JPH10294201A - Terminal attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal attachment structure capable of coping with pitch narrowing by increasing positioning accuracy between a terminal and a board. SOLUTION: By punching a metallic plate forming of phosphor bronze, etc., which is elasticity-rich, a terminal 15 is obtained, which comprises a rigid piece 15a with resistance to deformation, an elastic piece 15b with an inversion on the way, and a leg piece 15c which extends linearly from a connection part between the rigid piece 15a and the elastic piece 15b. The respective plate faces of the rigid piece and the elastic piece, and the leg piece are flush, and the contour of the terminal 15 is entirely cut surface. Fitting a board 14 between the rigid piece 15a and the elastic piece 15b, since the elastic piece 15b springs against the surface of the board 14 by bending, while the cut surface of the rigid piece 15a abuts with the back surface of the board 14, the terminal 15 can be attached to the board 14 in electrically connection with a connection part 16a (or 17a) of a resistance pattern 16 and a collector pattern 17 formed on the surface of the board 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate with terminals provided on an electric component such as a variable resistor, and more particularly, to a structure for attaching the terminals to the substrate.

[0002]

2. Description of the Related Art In a variable resistor, for example, a resistor and a current collector are formed on the surface of a substrate. A change in the value is detected, and a plurality of terminals connected to ends of the resistor and the current collector are attached to the substrate. Conventionally, as a mounting structure for such terminals,
There are known terminals in which a terminal is swaged or soldered to a substrate, but these are not suitable for automation due to a difficulty in workability. In addition, as a terminal mounting structure that eliminates the need for eyelet caulking and soldering work, Japanese Unexamined Utility Model Application Publication No.
As described in Japanese Unexamined Patent Application Publication No. H10-209, a device using a clip-shaped terminal is known.

FIG. 13 is an exploded perspective view showing a conventional terminal mounting structure using such a clip-shaped terminal, and FIG. 14 is a sectional view of the terminal mounting structure. As shown in these figures,
A resistance pattern 2 and a current collecting pattern 3 are formed concentrically on the surface of the substrate 1, and connection portions 2 a and 3 a made of a conductive material such as Ag are formed at the ends of the resistance pattern 2 and the current collecting pattern 3. It has been applied. Terminals 4 are connected to the connecting portions 2a and 3a, respectively. These terminals 4 have an elastic piece 4a for holding the substrate 1 and a leg 4b extending rearward from the elastic piece 4a. The leg piece 4b is integrally formed from a metal plate. The elastic piece 4a is branched into three parts, and the central elastic piece 4a and the two elastic pieces 4a on both sides are bent in directions opposite to each other, and are formed in a clip shape as a whole. When the clip-like elastic pieces 4a of the terminals 4 are fitted into the substrate 1, two elastic pieces 4a on both sides are formed.
Resiliently contacts the connecting portion 2a (or 3a), and the central elastic piece 4
Since a is elastically in contact with the back surface of the substrate 1, each terminal 4 is attached to the substrate 1 while being electrically connected to the corresponding connection portion 2a (or 3a).

[0004]

However, in the terminal mounting structure using the conventional clip-shaped terminal described above,
At the tip of the terminal 4, three elastic pieces 4 a bent in opposite directions are formed, and these elastic pieces 4 a are elastically contacted on both the front and back surfaces of the substrate 1. There has been a problem that the substrate 1 tends to fluctuate in the thickness direction, and it is difficult to improve the positional accuracy between the leg 4b of the terminal 4 and the substrate 1. Further, since the plate surface of each elastic piece 4a is in elastic contact with the front surface or the back surface of the substrate 1, there is a limit in reducing the width dimension of each elastic piece 4a, and each elastic piece 4a is bent alternately. Since the terminal 4 is formed in a clip shape, the width of the entire terminal 4 cannot be reduced, and there is a problem that the pitch of the connecting portions 2a and 3a cannot be reduced.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a terminal has a rigid piece having a cut surface of a metal plate and an elastic piece which is more easily elastically deformed than the rigid piece. The cut surface of the rigid piece is brought into contact with one surface of the substrate, and the elastic piece is brought into elastic contact with the other surface of the substrate. With this configuration,
The board is pressed against the cut surface of the rigid piece by receiving the elastic force from the elastic piece, and the rigid piece is hardly bent, so that the positional accuracy of the terminal leg and the board can be improved, and Since the rigid body piece is in contact with the board surface so that its plate surface is substantially perpendicular to one surface of the substrate, the width of the entire terminal can be reduced, and it is possible to cope with a narrow pitch of the connection portion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The terminal mounting structure of the present invention includes a substrate on which a conductive pattern is formed, and a plurality of terminals made of a metal plate connected to a connection portion of the conductive pattern. A rigid piece having a cut surface in contact with one surface of the substrate, an elastic piece elastically in contact with the other surface of the substrate, and a leg extending from the rigid and elastic pieces are provided.

The board can be used as a circuit board for a variable resistor, various switches, and the like. For example, a variable resistor is a resistor board, and various switches are a switch board. In addition, the number of the conductive patterns can be appropriately increased or decreased as necessary. For example, in the case of a resistor substrate, the number of pairs of a conductive pattern, that is, a resistor pattern and a current collecting pattern, is appropriately increased or decreased according to the number of resistor circuits connected. can do.

The elastic piece may be formed in any manner as long as it is more flexible than the rigid piece. For example, the elastic piece may be formed by bending a part of the rigid piece through a bent portion. The plate surface of the elastic piece can be elastically contacted with the other surface of the substrate.
In this case, when the portion of the elastic piece that elastically contacts the substrate and the cut surface of the rigid piece are aligned, the elastic force from the elastic piece can be efficiently applied to the cut surface of the rigid piece.

Further, when the rigid body piece, the elastic piece and the leg pieces are formed so that all the plate surfaces are located on the same plane, complicated bending is not required, and the terminal is formed only by punching a metal flat plate. Can be formed. In this case, the shape of the elastic piece may be any shape as long as the elastic piece is more easily elastically deformed than the rigid body piece. When the elastic piece is opposed to the rigid piece, the spring span required for the elastic piece can be made sufficiently long and the size can be reduced.

[0010] Further, when a protrusion is formed on the terminal at a predetermined distance from the rigid piece and the cut surface of the protrusion is brought into contact with the other surface of the substrate, both surfaces of the substrate have high rigidity. Since the position is regulated by the portion, the overload is less likely to be applied to the elastic piece, and the reliability of the contact can be more reliably maintained.

[0011]

Embodiments will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a variable resistor according to an embodiment, FIG. 2 is a front view of the variable resistor, FIG. 3 is a front view showing a mounting state of a board and terminals provided in the variable resistor, and FIG. It is a front view of a terminal.

As shown in FIGS. 1 and 2, the variable resistor according to the present embodiment includes a frame 10 made of a metal plate, and an operating body 11 made of a synthetic resin rotatably supported by the frame 10. , Operation body 1
1 includes a click spring 12 for giving a click feeling, a slider plate 13 attached to the operating body 11, a board 14 fixed to the frame 10, and a plurality of terminals 15 attached to the board 14. It is mainly composed.

A stopper 10a protruding inward is formed on a side surface of the frame body 10, and one surface facing the other is opened through this side surface, and a pair of self-standing legs 10b protrude from the open end. A cylindrical bearing 10c protrudes from the other surface of the frame 10, and a ring-shaped click spring 12 is locked inside. The operating body 11 is integrally formed with a cylindrical shaft portion 11a and a receiving portion 11b having a larger diameter than the shaft portion 11a, and the shaft portion 11a protrudes outward from the frame 10 from the bearing portion 10c. A small-diameter projection 11c is formed at the tip of the receiving portion 11b.
4 is fitted in a circular hole 14a formed in the hole. Receiving part 11b
In this embodiment, two slider plates 13 are fixed by caulking or the like, and each slider plate 13 is formed with two slider pieces 13a. The operating body 11 is rotatable using the bearing 10c of the frame 10 and the circular hole 14a of the substrate 14 as guides, but the projection (not shown) formed on the peripheral surface of the receiving portion 11b comes into contact with the stopper 10a. The rotation angle is regulated within 360 degrees. Further, at the time of the rotation operation of the operation body 11, the click feeling is generated by the protrusion of the click spring 12 being disengaged from the recess (not shown) formed in the receiving portion 11b.

As shown in FIG. 3, a resistance pattern 16 and a current collecting pattern 17 are printed on the surface of the substrate 14.
In the embodiment, two resistor patterns 16 and two current collecting patterns 17 are formed for two consecutive use. The resistance pattern 16 and the current collecting pattern 17 are arranged concentrically around the circular hole 14a.
6 and the current collector pattern 17, two slider pieces 13 a formed on one slider plate 13 respectively slide, and the other sliders on the inner two resistance patterns 16 and the current collector pattern 17. Two slider pieces 13a formed on the plate 13 slide respectively. Each resistance pattern 16 and current collecting pattern 17 are routed to the edge of the substrate 14, and A
Connection portions 16a and 17a made of a conductive material such as g are formed. Terminals 15 are connected to the connection portions 16a and 17a, respectively, and the terminals 15 are attached to the substrate 14 as described later. Each terminal 15 is integrated with a holding member 18 made of synthetic resin by outsert molding, and the holding member 18 is fixed to the substrate 14 using snap pieces 18a on both sides. In addition, the substrate 14 is the frame 10
2 is fixed by an appropriate means such as caulking. However, as shown in FIG. 2, since the self-standing legs 10b of the frame body 10 are located outside the snap pieces 18a of the holding body 18, the snap pieces 18a The substrate 1 of the holder 18 does not spread outward.
4 is prevented from falling off.

As shown in FIG. 4, the terminal 15 is formed by stamping a metal plate having a high elasticity such as phosphor bronze with a press, and has an L-shaped rigid piece 15a.
And an elastic piece 15b opposed to the rigid piece 15a, and a leg 15c extending linearly from a connection portion between the rigid piece 15a and the elastic piece 15b. In addition, the terminal 15 after pressing is subjected to a plating process such as tin plating on the entire surface including the cut surface, so that contact reliability and good solderability are secured. The plate surfaces of the rigid piece 15a, the elastic piece 15b, and the leg piece 15c are in the same plane, and the outline of the terminal 15 is a cut surface. The direction of the elastic piece 15b is changed at the reversal part in the middle, and the tip thereof is opposed to the rigid piece 15a at a predetermined interval, and this interval is set smaller than the thickness dimension of the substrate 14. Therefore, the spring span from the base end to the distal end is set to be sufficiently long while the elastic piece 15b is small as a whole. The terminal 15 thus configured is outsert molded in a state where the respective plate surfaces are arranged so as to face each other,
The connecting portion between the rigid piece 15a and the elastic piece 15b is embedded in the holder 18 (see FIG. 3). At this time, the arrangement pitch of the terminals 15 is set to be substantially the same as the arrangement pitch of the connection portions 16a and 17a.

The rigid piece 15a and the elastic piece 15 of the terminal 15
b, when the substrate 14 is fitted, as shown in FIG.
Since the cut surface of the rigid piece 15a abuts on the back surface of the substrate 14 and the elastic piece 15b bends to elastically contact the surface of the substrate 14, the terminal 15 is connected to the corresponding connection portion 16a (or 17a).
Is attached to the substrate 14 in a state of being electrically connected to the substrate 14. At this time, the substrate 14 is pressed against the cut surface of the rigid piece 15a by a reaction force accompanying the bending of the elastic piece 15b, and the rigid piece 15a has sufficiently large rigidity and does not deform in this direction. The relative position of the terminal 15 is accurately positioned based on the rigid piece 15a. Each part of the terminal 15 is formed in a flat shape, and its cut surface in the thickness direction is connected to the connection parts 16a, 17
a, the substrate 14 and the terminals 1 are exposed.
The plate surfaces of No. 5 are mounted so as to be substantially orthogonal to each other, so that the pitch of the connection portions 16a and 17a can be reduced.
When the elastic piece 15b bends in this way, the bending stress is concentrated on the inverted portion of the elastic piece 15b. Therefore, when the terminal 15 is punched, the rolling direction of the metal flat plate as a raw material is changed by the arrow A in FIG. -Set in the A direction.

FIG. 5 is an explanatory view showing spring characteristics when a phosphor bronze plate having a thickness of 0.3 mm is used as a raw material of the terminal 15, the horizontal axis being the amount of deflection of the elastic piece 15b, and the vertical axis being the elasticity. The pressure of the piece 15b is shown. As can be seen from the drawing, the elastic piece 15b generates a pressure of about 150 g with a bending amount of 0.25 mm, which is the working height, and can obtain a contact pressure that does not cause a practical problem.

The variable resistor constructed as described above has the structure shown in FIG.
As shown in the figure, the leg 15c of each terminal 15 is soldered to a land portion (not shown) of the printed circuit board 19 by mounting it on the printed circuit board 19 using a pair of independent legs 10b. When the operating body 11 is rotated in this state, each slider piece 13a of both slider plates 13 slides on the corresponding resistance pattern 16 and current collecting pattern 17, and a resistance value corresponding to the sliding position is obtained. Is detected via each terminal 15.

FIG. 6 is a front view of a variable resistor according to another embodiment, FIG. 7 is a plan view of a holding body integrated with terminals provided in the variable resistor, FIG. 8 is a front view of the holding body, FIG. 9 shows FIG.
It is sectional drawing which follows the BB line of FIG.

In this embodiment, the elastic piece 15b of each terminal 15
A short protrusion 15d is formed at the base of the
The cut surface of d is opposed to the cut surface of the rigid piece 15a via a gap corresponding to the thickness of the substrate 14. When such a protrusion 15 d is formed on the terminal 15, the rigid piece 15 of the terminal 15 is formed.
When the board 14 is fitted between the elastic piece 15a and the elastic piece 15b,
Since the projection 15d and the rigid piece 15a abut on both the front and back surfaces of the substrate 14, the movement of the substrate 14 is
5d and the rigid piece 15a regulate the board 1
The elastic piece 15b elastically contacting the surface of the fourth member 4 is less likely to be overloaded. As a result, the elasticity of the elastic piece 15b is maintained for a long time, and the connecting portion 1 corresponding to the elastic piece 15b is maintained.
The reliability of contact between 6a (or 17a) can be more reliably maintained.

As shown in FIG. 9, most of the rigid piece 15a is buried in the holding member 18, so that the looseness of each terminal 15 with respect to the holding member 18 is prevented and the rigid piece 1
Since the rigidity of 5a itself is increased by the embedded portion of the holding body 18, the reliability of the contact between the elastic piece 15b and the corresponding connection portion 16a (or 17a) can be more reliably maintained from this point as well. . Further, as shown in FIG. 6, the tips of the snap pieces 18a provided on both sides of the holder 18 are locked to the substrate 14 and the frame 10, respectively, so that the holder 18 is more securely prevented from falling off. be able to.

Note that the shape of the terminal 15 is not limited to the above embodiments, and various modifications can be adopted. For example, corrugation is performed on the plate surface of the rigid piece 15a to increase the contact area between the cut surface of the rigid piece 15a and the substrate 14,
The reversing portion of the elastic piece 15b may be omitted to form a "-" shape in side view. Alternatively, as in the embodiment shown in FIGS. 10 and 11, the terminal 20 has a rigid piece 20 having a cut surface.
a, an elastic piece 20b bent at a substantially right angle to the rigid piece 20a, and a leg piece 20c extending linearly from a connection portion between the rigid piece 20a and the elastic piece 20b. When mounted on the substrate, the cut surface of the rigid piece 20a may be in contact with one surface of the substrate 14, and the plate surface of the elastic piece 20b may be in elastic contact with the other surface of the substrate 14. further,
As in the embodiment shown in FIG. 12, by offsetting the bent portion of the elastic piece 20b, the portion of the elastic piece 20b elastically contacting the substrate 14 and the cut surface of the rigid piece 20a are aligned. Is also good. In this case, since the elastic force from the elastic piece 20b acts toward the cut surface of the rigid piece 20a,
The mounting strength of the terminal 20 can be increased.

Further, in each of the above-described embodiments, the case where each terminal 15 is mounted on the substrate 14 in a state of being integrated with the holding member 18 in advance has been described. You may do it.

Further, in each of the above-described embodiments, the operating body 11 has been described by exemplifying a horizontal type variable resistor that is horizontal to the printed circuit board 19.
If c is bent at a right angle, it can be applied to a vertical type variable resistor in which the operating body 11 is perpendicular to the printed circuit board 19.

[0025]

The present invention is embodied in the form described above and has the following effects.

A rigid piece comprising a substrate on which a conductive pattern is formed, and a plurality of terminals made of a metal plate connected to a connection portion of the conductive pattern, wherein the terminal has a cut surface in contact with one surface of the substrate. And an elastic piece elastically contacting the other surface of the substrate, and a leg piece extending from the rigid piece and the elastic piece. Since the rigid piece is pressed hard and does not bend easily, the positional accuracy between the terminal leg piece and the substrate can be improved, and the rigid piece of the terminal is held so that its plate surface is substantially perpendicular to one surface of the substrate. Since the terminals are in contact with each other, the width dimension of the entire terminal can be reduced, and it is possible to cope with a narrow pitch of the connection portion.

When all the plate surfaces of the rigid piece, the elastic piece and the leg pieces are formed on the same plane, complicated bending is not required, and the terminal is formed only by punching a flat metal plate. Can be formed, in particular,
By forming a reversal part in the middle of the elastic piece and changing the direction, and making the tip of the elastic piece face the rigid piece, the spring span required for the elastic piece can be made sufficiently long and downsized. .

Also, a projection is formed on the terminal at a predetermined distance from the rigid piece, and a cut surface of the projection is brought into contact with the other surface of the substrate, so that both surfaces of the substrate have high rigidity. Since the position is regulated by the portion, the overload is less likely to be applied to the elastic piece, and the reliability of the contact can be more reliably maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a variable resistor according to an embodiment.

FIG. 2 is a front view of the variable resistor.

FIG. 3 is a front view showing a mounting state of a substrate and terminals provided in the variable resistor.

FIG. 4 is a front view of the terminal.

FIG. 5 is an explanatory diagram showing spring characteristics of the terminal.

FIG. 6 is a front view of a variable resistor according to another embodiment.

FIG. 7 is a plan view of a holder in which terminals provided on the variable resistor are integrated.

FIG. 8 is a front view of the holder.

FIG. 9 is a sectional view taken along the line BB of FIG. 7;

FIG. 10 is a perspective view of a terminal according to another embodiment.

FIG. 11 is an explanatory diagram showing a mounting state of the terminal.

FIG. 12 is an explanatory view showing an attached state of a terminal according to another embodiment.

FIG. 13 is an exploded perspective view showing a conventional terminal mounting structure.

FIG. 14 is a sectional view of the terminal mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Frame body 14 Substrate 15, 20 Terminal 15a, 20a Rigid piece 15b, 20b Elastic piece 15c, 20c Leg piece 15d Projection 16 Resistance pattern 17 Current collecting pattern 16a, 17a Connection 18 Holder 19 Printed board

Claims (6)

[Claims] 1. A substrate having a conductive pattern formed thereon, and a plurality of terminals made of a metal plate connected to a connection portion of the conductive pattern, wherein the terminal has a cut surface in contact with one surface of the substrate. A terminal mounting structure comprising: a rigid piece; an elastic piece elastically contacting the other surface of the substrate; and a leg piece extending from the rigid piece and the elastic piece. 2. The terminal mounting structure according to claim 1, wherein all plate surfaces of said rigid piece, said elastic piece and said leg piece are formed on the same plane. 3. The terminal mounting structure according to claim 2, wherein an inverted portion is formed in the middle of the elastic piece. 4. The terminal mounting structure according to claim 1, wherein the rigid piece, the elastic piece, and the leg piece are formed by punching a flat metal plate. 5. The elastic piece according to claim 1, wherein the elastic piece is connected to the rigid piece via a bent portion, and a plate surface of the elastic piece is in elastic contact with the other surface of the substrate. Terminal mounting structure. 6. The terminal according to claim 1, wherein a protrusion is formed on the terminal at a predetermined distance from the rigid piece, and a cut surface of the protrusion is brought into contact with the other surface of the substrate. A terminal mounting structure.