JPH11233312A - Electrical component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical components which is capable of preventing continuity between terminal sections due to bleeding of paste, resulting in few detective products, and can be manufactured at good productivity. SOLUTION: An electrical component is constituted by forming a film section having irregularities 4e on its end face section on an insulating substrate 1 and positioning a terminal sections 6a of a conductive section 6, formed in the film section 4 to the recesses 4c of the irregularities 4e at intervals from the front ends of projecting sections 4d. Therefore, bleeding of paste which occurs when the terminal sections 6a are formed by printing, etc., can be prevented from reaching the adjacent terminal section 6a by the projecting sections 4d and few defective electrical components results, and satisfactory electric components can be manufactured at high productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric component suitable for use in a variable resistor, a switch, and the like having a conductive portion formed by printing or the like.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, a conventional electric component, for example, a double variable resistor with a tap, is an insulating substrate 21 made of a phenol resin having a hole 21a at the center.
First, first and second tap electrodes 22 and 23 are formed by printing a silver paste. Next, on the insulating substrate 21,
Both ends 22a, 22b, and 2 of the tap electrodes 22, 23
The coating 24 is formed by printing the paste of the insulating material with the portions 3a and 23b exposed. At this time, the tap electrode 22,
One end portions 22b and 23b of 23 are exposed by holes 24a and 24b provided in the film portion 24. Then, a first conductive portion 25 formed by printing a silver paste and first and second resistors 26 and 27 formed by printing a resistive paste are sequentially formed on the coating portion 24 from the outer peripheral side.
And a second conductive portion 28 formed by printing silver paste. At this time, the middle part of the first resistor 26 is connected to the end 22b of the tap electrode 22, and the middle part of the second resistor 27 is connected to the end 23b of the tap electrode 23, and other parts are connected. Resistors 26 and 27, and conductive portion 25,
Reference numeral 28 is insulated from the tap electrodes 22 and 23 by the coating 24.

On the insulating substrate 21, a tap electrode 2
Terminal portions 22c, 23c formed by printing silver paste are formed, which are respectively connected to the end portions 22a, 23a of 2, 23. Also, the ends of the first and second conductive portions 25 and 28 and the ends of the first and second resistors 26 and 27
The terminal portions 25a, 28a, 26a, 26b, and 2 formed by printing silver paste are connected to each other.
7a and 27b are formed. Then, these terminal portions are connected to the linear end face portion 2 of the film portion 24 from above the film portion 24.
4c and extends over the insulating substrate 21. Thus, the tap electrodes 22 and 23, the first and second conductive portions 2
Metal terminals (not shown) are attached to the terminal portions of the first and second resistors 5 and 28 and the first and second resistors 26 and 27, respectively, and are connected to a printed circuit board (not shown). For ease or miniaturization of the insulating substrate 21, the terminal portions are arranged concentratedly on one end surface side of the insulating substrate 21.

[0004] Such a dual variable resistor with tap is provided with a first variable resistor by sliding a slider (not shown) between the first conductive portion 25 and the first resistor 26. A second variable resistor is formed by sliding a slider (not shown) between the second conductive portion 28 and the second resistor 27.

FIG. 9 shows a dual variable resistor as another conventional electric component. The dual variable resistor is composed of a ceramic insulating substrate 3 having a hole 31a in the center.
1 on the upper surface of the insulating substrate 31 to facilitate printing,
Further, in order to improve the precision, the coating 32 is formed by printing a paste of an insulating material. And, this coating part 32
A first conductive portion 33 formed by printing a silver paste and a first conductive portion formed by printing a resistive paste are sequentially formed on the upper side.
And second resistors 34 and 35, and a second conductive portion 36 formed by printing silver paste. The ends of the first and second conductive portions 33 and 36 and the ends of the first and second resistors 34 and 35 are formed by printing silver paste in a state where they are connected to each other. Terminal portions 33a, 36
a, and 34a, 34b, 35a, 35b are formed. Then, these terminal portions extend from above the film portion 32 over the linear end surface portion 32a of the film portion 32 to the insulating substrate 31.
It is extended above. As described above, the respective terminals of the first and second conductive portions 33 and 36 and the first and second resistors 34 and 35 are connected to one end of the insulating substrate 31 for the same reason as in the above-described conventional example. It is arranged in a concentrated manner on the surface side.

[0006] In such a dual variable resistor, a first variable resistor is brought into sliding contact with a first conductive portion 33 and a first resistor 34 by a slider (not shown). Further, a second variable resistor is formed by sliding a slider (not shown) between the second conductive portion 36 and the second resistor 35.

[0007]

In a conventional electric component, conductive portions 25 and 28 and resistors 26 and 27 are formed on a film portion 24 provided on an insulating substrate 21, and these terminal portions are formed. , Extending from the coating portion 24 to the insulating substrate 21 beyond the linear end face portion 24c of the coating portion 24,
When the terminal portion is formed by printing or the like, the paste at the step portion of the end face portion 24c is connected to the step portion corner portion by a capillary phenomenon, and bleeds out from a predetermined shape,
There is a problem that conduction is made between adjacent terminals. Also,
Since the terminal portions are concentrated on one end surface side of the insulating substrate 21, the terminal portions are close to each other in the printing process even if conduction does not occur as described above, and the edge surface of the end surface portion 24c between the terminal portions is formed. Since the distance becomes shorter, therefore, during use,
There is a problem that conduction occurs between the terminals due to migration.

[0008]

As a first means for solving the above-mentioned problems, an insulating substrate made of a material such as phenolic resin or ceramic, an insulating substrate formed by printing or the like on the insulating substrate, A film portion made of an insulating material provided with an uneven portion, and a resistor, a good conductor, or the like formed on the insulating substrate by printing or the like over the film portion and beyond the end surface portion and formed on the insulating substrate. A conductive portion, wherein the terminal portion formed at the end of the conductive portion is positioned in the concave portion of the concave-convex portion, and is formed at an interval from the tip of the convex portion of the concave-convex portion. did. Further, as a second solution, the concave portion of the uneven portion is formed in an arc shape. As a third solution, the film portion made of an insulating material is composed of two layers, and the projections of the uneven portion are composed of one layer. As a fourth solution, a configuration is adopted in which the convex portion of the uneven portion of the upper film portion extends beyond the convex portion of the uneven portion of the lower film portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric component of the present invention, for example, a double variable resistor with a tap will be described with reference to FIGS. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a cross-sectional view of a main part of an insulating substrate according to the electric component of the present invention, and FIG.
FIGS. 7A to 7J are explanatory views showing the production of the electric component of the present invention.

As shown in FIGS. 1 to 4, the dual variable resistor with a tap, which is an electric component of the present invention, is formed on an insulating substrate 1 made of a phenol resin having a hole 1a at the center. The first and second tap electrodes 2 and 3 are formed by printing a silver paste having a phenolic binder resin. Next, a paste made of an epoxy resin-based insulating material having excellent insulation properties is printed on the insulating substrate 1 in a state where both ends 2a, 2b and 3a, 3b of the tap electrodes 2, 3 are exposed. Is formed as the first layer 4. At this time, one end portions 2b and 3b of the tap electrodes 2 and 3 are
Are formed by the holes 4a and 4b provided in the inner surface, and the concave portion 4c is formed in an arc shape on one end surface portion of the coating portion 4, and the concave and convex portion 4e in which the convex portion 4d is made short is formed. Have been. Next, a paste made of an epoxy resin-based insulating material having substantially the same shape as the film portion 4 and having a slightly larger outer shape is printed on the first film portion 4 to form an upper layer 2.
A layered film portion 5 is formed. At this time, the holes 5a and 5b provided in the film portion 5 match the holes 4a and 4b of the film portion 4, and the one end portions 2b and 3b of the tap electrodes 2 and 3 are
Are formed by the holes 5a and 5b provided in the film 5, and a concave-convex portion 5e in which the concave portion 5c has an arc shape and the convex portion 5d is elongated is formed on one end surface portion of the film portion 5. The protrusions 5d extend to over the insulating substrate 1 beyond the protrusions 4d of the first layer.

A first conductive portion 6 formed by printing a silver paste containing a phenolic binder resin and a phenolic binder resin are sequentially formed on the second film portion 5 from the outer peripheral side. First and second resistors 7 and 8, which are conductive portions formed by printing a resistive paste, and a second conductive portion 9 formed by printing a silver paste are formed.
At this time, the middle part of the first resistor 7 is connected to the end 2b of the tap electrode 2, and the middle part of the second resistor 8 is connected to the end 3b of the tap electrode 3, and the other parts are connected. Resistor 6,
7 and the conductive portions 5 and 8 are insulated from the tap electrodes 2 and 3 by the coating portion 4 and are reliably insulated by the two coating portions 4 and 5.

On the insulating substrate 1, a tap electrode 2,
The terminal portions 2c and 3c are formed by printing silver paste and connected to the ends 2a and 3a, respectively.
The ends of the first and second conductive portions 6 and 9 and the ends of the first and second resistors 7 and 8 are formed by printing silver paste in a state where they are connected to each other. Terminal portions 6a, 9
a and 7a, 7b, 8a, 8b are formed. These terminal portions are extended from the coating portions 4 and 5 on the insulating substrate 1 beyond the end surfaces of the concave portions 4c and 5c of the concave and convex portions 4e and 5e. 4
c, 5c, and are formed at an interval from the tips of the protrusions 4d, 5d. Thus, the tap electrodes 2, 3,.
Metal terminals (not shown) are attached to the terminal portions of the first and second conductive portions 6, 9 and the first and second resistors 7, 8, respectively. In order to facilitate connection to an unillustrated substrate or the like, or to reduce the size of the insulating substrate 1, the terminal portions are disposed in a concentrated manner on one end surface side of the insulating substrate 1.

Next, a method of manufacturing such a component will be described with reference to FIG. 4. First, a large number of tap electrodes 2 as shown in FIG. 3 is formed by printing with silver paste. Next, a lower film portion 4 as shown in FIG. C was formed by printing with an insulating paste, and an upper film portion 5 as shown in FIG. D was formed by printing with an insulating material paste. Thereafter, each terminal portion 2c, 3c,
6a, 7a, 7b, 8a, 8b, 9a, and first and second
Are formed by printing with silver paste. Next, a second silver paste is printed on each of the terminal portions formed in FIG. E in the shape shown in FIG. The first and second resistors 7 and 8 are formed by printing medium-resistance, high-resistance, and low-resistance resistor pastes in the order shown in FIGS. G,
Steps H and I are performed to obtain a JIS A curve. Finally, the terminal portions, the first and second conductive portions 6, 9 and the first and second resistor members 7, 8 formed in the previous step are formed in the shape shown in FIG. A resist paste having a very low resistance value is printed thereon. Then, finally, the holes 1a and the outer shape of the insulating substrate 1 are punched out by a press to manufacture a large number of resistance substrates.

Such a dual variable resistor with tap is provided with a first variable resistor by sliding a slider (not shown) between the first conductive portion 6 and the first resistor 7. A second variable resistor is formed by bringing a slider (not shown) into sliding contact with the second conductive portion 9 and the second resistor 8. In this embodiment, the epoxy-based coating portions 4 and 5 are used, so that there is no pinhole and sufficient insulation can be obtained. Since it is provided on the inner side, the very hard epoxy-based coating portions 4 and 5 are not cut by a pressing die in a pressing process, so that the life of the die is not reduced and the insulating substrate 1 is cracked. Nothing.
Further, since the terminal portion is provided up to the edge of the insulating substrate 1, the surface of the insulating substrate 1 can be utilized to the maximum, and the outer shape of the insulating substrate 1 can be reduced.

FIGS. 5 and 6 show a double variable resistor according to a second embodiment which is an electric component of the present invention. This double variable resistor is made of ceramic having a hole 11a in the center. In order to make the upper surface of the insulating substrate 11 smooth and to make printing easier and more accurate, an insulating material paste is printed on the insulating substrate 11 to form two layers 12 and 13. The film portion 12 as the lower layer of the first layer is as shown in FIG.
As shown in A of FIG.
a is an arc-shaped portion, and the convex portion 12b is a short-shaped uneven portion 12.
c is formed. As shown in FIG. 6B, the film portion 13 which is the second upper layer has almost the same shape as the film portion 12, and has a concave portion 13a having an arc shape and a convex portion 13b having an elongated shape on one end surface thereof. Formed uneven portion 13c,
The convex portion 13b extends over the insulating substrate 11 over the first layer convex portion 12b.

A first conductive portion 14 formed by printing a silver paste on the film portion 13 sequentially from the outer peripheral side.
And first and second resistors 15 and 16, which are conductive portions formed by printing a resist paste, and a second conductive portion 17 formed by printing a silver paste. In addition, the ends of the first and second conductive portions 14 and 17 and the ends of the first and second resistors 15 and 16 are connected to each other,
Terminal portions 14a, 17a formed by printing silver paste,
And 15a, 15b, 16a and 16b are formed. These terminal portions extend from the coating portions 12 and 13 over the insulating substrate 11 beyond the end surfaces of the concave portions 12a and 13a of the concave and convex portions 12c and 13c.
It is located at 2a, 13a, and is formed at a distance from the tip of the projection 12b, 13b. Thus, the first and second
And the first and second resistors 15, 1
Metal terminals (not shown) are provided on each of the terminal portions 6.
However, in order to facilitate connection to a printed board (not shown) or the like, or to reduce the size of the insulating substrate 1, the terminal portions are concentrated on one end surface side of the insulating substrate 11. It has been done.

In such a double variable resistor, the first variable resistor is brought into sliding contact with the first conductive portion 14 and the first resistor 15 by a slider (not shown). A second variable resistor is formed by sliding a slider (not shown) between the second conductive portion 17 and the second resistor 16.

In the above-described embodiment, the film portion is 2
Although shown in the form of a layer, a single-layer film portion may be used, and the formation of the conductive portion is not limited to screen printing, but may be tampo printing or spraying, that is, when a fluid ink is used. It is valid. The conductive portion may use a resistor in addition to a good conductor such as silver.Furthermore, the terminal portion formed in the conductive portion may use a resistor in addition to the good conductor such as silver. May be. Further, the insulating substrate may be made of a material such as epoxy resin or PPS. In addition to the variable resistor, the terminals are concentrated on one end surface of the insulating substrate for printing wiring or the like. Rotary switch,
The present invention may be applied to electric components such as a rotary encoder.

[0019]

According to the electric component of the present invention, the coating portion 4 having the uneven portion 4e on the end surface is formed on the insulating substrate 1, and the terminal portion 6a of the conductive portion 6 formed on the coating portion 4 is replaced with the uneven portion. Since it is located in the concave portion 4c of the portion 4e and is formed at an interval from the tip of the convex portion 4d, the bleeding of the paste generated when the terminal portion 6a is formed by printing or the like is reduced by the presence of the convex portion 4d. 6a can be prevented, and there can be provided an electric part with less defective products and good productivity.
Further, even when the terminals are close to each other, the edge surface distance between the terminals can be increased by the protrusions 4d, and an electrical component that does not cause conduction between the terminals due to migration can be provided.

Further, by forming the concave portion 4c in an arc shape, when the terminal portion 6a of the conductive portion 6 is formed by printing, the bleeding easily flows effectively along the arc portion, and accumulates on the step portion of the end surface portion. Thus, it is possible to provide a high-precision electric component without any problem. In addition, since the film portion is composed of two layers and the convex portion of the uneven portion is composed of one layer, insulation between the conductive portion provided on the insulating substrate and the conductive portion provided on the film portion is ensured. In addition, when formed by screen printing, the distance between the printing mask and the insulating substrate 1 can be shortened in the step of printing the terminal portion, so that the terminal portion ink is less likely to accumulate in the uneven portions and has excellent reliability. We can provide electrical components. Also,
By extending the convex portion of the uneven portion of the upper film portion over the convex portion of the uneven portion of the lower film portion, it is possible to eliminate the boundary surface between the upper layer and the lower layer in the convex portion, and bleeding Can be prevented from reaching from the boundary surface to between the adjacent terminal portions, and an electric component in which the terminal portions are less likely to accumulate in the uneven portions can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of an insulating substrate according to an electric component of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1;

FIG. 3 is a sectional view of a main part of an insulating substrate according to the electric component of the present invention.

FIG. 4 is an explanatory view showing the production of the electric component of the present invention.

FIG. 5 is a plan view of an insulating substrate according to another embodiment of the electric component of the present invention.

FIG. 6 is a plan view of a coating portion according to another embodiment of the electric component of the present invention.

FIG. 7 is a plan view of an insulating substrate according to a conventional electric component.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is a plan view of an insulating substrate according to another conventional electric component.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 insulating substrate 1a hole 2 first tap electrode 2a, 2b end 2c terminal 3 second tap electrode 3a, 3b end 3c terminal 4 coating 4a, 4b hole 4c concave 4d convex 4e uneven portion 5 Film part 5a, 5b hole 5c concave part 5d convex part 5e uneven part 6 first conductive part 6a terminal part 7 first resistor 7a, 7b terminal part 8 second resistor 8a, 8b terminal part 9 second Conductive portion 9a Terminal portion 11 Insulating substrate 11a Hole 12 Coating portion 12a Concave portion 12b Convex portion 12c Concavo-convex portion 13 Coating portion 13a Concavo 13b Convex portion 13c Concavo-convex portion 14 First conductive portion 14a Terminal portion 15 First resistor 15a , 15b terminal portion 16 second resistor 16a, 16b terminal portion 17 second conductive portion 17a terminal portion

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01H 11/00 H01H 11/00 A H05K 1/11 H05K 1/11 C 3/12 610 3/12 610

Claims (4)

[Claims] 1. An insulating substrate made of a material such as phenolic resin or ceramic; a film portion formed of an insulating material formed on the insulating substrate by printing or the like and having an uneven portion on an end face; And a resistor formed on the insulating substrate by printing or the like over the end face portion and having a terminal portion,
A conductive portion made of a good conductor or the like, and the terminal portion formed at an end portion of the conductive portion is positioned in a concave portion of the uneven portion, and an interval from a tip of a convex portion of the uneven portion is set. An electric component characterized by being placed and formed. 2. The electric component according to claim 1, wherein the concave portion of the concave-convex portion is formed in an arc shape. 3. The electric component according to claim 1, wherein the film portion made of an insulating material is constituted by two layers, and the projections of the uneven portion are constituted by one layer. 4. The method according to claim 3, wherein the convex portion of the uneven portion of the upper film portion extends beyond the convex portion of the uneven portion of the lower film portion. Electrical component.