CN102799315B - Infrared touch screen accurate erasing system - Google Patents
Infrared touch screen accurate erasing system Download PDFInfo
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- CN102799315B CN102799315B CN201110135005.1A CN201110135005A CN102799315B CN 102799315 B CN102799315 B CN 102799315B CN 201110135005 A CN201110135005 A CN 201110135005A CN 102799315 B CN102799315 B CN 102799315B
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Abstract
The present invention relates to electronic devices, and particularly to a touch screen. The infrared touch screen accurate erasing system comprises an infrared touch screen main body, wherein the infrared touch screen main body comprises a touch pad, a touch position detection device and a micro processor system, the touch position detection device comprises two groups of infrared transmitting arrays consisting of infrared transmitting tubes and two groups of infrared receiving arrays consisting of infrared receiving tubes, and the infrared touch screen accurate erasing system further comprises an eraser main body, the eraser main body is rectangular, the infrared transmitting devices are arranged at two corners of each edge of the eraser main body, infrared light beams transmitted by the two infrared transmitting devices on each edge of the eraser main body are parallel to each other and are perpendicular to the edge where the two infrared transmitting devices are located. By adopting the technical scheme, the invention can erase the information written in the touch screen in time, realizes the erasing function of the touch screen, and has simple structure and low cost.
Description
Technical field
The present invention relates to electronic equipment, particularly relate to a kind of touch screen.
Background technology
Growing along with multimedia technology, touch-screen applications is more and more extensive, as telecommunication bureau, bank,
The information inquiry in street corner, city, Industry Control, multimedia teaching etc..Touch screen has sturdy and durable, anti-
Answer that speed is fast, save space, be prone to the advantages such as exchange.Utilize this technology, as long as user is with touching
Part touches the picture and text on display screen lightly or uses felt pen write relevant information, can be achieved with human-machine operation,
So that man-machine interaction is the most simple and direct, greatly facilitate user.
Existing touch screen is generally made up of touch detection part and touch screen controller, touches detection part
Being arranged on indicator screen front, be used for detecting user touch location, user uses and touches part touch
After display screen, touch detection part and touch point detected, transmit a signal to touch screen controller, by touching
Touch screen controller and touch point is converted into contact coordinate, carry out subsequent operation.But existing touch screen exists
When using felt pen write relevant information, there is no a kind of timely instrument to write information erasing, the day of one's doom
Make the use of touch screen.
Summary of the invention
It is an object of the invention to provide a kind of accurate erasing system for infrared touch screens, to solve above-mentioned technology
Problem.
Technical problem solved by the invention can realize by the following technical solutions:
Accurate erasing system for infrared touch screens, including an infrared touch panel main body, described infrared touch panel master
Body includes a touch pad, a touch location detection device, a microprocessor system, described touch location
Detection device includes two groups of infrared emission arrays being made up of infrared transmitting tube, two groups by infrared receiving tube group
The infrared receiver array become, also includes a blackboard eraser main body, and described blackboard eraser main body is rectangular, described blackboard eraser master
The length of side of body adjacent two edges is respectively L1, L2, and two edges of each edge of described blackboard eraser main body are equal
Being provided with an infrared launcher, two described infrared launchers in each edge of described blackboard eraser main body are sent out
The infrared light beam penetrated is parallel to each other, and vertical with the limit at two described infrared launcher places；
Infrared receiving tube in described infrared receiver array receives the infrared ray that described infrared launcher is launched
Light beam, described microprocessor system obtains the infrared receiving tube coordinate receiving infrared light beam, and root
According to the described blackboard eraser size of main body inputted, by triangular relationship computing, first calculate described blackboard eraser
One angle of main body positional information on described touch pad；
Calculate four angles of described blackboard eraser main body positional information on described touch pad the most further,
And then determining the described blackboard eraser main body band of position on a touchpad, described microprocessor system is by blackboard eraser
The information that main body is write at touchpad position region is wiped, it is achieved described infrared touch panel main body
Erasing function.
The present invention uses above-mentioned design, and blackboard eraser main body can accurately wipe the information of write on touchpad,
And the simple in construction of realization, low cost, can well be applied in infrared touch panel main body.
Described microprocessor system controls the described infrared receiving tube in described infrared receiver array and opens,
And the infrared transmitting tube controlled in described infrared emission array lights one by one.
During described blackboard eraser main body is scanned by described touch location detection device, with rectangular coordinate
System is as reference；There is described blackboard eraser main body on described touch pad, described microprocessor system is recorded
Coordinate figure during infrared signal is not received with the infrared receiving tube of described infrared transmitting tube correlation state；
On X-coordinate axle, at least two infrared receiving tubes are not received by the infrared letter that infrared transmitting tube is launched
Number, microprocessor system is considered as X-coordinate value X1 from the nearest infrared receiving tube of zero, from seat
X-coordinate value X2 of the mark farthest infrared receiving tube of initial point, at least two infrared transmitting tubes on Y coordinate axle
Corresponding infrared receiving tube is not received by the infrared signal that infrared transmitting tube is launched, microprocessor system
System is considered as Y-coordinate value Y1 from the nearest infrared transmitting tube of zero, from farthest infrared of zero
Y-coordinate value Y2 of transmitting tube；
In described blackboard eraser main body four angles A, B, C, D, the X-coordinate value of angle B is Xi, Y-coordinate value
Yi, Yi=Y1；
Described microprocessor system controls the described infrared receiving tube in described infrared receiver array and opens,
And control the infrared transmitting tube closedown in described infrared emission array, in scanning process, it is judged that infrared receiver
Whether pipe receives infrared signal, if receiving, then records the coordinate figure of described infrared receiving tube；
On X-coordinate axle, at least two infrared receiving tubes receive the infrared of described infrared launcher transmitting
Signal, microprocessor system processes described infrared signal, and is grouped infrared receiving tube, is considered as
Receive described blackboard eraser main body to connect with the infrared of infrared signal of two infrared launchers transmittings on one side
Closed tube is one group, and described microprocessor system takes from the nearest one group of infrared receiving tube of described zero,
The X-coordinate value of two infrared receiving tubes close to zero for Xa, away from zero for Xb,
The length of side of the blackboard eraser main body at two infrared launcher places is L1, and one of the transmitting of described blackboard eraser main body red
Outer Line beam and the angle theta of X-coordinate axle,
Described microprocessor system is judged when Xa is less than or equal to X1, then:Logical
Cross above-mentioned formula to obtain:
And then the coordinate obtaining an angle B of described blackboard eraser main body is Xi, Yi；
The coordinate at four angles of the most described blackboard eraser main body is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi；
The coordinate of angle C is X2,
The coordinate of angle D isY2；
Described microprocessor system is judged when Xa is more than X1, then:By upper
State formula to obtain:
And then the coordinate obtaining an angle B of described blackboard eraser main body is Xi, Yi；
The coordinate at four angles of the most described blackboard eraser main body is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi；
The coordinate of angle C is X2,
The coordinate of angle D isY2；
Described microprocessor system, according to the coordinate information at four angles of described blackboard eraser main body, determines described
The blackboard eraser main body band of position on a touchpad.
On X-coordinate axle, at least two infrared receiving tubes receive the infrared of described infrared launcher transmitting
Signal, microprocessor system processes described infrared signal, and is grouped infrared receiving tube, described
When microprocessor system receives the infrared signal of two infrared launcher transmittings at same angle, it is considered as connecing
Receive the infrared receiver of the infrared signal that two infrared launchers at the described same angle of blackboard eraser main body are launched
Guan Weiyi group, the X-coordinate value of two infrared receiving tubes close to zero for Xa, away from zero
For Xb, then:
Obtain Xi by above-mentioned formula, and then the coordinate obtaining the angle B of described blackboard eraser main body is Xi, Yi；
The coordinate at four angles of the most described blackboard eraser main body is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi；
The coordinate of angle C is X2,
The coordinate of angle D isY2；
Described blackboard eraser main body is the most square.
Described infrared launcher can use infrared LED, it is preferred to use infrared laser.
Described infrared launcher connects a power supply by a triggering switch, and described triggering switch is arranged on institute
Stating blackboard eraser body surfaces, described on-chip power is in described blackboard eraser main body.
Power supply can use battery, preferably button cell, in order to meets the volume of blackboard eraser main body.By touching
Send out on-off control infrared launcher and launch infrared signal.When not using blackboard eraser main body, close triggering and open
Closing, blackboard eraser main body, without launching infrared signal, saves electric energy.
Beneficial effect: owing to using technique scheme, the present invention wipes touch pad by blackboard eraser main body, and
Time to touch screen write information wipe, it is achieved touch screen erasing function, and realize structure letter
Single, low cost.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention；
Fig. 2 is the structural representation after Fig. 1 of the present invention sets up rectangular coordinate system；
Fig. 3 is the another kind of structural representation of the present invention；
Fig. 4 is the another kind of structural representation of the present invention.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be readily apparent from
Solve, the present invention is expanded on further below in conjunction with being specifically illustrating.
Reference Fig. 1, Fig. 2, Fig. 3, Fig. 4, accurate erasing system for infrared touch screens, infrared tactile including one
Touching screen main body, infrared touch panel main body includes touch pad 1, touch location detection device, a miniature place
Reason device system, touch location detection device include two groups of infrared emission arrays 11 being made up of infrared transmitting tube,
The infrared receiver array 12 that two groups are made up of infrared receiving tube, also includes a blackboard eraser main body 2, blackboard eraser main body 2
Rectangular, the length of side of blackboard eraser main body 2 adjacent two edges is respectively L1, L2, each edge of blackboard eraser main body 2
Two edges be equipped with an infrared launcher, infrared of two in each edge of blackboard eraser main body 2
The infrared light beam that injection device is launched is parallel to each other, and vertical with the limit at two infrared launcher places.
Infrared receiving tube in infrared receiver array 12 receives the infrared light beam that infrared launcher is launched, miniature
Processor system uses the mode of Time share scanning, controls infrared receiver array 12 timesharing respectively and receives infrared
Penetrating array 11 and the infrared signal of infrared launcher transmitting, microprocessor system acquisition receives infrared
The infrared receiving tube coordinate of Line beam, and according to blackboard eraser main body 2 size inputted, closed by triangle
It is computing, first calculates an angle of blackboard eraser main body 2 positional information on touch pad 1, then enter
One step calculates four angles of blackboard eraser main body 2 positional information on touch pad 1, and then determines blackboard eraser master
The body 2 band of position on touch pad 1, microprocessor system by blackboard eraser main body 2 touch pad 1
Put the information write at region to wipe, it is achieved the erasing function of infrared touch panel main body.The present invention
Using above-mentioned design, blackboard eraser main body 2 can accurately wipe on touchpad the information of write, and realize
Simple in construction, low cost, can well be applied in infrared touch panel main body.
Microprocessor system controls the infrared receiving tube in infrared receiver array 12 and opens, and controls infrared
Infrared transmitting tube in emission array 11 is lighted one by one, enters blackboard eraser main body 2 at touch location detection device
In row scanning process, using rectangular coordinate system as reference.
With reference to Fig. 2, Fig. 3, Fig. 4, touch pad 1 existing blackboard eraser main body 2, microprocessor system is remembered
The lower infrared receiving tube with infrared transmitting tube correlation state of record does not receive coordinate figure during infrared signal.X
On coordinate axes, at least two infrared receiving tubes are not received by the infrared signal that infrared transmitting tube is launched, micro-
Type processor system is considered as X-coordinate value X1 from the nearest infrared receiving tube of zero, from zero
X-coordinate value X2 of farthest infrared receiving tube, on Y coordinate axle at least corresponding to two infrared transmitting tubes
Infrared receiving tube be not received by infrared transmitting tube launch infrared signal, microprocessor system is considered as
From Y-coordinate value Y1 of the nearest infrared transmitting tube of zero, from the farthest infrared transmitting tube of zero
Y-coordinate value Y2.
In blackboard eraser main body 2 four angles A, B, C, D, the X-coordinate value of angle B is Xi, Y-coordinate value Yi,
Yi=Y1.
With reference to Fig. 2, Fig. 3, microprocessor system controls the infrared receiving tube in infrared receiver array 12
Open, and control the infrared transmitting tube closedown in infrared emission array 11, in scanning process, it is judged that infrared
Receiving whether pipe receives infrared signal, if receiving, then recording the coordinate figure of infrared receiving tube.X sits
On parameter, at least two infrared receiving tubes receive the infrared signal that infrared launcher is launched, miniature place
Reason device system processes infrared signal, and is grouped infrared receiving tube, is considered as receiving blackboard eraser main body 2
Infrared receiving tube with the infrared signal of two infrared launchers transmittings on one side is one group, miniature place
Reason device system takes from the nearest one group of infrared receiving tube of zero, the X-coordinate value of two infrared receiving tubes
Close to zero for Xa, away from zero for Xb, the blackboard eraser at two infrared launcher places
The length of side of main body 2 is L1, an infrared light beam of blackboard eraser main body 2 transmitting and the angle theta of X-coordinate axle,
With reference to Fig. 2, microprocessor system is judged when Xa is less than or equal to X1, then:
Obtained by above-mentioned formula:And then the coordinate obtaining an angle B of blackboard eraser main body 2 is
Xi, Yi.
Then the coordinate at four angles of blackboard eraser main body 2 is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi,
The coordinate of angle C is X2,
The coordinate of angle D isY2。
With reference to Fig. 3, microprocessor system is judged when Xa is more than X1, then:Logical
Cross above-mentioned formula to obtain:
And then the coordinate obtaining an angle B of blackboard eraser main body 2 is Xi, Yi.
Then the coordinate at four angles of blackboard eraser main body 2 is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi,
The coordinate of angle C is X2,
The coordinate of angle D isY2。
Microprocessor system, according to the coordinate information at four angles of blackboard eraser main body 2, determines blackboard eraser main body 2
The band of position on touch pad 1.
With reference to Fig. 4, on X-coordinate axle, at least two infrared receiving tubes receive infrared signal, miniature process
Device system processes infrared signal, and is grouped infrared receiving tube, and microprocessor system receives same
During the infrared signal that at angle, two infrared launchers are launched, it is considered as receiving at the same angle of blackboard eraser main body 2
The infrared receiving tube of infrared signal launched of two infrared launchers be one group, two infrared receiving tubes
X-coordinate value close to zero for Xa, away from zero for Xb, then:
And then the coordinate obtaining an angle B of blackboard eraser main body 2 is Xi, Yi.
Blackboard eraser main body 2 preferably square.Infrared launcher can use infrared LED, it is preferred to use red
Outer laser instrument.Infrared launcher connects a power supply by a triggering switch, triggers switch and is arranged on blackboard eraser
Main body 2 surface, on-chip power is in blackboard eraser main body 2.Power supply can use battery, preferably button cell,
To meet the volume of blackboard eraser main body 2.Infrared signal is launched by triggering on-off control infrared launcher.
When not using blackboard eraser main body 2, closing and trigger switch, blackboard eraser main body 2, without launching infrared signal, saves
Save electric energy.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.One's own profession
Skilled person will appreciate that of industry, the present invention is not restricted to the described embodiments, above-described embodiment and explanation
The principle that the present invention is simply described described in book, without departing from the spirit and scope of the present invention,
The present invention also has various changes and modifications, and these changes and improvements both fall within claimed invention model
In enclosing.Claimed scope is defined by appending claims and equivalent thereof.
Claims (10)
1. accurate erasing system for infrared touch screens, including an infrared touch panel main body, described infrared touch panel
Main body includes a touch pad, a touch location detection device, a microprocessor system, described touch position
Put that detection device includes two groups of infrared emission arrays being made up of infrared transmitting tube, two groups by infrared receiving tube
The infrared receiver array of composition, it is characterised in that also including a blackboard eraser main body, described blackboard eraser main body is square
Shape, the length of side of described blackboard eraser main body adjacent two edges is respectively L1, L2, each edge of described blackboard eraser main body
Two edges be equipped with an infrared launcher, described in two in each edge of described blackboard eraser main body
Infrared launcher launch infrared light beam be parallel to each other, and with two described infrared launcher places
Limit vertical；
Infrared receiving tube in described infrared receiver array receives the infrared ray that described infrared launcher is launched
Light beam, described microprocessor system obtains the infrared receiving tube coordinate receiving infrared light beam, and root
According to the described blackboard eraser size of main body inputted, by triangular relationship computing, first calculate described blackboard eraser
One angle of main body positional information on described touch pad；
During described blackboard eraser main body is scanned by described touch location detection device, with rectangular coordinate
System is as reference；There is described blackboard eraser main body on described touch pad, described microprocessor system is recorded
Coordinate figure during infrared signal is not received with the infrared receiving tube of described infrared transmitting tube correlation state；
On X-coordinate axle, at least two infrared receiving tubes are not received by the infrared letter that infrared transmitting tube is launched
Number, microprocessor system regards the X-coordinate value from the nearest infrared receiving tube of zero as X1, from seat
X-coordinate value X2 of the mark farthest infrared receiving tube of initial point, at least two infrared transmitting tubes on Y coordinate axle
Corresponding infrared receiving tube is not received by the infrared signal that infrared transmitting tube is launched, microprocessor system
System regards the Y-coordinate value from the nearest infrared transmitting tube of zero as Y1, from farthest infrared of zero
Y-coordinate value Y2 of transmitting tube；
In described blackboard eraser main body four angles A, B, C, D, the X-coordinate value of angle B is Xi, Y-coordinate value
Yi, Yi=Y1；
On X-coordinate axle, at least two infrared receiving tubes receive the infrared of described infrared launcher transmitting
Signal, microprocessor system processes described infrared signal, and is grouped infrared receiving tube, depending on connecing
Receive the infrared receiver of the infrared signal that described blackboard eraser main body is launched with two infrared launchers on one side
Guan Weiyi group, described microprocessor system takes from the nearest one group of infrared receiving tube of described zero,
The X-coordinate value of two infrared receiving tubes close to zero for Xa, away from zero for Xb,
The length of side of the blackboard eraser main body at two infrared launcher places is L1, and one of the transmitting of described blackboard eraser main body red
Outer Line beam and the angle theta of X-coordinate axle,
Described microprocessor system is judged when Xa is less than or equal to X1, then:Logical
Cross above-mentioned formula to obtain:
And then the coordinate obtaining an angle B of described blackboard eraser main body is Xi, Yi；
Described microprocessor system is judged when Xa is more than X1, then:By upper
State formula to obtain:
And then the coordinate obtaining an angle B of described blackboard eraser main body is Xi, Yi；
Calculate four angles of described blackboard eraser main body positional information on described touch pad the most further,
And then determining the described blackboard eraser main body band of position on a touchpad, described microprocessor system is by blackboard eraser
The information that main body is write at touchpad position region is wiped, it is achieved described infrared touch panel main body
Erasing function.
2. accurate erasing system for infrared touch screens, including an infrared touch panel main body, described infrared touch panel
Main body includes a touch pad, a touch location detection device, a microprocessor system, described touch position
Put that detection device includes two groups of infrared emission arrays being made up of infrared transmitting tube, two groups by infrared receiving tube
The infrared receiver array of composition, it is characterised in that also including a blackboard eraser main body, described blackboard eraser main body is square
Shape, the length of side of described blackboard eraser main body adjacent two edges is respectively L1, L2, each edge of described blackboard eraser main body
Two edges be equipped with an infrared launcher, described in two in each edge of described blackboard eraser main body
Infrared launcher launch infrared light beam be parallel to each other, and with two described infrared launcher places
Limit vertical；
Infrared receiving tube in described infrared receiver array receives the infrared ray that described infrared launcher is launched
Light beam, described microprocessor system obtains the infrared receiving tube coordinate receiving infrared light beam, and root
According to the described blackboard eraser size of main body inputted, by triangular relationship computing, first calculate described blackboard eraser
One angle of main body positional information on described touch pad；
During described blackboard eraser main body is scanned by described touch location detection device, with rectangular coordinate
System is as reference；There is described blackboard eraser main body on described touch pad, described microprocessor system is recorded
Coordinate figure during infrared signal is not received with the infrared receiving tube of described infrared transmitting tube correlation state；
On X-coordinate axle, at least two infrared receiving tubes are not received by the infrared letter that infrared transmitting tube is launched
Number, microprocessor system regards the X-coordinate value from the nearest infrared receiving tube of zero as X1, from seat
X-coordinate value X2 of the mark farthest infrared receiving tube of initial point, at least two infrared transmitting tubes on Y coordinate axle
Corresponding infrared receiving tube is not received by the infrared signal that infrared transmitting tube is launched, microprocessor system
System regards the Y-coordinate value from the nearest infrared transmitting tube of zero as Y1, from farthest infrared of zero
Y-coordinate value Y2 of transmitting tube；
In described blackboard eraser main body four angles A, B, C, D, the X-coordinate value of angle B is Xi, Y-coordinate value
Yi, Yi=Y1；
On X-coordinate axle, at least two infrared receiving tubes receive the infrared of described infrared launcher transmitting
Signal, microprocessor system processes described infrared signal, and is grouped infrared receiving tube, described
When microprocessor system receives the infrared signal of two infrared launcher transmittings at same angle, depending on receiving
The infrared receiving tube of the infrared signal that two infrared launchers at the described same angle of blackboard eraser main body are launched
Be one group, the X-coordinate value of two infrared receiving tubes close to zero for Xa, away from zero
For Xb, then:
Obtain Xi by above-mentioned formula, and then the coordinate obtaining the angle B of described blackboard eraser main body is Xi, Yi；
Calculate four angles of described blackboard eraser main body positional information on described touch pad the most further,
And then determining the described blackboard eraser main body band of position on a touchpad, described microprocessor system is by blackboard eraser
The information that main body is write at touchpad position region is wiped, it is achieved described infrared touch panel main body
Erasing function.
Accurate erasing system for infrared touch screens the most according to claim 1, it is characterised in that in institute
State during described blackboard eraser main body is scanned by touch location detection device, using rectangular coordinate system as ginseng
Examine；There is described blackboard eraser main body on described touch pad, described microprocessor system is recorded red with described
The infrared receiving tube of emission pipe correlation state does not receive coordinate figure during infrared signal；
On X-coordinate axle, at least two infrared receiving tubes are not received by the infrared letter that infrared transmitting tube is launched
Number, microprocessor system regards the X-coordinate value from the nearest infrared receiving tube of zero as X1, from seat
The X-coordinate value of the mark farthest infrared receiving tube of initial point is X2, at least two infrared emission on Y coordinate axle
Infrared receiving tube corresponding to pipe is not received by the infrared signal that infrared transmitting tube is launched, microprocessor
System regards the Y-coordinate value from the nearest infrared transmitting tube of zero as Y1, from farthest red of zero
The Y-coordinate value of emission pipe is Y2；
In described blackboard eraser main body four angles A, B, C, D, the X-coordinate value of angle B is Xi, Y-coordinate value
Yi, Yi=Y1；
On X-coordinate axle, at least two infrared receiving tubes receive the infrared of described infrared launcher transmitting
Signal, microprocessor system processes described infrared signal, and is grouped infrared receiving tube, depending on connecing
Receive the infrared receiver of the infrared signal that described blackboard eraser main body is launched with two infrared launchers on one side
Guan Weiyi group, described microprocessor system takes from the nearest one group of infrared receiving tube of described zero,
The X-coordinate value of two infrared receiving tubes close to zero for Xa, away from zero for Xb,
The length of side of the blackboard eraser main body at two infrared launcher places is L1, and one of the transmitting of described blackboard eraser main body red
Outer Line beam and the angle theta of X-coordinate axle,
Described microprocessor system is judged when Xa is less than or equal to X1, then:Logical
Cross above-mentioned formula to obtain:
And then the coordinate obtaining an angle B of described blackboard eraser main body is Xi, Yi；
The coordinate at four angles of the most described blackboard eraser main body is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi；
The coordinate of angle C is X2,
The coordinate of angle D is
Described microprocessor system is judged when Xa is more than X1, then:By upper
State formula to obtain:
And then the coordinate obtaining an angle B of described blackboard eraser main body is Xi, Yi；
The coordinate at four angles of the most described blackboard eraser main body is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi；
The coordinate of angle C is X2,
The coordinate of angle D is
Described microprocessor system, according to the coordinate information at four angles of described blackboard eraser main body, determines described
The blackboard eraser main body band of position on a touchpad.
Accurate erasing system for infrared touch screens the most according to claim 2, it is characterised in that in institute
State during described blackboard eraser main body is scanned by touch location detection device, using rectangular coordinate system as ginseng
Examine；There is described blackboard eraser main body on described touch pad, described microprocessor system is recorded red with described
The infrared receiving tube of emission pipe correlation state does not receive coordinate figure during infrared signal；
On X-coordinate axle, at least two infrared receiving tubes are not received by the infrared letter that infrared transmitting tube is launched
Number, microprocessor system regards the X-coordinate value from the nearest infrared receiving tube of zero as X1, from seat
The X-coordinate value of the mark farthest infrared receiving tube of initial point is X2, at least two infrared emission on Y coordinate axle
Infrared receiving tube corresponding to pipe is not received by the infrared signal that infrared transmitting tube is launched, microprocessor
System regards the Y-coordinate value from the nearest infrared transmitting tube of zero as Y1, from farthest red of zero
The Y-coordinate value of emission pipe is Y2；
In described blackboard eraser main body four angles A, B, C, D, the X-coordinate value of angle B is Xi, Y-coordinate value
Yi, Yi=Y1；
On X-coordinate axle, at least two infrared receiving tubes receive the infrared of described infrared launcher transmitting
Signal, microprocessor system processes described infrared signal, and is grouped infrared receiving tube, described
When microprocessor system receives the infrared signal of two infrared launcher transmittings at same angle, depending on receiving
The infrared receiving tube of the infrared signal that two infrared launchers at the described same angle of blackboard eraser main body are launched
Be one group, the X-coordinate value of two infrared receiving tubes close to zero for Xa, away from zero
For Xb, then:
Obtain Xi by above-mentioned formula, and then the coordinate obtaining the angle B of described blackboard eraser main body is Xi, Yi；
The coordinate at four angles of the most described blackboard eraser main body is respectively as follows:
The coordinate of angle A is X1,
The coordinate of angle B is Xi, Yi；
The coordinate of angle C is X2,
The coordinate of angle D is
Described microprocessor system, according to the coordinate information at four angles of described blackboard eraser main body, determines described
The blackboard eraser main body band of position on a touchpad.
Accurate erasing system for infrared touch screens the most as claimed in any of claims 1 to 4, its
Being characterised by, described blackboard eraser main body uses square.
Accurate erasing system for infrared touch screens the most according to claim 1, it is characterised in that described
Infrared launcher uses infrared LED.
Accurate erasing system for infrared touch screens the most according to claim 2, it is characterised in that described
Infrared launcher uses infrared LED.
Accurate erasing system for infrared touch screens the most according to claim 1, it is characterised in that described
Infrared launcher uses infrared laser.
Accurate erasing system for infrared touch screens the most according to claim 2, it is characterised in that described
Infrared launcher uses infrared laser.
10. according to the accurate erasing system for infrared touch screens described in claim 1,2,6,7,8 or 9,
It is characterized in that, described infrared launcher connects a power supply by a triggering switch, and described triggering switchs
Being arranged on described blackboard eraser body surfaces, described on-chip power is in described blackboard eraser main body.
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