Cited
US5239152A
Cited
US5270710A
Cited
US5049882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-01 | 2002-08-03 | 2003-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-01 | 2006-08-03 | 2007-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-01 | 2010-08-03 | 2011-02-02 | $7700.00 | Window Closed / Lapsed |