CN102509613B - Variable capacitor and position indicator using same - Google Patents
Variable capacitor and position indicator using same Download PDFInfo
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- CN102509613B CN102509613B CN201110300001.4A CN201110300001A CN102509613B CN 102509613 B CN102509613 B CN 102509613B CN 201110300001 A CN201110300001 A CN 201110300001A CN 102509613 B CN102509613 B CN 102509613B
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Abstract
The invention discloses a variable capacitor. The variable capacitor comprises a capacitor case, insulating media, a first pole plate, a second pole plate and an elastic component, wherein the insulating media are arranged in the case and are provided with two opposite sides; the first pole plate is vertically arranged on one side of the insulating media; the second pole plate is vertically arranged on the other side of the insulating media and is contacted with one side of the insulating media; the elastic component is connected with the second pole plate; when the second pole plate is not under pressure, the opposite area between the first pole plate and the second pole plate is zero, thus the capacitance of the variable capacitor is zero; and when the second pole plate is under pressure, the second pole plate moves upward and compresses the elastic component to change the opposite area between the first pole plate and the second pole plate, thus changing the capacitance of the variable capacitor. The invention also discloses a position indicator using the variable capacitor. By using the variable capacitor and the position indicator, the pressure can be accurately measured.
Description
Technical field
The present invention relates to a kind of variable condenser and utilize this variable condenser to measure the position indicator of input pressure.
Background technology
In recent years, coordinate input equipment is applied in PC as input equipment.Coordinate input equipment comprises a location detecting apparatus that is similar to the position indicator of pen and has inputting interface, in this equipment, input operation is exactly positioning action, hand-written feature input operation or Freehandhand-drawing input operation realize by use location indicator, and wherein device for pressure measurement is a part for position indicator.Device for pressure measurement generally comprises variable condenser and treatment circuit, and wherein variable condenser comprises electrode and another electrode with calibration function being affixed with insulator surface.Existingly disclosedly most of realize pen to press the variable condenser of measuring be all to adopt to the electrode of wherein making with the conductive rubber electrode of calibration function (with) to apply certain pressure, the right opposite that changes electrode pair is long-pending, thereby change capacitance, cause that circuit characteristic changes, and carry out thus gaging pressure size.
Fig. 1 is the structural drawing of the variable condenser of the pressure input device of the position indicator of prior art.As shown in Figure 1, the variable condenser of pressure input device of the prior art comprises two relative electrodes 3 ' and 4 ' of horizontally set, wherein, the electrode 3 ' on top is connected with processor (not shown) by conducting rod 2 ', and the electrode 4 ' of bottom is connected with processor by conducting rod 1 ', electrode 4 ' is deformable, is generally made up of conductive rubber.Between two electrodes 3 ' and 4 ', be provided with insulating medium 5 ', between electrode 4 ' and insulating medium 5 ', be also provided with becket 6 '.Fig. 2 is the structural representation of the pressure input device of the position indicator of prior art while being under pressure, and in Fig. 2, in the time that nib 8 ' is exerted pressure to electrode 4 ' by sheet metal 7 ', electrode 4 ' protrudes in becket 6 ', and contacts with insulating medium 5 '.The right opposite that the size of pressure can change electrode pair amasss, and causes the variation of capacitance, and processor changes and derives pressure size according to circuit characteristic.
But there are the following problems for above-mentioned prior art: first the size of pressure cannot directly obtain, and can only estimate roughly pressure size, this be because conductive rubber material deformation cannot be strict with pressure initiation corresponding relation; Secondly under pressure-less state, nib there will be the phenomenon of " leaking " or pen " not water outlet ".So-called " leaking ", refers to due to assembling or production technology difference, in the absence of pressure, conductive rubber electrode with pole plate between insulator contact, contact and formed variable capacitance charge-discharge circuit with conducting rod, thereby obtained force value; Pen " not water outlet " refers to if nib gives certain pressure, and float electrode is with insulator medium contact contacting with binding post, although there is right opposite to amass as S, charge-discharge circuit is not communicated with, and force value cannot be measured.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of variable condenser and measure the position indicator of input pressure with this variable condenser.
Variable condenser of the present invention, comprising: capacitor casing; Be arranged on the insulating medium in housing, it has two relative sides; The first pole plate, it is vertically arranged on a side of insulating medium; The second pole plate, it is vertically arranged on the opposite side of insulating medium, and contacts with the side of insulating medium; Elastomeric element, it is connected with the second pole plate; Wherein, in the time that the second pole plate is not under pressure, it is zero that the right opposite between the first pole plate and the second pole plate amasss, thereby the capacitance of variable condenser is zero; In the time that the second pole plate is under pressure, it moves upward and elasticity of compression parts, amass with the right opposite changing between the first pole plate and the second pole plate, thus the capacitance of change variable condenser.
In one embodiment, variable condenser also comprises the first insulation barrier that is arranged on the second pole plate top; The second insulation barrier, the below that it is arranged on the bottom of capacitor casing and is positioned at the second pole plate, extraneous applied pressure acts on this second insulation barrier.In this embodiment, elastomeric element is spring, and one end of this spring is fixed on the first insulation barrier, and the other end is fixed on the top inner surface of capacitor casing.
In one embodiment, variable condenser also comprises micromatic setting, for adjusting the position of the first pole plate.
In one embodiment, in the time that the second pole plate is not under pressure, elastomeric element in the raw.
The invention also discloses a kind of position indicator that uses above-mentioned variable condenser, comprising: for the shell gripping; For the variable condenser of gaging pressure, wherein, the first pole plate is drawn out to outside capacitor casing by the first conducting rod, and the second pole plate is drawn out to outside capacitor casing by the second conducting rod; Processor, this processor is connected with variable condenser with the second conducting rod by the first conducting rod, for measuring the time that discharges and recharges of variable condenser.
In one embodiment, this position indicator also comprises the nib that is arranged on outer casing end, and its one end is fixed on the second insulation barrier of variable condenser, and the other end extends to the outside of shell.
Variable condenser of the present invention and the position indicator that utilizes this variable condenser, adopt pressure to cause pole plate to slide, thereby the right opposite that between pole plate, relative position changes between pole plate amasss, spring deformation is directly proportional to right opposite is long-pending, thereby accurately obtains the size of pressure; In addition, adopt micromatic setting to regulate the position of pole plate, the right opposite changing between pressure-less state bottom crown amasss, and overcomes the problem of " leaking " and " not water outlet ".
Accompanying drawing explanation
Fig. 1 is the structural representation of the variable condenser of prior art;
Fig. 2 is the structural representation after the variable capacitance in Fig. 1 is exerted pressure;
Fig. 3 is the structural representation of the variable condenser of position indicator of the present invention;
Fig. 4 is the right view of the variable condenser of the position indicator of Fig. 3;
Fig. 5 is the structural representation after the variable condenser of Fig. 3 is exerted pressure;
Fig. 6 is the right view of the variable condenser in Fig. 5.
Description of reference numerals:
1 first conducting rod; 2 second conducting rods; 3 first electrodes; 4 second electrodes; 5 insulating mediums; 6 capacitor casing; 7 wires; 8 nibs; 9 micromatic settings; 10 springs; 11 first insulation barriers; 12 second insulation barriers.
Embodiment
Below in conjunction with accompanying drawing explanation the specific embodiment of the present invention.
Fig. 3 is the structural representation of the variable capacitance of pressure input device of the present invention.As shown in Figure 3, variable capacitance of the present invention comprises capacitor casing 6, and capacitor casing 6 inside hold each parts of variable capacitance.As shown in Figure 3, the bottom surface of capacitor casing 6 inside arranges the second insulation barrier 12, the second insulation barrier 12 is fixedly connected with nib 8 (can be also other parts that can apply power), and when nib is under pressure when mobile, the second insulation barrier 12 moves thereupon.
The top of the second insulation barrier 12 arranges insulating medium 5, and the left and right sides of insulating medium 5 are respectively arranged with the first pole plate 3 and the second pole plate 4.As shown in Figure 3, two pole plates are strip, and the first pole plate 3 is vertically arranged on a side of insulating medium 5, and in the time applying without external force, the top of the base of the first pole plate 3 and the second pole plate 4 just maintains an equal level.The second pole plate 4 is arranged on an other side of insulating medium 5 vertically, and contacts with the side of insulating medium 5.
Other one end that the top of the first pole plate 3 is connected with the first conducting rod 1, the first conducting rod 1 is exposed to outside capacitor casing 6, and the second pole plate 4 is drawn out to outside capacitor casing 6 by the second conducting rod 2, below introduces in detail concrete structure.
As shown in Figure 3, the top of the second pole plate 4 is provided with the first insulation barrier 11, below is provided with the second insulation barrier 12, due to the second pole plate and 4 and insulating medium 5 be set up in parallel, therefore insulating medium 5 is also between the first insulation barrier 11 and the second insulation barrier 12.On the upper surface of the first insulation barrier 11, be provided with elastomeric element (in the present embodiment, for spring 10), other one end of spring 10 is fixed on the top inner surface of the housing of variable condenser, and the second pole plate 4 can directly be connected with the second conducting rod 2 by wire.
In one embodiment, in order to reduce the connection wire in variable condenser, the one end that can make spring 10 be fixed on the top inner surface of variable condenser housing is connected with the second conducting rod 2, and the second pole plate 4 is connected with spring 10 by the wire 7 being arranged in the first insulation barrier 11, thereby the second pole plate 4 is connected with the second conducting rod 2 outside capacitor casing 6 by spring 10, form RC charge-discharge circuit.
In this embodiment, extraneous pressure is applied on the second insulation barrier 12 by nib 8 or miscellaneous part, and passes to successively the second pole plate 4, the first insulation barrier 11, spring 10.
In the time that the second insulation barrier 12 is not under pressure (pressure-less state), the right opposite of the first pole plate 3 and the second pole plate 4 is long-pending is just zero, and spring 10 preferably in the raw, now do not form capacitor; And be under pressure once the second insulation barrier 12, the second insulation barrier 12 just promotes the second pole plate 4, insulating medium 5 and the first insulation barrier 11 upward and moves upward, and makes the first pole plate 3 and the second pole plate 4 produce right opposite long-pending, thereby forms variable condenser, now, spring 10 is compressed.
Preferably, variable condenser of the present invention also comprises micromatic setting 9, micromatic setting 9 can be fine-tuning nut or other suitable parts, it is for changing the position of the first pole plate, thereby the right opposite that changes the first pole plate 3 and the second pole plate 4 is long-pending, by changing the long-pending capacitance size that changes of right opposite between pole plate, discharge and recharge the time thereby regulate under pressure-less state, overcome pen " leaking " and " not water outlet " problem.Particularly, when under pressure-less state, the first pole plate 3 is just adjusted to and do not had right opposite long-pending between the second pole plate 4, as shown in the right view of Fig. 4, in this case, the first pole plate 3 and the second pole plate 4 just join in vertical direction, both there is no intersection, do not had space yet.
Above-mentioned variable condenser can be used in the various devices that need gaging pressure, for example coordinate indicator, electronic scales etc.
The invention also discloses a kind of position indicator that utilizes above-mentioned variable condenser, it comprises the shell for gripping; For the variable condenser (above describe in detail, be not repeated herein) of gaging pressure size; Be used for the processor of the time that discharges and recharges of measuring variable condenser, this processor is connected with variable condenser with the second conducting rod 2 by the first conducting rod 1, measures the time that discharges and recharges of variable condenser; Be arranged on the nib 8 of outer casing end, its one end is fixed on the second insulation barrier 12 of variable condenser, and the other end extends to the outside of shell.
Wherein, in the time that nib 8 is not under pressure, it is zero that the right opposite between the first pole plate 3 and the second pole plate 4 amasss, and is zero thereby make the capacitance of variable condenser; In the time that nib 8 is under pressure, nib 8 promotes the second insulation barrier 12, the second pole plate 4 and the first insulation barrier 11, and Compress Spring 10 thus, the right opposite changing between the first pole plate 3 and the second pole plate 4 amasss, thereby the capacitance that changes variable condenser, now, variable condenser is as a capacitor charge and discharge loop, the time that discharges and recharges of detecting variable condenser by processor, again according to the method for measurement F value above, draws nib 8 force value that are subject to.Processor comprises comparer sum counter, and wherein, comparator terminal is connected with RC charge-discharge circuit, the other end is connected with reference voltage, in the time that the voltage on variable condenser rises or drop to reference voltage level size, comparer just generates and interrupts, and ends counter timing.
In this structure of position indicator of the present invention, known according to force analysis, nib 8 pressure equals the elastic force of spring, and the introducing of spring makes it possible to measure the size of nib 8 power that are subject to.Below how explanation is recorded to nib 8 power that are subject to.
The method of measured pressure value F, mainly comprises the following steps:
After stressed the pressing of nib, pressure-acting is on pole plate 2, and spring stress generation deformation x, equates with the displacement of pole plate 2, obtains the displacement d of pole plate 2 according to formula 1 and formula 2.
F=kx (formula 1)
D=x (formula 2)
Wherein, k is the elasticity coefficient of spring 10.
The displacement of the second pole plate 4 causes the long-pending S of right opposite between pole plate to change, as shown in Equation 3.
S=ld (formula 3)
Wherein, l is the width of intersection between the first pole plate 3 and the second pole plate 4, generally speaking, for convenience of calculation, the width of the first pole plate 3 and the second pole plate 4 is set to equate, and coincidence completely on width, and l is the width of the first pole plate 3 or the second pole plate 4 like this.
After the long-pending S of right opposite changes between pole plate, just affect the size of capacitance C, as shown in Equation 4.
Wherein, electric capacity K is electrostatic force constant, and ε is specific inductive capacity, and D is the distance between the first pole plate 3 and the second pole plate 4.
When after capacitance C size variation, will affect capacitor charge and discharge t, take the duration of charging as example, as shown in Equation 5.
Wherein, R is circuit resistance, and U is the voltage of power supply in charging and discharging road, U
efor the reference voltage on the pin on the input end of comparer, can set by program the size of reference voltage level.As mentioned above, when circuit discharging voltage drop is to voltage U
etime will produce interruption, thereby make counter stop counting, each gate time interval equates, and then draws gate time t.
The capacitor charge and discharge time, t changed, and just affected the times N of the counter of processor, as shown in Equation 6.
Wherein, Δ t is the time interval that counter is counted each time.
Obtain formula 7 according to formula 1-formula 6 simultaneous, just can obtain pen point pressure size by formula 7.
From formula 7, in k ' formula, each parameter is constant, therefore only need to, according to the times N of the counter of processor, can draw the power being subject to.
Variable condenser of the present invention and utilize the position indicator of this variable condenser, adopt pressure to cause pole plate to slide, thereby the right opposite that between pole plate, relative position changes between pole plate amasss, spring deformation is directly proportional to right opposite is long-pending, thereby accurately obtains the size of pressure; In addition, adopt micromatic setting to regulate the position of pole plate, the right opposite changing between pressure-less state bottom crown amasss, and overcomes the problem of " leaking " and " not water outlet ".
Finally it should be noted that, the foregoing is only preferred embodiments of the present invention, rather than restriction to technical solution of the present invention, any being equal to that the technology of the present invention feature is done, replaces or corresponding improvement, still within protection scope of the present invention.
Claims (6)
1. a variable condenser, is characterized in that, for pressure input device, comprising:
Capacitor casing (6);
Be arranged on the insulating medium (5) in housing (6), it has two relative sides;
The first pole plate (3), it is vertically arranged on a side of insulating medium (5);
The second pole plate (4), it is vertically arranged on the opposite side of insulating medium (5), and contacts with the side of insulating medium (5);
Elastomeric element, it is connected with the second pole plate (4);
Wherein, in the time that the second pole plate (4) is not under pressure, it is zero that the right opposite between the first pole plate (3) and the second pole plate (4) amasss, thereby the capacitance of variable condenser is zero; In the time that the second pole plate (4) is under pressure, it moves upward and elasticity of compression parts, amass with the right opposite changing between the first pole plate (3) and the second pole plate (4), thus the capacitance of change variable condenser;
This variable condenser also comprises micromatic setting (9), for adjusting the position of the first pole plate (3), changes the first pole plate (3) under pressure-less state and amasss with the right opposite of the second pole plate (4);
This variable condenser forms capacitor charge and discharge loop, obtains the force value that the second pole plate is subject to by the time that discharges and recharges of detecting this variable condenser.
2. variable condenser as claimed in claim 1, is characterized in that, also comprises:
Be arranged on first insulation barrier (11) of the second pole plate (4) top;
The second insulation barrier (12), the below that it is arranged on the bottom of capacitor casing (6) and is positioned at the second pole plate (4), extraneous applied pressure acts on this second insulation barrier (12).
3. variable condenser as claimed in claim 2, is characterized in that, elastomeric element is spring (10), and it is upper that one end of this spring (10) is fixed on the first insulation barrier (11), and the other end is fixed on the top inner surface of capacitor casing (6).
4. variable condenser as claimed in claim 1, is characterized in that, in the time that the second pole plate (4) is not under pressure, elastomeric element in the raw.
5. use, as a position indicator for the variable condenser of claim 1-3 any one, is characterized in that, comprising:
For the shell gripping;
For the variable condenser of gaging pressure, wherein, the first pole plate (3) is drawn out to outside capacitor casing (6) by the first conducting rod (1), the second pole plate (4) is drawn out to outside capacitor casing (6) by the second conducting rod (2), and the second insulation barrier (12) is arranged on the bottom of capacitor casing (6) and is positioned at the below of the second pole plate (4);
Processor, this processor is connected with variable condenser with the second conducting rod (2) by the first conducting rod (1), for measuring the time that discharges and recharges of variable condenser.
6. position indicator as claimed in claim 5, is characterized in that, also comprises the nib (8) that is arranged on outer casing end, and its one end is fixed on second insulation barrier (12) of variable condenser, and the other end extends to the outside of shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110300001.4A CN102509613B (en) | 2011-09-27 | 2011-09-27 | Variable capacitor and position indicator using same |
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| CN201110300001.4A CN102509613B (en) | 2011-09-27 | 2011-09-27 | Variable capacitor and position indicator using same |
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| CN102509613A CN102509613A (en) | 2012-06-20 |
| CN102509613B true CN102509613B (en) | 2014-06-18 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102880318A (en) * | 2012-08-31 | 2013-01-16 | 鸿富锦精密工业（深圳）有限公司 | Handwriting pen and capacitive pressure sensing element thereof |
| CN104156088A (en) * | 2013-05-14 | 2014-11-19 | 汉王科技股份有限公司 | Active capacitance pen and touch control device |
| CN103440980A (en) * | 2013-08-26 | 2013-12-11 | 铜陵亿亨达电子有限责任公司 | Pulse capacitor with pressure switch |
| CN105606269B (en) * | 2015-09-11 | 2018-04-03 | 东南大学 | A kind of capacitance pressure transducer, with high linearity and preparation method thereof |
| CN105553500B (en) * | 2015-12-08 | 2018-03-13 | 深圳天珑无线科技有限公司 | A kind of antenna-matching circuit and electronic equipment |
| CN107102782B (en) * | 2016-02-22 | 2023-03-14 | 台湾艾华电子工业股份有限公司 | Position sensor and variable capacitance component thereof |
| CN108345394B (en) * | 2017-01-25 | 2020-12-22 | 宏碁股份有限公司 | Input device |
| CN106952729B (en) * | 2017-04-12 | 2018-10-30 | 鲁伯特（北京）教育科技有限公司 | A kind of time writer containing annular variable capacitance |
| CN109387306A (en) * | 2017-08-14 | 2019-02-26 | 群光电子股份有限公司 | Strength detection method and touch device |
| CN109473283A (en) * | 2018-12-03 | 2019-03-15 | 伍颖超 | Variable condenser using the external electrode of multilayer ceramic capacitor as fixed electrode |
| CN111750905B (en) * | 2019-03-29 | 2023-05-09 | 财团法人工业技术研究院 | Micro-electromechanical sensing device capable of adjusting induction capacitance value |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0249412A (en) * | 1988-08-11 | 1990-02-19 | Chichibu Cement Co Ltd | Variable capacitor device |
| JPH08227336A (en) * | 1995-02-20 | 1996-09-03 | Wacom Co Ltd | Pressure sensing mechanism and stylus pen |
| JPH08327715A (en) * | 1995-05-31 | 1996-12-13 | Nippon Telegr & Teleph Corp <Ntt> | Resonance circuit device |
| JPH0992574A (en) * | 1995-09-25 | 1997-04-04 | Mitsubishi Materials Corp | Trimmer capacitor |
| JP5109171B2 (en) * | 2007-09-18 | 2012-12-26 | 株式会社ワコム | Position indicator, position input device, and computer system |
| CN101751156B (en) * | 2008-12-12 | 2012-10-24 | 株式会社和冠 | Coordinate input device, position indicator and variable condenser |
| JP5442479B2 (en) * | 2010-02-05 | 2014-03-12 | 株式会社ワコム | Indicator, position detection device and position detection method |
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Effective date of registration: 20161129 Address after: 100193 Beijing, Haidian District, northeast Wang West Road, building 3, floor 363, room 5, room 8 Patentee after: BEIJING HANVON PENGTAI TECHNOLOGY CO., LTD. Address before: 100193 Beijing, Haidian District, northeast Wang West Road, building 3, floor 5, layer 8 Patentee before: Hanwang Tech Co., Ltd. |
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Address after: 100193 363, 3 floor, 5 building, 8 Northeast Road, Haidian District, Beijing. Patentee after: Beijing Hanvon Peng Thai Polytron Technologies Inc Address before: 100193 363, 3 floor, 5 building, 8 Northeast Road, Haidian District, Beijing. Patentee before: BEIJING HANVON PENGTAI TECHNOLOGY CO., LTD. |
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