CN1532853A - Variable resistor - Google Patents
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- CN1532853A CN1532853A CNA2004100085519A CN200410008551A CN1532853A CN 1532853 A CN1532853 A CN 1532853A CN A2004100085519 A CNA2004100085519 A CN A2004100085519A CN 200410008551 A CN200410008551 A CN 200410008551A CN 1532853 A CN1532853 A CN 1532853A
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Abstract
Provided is a variable resistor capable of decreasing a concentrating contact-resistance generated in a boundary between the surface of a resistor and a slider, and superior to a linearity characteristic. An electrode pattern print formed on a thermoplastic susbtrate comprising a heat-pressed conductive coating film enhances a sulfuration resistance and a sliding resistance of the electrode pattern. This decreases the concentrating contact-resistance between the slider and the electrode pattern, and an output voltage of the slider is in proportion to the sliding distance, which improves the linearity characteristic (linearity).
Description
The present invention relates to be used in the rotary variable resistor of position transducer etc., relate in particular to the variable resistance that contact resistance reduces, the linearity characteristic improves that the boundary member at the resistive element surface and the son that slides produces.
Prior art
The rotary variable resistor of substrate-side rotation, at the interior all sides and the outer circumferential side of substrate, the medial electrode portion and the lateral electrode portion that are made of conductive pattern form ring-type or circular-arc, and resistance pattern forms circular-arc between above-mentioned medial electrode portion and lateral electrode portion.Connect above-mentioned medial electrode portion at a side end of above-mentioned resistance pattern, the end of opposite side connects lateral electrode portion.
On the other hand, be provided with 3 sons that slide in the fixed part side, each son that slides can be respectively in the surperficial enterprising line slip of above-mentioned medial electrode portion, resistance pattern and lateral electrode portion.And, if under the state that adds assigned voltage between above-mentioned medial electrode portion and the lateral electrode portion, make the aforesaid substrate rotation by above-mentioned slip, then the resistance value that is directly proportional and changes with its displacement (anglec of rotation) can be taken out as voltage from remaining slides son.
Above-mentioned resistance pattern and form the conductive pattern of above-mentioned electrode part (medial electrode portion and lateral electrode portion) utilizes silk screen print method that conduction coated film such as carbon slurry and silver slurry are coated on the insulated substrates such as bakelite plate (bakelite) or glass epoxy board, it is carried out sintering and the organic solvent removed in the slurry forms.
In the electrode part (conduction coated film) that forms by above-mentioned silver slurry, if entered sulfiding gas such as hydrogen sulfide or sulfur dioxide gas, resistance value increase or broken string can take place then in the gaps such as pin hole that forms or hole in electrode part.
In the past, be generally to cover the whole surface of above-mentioned electrode part with thin carbon layer as the measure that prevents this sulfuration.
Patent documentation 1: Japanese patent laid-open 6-53014 communique
But in above-mentioned variable resistance, above-mentioned carbon-coating itself has a resistance between electrode part surface and slip, produces the contact resistance that above-mentioned slip causes simultaneously, so contact resistance therebetween increases easily.
Especially, if the carbon dust that produces because of the slip grinding enters between electrode part surface and slip, then above-mentioned contact resistance value different position on resistance pattern is easy to generate great variety.Therefore, change the linearity characteristic of variable resistance (characteristic of the output voltage corresponding) reduction with sliding distance (anglec of rotation) on the resistance pattern from voltage of remaining the son output of sliding.
Summary of the invention
The present invention proposes in order to solve above-mentioned existing problem, the variable resistance that its purpose is to provide a kind of contact resistance of the boundary member generation that can be reduced in the resistive element surface and slide sub and improves linear characteristic.
Variable resistance of the present invention, be provided with substrate and have respectively fixed part at slip of above-mentioned resistance pattern and the enterprising line slip of electrode pattern with resistance pattern and electrode pattern, and, aforesaid substrate is formed by the moldable substrate of heat, above-mentioned electrode pattern is formed by the conduction coated film that comprises silver powder that printing on aforesaid substrate forms, and this conduction coated film is carried out hot pressing processing.
In addition, variable resistance of the present invention, be provided with substrate and fixed part, aforesaid substrate has: resistance pattern, draw from this resistance pattern and along above-mentioned figure at interval spaced a plurality of small electrodes and the pair of electrodes figure that is connected with the two ends of above-mentioned resistance pattern respectively in accordance with regulations; Said fixing portion has: above-mentioned a plurality of small electrodes, at slip that alternately slides on the aforesaid substrate surface and slip that slides on above-mentioned electrode pattern, and, aforesaid substrate is formed by the substrate of thermoplasticity, above-mentioned electrode pattern is formed by the conduction coated film that comprises silver powder that printing on aforesaid substrate forms, and this conduction coated film is carried out hot pressing processing.
In the variable resistance of the present invention,,, can improve sulfidation-resistance and anti-sliding so electrode pattern is little close because the conduction coated film is that hot pressing is made.So do not need to come the coated electrode figure with carbon-coating, can reduce contact resistance, therefore can improve linear characteristic.
To above-mentioned situation, wish that above-mentioned conduction coated film is to disperse silver powder and reinforcement material to form in adhesive resin, and wish that the Mohs' hardness of above-mentioned reinforcement material is 3.5～4.5.In addition, the cooperation ratio of desirable above-mentioned conduction coated film is: adhesive resin is that 62～73% volume ratio, silver powder are that 24～34% volume ratio, reinforcement material are 2～5% volume ratio.
Wish that above-mentioned reinforcing material is that average grain diameter is the spherical nickel powder of 3～10 μ m, or have the nickel powder of the kick of needle pattern on its surface.
Perhaps, above-mentioned reinforcement material, can adopt long 10～30 μ m of average fiber and average fiber directly is the whisker (microfibre) of the inorganic compound of 0.3～1.0 μ m, adopts potassium titanate crystal whisker or calcium carbonate crystal whisker as above-mentioned inorganic compound whisker.
In the variable resistance of the present invention, because the average grain diameter or the average fiber of the reinforcement material in the conduction coated film are grown up in the average grain diameter (that big is 3～6 μ m) of silver powder, so reinforcement material and silver powder are exposed on electrode surface together really.So the son that slides is easy and reinforcement material contacts, and can reduce the wearing and tearing with silver powder.And Mohs' hardness is 3.5～4.5 reinforcement material, and good with the compatibility of general material as the son that slides such as phosphor bronze, the friction even reinforcement material and phosphor bronze slide over each other also can reduce both wearing and tearing.
Moreover, wish that above-mentioned silver powder is to constitute by more than at least a in the block silver powder of ball, dendroid silver powder and the flakey silver powder.
Above-mentioned resin-like silver powder because and the block silver powder phase of ball specific energy increase contact between the particle, so, can improve the conductivity of resistance pattern.And, flakey silver powder because and the block silver powder of ball mutually specific energy obtain the area of bigger in-plane, so especially can improve the conductivity of the interior in-plane of resistance pattern.Therefore, wish to use block silver powder of above-mentioned ball and dendroid silver powder, perhaps use block silver powder of above-mentioned ball and flakey silver powder, perhaps mix and use the block silver powder of above-mentioned ball and dendroid silver powder and flakey silver powder.
Moreover, wish that above-mentioned resistance pattern is made of the resistance coated film that forms of printing on aforesaid substrate, and this resistance coated film is carried out hot pressing and formed.
In the case, because the surface smoothness of resistance pattern is good, smooth, so can improve microcosmic linearity characteristic as the precision index of variable resistance.
Moreover aforesaid substrate wishes in polyethylene terephthalate (PET) to add that glass fibre and mineral matter carry out extrusion molding and the insulating properties substrate made.
Using under the situation of this substrate, when hot pressing, can bury electrode pattern underground substrate inside, so, can reduce the overhang of electrode pattern from the substrate surface, can reduce the concavo-convex poor of electrode pattern surface simultaneously.Therefore, the contact resistance when sliding between slip and the electrode pattern surface can reduce, and simultaneously, the wearing and tearing on slide son and electrode pattern surface can reduce.
Description of drawings
Fig. 1 is the exploded perspective view of expression variable resistance of the present invention.
Fig. 2 is the plane graph of expression as the substrate of the 1st execution mode.
Fig. 3 be the expression substrate and the son that slides contact condition, along the profile of the a-a line of Fig. 1.
Fig. 4 is the circuit structure diagram when variable resistance is used as position detecting element.
Fig. 5 is the figure of linear characteristic of the variable resistance of presentation graphs 1.
Fig. 6 is the process chart that explanation utilizes the electrode pattern manufacture method of electrically-conducting paint, and Fig. 6 A is the 1st manufacture method, and Fig. 6 B is the 2nd manufacture method, and Fig. 6 C is the 3rd manufacture method.
Fig. 7 is the process chart that is used to illustrate the electrode pattern manufacture method of utilizing electrically-conducting paint, and Fig. 7 A is the 4th manufacture method, and Fig. 7 B is the 5th manufacture method.
Fig. 8 is the plane graph of expression as the substrate of the 2nd execution mode.
Fig. 9 is the figure of linear characteristic of the variable resistance of presentation graphs 8.
Embodiment
Fig. 1 is the exploded perspective view of expression variable resistance of the present invention, Fig. 2 is the plane graph of expression as the substrate of the 1st execution mode, Fig. 3 is the contact condition of the expression substrate and the son that slides, it is profile along the a-a line of Fig. 1, Fig. 4 is the circuit structure diagram when variable resistance is used as position detecting element, and Fig. 5 is the figure of linear characteristic of the variable resistance of presentation graphs 1.
This rotary body 2 has: circular base portion 2A and the knob 2B that gives prominence to diagram Z2 direction from above-mentioned base portion 2A by rotating this knob 2B, can make rotating part 2 along diagram α 1 directions and the rotation of α 2 directions.
As shown in Figure 2, the centre perforation at aforesaid substrate 3 is provided with hole 3A.In interior all sides of sliding surface (face of the Z1 side among Fig. 1) 3B of substrate 3, around above-mentioned hole 3A, formed roughly the 1st electrode pattern 3a of circular shape.And, formed roughly the 2nd electrode pattern 3c of circular shape at the outer circumferential side of sliding surface 3B.And, between above-mentioned the 1st electrode pattern 3a and the 2nd electrode pattern 3c, formed the resistance pattern 3b of general toroidal.The side end of above-mentioned resistance pattern 3b is connected on above-mentioned the 1st electrode pattern 3a, and the end side of above-mentioned resistance pattern 3b is connected on the 2nd electrode pattern 3c.That is to say, on the two ends of resistance pattern 3b, connect the 1st electrode pattern 3a and the 2nd electrode pattern 3c respectively.At this, the 1st and the 2nd electrode pattern 3a, 3c make carrying out hot pressing with silver powder as the conduction coated film of conductive filler, and this manufacture method is narrated later on.And on substrate shown in Figure 23, the side end of above-mentioned resistance pattern 3B and the center angle between the end side are set at 270 degree.
Above-mentioned supporting base 4 usefulness synthetic resin shown in Figure 1 wait and form.On the face of the diagram Z2 of above-mentioned supporting base 4 side, be provided with recess 4A, in this recess 4A, be formed centrally centre bore 4B.And formed dimetric hole 4C in the inside of above-mentioned recess 4A.Be provided with 3 slide sub-6a, 6b, 6c in the inside of this recess 4C.
The sub-6a of above-mentioned slip, 6b, 6c are embedded in the inside of above-mentioned supporting base 4, and the sub-6a of only above-mentioned slip, 6b, 6c appear among hole 4C and the recess 4A.
This slide sub-6a, 6b, 6c are nickel plating on phosphor bronze, and its surface is gone up silver-plated, then the front end bending machining is become circular.The sub-6a of above-mentioned slip, 6b, 6c have the elasticity of illustrated Z1-Z2 direction, the surface of can elasticity pushing the 1st electrode pattern 3a, resistance pattern 3b and the 2nd electrode pattern 3c.
Be provided with terminal 7a, 7b, the 7c that extends to diagram Y2 direction in the end of supporting base 4, above-mentioned terminal 7a, 7b, 7c are connected respectively on the sub-6a of above-mentioned slip, 6b, the 6c in the inside of supporting base 4.So, to the sub-6a of above-mentioned slip, the last making alive of 6b, 6c, perhaps from the sub-6a of above-mentioned slip, 6b, 6c, take out output by above-mentioned terminal 7a, 7b, 7c.
As shown in Figure 1, the assembly method of variable resistance 1 is: above-mentioned rotating shaft 5 is inserted in the hole 3A of the centre bore 4B of above-mentioned supporting base 4 and substrate 3, and then is inserted in the not shown hole that is provided with on the illustrated Z1 side surface of rotary body 2.Aforesaid substrate 3, the surface of diagram Z2 side is fixed on the rotary body 2 and rotary body 2 is supported on illustrated α 1 and α 2 directions freely rotatable with becoming one.
As shown in Figure 3, the sub-6a of above-mentioned slip, 6b, 6c respectively with the sliding surface 3B that is arranged on substrate 3 on above-mentioned the 1st electrode pattern 3a, resistance pattern 3b contact with the surface of the 2nd electrode pattern 3c.So when making rotary body 2 rotations, the sub-6a of above-mentioned slip, 6b, 6c can slide on the surface of above-mentioned the 1st electrode pattern 3a, resistance pattern 3b and the 2nd electrode pattern 3c respectively.
Therefore, for example, if the terminal 7a of a side is connected on the power Vcc (for example 5v), the terminal 7c of another side is grounding on the ground wire GND, then can between above-mentioned the 1st electrode pattern 3a and the 2nd electrode pattern 3c, add assigned voltage, can obtain the output voltage V o of the sub-6b of above-mentioned slip that on above-mentioned resistance pattern 3b, slides by above-mentioned terminal 7b by the slide sub-6a and the sub-6c that slides.Like this, can obtain the corresponding voltage in position with the sub-6b of above-mentioned slip that on resistance pattern 3b, slides, promptly with the corresponding voltage of the anglec of rotation of rotary body 2.
And, when sliding, at above-mentioned resistance pattern 3b with slide and produce contact resistance between the sub-6b, but because the input impedance of the not shown testing circuit that is connected with terminal 7b shown in Figure 4 is generally up to several M Ω, so the influence of above-mentioned contact resistance can be ignored when detecting output voltage V o.
On the other hand, at the 1st electrode pattern 3a with slide between the sub-6a and the 2nd electrode pattern 3c and the contact resistance between the sub-6c of sliding, can utilize the electrode pattern that forms by following manufacture method to deal with processing.
Fig. 6 and Fig. 7 are the process charts that is used to illustrate the electrode pattern manufacture method that adopts the conduction coated film, and Fig. 6 A is the 1st manufacture method, and Fig. 6 B is the 2nd manufacture method, and Fig. 6 C is the 3rd manufacture method, and Fig. 7 A is the 4th manufacture method, and Fig. 7 B is the 5th manufacture method.
The the 1st to the 5th manufacture method is and makes electrically-conducting paint (silver slurry) and resistance coating (carbon slurry) in advance.The manufacture method of above-mentioned electrically-conducting paint is, in the resin solution in adhesive resin being dissolved into organic solvent such as carbitol for example, disperses block silver powder of ball and dendroid silver powder or/and silver powder that flakey silver powder mixes and reinforcement material.
The mix proportion of above-mentioned electrically-conducting paint is, adhesive resin is that 62～73% volume ratio, silver powder are that 24～34% volume ratio, reinforcement material are 2～5% volume ratio, and above-mentioned adhesive resin is a resol resin.And above-mentioned mix proportion is the ratio that does not contain organic solvent, and the mix proportion of removing in the conductive coat dry behind the organic solvent is also consistent therewith.
And reinforcement material should adopt the nickel powder of Mohs' hardness 3.5～4.5, is more preferably the nickel powder that is roughly the flat sugared shape of gold, promptly has the nickel powder of needle pattern kick on the surface.Perhaps, above-mentioned nickel powder also can be that spherical particle about average grain diameter 3～10 μ m (needs not to be complete spheroidal.Down with), or 15% silver covers flake shaped particle on the nickel powder or 15% silver and covers spherical particle on the nickel powder etc.Mix proportion as the nickel powder of reinforcement material is advisable with 2～5% volume ratio, preferably 2.0～3.3% volume ratio.
And the mix proportion of electrically-conducting paint (mix proportion that does not contain organic material) also can be: adhesive resin is 62～70% volume ratio, and silver powder is 24～34% volume ratio, and reinforcement material whisker (microfibre) is 1.9～4.8% volume ratio.
Whisker in the case be advisable with long 10～30 μ m of average fiber, average fiber footpath 0.3～1.0 μ m, and whisker hardness is advisable with Mohs' hardness 3.5～4.5, for example potassium titanate crystal whisker, calcium carbonate crystal whisker etc.If Mohs' hardness is below 3.5, then the wear extent of electrode pattern 3a, 3c increases; If Mohs' hardness is greater than 4.5, the wear extent of then slide sub-6a, 6c increases, and simultaneously, the contact life-span of variable resistance is difficult to prolong.
And above-mentioned potassium titanate crystal whisker for example can use dike that this Da of Ri mound chemical company sells this not (テ イ ス モ, trade name) etc.And calcium carbonate crystal whisker can use Wei Sikaer (ウ イ ス カ Le, trade name) of Japanese ball tail Calcium company etc.
The average grain of the block silver powder of above-mentioned ball directly is 3～6 μ m, and is littler than the reinforcement material of average grain diameter 7～10 μ m or long 10～30 μ m of average fiber.Like this, the block silver powder of ball exists easily in the inside of electrode pattern 3a, 3c, can avoid contacting with the direct of sub-6a, 6c that slide, so can reduce wearing and tearing.Therefore, by sneaking into the block silver powder of ball, can keep the electrode pattern 3a that constitutes by the conduction coated film that forms with electrically-conducting paint, the conductivity of 3c.
Because intergranular contact point is many in the above-mentioned dendroid silver powder, so, by sneaking into dendroid silver powder, can improve the conductivity of electrode pattern 3a, 3b.And flakey silver powder is that spherical silver powder is crushed the formation flat, can increase the area of in-plane, so, by sneaking into flakey silver powder, can improve the conductivity of the in-plane of electrode pattern 3a, 3b.Hope except the block silver powder of ball, is also sneaked into dendroid silver powder or/and flakey silver powder in silver powder.
And resistance coating for example adopts following carbon pastes etc.: except carbon black, sneak into and dispersed carbon pearl (spherical vitreous carbon), carbon fiber, graphite in order to adjust hardness in resol resin.
＜the 1 manufacture method 〉
The 1st manufacture method is at first carried out printing process (S1) as shown in Figure 6A, uses above-mentioned electrically-conducting paint and by silk screen print method, forms above-mentioned the 1st electrode pattern 3a and the 2nd electrode pattern 3c on the sliding surface 3B of substrate 3.Carry out drying process (S2) then, the electrically-conducting paint on the aforesaid substrate 3 is carried out drying, from above-mentioned coating, remove organic solvent, form the electrode pattern that constitutes by the conduction coated film.Carry out hot pressing process (S3) then, substrate 3 is heated, pressurizes.
Secondly, after cooling base 3, carry out silk screen printing, on the sliding surface 3B of substrate 3, make above-mentioned resistance coating form the shape (S4) of regulation, carry out drying process (S5) then, resistance coating on the aforesaid substrate 3 is carried out drying, from above-mentioned resistance coating, remove and desolvate, form resistance pattern (resistance coated film).And, harden fully in order to make binder resin, at last aforesaid substrate 3 is carried out formal sintering, make substrate 3, have electrode pattern 3a, the 3c and the resistance pattern 3b (S6) that constitute by conduction coated film (silver-colored coated film) on it.
(the 2nd manufacture method 〉
The 2nd manufacture method is at first carried out silk screen printing (S11) shown in Fig. 6 B, use above-mentioned resistance coating and pass through silk screen print method, forms above-mentioned resistance with the shape of stipulating and film on the sliding surface 3B of substrate 3.And, by the resistance coating on the aforesaid substrate 3 is carried out drying, from above-mentioned resistance coating, remove and desolvate, make dried resistance coated film (S12).
Then, carry out the printing process (S13) of printing conductive coating on substrate 3.And, carry out drying process (S14), the electrically-conducting paint on the aforesaid substrate 3 is carried out drying, from above-mentioned electrically-conducting paint, remove organic solvent, form electrode pattern (conduction coated film).Then, carry out hot pressing process, substrate 3 is carried out heating and pressurizing (S15), at last aforesaid substrate 3 is carried out formal sintering, make substrate 3 (S16) with electrode pattern 3a, 3c and resistance pattern 3b.
＜the 3 manufacture method 〉
The 3rd manufacture method is shown in Fig. 6 c, at first, (S1) is identical with the 1st operation, carry out on the sliding surface 3B of substrate 3, forming the printing process (S21) of the electrically-conducting paint of above-mentioned the 1st electrode pattern 3a and the 2nd electrode pattern 3c, carry out drying process (S22) then, the electrically-conducting paint on the aforesaid substrate 3 is carried out drying.
Then carry out silk screen printing (S23), promptly by silk screen print method and use above-mentioned resistance coating, on the sliding surface 3B of substrate 3, form above-mentioned resistance coating, then the resistance coating on the aforesaid substrate 3 is carried out drying, from above-mentioned resistance coating, remove desolvate (S24) with the regulation shape.
Then, carry out hot pressing process, to substrate 3 heat, pressurize (S25).At last, by aforesaid substrate 3 being carried out formal sintering, makes having the substrate 3 (S26) of electrode pattern 3a, 3c and resistance pattern 3b.
＜the 4 manufacture method 〉
The 4th manufacture method is shown in Fig. 7 A, and is at first the same with the 2nd manufacture method, carries out the printing process (S31) of the above-mentioned resistance coating of printing on the sliding surface 3B of substrate 3, carries out the resistance coating on the aforesaid substrate 3 is carried out dry drying process (S32) again.
Then, carry out substrate 3 is carried out the hot pressing process (S33) of heating and pressurizing.
Then, carry out electrically-conducting paint printing process (S34), on the sliding surface 3B of substrate 3, form above-mentioned the 1st electrode pattern 3a and the 2nd electrode pattern 3c, make the drying process (S35) of the electrically-conducting paint drying on the aforesaid substrate 3 again.
And, carry out hot pressing process (S36) once more to substrate 3 heating and pressurizing, last, by aforesaid substrate 3 being carried out formal sintering, makes having the substrate 3 of electrode pattern 3a, 3c and resistance pattern 3b.
＜the 5 manufacture method 〉
The 5th manufacture method is shown in Fig. 7 B, at first the same with the 1st and the 3rd operation, carry out on the sliding surface 3B of substrate 3, forming the electrically-conducting paint printing process (S41) of above-mentioned the 1st electrode pattern 3a and the 2nd electrode pattern 3c, make the drying process (S42) of the electrically-conducting paint drying on the aforesaid substrate 3 again.
Next carries out substrate 3 is carried out the hot pressing process (S43) of heating and pressurizing.
Then carry out above-mentioned resistance coated film is printed onto printing process (S44) on the sliding surface 3B of substrate 3, make the drying process (S45) of the resistance dried coating film on the aforesaid substrate 3 again.
Then, carry out hot pressing process (S46) that substrate 3 is heated, pressurizes once more.At last aforesaid substrate 3 is carried out formal sintering, make substrate 3 (S47) with electrode pattern 3a, 3c and resistance pattern 3b.
In any manufacture method of the above-mentioned the 1st～the 5th, all can utilize the mould that a pair of minute surface is got up opposite one another to carry out on the above-mentioned hot pressing process.In hot pressing process, substrate 3 is placed on hot pressing with between the minute surface of mould, between the minute surface of mould, on one side substrate 3 is heated, Yi Bian pressurize.The suitable condition of above-mentioned hot pressing process is: pressure 7.84MPa (80kg/cm
2)～49.0MPa (500kg/cm
2), best condition is: 19.6MPa (200kg/cm
2)～39.2MPa (400kg/cm
2).
And the heating-up temperature during hot pressing is advisable more than the glass transition temperature (being about 80 ℃ under the situation of PET) with substrate 3, and the better heating temperature is 175 ℃～185 ℃.In the case, the proper range of hot pressing time is 15 seconds～3 minutes.
When the substrate 3 that is made of above-mentioned thermoplastic resin carries out hot pressing more than the glass transition temperature, substrate 3 can be out of shape, so, even on the electrically-conducting paint that prints on the surface of substrate 3, have concavo-convex, also it can be imbedded substrate 3 inside and, make the error of the thickness direction of electrode pattern reach minimum above-mentioned concavo-convex sponging.
And, owing to carry out hot pressing, so being under pressure with thickness size outstanding slightly electrode pattern integral body from the surface of substrate 3 acts on and be compressed with the mould of mirror-like.So organic solvent was discharged from electrically-conducting paint when silk screen printing was dry, can crush pin hole that forms in the electrode pattern and hole.Therefore, very difficult formation can make sulfiding gas such as hydrogen sulfide and sulfur dioxide gas enter into the interior gap of electrode pattern, so can improve sulfidation-resistance.So, needn't be as before on the surface of electrode pattern outside carbon coating, can eliminate the resistance that carbon-coating forms between slip and electrode pattern.And, the operation of carbon coating outside from the whole manufacturing process of substrate, eliminating.
And, after above-mentioned printing, drying process, block silver powder of ball and reinforcing material nickel powder etc. are given prominence under the lip-deep situation of electrode pattern, also are pressed into electrode pattern inside owing to above-mentioned hot pressing process makes the block silver powder of ball, so, can make the electrode pattern surface smoothing.Therefore, can reduce to slide contact resistance between son and the electrode pattern.
So, the contact resistance r2 that can reduce the 1st electrode pattern 3a shown in Figure 4 significantly and slide the contact resistance r1 that produces between the sub-6a and the 2nd electrode pattern 3c and slide and produce between the sub-6c.
Therefore, the present invention can ignore contact resistance r1, r2, and resistance value changes with the length variations of electrode pattern 3b by a certain percentage, so, as shown in Figure 5, output voltage V o is directly proportional with the sliding distance (anglec of rotation θ) of the sub-6b that slides, can improve linear characteristic (linearity).
And, in above-mentioned the 2nd～the 5th manufacture method, because resistance coating is carried out hot pressing, so can improve the surface smoothness (the average fineness of center line) of resistance pattern 3b.Therefore, can improve the microcosmic linear characteristic of expression variable resistance precision.
Fig. 8 is the plane graph of expression as the substrate of the 2nd execution mode.Fig. 9 is the linear figure of the variable resistance of presentation graphs 8.
At this, respectively draw figure 13d and small electrode 13e, utilization and the 1st and the 2nd electrode pattern 13a, 13c identical materials form in same operation.So, the small electrode 13e that is made of conduction coated film (silver-colored coated film) is also carried out hot pressing, small electrode 13e also has good sulfidation-resistance, so the contact resistance that slides between sub-6b and the small electrode 13e is also very little, can ignore.
In substrate shown in Figure 8 13, when rotary body 2 rotations, the sub-6b that slides slides on above-mentioned small electrode 13e at intervals, so when being connected equally with circuit shown in Figure 4, as shown in Figure 9, the voltage of variable resistance output Vo produces stepwise change.
And, if form the 1st electrode pattern 13a, the 2nd electrode pattern 13c on the aforesaid substrate 13, draw figure 13d, small electrode 13e and resistance pattern 13b with above-mentioned identical manufacture method, then can make adjacent small electrode 13e and the potential difference Δ V between the small electrode 13e certain basically.That is to say, the same with above-mentioned situation, can improve and the relevant linearity of characteristic corresponding to the output voltage V o of the sub-6b sliding distance (anglec of rotation θ) that slides.
And, rotary variable resistor has been described in the above-described embodiment.But the present invention is not limited only to this, also can be following variable resistance, and promptly conductive pattern and resistance pattern are provided with by the parallel lines state on substrate, and the son that slides carries out straight line along above-mentioned figure and moves.
The effect of invention
As mentioned above, You Yu of the present invention utilizes the conduction coated film on the hot pressing legal system Zuo substrate, institute With, want the electrode pattern of composition very little close take silver as Zhu, can improve sulfidation-resistance and anti-sliding. Therefore, needn't apply carbon-coating in Zai electrode pattern surface, can utilize resistivity more much smaller than carbon The silver figure forms electrode pattern, so, produce between Zhi can reduce to slide Zi and the electrode pattern Contact resistance.
Therefore, the variation in the time of reducing contact resistance and be positioned at diverse location, thus the Zhi line can be provided The variable resistance that property is good.
Claims (12)
1, a kind of variable resistance is provided with the substrate with resistance pattern and electrode pattern and has respectively fixed part at slip of above-mentioned resistance pattern and the enterprising line slip of electrode pattern, it is characterized in that,
Aforesaid substrate is formed by the moldable substrate of heat, and above-mentioned electrode pattern is formed by the conduction coated film that comprises silver powder that printing on aforesaid substrate forms, and this conduction coated film is carried out hot pressing processing.
2, a kind of variable resistance, be provided with substrate and fixed part, aforesaid substrate has: resistance pattern, draw from this resistance pattern and along above-mentioned figure at interval spaced a plurality of small electrodes and the pair of electrodes figure that is connected with the two ends of above-mentioned resistance pattern respectively in accordance with regulations, said fixing portion has: above-mentioned a plurality of small electrodes, at slip that alternately slides on the aforesaid substrate surface and slip that slides on above-mentioned electrode pattern, it is characterized in that
Aforesaid substrate is formed by the substrate of thermoplasticity, and above-mentioned electrode pattern is formed by the conduction coated film that comprises silver powder that printing on aforesaid substrate forms, and this conduction coated film is carried out hot pressing processing.
3, variable resistance as claimed in claim 1 or 2 is characterized in that,
Above-mentioned conduction coated film is to disperse silver powder and reinforcement material to form in binder resin.
4, variable resistance as claimed in claim 3 is characterized in that,
The Mohs' hardness of above-mentioned reinforcement material is 3.5～4.5.
5, variable resistance as claimed in claim 3 is characterized in that,
The mix proportion of above-mentioned conduction coated film is: adhesive resin is that 62～73% volume ratio, silver powder are that 24～34% volume ratio, reinforcement material are 2～5% volume ratio.
6, variable resistance as claimed in claim 3 is characterized in that,
Above-mentioned reinforcement material is the spherical nickel powder of average grain diameter 3～10 μ m.
7, variable resistance as claimed in claim 3 is characterized in that,
Above-mentioned reinforcement material is the nickel powder that has the needle pattern kick on its surface.
8, variable resistance as claimed in claim 3 is characterized in that,
Above-mentioned reinforcement material is that average fiber length is that 10～30 μ m and average fiber directly are the whisker (microfibre) of the inorganic compound of 0.3～1.0 μ m.
9, variable resistance as claimed in claim 8 is characterized in that,
Above-mentioned whisker is potassium titanate crystal whisker or calcium carbonate crystal whisker.
10, variable resistance as claimed in claim 1 or 2 is characterized in that,
Above-mentioned silver powder is to constitute by more than at least a in the block silver powder of ball, dendroid silver powder and the flakey silver powder.
11, variable resistance as claimed in claim 1 or 2 is characterized in that,
Above-mentioned resistance pattern is made of the resistance coated film that printing on aforesaid substrate forms, and this resistance coated film is carried out hot pressing processing.
12, variable resistance as claimed in claim 1 or 2 is characterized in that,
Aforesaid substrate is add glass fibre and mineral matter in polyethylene terephthalate (PET) after, carry out extrusion molding and the insulating properties substrate made.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003080024 | 2003-03-24 | ||
| JP2003080024A JP2004288924A (en) | 2003-03-24 | 2003-03-24 | Variable resistor |
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| Publication Number | Publication Date |
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| CN1532853A true CN1532853A (en) | 2004-09-29 |
| CN100338695C CN100338695C (en) | 2007-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100085519A Expired - Fee Related CN100338695C (en) | 2003-03-24 | 2004-03-24 | Variable resistor |
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| JP (1) | JP2004288924A (en) |
| CN (1) | CN100338695C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101583244B (en) * | 2008-05-13 | 2011-11-09 | 欣兴电子股份有限公司 | Method for manufacturing circuit board |
| CN103000252A (en) * | 2012-11-10 | 2013-03-27 | 江苏瑞德新能源科技有限公司 | Solar cell silver-backed slurry ultralow in silver content |
| CN104284928A (en) * | 2012-05-04 | 2015-01-14 | 德莎欧洲公司 | Three-dimensional electrically conductive adhesive film |
| CN105722254A (en) * | 2016-02-24 | 2016-06-29 | 东莞珂洛赫慕电子材料科技有限公司 | Photo-curable resistance paste for flexible electrothermal film and preparation method of photo-curable resistance paste |
| CN107077932A (en) * | 2014-10-31 | 2017-08-18 | 株式会社村田制作所 | Rotating type adjustable resistor and its manufacture method |
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| WO2022215391A1 (en) * | 2021-04-08 | 2022-10-13 | アルプスアルパイン株式会社 | Resistor position sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3380680B2 (en) * | 1996-05-08 | 2003-02-24 | アルプス電気株式会社 | Electrical component |
| JP3770652B2 (en) * | 1996-05-31 | 2006-04-26 | アルプス電気株式会社 | Multiple rotation type variable resistor |
| JP3857070B2 (en) * | 2001-04-25 | 2006-12-13 | アルプス電気株式会社 | Conductive resin composition and contact board using the same |
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2003
- 2003-03-24 JP JP2003080024A patent/JP2004288924A/en not_active Withdrawn
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2004
- 2004-03-24 CN CNB2004100085519A patent/CN100338695C/en not_active Expired - Fee Related
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| CN101583244B (en) * | 2008-05-13 | 2011-11-09 | 欣兴电子股份有限公司 | Method for manufacturing circuit board |
| CN104284928A (en) * | 2012-05-04 | 2015-01-14 | 德莎欧洲公司 | Three-dimensional electrically conductive adhesive film |
| CN104284928B (en) * | 2012-05-04 | 2016-04-13 | 德莎欧洲公司 | Three-dimensional conductive binder film |
| US9598614B2 (en) | 2012-05-04 | 2017-03-21 | Tesa Se | Three-dimensional electrically conductive adhesive film |
| CN103000252A (en) * | 2012-11-10 | 2013-03-27 | 江苏瑞德新能源科技有限公司 | Solar cell silver-backed slurry ultralow in silver content |
| CN103000252B (en) * | 2012-11-10 | 2015-10-28 | 江苏瑞德新能源科技有限公司 | A kind of back silver paste of solar cell with ultralow silver content |
| CN107077932A (en) * | 2014-10-31 | 2017-08-18 | 株式会社村田制作所 | Rotating type adjustable resistor and its manufacture method |
| CN105722254A (en) * | 2016-02-24 | 2016-06-29 | 东莞珂洛赫慕电子材料科技有限公司 | Photo-curable resistance paste for flexible electrothermal film and preparation method of photo-curable resistance paste |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004288924A (en) | 2004-10-14 |
| CN100338695C (en) | 2007-09-19 |
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