CN202221987U - Capacitance type touch induction keyboard and local instrument - Google Patents
Capacitance type touch induction keyboard and local instrument Download PDFInfo
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- CN202221987U CN202221987U CN2011203789868U CN201120378986U CN202221987U CN 202221987 U CN202221987 U CN 202221987U CN 2011203789868 U CN2011203789868 U CN 2011203789868U CN 201120378986 U CN201120378986 U CN 201120378986U CN 202221987 U CN202221987 U CN 202221987U
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Abstract
The utility model discloses a capacitance type touch induction keyboard, comprising a touch panel, a touch induction unit, a touch detection unit and a main control module which are connected together in turn, wherein the touch induction unit comprises an induction electrode and a reference electrode which are arranged in interval. The utility model also discloses a local instrument using the capacitance type touch induction keyboard, comprising an instrument shell and the capacitance type touch induction keyboard, wherein a touch panel of the capacitance type touch induction keyboard is fixed on the instrument shell to form a sealed space and other components of the capacitance type touch induction keyboard are arranged in the sealed space. The service life of a press key is increased, the reliability of the local instrument is greatly increased; a step of operating the local instrument only after uncapping the instrument is not needed, thus the local instrument is safe and convenient; the full sealed construction better facilitates the sealing design requirement of the local instrument; the keyboard directly replaces the existing mechanical type press-key switch without changing a local instrument control system program.
Description
Technical field
The utility model relates to industrial automation field instrument field, relates in particular to a kind of capacitance touch induction keyboard and field instrument.
Background technology
Instrument and meter for automation is the production process soul of control automatically.The industrial process automation instrument mainly is divided into two types, and the one, the control room instrument, another is a field instrument.Field instrument is meant the commercial production scene that is operated in, and the one type of instrumentation instrument that replaces people that the technological parameter in the production process is measured, controls, supervised and protects is to realize the requisite technical tool of Automation of Manufacturing Process.The transmitter of for example scene temperature, pressure, flow, thing position being measured and all belong to field instrument according to regulating actuator that rule and order control process units etc.Along with progress of science and technology, field instrument develops towards the direction of digitlization, intellectuality, networking.
In the intelligence instrument, man-machine interface is indispensable important component part in modern times.Generally speaking, the people to the input of the intervention of instrument state and data the most frequently used be keyboard.In the commercial production; When field instrument need be provided with some parameters or switching state; Must open the end cap operation of instrument; But carry out the parameter setting and be not allowed to opening end cap like higher places of some requirement of explosion proof such as oil, chemical industries, be restricted so existing needs are opened the range of application that the instrument end cap is provided with the field instrument of parameter.
In addition, in the prior art, the input keyboard of field instrument is normally formed by mechanical key combination, and like key switch, thin film switch etc., button is carried out in its contact of need moving.The most frequently used is to push keyboard with hand to accomplish input action, through pressing the motion contact, makes two electric pole short circuits of key switch, thereby forms actuation of keys.But the common feature of the press-key structure of motion contact is to use the moved fatigue life and the wear-out life of contact of life-span to restrict, and is shorter relatively.And the general residing environment of field instrument is more abominable, in case keyboard damage, just can not the local operation field instrument, and change button or replacing instrument, wasting manpower and material resources not only, even influence the progress of production process causes bad consequence.
And in order to reach sealing and purpose attractive in appearance, the existing common way of instrument is that keyboard is arranged on enclosure interior, covers as the key position mark with materials such as fexible films, and the demonstration cover with the band clear glass seals whole instrument housing then.In the time will operating to instrument, need uncap to carry out button again, this design is not only dangerous but also inconvenient.In addition, this kind mode has the comparison strict restriction to the rigidity and the thickness of the cover stock material selected for use, and is higher to manufacturing technique requirent.
In sum, that the mechanical type button that adopts in the existing field instrument exists is easy to wear, useful life problem such as weak point, poor reliability.
The utility model content
The technical problem that the utility model will solve is; Mechanical type button to field instrument in the prior art uses is easy to wear, useful life short, poor reliability; And use field instrument operation inconvenience, the more high defective of manufacturing technique requirent of this mechanical type button, a kind of capacitance touch induction keyboard and a kind of field instrument safe, easy and simple to handle that adopts this capacitance touch induction keyboard of reliability and durability is provided.
The utility model solves the technical scheme that its technical problem adopted:
A kind of capacitance touch induction keyboard is provided, comprises the touch panel, touch sensing unit, touch detection unit and the main control module that link to each other successively, said touch sensing unit comprises induction electrode and the reference electrode that is provided with at interval.
In the utility model capacitance touch induction keyboard, said touch panel is the transparent polymethyl methacrylate with preset thickness.
In the utility model capacitance touch induction keyboard, the silk-screen that said touch panel links to each other with said touch sensing unit has by key label.
In the utility model capacitance touch induction keyboard, said touch sensing unit comprises the induction electrode and the reference electrode of the adjacent setting of coplane, and said induction electrode links to each other with said touch detection unit.
In the utility model capacitance touch induction keyboard; Said touch sensing unit and said touch detection unit are positioned on the touch key-press plate; Said induction electrode and said reference electrode are positioned on the one side of said touch key-press plate near said touch panel, and said induction electrode is pasted on the button marked region of said touch panel through double faced adhesive tape.
In the utility model capacitance touch induction keyboard, said induction electrode is the PCB Copper Foil of pre-set dimension.
In the utility model capacitance touch induction keyboard, said touch detection unit comprises electric capacity digital conversion circuit, processor and environmental parameter corrective system.
In the utility model capacitance touch induction keyboard, said touch detection unit is that the multichannel that need not to programme touches IC.
The utility model also provides a kind of field instrument; Comprise instrument housing and above each described capacitance touch induction keyboard; The touch panel of capacitance touch induction keyboard is fixed on the said instrument housing and forms seal cavity, and the touch sensing unit of said capacitance touch induction keyboard, touch detection unit and main control module are positioned at said seal cavity.
In the utility model field instrument, said field instrument also comprises display, and said display is fixed on the said touch panel, and is positioned at said seal cavity, and said display and said touch sensing unit and said main control unit are electrically connected respectively.
The beneficial effect of a kind of capacitance touch induction keyboard of the utility model and field instrument is: through adopting the touch sensible button of no mechanical moving component; Avoided the keys deactivation that mechanical wear caused of motion contact; Increase the useful life of button, increased the reliability of field instrument greatly; Can realize keypress function through pointing on this panel of direct touch respective regions, remove the step of only uncapping and could operate field instrument from, meet the requirement of explosion proof of field instrument, safe and convenient; Touch panel is fixed on the panel housing, and touch panel can be arranged to totally enclosed structure like this, more helps the Seal Design needs of field instrument, can play a series of protective actions such as waterproof and dustproof; Adopt touch sensing unit and touch detection unit to accomplish the touch key-press status monitoring function, can directly substitute the prior mechanical key switch, and need not to revise field instrument control system program.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is a kind of front view that adopts the field instrument of capacitance touch induction keyboard according to the utility model embodiment;
Fig. 2 is the structural representation according to a kind of capacitance touch induction keyboard of the utility model embodiment;
Fig. 3 is according to the capacitance touch induction keyboard of the utility model one preferred embodiment and the partial structurtes sketch map of display panel;
Fig. 4 A-C is the keypad sensing unit sketch map according to a kind of capacitance touch induction of the utility model embodiment;
Fig. 5 is a kind of capacitance touch induced key system finger electric capacity sketch map according to the utility model embodiment;
Fig. 6 is a kind of capacitance touch IC theory diagram according to the utility model embodiment;
Fig. 7 is a kind of capacitance touch IC JR9804B application circuit schematic diagram according to the utility model embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 is the front view according to the field instrument of the employing capacitance touch induction keyboard of the utility model embodiment.In the present embodiment, a kind of field instrument of capacitance touch induction keyboard that adopts comprises instrument housing 101 and capacitance touch induction keyboard 103.In addition, this field instrument can also optionally comprise display 104.At the scene in the instrument; The touch panel 102 of capacitance touch induction keyboard 103 is fixed on the instrument housing 101 and forms seal cavity; Other parts of capacitance touch induction keyboard 103 comprise touch sensing unit, touch detection unit and detecting unit, are positioned at seal cavity.In addition, when comprising display 104, display 104 is fixed on the touch panel 102, and is positioned at above-mentioned seal cavity.
In a preferred embodiment; Touch panel 102 is fixing through screw and instrument housing 101; And touch panel 102 is equipped with sealing gasket near being provided with groove around the one side of seal cavity in the groove, and touch panel 102 closely contacts the formation seal cavities through sealing gasket with instrument housing 101.In the preferred embodiment, behind locking panel hold-down screw, this sealing gasket makes the purpose that reaches sealing between touch panel 102 and the instrument housing 101 owing to being extruded distortion.
In a further advantageous embodiment, field instrument also comprises display 104.Display 104 is fixed on the one side of touch panel 102 near seal cavity, and display 104 is electrically connected respectively with touch sensing unit and main control unit.It will be appreciated by those skilled in the art that display generally includes display screen and display panel (for example pcb board), display screen is contained on the display panel, and can be through screw on the one side of touch panel 102 near seal cavity.Can on touch panel 102, divide and show observation window and silk-screen zone.The viewing area of display screen can be positioned at show observation window below.
In a further advantageous embodiment, silk-screen has the button pattern on the touch panel 102, and this pattern is positioned at the silk-screen zone.
On being electrically connected, can be connected transmission of electric signals through electrical cables such as FPC connecting lines between touch induction keyboard 103 and the display 104; And can realize electrical communication through electrical cables such as winding displacements between the main control module of display 104 and instrument; Main control module to display 104 power supply and output LCD display control signal, is accepted the feedback signal of telecommunication from touch induction keyboard etc. through this connecting line simultaneously.
During field instrument work, display 104 and touch induction keyboard 103 oriented manipulation personnel, operating personnel can watch the display message of LCD display through transparent demonstration observation window; When the needs scene is provided with the instrument parameter or switches meter status; Operating personnel can directly realize button operation with the respective regions of finger touch induction keyboard 103; After the instrument main control module receives key commands, carry out corresponding program circuit, accomplish corresponding keypress function.
Fig. 2 is the structural representation according to a kind of capacitance touch induction keyboard of the utility model embodiment.In the present embodiment, a kind of capacitance touch induction keyboard can comprise touch panel 210, touch sensing unit 220, touch detection unit 230 and the main control module 240 that links to each other successively.
The principle of this capacitance touch induction keyboard is to be full of conductive electrolyte in the human skin tissue, has finger electric capacity, and finger touch can cause touch sensing system electric capacity to change, and can judge through detecting capacitance change whether finger touches.Through certain algorithm, also can further judge to touch the position that takes place, reach the function of knowing key.
In certain embodiments, touch detection unit 230 can become one with main control module 240, accomplishes the function that key-press status detected and touched logical decision by the monolithic integrated circuit of band microcontroller.
Fig. 3 is according to the capacitance touch induction keyboard of the utility model one preferred embodiment and the partial structurtes sketch map of display panel.In the present embodiment; A kind of capacitance touch induction keyboard can comprise touch panel 210, touch sensing unit 220, touch detection unit 230 and main control module 240 (not shown); Wherein, Touch sensing unit 220 all is positioned on the touch key-press plate 204 with touch detection unit 230, and touch key-press plate 204 is electrically connected with display panel 206.The cardinal principle of the utility model is that human body exists finger electric capacity; When on the finger touch panel during key area; Utilize the capacitance variations of touch detection unit 230 (for example touching IC) senses touch sensing unit 220 to judge actuation of keys, thereby realize keypress function field instrument.
Touch key-press plate 204 be arranged in Fig. 1 touch induction keyboard 103 silk-screens zones under.Generally speaking, touch key-press plate 204 can adopt common FR4 pcb board, thickness of slab 1.6mm.Touch sensing unit 220 is positioned on the touch key-press plate 204 with touch detection unit 230.As shown in Figure 3, touch sensing unit 220 lays respectively on the two sides of touch key-press plate 204 with touch detection unit 230.Touch sensing unit 220 can comprise the induction electrode 241 and reference electrode 242 of adjacent setting.As shown in Figure 3; Induction electrode 241 is positioned at touch panel 210 sides of touch key-press plate 204; It can be made up of the PCB Copper Foil on the touch key-press plate 204; Also can adopt other conductor, like sheet metal, spring, electrically conductive ink and ito glass etc., the shape and size of induction electrode also can be adjusted within the specific limits.Reference electrode 242 can cover copper by the PCB on the touch key-press plate 204 or pad constitutes.The touch sensing unit 220 of touch induction keyboard is formed in induction electrode 241, reference electrode 242 and the gap between them jointly.Induction electrode 241 is connected with touch detection unit 230; The another side that for example is positioned at touch key-press plate 204 when touch detection unit 230 is when (also claiming the back side), and induction electrode 241 can be connected to touch detection unit 230 through the mode of via hole and touch key-press plate 204 back side PCB cablings.When wiring, this cabling should be tried one's best thin and short, and avoids reaching the purpose that reduces parasitic capacitance and interference near the high-frequency signal line.In certain embodiments; Between silk-screen layer 202 and the touch key-press plate 204 adhesive-layer 203 is arranged, generally adopt the high viscosity glue of insulation, be used for touch key-press plate 204 is close to the back side of touch panel 210; Do not allow to leave bubble during stickup, in order to avoid influence the sensitivity of touch sensible button.For preventing that the instrument vibration from causing touch key-press plate 204 and touch panel 210 to come off; In a preferred embodiment of the utility model; Can also adopt the mode of mounting bracket 205; Touch key-press plate 204 is pressed in touch panel 210, and they are pressed on the main casing 101, avoid between them forming the space and influence the touch sensible effect.Display panel 206 is fixed in the back side of touch panel 102.244 and 261 is respectively the FPC socket that is welded on touch key-press plate 204 and the display panel 206, realizes being electrically connected through FPC connecting line 245 between them.Pass through on the display panel 206 then and the winding displacement between the main control module 240, can realize the electrical communication between capacitance touch induction system and the main control module.
Fig. 4 is a kind of capacitance touch induced key plate sensing unit sketch map of the utility model embodiment.Present embodiment has 4 key switches, like the K1～K4 among Fig. 3.To single button such as K1, its touch sensing unit is made up of induction electrode 301, gap 302 and reference electrode 303.For avoiding the point discharge influence to touch effect, the induction electrode 301 of a preferred embodiment of the utility model adopts round-shaped.In touch panel 210 materials and thickness one timing; Touch key-press sensitivity is directly proportional with induction electrode 301 areas; Consider the light degree of button operation; The circular Copper Foil that preferred embodiment of the utility model adopts diameter 13mm is as induction electrode 301, and the back side of induction electrode 301 does not allow to cover copper and cabling.The effect in gap 302 is similar to the polar plate spacing of plane-parallel capacitor, and to the influential effect of parasitic capacitance size of touch sensible key system, this preferred embodiment value is about 0.5mm.Reference electrode 303 is connected with the ground wire of touch detection unit 230 through the PCB cabling, and for reducing parasitic capacitance and enhancing touch sensing system antijamming capability, reference electrode 303 adopts 45 ° grid to cover copper mode ground connection.To a plurality of buttons,, should be noted that the distance between the adjacent induction electrode can not be too little, otherwise the phenomenon of " misoperation " can occur like the K1 in the present embodiment, K2, K3, K4.Adopt two aspect measures to prevent adjacent key " misoperation " for the utility model embodiment: the one, cover earth grid copper between the adjacent key induction electrode and reduce the phase mutual interference; Doing some processing aspect the software of touch detection unit 230 on the other hand; Adopt adjacent key inhibition technology; Be that the button that capacitance variations is bigger in the adjacent key is considered to effective touch, what capacitance variations was less relatively then is left in the basket, and the method helps to make the less intensive keyboard of spacing.
Fig. 5 A-C is a kind of capacitance touch induced key system finger electric capacity sketch map of the utility model embodiment.In general, finger electric capacity is divided into two kinds.First kind is newborn electric capacity, and shown in Fig. 5 A, exciting signal source 402 connects unsettled key induced electrode, finger near having increased electric field strength therebetween, power line 401 density rise thereupon, inductance capacitance also just increases thereupon.Another kind is the finger modulating capacitor, and promptly finger also can be modulated the distribution of existing electric capacity.Shown in Fig. 5 B and 5C, in the design of capacitance touch button, plane annularly on the cloth around the key induced electrode usually, the touch of finger can change the distribution of power line, has modulated the electric capacity of button.403 are electric force lines distribution sketch map before touching, and 404 is the electric force lines distribution sketch map of sensing unit behind the finger touch.
Fig. 6 is a kind of capacitance touch IC theory diagram of the utility model embodiment, and it can comprise electric capacity digital conversion circuit (CDC), processor (Processor) and environmental parameter corrective system (Self Calibration) as touch detection unit 230.Capacitance touch IC shown in Figure 5 adopts 16pin NSOP encapsulation, and volume is little, is convenient to install.Its basic principle is to use the capacitance variations on the high-precision CDC of 16bit (digital capacitance transducer) the IC detection induction electrode (Sensor) to discern the touch action of finger; The data of CDC output are handled with the high-efficiency reliable algorithm by embedded risc processor, and outwards directly the output high-low level is indicated actuation of keys.In addition, also can adjust touch sensible capacity ratio threshold values automatically, reduce the influence of environmental factor the touch sensible key system according to environmental parameter.Practical application can be selected corresponding capacitance touch IC model according to the button number of active lanes and with the main control module interface mode.
The field instrument of present embodiment is the two-wire system level transmitter; Two lines are used for the 24VDC instrument power supply, export 4～20mADC loop current signals simultaneously, and touch induction keyboard is made up of 4 touch key-presss; When the finger touch button; Output low level is given instrument main control module MCU, and when not touching, the output high level is given instrument main control module MCU.In addition, also require touch sensing system to have super low-power consumption, any key wakes up and function such as Macintosh.
According to above requirement; Preferred embodiment of the utility model selects for use JR9804B as touching IC, and its input voltage range is 2.2V～5.5V, and operating current is 1.5uA/3V; 4 touch sensible passages are arranged, be successfully applied in the control panel of electronic equipment for consumption, household electrical appliance etc.Its application circuit is very simple, only needs a little peripheral Resistor-Capacitor Unit to get final product.The more important thing is that it need not programming, the appearance value size that sensitivity is regulated through adjustment sensitivity electric capacity realizes.But this only is a preferred embodiment of the utility model; Be not limited to the utility model; In other embodiment of the utility model, touch detection unit 230 (promptly touching IC) also can adopt IC other model, able to programme or non-programmable, like WTC6104BSI etc.
Fig. 7 is a kind of capacitance touch IC JR9804B application circuit schematic diagram that is used for field instrument of the utility model embodiment.As shown in Figure 6, this application circuit mainly is provided with five parts such as pin (W_OM, STG), touch sensible sensitivity adjusting pin (C_R) and forms by power supply (VDD, GND), touch sensible input pin (S1, S2, S3, S4), output pin (OUT1, OUT2, OUT3, OUT4), chip mode.What JR9804B measured is the minor variations of electric capacity, requires ripple and the noise at power vd D pin place little, note avoiding the extraneous strong jamming that sealed in by power supply VCC1, so require power supply to have than high stability.When power supply is unstable, need adds LDO and handle.The power supply VCC1 of the utility model embodiment takes from the instrument host power supply, handles through voltage stabilizing, arrives 11 pin of U1 then through filtering, supplies power to U1.L1 is a magnetic bead among Fig. 6, and effect is the conducted interference that suppresses on the power line.C1, C2, C3 are filter capacitor, and when the PCB fabric swatch, the place ahead that capacitor C 2, C3 should receive electrochemical capacitor C1 could suppress high-frequency noise preferably, and filter capacitor C6 should place near chip U1 pin VDD place.K1, K2, K3, K4 are induction electrode; Be connected to input pin S1, S2, S3, the S4 of U1 respectively through the PCB cabling; These PCB cablings have just constituted input channel S101, S102, S103, the S104 of this touch sensing system; For guaranteeing that the touch sensible button has sensitivity preferably and avoids false triggering, input channel S101, S102, S103, S104 should be placed on the back side of the PCB relative with inductive disks through via hole, and line will be lacked with thin as far as possible.Output signal OUT1, OUT2, OUT3, OUT4 be input S1, S2, S3, the S4 of corresponding touch sensible respectively; For example when finger induction electrode K1; Touch the capacitance variations signal and import the inner testing circuit of JR9804B into through input channel S101; Through touch to detect decision logic will output key signal (like low level) to output pin OUT1, the J1_6 pin through FPC socket J1 is input to the MCU pin in the instrument main control module then, and then carries out the corresponding function of button K1.This OUT1, OUT2, OUT3, OUT4 pin are that NMOS opens leakage output type, and present embodiment has pull-up resistor because of instrument main control module MCU input port, therefore do not need at J1_3, J1_4, J1_5, the external pull-up resistor in J1_6 place.The W_OM of U1 is that awakening mode is provided with pin, and this pin connects " 0 " in the present embodiment, and the expression multikey wakes up; When W_OM connect " 1 ", the expression singly-bound woke up.The STG pin of U1 is that output mode is provided with pin, and present embodiment STG connects " 0 ", and expression is output as the ON/OFF pattern, and powering on is high-impedance state; When STG connects " 1 ", be output as LEVEL HOLD pattern, powering on is high-impedance state.The C_R of U1 is worth the adjustment that realizes touch sensible sensitivity for going out touch sensible sensitivity adjustable side through the appearance of selecting suitable sensitivity control capacittance C4.For guaranteeing good temperature characterisitic, the patch capacitor of the X7R material of the sensitivity control capacittance C4 selection 10% in the present embodiment.Present embodiment selects for use the thick polymethyl methacrylate of 5mm as touch panel, therefore regulates touch sensible sensitivity through the size of adjustment C4.The appearance value of C4 is big more, and touch sensible sensitivity is just high more.Be convenient and regulate that it is sensitive excessively that preferred embodiment of the utility model is divided into four grade: A-with sensitivity, finger near but touch and button just takes place react; The suitable sensitivity of B-, the button reaction can take place in the finger normal touch; It is sensitive that C-owes, and needs bigger finger contact area that the button reaction could take place; D-can't realize keypress function.The utility model embodiment is applied to the industry spot environment, therefore should be with sensitivity adjustment to the B grade, to guarantee the reliability of this field instrument work.When the PCB fabric swatch, can be arranged side by side capacitor C 5 with C4, so that regulate touch sensible sensitivity, do not need time spent capacitor C 5 not weld.NC representes empty pin among Fig. 6, no effect.
Be some preferred embodiments of the utility model more than, be not limited to the utility model.In other embodiment of the utility model, can comprise above-described arbitrary characteristics and/or its combination in any, as long as can realize the spirit of the utility model.
The utility model adopts the thick transparent organic glass of 5mm to constitute touch sensible key system as the touch IC of the key induced plate of touch sensible, band microcontroller as touching capacitance detection unit as touch panel, PCB Copper Foil.Touch panel back side silk-screen has the button pattern, and PCB Copper Foil tablet is pasted on the silk-screen face respective regions of touch panel through 3M high strength double faced adhesive tape, can realize keypress function through pointing on this panel of direct touch respective regions.The utility model has been avoided the keys deactivation that mechanical wear caused of motion contact through adopting the touch sensible button of no mechanical moving component, has increased the useful life of button, has increased the reliability of field instrument greatly; Adopt the thick transparent organic glass of 5mm as the touch key-press touch panel, the polymethyl methacrylate panel hardness aspect that 5mm is thick is fine, is difficult for broken; But display message through display in the transparent panel Direct observation instrument chamber; Back side of panel silk-screen button pattern can be realized keypress function through pointing on this panel of direct touch respective regions, has removed the step of only uncapping and could operate field instrument from; Meet the requirement of explosion proof of field instrument, safe and convenient; Adopt touch panel directly to be connected with the panel housing through adhesive means; The back side has metallic support to compress touch panel; Touch panel can be arranged to totally enclosed structure like this, more helps the Seal Design needs of field instrument, can play a series of protective actions such as waterproof and dustproof; Adopt the monolithic integrated circuit (touching IC) of band microcontroller to accomplish the touch key-press status monitoring function, the alternative touch of practical application IC model is more, can directly substitute the prior mechanical key switch, and need not to revise field instrument control system program.
In addition; The utility model is realized actuation of keys through corresponding key position on finger touch and the panel that instrument housing links to each other; Come the senses touch capacitance variations to judge key-press status through employing electric capacity digital conversion technique then, and, the malfunction phenomenon can not occur in the time of can guaranteeing the product long-term work through automatic backoff algorithm of environmental drift and high-intensity Anti-interference Design; Satisfy industrial standard, be suitable for the field instrument of work under bad environment.In addition, the cooperation of field instrument internal controller program and processing in addition can realize system parameters setting and handoff functionality.
Though the utility model describes through specific embodiment, it will be appreciated by those skilled in the art that, under the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.In addition, to particular condition or material, can make various modifications to the utility model, and not break away from the scope of the utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.
Claims (10)
1. a capacitance touch induction keyboard is characterized in that, comprises the touch panel, touch sensing unit, touch detection unit and the main control module that link to each other successively, and said touch sensing unit comprises induction electrode and the reference electrode that is provided with at interval.
2. capacitance touch induction keyboard according to claim 1 is characterized in that, said touch panel is the transparent polymethyl methacrylate with preset thickness.
3. capacitance touch induction keyboard according to claim 2 is characterized in that, the silk-screen that said touch panel links to each other with said touch sensing unit has by key label.
4. capacitance touch induction keyboard according to claim 3 is characterized in that, said touch sensing unit comprises the induction electrode and the reference electrode of the adjacent setting of coplane, and said induction electrode links to each other with said touch detection unit.
5. capacitance touch induction keyboard according to claim 4; It is characterized in that; Said touch sensing unit and said touch detection unit are positioned on the touch key-press plate; Said induction electrode and said reference electrode are positioned on the one side of said touch key-press plate near said touch panel, and said induction electrode is pasted on the button marked region of said touch panel through double faced adhesive tape.
6. capacitance touch induction keyboard according to claim 5 is characterized in that, said induction electrode is the PCB Copper Foil of pre-set dimension.
7. capacitance touch induction keyboard according to claim 6 is characterized in that, said touch detection unit comprises electric capacity digital conversion circuit, processor and environmental parameter corrective system.
8. capacitance touch induction keyboard according to claim 7 is characterized in that, said touch detection unit is that the multichannel that need not to programme touches IC.
9. field instrument; It is characterized in that; Comprise instrument housing and like each described capacitance touch induction keyboard among the claim 1-8; The touch panel of capacitance touch induction keyboard is fixed on the said instrument housing and forms seal cavity, and the touch sensing unit of said capacitance touch induction keyboard, touch detection unit and main control module are positioned at said seal cavity.
10. field instrument according to claim 9; It is characterized in that said field instrument also comprises display, said display is fixed on the said touch panel; And be positioned at said seal cavity, said display and said touch sensing unit and said main control unit are electrically connected respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203789868U CN202221987U (en) | 2011-09-29 | 2011-09-29 | Capacitance type touch induction keyboard and local instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203789868U CN202221987U (en) | 2011-09-29 | 2011-09-29 | Capacitance type touch induction keyboard and local instrument |
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| CN202221987U true CN202221987U (en) | 2012-05-16 |
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- 2011-09-29 CN CN2011203789868U patent/CN202221987U/en not_active Expired - Lifetime
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Granted publication date: 20120516 |