CN204009766U - Integrated tactile keyboard - Google Patents

Abstract

Integrated tactile keyboard, belong to electronic technology field, by keypad skeleton, keyboard, OR circuit, oscillator-amplification circuit, operation circuit in keypad forms jointly, each button will connect an output of OR circuit, or door output connects oscillator-amplification circuit, OR circuit and oscillator-amplification circuit are selected after integrated technique, put in button skeleton with together with operation circuit in keypad, form a kind of tactile keyboard matching with computer, when hand contact keyboard, the touch signal producing, through oscillator-amplification circuit, signal is amplified, success encourages the operation circuit in keypad, after each measure is implemented, there is not card key, button cannot involution after pressing etc. problem, the function of General Promotion keyboard, for the development of computer provides basic guarantee.

Description

Integrated tactile keyboard

Technical field

Belong to electronic technology field.

Background technology

Science and technology is flourishing now, computer is also constantly promoting and development, laptop computer has had touch-screen, its benefit is to carry, on-keyboard, the accessories such as mouse, but shortcoming is typing document inconvenience, because its on-keyboard, when a lot of capsule information of typing, still use the good input character of keyboard, computor-keyboard of today, great majority are all mechanical types, after more or less all can running into button when people use and pressing, cannot involution, or button firmly, just can obtain these situations such as the result that we want mutually, button cannot involution, computer can show and daps, if in processing document, bring great trouble, people wish simple and convenient with computer exactly, if use uncomfortablely because of the problem of keyboard, can lose more than gain, to thoroughly eradicate this situation, can only eradicate this physical construction of keyboard, be that key is pressed rear downwards, fulfil again and pop up recovery routine without key.Also be that keyboard is innovated thoroughly, mechanical key structure that both need not be such, also need not this simple on-off mode.Thereby the place relating to is many, need to solve a multiple technologies difficult problem.

Summary of the invention

Fundamental purpose of the present utility model is to propose a kind of new measure, forms a kind of tactile keyboard matching with computer, and it is entirely touch,, there is not card key in machinery-free button, button cannot involution after pressing etc. problem, the function of General Promotion keyboard, for the development of computer provides basic guarantee.

The technical solution used in the present invention is:

1, integrated tactile keyboard is by keypad skeleton, keyboard, and OR circuit, oscillator-amplification circuit, the operation circuit in keypad forms jointly.

Wherein: the extension line of keyboard connects the input of OR circuit, after a commissure electric capacity of output series winding of OR circuit, connect oscillatory circuit in integrated amplification early warning circuit pin.

Integrated amplification early warning circuit is made up of jointly oscillatory circuit, amplifying circuit, gauge tap and electronic relay.

Gauge tap is made up of NPN triode and PNP triode.

The output of OR circuit connects oscillatory circuit pin, oscillatory circuit pin and VDD pin connect power supply, the CV pin of oscillatory circuit is practiced midwifery second electric capacity of raw vibration to ground, and the TH pin of oscillatory circuit connects two-way, and a road is to practice midwifery the resistance of raw vibration to power supply, raw first electric capacity vibrating is practiced midwifery to ground in another road, and the OUT pin of oscillatory circuit is preposition output.

Preposition output connects an anti-interference capacitor and sensitivity adjustment resistance over the ground, the preposition output of positive termination of amplifying circuit, the end of oppisite phase of amplifying circuit and the output of amplifying circuit are joined, the output of amplifying circuit connects the input of gauge tap, it is the base stage of NPN triode, the grounded emitter of NPN triode, after a resistance of collector connection of NPN triode, arrive the base stage of PNP triode, the emitter of PNP triode connects power supply, the collector of PNP triode is the output of gauge tap, the control line bud of connecting electronic relay.

Two contacts of electronic relay become the output of oscillator-amplification circuit, have connected the operation circuit in keypad.

All circuit use integrated technique, then put in touch-key dish skeleton.

2, the each button on keyboard connects respectively the input of OR circuit, connects oscillatory circuit in integrated amplification early warning circuit after a commissure electric capacity of the output of OR circuit series winding pin.

3, oscillatory circuit is made up of 555 integrated circuit.

4, electronic relay is bidirectional analog switch CD4066.

The now meaning to each technical measures of the present invention, concrete condition is further explained as follows:

One, the explanation of oscillator-amplification circuit:

When hand contact keyboard, touch signal is through electric capacity, this electric capacity is or door is exported the commissure electric capacity (03 in Fig. 1) between oscillatory circuit, enter oscillatory circuit inside, produce accurate vibration, cause vibration failure of oscillation or seriously change, the OUT pin that makes oscillatory circuit is that preposition output (08 in Fig. 1) has high-order output.This high-order output excitation gauge tap after amplifying circuit (011 in Fig. 1), opens electronic relay (015 in Fig. 1), the operation circuit in excitation keyboard.

(1), oscillatory circuit is reliable, touch-sensitive, in the present invention of its reason, oscillatory circuit is not in the time having touch signal, oscillatory circuit is in vibrational stabilization state, and when having after touch signal, great change must occur oscillatory work state, output terminal must have high-order output.The output terminal ground capacitance of oscillatory circuit has interference effect, has improved this grade of performance from another angle.Oscillatory circuit is being structurally combined into of mimic channel and digital circuit, and analog functuion and logic function compatibility are integrated, and produces vibration accurately, can share a power supply with amplifying circuit, and oscillatory circuit maximum output current 200mA, carrying load ability is strong, and use is reliable, the life-span is long.

(2), amplifying circuit has outstanding performance.Enlargement factor than discrete component is much bigger, and therefore, when after hand contact lockhole cover plate, oscillatory circuit has output, through the amplification of amplifying circuit, triggers gauge tap, starts electronic relay, and electronic relay is connected, thus the operation circuit in excitation keyboard.

The fine adjustment of sensitivity of amplifying circuit, sensitivity adjustment resistance (010 in Fig. 1) resistance is large, its sensitivity step-down, resistance is little, sensitivity raises, and has very strong adjustable, compared with the amplifying circuit of discrete component, circuit is simpler, adjusts more conveniently, and performance is stronger.

Two, produce the physical process of touch key-press formation break-make:

In the time of button corresponding to finger contact, the touch signal of human body is after amplifying, and line bag that completely can excited electrons relay also makes it to produce high-order, and result is that the normally opened contact that electronic relay line bag is corresponding changes connection into by often opening like this.Due to the two ends of normally opened contact, connected two line ends that the corresponding keyswitch of former mechanical keyboard connects, so while adopting hand to touch contact, with adopt mechanical key downwards by effect be equal to.Otherwise in the time that hand pine is pasted button, or while leaving button, its touch signal is very weak, electronic relay disconnects, and is equivalent to mechanical key and upwards recovers the effect disconnecting.

The electronic relay using in measure 1 is bidirectional analog switch (016 in Fig. 1) CD4066, in the time that control end adds high level, and switch connection, on-impedance is lower, and in addition, on-impedance is substantially constant in whole input reference signal.Eliminated the variation of switching transistor threshold voltage with input signal, therefore within the scope of whole working signal, on-impedance is lower.Compared with single channel switch, have that input signal peak voltage ranges equals supply voltage and the advantage such as on-impedance is more stable in input reference signal.Switch cut-off in the time that control end adds low level.When analog switch is connected, connecting resistance is tens ohm; When analog switch cut-off, present very high impedance, can become open circuit.Analog switch can transmission of digital signals and simulating signal, and the upper limiting frequency of the simulating signal that can transmit is 40MHz.That analog switch has possessed is low in energy consumption, speed fast, machinery-free contact, volume are little and the advantage such as long service life.

Three, the feature of OR circuit is: one of them input end has signal, output terminal just has output signal so, Here it is or, as long as meet one of them condition of input end, that output terminal just has result, by OR circuit, also played buffer action, each button can not be influenced each other, OR circuit is without debugging, reduce volume, be convenient to install.

After the invention process, promoted the security performance of anti-theft safety door, outstanding advantage is as follows:

1, Computer key dish no longer produces card key, blunt situation, makes user use more comfortablely.

2, keyboard volume diminishes, and particularly becomes very thin, because button does not need the program of upwards involution, therefore can save the distance of the downward motion of button.

3, make also high-technicalization of keyboard, be equivalent to the handset touch panel that people use, fashion is generous.

4, the life-span of keyboard can improve, because there is no original product button needed " spring " in computer dish.

5, good production, because required electronic component, without particular/special requirement, particularly each unit is made after integrated just simplyr, each button can not influence each other.

6, oscillator-amplification circuit carrying load ability is strong, use reliable, the life-span is long, compared with the amplifying circuit of discrete component, circuit is simpler, adjusts more conveniently, performance is stronger.

Brief description of the drawings

Fig. 1 is oscillator-amplification circuit figure.

In figure: 01, a button extension line in keyboard; 02, OR circuit; 03, commissure electric capacity; 04, produce the resistance of vibration; 05, produce first electric capacity of vibration; 06, oscillatory circuit; 07, produce second electric capacity of vibration; 08, the output of oscillatory circuit; 09, anti-interference capacitor; 010, sensitivity adjustment resistance; 011, amplifying circuit; 012, anti-interference resistance; 013, NPN triode; 014, the resistance between NPN transistor collector and PNP transistor base; 015, PNP triode; 016, electronic relay; 018, the normally opened contact of electronic relay, the i.e. output of oscillator-amplification circuit.

Fig. 2 is overall frame assumption diagram.

In figure: 02, OR circuit; 018, the normally opened contact of electronic relay, the i.e. output of oscillator-amplification circuit; 200, keypad mechanical keyboard skeleton; 201, the button of keyboard; 202, oscillator-amplification circuit; 203, the operation circuit in keypad.

Embodiment

Fig. 1 and Fig. 2 have described specific embodiment of the invention example.

One, option:

Oscillatory circuit is 555 integrated circuit, and amplifying circuit is selected LM324, and electronic relay adopts 4066, and resistance is without particular/special requirement.

Two, welding:

(1), the simulation of separation member welding.

1, weld oscillator-amplification circuit according to Fig. 1.

2, the button of keypad after connecting, wire is connected on oscillator-amplification circuit.

3, the two ends lead-in wire of electronic relay normally opened contact is connected on the operation circuit in keypad.

(2) oscillator-amplification circuit is made the facture of integrated circuit.

Each one of keyed jointing or an input or door output pressed is connected with the in-phase end of the first operational amplifier, and OR circuit and oscillator-amplification circuit are made to integrated form, and sensitivity adjustment resistance, not in integrated form, should weld separately.

2, the output of oscillator-amplification circuit is connected on the operation circuit in keypad.

Three, debugging.

Test and adjustment oscillatory circuit: survey the OUT pin of integrated circuit with the voltage gear of multimeter, when hand does not contact button, oscillatory circuit pin is output as low level, below 0.5 volt, and in the time of hand contact button, oscillatory circuit pin should be exported a high position, the nonconforming resistor-capacitor unit value that should adjust oscillatory circuit.

Test and adjustment amplifier stage: with the collector of voltage table observing and controlling triode processed, in the time that vibration is output as low level, gauge tap is output as low level, it is the very low level of current collection of PNP triode, in the time that vibration is output as a high position, gauge tap is output as a high position, and the current collection of PNP triode is very high-order, as insufficient sensitivity, should adjust sensitive adjusting resistance.

Four, install:

Button is put into touch-key dish mechanical keyboard skeleton with together with operation circuit in oscillator-amplification circuit, keypad after integrated.

Claims (4)

1. integrated tactile keyboard, is characterized in that: by keypad skeleton, and keyboard, OR circuit, oscillator-amplification circuit, the operation circuit in keypad forms jointly:

Wherein: the extension line of keyboard connects the input of OR circuit, after a commissure electric capacity of output series winding of OR circuit, connect oscillatory circuit in integrated amplification early warning circuit pin;

Integrated amplification early warning circuit is made up of jointly oscillatory circuit, amplifying circuit, gauge tap and electronic relay;

Gauge tap is made up of NPN triode and PNP triode;

The output of OR circuit connects oscillatory circuit pin, oscillatory circuit pin and VDD pin connect power supply, the CV pin of oscillatory circuit is practiced midwifery second electric capacity of raw vibration to ground, and the TH pin of oscillatory circuit connects two-way, and a road is to practice midwifery the resistance of raw vibration to power supply, raw first electric capacity vibrating is practiced midwifery to ground in another road, and the OUT pin of oscillatory circuit is preposition output;

Preposition output connects an anti-interference capacitor and sensitivity adjustment resistance over the ground, the preposition output of positive termination of amplifying circuit, the end of oppisite phase of amplifying circuit and the output of amplifying circuit are joined, the output of amplifying circuit connects the input of gauge tap, it is the base stage of NPN triode, the grounded emitter of NPN triode, after a resistance of collector connection of NPN triode, arrive the base stage of PNP triode, the emitter of PNP triode connects power supply, the collector of PNP triode is the output of gauge tap, the control line bud of connecting electronic relay;

Two contacts of electronic relay become the output of oscillator-amplification circuit, have connected the operation circuit in keypad;

All circuit use integrated technique, then put in touch-key dish skeleton.

2. integrated tactile keyboard according to claim 1, is characterized in that: the each button on keyboard connects respectively the input of OR circuit, connects oscillatory circuit in integrated amplification early warning circuit after a commissure electric capacity of the output of OR circuit series winding pin.

3. integrated tactile keyboard according to claim 1, is characterized in that: oscillatory circuit is made up of 555 integrated circuit.

4. integrated tactile keyboard according to claim 1, is characterized in that: electronic relay is bidirectional analog switch CD4066.