CN1188286A - Drawing board and drawing method - Google Patents
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- CN1188286A CN1188286A CN97106748A CN97106748A CN1188286A CN 1188286 A CN1188286 A CN 1188286A CN 97106748 A CN97106748 A CN 97106748A CN 97106748 A CN97106748 A CN 97106748A CN 1188286 A CN1188286 A CN 1188286A
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Abstract
The present invention relates to a device for converting the position of pen on the flat-plate into electric signal and its converting method. Said invention designs a pen capable of producing alternating magnetic field and a flat-plate capable of receiving pen point position. The interior of the pen cavity possesses a bar magnet with coil, and under the flat-plate there are four groups of receiving antennas, in which two groups of receiving antennas are arranged along X-direction, and another two groups of receiving antennas are arranged along Y-direction. The signal obtained by antennas is passed through the processes of amplification, synchrodyne detection, filtering, zero-cross detection and microcontroller treatment so as to obtain the accurate position of pen point on the drawing board.
Description
The present invention relates to a kind of device and conversion method thereof that the position of the pen on the flat board can be converted to electric signal.
Active computer is selected the required screen position of user with Genius mouse, and is simple, directly perceived, but functions of use is limited, can not transfer signals to screen by end user's wish, thereby demonstrates literal, numeral, picture.Also useful in recent years digitizer carries out electron transport with people's written information.Small-sized digitizer claims drawing board again.Digitizer mainly contains two kinds: a kind of is that the material that certain is made of special material is housed under the plate face, and the propagation of electromagnetic wave in this material is delayed, and measures the position that the phase place that postpones just can converse the electromagnetic wave launching site by the terminal at this material; Another kind is that each one group of X, Y direction form antenna by the many leads that are parallel to each other, and what have is made in emissive source on the pen, uses antenna receiving signal; Have with antenna as emissive source, receiving element is made on the pen.Above-mentioned two class devices are handled to the received signal and are broadly divided into: (1) relies on the A/D conversion, determines fixed position by the maximal value of determining signal; (2) by phaselocked loop (Phase-Lock-Loop); (3) pass through synchronous detection.(with reference to U.S Patent documents 4,616,106 10/1986) still two kinds of methods all has deficiency, the locating device that first method produces has than higher precision, but material is to be made by coiling and so on means, complex process: second method, be limited by the distance of pen, the length of side of aerial array grid to antenna.The length of side is short more, and precision is high more, but pen must nearlyer antenna, and signal/noise ratio this moment (S/N) also will suffer damage, so the precision difficulty has substantial raising.
The objective of the invention is to design a kind of simple in structure and can accurately determine position on the drawing board and convert the device and the conversion method thereof of electric signal to.
Device of the present invention has two parts, and the one, the pen that can generate an electromagnetic field, another is the flat board that receiving antenna is housed.Pen is that a hollow bar magnet is arranged in a chamber, bar magnet is around with coil, and by having the pen core of nib, remaining spring, pad, switch and line thereof are arranged in an afterbody in the bar magnet, draw a shell and a shovel exposes the shell by the part of formula button except that line, all the other all are included in the shell.Spring links to each other with the pad of pen core, close switch, forms a switch together with the pad on the bar magnet head, is equivalent to the mouse left button; Another button can be made into shovel by formula, is equivalent to right mouse button.
Four group of received antennas are arranged below flat board, Fig. 6 has provided orthogonal X, each two prescription of Y direction to opposite totally four group of received antenna synoptic diagram, every group of antenna is made up of lead parallel to each other, the whole ground connection of one end of lead, the other end has two kinds of connected modes: the one, be connected to multi-way switch, and another is unsettled, for the purpose of narration, claim the lead that is connected to multi-way switch to take line as the leading factor, claim that unsettled lead is an auxiliary traverse.
With reference to figure 2.Fig. 2 describes the shape of antenna in detail.For the sake of simplicity, two groups of antennas of the direction of only having drawn among the figure, in fact vertical with this direction direction also has same antenna.As can be seen from Figure 2: every group of antenna all is made of the lead that is parallel to each other, and these leads are common end ground connection all, and the other end has is connected to multi-way switch, and what have is unsettled.The former is called as main traverse line, and the latter is an auxiliary traverse.11,12 point to main traverse line among Fig. 2, and 13,14 point to auxiliary traverse.It can also be seen that by Fig. 2 every main traverse line carries two auxiliary traverses symmetrically.Antenna receives the electric signal that comes from pen, and after treatment, its phase place is linear with the position of pen, thereby obtains corresponding coordinate figure.
The position that produces the pen of alternating electromagnetic field converts electric signal to through receiving big line.The mathematical formulae that uses is as follows:
Four group of received antennas are divided into orthogonal each two prescription to opposite antenna, and every group of antenna is made up of lead parallel to each other, and in a group of received antenna, A takes the collection of line as the leading factor, and B, C are respectively the collection of left and right auxiliary traverse, with reference to figure 2.
If the distance of adjacent wires is D among the A, multi-way switch 34 is lead in the scan A from left to right, and time corresponding is [0,8*T], and T is the time of a lead of scanning.Pen to the distance of Far Left lead is x.Alternating current sin (2 π t/T) is flowing in the pen this moment.
The situation of A group lead.Near the nib alternating electromagnetic field makes this group lead produce induced electromotive force f (2 π (t/T-x/D)) sin (2 π t/T), and promptly modulation signal f (2 π (t/T-x/D)) is long-pending with carrier signal sin (2 π t/T).The functional digraph of f is Fig. 7: in the time of directly over pen occupy certain lead, it is 0 that lead produces induced electromotive force, so f (0)=0; Because it is reverse that the lead on the lead on a left side and pen the right produces induced electromotive force, thus f (z) when z＜0 for just, when z＞0, be to bear; When certain root lead when pen is far away, it is just smaller that lead produces induced electromotive force, thus f (z) when | smaller when z| is bigger.
The situation of B group lead.According to above-mentioned reasoning, the induced electromotive force that draws B group lead is
k*f(2π(t/T-x/D+1/3))sin(2πt/T).
Wherein, the width of the width/main traverse line of k=auxiliary traverse.
The situation of C group lead.In like manner, the induced electromotive force that draws C group lead is:
k*f(2π(t/T-x/D-1/3))sin(2πt/T).
By 34 each root lead of gating A group in turn, produce induced current by the induced electromotive force of three groups of A, B, C, obtain
{f(2π(t/T-x/D))+k[f(2π(t/T-x/D+1/3))+f(2π(t/T-x/D-1/3))]}
sin(2πt/T).
Phase-detection through in 37 obtains
{f(2π(t/T-x/D))+k[f(2π(t/T-x/D+1/3))+f(2π(t/T-x/D-1/3))]}
*sin(2πt/T)*sin(2πt/T).
Through 38, the elimination HFS to the t integration, obtains then
(1+0.707k)g(2π(t/T-x/D)).
Wherein, g has the shape of similar T.
Zero passage detection through in 39 obtains phase signal 2 π x/D.
Microcontroller 31 converts 2 π x/D to digital T (x/D), i.e. Bi coordinate by counter.
Conclusion: the phase signal of one group of antenna is linear with the position of pen; The effect of factor k is the amplitude that increases received signal, therefore can suitably strengthen D.
With four groups of mathematical formulaes that antenna is relevant:
If the coordinate of the nib that two groups of antennas of directions X record is X1, X2, then whole coordinate can be given by formula
Go out:
X＝2X2+X1?mod?2-------------------(A)
As the same to the Y direction.
X-axis provided by the invention, each two prescription of Y direction are to four groups of opposite antennas, and the conversion of signals that antenna is received becomes the respective coordinate value of pen, and by formula (A), final coordinate figure can be obtained by the coordinate figure of the both direction of same coordinate.Therefore for the device that has only X, each cover antenna of Y direction, the bearing accuracy of this device is its twice.
With reference to figure 3.The pen that generates an electromagnetic field is following array structure: 21 expression bar magnets, 22 expression coils, 23,24 expression pads, 25 expression springs, 26 expression pads, 27 expression switches, 28 an expression shell, 29 expressions have the pen core of nib, 2a represents the lead-in wire of coil 22 1 ends, 2b represents common ground, and 2c represents the lead-in wire of switch 27 1 ends, and 2d represents the lead-in wire of pad 26.The hollow bar magnet (21) that is fixed in the chamber is around with coil (22), bar magnet one end is fixed with pad (23), there is the pen core of nib (29) to pass hollow bar magnet, pen core passes bar magnet and partly is with spring (25), spring two is fixed with pad (24) and (26), pad (24) is fixed on the pen core and can moves up and down with pen core, pad (26) relies on shovel to be fixed in the chamber by formula button (27), when nib not during pressurized, pad (24) spaces out because of spring force with (26), and make and leave the space between pen core and the pad (26) and can move up and down for pen core, also pad (23) and (24) are kept in touch simultaneously because of the elastic force of spring.Coil (22) is drawn line (2a) near an end of nib and is connected to sinusoidal signal generator (33), common ground (2b) connects one of the other end of coil (22), pad (23), switch (27) end, the other end of switch (27) is drawn lead (2c), pad (26) is drawn lead (2d), and connecting line is all drawn from an afterbody.When nib was under pressure, pen core drives pad (24) extrusion spring disengaged pad (24) and (23), thereby produces the effect of a mouse click left button; Another switch (27) is pressed formula for shovel, and the aperture that its button part passes on the shell exposes a shell, presses the effect that this button produces a mouse click right button.
The 2a that draws from pen, 2b, 2c, 2d lead to control circuit board from a tail.With reference to figure 4,31 is microcontroller among Fig. 4, and 32 is serial communication unit, and 33 is sinusoidal wave generation unit, and 34 is multi-way switch, and 36 is the elementary amplifying unit of signal, and 37 is the synchronous detection unit, and 38 is filter unit, and 39 is the zero passage detection unit.Every group of antenna has 8 main traverse lines in this example.Because total 4*8 root main traverse line, so select a multi-way switch to form 34 with four 8.Four I/O mouths of microcontroller 31 usefulness line 35 comes four multi-way switchs in the gating 34 in turn, 31 also takes turns 8 lines of each multi-way switch of gating with three I/O mouth lines simultaneously.
With reference to figure 5.Microcontroller 31 at first by 35 selected one group of antenna, sends the square wave e1 that wavelength is 100 μ s by an I/O mouth then, by the 33 sinusoidal wave e2 that are modulated into balance.Because the principle of balancing circuitry is known, the Therefore, omited.By lead 2a, form alternating electromagnetic field near the nib.Meanwhile, 34 8 main traverse lines of one group of antenna of gating in turn, the time interval is 100 μ s.When nib during, there is weak current in the main traverse line of gating, to flow near selected antenna.By 34, this electric current is sent to 36 and amplifies, and obtains electric signal e3.Because 36 principle is known, so do not describe in detail.E3 and e1 carry out synchronous detection in 37, obtain electric signal e4.The principle of synchronous detection also is known, so omit.E4 is sent to 38, and the elimination HFS obtains electric signal e5.The principle of filtering circuit also is known, so do not address.Electric signal e5 zero passage detection in 39 obtains the 31 electric signal e6 that can handle.E6 by the trip point of Vcc to 0V, corresponding one by one with pen to the distance of day line boundary.Owing to have four groups of antennas, so figure e7, e8, e9, e10, e11 and e12 are arranged.The time slot of every group of antenna gating is 100 μ s*15, and four groups of antennas of gating have been spent times 100 μ s*100 altogether in turn.E13 represents that 31 carry out data processing, and its time is 2.5ms.E14 represents that 31 pass through 32 transmission data to computer, has spent 25 ms.
Device of the present invention is work like this: with suitable pulse, just form alternating electromagnetic field to the coil in the pen around the nib; Gating main traverse line in turn obtains comprising the feeble signal of pen tip position information, through amplification, synchronous detection, filtering, zero passage detection, converts the signal that microcontroller can be handled to; The unique point of this signal is linear to the distance at drawing board center with pen, calculate four coordinate figures of nib on graphic boards thus easily: the mathematical formulae (A) that provides through the present invention, final coordinate figure can be obtained by the coordinate figure of the both direction of same coordinate.For the device that has only X, each cover antenna of Y direction, the bearing accuracy of this device is its twice.
The invention provides a kind of device, can determine X, the Y coordinate of specified point position on the drawing board.Install mainly and form by the pen that can the produce alternating electromagnetic field receiving antenna following with being contained in flat board.Antenna receives the signal from pen, and after the mathematical processing methods that process the inventive method provides was handled, its phase place was linear with the position of pen.Pen and receiving antenna are simple in structure, have brought convenience to the making of this device.Because the present invention has used orthogonal X, each two prescription of Y direction to opposite totally four group of received antennas, thereby, learn that the bearing accuracy that the present invention obtains is to have only the twice of the device of X, each cover antenna of Y direction by the mathematical formulae (A) that the present invention provides.In sum, the present invention is simple in structure, the degree of accuracy height, and method is reliable.
Fig. 1 is apparatus of the present invention synoptic diagram, 1 expression working panel in Fig. 1, and 2 expression pens, panel is connected by lead 3 with pen, and whole device is connected with computer by lead 4, and device links to each other with power supply by line 5.
Fig. 2 is that two prescriptions of X-axis of the present invention are to opposite antenna synoptic diagram.
Fig. 3 is the organigram of pen.
Fig. 4 is the device circuit block diagram.
Fig. 5 is the device electrical schematic diagram.
Fig. 6 is that orthogonal X, each two prescription of Y direction are to opposite totally four group of received antenna synoptic diagram.
Fig. 7 is one group of pairing modulation signal figure of antenna.
Embodiment: the invention process process is as follows:
1. the analyst-programmer analyzes mouse drivers such as msmouse.drv under DOS, WIN3.X, the WIN95 operating system, msmouse sys, msmouse.com, msmouse.exe earlier, determine the scheme of drawing board driver under DOS, WIN3.X, WIN95 operating system, make drawing board have mouse function.
2. according to analyst-programmer's scheme, advanced procedures slip-stick artist designs the driver of drawing board under DOS, WIN3.X, WIN95 operating system, and the serial communication mode of definite drawing board.
3. the principle of Electronics Engineer in according to the present invention according to the serial communication mode that the advanced procedures slip-stick artist determines, adopts MCS51 sequence microcontroller, writes out Control Software with ASM51 or Franklin C51.With ORCAD or PROTEL Electronic CAD design circuit figure, obtain schematic diagram, PCB figure, electronic devices and components tabulation.Wherein:
Bar magnet length is that 24 millimeters, internal diameter are that 3.5 millimeters, external diameter are 6 millimeters in the pen, and bar magnet is outer to be 0.14 millimeter 7.8 meters in enameled wire around specification;
Receiving antenna is printed on the double-sided PCB, and two groups every, every group of received antenna is made up of 8 main traverse lines and 16 auxiliary traverses, 62 millimeters of leading line lengths, wide 1 millimeter, and long 61 millimeters, wide 0.5 millimeter of auxiliary traverse, distance is 1 millimeter between the two;
Adopting the 89C51 of Atmel company is controller 31;
Adopting Fig. 9 .1 serial port communication experimental line in " SICE general single chip emulator and application thereof " (Tu Shiliang, Zhang Youde compile, and publishing house of Fudan University publishes in April, 1992) is serial-port communication circuit 32;
Adopting 6.24 usefulness in " the complete works of volume of electronic circuit 4 special circuits " ([U.S.] J. Ma Kusi, the tissue compiling of editorial office of metering publishing house, 1985, Beijing) to lock Xiang Huan, square wave is transformed into sine wave is 33;
Adopt four pieces of CD4051 to constitute 34;
Adopting the 3-223 AC coupling polarity-inverting amplifier in " National Semiconductor's linear integrated circuit characteristic and application manual " (total school cross cypress age) is 36;
Adopting Fig. 5 .3.15 C1496 formation lock detector circuit diagram in " High-Frenquency Electronic Circuit " (Wu Xiuling, Shen Weici write publishing house of Xian Electronics Science and Technology University and publish May nineteen ninety-five) is 37;
Adopting the 3-224 active band pass filter in " National Semiconductor's linear integrated circuit characteristic and application manual " (total school cross cypress age) is 38;
Adopting the 5-34 zero cross detection circuit in " National Semiconductor's linear integrated circuit characteristic and application manual " (total school cross cypress age) is 39;
4. the mould design engineer is according to PCB figure design drawing board external form.Fig. 3 designs the external form of pen according to the present invention.
5. the graphic designer is according to natural scale, and design is decorate and carton.
6. the electron device purchasing agent pays board production producer with Electronics Engineer's PCB figure, produces circuit board.And be equipped with some in PC computer, oscillograph several, immersed solder stove, scolding tin, no-clean scaling powder.The some covers of electronic devices and components are purchased in tabulation according to electronic devices and components.Mould manufacturer produces shell and the some covers of pen.Carton manufacturer produces the some covers of carton.
7. the electron device millwright is responsible for electronic devices and components are inserted circuit board.Molten tin is in the immersed solder stove.Circuit board is immersed scaling powder.Again circuit board was immersed molten tin 10 seconds.
The millwright Fig. 3 assembles pen according to the present invention.
9 electron device millwrights under Electronics Engineer and mould design engineer's guidance, assemble drawing board according to Fig. 1 of the present invention.
10. electronic checkout person is according to Fig. 5 of the present invention, under Electronics Engineer's guidance, with oscillograph check circuit plate.
11. the junior programmer under advanced procedures slip-stick artist's guidance, links to each other drawing board with the computer serial port, make computer enter DOS, WIN3.X, WIN95 operating system successively, checks the working condition of drawing board under the driver of advanced procedures slip-stick artist design.
12. the sacker is with the drawing board carton of packing into, built-in contains the floppy disk and the quality guarantee certificate of driver.
Claims (3)
1. drawing board device, comprise the pen that can produce alternating electromagnetic field and be contained in dull and stereotyped following receiving antenna, it is characterized in that the coil that exchange current flows through in the chamber on the bar magnet produces alternating electromagnetic field, this alternating electromagnetic field acts on receiving antenna and produces induced electromotive force; The pen core that has nib passes through bar magnet, remaining spring, pad, switch and line thereof are arranged in an afterbody, except that line is drawn a shell and a shovel exposes the shell by the part of formula button, all the other all are included in the shell: X-axis is housed below the flat board, each two prescription of Y direction are to opposite totally four group of received antennas, every group of antenna is made up of lead parallel to each other, the whole ground connection of one end of lead, the other end has two kinds of connected modes: the one, be connected to multi-way switch, another is unsettled, the electric signal that receiving antenna produces is through amplifying, synchronous detection, filtering, zero passage detection converts the information signal of pen tip position to signal that microcontroller can be handled.
2. the signal conversion method of a drawing board, the position that can produce the pen of alternating electromagnetic field converts the method for electric signal to through receiving antenna, it is characterized in that four group of received antennas are divided into X-axis, each two prescription of Y direction are to opposite antenna, every group of antenna is made up of lead parallel to each other, one end of these leads is ground connection all, the other end has is connected to multi-way switch, what have is unsettled, one lead that is connected to multi-way switch is called main traverse line, the unsettled lead of one end is called auxiliary traverse, in one group of antenna, A takes the collection of line as the leading factor, B, C is respectively a left side, the collection of right redundant lead, then the formula of the induced electromotive force of its generation is: A group: f (2 π (t/T-x/D)) sin (2 π t/T). B group: k*f (2 π (t/T-x/D+1/3)) sin (2 π t/T). and C group: k*f (2 π (t/T-x/D-1/3)) sin (2 π t/T). through multi-way switch, amplify, synchronous detection, filtering, zero passage detection, obtain phase signal: 2 π x/D, convert digital T (x/D), i.e. Bi coordinate to by microcontroller; If establish nib coordinate that two groups of antennas of directions X record for being respectively X1, X2, then the coordinate formula of whole directions X is:
The X=2X2+X1mod2.Y direction is analogized according to above-mentioned.
3. drawing board device according to claim 1, it is characterized in that the pen that generates an electromagnetic field can be following array structure: the hollow bar magnet (21) that is fixed in the chamber is around with coil (22), bar magnet one end is fixed with pad (23), there is the pen core of nib (29) to pass hollow bar magnet, pen core passes bar magnet and partly is with spring (25), spring two is fixed with pad (24) and (26), pad (24) is fixed on the pen core and can moves up and down with pen core, pad (26) relies on shovel to be fixed in the chamber by formula button (27), coil (22) is drawn line (2a) near an end of nib and is connected to sinusoidal signal generator (33), common ground (2b) is with the other end of coil (22), pad (23), one of switch (27) end connects, the other end of switch (27) is drawn lead (2c), pad (26) is drawn lead (2d), and connecting line is all drawn from an afterbody.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97106748A CN1188286A (en) | 1997-11-28 | 1997-11-28 | Drawing board and drawing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97106748A CN1188286A (en) | 1997-11-28 | 1997-11-28 | Drawing board and drawing method |
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| CN1188286A true CN1188286A (en) | 1998-07-22 |
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| CN97106748A Pending CN1188286A (en) | 1997-11-28 | 1997-11-28 | Drawing board and drawing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101133382B (en) * | 2004-12-01 | 2016-03-30 | 微软技术许可有限责任公司 | Location detection system and the apparatus and method for using and control this location detection system |
-
1997
- 1997-11-28 CN CN97106748A patent/CN1188286A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101133382B (en) * | 2004-12-01 | 2016-03-30 | 微软技术许可有限责任公司 | Location detection system and the apparatus and method for using and control this location detection system |
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