JP2000269008A - Electronic components and variable resistor for high voltage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electronic components in which an output terminal and a soldered section are electrically connected to each other in a satisfactory state. SOLUTION: Electric components are constituted, in such a way that the end section of a first connecting conductor 3 passed through a circuit board 1 is connected to a soldered electrode F. A terminal fitting 17, which electrically connects the electrode E to a second connecting conductor 13 inserted into a substrate housing chamber from a connecting conductor leading-in section 15, is integrally formed by machining a metallic sheet. The fitting 17 is provided with a conductor pinching section 21, which pinches the end section of the second connecting conductor 13 and a contacting terminal section 23 having contact sections 23c, and so on which come into contact with a soldered section 5. The contact terminal sections 23c, and so on are constituted of a plurality of projections 23c, and so on which are supported by a platy member 23b so as to surround the upper end section of the soldered section 5 and inclined, so that their front end sections bite into the soldered section 5, when the sections 23c, and so on are pressed against the section 5 by the spring force of the terminal section 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric component and a high-voltage variable resistor.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a main part of an output terminal structure used in a conventional electric component such as a high-voltage variable resistor. In FIG. 3, reference numeral 101 denotes a circuit board provided with a circuit pattern including an electrode 103 made of copper foil or the like on its surface, and the circuit board 101 is housed in a substrate housing chamber of an insulating case (not shown). Reference numeral 105 denotes a first connection conductor having a terminal portion 105a that penetrates the circuit board 101 and the center of the electrode 103 from the back side of the circuit board 101, protrudes to the front side, and is connected to the electrode 103 by soldering. is there. Reference numeral 107 denotes a hemispherical soldered portion formed by curing the molten solder. A conductive elastic body 109 such as a conductive rubber is disposed on the soldering portion 107. In some cases, a second connection conductor such as a lead wire inserted through the insulating case is directly inserted into the conductive elastic body 109. Japanese Patent Application No. 4-87639 (U.S. Pat.
No. 2,669), a solderless terminal fitting provided with a conductor holding portion for holding a second connection conductor inserted through an insulating case (not shown) without soldering is a conductive elastic body. 109.

[0003]

However, in a conventional electronic component, the conductive elastic body 109 must be disposed in an insulating case, which increases the number of electrical components and increases the number of electrical components.
Assembly of electrical parts was troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric component and a high-voltage variable resistor capable of improving the electrical connection between an output terminal and a soldered portion without using a conductive elastic body. Is to provide.

Another object of the present invention is to provide an electric part and a high-voltage variable resistor which are easy to assemble by reducing the number of parts.

[0006]

An electric component to be improved by the present invention has a through hole into which a first connection conductor is inserted from the back side, and the first component inserted through the through hole into the front surface. A circuit board having a circuit pattern including a soldering electrode to which an end of the connection conductor is connected by soldering, a board storage chamber having an open surface, and a wall formed around the board storage chamber and formed into the board storage chamber from outside. An insulating case having a connection conductor introduction portion for introducing an end of the second connection conductor; a circuit board disposed so as to face the inside of the substrate storage chamber of the insulation case; and a wall surrounding the substrate storage chamber And a terminal fitting disposed between them. The terminal fittings are formed integrally by machining a metal plate. The terminal fitting is formed by fitting an end of a second connection conductor inserted into the substrate storage chamber from the connection conductor introduction part into a terminal metal fitting part formed on a wall surrounding the substrate storage chamber of the insulating case. The semiconductor device includes a conductor holding portion to be held, and a contact terminal portion having a contact portion to be in contact with a soldering portion for soldering and connecting the first connection conductor and the soldering electrode. The contact terminal portion is configured to generate a spring force to press the contact portion against the soldering portion in a state where the terminal fitting is disposed between the circuit board and the wall surrounding the board storage chamber. It has a contact support portion for supporting. In the present invention, the contact portion is constituted by a plurality of protrusions supported by the contact support portion and biting into the soldering portion by a spring force. Then, the plurality of protrusions are supported by the contact supporting portion at intervals in the circumferential direction so as to surround the periphery of the soldering portion.

[0007] As in the present invention, if a metal plate is machined to form a terminal fitting integrally and a part of the terminal fitting (contact terminal portion) is brought into direct contact with the soldering portion, as in the prior art. The first connection conductor and the second connection conductor can be electrically connected without using a conductive elastic body. Therefore, the electric connection between the first connection conductor and the second connection conductor can be easily performed simply by disposing the terminal fitting in the insulating case, and the number of electric components can be reduced. In particular, in the present invention,
Since the contact portion of the terminal fitting that comes into contact with the soldering portion to which the first connection conductor is to be soldered is constituted by a plurality of protrusions that bite into the soldering portion by spring force, the connection between the terminal fitting and the soldering portion is ensured. Can be performed.

[0008] The contact support portion is formed of an annular plate-like member located above the soldering portion and arranged so as to surround an imaginary perpendicular line perpendicular to the surface of the circuit board and passing through the top of the soldering portion. Let it. Preferably, the plurality of projections are supported on the inner edge of the annular plate-like member at intervals in the circumferential direction. With this configuration, the plurality of protrusions can be dispersedly arranged around the soldered portion, and the plurality of protrusions can be prevented from coming off the soldered portion.

It is preferable that the plurality of protrusions have a shape such as a triangular shape, the width of which decreases as the distance from the plate-like member increases. With this configuration, even when the spring force is small, the plurality of protrusions can more reliably bite into the soldering portion.

[0010] The plurality of projections can be supported by the contact support portion (plate-like member) in various modes. For example, the plate-like member may be formed in a rectangular annular shape having four sides, and a plurality of protrusions may be separately arranged on the four sides. In this case, the number of the plurality of protrusions can be increased.

Typical electric components to which the present invention can be applied include:
This is a high-voltage variable resistor. This high-voltage variable resistor has a through-hole into which a first connection conductor is inserted from the back side, and an end of the first connection conductor inserted through the through-hole on the front surface is soldered and connected. A circuit board having a circuit pattern including an attachment electrode and one or more variable resistance circuits, a substrate storage chamber having an open surface, and a second connection formed in a wall surrounding the substrate storage chamber from the outside into the substrate storage chamber. An insulating case having a connection conductor introduction portion for introducing an end of the conductor, and a wall surrounding the circuit board and the circuit board disposed so as to face the inside of the circuit board of the insulating case; A terminal fitting is provided, and a slider is provided between the surface of the circuit board housed in the board housing chamber of the insulating case and the inner wall of the insulating case. The terminal fitting is formed integrally by machining the metal plate and integrally formed, and is fitted into a terminal fitting fitting portion formed on a wall surrounding the substrate storage chamber of the insulating case, and is provided with a connection conductor introducing portion. A conductor holding portion for holding an end of a second connection conductor inserted into the substrate storage chamber from the first contact portion, and a contact portion for contacting a hemispherical soldering portion for soldering connection between the first connection conductor and the soldering electrode. And a contact terminal portion having the following. The contact terminal portion is configured to generate a spring force for pressing the contact portion to the soldering portion in a state where the terminal fitting is disposed between the circuit board and the wall surrounding the board storage chamber. It has a contact support part for supporting the part. The contact support portion is formed of a plate-like member located above the soldering portion and arranged so as to surround the upper end of the soldering portion. Further, the contact portion is supported by a plate-like member so as to surround the periphery of the upper end portion of the soldering portion, and when the pressing portion is pressed against the soldering portion by a spring force, a plurality of projections inclined so that the tip portion bites into the soldering portion. Constitute.

[0012]

FIG. 1 is a longitudinal sectional view of a main part of an example of an embodiment in which an electric component of the present invention is applied to a high-voltage variable resistor. FIG. 2A is used in this example. 2 (B) is a right side view of FIG. 2 (A), and FIG. 2 (C).
FIG. 3B is a bottom view of FIG.

As shown in FIG. 1, the high-voltage variable resistor includes a circuit board 1 having a variable resistance circuit pattern including a plurality of electrodes and a variable resistor formed on a surface of a ceramic substrate. FIG. 1 shows only one electrode (soldering electrode) E that is in electrical contact with a terminal fitting 17 to be described later among a plurality of electrodes. The electrode E is a thick-film electrode formed using, for example, a conductive paste obtained by mixing a silver powder with a glass paste. The circuit board 1 has an electrode E
A through-hole 1a into which the first connection conductor 3 is inserted is formed at a predetermined position where is formed.
A hemispherical soldering portion 5 for soldering and connecting the end of the first connection conductor 3 inserted through the through hole 1a to the electrode E is formed. In this example, the end of the first connection conductor 3 is buried in the soldered portion 5. The insulating case 7 has an open shape on one side, and an outer peripheral portion of the circuit board 1 is joined to a step or a rib 7 a formed inside the insulating case 7 using an epoxy-based adhesive 9. ing. As a result, the insulating case 7 houses the circuit board 1 so as to form a space between the surface of the circuit board 1 and the inner wall 7b of the insulating case 7. A lead wire 1 is provided on a peripheral wall portion 7c of the insulating case 7 surrounding the outer peripheral portion of the circuit board 1.
The first core wire, that is, the end of the second connection conductor 13 is connected to the insulating case 7.
A connection conductor introduction portion 15 for guiding inside is formed.

Inside the insulating case 7, a terminal fitting 17 is sandwiched or arranged between the surface of the circuit board 1 and the inner wall 7b of the insulating case 7. Specifically, the terminal fitting 17
Is in a state where the conductor holding portion 21 is fitted to the terminal fitting fitting portion 19. The terminal case fitting portion 19 includes an insulating case 7.
A connection conductor insertion space 19a that communicates with the connection conductor introduction portion 15 formed in the outer wall portion is formed. The connection conductor insertion space 19a is open on the opening side of the insulating case 7, that is, on the circuit board 1 side. In the terminal fitting portion 19, a fitting groove 19b is formed so as to be orthogonal to the connection conductor insertion space 19a. The flat plate portion 21a of the conductor holding portion 21 of the terminal fitting 11 is fitted into the fitting groove 19b.

The terminal fitting 17 includes a conductor holding portion 21 for holding the second connection conductor 13 and a contact terminal portion 23 provided integrally with the conductor holding portion 21. The terminal fittings 17 are formed integrally by subjecting a conductive metal plate such as a stainless steel plate or a phosphor bronze plate to mechanical processing such as pressing or bending. It is preferable that the conductive metal plate be subjected to bending to generate a certain degree of resilience. For example, SUS30 having a thickness in the range of 0.1 mm to 0.4 mm is preferable.
1, stainless steel, bronze having a thickness of 0.2 mm to 0.5 mm, or the like can be used.

The conductor sandwiching portion 21 is composed of a flat plate portion 21a having a substantially rectangular contour and a flat plate portion 21b intersecting with the flat plate portion 21a on the side opposite to the side where the contact terminals 23 are provided. I have. The plate-like portion 21b has a plate surface extending in a direction intersecting the plate surface of the flat plate portion 21a at an angle of about 82 degrees, and in order to stabilize the insertion posture of the terminal fitting 17,
It is arranged in the connection conductor insertion space 19a. Flat plate part 2
Four slits S1 to S4 extending radially from the center toward each corner are formed in 1a. A second connecting conductor 13 to be inserted is inserted between two adjacent slits.
Divided pieces or edge portions 21 that cut into the outer peripheral portion of
c to 21f are formed. Holes S1a to S4a, which are considerably larger than the widths of the slits S1 to S4, are formed in the base portion of the slits S1 to S4. These edge portions 21c to 21f are cut and raised in the insertion direction in which the connection conductor 13 is inserted, and are inclined. This inclination angle is determined so that the dimension between the tip portions of the two opposing edge portions 21c and 21e or 21d and 21f is smaller than the diameter dimension of the connection conductor 13 to be inserted. When the edge portions 21c to 21f are inclined in this manner, the connection conductor 13 can be guided to the center, and the work of inserting the connection conductor 13 becomes easy. Note that, even if the edge portions 21c to 21f are not inclined, the connection conductor 1
If 3 has a certain high hardness, it is possible to insert the connection conductor 13 while inclining these edge portions. Edge portions 21c to 21f of conductor holding portion 21
When the second connection conductor 13 is inserted so as to push open, the connection conductor 13 is gripped by the edge portions 21c to 21f to be in an electrically connected state. When a pulling force is applied to the inserted connection conductor 13, the edge portions 21 c to 21 f are connected to the connection conductor 13.
Easily and deeply into the outer periphery of the connection conductor 13
Will not get out easily. Therefore, the connection conductor 13 is electrically connected to the terminal fitting 17 without solder.

The contact terminal portion 23 has a curved portion 23a formed by machining such as pressing and bending.
An annular plate-like member 23b constituting a contact support portion, and a plurality of projections 23 supported by the plate-like member 23b and constituting a contact portion
c ... The curved portion 23a is configured to be curved so as to protrude in a direction away from the peripheral wall portion 7c on which the connection conductor introduction portion 15 of the insulating case 7 is formed, and goes from the flat plate portion 21a to the plate member 23b. It has a slit 23a1 extending in the direction. This curved part 2
3a, the protrusions 23c are connected to the soldering portions 5 in a state where the terminal fittings 17 are compressed and arranged in the insulating case 7 to some extent.
Generates a spring force that presses against

The plate-like member 23b has an annular shape with a substantially rectangular outline, and has a rectangular opening 23b1 at the center. The plate-like member 23b is located above the soldering portion 5 in a state where the terminal fitting 17 is arranged in the insulating case 7, and surrounds the upper end of the soldering portion 5, that is, is in contact with the surface of the circuit board 1. It is arranged so as to surround an imaginary perpendicular line 25 that is orthogonal and passes through the top of the soldering portion 5. As shown in FIG. 2 (B), the plate member 23b has a flat plate portion 21 in a state where the terminal fitting 17 is not disposed in the insulating case 7.
The intersection angle θ between the imaginary surface 24 orthogonal to the imaginary surface including the plate surface of “a” and the plate surface of the plate-like member 23b has an angle of 3.8 ± 2 degrees. 2
It is inclined to move away from 1a. Then, as shown in FIG. 1, when the terminal fittings 17 are arranged in the insulating case 7, the plate-like member 23b is pressed by the soldering portion 5 via the projections 23c. (Substantially parallel to the virtual surface 24). As a result, the plate-like member 23b, together with the curved portion 23a, also has the projection 23c.
.. Are pressed against the soldering portion 5.

As shown in detail in FIG. 2C, the projections 23c are arranged at predetermined intervals in the circumferential direction at the inner edge of the opening 23b1 of the plate-like member 23b.
It protrudes in a direction inclined from the plate-like member 23b in the direction from 3b toward the soldering portion 5 (the direction away from the flat plate portion 21a). More specifically, the projections 23c...
At the same interval L on each of the four sides surrounding the
Are arranged one by one. Each projection 23c is a plate-like member 23.
It has a triangular shape whose width becomes narrower as it moves away from b. In this example, the plurality of protrusions 23c.
3c are inclined at an angle of 45 ± 5 degrees with respect to the plate surface of the plate member 23b so that the extension line passing through the tip of 3c... The tip of the projection 23c is the curved portion 23 described above.
The terminal fitting 17 is electrically and mechanically connected to the soldering portion 5 by biting into the soldering portion 5 by the spring force generated by the spring property of the a and the plate-like member 23b. The side 23b2 located on the opposite side of the side of the plate-like member 23b on the side of the curved portion 23a has two protrusions 2 protruding from the side 23b2.
3c are bent at the same angle.

When assembling the high-voltage variable resistor (electrical component), first, the insulating case 7 is set in a state where its opening is directed upward. Then, after inserting the terminal fitting 17, the operation shaft (not shown) and the slider into the inside of the insulating case 7,
The circuit board 1 having the soldered portion 5 is joined to the rib 7a of the insulating case 7. At that time, the curved portion 23a of the contact terminal portion 23 of the terminal fitting 17 is compressed (the curved portion 23a is deformed so that both ends of the curved portion 23a approach each other), and the plate-like member 23 is deformed.
b is deformed so as to be substantially parallel to the circuit board 1 and the projection 2
3c bite into the soldering portion 5.

In the above example, the present invention is applied to a high-voltage variable resistor, but the present invention can naturally be applied to other electric components. In the above example, the end of the first connection conductor 3 is located in the soldering portion 5, but the first connection conductor 3
May be projected from the soldering portion 5.

In the above example, eight protrusions 23c are used, but the number of protrusions 23c may be two or more. When two projections are used, the two projections may be arranged so that the two projections face each other with the vertex of the soldering portion 5 interposed therebetween. Also, the plate-like member 23b of the above example
The opening 23b1 has a substantially rectangular shape, but the opening may be of various shapes such as a circle.

[0023]

According to the present invention, the metal plate is machined to form the terminal fitting integrally, and a part of the terminal fitting (contact terminal portion) is brought into direct contact with the soldering portion. Thus, the electrical connection between the first connection conductor and the second connection conductor can be performed without using a conductive elastic body. Therefore, the electric connection between the first connection conductor and the second connection conductor can be easily performed simply by disposing the terminal fitting in the insulating case, and the number of electric components can be reduced. In particular, in the present invention, since the contact portion of the terminal fitting that comes into contact with the soldering portion to which the first connection conductor is soldered is constituted by a plurality of protrusions that bite into the soldering portion by spring force, the terminal fitting and the soldering portion Can be reliably connected.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of an example of an embodiment in which an electric component of the present invention is applied to a high-voltage variable resistor.

2A is a front view of a terminal fitting used in the embodiment of the present invention, FIG. 2B is a right side view of FIG. 2A, and FIG. 2C is a bottom view of FIG. 2A. .

FIG. 3 is a cross-sectional view of a main part of an output terminal structure used in an electric component of a conventional high-voltage variable resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation case 3 1st connection conductor 5 Solder part 7 Insulation case 13 2nd connection conductor 15 Connection conductor introduction part 17 Terminal fitting 21 Conductor clamping part 23 Contact terminal part 23a Curved part 23b Plate-shaped member (contact support part) 23c: Multiple protrusions (contact points)

Claims (10)

[Claims] 1. A soldering electrode having a through hole into which a first connection conductor is inserted from the back side, and an end of the first connection conductor inserted through the through hole into the front surface by soldering. A circuit board having a circuit pattern including: a substrate storage chamber having an opening on one side; and a connection formed on a wall surrounding the substrate storage chamber and introducing an end of a second connection conductor into the substrate storage chamber from outside. An insulating case having a conductor introduction portion; and a circuit board disposed so as to face the inside of the substrate housing chamber of the insulating case and the wall surrounding the substrate housing chamber. The terminal fitting is formed integrally with the metal plate by machining the metal plate, and the terminal fitting is formed on the wall surrounding the substrate storage chamber of the insulating case. Fitted to the terminal fitting fitting part and A conductor holding portion for holding the end of the second connection conductor inserted into the substrate storage chamber from the connection conductor introduction portion, and a solder for soldering and connecting the first connection conductor and the soldering electrode; A contact terminal portion having a contact portion that comes into contact with the attachment portion, wherein the contact terminal portion is provided in a state where the terminal fitting is disposed between the circuit board and the wall portion surrounding the board storage chamber. The contact portion is configured to generate a spring force for pressing the contact portion against the soldering portion, the contact terminal portion has a contact support portion for supporting the contact portion, and the contact portion is provided on the contact support portion. The plurality of protrusions are supported and bite into the soldering portion by the spring force, and the plurality of protrusions are supported by the contact supporting portion at circumferential intervals so as to surround the periphery of the soldering portion. Is characterized by Care parts. 2. The contact support portion is located above the soldering portion, and is disposed so as to surround an imaginary perpendicular line orthogonal to the surface of the circuit board and passing through a top of the soldering portion. The electric component according to claim 1, comprising an annular plate-shaped member, wherein the plurality of protrusions are supported on an inner edge of the annular plate-shaped member at intervals in a circumferential direction. 3. The electrical component according to claim 2, wherein the plurality of protrusions have a shape that becomes narrower as the distance from the plate-like member increases. 4. The electric device according to claim 3, wherein the plate-like member has a rectangular annular shape having four sides, and the plurality of protrusions are separately arranged on the four sides. parts. 5. The electric component according to claim 4, wherein two of the protrusions are arranged on each of the four sides, and the protrusions have a triangular shape. 6. A soldering electrode having a through hole into which a first connection conductor is inserted from the back side, and an end of the first connection conductor inserted through the through hole into the front surface by soldering. A circuit board having a circuit pattern including: a substrate storage chamber having an opening on one side; and a connection formed on a wall surrounding the substrate storage chamber and introducing an end of a second connection conductor into the substrate storage chamber from outside. An insulating case having a conductor introduction portion; and a circuit board disposed so as to face the inside of the substrate housing chamber of the insulating case and the wall surrounding the substrate housing chamber. The terminal fitting is formed integrally with the metal plate by machining the metal plate, and the terminal fitting is formed on the wall surrounding the substrate storage chamber of the insulating case. Fitted to the terminal fitting fitting part and A conductor holding portion for holding the end of the second connection conductor inserted into the substrate storage chamber from the connection conductor introduction portion, and a hemisphere for soldering and connecting the first connection conductor and the soldering electrode; A contact terminal portion having a contact portion that comes into contact with a soldering portion having a shape, wherein the contact terminal portion has the terminal fitting disposed between the circuit board and the wall portion surrounding the board storage chamber. In the state, the contact portion is configured to generate a spring force for pressing the solder portion, the contact terminal portion has a contact support portion for supporting the contact portion, the contact support portion, It is comprised from the plate-shaped member located above the soldering part and arranged so as to surround the upper end part of the soldering part, and the contact part is formed so as to surround the periphery of the upper end part of the soldering part. The spring supported by a plate-shaped member; In electrical components, characterized by being composed of a plurality of protrusions wherein the pressed against the soldering tip portion is inclined so as to bite into the soldering portion. 7. The electrical component according to claim 6, wherein the plurality of protrusions have a shape that becomes narrower as the distance from the plate-like member increases. 8. A soldering electrode having a through hole into which a first connection conductor is inserted from the back side, and an end of the first connection conductor inserted through the through hole into the front surface by soldering. A circuit board having a circuit pattern including at least one variable resistor circuit; a board storage chamber having an opening on one side; and a second connection formed in a wall surrounding the board storage chamber from the outside and into the board storage chamber. An insulating case having a connection conductor introduction portion for introducing an end of a conductor; and the circuit board and the substrate storage chamber disposed so as to face the surface inside the substrate storage chamber of the insulating case. A terminal fitting disposed between the circuit board and a wall disposed in the substrate storage chamber of the insulating case; and a slider disposed between the surface of the circuit board and the inner wall of the insulating case. High voltage variable resistor The terminal fittings are formed integrally by machining a metal plate by machining, and the terminal fittings are fitted with terminal fittings formed on the wall surrounding the substrate storage chamber of the insulating case. A conductor holding portion fitted to the portion and holding the end portion of the second connection conductor inserted into the substrate storage chamber from the connection conductor introduction portion; the first connection conductor and the soldering electrode; A contact terminal portion having a contact portion that comes into contact with a hemispherical soldering portion that is connected by soldering, wherein the contact terminal portion is configured such that the terminal fitting surrounds the circuit board and the board storage chamber. It is configured to generate a spring force for pressing the contact portion against the soldering portion in a state where the contact terminal portion is disposed between the contact terminal portion and the contact terminal portion. The contact support portion is formed of the soldering portion. And the contact portion is supported by the plate-like member so as to surround the periphery of the upper end of the soldering portion. A high-voltage variable resistor, comprising: a plurality of projections, the tip of which is bent and pressed into the soldering portion by the force of the spring force so as to bite into the soldering portion. 9. The plate-shaped member has an annular shape that is arranged so as to surround a virtual perpendicular line that is orthogonal to the surface of the circuit board and that passes through a top of the soldering portion. 9. The high-voltage variable resistor according to claim 8, wherein the protrusions are supported on an inner edge portion of the annular plate-shaped member at intervals in a circumferential direction. 10. The plate-like member has a rectangular annular shape having four sides, and the plurality of protrusions are arranged two by two on each of the four sides. The variable resistor for high voltage according to claim 9, wherein the projection has a triangular shape whose width dimension becomes narrower as the projection gets away from the plate-shaped member.