CN2204436Y

CN2204436Y - Computer handwriting imput plate

Info

Publication number: CN2204436Y
Application number: CN 94243122
Authority: CN
Inventors: 樊志洪; 王翔宇
Original assignee: Shenzhen New China Emperor Electronics Co Ltd
Current assignee: Shenzhen New China Emperor Electronics Co Ltd
Priority date: 1994-10-14
Filing date: 1994-10-14
Publication date: 1995-08-02
Anticipated expiration: 2004-10-14

Abstract

The utility model relates to a computer handwriting input plate, comprising a handwriting input plate body (1) and a handwriting pen (2). A handwriting input area (3), a power supply indicator light (4) and a working state indicator light (5) are arranged on the surface of the handwriting input plate body (1). The computer handwriting input plate is characterized in that the collection and input of pen signals adopt an electromagnetic induction mode; the handwriting pen (2) which is composed of the button switch which is composed of inductance coils and conductive films is connected with the handwriting input plate body (1); the pen signal collection and input part is composed of a plurality of conducting wires whose longitudinal directions and transverse directions are respectively positioned on the two surfaces of a printed circuit board and are distributed uniformly, an analog multi-way switch and a decoder. The handwriting input need not be contacted with the input plate, the handwriting pen and the input plate have no wear, the input is easy and free, the sensitivity is good, and the work efficiency is high.

Description

Computer handwriting imput plate

Existing computer input system, the mode that adopts keyboard to import mostly for the input of Chinese character, then needs through special training.Occurred a kind of computer writing input board such as Chinese king pen in recent years, the user, can identify in this Chinese character and the reader by the Chinese character recognition software of special use as long as write the Chinese character of desiring in the reader with pen by hand-written mode on writing input board.Any user need not train, need not remember numerous and diverse coding yet, can be convenient to use.This writing input board comprises writing input board body and writing pencil.The surface of writing input board body is provided with a square handwriting input district, i.e. pressure sensitive district.Be provided with a signal (pressure) in the writing input board body and gather importation, microprocessor, analog linearity amplifier section, A/D conversion portion.The generation of a position signalling of this tablet is that employing is a kind of with mechanical pressure position difference, the force-sensing parts that the resistance of device also changes thereupon.Because the resistance of force-sensing parts is to change with pressure, when therefore writing with pen, hand need exert oneself can effectively import more greatly, and insensitive, input efficiency is low.Write for a long time, hand has tingle sense, makes people's fatigue, not as people's will, influences people's use confidence.It only is a same object of hard similar pen, on the pen without any other original paper.The also available hand of this plate is write.

The purpose of this utility model is: the above-mentioned deficiency at existing " Chinese king pen " computer writing input board, and provide a kind of handwriting input free and relaxed, sensitivity is good, the computer writing input board that efficient is high.

The hand-written book tablet of computer of the present utility model it is characterized in that described signals collecting importation lay respectively at by direction in length and breadth printed circuit board (PCB) two surfaces some equally distributed leads and with these analog multichannel switches of being connected of lead and these lines are composed respectively with the address decoder of different address values form in length and breadth.Alternating magnetic field signal on the pen is by the mode of electromagnetic induction, and lotus root is bonded on the line of induction of X and Y.

The A/D conversion portion of described counter mode is made up of a line integral device, two heuristicimal counters, a voltage comparator, with an induced voltage signal that is inversely proportional to distance, convert signal integral time to the induced voltage inverse ratio, therefore with distance proportional relationship, the present invention just being arranged integral time is exactly the A/D conversion that utilizes this principle to realize.

Described writing pencil is to be made of the pushbutton switch that a telefault and two conductive films constitute, writing pencil links to each other with the handwriting pad body, directly get the higher-order of oscillation current signal on the body, at the telefault that passes through on the pen, form a high frequency, alternating magnetic fields, the induced magnetism signal source when providing hand-written.

Be further described below in conjunction with the structure of accompanying drawing computer writing input board of the present utility model

Fig. 1 is the external structure synoptic diagram of computer writing input board of the present utility model

Fig. 2 is a signals collecting importation structural representation of computer writing input board of the present utility model

Fig. 3 is the A/D conversion portion structural representation of computer writing input board of the present utility model

Fig. 4 is that a signal of computer writing input board of the present utility model produces and a structural representation

Fig. 5 is the embodiment of computer writing input board of the present utility model

As shown in Figure 1, computer writing input board of the present utility model comprises writing input board body (1), and writing pencil (2).Be provided with a square handwriting input district (3) on the surface of writing input board body, a power light (4), a working station indicator (5).Writing pencil (2) is connected with an intrinsic high frequency signal generator branch by lead, in body, take out higher-order of oscillation current signal, again by the telefault on the pen, convert thereof into the alternating magnetic field signal of high frequency, as the signal source of a signals collecting importation of computer writing input board.

As shown in Figure 2, a signals collecting importation of computer writing input board of the present utility model is by the line of induction (VL1..VL32, HL1..HL32), address decoder (being U2 in embodiment Fig. 5), analog multichannel switch (being U11..U18 in embodiment Fig. 5), and four parts of microprocessor CPU (being U1 in embodiment Fig. 5) are formed jointly.Induction incoming line VL1 to ZL32(solid line) be positioned at the component side of printed circuit board (PCB), induction incoming line HL1 to HL32(dotted line) be positioned at the face of weld of printed circuit board (PCB).

As shown in Figure 3, the A/D conversion portion of computer writing input board of the present utility model is by integrator (being U7B in embodiment Fig. 5), voltage comparator (being U4B in embodiment Fig. 5), two heuristicimal counters (being U10A, U10B in embodiment Fig. 5), and the common A/D converter that constitutes a counter mode of four parts of microprocessor CPU.Integrator and voltage comparator are formed the counting and timing part of A/D conversion, and when the output of integrator during greater than the reference voltage of comparer, comparer is reversed to low level, makes counter stop counting immediately.Because counter is that a fixing clock frequency is counted, thus this counter as a quantification tool of gate time, its count value, i.e. clock periodicity has also just reflected the time length of counting.So CPU reads after this count value, can obtain the positional value of pen on handwriting pad by certain mathematical computations.

As shown in Figure 4, it is by a hexadecimal counter (being U8B in embodiment Fig. 5) that a signal of computer writing input board of the present utility model produces, after the address gating signal of microprocessor carried out 8 frequency divisions, deliver to (8) among Fig. 4 and (9) among resonant capacitance Fig. 4 on the telefault on the writing pencil again, when having on the telefault that so an alternating current flows through, will on coil, form an alternating magnetic fields, and when this alternating magnetic field when any one conductor, will on conductor, respond to the faint induced voltage of generation.And the power of induced voltage, be inversely proportional to the distance of magnetic field center and this conductor.The spring-loaded pushbutton switch of (6) among Fig. 4 for being connected with nib, (7) among Fig. 4 are and pen spring-loaded pushbutton switch on one's body.

The analog linearity amplifier section of computer writing input board of the present utility model can adopt arbitrary linear to amplify mode, as operational amplifier.

As shown in Figure 5, when a writing pencil as shown in Figure 4, during near the line of induction of a signals collecting importation shown in Figure 2, because a signals collecting importation is the longitudinal induction line (the solid line VL of Fig. 2) that is uniformly distributed in the original paper face of printed circuit board (PCB) by directions X, the Y direction is uniformly distributed in the transvercal induction line (the dotted line HL of Fig. 2) of the face of weld of printed circuit board (PCB), and these lines of induction is given address scrambler (2) composition of different Microprocessor Address.Microprocessor selects the different lines of induction and analog linearity amplifier section thereafter to link by selecting the mode of different addresses, and has relation one to one between the address and the line of induction.When pen when these lines of induction because the principle of electromagnetic induction, it will produce stronger induced voltages (this is made as V1 about 0.05mv) to its several close line of induction, to then very little from the induced voltage of its line of induction far away generation.Microprocessor is just by changing the mode of address like this, from the same directions X of X(Y direction principle of work) these lines of induction of scanning direction, when address (line of induction) influence electricity of selecting is cut down output when living, an expression position is away from this line of induction, need change a line of induction tries again, select the different lines of induction so successively, according to whether having induced voltage to produce, know pen is positioned at which bar line of induction on the plate (herein we establish it be the N bar line of induction), and induced voltage (this voltage is square wave), then after analogue amplifier amplifies (enlargement factor is that a fixed value is made as K), because this signal source is a square wave, this square-wave signal is still square-wave signal after amplifying, its value is V2=K*V1, and the square-wave signal after this amplifies is via the integrator (establish integral voltage and be output as V3) of Fig. 3, with the timer of voltage comparator composition, the control counter timer counter, this timing (being made as T) is directly proportional with the distance of pen to the N bar line of induction.With numeral be:

V3=∫ I*dt and I=V2/R, V2=K*V1

Because R is a certain value, to a fixed range V2, V3 is a constant simultaneously, so I also is a constant concerning a certain fixed position, so:

V3＝I＊t＝（（K＊V1）／R）＊t

V3 is along with time t increases with being directly proportional, and a reference voltage of V3 and thereafter voltage comparator compares, when the voltage of V3 during greater than this reference voltage, comparer is the voltage of output+5V just, make the A/D event counter that is subjected to its control stop counting, and the count value that stops hour counter is with the position of pen with the line of induction, present certain proportionate relationship, thereby calculate the distance D 1 of pen with respect to the N bar line of induction by its count value through a series of mathematical computations, this is the last address signal that draws X or Y again in conjunction with the line position N that produces this induced signal jointly of D1 as a result.

With numeral be: the converting digital that being made as X has induced signal generation (look-at-me) then to write down this line when N root line is that D1 then has:

X＝（N－1）＊D0＋D1

Wherein D0 is the spacing value between two adjacent lines, and this value determined by resolution, i.e. value during the full counting of A/D, this product D0 is 128(80H), so the resolution of this product is the X=0-3200 point, that is: ［ 25*128 ］, and the scope of D1 is 0-127

The coordinate that same address wire by monolithic and selection Y also can draw Y is ［ 0-3200 ］

The comparison of the utility model computer handwriting imput plate and Chinese king pen:

A, working method difference:

Chinese king pen is the piezo-resistance mode

The utility model computer handwriting imput plate is way of electromagnetic induction

B, sensitivity aspect:

Chinese king pen adopts piezoresistive element to constitute, and pressure-active element is a mean pressure of getting its stress surface, so precision is not high during work.

The utility model computer writing input board adopts way of electromagnetic induction work, its signal amplifying part branch has a bandpass filter, make it only allow that a signal of this characteristic frequency of signal passes through, and to amplify its hardware resolution be the 3200*3200 point, and total induction zone is the 7*7 square inch, so hardware resolution is 450 points/INCH, accurate positioning and interference are few.

C, the sensation when hand-written:

Chinese king pen is owing to adopt the pressure device, and is firmly bigger when hand-written, long-time hand-writtenly has a sensation that hand is ached, and nib and clipboard wearing and tearing are bigger.

The utility model computer writing input board adopts way of electromagnetic induction, and pen can be unsettled when writing, move to the noncontact mode, thus free and relaxed when mobile, do not feel effort at all, nib and clipboard wear and tear little.

Claims

1, a kind of computer writing input board, comprise writing input board body (1), and writing pencil (2), the surface of writing input board body is provided with a square handwriting input district (3), a power light (4), a working station indicator (5), be provided with a signals collecting importation in the writing input board body, microprocessor, the analog linearity amplifier section, the A/D conversion portion of counter mode, it is characterized in that described signals collecting importation is some the equally distributed lines of induction that laid respectively at two surfaces of printed circuit board (PCB) by direction in length and breadth, and with these analog multichannel switches of being connected of line of induction in length and breadth, form with the address decoder of these lines being composed respectively with different address values, alternating magnetic field signal on the pen is by the mode of electromagnetic induction, and lotus root is bonded on the line of induction; The A/D conversion portion of described counter mode is made up of a line integral device, two heuristicimal counters, a voltage comparator, with an induced voltage signal that is inversely proportional to distance, convert to the induced voltage inverse ratio integral time signal A/D conversion, the shell of described writing pencil and nib are the plastic colloid material, be connected with two spring-loaded pushbutton switches on it, a telefault and two spring-loaded pushbutton switches that conductive film constitutes are arranged in the pen, and writing pencil links to each other with the handwriting pad body.