JP2006202506A - Rotary electronic component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electronic component for use as, for example, operation parts of various electronic devices that stabilizes soldered states of terminals after reflow soldering. <P>SOLUTION: A case 21 is constituted by combining a main part 31 and a contact fixing part 32 with a slight clearance between. The clearance can absorb differences in thermal expansion/shrinkage between members including a wiring board 10 caused when the terminals 43 are reflow-soldered, to deter an influence on soldered portions of the terminals 43 and stabilize the soldered states of the terminals 43. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotary electronic component used in an operation part of various electronic devices.

  In recent years, as electronic devices have become smaller and lighter, various electronic components are often mounted by reflow soldering on a wiring board disposed in the device.

  As the terminal shape of the electronic component in accordance with the reflow soldering, a so-called gull wing shape or a J bent shape is known, and a drawing of a conventional rotary electronic component having a gull wing type terminal is shown below. Will be described.

  FIG. 5 is a cross-sectional view of a conventional rotary electronic component mounted, FIG. 6 is an exploded perspective view thereof, and FIG. 7 is a diagram showing an engagement state of a rotary contact plate and an elastic fixed contact, which are the main parts.

  In the figure, reference numeral 1 denotes a case made of an insulating resin having a substantially rectangular box shape when viewed from above and having a concave portion with an upper opening. A plurality of contact bodies 2 are electrically connected to each other on the inner bottom surface of the concave portion. It is buried and fixed in an independent state.

  One end side of each contact body 2 protrudes upward in the case 1 in an inclined state and is configured as an elastic fixed contact 3. Further, the other end side of each contact body 2 is led out from the side surface portion of the case 1 to be configured as a terminal 4.

  In general, the case 1 is formed by insert-molding a linear contact body 2 with a molding resin, and thereafter, each end portion of the contact body 2 is formed into each shape of the elastic fixed contact 3 and the terminal 4. It is formed by processing. At the time of shape processing to the elastic fixed contact 3, the above-described processing formation is performed through a hole 1 </ b> A that is arranged to penetrate the bottom of the case 1, and the dustproof property in the case 1 after the processing formation is improved. Therefore, a resin plate 5 is positioned and overlapped below the bottom of the case 1.

  On the other hand, since the terminal 4 comes to be pulled out from a height position including the thickness of the plate-like body 5, it is formed in a gull wing shape.

  Reference numeral 6 denotes a rotating body made of an insulating resin having a substantially disc-shaped flange portion 6A, a circular protrusion 6B formed to project at the center of the lower surface, and a shaft portion 6C formed to project at the center of the upper surface. The circular protrusion 6B is rotatably inserted into and held in a circular holding hole 1B arranged at the bottom of the case 1 so that the flange portion 6A is accommodated in the concave portion of the case 1. Note that the holding hole 1B is also covered with the plate-like body 5 from below as in the case of the hole 1A.

  A rotating contact plate 7 formed in a predetermined pattern by punching a metal plate or the like is fixed to the lower surface of the flange portion 6 </ b> A of the rotating body 6. 7, each of the elastic fixed contacts 3 is engaged in an elastic contact state as shown in FIG. 7.

  Reference numeral 8 denotes a metal cover that covers the opening portion of the case 1, and the shape thereof is provided at a flat rectangular plate-like portion 8A that covers the opening portion of the case 1, and at the center position of the plate-like portion 8A. The central hole 8B has side plate portions 8C that are bent downward at one opposing end portion of the plate-like portion 8A. Further, at the lower end position of each side plate portion 8C, a caulking leg portion 8D and A prismatic positioning projection 8E arranged for positioning at the time of mounting is provided.

  The metal cover 8 is placed from above the case 1 so that the shaft portion 6C of the rotating body 6 is inserted into the central hole 8B, and is arranged at the lower end of each side plate portion 8C arranged along the outer surface on one side of the case 1. The caulking leg portion 8D is attached to the case 1 and the plate-like body 5 by being caulked on the lower surface side of the plate-like body 5. In the attached state, the positioning protrusion 8E protrudes below the plate-like body 5. In addition, the case 1 and the plate-like body 5 are in a coupled state without positional displacement by engaging the concave and convex portions provided on the opposing surfaces.

  Further, a click spring 9 is fixed to the lower surface of the plate-like portion 8A of the metal cover 8, and the dowel portion 9A of the click spring 9 is an upper surface portion of the flange portion 6A formed on the uneven surface of the rotating body 6. It is elastically touching. This constituent part becomes a click generation mechanism, and becomes a part that gives a sense of moderation during operation.

  The conventional rotary electronic component is configured as described above.

  Then, as shown in FIG. 8, each terminal 4 is mounted on the used device by reflow soldering and fixing on the wiring board 10 disposed in the device. At the time of mounting, reflow soldering is fixed in a state where the positioning protrusion 8E of the metal cover 8 is positioned by being inserted through a through hole (not shown) of the wiring board 10 arranged according to the mounting position. It has become so.

  When the shaft portion 6C is rotated in the state of being mounted on the device, the rotating body 6 rotates and a click feeling is obtained at a predetermined angular position by the click generation mechanism, and the rotary contact plate 7 is elastically fixed. By rotating relative to the contact 3, a predetermined electrical signal is generated, and the signal can be taken out via each terminal 4.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2002-373553 A

  In the above conventional rotary electronic component, when mounted on the wiring board 10, it is passed through a high temperature atmosphere which is a reflow soldering condition. At that time, the wiring board 10, the case 1, etc. each expand by a predetermined amount. Shrink when returning to normal temperature.

  The amount of thermal expansion / shrinkage is different for each member including the wiring board 10, and the difference affects the soldering / fixing portion of the terminal 4. Therefore, normally, in order to stabilize the soldering / fixing state, The height position of the terminal 4 end portion from the wiring board 10 must be strictly controlled, which has been a factor in raising the product unit price.

  The present invention solves such a conventional problem, and when a terminal is reflow soldered and fixed, there is an influence caused by a difference in thermal expansion and contraction of each member including a wiring board on the soldered and fixed portion. An object of the present invention is to provide a rotary electronic component having a configuration that can be reduced.

  In order to achieve the above object, the present invention has the following configuration.

  According to the first aspect of the present invention, there is provided a rotating body rotatably held in a resin case, a metal rotating contact plate fixed to the rotating body, and the one end side fixed to the case. A rotary electronic component including a contact body that is a fixed contact that engages with the rotary contact plate, the other end of which is led out of the case and formed as a surface-mount type terminal, and the case includes: The contact body fixing portion for fixing the contact body and the main portion are divided and formed in different pieces, and each of them includes the wiring board generated when reflow soldering to the wiring board of the device is performed. The rotary electronic component is characterized by being combined in a state where a minute gap that can absorb the difference in thermal expansion and contraction of the member is opened.

  This configuration is designed to absorb the difference in thermal expansion / contraction amount of the wiring board and case generated during reflow soldering through the small gap in the case, so that the influence is applied to the soldering fixing part of the terminal. , And can be difficult. For this reason, it is possible to stabilize the soldering state of the terminals, and it is possible to reduce the soldering joint area of the terminals and simplify the management when forming the terminals.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the contact body fixing portion and the main portion are arranged so that the contact body fixing portion can be combined by horizontal sliding movement from the side of the main portion. A linear guide groove is provided on either side of the guide, and a horizontal protrusion guided by the guide groove is provided on the other side. It has the effect | action that a part can be combined easily.

  The invention according to claim 3 of the present invention is the cover according to claim 2, which covers the concave portion of the case and is intended to prevent the contact body fixing part from coming off from the main part, and an additional member is added. Without having to do so, the combined state of the cases can be maintained, and an increase in the number of parts can be suppressed.

  As described above, according to the present invention, the case is divided into the main part and the contact body fixing part and combined so as to provide a minute gap, and the thermal expansion and contraction amount including the wiring board at the time of reflow soldering in the gap is provided. Since the difference between these components can be absorbed, the influence caused by the difference in thermal expansion and contraction of each member including the wiring board can be reduced, and the soldering and fixing state of the terminal after reflow soldering can be made more stable. There is an advantageous effect that a rotary electronic component that can reduce the soldering joint area and simplify the management at the time of terminal formation can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the same structure as the past, and detailed description is abbreviate | omitted.

(Embodiment)
1 is a cross-sectional view of a rotary electronic component according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a diagram showing an engagement state between a rotary contact plate and an elastic fixed contact, which are the main parts It is.

  In the figure, reference numeral 21 denotes a case made of an insulating resin having a substantially rectangular box shape when viewed from above and having a concave portion with an upper opening. The case 21 includes a main part 31 and a contact body fixing part formed separately. 32, and the concave portion is configured to have a substantially circular shape when viewed from above by connecting the concave portions on the upper surface sides of the main portion 31 and the contact body fixing portion 32. In addition, the main part 31 and the contact body fixing | fixed part 32 are formed with the same insulating resin material.

  A circular bottomed holding hole 31 </ b> A is disposed at the bottom of the hollow portion of the main portion 31 corresponding to the concave portion of the case 21. The bottomed holding hole 31 </ b> A is disposed at a position corresponding to the center position of the case 21.

  Moreover, the main part 31 is configured not to include a solder connection terminal.

  On the other hand, a contact body 41 having one end side serving as an elastic fixed contact 42 and the other end side serving as a terminal 43 is insert-molded and fixed to the contact body fixing portion 32. A plurality of the contact bodies 41 are embedded in the bottom of the contact body fixing portion 32 in an electrically independent state, and each elastic fixed contact 42 is inclined upward in the recess as in the conventional case. Each terminal 43 is led out to the outer side of the case 21.

  The circular protrusion 6B is held in the holding hole 31A with the bottom of the concave portion of the case 21, and the rotating body 6 is rotatably arranged. The flange portion 6A is housed in the recess, and the elastic contact point 42 is elastically contacted with the rotary contact plate 7 fixed to the lower surface of the flange portion 6A as shown in FIG. Is engaged.

  In addition, a metal cover 51 is disposed above the case 21, and the concave portion of the case 21 is covered with a rectangular plate-shaped portion 51 </ b> A, and a shaft portion 6 </ b> C formed to protrude from the center of the upper surface of the rotating body 6 It protrudes upward via a central hole 51B provided in the plate-like portion 51A. Further, a dowel portion 9A of the click spring 9 fixed to the lower surface of the plate-like portion 51A of the metal cover 51 is elastically contacted with the uneven surface provided on the upper surface portion of the flange portion 6A of the rotating body 6, and the click is made at that portion. A generation mechanism is configured.

  And the said metal cover 51 has the side plate part 51C bent and extended toward the downward direction in one opposing edge part position of the plate-shaped part 51A like the past, and the lower end of each side plate part 51C At the position, a caulking leg 51D and a prismatic positioning projection 51E arranged for positioning at the time of mounting are provided.

  Here, a combination state of the case 21 configured by combining the main portion 31 and the contact body fixing portion 32, which is a feature of the present invention, will be described.

  As the combination state, as shown in FIG. 2, the contact body fixing part 32 is horizontally slid from the side of the main part 31 and combined.

  A portion of the main portion 31 to which the contact body fixing portion 32 is attached has a U-shape as viewed from above, in which the opposing side wall portion 31B protrudes, and the inner wall surface of each side wall portion 31B is parallel to the bottom surface of the case 21. It has the linear guide groove 31C comprised by the relationship.

  On the other hand, the contact body fixing part 32 is formed to have a size that can be inserted into the U-shape of the main part 31 when viewed from above, and on the side surface part of the contact body fixing part 32 corresponding to the inner wall surface of the side wall part 31B. A horizontal protrusion 32A is provided which is inserted and guided into the guide groove 31C from the U-shaped opening side.

  And the main part 31 and the contact body fixing | fixed part 32 are inserted and combined by carrying out a horizontal slide movement until the opposing end surfaces in the insertion direction contact | abut along horizontal guide 32A along the guide groove 31C, the said If it is a structure, it can be easily combined with a simple structure, which is preferable.

  The main part 31 and the contact body fixing part 32 are prevented from coming off by providing the plate-like part 51A of the metal cover 51 that covers the upper surface of the concave part of the case 21 without adding dedicated parts and increasing the number of parts. The configuration is performed by the bending restricting portion 51F. That is, the bending restricting portion 51F is formed by bending the end portion of the plate-like portion 51A perpendicular to the side plate portion 51C downward.

  In the metal cover 51, after the main portion 31 and the contact body fixing portion 32 are combined by horizontal slide insertion as described above, the bending restricting portion 51F restricts the removal of the contact body fixing portion 32 from the main portion 31. It is combined with the case 21 so as to be located on the outer side. At this time, the side plate portion 51C of the metal cover 51 is arranged along each outer surface on the side wall portion 31B side of the main portion 31, and the caulking leg portion 51D at the lower end of each side plate portion 51C is the bottom surface of the main portion 31 of the case 21. The metal cover 51 is attached to the case 21 by being swaged to the side. The positioning projections 51E provided at the lower ends of the side plate portions 51C protrude downward from the case 21.

  In the crimped state, the contact body fixing part 32 is restricted by the bending restricting part 51F so that the contact body fixing part 32 and the main part 31 are not completely in close contact with each other and have a slight gap. Yes.

  In addition, as shown also in FIG. 2, it is set as the structure which made the front-end | tip of the elastic fixed contact 42 protrude from the contact body fixing | fixed part 32, and comprised the bottom part of the case 21 corresponding to the protrusion part to the main part 31 side. Then, the shape processing of the elastic fixed contact 42 is easy, and since it is not necessary to provide the conventional hole portion 1A for elastic fixed contact processing in the case 21, the plate-like body 5 is also unnecessary. If this plate-like body 5 is eliminated, the shape of the terminal 43 can be made into a J-bent shape that is easy to manage and has a high soldering strength, and the product can be made thinner.

  In addition, when setting it as the said structure, if the bottom part position of the main part 31 in which the protruding elastic fixed contact 42 is located is comprised by the step part 31D lowered | hung one step, the elastic fixed contact 42 will be in the inside of the main part 31. It is possible to make it difficult to come into contact with the bottom surface, to improve the workability of combination, and to prevent inadvertent deformation of the elastic fixed contact 42 and the like.

  Further, if each terminal 43 has a configuration derived in a parallel relationship in a direction opposite to the slide insertion direction of the contact body fixing portion 32, each member including the wiring board 10 generated during reflow soldering mounting described later is used. The influence of the thermal expansion / contraction difference mainly follows the sliding insertion direction of the contact body fixing portion 32 or the opposite direction, and the degree of relaxation increases. In this configuration, it is preferable that each elastic fixed contact 42 is elastically contacted with the rotary contact plate 7 on a line segment orthogonal to the sliding direction.

  The rotating electronic component according to the present invention is configured as described above. Next, the mounting state will be described.

  As shown in FIG. 4, the rotary electronic component is mounted by reflow soldering the terminals 43 on the wiring board 10 in the used device.

  At the time of mounting, the positioning protrusion 51E of the metal cover 51 is inserted into a through-hole (not shown) of the wiring board 10 arranged according to the mounting position in the same manner as the conventional one. And then soldered and mounted through a reflow oven.

  At this time, each of the wiring board 10 and the case 21 passed through the high-temperature atmosphere, which is a reflow soldering condition, expands by a predetermined amount and then contracts when returning to room temperature. In this configuration, the position of the contact body fixing portion 32 is regulated in the removal direction, and the main portion 31 and the contact body fixing portion 32 are combined in a state having a slight gap as one case 21. Since the main part 31 and the contact body fixing part 32 can be relatively moved with respect to the horizontal direction of the board surface, even if a difference in the thermal expansion / contraction amount including the wiring board 10 occurs, the influence is exerted. It becomes difficult to reach the soldered joint portion of the terminal 43 and stress can be relaxed. In addition, if the contact body fixing | fixed part 32 side which has arrange | positioned the terminal 43 is reduced in weight, the influence on the soldering junction part of the terminal 43 will come to be reduced.

  Then, as the operation of the rotary electronic component mounted on the wiring board 10, as in the conventional case, when the shaft portion 6C is rotated, the rotary body 6 rotates and clicks at a predetermined angular position by the click generation mechanism. A feeling can be obtained, and the rotating contact plate 7 fixed to the rotating body 6 rotates relative to each elastic fixed contact 42 to generate a predetermined electrical signal. Can be taken out through.

  As described above, in the rotary electronic component according to the present invention, the influence of the difference in thermal expansion / contraction amount in each member during reflow soldering can hardly reach the soldering fixing portion of the terminal 43. The soldering and fixing state can be made more stable than the conventional one and the stress can be relaxed. In addition, even when a difference in thermal expansion / contraction amount of each member including the wiring board 10 generated due to the usage environment occurs after mounting the device, the influence can be mitigated in the same manner, so that the soldering fixed state can be maintained over a long period of time. It will be stable.

  In the above description, the case of the terminal 43 processed into a J bent shape has been described as an example, but the idea according to the present invention can be applied to a terminal processed into a shape of other surface mounting type, depending on circumstances. In this case, the configuration can be applied to reduce the soldering joint area of the terminals and simplify the management at the time of forming the terminals.

  The rotary electronic component according to the present invention is configured to absorb the difference in thermal expansion and contraction amount including the wiring board during reflow soldering with a small gap in the case, so that the terminal soldering and fixing state after reflow soldering is more stable This is useful when, for example, configuring an operation part of various electronic devices.

Sectional drawing of the rotation type electronic component by one embodiment of this invention Exploded perspective view The figure which shows the engagement state of the rotating contact plate which is the principal part, and an elastic fixed contact Sectional view showing the mounting state on the same wiring board Cross-sectional view of a conventional rotary electronic component Exploded perspective view The figure which shows the engagement state of the rotating contact plate which is the principal part, and an elastic fixed contact Sectional view showing the mounting state on the same wiring board

Explanation of symbols

6 Rotating body 6A Flange portion 6B Circular protrusion 6C Shaft portion 7 Rotating contact plate 9 Click spring 9A Dowel portion 10 Wiring board 21 Case 31 Main portion 31A Bottomed holding hole 31B Side wall portion 31C Guide groove 31D Step portion 32 Contact body fixing portion 32A Horizontal projection 41 Contact body 42 Elastic fixed contact 43 Terminal 51 Metal cover 51A Plate-like portion 51B Central hole 51C Side plate portion 51D Caulking leg portion 51E Positioning projection 51F Bending restriction portion

Claims (3)

A rotating body rotatably held in a resin case, a metal rotating contact plate fixed to the rotating body, a fixed contact fixed to the case and having one end engaged with the rotating contact plate. A rotary electronic component having a contact body whose other end is led out of the case and formed as a surface mount type terminal, wherein the case fixes the contact body And the main part are divided into different pieces, and both of them can absorb a difference in thermal expansion and contraction of individual members including the wiring board generated during reflow soldering to the wiring board of the device. A rotating electronic component characterized in that it is configured by being combined with a space between them. A linear guide groove on one side of the contact body fixing part and the main part and a guide groove on the other side so that the contact body fixing part can be combined by horizontal slide movement from the side of the main part. The rotary electronic component according to claim 1, further comprising a horizontal protrusion guided by the step. The rotary electronic component according to claim 2, wherein a cover covering the concave portion of the case is used to prevent the contact body fixing portion from coming off from the main portion.

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