CN1164064A

CN1164064A - Frame-type coordinate setting apparatus

Info

Publication number: CN1164064A
Application number: CN 96104912
Authority: CN
Inventors: 高刚
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-30
Filing date: 1996-04-30
Publication date: 1997-11-05

Abstract

A frame-type coordinate location device for inputting X and Y coordinate information on a plane to computer features that it is based on electromagnetic induction principle, the 4 edges of a frame is composed of inductance coils which is able to receive electromagnetic wave signals, and receives the signals sent from a small transmitter and then it send the signals to a circuit for processing; the processed analog signals are directly input via game port to computer, where the coordinate position of small transmitter can be found out based on the amplitudes of the signals received by coils. Said locator can be used as mouse mark, joystick, touch screen and handwriting board of computer. It possesses simple structure and low cost.

Description

Frame-type coordinate setting apparatus

It is a kind of device with the co-ordinate position information input computing machine of mobile thing in the hand.

Present coordinate entering device has and utilizes invention such as the different principle that press principle, electromagnetic induction principle, magnetostriction principle." touch-screen " that for example utilize transparent membrane to invent reaches " hand writing Chinese character timing input device and on-line identification method " number of patent application 89102095.0 etc. and utilizes exactly and press principle.Utilize " position detector " CN88103289.A of magnetostriction principle development, its complex structure, cost are also higher.The coordinate entering device of this two kinds of principles development is different with this invention on principle.This frame-type coordinate setting apparatus utilizes the electromagnetic induction principle invention.

Utilizing " coordinate entering device " number of patent application 91103786. and " flexible digitizer tablet " number of patent application 92101845.2 of electromagnetic induction principle invention, is to adopt the method for coordinate scanning collection coordinate position in length and breadth.Other has a kind of " dot coordinate input device " number of patent application 94117724.6 that utilizes the electromagnetic induction principle invention, is the method that adopts three-point fix.Although all be the electromagnetic induction principle that utilizes, its method is different with this invention." coordinate entering device " its principle that puts goods on the market in a large number is identical with digitizer with method, so the bearing accuracy height, and reliability is also better.Just, therefore influenced the speed of its coordinate acquisition information because it adopts coordinate scanning collection coordinate position in length and breadth.Utilize this device to gather the person's handwriting of handwritten Chinese character, when the speed of wieling the pen is very fast, with the lost part handwriting information.Although " dot coordinate input device " collection position coordinate speed is fast, it determines that x, the y coordinate on plane need carry out the coordinate information and linear calculating of 3 of the sequential collections of Single-chip Controlling.It can not directly import computing machine with x, the y coordinate on plane, also needs through calculating conversion.

At the problems referred to above, the invention reside in provides a kind of cheap, the frame-type coordinate setting apparatus that serves many purposes.Though this invention also is to have utilized electromagnetic induction principle, its method is to utilize the electromagnetic wave of the fixed frequency of launching in launching electromagnetic wave device of telefault reception of periphery.Because the coil of launching electromagnetic wave is different with the distance of square frame perimeter induction coil in the emitter, the amplitude of launching electromagnetic wave in the telefault receiving and transmitting unit on each limit of square frame is not waited.Can determine the coordinate position of emitter according to the size that receives the electromagnetic wave amplitude.

A concrete embodiment of this orientator is that 4 strip square coils are made a square frame or rectangle frame as figure (1) as 4 limits.In order to reduce edge effect, the scope of activities that can make emitter is less than square frame, promptly in the empty frame scope in the drawings.The limit of the real frame of the back gauge of empty frame is 5～10mm.The two ends of forming each strip square coil on square frame 4 limits need add a foil 2, with the electromagnetic wave at potted coil two ends, can reduce by 4 phase mutual interference between telefault like this.

The device of launching electromagnetic wave is a LC oscillatory circuit, shown in figure (2).The resonance frequency of this circuit is selected in 200khz～800khz frequency range.This emitter is by the coil launching electromagnetic wave.The circuit of this emitter is comparatively simple, and it is very little that volume can be done, and therefore can be contained in the pen, also can make the finger shell-like.

The wave frequency of launching in each bar shaped coil and the composition of the C* in the circuit 8 LC oscillatory circuit of forming 4 limits of square frame, its resonance frequency and emitter is identical, and its frequency can be adjusted in 200KHz～800kHz scope.If the frequency of selecting is high more, the distance of received signal is just far away more, and it is big more that the area of square frame just can be manufactured.When just frequency is high, require the performance of the operational amplifier U in the treatment circuit to want better.At the area of square frame less than 500cm ²The time, get final product with general universal amplifier.

Signal processing circuit 8 as figure (3) are made up of 4 parts, and first is that the preceding utmost point amplifies empty frame 4; Second portion is the empty frame 5 of Nonlinear Processing; Third part is to transfer AC signal to direct current signal empty frame 6; The 4th part is the empty frame 7 of power amplification.Signal after the power amplification is directly inputted to the game port of computing machine the most at last, need not to carry out the purpose that analog to digital conversion can realize coordinate information input computing machine, and its analog to digital conversion is to be finished by the multifunction card of computing machine.

The processing procedure of forming 4 strip square coil 1 received signals of square frame is the same, so the treatment circuit of other three bar shaped coil received signals is identical with the circuit 8 of figure (3).Each road signal is through being directly inputted to the game port of computing machine after the power amplification, the game port of computing machine has the signal input part of two couples of x, y coordinate, so 4 road signals of strip square coil can be input in the computing machine simultaneously.After computing machine received 4 road signals, by computer software with 4 road signaling zones separately, the coordinate position that can obtain emitter was handled in the row operation of going forward side by side.

Because the analog to digital conversion in this invention is realized by computer-internal, and saved the control of single-chip microcomputer and carried out communication by game port and computing machine, therefore simplified the communication protocol of this orientator and computing machine, make it simple in structure, gather with the transmission of coordinate information rate fast, reliability is higher, and is with low cost, is easy to manufacture.This invention is considered the ripple processing owing to can carry out software, and the instability of signal is solved.This orientator is the computer software driver of exploitation at present, makes it can be used as mouse, pick-up sticks, handwriting pad, uses such as touch-screen and large-area coordinate tablet.Realized the multiple use of this invention.

Claims

1, a kind of multiduty frame coordinate setting orientator comprises strip rectangle receiving coil 1; Emitter 3; Treatment circuit 8.

2, strip rectangle receiving coil 1 according to claim 1 is characterised in that two ends are equipped with the sheet metal 2 of shielding electromagnetic wave.

3, strip square coil according to claim 1 and 2 is characterised in that the identical coil of frequency that its resonance frequency and emitter 3 are launched.

4, be characterised in that according to claim 1 or 3 described strip square coils and vertically be mounted to a square frame mutually.

5, treatment circuit 8 according to claim 1 is characterised in that circuit 4,5,6,7 is connected into an integrated circuit.

6, emitter 3 according to claim 1 is characterised in that the electromagnetic wave LC resonant circuit 3 that transmission frequency is selected in 200KHz～800kHz scope.

7, LC resonant circuit 3 according to claim 7 is characterised in that the telefault of launching electromagnetic wave is one and is installed in the writing end of pen or is enclosed within coil on the finger.