CN102789341A - Infrared laser touch device and touch detection method - Google Patents
Infrared laser touch device and touch detection method Download PDFInfo
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- CN102789341A CN102789341A CN2012102522505A CN201210252250A CN102789341A CN 102789341 A CN102789341 A CN 102789341A CN 2012102522505 A CN2012102522505 A CN 2012102522505A CN 201210252250 A CN201210252250 A CN 201210252250A CN 102789341 A CN102789341 A CN 102789341A
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Abstract
The invention is applied to the technical field of touch control, and provides an infrared laser touch device and a touch detection method. The device includes a touch panel, wherein a rectangular frame is arranged on the periphery of the touch panel; a rotary reflecting mirror is arranged at each of the adjacent turnings of the frame respectively; two infrared lasers in one-to-one correspondence with the rotary reflecting mirrors and used for emitting infrared light to the rotary reflecting mirrors are arranged between the two rotary reflecting mirrors; the rotary reflecting mirrors take the shapes of regular octagons and axially rotate, so that reflected infrared light can be used for scanning the touch panel in a swinging manner; and infrared receiving tube arrays are arranged on the three edges of the frame, without any infrared laser. According to the invention, the two infrared lasers and the rotary reflecting mirrors substitute the infrared transmitting tubes in the traditional touch screen, thereby reducing the infrared transmitting tubes and further saving the cost on the one hand, and simplifying the structural and circuit design and having high anti-interference performance on the other hand, meanwhile, the response speed is greatly improved through the quick inclined scanning in virtue of the rotation of the rotary reflecting mirror.
Description
Technical field
The invention belongs to touch induction technical field, relate in particular to a kind of infrared laser touching device and touch detecting method.
Background technology
Existing infrared touch technology is installed infrared LED power valve and infrared receiving tube mostly around touch panel; LED power valve and receiving tube are formed infrared emission and receiving array according to mapping relations one to one; Through judging that whether the infrared beam between infrared LED power valve and the infrared receiving tube is blocked, and judges whether to take place touch event.There is following technological deficiency in this infrared touch panel: at first, need to use a large amount of infrared transmitting tube and infrared receiving tube, and need complicated infrared absorption filter wave circuit, along with the increase of size, production cost is increasingly high, and poor anti jamming capability; In addition, if or multiple point touching take place simultaneously, be difficult to distinguish fast real touch point at 2.The few infrared laser light source that adopts of existing infrared touch technology, because the angle of divergence of LASER Light Source is too small, laser irradiation area is too small, the infrared transmitting tube that needs and the quantity of receiving tube are also more.There is a kind of infrared touch panel that adopts infrared laser light source and be provided with catoptron at present; Being positioned at the infrared light that the infrared laser power valve of touch-screen one side sends is received by infrared receiving tube through after the plane reflection mirror reflection of offside; Through judging that whether infrared receiving tube is blocked, and judges whether to take place touch event.Because the angle of divergence of infrared laser is very little, adopt the common planar catoptron also can only cover less zone, this touch-screen still needs a large amount of infrared laser power valve and receiving tube, and cost is still higher.In addition, above-mentioned traditional infrared touch panel majority is to come detected touch point through lighting power valve one by one and scanning receiving tube, makes that the reaction velocity of traditional infrared touch panel is slower.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of infrared laser touching device, is intended to solve traditional infrared touch-screen cost height, poor anti jamming capability and the slow problem of response speed.
The embodiment of the invention is to realize like this; A kind of infrared laser touching device; Comprise touch panel; Be provided with the frame of a rectangle around the said touch panel, respectively be provided with a rotating mirror two of said frame adjacent corners, between two rotating mirrors, be provided with two corresponding one by one with said rotating mirror and launch the infrared laser of infrared light towards said rotating mirror;
But said rotating mirror is octagon and axial rotation, makes the infrared light that is reflected carry out oscillatory scanning to said touch panel;
Be not provided with at said frame on three limits of said infrared laser and be provided with the infrared receiving tube array.
Another purpose of the embodiment of the invention is to provide a kind of electronic touch equipment, comprises described infrared laser touching device.
Another purpose of the embodiment of the invention is to provide a kind of and adopts described infrared laser touching device to touch the method for detection, comprises the steps:
A, through two groups of infrared lasers and rotating mirror to the touch panel oscillatory scanning that hockets; And in each scanning process, infrared receiving tube is detected; Confirm and infrared receiving tube that record is blocked, and the angle of the line between the infrared laser beam of confirming to be blocked according to the said infrared receiving tube that is blocked and two rotating mirrors;
B, confirm touch point position according to said angle.
The infrared laser touching device that the embodiment of the invention provides reflects infrared laser through the rotating mirror of octagon; Make folded light beam carry out swinging type scanning through its high speed rotating to touch panel; Adopt two infrared lasers and two rotating mirrors to replace a large amount of infrared transmitting tube or laser instruments that adopt in the conventional touch screen; On the one hand, practice thrift the consumption of infrared transmitting tube or laser instrument in a large number, significantly practiced thrift cost; On the other hand, structure and circuit design are simple, compare with the structure of a large amount of infrared transmitting tubes of Traditional use, are convenient to make and strong interference immunity; On the one hand, tiltedly sweep fast through the rotation of rotating mirror, compare with traditional scan mode of lighting power valve one by one, response speed is accelerated greatly, makes to make operation smooth more by corresponding electronic device recognizing touch operation point faster.
Description of drawings
Fig. 1 is the structural representation of the infrared laser touching device that provides of first embodiment of the invention;
Fig. 2 is the fundamental diagram of the infrared laser touching device that provides of first embodiment of the invention;
Fig. 3 is the partial structurtes synoptic diagram of the infrared laser touching device that provides of first embodiment of the invention;
Fig. 4 is the process flow diagram of the touch detecting method that provides of second embodiment of the invention;
Fig. 5 is that the single-point touches of the touch detecting method that provides of second embodiment of the invention detects schematic diagram;
Fig. 6 is that the multiple point touching of the touch detecting method that provides of second embodiment of the invention detects schematic diagram.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention 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 present invention, and be not used in qualification the present invention.
Below in conjunction with specific embodiment concrete realization of the present invention is described in detail:
Embodiment one:
Fig. 1 shows the structural representation of the infrared laser touching device that first embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with present embodiment.
This infrared laser touching device comprises touch panel 101; Around touch panel 101, be provided with the frame 102 of a rectangle; Respectively be provided with a rotating mirror two of frame adjacent corners; I.e. first rotating mirror 103 and second rotating mirror 104, these two rotating mirrors are preferably disposed on the two ends of the horizontal top of frame 102, can certainly be arranged at the two ends of left side or right edge; The two ends that the level that can also be arranged at is following, following content all describe to the situation that rotating mirror is arranged at the horizontal top of frame 102.Between first, second rotating mirror, be provided with two infrared lasers, i.e. first infrared laser 105, second infrared laser 106.These two infrared lasers are in same horizontal level and towards on the contrary, first infrared laser 105 is towards first rotating mirror, 103 emission infrared lights, and second infrared laser 106 is towards second rotating mirror, 104 emission infrared lights.First, second rotating mirror is an octagon, and can make the infrared light that is rotated mirror reflects in 0～90 ° of scope, to swing, to scan whole touch panel 101 around the central shaft high speed rotating of himself.Three limits of other of this frame 102 are provided with infrared receiving tube 107, are used to receive the scan light signal.
With reference to accompanying drawing 2, the principle of work of this infrared laser touching device is: in first period, first infrared laser 105 is to first rotating mirror, 103 emission infrared lights; First rotating mirror 103 is axial high speed rotating under the driving action of external force; Change the catoptrical direction of propagation fast, reflected light is swung in 0～90 ° scope to scan whole touch panel 101, in the process of scanning; Infrared beam can touched point be blocked when inswept touch point; Can't be received by corresponding infrared receiving tube 107, then can not be blocked in other zones, corresponding infrared receiving tube 107 can not be blocked yet.In the process of scanning; To detect infrared receiving tube 107; Judge according to detected value whether corresponding infrared receiving tube is blocked; If judge that corresponding infrared receiving tube 107 is blocked, prove that then the touch point is positioned on the line of this infrared receiving tube 107 and first rotating mirror 103, write down this infrared receiving tube 107 this moment.And calculate the infrared beam that is blocked and the angle of horizontal direction according to this infrared receiving tube 107.
In second period; Second infrared laser 106 is to second rotating mirror, 104 emission infrared lights, and with the above, second rotating mirror, 104 axial high speeds rotate; Make the whole touch panel 101 of reflected-light scanning; In the process of scanning, detect the infrared receiving tube 107 that record also is blocked, and calculate the infrared beam that is blocked and the angle of horizontal direction according to this infrared receiving tube 107.
Further, can confirm touch point position according to above-mentioned angle, concrete processing procedure will be set forth in subsequent content in detail.
The infrared laser touching device that the embodiment of the invention provides reflects infrared laser through the rotating mirror of octagon; Make folded light beam carry out swinging type scanning through its high speed rotating to touch panel; Adopt two infrared lasers and two rotating mirrors to replace a large amount of infrared transmitting tube or laser instruments that adopt in the conventional touch screen; On the one hand, practice thrift the consumption of infrared transmitting tube or laser instrument in a large number, significantly practiced thrift cost; On the other hand, structure and circuit design are simple, compare with the structure of a large amount of infrared transmitting tubes of Traditional use, are convenient to make and strong interference immunity, and have reduced the probability that damages, and are convenient to the maintenance in later stage simultaneously; On the one hand, tiltedly sweep fast through the rotation of rotating mirror, compare with traditional scan mode of lighting power valve one by one, response speed is accelerated greatly, makes to make operation smooth more by corresponding electronic device recognizing touch operation point faster.
Be appreciated that; First rotating mirror 103 in the present embodiment and the minute surface and its central axes of second rotating mirror 104; Its central shaft then with the Surface Vertical of touch panel 101, scan to guarantee the surface that reflection ray can be parallel to touch panel 101.
In embodiments of the present invention, in order to guarantee in 0～90 ° of scope, to swing just after infrared laser that infrared laser sends is rotated mirror reflects, can be provided with according to the position of following mode to infrared laser.Like Fig. 3, be example with first infrared laser 105, when any two parallel opposite side of first rotating mirror 103 are in level; Adjust the position of first infrared laser 105; The lucky level of the infrared laser that it is sent is got to the A place, summit of first rotating mirror 103, at this moment, and when first rotating mirror 103 clockwise rotates; The lower end of infrared laser L1 from the limit is swept to the upper end; Reflection angle increases to 45 ° gradually from 0 °, and catoptrical direction changes to perpendicular to horizontal direction from being parallel to horizontal direction, and whole touch panel 101 is scanned.Along with being rotated further of first rotating mirror 103; The upper end of the point of irradiation of infrared laser L1 from the limit jumps to the lower end of limit L2; Catoptrical direction is suddenlyd change to horizontal direction from vertical direction, continues according to clockwise scanning direction touch panel 101, and the rest may be inferred.Certainly, can there be certain error in the position of first infrared laser 105 based on above design, and error range is as the criterion not influence practical application.The Position Design principle of second infrared laser 106 is the same.
In embodiments of the present invention; Can respectively establish a collimating optical system 108 between first infrared laser 105 and first rotating mirror 103 and between second infrared laser 106 and second rotating mirror 104; The infrared laser beam that corresponding infrared laser is sent collimates the back to the rotating mirror output of correspondence, to guarantee the collimation of scanning light beam.
Be appreciated that; The embodiment of the invention is primarily aimed at the situation that first, second rotating mirror is in horizontal top and describes, and this structural design is merely preferred version of the present invention for the ease of explanation; The present invention is not limited to the horizontal top that first, second rotating mirror is in frame; When it was in level bottom, left side or right edge, above-mentioned structural design mode and principle of work were suitable equally, and its technique effect is also with the above.
Further, first, second rotating mirror can be rotated by the brush DC drive motor drives.Further, present embodiment can rotate through this brush DC drive motor of controller control, and then the driven in rotation catoptron rotates.This controller also can be used for controlling the duty of infrared laser, and the control infrared receiving tube receives sweep signal, and touch point etc. is handled and finally located to the signal that infrared receiving tube receives.
Further, can be through the touch point information that this controller is confirmed through the output of corresponding communication interface, communication interface can comprise interfaces such as RS232, RS485, SPI, USB.
The touching device that the embodiment of the invention provides has improved the anti-interference and the response speed of device with succinct structural design; Greatly reduce cost simultaneously; Be suitable in the various electronic touch equipment, like TV, panel computer, ATM, electronic whiteboard, jukebox or the like.
Embodiment two:
The above-mentioned infrared laser touching device of employing that Fig. 4 shows second embodiment of the invention to be provided touches the method for detection.This method specifically may further comprise the steps:
In step S201; Through two groups of infrared lasers and rotating mirror to the touch panel oscillatory scanning that hockets; In each scanning process, infrared receiving tube is detected; Confirm and infrared receiving tube that record is blocked, and the angle of the line between the infrared laser beam of confirming to be blocked according to the said infrared receiving tube that is blocked and two rotating mirrors;
In step S202, confirm touch point position according to said angle.
In embodiments of the present invention, can be alternately luminous through first, second infrared laser of controller control, incide first, second rotating mirror through colimated light system then, through the rotation realization oscillatory scanning of rotating mirror.In the process of each scanning, through controller infrared receiving tube is detected in real time, the content of its detection is designed by the technician in advance; Detect content setting one preset threshold value to it simultaneously; In the touch testing process of reality, detected value and its initial value in the initialization array of infrared receiving tube compared, if the difference of the two surpasses pre-set threshold; Then be judged as the touch point and blocked, write down the infrared receiving tube that this is blocked.And calculate the laser beam that is blocked and the angle of the line between first, second rotating mirror through this infrared receiving tube; Because first, second rotating mirror preferably is located at the two ends of the horizontal top of frame, this moment, this angle also was the laser beam that is blocked and the angle of horizontal direction.
Further combine accompanying drawing 5; When the touch point was single-point P, the infrared laser beam that reflects through first rotating mirror 103 scanned touch panel 101, and can calculate the angle of infrared laser beam L11 and horizontal direction this moment according to the infrared receiving tube that is blocked 107; Infrared laser beam through 104 reflections of second rotating mirror scans touch panel 101 then; Calculate the angle β of infrared laser beam L21 and horizontal direction, this angle and β can uniquely confirm that the distance of known two rotating mirrors is D; Can through following relational expression calculate position coordinates (x, y):
x=y/tanα；y=(Dtanαtanβ)/(tanα+tanβ)；
Through above-mentioned expression formula can unique definite touch point P the position (x, y).
Further combine accompanying drawing 6; When the touch point is multiple spot (is example with 2); When the infrared laser beam through 103 reflections of first rotating mirror scans touch panel 101; Can calculate two angles of infrared laser beam L12, L13 and horizontal direction according to the infrared receiving tube that is blocked 107, the infrared laser beam through 104 reflections of second rotating mirror scans touch panel 101 then, calculates two angles of infrared laser beam L22, L23 and horizontal direction.Through calculate can obtain two groups of data (x0, x1) with (y0, y1), these two groups of data can be formed four touch points to be determined, promptly P0 (x0, y0), P1 (x1, y1), P2 (x0, y1) and P3 (x1, y0).Then; According to the data of the infrared receiving tube 107 that detects in advance, the detected value of inquiry and above-mentioned four corresponding infrared receiving tubes 107 of coordinate points can confirm easily that the pairing infrared receiving tube 107 of scanning light beam at some P2 place was not blocked; In like manner; Can confirm that also a pairing infrared receiving tube 107 of scanning light beam at P3 place was not blocked yet, thereby can weed out false some P2 and P3, keep true some P0 and P1.The embodiment of the invention just is being based on the principle that swing laser is tiltedly swept, and just can discharge false point fast, realizes that multiple point touching detects fast.
The detection method that the embodiment of the invention provides is compared with classic method; Because being the infrared laser swing, its scan mode tiltedly sweeps; Improve response speed greatly, improved antijamming capability, and then improved detection efficiency and precision; Realize more easily that than classic method multiple spot detects, and makes operation smooth and easy more flexibly simultaneously.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. infrared laser touching device; Comprise touch panel; Be provided with the frame of a rectangle around the said touch panel; It is characterized in that, respectively be provided with a rotating mirror two of said frame adjacent corners, between two rotating mirrors, be provided with two corresponding one by one with said rotating mirror and towards the infrared laser of said rotating mirror emission infrared light;
But said rotating mirror is octagon and axial rotation, makes the infrared light that is reflected carry out oscillatory scanning to said touch panel;
Be not provided with at said frame on three limits of said infrared laser and be provided with the infrared receiving tube array.
2. infrared laser touching device as claimed in claim 1 is characterized in that, between said infrared laser and corresponding rotating mirror, is provided with collimating optical system.
3. infrared laser touching device as claimed in claim 1 is characterized in that, also comprises the brush DC drive motor that is used to drive said rotating mirror axial rotation.
4. infrared laser touching device as claimed in claim 3 is characterized in that, also comprises being used to control that said brush DC drive motor rotation, the said infrared laser of control are luminous, the control infrared receiving tube receives signal and locate the controller of touch point.
5. infrared laser touching device as claimed in claim 1 is characterized in that, also comprises the communication interface that is used for to external unit output touch point information.
6. an electronic touch equipment is characterized in that, comprises each described infrared laser touching device of claim 1～5.
7. adopt each described infrared laser touching device of claim 1 to 5 to touch the method for detection, it is characterized in that, comprise the steps:
A, through two groups of infrared lasers and rotating mirror to the touch panel oscillatory scanning that hockets; And in each scanning process, infrared receiving tube is detected; Confirm and infrared receiving tube that record is blocked, and the angle of the line between the infrared laser beam of confirming to be blocked according to the said infrared receiving tube that is blocked and two rotating mirrors;
B, confirm touch point position according to said angle.
8. method as claimed in claim 7 is characterized in that, in said steps A, the method definite and infrared receiving tube that record is blocked is:
When the difference of the detected value of infrared receiving tube and initial value during, confirm that corresponding infrared receiving tube is blocked, and write down said infrared receiving tube greater than preset threshold value.
9. like claim 7 or 8 described methods, it is characterized in that when said touch point was single-point, in said steps A, the said angle of in each scanning process, confirming had and only have one;
Said step B is specially:
Obtain a position coordinates according to said angle and preset algorithm, confirm that said position coordinates is said touch point position coordinate.
10. like claim 7 or 8 described methods, it is characterized in that when said touch point was multiple spot, in said steps A, the said angle of in each scanning process, confirming had a plurality of;
Said step B is specially:
Obtain a plurality of touch points to be determined according to said a plurality of angles and preset algorithm;
Judge whether the corresponding infrared receiving tube in each touch point to be determined is blocked, and is then to confirm as real touch point, get rid of otherwise confirm as false point.
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| CN201210252250.5A CN102789341B (en) | 2012-07-20 | 2012-07-20 | Infrared laser touch device and touch detection method |
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Cited By (4)
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| CN105955551A (en) * | 2016-04-28 | 2016-09-21 | 深圳市创维群欣安防科技股份有限公司 | Infrared touch screen scanning method and device |
| CN107526482A (en) * | 2017-06-15 | 2017-12-29 | 北京仁光科技有限公司 | The system for controlling the touch-control of screen display content movement/switching |
| CN108917189A (en) * | 2018-07-27 | 2018-11-30 | 东莞市联洲知识产权运营管理有限公司 | A kind of wall-mounted Digiplex on intelligent water heater |
| CN109240535A (en) * | 2018-08-14 | 2019-01-18 | 成都吉锐时代触摸技术有限公司 | A kind of touch detecting method based on laser signal |
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| CN109240535A (en) * | 2018-08-14 | 2019-01-18 | 成都吉锐时代触摸技术有限公司 | A kind of touch detecting method based on laser signal |
| CN109240535B (en) * | 2018-08-14 | 2022-01-18 | 成都吉锐时代触摸技术有限公司 | Touch detection method based on laser signals |
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Denomination of invention: Infrared laser touch device and touch detection method Effective date of registration: 20210721 Granted publication date: 20150624 Pledgee: Shenzhen hi tech investment small loan Co.,Ltd. Pledgor: SKYWORTH OPTICAL-ELECTRONIC Co.,Ltd. Registration number: Y2021980006513 |
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