CN1046585C - Manufacture of keyboard film - Google Patents

Abstract

The present invention relates to a keyboard film making method which comprises: jumper wires needed by all loops are shared, and the length of each jumper wire is limited, so that the number of the keyboard films for an axis and a Y axis circuits is reduced to one; only four procedures, namely a silver printing net, an upper oxidizing preventing layer, an insulating layer and a carbon powder layer, are adopted; the axis and the Y axis circuits are designed onto one keyboard film, many jumper wires are formed at the time of planning, the wire jumpers are shared by all the loops, the average number is 5 to 6, and the length of each jumper wire is less than 20MM.

Description

Manufacture of keyboard film

The present invention controls the line resistance in a loop about the method for mean allocation wire jumper, need only use one deck keyboard film promptly to can be made into high life, high efficiency device.

It is quick that life step is tending towards, people's utmost point is stressed the efficient of life, work, simplify the frivolous design object that becomes, traditional multiple field keyboard film design has not been inconsistent the demand of modern trend, be eliminated gradually, so the keyboard film circuit design is developed in succession, the application is the method for making about keyboard film.

Other looks into, and traditional keyboard film is all adopted three-chip type, and with reference to shown in Figure 3, the circuit backguy is the bottom with first film 3a respectively, and the 3rd film 5a is the superiors, middle interval one insulating trip 4a.Because carbonaceous wire jumper point will be in contact with one another, so the 3rd film shown in Figure 3 is the superiors, so institute is considered as carrying on the back diagrammatic sketch.Its method for making is: keyboard obtains the signal mode and all takes the required X-axis of conducting, the mode of Y-axis line, as shown in Figure 1, from X-axis 1a, Y-axis 2a circuit is obtained data, relative X-axis 1a, the data of the Y-axis 2a circuit gained table of comparisons as shown in Figure 2, then need depress Y0 if need get " A ", the point that X2 is relative, with IC further do the decoding and get, common X-axis 1a, Y-axis 2a becomes the breakpoint state, so the keyboard diaphragm is got X-axis circuit 1a a slice, and establishing a Y-axis circuit 2a in addition, one deck insulating trip 4a is put at middle interval, opens a circular hole 41a on the insulating trip of the contact point under keypad, depress with keyboard, the interior rubber blanket 6a of button is pressed down impel both to contact logical (as shown in Figure 4);

Aspect the keyboard film making: adopt the keyboard film of being X-axis circuit 1a with first film 3a, get a slice white glues sheet 31a, to cooperate the circuit of keyboard key position design to be printed on the white glues sheet 31a with silver net 32a, because contact adopts carbon dust 33a can increase touch potential, so on each contact, add last layer carbon dust 33a, then put a slice is held suitably big aperture successfully on corresponding each button point position insulating trip 4a, put the 3rd film that Y-axis circuit 2a is set again, Y-axis circuit 2a cooperates by after the Position Design of coiling button, be printed on white glues sheet 51a and go up carbon dust 53a through last silver net 52a equally, so finish three-layer type keyboard key membrane type structure.

The manufacture of prior art, needing three sheet keypad divided thin films to come designs and produces, making step is many and complicated, the cost of manufacture height, must be in conjunction with three formation, many again procedure of processings, the relative cost of finishing the cost of three-chip type keyboard film palpus is up to 28-30 unit, owing to adopted interval one insulating trip 4a among X-axis circuit 1a and the Y-axis circuit 2a, though carbon dust 33a, 53a can increase by the key contacts life-span, but because the white glues sheet 31a of long-term pressurized, 51a has ductility, and the gap between two is shortened gradually, and the bosom causes insulating trip and lost efficacy, two contact points contact back is inseparable, the life-span of keypad thereby termination, so the factor of carbon dust and white glues sheet is added up, it is 1,000 ten thousand times～2,000 ten thousand times that average keyboard is pressed the life-span number of times.

Combine and opinion, the prior art shortcoming is as follows:

1. this three-layer type keyboard film formula structure, needing three sheet keypad divided thin films to offer meter makes, making step is many and complicated, the keyboard film of X-axis, Y-axis circuit, need get a slice white glues sheet respectively, with the circuit that cooperates the design of keyboard key position with silver-colored wire mark on the white glues sheet, contact thereon applies one deck carbon dust again; Need establish an insulating trip in addition, make up these three and just finish, the real genus in processing aspect is complicated.

2. circuit uses silver-colored net, and signal fax effect is very good, and ductility is good, on 20mm length impedance almost nil, still, silver-colored net cost is quite high, this X-axis, Y-axis line design method improve the elongation degree relative cost of circuit greatly.

3. though carbon dust can increase by the key contacts life-span, but because the white glues sheet of long-term pressurized has ductility, gap between two is shortened gradually, insulating trip was lost efficacy and cause two contact points to contact the back branch and do not leave, the life-span of keypad thereby termination, so the factor of carbon dust and white glues sheet is added up, it is 1,000 ten thousand times～2,000 ten thousand times that average keyboard is pressed the life-span number of times.

" manufacture of keyboard film " of the present invention is to divide the required wire jumper in every loop, and restriction wire jumper length, and X-axis, Y-axis circuit are provided, and keyboard film reduces to a slice can reach required purpose.

Because busy now society is constantly progressive, use computer in people's the life everywhere, big station, airport, the bank of arriving, little of general individual, all closely bound up with computer, also to play an important role and be equipped with keyboard, the life-span of keyboard is subjected to the user and pays close attention to, therefore, this creator leads the same trade constantly to design the product of weeding out the old and bring forth the new all the time.The creator is at the problem points of conventional art, through concentrating on studies, the experience that utilization itself is accumulated for many years to the industry is designed and developed into this " manufacture of keyboard film ", being the product that one group of life-span is long, structure is simple and easy and easy to make, also is a kind of economical and practical product.

Purpose of the present invention aims to provide a kind of method for making of less expensive, all line arrangements on a slice keyboard film sheet, the wire jumper on each loop of mean allocation, and restriction wire jumper length, method for making is quick, simple and direct.

Another object of the present invention is to carbon significantly to reduce cost as the springboard material, global design fully increases the keyboard life-span.

As for detailed construction of the present invention, application principle, effect and effect, then the explanation of doing with reference to following adjoint can be understood completely.

The description of drawings that instructions of the present invention cooperated is as follows:

Fig. 1 is general keyboard circuit figure.

Fig. 2 is the arrangement plan that keyboard position cooperates circuit.

Fig. 3 is the design of three layers of keyboard film sheet of tradition.

Fig. 4 is that conventional keyboard is pressed the action synoptic diagram.

Fig. 5 is a required white film graph of the present invention.

Fig. 6 is the silver-colored net synoptic diagram of of the present invention.

Fig. 7 is that anti-oxidation processing layer of the present invention and anti-oxidation processing layer are finished figure.

Fig. 8 is that insulation processing layer of the present invention and insulation processing layer are finished figure.

Fig. 9 is that carbon dust processing layer of the present invention and carbon dust processing layer are finished figure.

Figure 10 is that keyboard of the present invention is pressed the action synoptic diagram.

Figure 11 is keyboard structure figure of the present invention.

Figure 12 is that keyboard of the present invention is pressed synoptic diagram.

See also Fig. 5,6,7,8, shown in 9, can be clear that principle of the present invention, X-axis circuit 1a and Y-axis circuit 2a are designed on a slice keyboard film together, because both unify circuit so show slightly crowded, and each loop can't be made with a line, when planning, can form many wire jumpers, the present invention is when the planning circuit, each loop is designed to share out equally wire jumper, and every loop wire jumper average is 5～6, and the material of wire jumper is a material with the extremely low carbon dust of cost, with carbon dust is that material has the extremely favourable advantage that reduces cost, but unique barely satisfactory part, carbon line resistance is higher, and average 20mm length can produce 100 ohm line resistance.Usually, the line resistance in one loop need be lower than below 1000 ohm, just can not produce the mistake signal, so during designed lines in each loop every wire jumper length be no more than 20mm, average 5～6 of wire jumper number, if with every section 20mm, have 6 wire jumpers, the impedance of total loop is 100  6=600 ohms, add the extremely low impedance of silver-colored line, will not surpass the resistance that limits, so can keep normal signal transmission, not only overcome the shortcoming that X-axis circuit 1a and Y-axis circuit 2a is combined into the keyboard film technology of a slice with the method, cost is significantly reduced.

With the three-chip type keyboard film, it is as follows to shorten the structure that can finish with a slice into a kind of new manufacturing technology in the present invention:

Please refer to shown in Figure 5ly, get required white glues sheet 1, with above-mentioned planning finish must circuit be printed on (as shown in Figure 6) on the white glues sheet 1 in the mode of silver-colored net 2, comprise key button contact 21 and jumper connection point 22.Because the ductility of silver is good and value is very low, be the ten minutes excellent material, moreover, at the silver-colored net anti-oxidation processing layers 3 of 2 place's last layers (as shown in Figure 7) of last silver-colored line part, but this layer prevents oxidation processes layer 3 on key button contact 21 and wire jumper contact 22 are neither, and this layer has insulation function concurrently.But insulation is not absolutely to guarantee, therefore, must add one deck insulation processing 4 (as shown in Figure 8) again at last carbonaceous wire jumper 51 places, after finishing three programs, promptly key button contact 21, on carbonaceous jump bar 51, wire jumper contact 22 last layer carbon dust processing layers 5 (as shown in Figure 9), so can form carbonaceous wire jumper 51, carbonaceous key button contact 52; Because the resistance of the line of carbon material is bigger, control for strict quality, in the appropriate position that does not influence circuit, one apart from 20mm length place, respectively establishes two test silver points 23, handles simultaneously with silver-colored net 2, and establish the long carbonaceous wire jumper test point 53 of a segment length 20mm at carbon dust processing layer 5 simultaneously, can monitor this test point value at any time is to be not less than 100 ohm, keeps the stability of product, finishes this program and promptly finishes manufacture of keyboard film of the present invention.

The present invention constitutes with finishing keyboard film by said method, can be by being loaded on the keyboard, (shown in Figure 10,11,12) presses when keyboard and can impel conductive rubber 6 to descend, and conductive rubber skin 6 is provided with a carbon point 61 at the contact point place, reduce to the carbonaceous key button contact 53 of keyboard thin slice and contact, X-axis circuit 1a is communicated with the required firing point electric current of Y-axis circuit 2a, constitute a loop, IC is read; In this mode, the ductility of the white glues sheet 1 long-term pressurized of need not worrying as the contact point material, can significantly promote touch potential with carbon dust, cooperates to be difficult for impaired conductive rubber 6 again, and push button longevity rises to 3,000 ten thousand times～5,000 ten thousand times; Owing to adopt the keyboard film of single piece type, than few two of prior art, need only adopt silver printing net 2, last anti-oxidation processing layer 3, insulation processing layer 4,5 four kinds of programs of carbon dust processing layer to finish, and X-axis 1a, Y-axis 2a circuit are shorter with establishing an ornamental thread, wire jumper is adopted the carbon material again, lower the consumption of silver, so cost is reduced to 14～16 yuan, program of the present invention is few, the life-span is long and cost is low.

Take a broad view of foregoing invention manufacturing narration and explanation, learn that the present invention possesses following several advantages:

1. the present invention adopts the keyboard film of single piece type, than two less of prior arts, need only adopt silver printing net, last anti-oxidation processing layer, insulation processing layer, four kinds of program of carbon dust layer to finish, and saves multiprogramming than prior art.

2. the present invention adopts X-axis circuit and Y-axis circuit with designing on a slice keyboard film, each loop one line can't be formed, so adopt the wire jumper mode, when the planning circuit, it is 5～6 that each loop wire jumper is limited to average, the material of wire jumper is a material with the extremely low carbon dust of cost, is that material has the advantage that reduces cost with carbon dust.

3. the present invention takes strict quality control, in the appropriate position that does not influence circuit, if one apart from 20mm length, respectively establish two test silver points, handle simultaneously at silver-colored net, handle at carbon dust simultaneously and establish the long carbonaceous wire jumper test point of a segment length 20mm, can monitor this test point value at any time and be lower than 100 ohm, keep the stability of product.

4. keyboard of the present invention is pressed conductive rubber is contacted with the key button contact of keyboard film sheet, the firing point electric current is communicated constitute a loop, this designs with carbon dust as the contact point material, can significantly promote touch potential cooperates and is difficult for impaired conductive rubber, push button longevity rises to 3,000 ten thousand times～5,000 ten thousand times, and the life-span significantly promotes.

5. circuit of the present invention is established the keyboard film of a slice together, so backguy is shorter, and wire jumper employing carbon material, lowering silver-colored consumption, cost can be reduced to 14～16 yuan, the designing for manufacturing that significantly reduces cost.

In sum, said structure of the present invention can reach its result of use really in assembling and when operation, construct simple and easy, innovation, and reality is an obvious tool economic benefit and closes new design in practicality.

The above only is a preferable possible embodiments of the present invention, and is non-so promptly arrest limit claim of the present invention, and the equivalent structure that all utilizations instructions of the present invention and graphic content are done changes, and all is contained within the present invention encloses, hereby Chen Ming.

Claims (6)

1, a kind of manufacture of keyboard film is characterized in that:

A, should be on a slice keyboard film with wire jumper in the X-axis circuit on two keyboard films and Y-axis line design;

B, wire jumper number are divided in each loop, and average is at 5～6;

C, wire jumper constitute with carbon dust, and wire jumper length is less than 20mm.

2, manufacture of keyboard film according to claim 1, it is characterized in that having 5～6 loop resistances with the wire jumper of carbon dust formation should be less than 1000 Ω.

3, a kind of manufacture of keyboard film is characterized in that:

A, get must the white glues sheet, the wiring of finishing in the described wire jumper mode of claim 1, planning institute must a circuit, and is printed on the white glues sheet with silver-colored net mode;

B, have the anti-oxidation processing layer of insulation function concurrently at last silver-colored line part last layer;

C, add the insulation processing layer that one deck prevents that wire jumper and silver-colored net are conducted at last wire jumper place;

D, at the key button contact of not going up the oxidation processes layer and backguy contact and backguy part last layer carbon dust processing layer, and establish a carbonaceous wire jumper test point method.

4, manufacture of keyboard film according to claim 3 is characterized in that circuit comprises the key button contact in described a.

5, manufacture of keyboard film according to claim 3 is characterized in that silver-colored line part does not comprise key button contact and wire jumper contact point in described b.

6, manufacture of keyboard film according to claim 3, it is characterized in that: set carbonaceous wire jumper test point, establish one in the appropriate position that does not influence circuit and respectively establish two test silver points apart from the 20mm place, with establish silver-colored net and handle simultaneously, and establish the long carbonaceous wire jumper test point of a segment length 20mm simultaneously in the carbon dust processing layer, can monitor this test point value at any time and whether be lower than 100 Ω.

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