CN102098036A - Capacitive touch key device and manufacturing method thereof - Google Patents
Capacitive touch key device and manufacturing method thereof Download PDFInfo
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- CN102098036A CN102098036A CN2010106047821A CN201010604782A CN102098036A CN 102098036 A CN102098036 A CN 102098036A CN 2010106047821 A CN2010106047821 A CN 2010106047821A CN 201010604782 A CN201010604782 A CN 201010604782A CN 102098036 A CN102098036 A CN 102098036A
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Abstract
The invention relates to a capacitive touch key device and a manufacturing method thereof. The device comprises a semitransparent printed circuit board; the front of the printed circuit board is a part surface, and the back of the printed circuit board is a welding surface; the part surface of the printed circuit board is directly provided with a key icon through silk print, and also provided with a touch pad; a touch pad is arranged around the key icon; and the welding surface of the printed circuit board is provided with a light source. The manufacturing method comprises the following steps of: performing silk print of the key icon on the part surface of the semitransparent printed circuit board; providing the touch pad around the key icon; performing silk print of an ink layer on the welding surface of the printed circuit board; and arranging the light source on the welding surface of the printed circuit board. The capacitive touch key device and the manufacturing method thereof have the advantages that: the detection sensitivity and the stability of the capacitive touch key device are improved; and the cost of the capacitive touch key device is reduced.
Description
Technical field
The present invention relates to the touch key-press field, relate in particular to device of a kind of capacitance type touch key and preparation method thereof.
Background technology
The capacitance type touch key technology was advanced by leaps and bounds in recent years, compared with traditional mechanical key, and the life-span of capacitance touch induced key is long, and power consumption is little, and volume is little, durable.It has overturned traditional mechanical key control, as long as touching gently just can realize the switch control to button, quantizes to regulate even direction control.
The detection principle of capacitance touch button is to have judged whether key response by the variable quantity of measuring capacitor's capacity.Wherein the appearance value of electric capacity and area, medium and the distance dependent between two electric conductors, therefore the capacitance touch button relates to the design that touches pad and touch panel, medium and the area between two conductors of electric capacity wherein, normal relevant in design with dielectric material and panel material, can not change mostly, thereby can only start with to the distance of touch panel from changing the touch pad.Usually, for capacitance type touch key, the influence of touch action to the capacitance size variation depended in the sensitivity of touch sensible, therefore it is the smaller the better to the distance between touch panel to touch pad, because ability guarantor's extraneous contacts such as finger are in the front and back of contact touch panel like this, the changes in capacitance value is enough big, and the capacitance variation amount is big more, the sensitivity of touch key-press induction is high more, and follow-up touch circuit cost is just low more, and the product of working it out like this is just stable more.The PCB (PCB=Printed Circuit Board, Chinese are printed circuit board) that present capacitance touch key device is adopted mostly is doubling plate greatly, and that one deck that wherein is provided with part surface is a top layer, and that one deck that is provided with solder side is a bottom.The light source that present capacitance touch key device is adopted, all be arranged on the top layer of pcb board mostly, this can make the PCB top layer touch the distance increase of pad to touch panel, cause its capacitance variations drop less, thereby the detection sensitivity and the stability of capacitance touch key device have been had influence on, and the employing light source is arranged on the structure of pcb board top layer, all must increase the film of one deck silk-screen key icon mostly between light source and touch panel, and this can further increase the cost of capacitance type touch key.
Summary of the invention
The invention provides a kind of capacitance type touch key device, have the sensitivity of capacitance touch keypress function and the problem that stability is low and capacitance touch button cost is high in the solution prior art.
The present invention for the technical scheme that provides is provided is: comprise translucent printed circuit board, the front of described printed circuit board is a part surface, reverse side is a solder side, the direct silk-screen of the part surface of described printed circuit board has key icon, the part surface of described printed circuit board also is provided with the touch pad, described touch pad be arranged on described key icon around, the solder side of described printed circuit board is provided with light source.As a further improvement on the present invention, described light source is arranged on the below of described key icon.
As a further improvement on the present invention, described touch pad ring distributed around described one week of key icon.
As a further improvement on the present invention, silk-screen has lighttight ink lay on the solder side of described printed circuit board (PCB), and described ink lay is provided with and the corresponding zone of leaving a blank of described key icon.
As a further improvement on the present invention, described key icon is a kind of or its combination in any in polygon, square, rhombus, the circle.
As a further improvement on the present invention, described touch pad is arranged to a kind of or its combination in any in corresponding polygon, square, rhombus, the circle around described key icon.
The present invention also provides the manufacture method of described capacitance type touch key device, and this method may further comprise the steps:
(a) silk-screen key icon on the part surface of translucent printed circuit board;
(b) the touch pad is set around described key icon;
(c) ink for screen printing layer on the solder side of described printed circuit board;
(d) on the solder side of described printed circuit board, arrange light source.
As a further improvement on the present invention, comprise in the described step (b): described touch pad ring was provided with around described one week of key icon, and described touch pad is arranged to and described key icon 1 corresponding shape.
As a further improvement on the present invention, comprise in the described light source step (c): position relative with described key icon on the solder side of described printed circuit board is provided with the zone of leaving a blank, and on the solder side of printed circuit board except the zone of leaving a blank the above ink laies of silk-screen all, wherein said ink lay is light tight ink lay.
As a further improvement on the present invention, comprise in the described light source step (d): light source is set in the described zone of leaving a blank.
The invention has the beneficial effects as follows: owing to adopted translucent printed circuit board, key icon directly silk-screen on the part surface of printed circuit board, light source can be arranged on the solder side of printed circuit board, make the touch pad reduce to the distance of touch panel, thereby can improve the detection sensitivity and the stability of capacitance touch key device, and because the capacitance touch key device has adopted this design, can save the film of that layer silk-screen key icon that will use in the design of capacitance touch key device in the prior art, thereby further reduce the cost of capacitance touch key device.
Description of drawings
Fig. 1 is the key icon of capacitance type touch key device silk-screen of the present invention and touches the pad schematic diagram;
Fig. 2 is the ink lay schematic diagram of capacitance type touch key device of the present invention;
Fig. 3 is the floor map of capacitance type touch key device of the present invention.
Drawing reference numeral: 1, key icon, 2, the key icon background colour, 3, icon, 4, touch pad, 5, ink lay.
Embodiment
The present invention is further described below in conjunction with description of drawings and embodiment.
Capacitance type touch key device of the present invention, comprise translucent printed circuit board, the front of described printed circuit board is a part surface, reverse side is a solder side, the direct silk-screen of the part surface of described printed circuit board has key icon 1, the part surface of described printed circuit board also is provided with and touches pad 4, described touch pad 4 be arranged on described key icon 1 around, the solder side of described printed circuit board is provided with light source.It is substrate that described translucent printed circuit board is selected glass fiber material for use, and this material transparency height helps the transmission of light.
As shown in Figure 1, be the key icon 1 of capacitance type touch key device silk-screen of the present invention, further, the profile of described key icon 1 can be designed to a kind of or its combination in any in polygon, square, rhombus, the circle.
As shown in Figure 1, touch pad 4 for capacitance type touch key device of the present invention, described touch pad 4 was provided with around one week of described key icon, and described touch pad 4 corresponds to key icon 1 and is arranged to a kind of or its combination in any in polygon, square, rhombus, the circle.
As shown in Figure 2; be capacitance type touch key device ink lay 5 of the present invention; described ink lay 5 silk-screens are at the solder side of pcb board; described ink lay 5 is light tight insulation protection ink laies such as green oil, butter, dirty oil; but only limit to silk-screen outside the zone of key icon 1 correspondence; as ink lay 5 on the part silk-screen outside the zone corresponding among Fig. 2 with key icon 1; then leave a blank in the zone corresponding with key icon 1; the described ink lay 5 of silk-screen not; because pcb board is selected translucent base material for use, so the regional light-permeable of leaving a blank.
As shown in Figure 3, be the floor map of capacitance type touch key device of the present invention, Fig. 3 is the capacitance type touch key device planar effect picture that is formed by stacking by Fig. 1 and Fig. 2.
The present invention also provides the manufacture method of above-mentioned capacitance type touch key device, and this method is further comprising the steps of:
(a) silk-screen key icon 1 on the part surface of translucent printed circuit board;
(b) touch pad 4 is set around described key icon 1;
(c) ink for screen printing layer 5 on the solder side of described printed circuit board;
(d) on the solder side of described printed circuit board, arrange light source.
Further, key icon 1 described in the step (a) includes key icon background colour 2 and icon 3, before silk-screen, need earlier the icon 3 of 1 li of key icon to be made the negative mode that shows, described icon 3 is a kind of or its combination in any in pattern, font or the symbol, the icon 3 of this example is a pattern, promptly icon 3 is processed into transparently, again this key icon background colour 2 is processed into black.Transfer the monochrome bitmap file then to, import Altium Designer 6.0 again or protel99 software is made key icon 1, after this icon 3 being made the negative mode that shows, through the transmission of light source the time, just can well highlight icon 3.
Further, comprise in the step (b): described touch pad 4 was provided with around described 1 one weeks of key icon, and described touch pad 4 is arranged to and described key icon 1 corresponding shape.Further, in order to guarantee the close contact as much as possible of PCB and touch panel, the part surface of PCB only is provided with and touches pad 4, and the circuit that will touch pad 4 passes hole and be connected to circuit on the PCB solder side, is connected to the detection integrated circuit at last and touches piece.
Further, comprise in the step (c): position relative with described key icon 1 on the solder side of described printed circuit board is provided with the zone of leaving a blank, and on the solder side of printed circuit board except the zone of leaving a blank the above ink laies 5 of silk-screen all, wherein said ink lay 5 is light tight ink lay.
Further, comprise in the step (d): for key icon 1 is evenly shown, this step has adopted the back of the body lamp of side-light type, light source is assemblied on the solder side of PCB, and with this light source be arranged on the PCB part surface on the relative position of key icon 1 of silk-screen, be the described zone of leaving a blank, this light source can be selected LED for use.The light of this light source is injected from the zone of leaving a blank of PCB, and the light during ejaculation is homogenized and the bright excessively phenomenon of district portion can not occur.The region design mode of leaving a blank of PCB can save the film that will adopt that layer silk-screen key icon in the prior art, thereby has further reduced production cost.
The operation principle of capacitance type touch key device of the present invention is as follows:
When the user of this capacitance type touch key device touches key icon 1 relative on this touch panel with hand or other conductors, corresponding touch pad 4 detects this touch signal because of capacity effect, thereby this capacitance type touch key device detects the input of a key command.This button input simultaneously is to drive and this detects the corresponding light source luminescent of touch pad 4 of touching.The light that this light source sends is transmitted to corresponding key icon 1 by the zone of leaving a blank of this translucent PCB, thereby indicates the key-press status of this button.
Prior art is that light source is arranged on the part surface of pcb board, can increase the top layer thickness of pcb plate like this, make the touch pad of PCB top layer increase to the distance of touch panel, cause its capacitance variations drop less, thereby had influence on the detection sensitivity and the stability of capacitance touch key device.The light source of capacitance type touch key device of the present invention then is arranged on the solder side of pcb board, touch pad 4 thereby can only be provided with at the top layer of PCB, touch pad 4 has just reduced to the distance of touch panel like this, therefore its capacitance variations drop is bigger, has improved the detection sensitivity and the stability of capacitance touch key device.And because the capacitance touch key device has adopted this design, can save the film of that layer silk-screen key icon that will use in the design of capacitance touch key device in the prior art, thereby further reduce the cost of capacitance touch key device.
Be used for the method that testing capacitor changes at present, mainly at present adopt two kinds.A kind of principle is to utilize capacitance variations to change frequency of oscillation, realizes measurement to capacitance change by the variation of measuring frequency of oscillation again, thus can be indirect judged whether key command.Alternative principle is to utilize the long more relation of the big more then capacitor charging time of capacitor's capacity, obtains the variable quantity of capacitor's capacity by the variable quantity of measuring capacitor charging time, thereby can judge whether key command indirectly.
What this time experiment was adopted is the 1st kind of method, and this method also relates to the selection of the relevant IC of touch (IC=Integrated Circuit Chinese integrated circuit by name).It is very ripe to touch IC at present, and it is the drop that detects capacitance that touch IC mainly acts on, and learns the instruction whether button is arranged indirectly by the drop of capacitance.This time the CY8P23514 touch IC model of producing with the CYPRESS of american semiconductor company is an example, it be inside integrated the MCU(MCU=Micro Controller Unit of capacitance measurement circuit, Chinese is a micro-control unit), after touching the processing of IC by this, just can be intuitively reflect through the capacitance variations value after the quantification with the form of numerical value or curve.The detection step that touches IC of telling specifically comprises: earlier testing software is burnt to CY8P23514 and touches IC, the output interface that then CY8P23514 is touched IC is by IIC(IIC=Inter Integrated Circuit, Chinese is the twin wire universal serial bus) change into USB(USB=Universal Serial BUS, Chinese is a USB) behind the interface, CY8P23514 is touched IC be connected to PC(PC=Personal Computer, Chinese is a personal computer), just can directly observe current count value by PC at last.That this experiment is used is the PVC(PVC=Poly vinyl chlorid of 3.5 millimeters thick, and Chinese is a polyvinyl chloride) transparent panel.We at first write down the data when not putting prod, its mean value is 4100, after contacting one by one with the prod of standard then, the mean value that writes down it is 4230, so its rate of change P=(4230-4100)/4100=31.7 ‰, and the interference noise value is less than 30, these two numerical value are very desirable, because in actual use, the appearance value variable quantity of electric capacity is very little, be easy to be interfered, disturb as power supply ripple, the strong electromagnetic of the electromagnetic interference of other circuit and peripheral environmental protection on the circuit board, factors such as the fitting tight degree of this outer panels and PCB also can interfere with its numerical value.
So proof after capacitance type touch apparatus of the present invention adopts such design, has improved the detection sensitivity and the stability of capacitance type touch apparatus by experiment.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the device of a capacitance type touch key, comprise translucent printed circuit board, the front of described printed circuit board is a part surface, reverse side is a solder side, the direct silk-screen of part surface that it is characterized in that described printed circuit board has key icon, the part surface of described printed circuit board also is provided with the touch pad, described touch pad be arranged on described key icon around, the solder side of described printed circuit board is provided with light source.
2. according to the device of the described capacitance type touch key of claim 1, it is characterized in that: described light source is arranged on the below of described key icon.
3. according to the device of the described capacitance type touch key of claim 1, it is characterized in that: described touch pad ring distributed around described one week of key icon.
4. according to the device of the described capacitance type touch key of claim 1, it is characterized in that: silk-screen has lighttight ink lay on the solder side of described printed circuit board (PCB), and described ink lay is provided with and the corresponding zone of leaving a blank of described key icon.
5. according to the device of the described capacitance type touch key of claim 1, it is characterized in that: described key icon is a kind of or its combination in any in polygon, square, rhombus, the circle.
6. according to the device of the described capacitance type touch key of claim 5, it is characterized in that: described touch pad is arranged to a kind of or its combination in any in corresponding polygon, square, rhombus, the circle around described key icon.
7. the manufacture method of a capacitance type touch key device is characterized in that, this method may further comprise the steps:
(a) silk-screen key icon on the part surface of translucent printed circuit board;
(b) the touch pad is set around described key icon;
(c) ink for screen printing layer on the solder side of described printed circuit board;
(d) on the solder side of described printed circuit board, arrange light source.
8. according to the manufacture method of the described capacitance type touch key device of claim 7, it is characterized in that, comprise in the described step (b): described touch pad ring was provided with around described one week of key icon, and described touch pad is arranged to and the corresponding shape of described key icon.
9. according to the manufacture method of the described capacitance type touch key device of claim 7, it is characterized in that, comprise in the described step (c): position relative with described key icon on the solder side of described printed circuit board is provided with the zone of leaving a blank, and on the solder side of printed circuit board except the zone of leaving a blank the above printing ink of silk-screen all, wherein said printing ink is light tight printing ink.
10. according to the manufacture method of the described capacitance type touch key device of claim 9, it is characterized in that, comprise in the described step (d): light source is set in the described zone of leaving a blank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106047821A CN102098036A (en) | 2010-12-24 | 2010-12-24 | Capacitive touch key device and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106047821A CN102098036A (en) | 2010-12-24 | 2010-12-24 | Capacitive touch key device and manufacturing method thereof |
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| CN102098036A true CN102098036A (en) | 2011-06-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751971A (en) * | 2012-07-19 | 2012-10-24 | 海芯科技(厦门)有限公司 | Capacitive touch button and design method thereof |
| CN103001624A (en) * | 2011-09-12 | 2013-03-27 | 双叶电子工业株式会社 | Touch switch |
| CN104142764A (en) * | 2013-05-07 | 2014-11-12 | 贵州达沃斯光电有限公司 | Method for manufacturing capacitive touch screen |
| CN110794995A (en) * | 2018-08-02 | 2020-02-14 | 比亚迪股份有限公司 | Capacitive key display panel, method and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201150053Y (en) * | 2007-10-29 | 2008-11-12 | 深圳和而泰智能控制股份有限公司 | Capacitance induction type touch screen |
| CN101556520A (en) * | 2009-05-19 | 2009-10-14 | 深圳和而泰智能控制股份有限公司 | Touch button device |
| CN201514734U (en) * | 2009-07-17 | 2010-06-23 | 珠海格力电器股份有限公司 | Display device |
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2010
- 2010-12-24 CN CN2010106047821A patent/CN102098036A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201150053Y (en) * | 2007-10-29 | 2008-11-12 | 深圳和而泰智能控制股份有限公司 | Capacitance induction type touch screen |
| CN101556520A (en) * | 2009-05-19 | 2009-10-14 | 深圳和而泰智能控制股份有限公司 | Touch button device |
| CN201514734U (en) * | 2009-07-17 | 2010-06-23 | 珠海格力电器股份有限公司 | Display device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001624A (en) * | 2011-09-12 | 2013-03-27 | 双叶电子工业株式会社 | Touch switch |
| CN102751971A (en) * | 2012-07-19 | 2012-10-24 | 海芯科技(厦门)有限公司 | Capacitive touch button and design method thereof |
| CN104142764A (en) * | 2013-05-07 | 2014-11-12 | 贵州达沃斯光电有限公司 | Method for manufacturing capacitive touch screen |
| CN110794995A (en) * | 2018-08-02 | 2020-02-14 | 比亚迪股份有限公司 | Capacitive key display panel, method and electronic equipment |
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Application publication date: 20110615 |