CN101308717A - Variable resistor - Google Patents
Variable resistor Download PDFInfo
- Publication number
- CN101308717A CN101308717A CNA2008101007110A CN200810100711A CN101308717A CN 101308717 A CN101308717 A CN 101308717A CN A2008101007110 A CNA2008101007110 A CN A2008101007110A CN 200810100711 A CN200810100711 A CN 200810100711A CN 101308717 A CN101308717 A CN 101308717A
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- resistive element
- conductor
- conductors
- variable resistance
- diffusion phenomena
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- Adjustable Resistors (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention provides a variable resistor, having a resistor body (12) formed on an insulation base plate (11), and several conductors (13) configured on extending direction of the resistor body (12). A sliding brush (B) slides on the several conductors (13). In the variable resistor (10), special conductors in the several conductors (13) are only connected with the resistor body (12) at end part of the conductors. For example, end parts of the special conductors are connected with a tapping part formed projecting from the resistor body (12). Thus, influence of spreading phenomenon between the resistor body and the conductors may be reduced so as to improve measurement resolving precision.
Description
Technical field
The present invention relates to variable resistance, particularly relate to a kind of variable resistance that is suitable for liquid level sensor (liquid level sensor) that the liquid level of the fuel tank of automobile etc. is measured etc.
Background technology
In the past, known liquid level sensor is in fuel tank of automobile etc. etc., the float (float) that is installed on an end of arm floats on level of fuel, on the other hand, the slip brush of the other end that is installed on arm slides on substrate with corresponding corresponding to moving up and down of the float of residual fuel amount.(for example with reference to patent documentation 1).On this substrate, as shown in Figure 4, be formed with resistive element 41, this resistive element 41 is applied in fixing voltage.In addition, according to there are a plurality of independent conductors 42 to be derived from resistive element 41, the mode of taking out middle output voltage from each conductor 42 constitutes.And, constitute according to the mode that can detect the output voltage corresponding of on these a plurality of conductors 42, sliding by the brush that slides with the float height.
On the other hand, in recent years,, require the correct residual fuel amount of holding in the fuel tank for distance that realizes suitable oiling opportunity, current residual fuel quantity can be travelled and the purpose of utilizing of giving the driver according to the fuel cost untill further notice of actual travel distance.In order to adapt to such requirement, need to improve the measurement resolving accuracy of liquid level sensor.Measure resolving accuracy by the radical decision of the conductor 42 of deriving from resistive element 41.Therefore, in order to improve the measurement resolving accuracy,, need form the radical of conductor 42 as much as possible with respect to the length of resistive element 41.
Patent documentation: the spy opens the 2006-208024 communique
In order to improve the radical of conductor 42 with respect to resistive element 41 length, the interval between the conductor 42 is straitly formed.But, straitly be formed at this interval when to a certain degree above, near the coupling part of resistive element 41 and conductor 42, may produce metal oxide powder in the adhesives (glass cementation material) that contains by both and silver powder and the diffusion phenomena (with reference to diffusion phenomena position 43 shown in Figure 4) that cause.Owing to sharply reduce difficulty in the position resistance value that such diffusion phenomena take place so the electrical characteristic of resistance that acquisition is wished or regulation just becomes.Therefore, problem is to improve the measurement resolving accuracy in the scope that can ignore such diffusion phenomena.
Summary of the invention
The present invention is just in view of the relevant issues point, and purpose is to provide a kind of can be reduced in the influence of the diffusion phenomena between resistive element and the conductor to improve the variable resistance of measuring resolving accuracy.
Being characterized as of variable resistance of the present invention: a plurality of conductors with alignment arrangements on resistive element that forms on the insulated substrate and bearing of trend at described resistive element; The brush that slides slides on described a plurality of conductors; Specific conductor in described a plurality of conductor only is connected with described resistive element in the end of this conductor.
According to such formation, the specific conductor in a plurality of conductors, owing to only be connected with described resistive element in the end of this conductor, so the position that the diffusion phenomena of following resistive element to contact with conductor can produce is defined in the end of resistive element.Thus, owing to can avoid the undesirable condition of the obvious deterioration that significantly departs from the changes in resistance of wishing scope or electrical characteristic, improve the measurement resolving accuracy so can reduce the influence of the diffusion phenomena between resistive element and the conductor.
In above-mentioned variable resistance, preferably form the tap portion that is connected with the end of described specific conductor at described resistive element.In this case, because the end of particular conductor is connected tap portion, so, can will follow the generating unit locator qualification of the diffusion phenomena that contact of resistive element and conductor in tap portion.Thus, owing to can avoid the undesirable condition of the obvious deterioration that significantly departs from the changes in resistance of wishing scope or electrical characteristic, improve the measurement resolving accuracy so can reduce the influence of the diffusion phenomena between resistive element and the conductor.
In addition, in above-mentioned variable resistance, the whole width range of conductor in the end of the bearing of trend of described resistive element that is disposed at two ends in preferred described a plurality of conductors is connected with this resistive element.Under these circumstances, owing to the whole width range of the conductor that is disposed at two ends in the end of resistive element is connected, so, can apply necessary fixed voltage reliably to resistive element.
For example, in above-mentioned variable resistance, described resistive element and a plurality of conductor are formed at described insulated substrate by printing.Under these circumstances, owing on insulated substrate, form resistive element and a plurality of conductor by printing, so, can make variable resistance simply, make its influence that can reduce the diffusion phenomena between resistive element and the conductor improve the measurement resolving accuracy.
According to the present invention, specific conductor in a plurality of conductors, only be connected with resistive element in the end of this conductor, because the generation position of diffusion phenomena is limited at the end of resistive element, only reduce in this qualification position value of having a resistance, so, significantly depart from the changes in resistance of wishing scope or the obvious deterioration of electrical characteristic owing to can avoid, improve the measurement resolving accuracy so can reduce the influence of the diffusion phenomena between resistive element and the conductor.
Description of drawings
Fig. 1 is the schematic diagram of an execution mode involved in the present invention.
Fig. 2 is the enlarged drawing of the coupling part of the resistive element of the related variable resistance of the above-mentioned execution mode of explanation and a plurality of conductors.
Fig. 3 is the enlarged drawing of the coupling part of tap portion shown in Figure 2 and central portion conductor.
Fig. 4 is the enlarged drawing of the coupling part of the resistive element of explanation variable resistance in the past and a plurality of conductors.
Among the figure: 10-variable resistance, 11-insulated substrate (substrate), 12-resistive element, 121-tap portion (tap), the 13-conductor, 131-terminal part conductor, 132-central portion conductor, 14-conductive path, 15a～15c-electrode, 16a～16c-lead, 21,22-diffusion phenomena position, the overlapping portion of 31-.
Embodiment
Below, with reference to accompanying drawing one embodiment of the present invention is elaborated.
Fig. 1 is the schematic diagram of an example of the variable resistance 10 of an expression execution mode involved in the present invention.The variable resistance 10 that present embodiment is related for example is applicable to the liquid level sensor that the level of fuel in the fuel tank of automobile etc. is measured.In addition, be suitable for the device of the variable resistance 10 of present embodiment, be not limited to this.
As shown in Figure 1, the related variable resistance 10 of present embodiment is provided with insulated substrate with rectangular shape (below be expressed as " substrate ") 11.On substrate 11, be provided with: the lead 16c that has the resistive element 12 of certain-length, is connected with the 3rd electrode 15c at a plurality of conductors 13 of long side direction (bearing of trend) alignment arrangements of resistive element 12, the lead 16a that is connected with the 1st electrode 15a and the 2nd electrode 15b at conductive path the 14, the 1st～the 3rd electrode 15a～15c of the position configuration of separating with a plurality of conductors 13, with each end of resistive element 12 and 16b and a end conductive path 14.
In addition, in resistive element 12, owing to want to stand the dipping of the gasoline in the fuel tank, so use the cermet resistance body that inorganic material that for example gasoline patience is high constitutes (in the glass cementation material, mix metal oxide such as RuOx and constitute resistive element).A plurality of conductors 13, the state so that the end of specific conductor 13 is connected with resistive element 12 is formed on the substrate 11 independently.
In the related variable resistance 10 of present embodiment, these structures (resistive element 12, conductor 13, conductive path 14, electrode 15 and lead 16) are formed on the substrate 11 by printing.Under these circumstances, resistive element 12 is printed under one partially overlaps state on a plurality of conductors 13.In addition, the method that these structures are formed on the substrate 11 is not limited thereto, and can suitably change.
Be suitable for the liquid level sensor of such variable resistance 10, for example be constituted as and comprise: the float, the end that float on the level of fuel of fuel tank etc. are equipped with the angular sensor of the anglec of rotation of float and arm that rotates within the specific limits and detection arm.The variable resistance 10 that present embodiment is related constitutes the part of this angular sensor, measures level of fuel according to the contact position of the slip brush B of a same formation angular sensor part.
The brush B that slides is constituted as with the upper surface of a plurality of conductors 13 and the upper surface of conductive path 14 and contacts, and can slide at the sliding scale shown in Fig. 1 dotted line according to the position of the float corresponding with residual fuel amount.In addition, sliding brush B not with the upper surface of resistive element 12 but contact with the upper surface of conductor 13, is in order to avoid shortcomings such as the higher and loss of brushing of sliding of brush B its contact resistance under the situation of sliding on the cermet resistance body that constitutes resistive element 12 that slides is rapid.
Fig. 2 is the enlarged drawing of the connecting portion of the resistive element 12 of the related variable resistance 10 of explanation present embodiment and a plurality of conductor 13.As shown in Figure 2, in the bottom of resistive element 12, be formed with a plurality of tap portion 121.A plurality of tap portion 121 near the position of the central authorities of resistive element 12 to as shown in Figure 2 outstanding formation of lower side.A plurality of conductors 13 are made of a pair of terminal part conductor 131 of two ends of the long side direction that is connected in resistive element 12 and a plurality of central portion conductors 132 of being connected in the tap portion 121 of resistive element 12.
Portion's conductor 131 endways, and two ends of resistive element 12 spread all over whole width regions and overlap.Therefore, near the coupling part of resistive element 12 and terminal part conductor 131, produce diffusion phenomena by metal oxide powder in the adhesives that contains among both and silver powder.Here, as shown in Figure 2,, produce diffusion phenomena position 21 along the inside part of terminal part conductor 131.But this diffusion phenomena position 21 is not owing to exist the diffusion phenomena position that similarly produces near it, so, can not become the reason of the deterioration of the changes in resistance of the scope that obviously departs from hope or electrical characteristic.
In addition, in the related variable resistance 10 of present embodiment, two ends of resistive element 12 spread all over whole width regions and are connected with terminal part conductor 131 down with the state that terminal part conductor 131 overlaps, and are in order to apply necessary voltage to resistive element 12 reliably.
On the other hand, in central portion conductor 132, the top ends of tap portion 121 is to be connected with resistive element 12 with state that the top ends of central portion conductor 132 overlaps.The coupling part of tap portion 121 and central portion conductor 132 is described with Fig. 3 here.Fig. 3 is the enlarged drawing of the coupling part of tap portion 121 shown in Figure 2 and central portion conductor 132.
As shown in Figure 3, tap portion 121 and central portion conductor 132, in the intersection shown in the figure 31, both top ends overlap.Therefore, near this coincidence part 31, produce diffusion phenomena by metal oxide powder in the adhesives that contains among both and silver powder.As shown in Figure 3,, produce diffusion phenomena position 22 here, along the inside part of coincidence part 31.But this diffusion phenomena position 22 is owing to be limited in the scope of tap portion 121, even so produce diffusion phenomena, owing to only reduce in the position of this qualification resistance value, so, the reason of the deterioration of the changes in resistance of the scope that obviously departs from hope or electrical characteristic can not become.
In the related variable resistance 10 of such present embodiment, because only the end of the central conductor 132 in a plurality of conductors 13 is connected with resistive element 12, so, the generation position of following the diffusion phenomena that are connected of resistive element 12 and conductor 13 can be limited to the end of resistive element 12.Significantly depart from the changes in resistance of wishing scope or the obvious deterioration of electrical characteristic owing to can avoid, improve the measurement resolving accuracy so can reduce the influence of the diffusion phenomena between resistive element 12 and the conductor 13.
Particularly, in the related variable resistance 10 of present embodiment, owing under the state of the top ends of tap portion 121 and the top ends coincidence of central conductor portion 132, be connected resistive element 12 and conductor 13, so, owing to diffusion phenomena position 22 can be defined in the scope of tap portion 121, so, can reduce the influence of the diffusion phenomena between resistive element 12 and the conductor 13 and improve the measurement resolving accuracy.
In addition, in the related variable resistance 10 of present embodiment, spread all under the state that whole width and terminal part conductor 131 overlap in two ends and to be connected resistive element 12 and conductor 13, so can apply the voltage of necessity reliably to resistive element 12 resistive element 12.
In addition, the present invention is not limited to above-mentioned execution mode, can carry out various changes and implement.In the above-described embodiment, be not limited to the illustrated size of accompanying drawing, shape, can suitably change in the scope of performance effect of the present invention.In addition, only otherwise break away from the scope of purpose of the present invention, can suitably change and implement.
For example, in the above-described embodiment,, the top ends of the tap portion 121 that is located at resistive element 12 is illustrated with the situation that the top ends of the central portion conductor 132 of conductor 13 is connected as an example that only connects resistive element 12 in the end of central portion conductor 132.But, being not limited to the formation that only is connected with resistive element 12 in the end of central portion conductor 132, can suitably change.For example, also can be connected in 12 ends of the resistive element that does not have tap portion 121 with central portion conductor 132.Even in this case, the position that also diffusion phenomena that are connected of following resistive element 12 and conductor 13 can be produced is defined in the end of resistive element 12.Thus, significantly depart from the changes in resistance of wishing scope or the obvious deterioration of electrical characteristic, improve the measurement resolving accuracy so can reduce the influence of the diffusion phenomena between resistive element 12 and the conductor 13 owing to can avoid.
Claims (4)
1. variable resistance, a plurality of conductors with alignment arrangements on resistive element that forms on the insulated substrate and bearing of trend at described resistive element, the brush that slides slides on described a plurality of conductors,
Specific conductor in described a plurality of conductor only is connected with described resistive element in the end of this conductor.
2. variable resistance according to claim 1 is characterized in that,
At described resistive element, be formed with the tap portion that is connected with the end of described specific conductor.
3. variable resistance according to claim 1 and 2 is characterized in that,
Be disposed at the conductor at both ends in described a plurality of conductor, the whole width regions in the end of the bearing of trend of described resistive element is connected with this resistive element.
4. according to any described variable resistance in the claim 1 to 3, it is characterized in that,
Described resistive element and a plurality of conductor are formed at described insulated substrate by printing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-131233 | 2007-05-17 | ||
| JP2007131233A JP2008288354A (en) | 2007-05-17 | 2007-05-17 | Variable resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101308717A true CN101308717A (en) | 2008-11-19 |
Family
ID=40125099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101007110A Pending CN101308717A (en) | 2007-05-17 | 2008-05-16 | Variable resistor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2008288354A (en) |
| CN (1) | CN101308717A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6119644B2 (en) | 2014-03-07 | 2017-04-26 | 株式会社デンソー | Variable resistor plate for liquid level detection device, method for manufacturing variable resistor plate, liquid level detection device |
-
2007
- 2007-05-17 JP JP2007131233A patent/JP2008288354A/en not_active Withdrawn
-
2008
- 2008-05-16 CN CNA2008101007110A patent/CN101308717A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008288354A (en) | 2008-11-27 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20081119 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |