CN201348772Y

CN201348772Y - Pen position sensor

Info

Publication number: CN201348772Y
Application number: CNU2009201012104U
Authority: CN
Inventors: 崔伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-01-06
Filing date: 2009-01-06
Publication date: 2009-11-18
Anticipated expiration: 2019-01-06

Abstract

The utility model relates to a pen position sensor matched with a point read machine in use, which comprises a wireless signal transmitting pen, a wireless signal receiving antenna array and a wireless signal receiver. The wireless signal receiving antenna array comprises a trigger sub antenna and a position sub antenna; and the wireless signal receiver comprises a trigger sub antenna signal conditioning circuit, a position sub antenna signal adjusting circuit and a central processor. The utility model has the advantages of low power consumption, strong anti-interference capacity, low cost, high accuracy and good hand feeling, and can sense the height and the gradient of wireless transmitting pens.

Description

Position transducer

Technical field:

The utility model relates to a kind of and matching used position transducer of point reader.

Background technology:

At present, the phonetic study device that has multiple child altogether, children to use on the market, electronic speech book, early learning machine, point reader etc. are arranged, though title difference but principle of work is essentially identical, the saying of " point reader " is occupied leading position now, for convenience, we claim that tentatively it is a point reader, their common characteristic are made up of a position transducer and main frame two parts, position transducer detects the position of the click action of the pen that the user hands, and main frame is according to the location retrieval of the clicking multi-medium data corresponding with textbook and play back.

Wherein a position transducer comprises wireless signal transmission pen, wireless signal receiving antenna array and wireless signal receiver, the click action of a wireless signal transmission detecting pen also sends wireless signal, wireless signal receiver passes through the wireless signal of wireless signal receiving antenna array received wireless signal transmission pen emission, and it is processed into the signal that the point reader main frame can receive; The wireless signal receiving antenna array is made up of the position sub antenna of level, vertical both direction, and the relative distance between the sub antenna of adjacent position is about 1/3 of position sub antenna width; Wireless signal receiver comprises position sub antenna signal conditioning circuit and central processing unit, it has two kinds of forms again: a kind ofly be to use independent central processing unit that the output signal of position sub antenna signal conditioning circuit is processed into the central processing unit (as the utility model patent of the patent No. for " 200420003299.8 ") that coordinate data sends it to main frame, a kind of is the central processing unit (as the utility model patent of the patent No. for " 200620015965.9 ") that the output of position sub antenna signal conditioning circuit directly sends to main frame, the central processing unit of main frame will become coordinate data to be used for retrieving multimedia data from the signal Processing of position sub antenna signal conditioning circuit, it should be noted that the central processing unit of a kind of form wireless signal receiver in back and the central processing unit that multimedia is handled are shared.

A position transducer working method of existing technical scheme is a scan mode, the state of each position sub antenna of the scanning that need not stop, central processing unit is in running order always can not dormancy, in case dormancy then scan stops normally to detect the click action of pen, and in the practical application in most of times system wait user input do not have what function, so wasted a lot of electric weight, Overall Power Consumption is bigger.

Consider hardware cost, wireless receiving antenna array in an existing position transducer all uses the printed-wiring board (PWB) of plastic basis material, its connecting line uses conductive silver paste, in addition because the conductance that silver is starched in the printed-wiring board (PWB) of plastic basis material is more a lot of greatly than the conductance of copper sheet in the common printed wiring board, can introduce bigger interference, because existing point reader fails effectively to eliminate to disturb, thereby influenced the accuracy of clicking, even in some rugged environments, make disabler, the silver slurry costs an arm and a leg the cost height in addition;

Another outer problem of a position transducer of existing scheme is, because the position deviation between the adjacent sub antenna is about 1/3 of a sub antenna width, sampling number is less relatively, precision can reduce much when clicking the pen inclination, if the angle that tilts is bigger, click location can be offset to the intolerable degree of user.

In addition, the wireless signal transmission pen of point reader use on the market uses switching point detection to hit action more now, and feel is poor, does not meet use habit, and the talking pen of a kind of detected pressures that the utility model patent of " 2008200945913 " discloses has solved the feel problem.

The utility model content:

, poor anti jamming capability big for the power consumption that solves an existing position transducer, cost height, pen tilt to click that precision is low, the problem of feel difference, and the technical solution of the utility model is as follows:

Construct a kind of position transducer, comprise wireless signal transmission pen, wireless signal receiving antenna array and wireless signal receiver, described wireless signal receiving antenna array comprises triggering sub antenna, position sub antenna, and described wireless signal receiver comprises triggering sub antenna signal conditioning circuit, position sub antenna signal conditioning circuit, central processing unit; Central processing unit is connected by analog switch control appointed positions sub antenna and position sub antenna signal conditioning circuit, position subsignal antenna modulate circuit receives wireless signal from the wireless signal transmission pen with the position sub antenna of its connection, wireless signal passes to central processing unit by amplification, filtering, detection, the amplification of position sub antenna signal conditioning circuit with signal, central processing unit is control position sub antenna and the connection of position sub antenna signal conditioning circuit in a certain order, the scanning position sub antenna, and obtain sampled data on each sub antenna; Of the present utility model being characterised in that, in the central processing unit dormancy, under the state of stop position sub antenna scanning, the wireless signal that triggers the sub antenna signal conditioning circuit and launch with the triggering sub antenna detected wireless signals emission pen of connecting, trigger the sub antenna signal conditioning circuit and convert having or not of wireless signal to high-low level, when click action, wireless signal transmission pen emission wireless signal, the wireless signal that triggering sub antenna signal conditioning circuit will be launched the pen emission converts a level jumping edge to, level is jumped along the interruptable controller that triggers central processing unit, wake central processing unit up, central authorities handle the work that restarts, after central processing unit confirms that the wireless signal transmission pen lifts and do not have need of work to handle, central processing unit enables to trigger sub antenna, another enters dormant state, when not having click action, central processing unit is in dormant state as can be seen, has significantly reduced system power dissipation.

Triggering sub antenna can have various ways to select, as shown in Figure 3, it preferably triggers the sub antenna connected mode is the toroidal conductor that overlaps substantially with wireless signal receiving antenna array functional area edge, compares with other forms of triggering sub antenna that its signal intensity is big, manufacture craft is simple.

The effect that triggers the sub antenna signal conditioning circuit is that the keyed amplitude modulation conversion of signals with the wireless transmit pen becomes square-wave signal, be wireless transmit pen emission wireless signal and trigger the sub antenna signal conditioning circuit when not transmitting and export different level, thereby when click action, can produce a jumping edge that is used to wake up central processing unit, it has two kinds of preferred versions, the first is used the detection shaping circuit, its advantage is that the enlargement factor to signal is lower in the total system, the fundamental frequency of amplitude-modulated signal need not be amplified to square wave, be difficult for producing parasitic concussion, the pcb plate is easy to design, its two uses phase-locked loop frequency catching circuits, its advantage is that environment interference is strong; Described detection shaping circuit master chip uses LM324 and replaces the model chip, be characterized in that power consumption is lower, cheap, low voltage operating, described phase-locked loop frequency catching circuits master chip uses CD4046 and replaces the model chip, is characterized in that power consumption is very low; Wherein " replacement model " is meant that electric property is identical, and causes the different model of title because of producer's difference.

Described wireless signal receiving antenna array, be printed on the plastic base, comprise the anti-interference screen layer of a reticulate texture, anti-interference screen layer is and the position sub antenna, trigger the stratum that sub antenna directly is not electrically connected, the effect of anti-interference screen layer is that shielding is applied to the position sub antenna by capacitive coupling, trigger the interfering noise on the sub antenna, the particularly interference of hand, because the more intense meeting of eddy effect of plane earth makes the decay that transmits of wireless transmit pen serious, large-area again floor file meeting increases cost of manufacture, so the cabling of screen layer uses reticulate texture, the design of grid is as the criterion can cover the position sub antenna, it is a lot of that signal to noise ratio (S/N ratio) is improved, and the stability of a position transducer is strengthened, precision improves.

The described wireless signal receiving antenna array that has the anti-interference screen layer of reticulate texture, use the printing of carbon slurry, owing to used the mesh shields layer that antijamming capability is strengthened greatly, can also think has increased the wireless signal receiving antenna array of mesh shields layer to disturbing rejection too superior, can disturb relevant design objective to relax with suppressing to other, it is exactly the resistivity of position sub antenna that relevant design objective is disturbed in one of them important inhibition, resistivity to the position sub antenna requires to have descended, just can starch printing wireless signal receiving antenna array by the cheaper carbon of use cost, reduce cost.

In the utility model, described wireless signal receiving antenna array, offset size between its position sub antenna is 5 times of position sub antenna width, with the offset size of position sub antenna in the existing scheme is that 3 times of position sub antenna width are compared, the useful data that samples in one click is many, the height and the pitch angle information of pen have been increased in the sampled data, height and pitch angle information when wireless signal transmission pen that sensor can accurately survey is clicked, thus degree of accuracy under wireless signal transmission pen inclination click situation improved.

The wireless signal transmission pen that this use is novel adopts the talking pen of band piezoelectric pressure indicator, because the dynamics of its click is little, the stroke of nib is little, uses feel number, more meets use habit.

Sum up wireless talking pen of the present utility model, following advantage arranged:

Power consumption is little, antijamming capability is strong, cost is low, degree of accuracy is high, good hand touch, but the height and the degree of tilt of cognitive radio emission pen.

Description of drawings:

Fig. 1 the utility model theory diagram

Fig. 2 wireless signal receiving antenna array is hidden the plate figure of screen layer

Fig. 3 triggers the sub antenna outside drawing

Fig. 4 master chip uses the detection shaping circuit figure of LM324

Fig. 5 master chip uses the phase-locked loop frequency catching circuits figure of CD4046

The line outside drawing of the anti-interference screen layer of Fig. 6 reticulate texture

The mutual alignment graph of a relation of Fig. 7 position sub antenna

Embodiment:

Instantiation of the present utility model is described below:

As shown in Figure 1, the wireless transmit pen is launched wireless signal when the user has click action, a sub-antenna receiving signal in the central processing unit specific radio signal receiving antenna array, and the wireless signal that receives passed through connector, analog switch is given the amplifying circuit of wireless signal receiver, amplifying circuit amplifies the signal that receives, noise and signal and deposit in the amplifier output signal, amplifier output is connected to wave filter, wave filter is with noise-filtering, clean signal is delivered to the wave detector detection, wave detector amplifies the peak value output that detects through amplifier 2 gives central processing unit, central processing unit uses its analog to digital converter to measure its value, so far a sampled data is finished, central processing unit enables a position sub antenna by the control analog switch as required again and repeats above process then, up to all data acquisitions are finished, next central processing unit is analyzed resulting data and is converted thereof into coordinate data, directly sends to the multimedia processor by serial ports.

By top description as can be seen, the process of the processing procedure of wireless signal and AM receiver, keyed amplitude modulation modulation remote-control receiver is basic identical, and in the open source information that existing point reader, board scheme are correlated with, description is arranged more, at this tired no longer in detail known technology of stating this area, the scheme that the slip-stick artist of this area can describe in conjunction with the utility model in the scheme of its grasp fully obtains the beneficial effect that the utility model is mentioned.

As shown in Figure 1, output terminal at wave filter also is connected with triggering sub antenna signal conditioning circuit, when the central processing unit dormancy, its control analog switch will trigger sub antenna and be connected on as shown in Figure 1 the amplifier 1, the effect that triggers the sub antenna signal conditioning circuit is to convert high-low level with what its front end sent to by the keyed amplitude modulation ripple, for providing the interruption that wakes up, the central processing unit of dormant state jumps the edge, trigger the sub antenna signal conditioning circuit two kinds of preferred implementation methods can be arranged, first master chip as shown in Figure 4 uses the detection shaping circuit of LM324, and first master chip as shown in Figure 5 uses the phase-locked loop frequency catching circuits of CD4046.

Master chip as shown in Figure 4 uses the detection shaping circuit of LM324, the input of input end (41) be to amplify through prime, the keyed amplitude modulation signal of filtering, through R43, R44, R45, Q2, the computing wave detector detection that C8 forms, form the identical keying signal of peak envelope shape with input (41), operational amplifier (43) is to penetrate a grade follower, play the effect of impedance conversion, the input and output waveform is constant, amplifier (45), C1, R32, R33 forms every straight sign-changing amplifier, amplify with the keying signal direct current biasing replacement of prime and with AC signal, amplifier (44), R37, R38, R39 forms the comparer that has hysteresis voltage, the keying envelope signal is shaped as square wave, and output (42) is linked to the interruption pin of central processing unit; Wherein amplifier (43), amplifier (44), amplifier (45) are with being on the LM324 chip; Consider the utilization factor of circuit, computing wave detector inspection that R43, R44, R45, Q2, C8 form and operational amplifier (43) and wave detector shown in Figure 1 are shared.

Master chip as shown in Figure 5 uses the phase-locked loop frequency catching circuits of CD4046, the typical case of CD4046 uses, the input of input end (51) be through prime amplify, the keyed amplitude modulation signal of filtering, if the frequency of keying signal drops within the frequency range of the frequency selection network of being made up of R1, R2, C1, and amplitude is during greater than 100mV, output terminal (52) is then exported high level, when keyed amplitude modulation blackout output terminal (52) output low level then then, output (52) is linked to the interruption pin of central processing unit; Because have two phase comparator functions identical among the CD4046, it is not 10 pin (54) of CD4046 and 20 pin (53) of CD4046 that its output is put, to change to connection 10 pin functions constant so R3 connects an end of 20 pin of CD4046.

As shown in Figure 3, be to trigger the sub antenna outside drawing, the black line that adds that wherein splicing ear (31) connects is to trigger sub antenna, its edge along the position sub antenna forms loop configuration.

Shown in Figure 6 is the line outside drawing of the anti-interference screen layer of reticulate texture, the anti-interference screen layer of reticulate texture is connected to ground, sub antenna contrast with wireless signal receiving antenna array shown in Figure 2, their shapes are identical, and each sub antenna of receiving antenna array all is capped, and it should be noted that screen layer will be on sub antenna when the wireless signal receiving antenna array was installed, be that screen layer will so just can better play shielding action more near hand.

The mutual alignment graph of a relation of position sub antenna as shown in Figure 7, be four position sub antennas in the lower right corner of wireless signal receiving antenna array shown in Figure 2, the width of the horizontal level sub antenna of wireless signal receiving antenna array (73,74), vertical position sub antenna (71,72) is identical as shown in Figure 7, the relativity shift of adjacent position sub antenna is measure-alike, and its offset dimensions is 1/5 of position sub antenna width approximately.

The concrete condition of talking pen sees also the utility model patent of the patent No. for " 2008200945913 ".

Finish

Claims

1, a kind of position transducer comprises wireless signal transmission pen, wireless signal receiving antenna array and wireless signal receiver; It is characterized in that:

Described wireless signal receiving antenna array comprises the triggering sub antenna;

Described wireless signal receiver comprises triggering sub antenna signal conditioning circuit.

2, according to claim 1 position transducer is characterized in that, described triggering sub antenna is the toroidal conductor that overlaps substantially with wireless signal receiving antenna array functional area edge.

3, according to claim 1 position transducer is characterized in that, the triggering sub antenna signal conditioning circuit of described wireless signal receiver uses the detection shaping circuit.

4, according to claim 3 position transducer is characterized in that, the master chip of described detection shaping circuit uses LM324 and replaces the model chip.

5, according to claim 1 position transducer is characterized in that, the triggering sub antenna signal conditioning circuit of described wireless signal receiver uses the phase-locked loop frequency catching circuits.

6, according to claim 5 position transducer is characterized in that, described phase-locked loop frequency catching circuits master chip uses CD4046 and replaces the model chip.

7, according to claim 1 position transducer is characterized in that, described wireless signal receiving antenna array comprises the anti-interference screen layer of a reticulate texture.

8, according to claim 7 position transducer is characterized in that, described wireless signal receiving antenna array is the plastic basis material printed-wiring board (PWB) of carbon slurry for the link material printing.

9, according to claim 1 position transducer is characterized in that, described wireless signal receiving antenna array, and the offset size between its position sub antenna is 1/5 of a sub antenna width.

10, according to claim 1 position transducer is characterized in that, described wireless signal transmission pen uses the talking pen of being with piezoelectric pressure indicator.