JP2010020911A - Installation structure of push-button switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a push-button switch installation structure to make an easy and simple click operation from a horizontal direction to a mounting board, and to effectively protect from deviation of installed location on the mounting board or coming off, even in case an excessive thrust or shock is added to the clicking operation. <P>SOLUTION: In the push-button switch installation structure to install a horizontal-push type push-button switch 41 on the mounting board 50, the installation fixing is made so that a rear surface 44 of the push-button switch 41 installed on a reinforcement installation board 46 may contact and be housed in the bottom face 52 of a recess 51 formed by cutting out a part of a perimeter of the mounting board 50, and that an installation face 46b of the reinforcement installation board 46 may be firmly joined to a surrounding bottom part of the recess 51. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mounting structure for a lateral push type pushbutton switch mounted on a small digital device such as a cellular phone.

  A conventional general pushbutton switch includes a base portion on which an electrode is formed, a fixed contact formed on the base portion, a movable contact disposed on the fixed contact, and a click for the movable contact. A click member is provided. Further, a lateral push type push button switch in which the operation direction of the push button switch is set to a lateral direction covers a base portion composed of a fixed contact and a movable contact, as shown in Patent Documents 1 and 2, and this base portion. The casing includes an opening on one side surface, and a click member that slides in the opening in the horizontal direction and clicks the movable contact downward. The base portion is formed by a molded product in which a flat circuit board and a lead frame are insert-molded, and a plurality of solder pad portions that are electrically connected to the fixed contact and the movable contact are provided on the back surface side. The casing is provided with an inclined guide portion inclined toward the center of the movable contact. When the click member is pushed in, the tip portion of the click member hits the inclined guide portion and guides downward. As a result, the movable contact is pushed into the fixed contact. In this way, the horizontal sliding motion of the click member is transmitted to the movable contact having spring properties via the inclined guide portion, so that the fixed contact is turned on / off.

The pushbutton switch having the above-described configuration is fixed by mounting the casing on the base portion on which the switch portion is formed or joining the casing directly on the mother board on which the base portion is mounted. In addition, since a small digital device such as a mobile phone equipped with such a push button switch is also required to be thin, a surface mounting method in which the thickness width of the mounting is suppressed is often employed. At the time of this surface mounting, the pushbutton switch is fixed to the mother board and electrically connected simultaneously by a reflow process.
JP 2006-244977 A JP 2005-209565 A

  The lateral push type pushbutton switch having the above-described configuration is configured so that the external pressure associated with the on / off operation of the switch portion acts upward of the casing. It is necessary to raise it to some extent with respect to the mounting board. In addition, such a side-push type push button switch is often used as a side operation switch for small digital devices such as mobile phones. It is easy to cause malfunction or physical destruction of the switch function due to strong impact or pressure such as hitting. In many cases, such destruction proceeds from peeling of the casing facing the sliding direction of the click member first, and then reaches the base portion where the switch portion is formed. Therefore, it is necessary to particularly increase the strength in the vicinity of the click member exposed on the side surface of the mobile phone or the like.

  In recent years, there has been a demand for downsizing and multi-functionality in a lateral push type push button switch. However, the lateral push type pushbutton switch as described above is mounted on a hard mounting board by soldering, but the switch operating direction and the solder connecting part are orthogonal to each other. This makes it difficult to reduce the size and increase the number of functions.

  In particular, when the lead frame is used, insert molding is used, so that there is a problem that the shape is complicated and the initial cost is high, such as requiring a special mold and equipment required for manufacturing. For this reason, it has been difficult to provide additional functions such as a two-step action operation and an illumination function, which are difficult to have variations in load.

  In addition, since a general lateral push type pushbutton switch mechanically converts the operation load from the lateral direction, the click feeling becomes worse due to the frictional resistance at the sliding portion and the load of the bending load at the operation arm portion. There is a case. Furthermore, since there is a distance from the operation side of the operation arm part to the movable contact point, the operation arm part is wobbled and the actual pressing point is deviated.

  Accordingly, an object of the present invention is to easily and simply perform a click operation from the horizontal direction on the mounting substrate, and to attach the mounting operation on the mounting substrate even when an excessive pressing force or impact is applied to the click operation. It is an object of the present invention to provide a push button switch mounting structure that can effectively prevent positional deviation and separation.

  In order to solve the above problems, the present invention is characterized in that, in a push button switch mounting structure in which a lateral push type push button switch is mounted on a mounting board, the push button switch is fixed to the mounting board through a reinforcing mounting board. To do.

  The pushbutton switch mounting structure is characterized in that the reinforcing mounting board is mounted on the back side of the pushbutton switch, and one side surface of the reinforcing mounting board is placed on the mounting board and fixed.

  The mounting board has a recess in an outer peripheral portion, and the push button switch is disposed in the recess via the reinforcing mounting board.

  According to the pushbutton switch mounting structure according to the present invention, a reinforcing mounting board is attached to a single pushbutton switch, and the pushbutton switch is fixed to the mounting board via the reinforcing mounting board, so that the pushbutton switch can be mounted in either the vertical direction or the horizontal direction. It is possible to adopt a configuration that can be operated from the direction of. Further, since the mounting strength is increased, the push button switch can be prevented from being displaced or detached from the mounting board even when an excessive pressing force or an impact such as dropping is applied to the operation from the lateral direction.

  According to the first mounting structure of the present invention, the reinforcing mounting board is joined to the back surface of the base portion of the push button switch, and one side surface of the reinforcing mounting board is joined to the mounting board, whereby the normal push button switch is It can be attached so as to be a lateral push type push button switch that is parallel to the mounting substrate. Further, since the reinforcing mounting substrate is formed with a through-hole-shaped substrate electrode that communicates with the base electrode formed on the base portion, the substrate electrode is directly formed on the surface of the mounting substrate. It can be conductively joined to the pattern. In addition, since the pushbutton switch is attached to the mounting board via the reinforcing mounting board, it is possible to widen the bonding area with the mounting board, and when the pressing force due to the click operation is excessively applied or dropped. Even when a shock such as the above is received, it is possible to greatly reduce the trouble that the mounting position of the push button switch is shifted or detached from the mounting board.

  According to the second mounting structure of the present invention, since the pushbutton switch is mounted in the recessed state in which the side surface of the mounting board is cut out, the click operation from the horizontal direction and the external impact are directly applied to the mounting board. It can be received directly on the side surface side, and the push button switch can be effectively prevented from being displaced or detached. Furthermore, since the pushbutton switch is housed in the recess of the mounting board, the mounting space can be greatly reduced.

  Embodiments of a push button switch mounting structure according to the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show a push button switch mounting structure according to the first embodiment of the present invention. As shown in FIGS. 2 and 3, the push button switch 21 used here includes a base portion 22 on which a base electrode 22a is formed, a fixed contact 23a formed on the base portion 22, and a fixed contact 23a. A switch part 23 comprising a movable contact 23b disposed on the movable contact 23b, a click member 25 disposed on the movable contact 23b, and a mold frame provided on the base part 22 and slidably holding the click member 25. And a casing 24.

  The base portion 22 is a rectangular flat plate made of epoxy resin, BT resin, or the like. On the surface of the base portion 22, a fixed contact 23a is provided at the center, and a base electrode 22a is formed at a corner portion by a through hole, and an electrode pattern that connects the fixed contact 23a and the base electrode 22a is formed. The base electrode 22a is set at two or more locations. The movable contact 23b is formed by a dome-shaped leaf spring with a slightly protruding central portion facing the fixed contact 23a, and is connected to the fixed contact 23a via a spacer provided on the outer peripheral portion of the base portion 22. Are arranged with a certain gap. The surface of the movable contact 23b is covered with a moisture-proof sheet member. The click member 25 protrudes from the casing 24 on the upper surface, a pressing protrusion that contacts the upper center of the movable contact 23b on the lower surface, an outer peripheral edge that is slidably held on the inner peripheral surface of the casing 24, and an upper surface. It is formed of a resin material having a pressing surface. A window portion is provided on the upper surface of the casing 24 so that the pressing surface of the click member 25 protrudes outside.

  As shown in FIGS. 1 and 2, the push button switch 21 has a reinforcing mounting substrate 26 joined to the back side of the base portion 22. The reinforcing mounting substrate 26 has substantially the same plane space as the base portion 22 and is formed with a thickness larger than that of the base portion 22 by epoxy resin, BT resin, or the like. Further, on the reinforcing mounting substrate 26, through-hole-shaped substrate electrodes 27 communicating with the base electrodes 22a formed in the base portion 22 are formed along the thickness direction. In the push button switch 21 and the reinforcing mounting board 26 in this embodiment, as shown in FIG. 3, the base electrode 22a is set at three locations, that is, the central portion and both corner portions of each lower side surface serving as a mounting surface. . The base portion 22 and the reinforcing mounting substrate 26 are joined by applying an adhesive that can be used for reflow processing.

  As shown in FIG. 2, the push button switch 21 to which the reinforcing mounting board 26 is joined is placed on one side surface of the reinforcing mounting board 26 at a predetermined position on the mounting board 20 serving as a motherboard mounted on various electronic devices. Is mounted so that the switch portion 23 is in the horizontal direction. As shown in FIG. 4, an electrode pattern 29 is formed at a predetermined location on the surface of the mounting substrate 20, and the substrate electrode 27 placed at a corresponding position of the electrode pattern 29 is soldered. Is done. As shown in FIG. 3, in the case where the base electrode 22a is formed at the three positions of the both end portions and the central portion of one side surface of the base portion 22, the three positions are arranged on the mounting substrate 20 side to which the pushbutton switch 21 is attached. An electrode pattern corresponding to the base electrode 22a is provided. Since the pushbutton switch 21 of the present embodiment is configured with an on / off switching function, a two-pole base electrode is required. However, in order to increase the bonding strength with the mounting substrate 20, any one of the base electrodes Are provided as dummy electrodes for connection. Thus, when joining a pushbutton switch to a mounting board | substrate stably, it is preferable to set a joining location also to the center part other than the both ends of the reinforcement attachment board | substrate 26. FIG. The substrate electrode and the electrode pattern are bonded to each other through the solder member 30 and reflow-processed for each push button switch 21 or for each mounting substrate 20.

  FIG. 5 shows a mounting structure of the push button switch 31 of the second embodiment to which an illumination function is added. The push button switch 31 of this embodiment is provided with a light emitting region in a portion adjacent to the click member 35, and the first switch 31 is provided on the back surface of the base portion 32 on which a fixed contact (not shown) and a base electrode 32a are formed. A reinforcing mounting board 36 similar to the push button switch 21 of the embodiment is joined. The light emitting area is formed by a light emitting element (LED) 38 mounted on one end of the base portion 32 and a light transmitting cover 39 covering the upper side of the LED 38. The translucent cover 39 is formed by fitting a transparent or translucent acrylic resin or the like into a part of the casing cut out. The LED electrode to which the LED 38 is connected is provided on one side surface of the base portion 32 in the same manner as the other base electrode 32a. The reinforcing mounting substrate 36 is formed with a through-hole-shaped substrate electrode 37 communicating with the base electrode 32a and the LED electrode. The push button switch 31 of this embodiment is mounted so that the switch portion 33 faces sideways by placing one side surface of the reinforcing mounting board 36 at a predetermined position on the mounting board 20 in the same manner as the push button switch 21 described above. It is done. An electrode pattern is formed on the surface of the mounting substrate 20, and the pushbutton switch 31 is fixed on the mounting substrate 20 by soldering the substrate electrode 27 placed at the corresponding position of the electrode pattern. Is done.

  When the pushbutton switches 21 and 31 of the first and second embodiments are attached to the mounting substrate 20, the pressing surfaces of the click members 25 and 35 are exposed to the case side surfaces of various electronic devices such as mobile phones. Fix to the end of the mounting substrate 20. As described above, the pushbutton switches 21 and 31 are held by the reinforcing mounting board 26 having a certain thickness, and are soldered to the mounting board 20 via one side surface of the reinforcing mounting board 26. 20 can sufficiently withstand the pressing force by the click members 25 and 35 set in the horizontal direction. For this reason, even when the click members 25 and 35 are strongly pressed or when a strong impact is applied from the outside due to dropping or the like, the push button switches 21 and 31 are displaced from the mounting board 20 or detached. Therefore, a stable switching operation can be maintained for a long time. Moreover, since the pushbutton switch is fixed to the switch board having a thickness, it is easy to increase the number of terminal electrodes and the wiring pattern. For this reason, it becomes easy to attach a multifunctional push button switch having a lighting function, a multistage switching function, and the like to the mounting board. Further, it is possible to realize a push button switch for side pushing by using a push button switch having a normal click member without using a push button switch exclusively for side pushing.

  Next, the pushbutton switch mounting structure in the third embodiment will be described with reference to FIGS. In this embodiment, as shown in FIG. 6A, the push button switch 41 mounted on the reinforcing mounting substrate 46 is accommodated in a recess 51 formed by cutting out a part of the outer peripheral portion of the mounting substrate 50. As shown in FIG. 6 (b), the upper surface of the reinforcing mounting substrate 46 is fixed by joining it to the lower surface around the recess 51. As shown in FIG. 7, the push button switch 41 used here has a base portion 42 on which electrodes are formed and a fixed contact 43a, a movable contact 43b, and a movable contact 43b formed on the front surface of the base portion 42. It is comprised with the switch part 43 which consists of the click member 45 pressed from a direction. The switch portion 43 is held by a frame body 43c in which the click member 45 is slidably disposed, and is further positioned and fixed to the reinforcing mounting substrate 46 by a casing 44 that surrounds the outer peripheral side surface of the base portion 42 and the frame body 43c. Is done.

  As shown in FIGS. 6 to 10, the push button switch 41 and the reinforcing mounting board 46 are fixed on the reinforcing mounting board 46 by placing the side surface of the base portion 42 on the surface of the reinforcing mounting board 46. This is done by inserting the mounting legs 44a protruding from the lower surface of the casing 44 into the mounting holes 46c and then soldering them. The reinforcing mounting substrate 46 is provided with a mounting surface 46a on which the push button switch 41 is positioned and mounted, and mounting surfaces 46b for joining the mounting substrate 50 on both sides of the mounting surface 46a. As shown in FIG. 11, terminal electrodes 47a to 47d corresponding to the electrode patterns 48a to 48d provided on the back surface side of the mounting substrate 50 are formed on the mounting surface 46b. In this embodiment, the terminal electrodes 47a and 47b are electrodes that are actually electrically connected to the electrode patterns 48a and 48b when the pushbutton switch 41 is switched. On the other hand, the terminal electrodes 47c and 47d are bonded to the dummy electrode patterns 48c and 48d formed on the mounting substrate 50 and not actually electrically connected to increase the strength of attachment to the mounting substrate 50. Is provided.

  As shown in FIG. 6, the recess 51 provided in the mounting substrate 50 is formed in a U-shaped notch so that the entire casing 44 can be accommodated with the tip of the click member 45 protruding outward. Is. When the pushbutton switch 41 fixed on the reinforcing mounting board 46 is attached to the mounting board 50, it is inserted so that the back surface 44b of the casing 44 contacts the bottom surface 52 in the recess 51 as shown in FIG. The left and right mounting surfaces 46 b of the reinforcing mounting board 46 are brought into contact with the back surface of the mounting board 50. Then, the electrode patterns formed around the back surface side of the recess 51 of the mounting substrate 50 and the terminal electrodes 47a to 47d formed on the mounting surface 46b are formed into the electrode patterns 48a to 48d of the mounting substrate 50 by the solder member 30. Join.

  In this way, the push-button switch 41 is housed and fixed in the recess 51 in which one side surface of the mounting board 50 is cut out in a state where the push-button switch 41 is fixed on the reinforcing mounting board 46 so as to face sideways. It is possible to easily configure a lateral push type push button switch integrated with the. According to this mounting structure, the pressing force applied to the pressing surface of the click member 45 can be stably received by the bottom surface 52 of the recess 51 of the mounting substrate 50. Further, since the push-button switch 41 is bonded to the mounting substrate 50 via the reinforcing mounting substrate 46 mounted sideways, the bonding area by the solder member 30 can be set wide, and the bonding strength can be further increased. Furthermore, since a plurality of electrodes can be formed on the reinforcing mounting board 46, it is possible to mount not only on / off switching but also a push button switch having a multi-stage switching function, an LED illumination function, and the like.

It is a perspective view which shows the attachment structure of the pushbutton switch of 1st Embodiment which concerns on this invention. It is sectional drawing of the attachment structure of the said pushbutton switch. It is a front view of the attachment structure of the said pushbutton switch. It is a top view of the attachment structure of the said pushbutton switch. It is a perspective view which shows the attachment structure of the pushbutton switch of 2nd Embodiment which concerns on this invention. It is a perspective view which shows the attachment structure of the pushbutton switch of 3rd Embodiment which concerns on this invention. It is sectional drawing of the attachment structure of the said pushbutton switch. It is a rear view of the pushbutton switch attached to the reinforcement attachment board | substrate. It is the bottom view which looked at the reinforcement attachment board | substrate with which the pushbutton switch is attached from the back surface side. It is a front view of the state which attached the pushbutton switch to the mounting substrate. It is a top view of the state which attached the pushbutton switch to the mounting substrate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 Mounting board 21 Pushbutton switch 22 Base part 22a Base electrode 23 Switch part 23a Fixed contact 23b Movable contact 24 Casing 25 Click member 26 Reinforcement mounting board 27 Substrate electrode 29 Electrode pattern 30 Solder member 31 Pushbutton switch 32 Base part 32a Base electrode 33 Switch Part 35 Click member 36 Reinforcement mounting board 37 Board electrode 38 LED
39 translucent cover 41 push button switch 42 base portion 43 switch portion 43a fixed contact 43b movable contact 43c frame 44 casing 44a mounting leg 44b back surface 45 click member 46 reinforcing mounting substrate 46a mounting surface 46b mounting surface 46c mounting holes 47a, 47b, 47c, 47d Terminal electrode 48a, 48b, 48c, 48d Electrode pattern 50 Mounting substrate 51 Recess 52 Bottom

Claims (8)

In the push-button switch mounting structure for mounting a lateral push-type push button switch on the mounting board,
A pushbutton switch mounting structure, wherein the pushbutton switch is fixed to the mounting substrate via a reinforcing mounting substrate. 2. The push button switch mounting structure according to claim 1, wherein the reinforcing mounting board is attached to a back side of the push button switch, and one side surface of the reinforcing mounting board is placed and fixed on the mounting board. 3. The reinforcing mounting substrate is provided with a through-hole electrode that communicates with an electrode provided on the pushbutton switch, and the through-hole electrode is bonded and fixed to an electrode provided on the mounting substrate. The pushbutton switch mounting structure described. The push-button switch mounting structure according to claim 3, wherein the through-hole electrode is provided at least at both corners of one side surface of the reinforcing mounting substrate. The push-button switch mounting structure according to claim 3, wherein the through-hole electrode is bonded to an electrode pattern formed on the mounting substrate. The mounting structure of the push button switch according to claim 1, wherein the mounting board has a concave portion on an outer peripheral portion, and the push button switch is disposed in the concave portion via the reinforcing mounting substrate. 7. The push button switch mounting structure according to claim 6, wherein a push button switch is placed on an upper surface of the reinforcing mounting substrate, and an upper surface of the reinforcing mounting substrate around the push button switch is fixed to a lower surface around the recessed portion. The push-button switch mounting structure according to claim 6 or 7, wherein the mounting board has an electrode pattern around the recess, and an electrode of the push-button switch formed on the reinforcing mounting board is connected to the electrode pattern.

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