JP2017054844A - Electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic component which prevents a caulking piece of a cover folded to a lower surface of a case from protruding from the lower surface of the case and also prevents a molding defect of the case from being generated and further is capable of reducing a product height.SOLUTION: A rotary electronic component 1-1 comprises: a case 10 which is formed by exposing a circuit board 40 on a bottom face of a housing recess 11 provided on an upper surface; a rotor 60 which is housed in the housing recess 11 in a freely rotatable manner; detection means consisting of a slider 80 or the like which changes an output signal in response to the rotation of the rotor 60; and a cover 100 which is fitted to the upper surface of the case 10 and fixed to the case 10 by folding and locking a caulking piece 103 that extends downwards via an outer peripheral sidewall 15 of the case 10 into a caulking piece insertion recess 21 provided on a lower surface of the case 10. In the caulking piece insertion recess 21 into which the caulking piece 103 is locked, a lower surface 47 of the circuit board 40 is exposed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electronic component such as a rotary electronic component or a sliding electronic component.

  Conventionally, among rotating electronic components, for example, as shown in Patent Document 1, a rotating body (50) is rotatable in a housing recess (13) of a case (10) in which a circuit board (30) is insert-molded. The sliding element (31) of the circuit board (30) exposed in the bottom surface of the accommodating recess (13) is accommodated, covered with a cover (130), and attached to the rotating body (50). ) To change its electrical output. In the case of this type of rotary electronic component, the cover (130) is attached to the case (10) by bending the crimping piece (143) provided on the cover (130) to the lower surface of the case (10). .

JP 2011-243604 A JP 2008-28205 A

  However, as shown in FIG. 4 of Patent Document 1 above, when the crimping piece (143) of the cover (130) is bent to the lower surface of the case (10), the product height is increased by the thickness dimension of the crimping piece (143). Thus, there is a problem that miniaturization of the rotary electronic component is hindered. Further, since it is difficult to bend the caulking piece (143) accurately and horizontally, when the lower surface of the case (10) is placed on the mounting substrate and mounted on the surface, the non-horizontal caulking piece (143) is mounted. Abutting on the substrate, the mounting state becomes unstable. In order to prevent this, it is necessary to separately form legs for contacting the mounting substrate from the lower surface of the case (10), which further increases the product height.

  As another method for preventing the caulking piece from protruding from the lower surface of the case, for example, as shown in FIG. 2 of Patent Document 2, a concave caulking piece insertion recess (35) is provided on the lower surface of the case (10). There is a configuration in which the crimping piece (123) of the cover (120) is bent and inserted into the piece insertion recess (35). With this configuration, the product height does not increase and the caulking piece (123) does not protrude from the lower surface of the case (10), and when the rotary electronic component is placed on the mounting board, the mounting is performed. Does not become unstable. However, when configured in this way, the thickness of the case (10) where the caulking piece insertion recess (35) is provided becomes thin, and therefore, when the case (10) is molded, the thin resin is poorly filled with the molding resin. there is a possibility. In particular, when the circuit board is insert-molded inside the case (10) and a part of the circuit board is located at the upper part of the bottom surface of the caulking piece insertion recess (35), Since the gap between them becomes narrow, the above-mentioned problem of poor filling becomes large. On the other hand, in order to keep the thickness dimension of the molding resin between the bottom surface of the crimping piece insertion recess (35) and the circuit board at a predetermined dimension or more, the thickness of the entire case (10) is increased accordingly.

  The present invention has been made in view of the above points, and its purpose is to prevent the caulking piece of the cover folded on the lower surface of the case from projecting from the lower surface of the case, and to prevent the molding of the case from occurring. An object of the present invention is to provide an electronic component capable of reducing the height.

The present invention provides a case in which a circuit board is exposed on the bottom surface of a storage recess provided on an upper surface, a moving body that is movably stored in the storage recess, and an output signal according to the movement of the moving body. A detecting means for changing the position and a caulking piece attached to the upper surface of the case and extending downward through an outer peripheral side wall of the case is bent and locked in a caulking piece insertion recess provided on the lower surface of the case Thus, an electronic component comprising a cover fixed to the case is characterized in that the lower surface of the circuit board is exposed in a caulking piece insertion recess for locking the caulking piece.
Since the caulking piece of the cover is inserted and locked in the caulking piece insertion recess of the case, the caulking piece does not protrude from the lower surface of the case, and therefore, when this rotary electronic component is placed on the mounting board, it is attached. Does not become unstable.
And according to the present invention, since the caulking piece insertion recess is formed up to the lower surface of the circuit board, the thickness of the case can be made thinner than exposing the case itself to the bottom surface of the caulking piece insertion recess, thereby The product height of the electronic component can be lowered. The present invention is suitable for use in the case where at least a part of the caulking piece insertion recess is located on the lower side of the circuit board housed in the case for reasons such as downsizing of the case.
Further, according to the present invention, for example, when the circuit board is insert-molded in the case, the circuit board can be directly brought into contact with the mold surface forming the bottom surface of the portion to be the caulking piece insertion concave portion. Can be easily and reliably positioned. Further, since it is not necessary to provide a gap between the mold surface and the circuit board that are in direct contact with each other, there is no possibility of defective filling of the resin into the gap.

Further, according to the present invention, the side surface of the circuit board is surrounded by the outer peripheral side wall of the case, whereby the outer peripheral side wall of the case is closer to the lower surface of the exposed circuit board than the bottom surface of the caulking piece insertion recess. The lower surface of the case itself is exposed, and the bent portion of the caulking piece is in contact with the corner on the outer peripheral side wall side of the bottom surface of the caulking piece insertion recess.
Since the bent part of the caulking piece is in contact with the case itself and is not in contact with the circuit board, stress on the circuit board due to the attachment of the caulking piece can be eliminated. The accuracy can be improved.

  According to the present invention, the caulking piece of the cover bent on the lower surface of the case does not protrude from the lower surface of the case, and the molding of the case does not occur, and the product height can be further reduced.

It is the perspective view which looked at the electronic component 1-1 from the upper side. It is the perspective view which looked at the rotary electronic component 1-1 from the lower side. It is the disassembled perspective view which looked at the rotary electronic component 1-1 from the upper side. It is the disassembled perspective view which looked at the rotary electronic component 1-1 from the lower side. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is the perspective view which looked at the electronic component 1-2 from the lower side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an electronic component (hereinafter referred to as “rotary electronic component”) 1-1 according to the first embodiment of the present invention as viewed from above, and FIG. 2 is a perspective view of the rotary electronic component 1-1 as viewed from below. 3 is an exploded perspective view of the rotary electronic component 1-1 as viewed from above (however, the slider 80 described below is attached to the rotary body 60 and cannot be seen), and FIG. 4 is the rotary electronic component. FIG. 5 is a sectional view taken along line AA in FIG. 1, and FIG. 6 is a sectional view taken along line BB in FIG. As shown in these drawings, the rotary electronic component 1-1 includes a case 10 formed by insert-molding one circuit board 40 and three terminals 50 therein, and a storage recess 11 provided in the case 10. A rotating body (moving body) 60 having a rotating body main body 61 that is rotatably housed therein, a slider 80 attached to the lower surface of the rotating body main body 61, and an upper surface of the case 10 are attached. The cover 100 is provided. In the following description, “upper” refers to the direction of viewing the cover 100 from the case 10, and “lower” refers to the opposite direction.

  The case 10 is a molded product of synthetic resin and has a substantially rectangular shape, and a storage recess 11 having a dimension and shape for storing the rotating body main body 61 of the rotating body 60 is formed in the center of the upper surface thereof. The central portion of the upper surface of the insert-molded circuit board 40 is exposed on the bottom surface of the housing recess 11. The circuit board 40 is made of a hard plate (for example, a molded board). A circular rotating body shaft support hole 41 is formed at the center of the circuit board 40, and around the rotating body shaft support hole 41 on the upper surface of the circuit board 40. The two sliding contact patterns 43 and 45 are concentrically formed by screen printing or the like. One lead pattern 43 a is drawn from the outer periphery of the inner sliding contact pattern 43 toward one outer periphery of the circuit board 40, and one lead pattern 45 a, 45 b from each end of the outer sliding contact pattern 45. Is drawn toward the outer periphery of the 1. One end of a metal plate terminal 50 is brought into contact with one end of each of the lead patterns 43a, 45a, 45b, and the periphery thereof is covered and fixed by the case 10. The other end side of each terminal 50 protrudes outward from one side of the outer peripheral side wall 15 of the case 10, and a portion on the tip end side thereof is bent at a right angle toward the right downward direction.

  A circular shaft support hole 17 having the same inner diameter as that of the rotating body shaft support hole 41 is formed on the lower surface side of the circuit board 40 at the center of the case 10. Further, in the vicinity of the two corners of the upper surface 13 of the case 10, a locking portion 19 is formed that is composed of a pair of small protrusions that protrude upward.

  On the other hand, a plurality (four) of crimping piece insertion recesses 21 are formed on the lower surface 14 of the case 10. Each caulking piece insertion recess 21 is formed by forming a substantially straight belt-shaped recess from the opposite two sides of the lower surface of the case 10 (that is, from a position where the lower end side of the outer peripheral side wall 15 is cut out) inward. . A part of the lower surface 47 of the circuit board 40 is exposed on the bottom surface of each caulking piece insertion recess 21. More specifically, the outer peripheral side surface of the circuit board 40 is surrounded by the outer peripheral side wall 15 of the case 10, so that the case 10 is located on the bottom surface of the caulking piece insertion recess 21 than the exposed lower surface 47 of the circuit board 40. The lower surface 23 of the case 10 itself is exposed on the outer peripheral side wall 15 side (outside). In this case 10, the lower surface 47 of the circuit board 40 and the lower surface 23 of the case 10 itself are on the same plane (same plane).

  Further, a locking portion 25 made up of a pair of small protrusions is provided at a predetermined position on the lower surface 14 of the case 10 for positioning when the rotary electronic component 1-1 is attached to a mounting board (not shown). Further, at a predetermined position on the lower surface of the case 10, there is a connection trace portion 27 of a gate for injecting resin at the time of molding the case 10 and between the circuit board 40 and each terminal 50 projecting into the mold when the case 10 is molded. An insertion trace portion 29 of the pin to be sandwiched is formed.

  The rotating body 60 is substantially disc-shaped and has a size that can be inserted into the housing recess 11 of the case 10, and a substantially cylindrical shaft portion 63 that stands from the center of the upper surface of the rotating body main body 61. And a substantially cylindrical shaft portion 65 protruding from the center of the lower surface of the rotating body main body 61 is integrally formed. A portion in the vicinity of the base of the shaft portion 63 is formed to have a size that is pivotally supported by a shaft support portion 107 of the cover 100 described below. A portion on the lower end side of the shaft portion 65 is formed to a size that is rotatably supported by the rotating body shaft support hole 41 of the circuit board 40 and the shaft support hole 17 of the case 10. The lower surface of the rotating body main body 61 is a slider attachment surface 67, and a small protrusion-like slider attachment portion 69 is formed at a predetermined position.

  The slider 80 is configured by forming an elastic metal plate in a substantially disk shape, and has a circular insertion hole 83 in the center of a flat plate-like base portion 81 through which the shaft portion 65 of the rotating body 60 is inserted. A pair of inner sliding booklets 85 is formed around the outer periphery, and one outer sliding booklet 87 is formed around the inner booklet. A mounting portion 89 made of a small hole is formed at a position of the base 81 facing the slider mounting portion 69 of the rotating body 60.

  The cover 100 is made of a metal plate, and has a substantially rectangular cover body 101 having a dimension covering the upper surface of the case 10, and a pair of crimps that are bent downward from two opposite sides of the cover body 101. It comprises a piece 103 and one mounting part 105. A circular cylindrical shaft support portion 107 protruding upward is formed at the center of the cover main body portion 101, and these positions are opposed to the pair of locking portions 19 of the case 10 of the cover main body portion 101. A pair of locked portions 109 formed by small holes into which the locking portions 19 are inserted are formed. On both the left and right sides of the intermediate position of the crimping piece 103, there are formed recesses 103a that can be easily bent by reducing the width dimension. Further, the mounting portion 105 has a smaller width dimension at the tip side than the intermediate position.

  Next, in order to assemble the rotary electronic component 1-1, first, the slider 80 is first placed on the slider mounting surface 67 of the rotating body 60, and at that time, the slider mounting portion 69 of the rotating body 60 is set. The slider 80 is attached to the rotating body 60 by being inserted into the attachment portion 89 of the slider 80 and caulking its tip. Then, the rotating body main body 61 of the rotating body 60 to which the slider 80 is attached is inserted into the housing recess 11 of the case 10, and the shaft portion 65 of the rotating body 60 is inserted into the rotating body shaft support hole 41 of the case 10 and It is rotatably inserted into the shaft support hole 17. Next, the cover body 101 of the cover 100 is placed so as to cover the upper surface of the case 10. At that time, the shaft portion 63 of the rotating body 60 is rotatably inserted into the shaft support portion 107 of the cover 100, and each locking portion 19 of the case 10 is inserted into each locked portion 109 of the cover 100. The caulking piece 103 and the attachment portion 105 of the cover 100 are placed along the outside of the outer peripheral side wall 15 of the case 10. Then, the portion on the tip side of each crimping piece 103 at the position corresponding to each crimping piece insertion recess 21 of the case 10 (the portion on the tip side relative to the recess 103 a) is bent so as to enter into each crimping piece insertion recess 21. . As shown in FIG. 6, each bent crimping piece 103 enters the crimping piece insertion recess 21 as a whole. Thereby, the assembly of the rotary electronic component 1-1 is completed. The above assembling procedure is an example, and it goes without saying that the assembly may be performed using other various assembling procedures.

  When the rotating body 60 is rotated, the slider 80 is rotated integrally therewith, and the sliding booklets 85 and 87 are slid on the sliding contact patterns 43 and 45, respectively. The detection output between each connected terminal 50 changes.

  In the rotary electronic component 1-1, the caulking piece 103 of the cover 100 is inserted and locked in the caulking piece insertion recess 21 of the case 10 as shown in FIG. Therefore, when the rotary electronic component 1-1 is placed on another mounting board (not shown), the mounting thereof does not become unstable. The attachment portion 105 is used when the rotary electronic component 1-1 is fixed to the mounting board.

  Moreover, in this rotary electronic component 1-1, as shown in FIG. 6, the lower surface 47 of the circuit board 40 is exposed to the caulking piece insertion concave portion 21 (the bottom surface thereof). The thickness of the case 10 can be made thinner than exposing the case 10 itself to the entire bottom surface, whereby the product height of the case 10, that is, the rotary electronic component 1-1 can be reduced. In other words, the present invention is particularly suitable for use in the case where at least a part of the caulking piece insertion recess 21 is located below the circuit board 40 accommodated in the case 10 for reasons such as downsizing the case 10. is there.

  Further, in the rotary electronic component 1-1, when the circuit board 40 is insert-molded into the case 10, the lower surface 47 of the circuit board 40 is directly formed on the mold surface that forms the bottom surface of the portion that becomes the caulking piece insertion recess 21. It will abut. For this reason, the circuit board 40 can be easily and reliably positioned on the mold. Furthermore, since there is no need to provide a gap between the mold surface that forms the bottom surface of the portion to be the caulking piece insertion recess 21 and the circuit board 40 and to fill the molten resin, poor filling of the resin into the gap Will not occur.

  Furthermore, in this rotary electronic component 1-1, the outer peripheral side surface of the circuit board 40 is surrounded by the outer peripheral side wall 15 of the case 10, so that the case is smaller than the exposed lower surface 47 of the circuit board 40 on the bottom surface of the caulking piece insertion recess 21. The lower surface 23 of the synthetic resin itself constituting the case 10 is exposed on the outer peripheral side wall 15 side of the outer peripheral side wall 15, and the bent portion a of the crimping piece 103 (see FIG. 6) is thereby It is in contact with the corner b on the 15 side. In this way, if the bent portion a of the crimping piece 103 is brought into contact with the case 10 itself and is not brought into contact with the circuit board 40, stress on the circuit board 40 due to the attachment of the crimping piece 103 can be eliminated. For this reason, the accuracy of detection output by the slider 80 and the sliding contact patterns 43 and 45 is not hindered, which is preferable.

  FIG. 7 is a perspective view of an electronic component (hereinafter referred to as “rotary electronic component”) 1-2 according to the second embodiment of the present invention as viewed from below. In the rotary electronic component 1-2 shown in the figure, the same or corresponding parts as those of the rotary electronic component 1-1 according to the embodiment shown in FIGS. Subscript "-2"). Note that matters other than those described below are the same as those in the embodiment shown in FIGS. However, in the case of the rotary electronic component 1-2, since the height of the shaft portion on the upper side of the rotating body 60-2 is low, it cannot be seen in FIG.

  As shown in FIG. 7, the rotary electronic component 1-2 includes a case 10-2 in which one circuit board 40-2 and two right and left terminals 50-2 are insert-molded, and a case 10-2. 10-2, a rotating body (moving body) 60-2 that is rotatably housed in a housing recess (not shown) provided on the upper surface of 10-2, a slider (not shown) attached to the lower surface of the rotating body 60-2, and the case 10 The circuit board 40-2 is provided with a cover 100-2 attached so as to cover the upper surface of -2 and by rotating the rotating body 60-2, the slider is exposed on the bottom surface of the housing recess. The detection output is output to each terminal 50-2 by sliding on the sliding contact pattern. The cover 100-2 is a caulking piece insertion recess 21-2 in which a caulking piece 103-2 extending downward through the outer peripheral side wall 15-2 of the case 10-2 is provided on the lower surface 14-2 of the case 10-2. It is fixed to the case 10-2 by being bent and locked inside.

  And in case 10-2 of this rotary electronic component 1-2, the lower surface of circuit board 40-2 is exposed to the whole bottom face of caulking piece insertion recessed part 21-2. In other words, the outer peripheral side surface of the circuit board 40-2 is exposed to the outer peripheral side wall 15-2 of the case 10-2, thereby exposing the lower surface of the circuit board 40-2 to the entire bottom surface of the caulking piece insertion recess 21-2. ing. In the case 10-2, the bent portion a-2 of the crimping piece 103-2 is brought into contact with the exposed outer peripheral side surface of the circuit board 40-2. When configured in this manner, unlike the case 10, the caulking piece 103 does not have the effect of relieving stress on the circuit board 40, but instead, the caulking piece insertion recess 21-of the case 10-2 is provided. The width dimension between the opposing outer peripheral side walls 15-2 provided with 2 can be reduced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, although a hard circuit board is used as the circuit board in the above example, a flexible circuit board may be used in some cases. In the above example, an example of a rotary electronic component using a rotating body as a moving body has been described. However, the present invention can also be applied to a sliding electronic component in which the moving body slides. The slide movement direction is a concept including not only a linear direction but also various directions such as an arc direction and other curved directions. In the above example, the slider and the sliding contact pattern are used as the detection means. However, any other detection means (electrical) can be used as long as the detection means changes the output signal according to the movement of the moving body. , Magnetic, optical, etc.). In the above example, an example in which the circuit board is insert-molded in the case has been shown. However, the circuit board may not be insert-molded. For example, a structure in which the circuit board is incorporated in the molded case later may be used. In the above example, the lower surface of the circuit board exposed on the bottom surface of the caulking piece insertion recess of the case and the lower surface of the case itself are configured to be on the same plane (same plane), but both the lower surfaces are not necessarily the same plane. Also good.

  Further, the embodiments described in the above drawings can be combined with each other as long as there is no contradiction in the purpose and configuration. Moreover, the description content of each figure may become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.

1-1 Rotary electronic components (electronic components)
DESCRIPTION OF SYMBOLS 10 Case 11 Storage recessed part 14 Case lower surface 15 Outer peripheral side wall 21 Crimp piece insertion recessed part 23 Case lower surface 40 Circuit board 43 Sliding contact pattern (detection means)
45 Sliding contact pattern (detection means)
47 Lower surface of circuit board 50 Terminal 60 Rotating body (moving body)
80 Slider (detection means)
100 Cover 103 Crimp piece a Folded part b Corner

Claims (2)

A case in which the circuit board is exposed on the bottom surface of the storage recess provided on the top surface;
A movable body movably housed in the housing recess;
Detecting means for changing an output signal in accordance with movement of the moving body;
A caulking piece attached to the upper surface of the case and extending downward through the outer peripheral side wall of the case is fixed to the case by bending and locking in a caulking piece insertion recess provided on the lower surface of the case. And an electronic component comprising a cover,
An electronic component, wherein a lower surface of the circuit board is exposed in a caulking piece insertion recess for locking the caulking piece. The electronic component according to claim 1,
A side surface of the circuit board is surrounded by an outer peripheral side wall of the case,
Accordingly, the lower surface of the case itself is exposed on the outer peripheral side wall side of the case from the lower surface of the exposed circuit board on the bottom surface of the caulking piece insertion recess,
An electronic component, wherein the crimped piece is bent at a corner of the bottom surface of the caulking piece insertion recess on the outer peripheral side wall.

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