CA2192230A1 - Electromagnetic sensitive switch - Google Patents

Electromagnetic sensitive switch

Info

Publication number
CA2192230A1
CA2192230A1 CA002192230A CA2192230A CA2192230A1 CA 2192230 A1 CA2192230 A1 CA 2192230A1 CA 002192230 A CA002192230 A CA 002192230A CA 2192230 A CA2192230 A CA 2192230A CA 2192230 A1 CA2192230 A1 CA 2192230A1
Authority
CA
Canada
Prior art keywords
signal
sensitive switch
recited
keyswitch
electromagnetic sensitive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002192230A
Other languages
French (fr)
Inventor
Rich Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Silitek Corp
Original Assignee
Silitek Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Silitek Corp filed Critical Silitek Corp
Priority to CA002192230A priority Critical patent/CA2192230A1/en
Priority to DE19652825A priority patent/DE19652825B4/en
Priority to FR9615941A priority patent/FR2757714B1/en
Publication of CA2192230A1 publication Critical patent/CA2192230A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965Switches controlled by moving an element forming part of the switch
    • H03K17/97Switches controlled by moving an element forming part of the switch using a magnetic movable element
    • H03K17/972Switches controlled by moving an element forming part of the switch using a magnetic movable element having a plurality of control members, e.g. keyboard
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes

Abstract

An electromagnetic sensitive switch is Provided. The sensibility of the On-Off status in a keyboad can be readily adjusted to meet different requirements from different user.
The CPU is incorporated with electronic circuit to control the peripheral equipment. The information can be input quickly without missing and incorrect words. This keyswitch features a linear and noiseless characteristic. Three conducting layers have been used to form the main substrate and cross-linked central portion for establish the position of word and symbol.
The program is embedded into the CPU. This is a novel design of keyswitch which is different from the keyswitch taught by prior art. The input can be performed accurately, quickly. By the way, the keyboard can be incorporated with a more compact design.

Description

219223~
- ELECTROMAGNETIC SENSITIVE SWITCH
Field of The Inve-ntion The Present relates to a keyswitch, more ParticularlY~
to an electromagnetic sensiti-ve switch suitable used on keYboard.
To the historY of the keYboard for computer, the earliest-one is mechanic On-Off tYpe, then a true-N-key is introduced, which belongs to depress-and-output tYpe. Regarding to the matrix of the keYboard, a short N keY is used.
The keYboard is used to inPUt information, there shall not anY missing word, including sYmbol. On the other hand, when the information is inPut in a quite high sPeed, there shall not any incorrect words. On the other hand, an excellent keyboard must be inherited with linear, without break Poin~ and noiseless.
Ln the prior art, there are a Plurality of keyboard which has a b-reak point, noise as well as non-linear. These can not be referred to as an excellent keYboard. In some keyboard, an diode is added into the matrix to establish an improvement to the ture-N-keY. In this kind of keYboard, it is contrPlled and adjusted bY the IC chiP, On-Off adiust circuit, and latching control. Then it maY has an excellent caPabilitY of few mistake.
Nevertheless, each keYswitch shall be incorPorated with an diode, accordingly, there are 108 ndiodes shall be aPPlied since there are 108 keYswitch ina standard keyboard. In light of this, not only will the cost increase tremendously, but will also bring difficulty during the manufacturing. By the way, it can not be ~ adaPted to~menbrane switches or plastic membrane.
In the Past, there is a caPacitor-tYPe keYswitch which includes an uPper conducting laYer, a contacting laYer and a lower conducting layer. Nevertheless, the manufacturing cost is high and the service life is short. Furthermore, it can be readilY influenced bY the moisture, consequentlY, it has a Poor stabilitY. AccordinglY, the keYswitch of caPaacitor tYpe has been phased out because of its cost and Poor function.
In the second tYPe of keyswitch, it is an electromagnetic tYpe which includes the PCB, iron core winding and amPlifYing winding. A through hole is disPosed in the middle Portion. This kind of keYswitch need a double side- PCB
and with manY a windi~ngs thereof. On the other hand, the large caPaeitance of caP-acitor means a high- cost. Accordingly, it has been phased out as well.
Right now, a three layers conductin-g me-mbrane has been apPlied for keYswitch, IBM's keYswitch is a tYPical one. In this design, the virtual N-keY is constructed and controlled by IC chip and controller. Nevertheless, it uses second auto scanning to correct the missing and incorrect words. But it still has a high manufacturing cost both on manufacturing and material.
SummarY of the Invention It is the obiect of this invention to Provide an electromagnetic sensitive keyswitch wherein the dePressing force exerted to each keyswtich can be readily adjusted to 219223~3 1 -lmprove t~he missing and incorrect input, I't is still the obiect of this invention wherein the make Point a-nd break point and the control to the circuit and mechanism have been modified to provide a more reliable inPut.
It is still the object of t-his invention wherein the On-Off status can be readily adjusted bY the,circuit and controller. Accordingly, an excellent keYboard is attained.
It is still the object of t'his invention wherein the upper and lower limits can be readily defined to establish the On and Off status.
-As shown in Figure 1. the electromagnetic sensitive switch comPrises a keyboard matrix scanning device 1, a analog multiPlexer device 2. a signal amPlifier 3, a signal triggering device 5, a break Point controller 4 during the oPeration, a signal latching and deleting dev-ice 6, a CPU 7, a decoder 8. an I/O connector 9, a resonator 10, an indicator display 11 and a current control device 12.
The operating PrinciPle of the electromagnetic sensitive switch is based on the following procedures.
SteP 1. the scanning of the key matrix is Performed bY
the scanning device, and a pluralitY of the keYs are scanned, not onlY a signle one;
Step 2, the scan is performed bY the I/O connector;
Step 3, feedback and read in. multi-exhange transmission is performed bY the multi-plexer 4051;
SteP 4, The OPA, current loop and voltage loop are 21g~23~ ' added for signal amPlification and sensibilit-Y enhancement;
SteP 5, signal adiustment is perfo'rmed to determine the On-Off uPPer-lower limits for signal retrieving;
SteP 6, the break Point controller can be adiusted, then bY the YR rheostat, the Pressing amPlitude o~f the on-off switch can be adjusted. The structure of this key will be specially designed. BY m~eans of this adiustment, a tailored amount can be a'ttained for a certain user; - -Step 7, the signal triggered by keYboard is Processed by the CPU;
Step 8, the feedback is used to delete the signalthrough the resonator. The transient status of the keyboard is deleted; and Step 9, the latch deYice is used to prevent surge wave, latching signal and dele~ting signal.
The electromagnetic sensitive switch can be concluded with the following features.
1. The conducting membrane has " multi-laYer "
configuration wherein the uPper conducting layer, the contacting layer and the lower conduction layer are all manufac~ured into a merbrane. In the middle portion, each of the keYswitch is incorPorated with a cross-linked two laYers of metal layer. When the keYswitch is depressed, the amPere's law will be aPPlied wherein the current takes 1~2 and the magnetic field takes 1/2. The CPU and scanning matrix will - ' select i-t.

2192~3~

~~ 2-. The correct character and symbol will be accurately selected bY the CP-U and Pertinent software;
3. D-uring the scann-ing process, the scanning device will read out al'l the dePressèd keYswitches simultaneously, not o-ne by one.
4. The keYswitch is featured with a DeBounce multi-rings caP. The keYswitch includes an uPPer and a lower - conducting layers spaced apart from each other--by an insulating laYer.
5. In the design, it includes a sPring, a lower housing enclosed with winding. -The middle Portion is a conducting membrane which has-an uPPer and lower metal layers.
The amPe-re's la-w is aPPlied in this case. The conducting membrane is disPosed on the sPring, as shown in Figure 3-1 and the sPring is porvided with a magnetic sensitive section formed bY carbon powder.
The feature shown in Figure 1 is further illustrated by Figure 2 which shows the circuitrY configuration. The signal Processing and described in more details as follows.
The signal is a current signal from the keY matrix. It passes 4051 IC and " oPerating amplifier ". The signal is amPlified and formed into an upper Peak and lower valley and then is adiusted by the varied rheostat. As it passes Scmffer trigging device, the lower limit is set at 0.84 volts and the upPer iimit is set at 1.7 volts.

219~23~

~ The present invention has ~he following advantage 1. There is no missing word;
2. It is line-ar and with excellent tactile'feeling;
3. The uPPer and lower limit of the On-Off states of the keyboard can be readilY adJusted;
4. No no-ise;
5. No loss of fidelity,-;
- 6. High working speed; and 7. With design character,istics different from the Prior art.
Brief DescriPtion of the Drawin~s In order that the present invention may more readily be understood the following description is given. esPeciallY
by way of examPle with reference to the accompanying drawings, in which Figure 1 is a sYstem block diagram of the electromagnetic sensitive switch made according to this invention;
Figure 2 is a sYstem block diagram of the function of the Potential-control made according to this invention;
' Figu-re 3-1 and 3-2 are the cross sectional view of the switch and the sYstem block diagram of the uP and down of the keyboard;
Figure 4 is a toP view of the conducting membrane keyboard of signle laYer; and Figure 5 is a sketch view of the keYtoP of a conducting membrane keYboard of single laYer.
Figure 1 includes keYboard matrix scanning device 1.
analog mu~tiplexer device 2, signal amPlifier 3, break Point controller 4 during the oPeration, signal triggering device 5, ~5 signal latching and deleting device 6, CPU 7. decoder 8, I/O
connector 9, resonator 10, indicator disPlaY 11 and current contro~ device 12.
-Figu-re 2 includes 4051 multiplexer 20, oPerating amPlifier 22, rheostat 23, schmitter triggering device 24.
10Figure 3 includes a Plastic sheet 30, spring 31, magnetic core 32 an-d resistance R.
Figure ~ includes an upper conducting membrane 3-3, keYswitch 34 and lower conducting membrane 35.
Figure 5 includes a plastic sheet 30. sPring 31. coil 1536, carbon Powder 37. Plunger 3~ and magnetic detecting portion 3g.
~etailed ~escri~tion of Preferred ~mbodiment ~ n the sYstem block diagram of the electromagnetic sensitive switch. the keyswitches are selected bY the aPPlication of the amPere~s law. The signal is selected, enhanced and amPlified by the multiP~exer. Then the signal Passes th signal triggering device to imProve the accuracY of th uPPer and lower limit Potential, then the Hi-Low can be readilY determined. Then the signal is Passed to the break Point controller adiusting On-Off device which is a brand new microProcessor control and does not aPPear ;n disclose bY the -' 2192230 _ prior art. Then the signal is passed to signal feedback device to imProve the stabilitY. Then the signal is passed to the signal 1atching delete device which is attained by dual-nand gate circuit. T-hen the signal is retrieved f-rom the signal latching delete device and is s-ent to CPU by the software and controller. BY this arrangement, the a stable signal can be attained for the indicator disPlay.
The arrangement of the present invention Provides a novel imProVement to the configuration of the keYswti~h and the circuit. for example, the base gate is pro-vided at the scanning portion and the stable Power suPPly is given for a stable inPut scanning.
As shown in Figure 2. the adjusting circuit is Provided to suit the accuracY of the mechanic structure to improve and adiust the Potential.
As shown in Figure 3-2, an accurate elements are provided. In Figure 3-2. the sPring is disPosed centrally to be inserted into the central single laYer o-f the conducting laYer. The single laYer of the keYswitch is formed by the upPer and lower conducting membranes. The winding of the keyswitch is disPose.d at the edge of the housing. The area beneath the centrallY disPosed spring is Provided with carbon powder to change the magetic effect in the middle portion. From ampere's law. the conducting membrane maY generate a cross-linked magnetic field may also generate a current resulted from interacting. Not onlY does the feature of the Present invention 219223~
- locates on the electronic, mechanic, the sYstem Portion, s-ignal laYer conducting membrane and keyswitch, but will also include the circuit which construct the cross-linked uPPer and-l-ower laYers and the current generated from the conducting membrane.
Those techniques have not been disclosed by the conventional art.
US Pat. 4'494'109 and 4'529'967 disclose the selection of the keYboard by inductio~ and caPacitance resPectively.
Nevertheless, it has a poor f-unction, many a missing or mistYPing have been encountered. On the other hand, the manufacturing cost is comParativelY high. By the provision of the Present invention, the problems encountered bY those two U.S. Patents have been solved since the On-Off can be readily adjusted to meet differènt requirements from different users.
In US-Pat. 4'494'109, it uses the non-contact tYpe and utilize the transformer and secon-darY induction tYPe arra~
signal which Passes a multiplexer and a binarY/decimal converter and binarY counter and storing latching circuit. This is completely different with the Present invention, US Pat.
4'529'967 utilizes the sensitive shaPe and mutual induction PrinciPle via base gate oPen circuit and decoder, analog multiplexer and voltage comParator, inventor and microProcessor to handle the assembled N-keY cycle. The keyswitch utilizes the electromagnetic operation and incorporating the scan control.
This is also different with the Present invention.
US Pat. 3'B98'531 is a solid state of a keyboard which uses alternative vibration and spring. In different magnetic '" 219223~

- sectors, it generates different cross-linked current wave and detected by Potential level later. Then a Pulse is generated and gate control S~. The signal is sent to outPut gate. The configuration and working principle are different with the present invention.
US Pat. 3'740'746 uses inductive magnetic/drum, two half/-circle edge and insulating Plate-to construct the matrix coding transformation. It has at least for three layers of uPper insulating laYer, the upper and lower magnetic sectors. The structure, shaPe and couPling are from the present invention.
US Pat. 4'283'71~ discloses cross matrix sensitive keyboard which ls different with the Present invention.
US Pat. 3'641'567 discloses a non-contacting inner-locking system which utilizes the middle cross-linked channels and magnetic ring incorPorated with multi-plexer and comParator.
This is diff-erent with the Present invention.
US Pat. 4'300'127 discloses a solid state non-contacting stYle. It takes two cross-linked magnetic rings with a matching magnetic core. The oPerating current of the keyswitch is generated bY PrimarY nickel coil winding.
' US Pat. 4'344'068 discloses a magnetic ring magnetic sPring collecting system. It takes magnetic block and different magnetic sectors incorporated with matrix to scan the signal.
Then the signal Passes an amplifier, a comParator, a shift register and latching and microporcessor. On the other hand, the voltage and current can be increased by the differential ' 219223G

amPlifier and line current or voltage. This is also different with Present invention.
While Particular embodiment of the Present invention has been illustrated and described for keyboard, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the sPirit and scoPe of the invention. It is therefore intended to cover in the aPPended claims all such changes and modifications that are within the scoPe of the Present invention.

Claims (12)

1. An electromagnetic sensitive switch, comprising a keyboard matrix scanning device;
a signal stabilizing device;
a analog multiplexers device;
a signal amplifier;
a signal triggering device.
a break point controller during the operation;
a signal feedback device;
a signal latching and deleting device;
a CPU which includes pertinent software and controlling program;
a L/O connector;
an indicator display;
by means of the keyswitch disposed on the keyboard matrix scanning circuit, the analog multiplexers, the signal amplifier, the triggering device level limit, the work pause adjusting circuit, a final adjustment for the upper and lower contacting positions of On-Off can be attained, a signal feedback device being provided for increasing the stability of the circuit, by means of the signal latching and deleting device, the signal can be retrieve or delete, the CPU being incorporated with signal auto-collecting, scanning functions, decoding and signal stabilizing control, in order to improve the contacting feeling during the depress of the keyboard, a work pause adjusting circuit being provided for correcting the uncertain On-Off resulted from different depressing force applied by fingers, the character and symbol missing from typing being improved by linear and noiseles, operation the function for prevent mistyping are also improved.
2. An electromagnetic sensitive switch as recited in claim 1, wherein the keyswitch of the keyboard matrix scanning device is made from an upper and lower metal foils coated on a plastic layer, a macro switches are attained by the keyboard matrix through the scanning portion.
3. An electrinagnetic sensitive switch as recited in claim 2, wherein the keyswitch comprises a plastic sheet, a spring, a coil, a carbon powder, a plunger and magnetic detecting portion.
4. An electromagnetic sensitive switch as recited in claim 1, wherein the keyboard matrix scanning device takes cross-link to collect the operating current for key switch, the exchange current is collected by the application of ampere's law and mutual induction.
5. An electromagnetic sensitive switch as recited in claim 1, wherein the configuration of the key switch includes an upper and lower plastic sheet disposed therebetween a spring set, the middle and lower portion are provided with a carbon powder or other magnetic material, the spring is disposed through the upper, middle and lower layers.
6. An electromagnetic sensitive switch as recited in claim 1, wherein the keyboard matrix scanning device is a multi-layer connection which includes two concentric annular paths formed by metal membrane, the lower layer has a concentric annular path made from metal membrane, the upper and lower membrane are cross-linked to form vertical connection, an electrical conducting can be established when the keytop is depressed, it has a sense of orientation.
7. An electromagnetic sensitive switch as recited in claim 1, wherein the CPU is incorporated with controlling program and signal processing device for auto signal latching, signal deleting, decoding, signal feedback device and stabling modifications.
8. An electromagnetic sensitive switch as recited in claim 7, wherin the potential control functions includes a multiplexer, operating amplifier, rheostat and schmitter triggering device.
9. An electromagnetic sensitive switch as recited in claim 1, wherein the keyboard matrix scanning device is provided with current adjustment and potential control functions.
10. An electromagnetic sensitive switch as recited in claim 1, wherein the CPU is connected with an I/O connector, resonator, indicator display, decoder, the signal latching and deleting device and working current and work pause controlling of CPU.
11. An electromagnetic sensitive switch as recited in claim 1, wherein the analog multiplexer provides the amplification of signal to increase the signal processing potential.
12. An electromagnetic sensitive switch as recited in claim 1. wherein the work pause control the keyswitch of the keyboard, the adjustment can be readily performed by the rheostat to suit the depressing force applied by different user.
CA002192230A 1996-12-05 1996-12-05 Electromagnetic sensitive switch Abandoned CA2192230A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002192230A CA2192230A1 (en) 1996-12-05 1996-12-05 Electromagnetic sensitive switch
DE19652825A DE19652825B4 (en) 1996-12-05 1996-12-18 button switch
FR9615941A FR2757714B1 (en) 1996-12-05 1996-12-24 LOW STROKE ELECTROMAGNETIC SWITCH

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002192230A CA2192230A1 (en) 1996-12-05 1996-12-05 Electromagnetic sensitive switch
DE19652825A DE19652825B4 (en) 1996-12-05 1996-12-18 button switch
FR9615941A FR2757714B1 (en) 1996-12-05 1996-12-24 LOW STROKE ELECTROMAGNETIC SWITCH

Publications (1)

Publication Number Publication Date
CA2192230A1 true CA2192230A1 (en) 1998-06-05

Family

ID=27170235

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002192230A Abandoned CA2192230A1 (en) 1996-12-05 1996-12-05 Electromagnetic sensitive switch

Country Status (3)

Country Link
CA (1) CA2192230A1 (en)
DE (1) DE19652825B4 (en)
FR (1) FR2757714B1 (en)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641567A (en) * 1970-03-09 1972-02-08 Potter Instrument Co Inc Noncontacting keyboard and interlockng system
US3698531A (en) * 1970-10-26 1972-10-17 Illinois Tool Works Solid state switch
FR2115703A5 (en) * 1970-11-30 1972-07-07 Cit Alcatel
US4300127A (en) * 1978-09-27 1981-11-10 Bernin Victor M Solid state noncontacting keyboard employing a differential transformer element
US4494109A (en) * 1978-09-27 1985-01-15 Bernin Victor M Noncontacting keyboard employing a transformer element
US4344068A (en) * 1979-05-29 1982-08-10 International Business Machines Corporation Coding schemes for acoustic delay line data collection system
US4283714A (en) * 1979-08-08 1981-08-11 Texas Instruments Incorporated Magnetic keyboard system
US4529967A (en) * 1982-07-15 1985-07-16 Gifft Thomas H Non contacting inductive keyboard
DE3324234C2 (en) * 1983-07-02 1985-09-26 H. Berthold Ag, 1000 Berlin Touch panel for a screen
JPH0628020B2 (en) * 1988-01-22 1994-04-13 株式会社東芝 Key input device
DE3836733A1 (en) * 1988-10-28 1990-05-03 Mannesmann Kienzle Gmbh CIRCUIT ARRANGEMENT FOR SETTING THE TRIGGER POINT IN AN INDUCTIVE KEYBOARD
US5062198A (en) * 1990-05-08 1991-11-05 Keytec, Inc. Method of making a transparent touch screen switch assembly
US5431064A (en) * 1992-09-18 1995-07-11 Home Row, Inc. Transducer array
DE9316733U1 (en) * 1993-10-26 1994-05-26 Marketing Partners Ges Fuer Ma Flexible membrane keyboard with a modular structure

Also Published As

Publication number Publication date
FR2757714B1 (en) 1999-07-23
FR2757714A1 (en) 1998-06-26
DE19652825B4 (en) 2007-06-06
DE19652825A1 (en) 1998-06-25

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Legal Events

Date Code Title Description
FZDE Discontinued