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WO2003094352A1 - Interrupteur tactile indirect pour appareil electrique - Google Patents

Interrupteur tactile indirect pour appareil electrique Download PDF

Info

Publication number
WO2003094352A1
WO2003094352A1 PCT/KR2002/001978 KR0201978W WO03094352A1 WO 2003094352 A1 WO2003094352 A1 WO 2003094352A1 KR 0201978 W KR0201978 W KR 0201978W WO 03094352 A1 WO03094352 A1 WO 03094352A1
Authority
WO
WIPO (PCT)
Prior art keywords
capacitance
signal
change
unit
wall switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2002/001978
Other languages
English (en)
Inventor
Soon-Hyeong Kwon
Woon-Jin Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ESSDESIGN CORP Ltd
Original Assignee
ESSDESIGN CORP Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020020024102A external-priority patent/KR20020071485A/ko
Priority claimed from KR1020020046023A external-priority patent/KR20020077836A/ko
Application filed by ESSDESIGN CORP Ltd filed Critical ESSDESIGN CORP Ltd
Priority to AU2002348585A priority Critical patent/AU2002348585A1/en
Publication of WO2003094352A1 publication Critical patent/WO2003094352A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector

Definitions

  • the present invention relates to a indirect touch switch for electric apparatus, and more particularly to an electric apparatus equipped with the indirect touch switch and/or a wall switch which senses the change of capacitance due to the touch of human fingers.
  • the switches become an important factor in the design of product because the home appliances affects the interior design as well as the use.
  • the switches for volume control, channel select, and chromaticity control are arranged in the rear or in the invisible location of the appliances.
  • the electronic switches of the appliances are arranged in such a way that they are invisible or not noticeable.
  • FIGS.1A and IB are schematic diagrams for indirect touch switch according to the prior art.
  • the prior art illustrated in FIG.1A reveals an indirect touch switch having a groove in the external frame 2' of the appliance and
  • I D metal region 4' protruded in the groove.
  • an insulating film 6 is formed in the upper part of the metal region 4 ' . If the fingers 1 of human body get in touch with a certain region of the insulating film 6, an electronic
  • the prior art employs the acrylic resin of which the thickness should be kept below 1mm in order to increase the sensitivity. Consequently, the prior art depicted in FIG 1A has a shortcoming in that the strength and durability of the insulating film 6 are poor .
  • the prior art depicted in FIG. IB, has a protruded metal part ' for its contact to the groove formed in the frame 2' .
  • the protruded metal part is in contact with the fingers, the change of the capacitance is detected.
  • the present invention discloses a detector for detecting the touch or the approach of the human body at the backside of the front panel of the appliance, and an oscillator producing the oscillation frequency varying with the change of the capacitance detected at the detector.
  • the present invention further comprises a rectifier converting the output of the oscillator to a dc voltage, and a differential amplifier for the amplification of the dc voltage at the output of the rectifier.
  • the present invention further comprises a signal generator for comparing the output of the differential amplifier with the reference voltage .
  • the present invention also provides a wall switch having a control board comprising a dielectric plate for the contact or the approach of a human body, a metal plate arranged with a predetermined spacing in parallel to the dielectric plate, and an on/off control circuit in electrical connection to the metal plate.
  • the control board in accordance with the present invention comprises a sensor detecting the change of static capacitance, switching circuit for on/off control in connection with the power line to the wall switch, switching control unit controlling the operation of the switching circuit under the control of the signal from the sensor, and a rectifier for supplying a dc power to the sensor and the switching control unit .
  • FIGS .1A and IB are schematic diagrams of an appliance equipped with the indirect touch switches of the prior art.
  • FIG.2 is a schematic diagram of an appliance equipped with an indirect touch switch in accordance with a first embodiment of the present invention.
  • FIG.3 is a schematic diagram of an appliance equipped with an indirect touch switch in accordance with a second embodiment of the present invention.
  • FIG. is a schematic diagram illustrating a preferred embodiment of an indirect touch switch in accordance with the present invention.
  • FIGS.5A through to 5D are schematic diagrams illustrating preferred embodiments of electrical appliances equipped with indirect touch switches such that those switches are invisible from the outside.
  • FIG.6 is a schematic block diagram illustrating the construction of the sensor circuit in accordance with the present invention.
  • FIG.7 is a schematic diagram illustrating the detecting unit for detecting the change of the static capacitance.
  • FIG.8A is a schematic diagram illustrating the waveform of the output signal, transformed into a square wave, and a sensing signal applied to the waveform shaping circuit in FIG.7
  • FIG.8B is a schematic diagram illustrating the waveform of the saw-tooth reference signal (ref_in) and a square-wave reference signal (f_ref_in) .
  • FIG.9 is a schematic diagram illustrating the block of the determining unit in accordance with a preferred embodiment of the present invention.
  • FIG.10 is a schematic diagram illustrating a wall switch as a third embodiment of the present invention.
  • FIG.11 is a schematic diagram illustrating a wall switch employing the change of the capacitance in accordance with the present invention.
  • FIG.12 is a schematic circuit diagram illustrating the sensor unit for detecting the change of the static capacitance.
  • FIG.13 is a schematic diagram illustrating the construction of a switch control unit in accordance with a third embodiment of the present invention.
  • FIG.14 is schematic circuit diagram illustrating the switching unit and the rectifier in accordance with a third embodiment of the present invention.
  • FIG.15 is a schematic diagram illustrating the construction of wall switch in accordance with a fourth embodiment of the resent invention.
  • FIG.2 is a schematic diagram illustrating the concept of an electric appliance equipped with an indirect touch switch in accordance with a first embodiment of the present invention.
  • a capacitance- sensing circuit 5 detects the indirect touch of a human body.
  • the indirect touch switch in accordance with a first embodiment of the present invention, as depicted in FIG.2, has a metal unit 4 in contact with the printed circuit board (PCB; 3) and make electrical connections between the metal unit 4 and the sensing circuit 5.
  • PCB printed circuit board
  • the thickness of the external frame 2 can be approximately 3mm and the acrylic resin or plastic and glass can be employed .
  • FIG.3 illustrates another embodiment of an indirect touch switch comprising and external frame 2 with a different material for the cover frame 2 1 ' on the metal sensing circuit 4.
  • the thickness of the cover frame 2'' could be above than 3mm.
  • FIG.4 is a schematic diagram illustrating an indirect touch switch having a sensing circuit in accordance with the present invention .
  • the static capacitance detected at the touch detecting unit 10 is changed if the fingers get close to or in touch with the switch.
  • the oscillating frequency of the oscillator 20 is changing and the oscillating signal of the oscillator 20 is rectified to a dc voltage at the rectifying unit 30, and followed by a step of differential amplification with reference to a predefined voltage at a differential amplifier 40.
  • the output voltage of the differential amplifier 40 is compared with the predefined reference voltage at a comparator 50 in order to generate a switching signal when the fingers get close to or in contact with the switch .
  • an indirect touch switch in accordance with the invention comprises a touch detector 10, detecting the change of capacitance when the fingers get close to or in contact, an oscillator 20 generating a signal whose oscillation frequency is varying with the change of- the capacitance, and a rectifying circuit 30 converting the output of the oscillator 20 to a de voltage.
  • the present invention further comprises a comparator 50 generating a switching signal by comparing the dc voltage of the differential amplifier 40 with the predetermined reference voltage .
  • the touch sensing circuit depicted in
  • FIG.4 does not necessarily comprise an oscillator 20, rectifying circuit 30 and a differential amplifier 40.
  • FIG.5A is a schematic diagram illustrating an embodiment wherein an indirect touch switch is implemented in the interior of the flat-panel television monitor.
  • the present invention comprises an indirect touch switch 96, an on/off detecting unit for power control 60, a detecting unit for volume up control 70, a detecting unit for volume down control go, and a touch detector for channel select 90, 95.
  • An insulating film 97 is put on the touch detector 60, 70, 80, 90, 95, while the cover 97 is aligned with the external panel of the flat-panel television monitor.
  • the touch detector detects the change of capacitance.
  • the electric appliance equipped with the indirect touch switch in accordance with the present invention can be applied to other various home appliances as well as the television monitors.
  • FIGS.5B through 5D are schematic diagrams illustrating preferred embodiments of implementing indirect touch switches invisibly inside the electric appliances.
  • a various switches are implemented inside the panel of electrical appliances including a microwave oven , a refrigerator, and a television set.
  • FIG.6 is a schematic diagram illustrating a sensing circuit in accordance with a preferred embodiment of the present invention .
  • the present invention comprises a capacitance detector 100 producing a square-wave signal of which the frequency is varying with the capacitance, a unit 200 detecting an indirect and/or direct touch of a human body by comparing the square- wave signal with the reference signal, and a delay circuit 300 which delays the output of the unit 200 for the stable circuit operation.
  • the capacitance detector 100 comprises a reference current generator 110 for supplying a static current, a saw-tooth wave generator 120 generating a saw-tooth alternating signal in accordance with the reference signal (Cap_ref ) and the sensed signal (Cap_sen) at the input, and a waveform shaping unit 130 for converting the saw-tooth signal to the square wave signal.
  • the waveform shaping unit 130 includes the oscillating unit 140 at the output.
  • the oscillating unit 140 helps to provide a stable square wave signal by supplying a feed-back the output to the saw-tooth generator 120.
  • the current generator 110 comprises a current mirror sense amplifier in order to generate a constant current .
  • the saw-tooth waveform generator 120 employs the charging and discharging of the capacitor wherein the frequency of the saw-tooth waveform is varying according to the capacitance of the sensed signal (Cap_sen) and the reference signal (Cap_ref ) .
  • the condition for the frequency conversion can be altered in accordance with the internal construction of the oscillation unit 140.
  • a reset signal (not shown in the FIGURE) can be utilized in order to initialize the point where the reference signal (Cap_ref ) and the sensed signal (Cap_sen) are compared .
  • the waveform shaping unit 130 converts the saw-tooth wave to a square wave, producing a high-level voltage when the voltage of the sawtooth wave is above the reference high level (VH) while producing a low-level voltage when vice versa.
  • VH reference high level
  • a Schmitt triggering circuit can be employed.
  • An oscillating unit 140 is connected to a multiple of inverters in series, and comprises a ring oscillator which forms a closed loop by connecting the output of the last stage to the input of the first stage.
  • the output of the odd number stage is fed back to the input of the saw-tooth generator 120.
  • a decision unit 200 comprises a frequency converter 210 converting the out the output of the oscillator 140 to the low frequency, a comparator 220 deciding the human touch at the input by comparing the sensed signal with reference signal through a frequency converter 210, and a reset-signal generator 230 with utilizing the signals form the frequency converter 210.
  • the frequency converter 210 can be implemented with a multiple of flip-flops in order to increase the sensitivity by decreasing the frequency of the sensed signal and the reference signal.
  • the comparator 220 outputs the signal and the delay part 300 delays the output of the comparator 220 for the stable operator.
  • FIG.7 is a schematic diagram illustrating the block of the capacitance detector 100 in accordance with the present inven io .
  • the sensing circuit in accordance with the present invention comprises a reference current generator 110 for a constant current source, a saw-tooth wave generator 120 for generating the saw-tooth wave in accordance with the sensed signal (Cap_sen) and the reference signal (Cap_ref ) , and a waveform converter 130 for converting the saw- tooth waveform to a square wave .
  • a waveform converter 130 comprises a first waveform converter 131 for converting the saw-tooth sensed signal (Sen_in) to a square wave, a second waveform converter 132 for converting the saw-tooth waveform (ref_in) to a square wave .
  • the first and second waveform converters 131, 132 can be implemented with the Schmitt Trigger Circuit .
  • an oscillator 140 for oscillating an ac square wave comprises a first oscillating unit 141, and a second oscillating unit 142 for oscillating a reference signal.
  • the first and second oscillating units 141, 142 are fed back to the saw-tooth waveform generator 120.
  • a square wave second signal (f_sen_in) is generated through a first oscillating unit 141, while the square wave reference (r_ref_in) is generated at a second oscillating unit 142.
  • FIG.8A is a schematic diagram illustrating the sensed signal (sen_in) applied at a waveform converter 130 and the converted square wave (f__sen_in), while FIG.8B illustrates the waveforms of the saw-tooth reference signal (ref_in) and the square wave reference signal (f__ref_in) .
  • the output signal becomes low.
  • the time point of the conversion can be adjusted by changing the value of the internal device in Schmitt Trigger circuit .
  • FIG.9 is a schematic diagram illustrating the sensing circuit of the decision unit 200.
  • the decision unit 200 comprises a frequency converter 210 for converting the frequencies of the square-wave sensed signal (f_sen_in) and the square-wave reference signal (f_ref_in) down to the low frequency, a comparator 220 comparing the output signals of the frequency converter 210 and a generator for a reset signal 230.
  • a frequency converter 210 comprises a frequency converting unit for a sensed signal 212, a frequency converting unit 214 for a square wave reference signal (f_ref_in) .
  • the comparator 220 compares a low- frequency sensed signal (f_sen_out) of the frequency converting unit 212 for a sensed signal with a low- frequency reference signal (f_ref_out) of the frequency converting unit 214 for the reference signal, and if there is a difference in the frequency, the output signal (Out_sen) is generated because it is regarded as if the fingers are in contact with the switch.
  • a reset-signal generator 230 generates a reset signal (Reset) by employing a signal of the reference signal frequency converter 214, and provides the reset signal to the frequency converting unit 212 for a sensed signal, the frequency converting unit 214 for a reference signal, and the comparator 220.
  • a reset signal is also supplied to the saw-tooth waveform to synchronize for the stable operation of the circuit .
  • FIG.10 is a schematic diagram illustrating another embodiment of a wall switch
  • the wall switch has a dielectric plate 44 on the switch frame 410, and a metal plate 412 is arranged at uniform intervals underneath the dielectric plate 411.
  • the power switch will turned on and off depending on the change of capacitance due to the induced charge at the metal plate .
  • a plastic plate 413 supporting and housing the metal plate 412, a control board 415 controlling the on and off of the power, and plastic housing 414.
  • a signal input 416 of the control board 415 is electrically connected to the metal plate 412 through the plastic plate 413.
  • the dielectric plate 411 can be of any shape including planar, three-dimensional, and/or album-like, etc.
  • the dielectric plate can be of an arbitrary shape for the interior design.
  • the wall switch in accordance with the present invention can detect the change of capacitance by directly touching the switch or by proximity of a human body.
  • the dielectric plate 411 can be omitted, and the change of capacitance can be detected by directly making the metal plate 412 in contact with the human being .
  • the change in resistance can be utilized instead of capacitance .
  • a metal plate 412 is implemented on the input terminal of the PCB 415, where a plastic cover 411 is put as for a touch pad.
  • the value of the reference capacitance which is used for the comparison with the capacitance change when the human body is in proximity or in contact, can be set depending on the area or the dielectric constant of the touch pad. Therefore, the indirect touch wall switch 410 can be converted in to various forms .
  • the reference capacitance Q is set in such a way that there is no output if the human body is neither in proximity nor in contact .
  • the capacitance sensor 420 detects the capacitance change when the human body is in proximity (4 ⁇ 5 cm) or in contact .
  • the value of Q ⁇ can be set 15 pF .
  • FIG.11 is a schematic diagram illustrating a wall switch in accordance with a third embodiment of the invention.
  • the capacitance sensor 420 generates an oscillating signal as a capacitance for a reference, and detects the proximity or the contact of the human body by calculating the capacitance.
  • the capacitance sensing unit 420 comprises an oscillating circuit converting the sensed capacitance into a square wave, a decision unit for deciding whether the human body is in proximity/contact or not, and a delay circuit for prohibiting the malfunction.
  • a switch control unit 430 is a device wherein a signal for controlling the on/off of the switch supplying the power in a toggle manner from the capacitance sensing unit 420.
  • the switching unit 440 is a device wherein the power supply to the lightening 470 is controlled by turning on and off the power supply.
  • FIG.12 is a schematic diagram illustrating the circuit for a wall switch in accordance with a third embodiment of the present invention.
  • the capacitance sensing unit 420 senses the change in capacitance, either direct or indirect, and works as a switch especially when it is used as an indirect witch despite the fact that glass or a plastic layer is coated on the surface of the contact for protection.
  • the processing unit 502 consisting of the capacitance sensing unit 420 an oscillating circuit converting the capacitance into a square wave through an input terminal 411 of a sensing circuit, a decision unit for deciding the proximity and/or contact, and a delay circuit for avoiding the malfunction.
  • the processing unit 502 is a circuit generating an oscillation signal from the capacitance value of a certain reference value and detecting the proximity or the contact of a human body by comparing the oscillation frequency of the detected capacitance .
  • Q 501 is a reference capacitance for detecting the proximity and contact of a human body, which is determined by the contact area and the texture of the contact layer.
  • a relatively large value of capacitance can be taken because the area of the wall switch is large.
  • the output of Sense 1 can be set as zero while the output of Sense 1 is unity when in contact .
  • FIG.13 is a schematic diagram illustrating the circuit of a switch control unit in accordance with a third embodiment of the present invention.
  • the switch control unit is a unit generating the on/off control signal for toggling the light bulb, and output 1 and O in a repeated manner by connecting the input D and the output Q of the flip-flop 504.
  • FIG.14 is a schematic diagram illustrating a switching unit and a rectifying unit for a wall switch in accordance with a third embodiment of the present invention.
  • AC signal is converted to a DC signal of 6.8V through BDl 510, R2 511, C2 512, DZ3 513, C3 514, and supplies power to the switch control unit 430 and switching unit 440.
  • control signal controls the on and off of switching control resister (SCR) S- L 517 through a photocoupler UI 515 and Ql 516.
  • SCR switching control resister
  • UI 515 and Ql 516 When Ql 516 is off, the voltage of gate (terminal 3) of XI 518 becomes on, and XI 418 is also turned on. Finally, the light bulb becomes on because power is supplied to node 402 through terminals 1, 2 of XO 119, node 403, and terminals 1, 2 of XI 518.
  • FIG.15 is a schematic diagram illustrating a wall switch employing the change of resistance employing the change of resistance in accordance with a fourth embodiment of the present invention.
  • the embodiment employs the change in resistance and also a change in voltage drop as a consequence which is amplified by an amplifier 600 and compared at a comparator 610 when a human body is in proximity or in contact .
  • the touch unit 411 denotes the resistance value in parallel due to the contact of a human body, and the change in voltage drop is amplified through an amplifier 600 and compared by a comparator 610. Additionally, the adjustment unit for reference 630 adjusts sensitivity .
  • the output of the reference adjustment unit 610 can be filtered 620 in order to compensate for the movement of the output during contact .
  • the indirect touch switch in accordance with the present invention makes it possible to design the interior beautiful by hiding the switch at the backside of the front panel of the appliances .

Landscapes

  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

L'invention concerne un interrupteur tactile indirect qui détecte le contact d'un doigt à partir d'un changement de capacité mesurée. Cet interrupteur peut être installé de manière à être invisible sur le panneau interne d'un appareil électrique ou d'un interrupteur mural, comme interrupteur marche/arrêt, bouton de réglage de volume, interrupteur de commande, etc..
PCT/KR2002/001978 2002-05-02 2002-10-23 Interrupteur tactile indirect pour appareil electrique Ceased WO2003094352A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002348585A AU2002348585A1 (en) 2002-05-02 2002-10-23 Indirect touch switch for electrical apparatus

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR1020020024102A KR20020071485A (ko) 2002-05-02 2002-05-02 인체 감지 벽면 스위치
KR2002/24102 2002-05-02
KR1020020046023A KR20020077836A (ko) 2002-08-05 2002-08-05 전기 기기용 간접 터치 스위치
KR2002/46023 2002-08-05
KR1020020063692A KR20020086405A (ko) 2002-08-05 2002-10-18 전기 기기용 간접 터치 스위치
KR2002/63692 2002-10-18

Publications (1)

Publication Number Publication Date
WO2003094352A1 true WO2003094352A1 (fr) 2003-11-13

Family

ID=29407538

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2002/001978 Ceased WO2003094352A1 (fr) 2002-05-02 2002-10-23 Interrupteur tactile indirect pour appareil electrique

Country Status (2)

Country Link
AU (1) AU2002348585A1 (fr)
WO (1) WO2003094352A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420245A (en) * 2004-11-12 2006-05-17 Samsung Electronics Co Ltd Telephone hook switch using non-contact capacitve sensor
DE102006029120A1 (de) * 2006-06-22 2007-12-27 Ifm Electronic Gmbh Schaltungsanordnung zur Erfassung der Kapazität bzw. einer Kapazitätsänderung eines kapazitiven Schaltungs- oder Bauelements
CN108287638A (zh) * 2018-04-10 2018-07-17 刘兵 触摸检测电路及其触摸检测方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210822A (en) * 1977-08-05 1980-07-01 Wern Lars A Touch control switch
JPS6316322A (ja) * 1986-07-09 1988-01-23 Fujitsu Ltd タツチ検出機能付き表示装置
JPS63214823A (ja) * 1987-03-04 1988-09-07 Nec Corp タツチパネル入力装置
JPH05250087A (ja) * 1992-03-04 1993-09-28 Matsushita Electric Ind Co Ltd タッチスイッチ装置
US5327164A (en) * 1992-03-17 1994-07-05 Sextant Avionique Method and apparatus for providing a touch screen
EP0680007A1 (fr) * 1994-04-28 1995-11-02 NCR International, Inc. Blindage pour un écran tactile du type capacitif
KR20000031593A (ko) * 1998-11-07 2000-06-05 구자홍 터치스위치및그의대전층제조방법
KR200198568Y1 (ko) * 2000-04-22 2000-10-02 하가전자주식회사 프리볼트 디지탈 벽 스위치기
KR20010026558A (ko) * 1999-09-07 2001-04-06 구자홍 터치 스위치

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210822A (en) * 1977-08-05 1980-07-01 Wern Lars A Touch control switch
JPS6316322A (ja) * 1986-07-09 1988-01-23 Fujitsu Ltd タツチ検出機能付き表示装置
JPS63214823A (ja) * 1987-03-04 1988-09-07 Nec Corp タツチパネル入力装置
JPH05250087A (ja) * 1992-03-04 1993-09-28 Matsushita Electric Ind Co Ltd タッチスイッチ装置
US5327164A (en) * 1992-03-17 1994-07-05 Sextant Avionique Method and apparatus for providing a touch screen
EP0680007A1 (fr) * 1994-04-28 1995-11-02 NCR International, Inc. Blindage pour un écran tactile du type capacitif
KR20000031593A (ko) * 1998-11-07 2000-06-05 구자홍 터치스위치및그의대전층제조방법
KR20010026558A (ko) * 1999-09-07 2001-04-06 구자홍 터치 스위치
KR200198568Y1 (ko) * 2000-04-22 2000-10-02 하가전자주식회사 프리볼트 디지탈 벽 스위치기

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420245A (en) * 2004-11-12 2006-05-17 Samsung Electronics Co Ltd Telephone hook switch using non-contact capacitve sensor
GB2420245B (en) * 2004-11-12 2007-02-14 Samsung Electronics Co Ltd Telephone hook switch using non-contact capacitive sensor and telephone using same
AU2005232266B2 (en) * 2004-11-12 2008-04-10 Samsung Electronics Co., Ltd. Telephone hook switch using non-contact capacitive sensor and telephone using the same
US7580509B2 (en) 2004-11-12 2009-08-25 Samsung Electronics Co., Ltd. Telephone hook switch using non-contact capacitive sensor and telephone using the same
DE102006029120A1 (de) * 2006-06-22 2007-12-27 Ifm Electronic Gmbh Schaltungsanordnung zur Erfassung der Kapazität bzw. einer Kapazitätsänderung eines kapazitiven Schaltungs- oder Bauelements
DE102006029120B4 (de) * 2006-06-22 2014-11-06 Ifm Electronic Gmbh Schaltungsanordnung zur Erfassung der Kapazität bzw. einer Kapazitätsänderung eines kapazitiven Schaltungs- oder Bauelements
CN108287638A (zh) * 2018-04-10 2018-07-17 刘兵 触摸检测电路及其触摸检测方法
CN108287638B (zh) * 2018-04-10 2023-08-11 刘兵 触摸检测电路及其触摸检测方法

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