KR100255487B1 - Structure for attaching terminals - Google Patents

Abstract

The present invention provides a terminal attachment structure capable of responding to a narrow pitch by attaching a plurality of terminals to a substrate once, and for this purpose, a rigid piece 15a which becomes a clip by punching a metal plate having abundant elasticity such as phosphor bronze and the like. The terminal 15 comprised by the elastic piece 15b and the each piece 15c extended from the said clip part is obtained. Here, these rigid pieces 15a are on the same plane as each of the elastic pieces 15b and the plate pieces 15c, and the outlines of the terminals 15 are all cut surfaces. The terminals 15 are retained by supplying the plurality of terminals 15 configured as described above to the molding die and storing the clip portions of the terminals 15 in the grooves 20a provided in the upper mold 2 at the time of mold closing. Extrapolated to (18), and integrally held in the state in which the plate surfaces of the terminals 15 are arranged vertically on the holder 18 so as to face each other. Then, the substrate 14 is sandwiched between the rigid pieces 15a and the elastic pieces 15b of each terminal 15, and the snap pieces 18a formed on both sides of the holder 18 are fixed to the substrate 14. When the cut surface of the rigid piece 15a is in contact with the back surface of the substrate 14, the elastic pieces 15b are bent to elastically contact the surface of the substrate 14, so that each terminal 15 has a It adheres to the board | substrate 14 in the state electrically connected to the connection part 16a (or 17a) of the resistance pattern 16 formed in the surface, and the current collector pattern 17. As shown in FIG.

Description

Terminal Attachment Structure

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal attachment structure to a substrate provided in an electrical component such as a variable resistor, and relates to a terminal attachment structure using a clip-shaped terminal.

For example, in a variable resistor, a resistor and a current collector are formed on the surface of the substrate, and a change of the resistance value is detected from the ends of the resistor and the current collector by moving the sliding element on the substrate. A plurality of terminals connected to the ends are attached. Conventionally, such a terminal attaching structure is known by ring caulking or soldering a terminal onto a substrate. However, these terminals are difficult to work with and thus unsuitable for automation. Moreover, as a terminal attachment structure which does not require these ring caulking and soldering operations, it is known to use a clip-shaped terminal as described in Japanese Patent Application Laid-Open No. 2-118902.

9 is an exploded perspective view showing a conventional terminal attachment structure using such a clip-shaped terminal, and FIG. 10 is a sectional view of the terminal attachment structure. As shown in these figures, the resistance pattern 2 and the current collecting pattern 3 are formed concentrically on the surface of the substrate 1, and Ag or the like is formed at the ends of the resistance pattern 2 and the current collecting pattern 3. The connection parts 2a and 3a which consist of electroconductive materials are apply | coated. A terminal 4 is connected to each of the connecting portions 2a and 3a, respectively, and these terminals 4 each have an elastic operation 4a for holding and holding the substrate 1 and each piece extending backward from the elastic piece 4a. 4b), the elastic piece 4a and each piece 4b are integrally formed with the metal plate. The elastic pieces 4a are branched into three parts, bent in opposite directions to the central elastic pieces 4a and the two elastic pieces 4a on both sides, and are generally formed in a clip shape. When the clip-shaped elastic pieces 4a of the respective terminals 4 are inserted into the substrate 1, the two elastic pieces 4a are elastically contacted with the connecting portion 2a (or 3a) and the central elastic pieces Since 4a is in elastic contact with the back surface of the board | substrate 1, each terminal 4 is attached to the board | substrate 1 in the state electrically connected to the corresponding connection part 2a (or 3a).

By the way, the terminal 4 attached to the board | substrate 1 is required by the number of connection parts 2a and 3a, and when one terminal 4 is attached to the board | substrate 1 one by one, since workability is bad, all the required It is desired to integrate the terminal 4 into the holding body by extrapolation in advance, and to attach all the terminals 4 to the substrate 1 at one time.

However, in the above-described conventional terminal attachment structure, the clip portion of the terminal 4 holding the substrate 1 is formed into a complicated shape composed of three elastic pieces 4a bent by folding the ends of the respective pieces 4b in opposite directions. Therefore, it was difficult to extrapolate the holding body by supplying the terminal 4 to the molding die. Moreover, since the plate surface of each elastic piece 4a is elastically contacting the surface or the back surface of the board | substrate 1, there is a limit in reducing the width dimension of each elastic piece 4a, and each elastic piece 4a mutually Since it is bent differently and formed in the shape of a clip, it is difficult to make the width dimension of the whole terminal 4 small, and there existed a problem that it could not cope with narrow pitch of connection part 2a, 3a.

According to the present invention, the terminals are formed in a flat plate shape so that the clip portion and each piece are located in the same plane, and the terminals are arranged vertically with each plate surface facing each other to be held in the holder. With such a configuration, all the required terminals can be integrated into the holder in advance by extrapolation without interrupting the clip portion of the terminal in the mold closing or mold opening direction of the molding die when the holder is extrapolated. Moreover, since the board surface of each terminal and board | substrate is substantially orthogonal in the state which attached each terminal to the board | substrate, it can respond to narrow pitch of a connection part.

1 is a cross-sectional view of a variable resistor according to an embodiment of the present invention;

2 is a front view of the variable resistor,

3 is a front view illustrating an attachment state of a substrate and a terminal provided in the variable resistor;

4 is a front view of the terminal,

5 is an explanatory diagram showing spring characteristics of the terminal;

6 is a plan view of a holding body in which the terminal is integrated;

7 is a front view of the holder;

8 is a sectional view showing a molding die of the holder;

9 is an exploded perspective view showing a conventional terminal mounting structure;

10 is a sectional view of the terminal attachment structure.

<Description of the symbols for the main parts of the drawings>

10: frame 10b: freestanding angle

14: board 15, 20: terminal

15a, 20a: rigid body piece 15b, 20b: elastic piece

15c, 20c: Each piece 16: Resistance pattern

17: current collecting pattern 16a, 17a: connection

18: Retainer 18a: Snap Piece

18b: projection 19: printed circuit board

20: Pictograph 20a: Home

21: lower mold

In the structure with a terminal of this invention, the board | substrate with a conductive pattern was formed, the some board | substrate made of the metal plate connected to the connection part of the said conductive pattern, and the holding body made from synthetic resin extrapolated to these terminals, The said terminal is a said board | substrate. The clip part which hold | maintains and hold | maintains and each piece extended from the said clip part exists in the same plane, and these terminals were hold | maintained in the said holding body so that the board surface might mutually face. With this configuration, all the terminals required can be attached to the substrate at once, and the narrow pitch of the connecting portion can be coped with, and the terminals can be easily formed by punching a metal flat plate.

The said board | substrate can be used as circuit boards, such as a variable resistor and various switches, For example, a variable resistor is a resistor board, and in the case of various switches, it is a switch board. The number of the conductive patterns can be appropriately increased or decreased as necessary. For example, in the case of a resistor plate, a pair of a resistance pattern and a current collecting pattern, which are conductive patterns, can be appropriately increased or decreased depending on the number of years of the resistance circuit.

The clip portion may have any shape as long as it is formed in the same plane as each piece. In particular, when the clip portion is composed of rigid pieces and elastic pieces opposite to the pieces, the terminals and the substrate are positioned with respect to the rigid pieces, Relative position accuracy can be increased.

In addition, if a plurality of regulating projections opposing both front and rear surfaces of the substrate are provided in the holding body, the relative positional displacement of the substrate and the holding body is prevented by the regulating protrusion, so that excessive force is not applied to the clip portion of the terminal, and thus good contact is achieved. State can be maintained.

In addition, when the snap pieces are provided on both sides of each terminal in the holder, and the snap pieces are hung on both edges of the board, the attachment work of each terminal is simplified, and the holder and the terminal and the board are relative to each other. Since the position does not change, the contact reliability can be increased.

Moreover, if the frame body which supports the said board | substrate is provided, and the control part which prevents the spread of the said snap piece is provided in this frame body, it can prevent that a holding body falls from a board | substrate by an external force. Although this regulation part may be dedicated, when using the independence angle which makes a frame body stand on a printed board as a regulation part, the mechanical strength of a regulation part can be raised and the complexity of a structure can be prevented.

(Example)

1 is a cross-sectional view of a variable resistor according to an embodiment, FIG. 2 is a front view of the variable resistor, and FIG. 3 shows a state of attachment of a substrate and a terminal provided in the variable resistor. Front view, FIG. 4 is a front view of the said terminal, FIG. 5 is explanatory drawing which shows the spring characteristic of the said terminal, FIG. 6 is a top view of the holder which integrated the said terminal, FIG. 7 is a front view of the said holder, FIG. 8 Is a cross-sectional view showing a molding die of the holder.

As shown in FIG. 1 and FIG. 2, the variable resistor according to the embodiment includes an operating body 11 made of a synthetic resin rotatably supported by the metal plate frame 10 and the frame body 10, and an operating body ( 11) a click spring 12 which gives a click feeling to the slider 11, a slider plate 13 attached to the operating body 11, a substrate 14 fixed to the frame 10, and a substrate 14 attached to the substrate 10. It is mainly comprised by the some terminal 15 and the holding body 18 made from the synthetic resin which hold | maintains these terminals 15. As shown in FIG.

The stopper 10a which protrudes inward is formed in the side surface of the frame 10, The one surface which opposes through this side surface is opened, and a pair of self-supporting angle 10b protrudes from the open end. On the other side of the frame 10, the cylindrical bearing portion 10c is protruded and at the same time, the ring-shaped click spring 12 hangs inside. The circumferential shaft portion 11a and the receiving portion 11b having a larger diameter than the shaft portion 11a are integrally formed in the operating body 11, and the receiving portion 11a is formed from the bearing portion 10c by the frame body 10. Protruding outward. A small diameter projection 11c is formed at the tip of the receiving portion 11b, and the projection 11c is fitted into a round hole 14a provided in the substrate 14. In the embodiment, two slider plates 13 are fixed to the receiving portion 11b by means of caulking or the like, and two slider pieces 13a are formed on each slider plate 13, respectively. The operating body 11 can rotate the bearing portion 10c of the frame body 10 and the round hole 14a of the substrate 14 as a guide portion, but not shown projections formed on the circumferential surface of the receiving portion 11b. The rotation angle is regulated within 360 degrees by contacting the stopper 10a. In addition, when the operating body 11 is rotated, the convex portion of the click spring 12 retracts from the concave portion (not shown) formed in the receiving portion 11b to generate a click feel.

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 resistance patterns 16 and two current collecting patterns 17 are used for dual use. Is formed. These resistance patterns 16 and current collector patterns 17 are arranged concentrically around the round hole 14a, and the outer two resistance patterns 16 and current collector patterns 17 on one slider plate. Two slider pieces 13a formed in (13) slide, respectively, and two slider pieces 13a formed on the other slider plate 13 on the inner two resistance patterns 16 and the current collecting pattern 17. Each slides. Each resistance pattern 16 and current collector pattern 17 are surrounded by the edge of the substrate 14, and connecting portions 16a and 17a made of a conductive material such as Ag are formed at their ends. Terminals 15 are connected to each of the connecting portions 16a and 17a, respectively, and as described later, each terminal 15 is provided on the substrate 14. Each terminal 15 is integrated with the holding body 18 made of synthetic resin by extrapolation, and the holding body 18 is fixed to the substrate 14 using both snap pieces 18a. In addition, the substrate 14 is fixed to an open surface of the frame 10 by appropriate means such as caulking, but as shown in FIG. 2, the substrate 14 is formed outside the snap piece 18a of the holder 18. Since the independence angle 10b is located, the snap piece 18a does not spread outward, and the falloff from the substrate 14 of the holder 18 and each terminal 15 is prevented.

As shown in Fig. 4, the terminal 15 is formed by punching a metal plate having abundant elasticity such as phosphor bronze with a press, and having an L-shaped rigid piece 15a and an elastic piece 15b constituting the clip portion, Each piece 15c extends linearly from this clip part. In addition, the terminal 15 after pressing is subjected to plating treatment such as tin plating on the entire surface including the cut surface to ensure contact reliability and good solderability. Each plate surface of these rigid piece 15a, the elastic piece 15b, and each piece 15c is in the same plane, and the outline of the terminal 15 is a cut surface. The elastic pieces 15b are turned at the inverting part in the middle, and their ends are opposed to the rigid pieces 15a at predetermined intervals, and this gap is set smaller than the thickness dimension of the substrate 14. Therefore, this elastic piece 15b is small in size and the spring span from its base end to the tip end is set long enough.

As shown in Figs. 6 and 7, the plurality of terminals 15 are extrapolated in a state in which the respective plate surfaces are arranged vertically so as to face each other, and the connecting portion of the rigid pieces 15a and the elastic pieces 15b is formed in the holding body ( Each terminal 15 is integrally held by the holding body 18 by being embedded in 18). The snap piece 18a is integrally formed at both ends of the holder 18, and in the embodiment, four restricting protrusions 18b are provided. In addition, the arrangement pitches of the terminals 15 are connected to each connection portion ( It is set almost the same as the arrangement pitch of 16a, 17a). Among these protrusions 18b, a space equal to or slightly wider than the plate thickness of the substrate 14 is secured between the outer two protrusions 18b and the inner two protrusions 18b.

As shown in FIG. 8, the molding die of the holder 18 includes an upper mold 20 and a lower mold 21, and the upper mold 20 includes a plurality of grooves 20a along the mold opening direction. These grooves 20a reach the putting line PL. Therefore, during extrapolation of the retainer 18, the clip portion of each terminal 15 is accommodated in the groove 20a and does not interfere with the mold closing and mold opening directions of the upper mold 20. The holding body 18 which integrated each terminal 15 can be shape | molded by putting the lower mold | type 21 in the putting line PL shown by the dashed-dotted line of FIG. In addition, although the groove | channel 20a is provided only in the upper mold | type 20 in an Example, you may provide the groove | channel for the elastic mold | type 15b and the lower mold | type 21 in order to avoid contact.

Thus, when attaching each terminal 15 integrated in the holding body 18 to the board | substrate 14, the board | substrate 14 is sandwiched between the rigid piece 15a and the elastic piece 15b of each terminal 15, Both snap pieces 18a of the holder 18 are fixed to the substrate 14. As a result, the cut surface of the rigid piece 15a abuts on the back surface of the substrate 14, and at the same time the elastic piece 15b is bent to elastically contact the surface of the substrate 14, so that the terminal 15 has a corresponding connecting portion 16a ( Or it is attached to the board | substrate 14 in the state electrically connected to 17a, and the board | substrate 14 is sandwiched between each protrusion 18b of the holding body 18 in the site other than the connection parts 16a and 17a. At this time, the substrate 14 is pressed against the cutting surface of the rigid piece 15a by reaction force due to the bending of the elastic piece 15b, and the rigid piece 15a does not deform with this sufficiently large rigidity in this direction. The relative position of 14 and the terminal 15 is accurately positioned with respect to the rigid piece 15a. Since the projections 18b are opposed to both front and back surfaces of the substrate 14, even if an external force acting to deform the substrate 14 acts, the deformation is prevented by the projections 18b. The clip portion (the rigid piece 15a and the elastic piece 15) is not subjected to excessive force, and a good contact state can be maintained. In addition, since each part of the terminal 15 is formed in a flat shape, the cutting surface in the plate thickness direction is exposed along the arrangement direction of the connecting portions 16a and 17a, so that the board surfaces of the substrate 14 and the respective terminals 15 are approximately equal to each other. It is affixed in orthogonal state, and can respond to narrow pitch of connection part 16a, 17a. In addition, when the elastic piece 15b is bent in this manner, the bending stress is concentrated on the inverted portion of the elastic piece 15b, and thus the rolling direction of the metal flat plate as a raw material when punching the terminal 15 is indicated by the arrow AA in FIG. Direction is set.

Fig. 5 is an explanatory diagram showing spring characteristics when a phosphor bronze plate having a plate thickness of 0.3 mm is used as a raw material of the terminal 15, wherein the horizontal axis is the amount of warpage of the elastic piece 15b, and the vertical axis is the elastic piece 15b. The pressure is shown. As is apparent from the figure, the elastic piece 15b has a pressure of about 150 g with a deflection amount of 0.2 mm, which is a use height, so that a contact pressure can be obtained that does not cause practical problems.

As shown in FIG. 1, the variable resistor configured as described above is mounted on the printed circuit board 19 using a pair of self-supporting angles 10b, and each piece 15c of each terminal 15 is a printed circuit board 19. As shown in FIG. Solder is soldered to the land portion (not shown). 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 collector pattern 17, and according to the sliding position. The change in the resistance value is detected via each terminal 15.

In addition, the shape of the clip part of the terminal 15 is not limited to the said embodiment, It is possible to employ | adopt various modifications, For example, the rigid piece 15a and the elastic piece 15b are made into the same shape, and the board | substrate ( The clip portions of the terminals 15 may be elastically brought into contact with both front and back surfaces of 14).

In addition, in the above embodiment, the operating body 11 has been described with an example of a horizontal zone type variable resistor that is horizontal with respect to the printed circuit board 19. However, when each side 15c of the terminal 15 is bent at a right angle, the operating body 11 Can also be applied to a vertical type variable resistor perpendicular to the printed board 19.

This invention is implemented in the form as described above, and has the effect as described below.

A plurality of terminals made of a metal plate connected to a substrate on which a conductive pattern is formed and a connection portion of the conductive pattern, and a retainer made of synthetic resin extrapolated to these terminals, the terminal including a clip portion for holding the substrate and the If each piece extending from the clip part is in the same plane, and these terminals are held on the holder so that the plate surfaces thereof face each other, all the necessary terminals can be integrated into the holder, so that the operation of attaching each terminal to the substrate is difficult. Simultaneously, it is possible to cope with narrow pitch of the connecting portion, and the terminal can be easily formed by punching a metal flat plate.

In addition, if the clip part is composed of rigid pieces and elastic pieces opposed thereto, the relative positioning accuracy of each terminal and the board can be increased since the terminals and the board are positioned based on the rigid pieces.

Moreover, when the said holding body is provided with the some regulating protrusion which opposes the front and back surfaces of a board | substrate, since the relative position shift of a board | substrate and a holding body is prevented by a control protrusion, an excessive force is not applied to the clip part of a terminal, and a favorable contact is carried out. State can be maintained.

In addition, when the snap pieces are provided on both sides of each terminal in the holder, and the snap pieces are stopped on both edges of the board, the attachment of each terminal is simplified and the relative positions of the holder, the terminal, and the board. Since it does not change, the reliability of contact can be improved.

Moreover, if the frame body which supports the said board | substrate is provided, and the control part which prevents the spread of the said snap piece is provided in this frame body, it can prevent that a holding body falls from a board | substrate by an external force. Although this control part may be dedicated, when using the independence angle which makes a frame body stand on a printed board as a control part, the mechanical strength of a control part can be improved and structure complexity can be prevented.

Claims (6)

A substrate having a conductive pattern formed thereon, a plurality of terminals made of a metal plate connected to the connecting portion of the conductive pattern, and a retainer made of synthetic resin extrapolated to these terminals, wherein the terminal includes a clip portion for holding the substrate. And each piece arranged from the clip portion in the same plane, and the terminals are held in the holder so that the plate surfaces thereof face each other. The terminal attachment structure according to claim 1, wherein the holder is provided with a plurality of regulating protrusions opposing both front and back sides of the substrate. The terminal attachment structure according to claim 1, wherein snap pieces which are located on both sides of the respective terminals are provided in the holder, and these snap pieces hang on both edges of the substrate, respectively. 4. The terminal attachment structure according to claim 3, comprising a frame body for supporting the substrate, and a restricting portion for preventing diffusion of the snap pieces in the frame body. 5. The terminal attachment structure according to claim 4, wherein the restricting portion is a self-supporting angle that freezes the frame body on a printed board. 2. The terminal attachment structure according to claim 1, wherein the clip portion is composed of a rigid piece in contact with one surface of the substrate and an elastic piece in elastic contact with the other surface of the substrate.