CN209433386U - Anti-interference infrared touch panel - Google Patents
Anti-interference infrared touch panel Download PDFInfo
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- CN209433386U CN209433386U CN201920415049.1U CN201920415049U CN209433386U CN 209433386 U CN209433386 U CN 209433386U CN 201920415049 U CN201920415049 U CN 201920415049U CN 209433386 U CN209433386 U CN 209433386U
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Abstract
The utility model relates to touch screen technology fields, the utility model aims to solve the problem that existing infrared touch panel be easy to cause the problem of touching failure under strong light environment, it is proposed a kind of anti-interference infrared touch panel, including infrared transmission module and infrared receiving module, infrared receiving module includes analog-to-digital conversion module and control module, infrared receiving module further include: amplifier circuit and isolation circuit, amplifier circuit can acquire the infrared signal and ambient light signal of infrared transmission module transmitting, the output end of amplifier circuit is connected by the input terminal of the isolation circuit and analog-to-digital conversion module.After the infrared signal and ambient light signal that amplifier circuit emits infrared transmission module are sampled amplification, ambient light signal is isolated from the infrared signal that infrared transmission module emits by isolation circuit, the failure for avoiding the infrared touch panel under strong light environment, suitable for the electronic equipment with infrared touch panel.
Description
Technical field
The utility model relates to touch screen technology fields, relate in particular to a kind of infrared touch panel.
Background technique
Infrared touch panel is a kind of touch device for emitting and blocking principle using infrared ray, it includes one group of high-precision
Infrared transmitting tube and one group of infrared receiving tube, intersection are mounted on two opposite directions, form a sightless infrared ray
Grid.When touching object such as finger etc. enters grating, light beam is just blocked, intelligence control system will investigate the loss of light beam
Variation, and transmission of control signals is to control system, to confirm X-axis and Y axis coordinate value, to judge touch point in the position of screen
It sets.
But infrared touch panel is because the received infrared light of its infrared receiving tube is widespread in nature, be easy by
Error detection is generated to the infrared light that external object issues.In traditional technology using on infrared receiving tube cover shading layer or
Beam-forming pipeline is set in infrared transmitting tube to stop external environmental light, although a degree of can prevent under low light environment
The only interference of external environmental light, still, when extraneous ambient lighting is strong, because infrared luminous intensity is larger, traditional approach still holds
Easily cause touch failure.
Utility model content
The utility model aims to solve the problem that existing infrared touch panel is be easy to cause under strong light environment and touches asking for failure
Topic, proposes a kind of anti-interference infrared touch panel.
The utility model solves technical solution used by above-mentioned technical problem: anti-interference infrared touch panel, including
Infrared transmission module and infrared receiving module, the infrared receiving module include analog-to-digital conversion module and control module, the mould
The output end of number conversion module is connected with the signal acquisition terminal of control module, the infrared receiving module further include: amplifier
Circuit and isolation circuit, the amplifier circuit can acquire the infrared signal and environment light letter of infrared transmission module transmitting
Number, the output end of amplifier circuit is connected by the input terminal of the isolation circuit and analog-to-digital conversion module.
It further, is the sampling and amplification of realizing infrared light and ambient light signal, the amplifier circuit includes: light
Quick diode, triode, first resistor and second resistance, the cathode of the photodiode and the first power input port connect
It connects, the anode of photodiode is connect with the base stage of triode, and first resistor is in parallel with photodiode, the collector of triode
It is connect with second source input port, the emitter of triode is connect with isolation circuit, and the base stage of triode also passes through described
Two resistance eutral groundings.
Further, to realize the isolation to ambient light signal, the isolation circuit includes capacitor, the hair of the triode
Emitter-base bandgap grading is connected by the input terminal of the capacitor and analog-to-digital conversion module.
Further, it is adjusted for the amplitude to output signal, the infrared receiving module further include: shaping amplification electricity
Road and gain adjusting circuit, the isolation circuit are connected by the input terminal of the shaping amplification circuit and analog-to-digital conversion module,
The feedback output end of the control module is connect with gain adjusting circuit, and the gain adjusting circuit and shaping amplification circuit connect
It connects.
The beneficial effects of the utility model are: anti-interference infrared touch panel described in the utility model, amplifier electricity
After the infrared signal and ambient light signal that road emits infrared transmission module are sampled amplification, by isolation circuit by environment light
Signal is isolated from the infrared signal that infrared transmission module emits, and only retains the infrared signal of infrared transmission module transmitting, thus
Interference of the external environmental light to judging result is avoided, the failure of the infrared touch panel under strong light environment is avoided, improves
The reliability of infrared touch panel.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of anti-interference infrared touch panel described in the utility model embodiment；
Fig. 2 is another structural schematic diagram of anti-interference infrared touch panel described in the utility model embodiment；
Description of symbols:
R1- first resistor；R2- second resistance；C- capacitor；D- photodiode；The first power input port of VCC1-；
VCC2- second source input port.
Specific embodiment
The embodiments of the present invention is described in detail below in conjunction with attached drawing.
Anti-interference infrared touch panel described in the utility model, including infrared transmission module and infrared receiving module, institute
Stating infrared receiving module includes analog-to-digital conversion module and control module, the output end of the analog-to-digital conversion module and control module
Signal acquisition terminal connection, the infrared receiving module further include: amplifier circuit and isolation circuit, the amplifier circuit
The infrared signal and ambient light signal of infrared transmission module transmitting can be acquired, the output end of amplifier circuit passes through described
The connection of the input terminal of isolation circuit and analog-to-digital conversion module.
Amplifier circuit acquires infrared transmission module transmitting infrared signal and external environment optical signal, passes through isolation
Circuit converts analog signals into digital signal by analog-to-digital conversion module, and be input to control for after external environment optical signal isolation
Molding block, control module carry out identification judgement to digital signal corresponding to infrared transmission module transmitting infrared signal, judge
Out the position of touch point and send it to rear end control equipment controlled accordingly.
Embodiment
Anti-interference infrared touch panel described in the utility model embodiment, as shown in Figure 1, include infrared transmission module and
Infrared receiving module, the infrared receiving module include analog-to-digital conversion module and control module, the analog-to-digital conversion module it is defeated
Outlet is connected with the signal acquisition terminal of control module, the infrared receiving module further include: amplifier circuit and isolation circuit,
The amplifier circuit can acquire the infrared signal and ambient light signal of infrared transmission module transmitting, amplifier circuit
Output end pass through the input terminal of the isolation circuit and analog-to-digital conversion module connect.
Wherein, infrared transmission module can be multiple infrared emission tubes or multiple infrared emission tube groups, infrared to connect
Receiving module can be infrared receiver tube corresponding with infrared emission tube quantity, or corresponding with infrared emission tube group quantity
Infrared receiver tube group, analog-to-digital conversion module can be A/D converter for converting analog signals into digital signal, controls
Molding block includes signal acquisition port, and the infrared signal after isolation environment optical signal is input to the signal acquisition terminal of control module
Mouthful, control module can be microprocessor, central processing unit or other control modules with processing capacity and operational capability.
Optionally, as shown in Fig. 2, the amplifier circuit includes: photodiode D, triode V, first resistor R1
With second resistance R2, the cathode of the photodiode D is connect with the first power input port VCC1, and photodiode D is just
Pole is connect with the base stage of triode V, and first resistor R1 is in parallel with photodiode D, and the collector and second source of triode V is defeated
Inbound port VCC2 connection, the emitter of triode V are connect with isolation circuit, and the base stage of triode V also passes through the second resistance
R2 ground connection.
Wherein, photodiode D includes the infrared signal that infrared transmission module is sent for acquiring optical signal, optical signal
And external environment optical signal, first resistor is for dividing, and second resistance is sample resistance, the infrared light comprising ambient light signal
Signal is inputted from the base stage of triode, is exported after triode amplifies by emitter-base bandgap grading, and emitter follower is formed, in this way can be significantly
Sample resistance, that is, second resistance resistance value is reduced, to ensure under strong light environment, the voltage of second resistance will not be saturated, Bu Huizao
The infrared signal disappearance sent at infrared transmission module leads to the problem of touching failure.
Optionally, as shown in Fig. 2, the isolation circuit includes capacitor C, the emitter of the triode V passes through the electricity
The input terminal for holding C and analog-to-digital conversion module connects.
It is understood that intensity of illumination is constant whithin a period of time for external environmental light, can be approximately considered is direct current signal,
However the infrared signal that infrared transmission module is sent is pulse signal, belongs to AC signal, it therefore, can will be straight by capacitor
The ambient light signal isolation for flowing signal only retains the infrared signal that infrared transmission module is sent and is input to analog-to-digital conversion module.
Optionally, as shown in Figure 1, the infrared receiving module further include: shaping amplification circuit and gain adjusting circuit, institute
It states isolation circuit to connect by the input terminal of the shaping amplification circuit and analog-to-digital conversion module, the feedback of the control module is defeated
Outlet is connect with gain adjusting circuit, and the gain adjusting circuit is connect with shaping amplification circuit.
It is understood that shaping amplification circuit is used to carry out the infrared signal that the infrared transmission module of input is sent
Shaping and amplification are specifically exactly the adjustment and amplification for carrying out amplitude, and gain adjusting circuit according to control module for sending
Feedback signal adjust shaping amplification circuit amplification factor, and then make output signal amplitude size it is essentially the same, wherein it is whole
Shape amplifying circuit and gain adjusting circuit belong to the prior art, and details are not described herein again.
Claims (4)
1. anti-interference infrared touch panel, including infrared transmission module and infrared receiving module, the infrared receiving module include
Analog-to-digital conversion module and control module, the output end of the analog-to-digital conversion module are connected with the signal acquisition terminal of control module,
It is characterized in that, the infrared receiving module further include: amplifier circuit and isolation circuit, the amplifier circuit can be adopted
Collect the infrared signal and ambient light signal of infrared transmission module transmitting, the output end of amplifier circuit passes through the isolation electricity
The connection of the input terminal of road and analog-to-digital conversion module.
2. anti-interference infrared touch panel as described in claim 1, which is characterized in that the amplifier circuit includes: light
Quick diode, triode, first resistor and second resistance, the cathode of the photodiode and the first power input port connect
It connects, the anode of photodiode is connect with the base stage of triode, and first resistor is in parallel with photodiode, the collector of triode
It is connect with second source input port, the emitter of triode is connect with isolation circuit, and the base stage of triode also passes through described
Two resistance eutral groundings.
3. anti-interference infrared touch panel as claimed in claim 2, which is characterized in that the isolation circuit includes capacitor, institute
The emitter for stating triode is connected by the input terminal of the capacitor and analog-to-digital conversion module.
4. anti-interference infrared touch panel as described in claim 1, which is characterized in that the infrared receiving module further include:
Shaping amplification circuit and gain adjusting circuit, the isolation circuit are defeated by the shaping amplification circuit and analog-to-digital conversion module
Enter end connection, the feedback output end of the control module is connect with gain adjusting circuit, and the gain adjusting circuit is put with shaping
Big circuit connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415049.1U CN209433386U (en) | 2019-03-28 | 2019-03-28 | Anti-interference infrared touch panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415049.1U CN209433386U (en) | 2019-03-28 | 2019-03-28 | Anti-interference infrared touch panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209433386U true CN209433386U (en) | 2019-09-24 |
Family
ID=67978937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920415049.1U Active CN209433386U (en) | 2019-03-28 | 2019-03-28 | Anti-interference infrared touch panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209433386U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111510112A (en) * | 2020-04-26 | 2020-08-07 | 南京理工大学 | Optical pulse receiving circuit capable of resisting strong light interference |
| CN116719438A (en) * | 2022-09-13 | 2023-09-08 | 广州众远智慧科技有限公司 | Infrared touch device and electronic device |
-
2019
- 2019-03-28 CN CN201920415049.1U patent/CN209433386U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111510112A (en) * | 2020-04-26 | 2020-08-07 | 南京理工大学 | Optical pulse receiving circuit capable of resisting strong light interference |
| CN116719438A (en) * | 2022-09-13 | 2023-09-08 | 广州众远智慧科技有限公司 | Infrared touch device and electronic device |
| CN116719438B (en) * | 2022-09-13 | 2024-06-11 | 广州众远智慧科技有限公司 | Infrared touch device and electronic device |
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