JP2014154343A - Push switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push switch, which is used in an input operation part of various electronic apparatus, at a low cost, the push switch having a case that has a measure to prevent flux infiltration.SOLUTION: A push switch comprises: a case 41 formed by molding resin, and having a switch contact part; and a first terminal 11 and a second terminal 22 derived from the case 41. The case 41 is formed by insert-molding contact-having terminals 10, 20 including intermediate parts 13, 24, etc. Among pin trails recessed toward the intermediate parts 13, 24 of the bottom of the case 41, a pin trace located near the corresponding terminal 11, 22 is a hollow pin trace 50 interposed by molding resin covering the intermediate parts 13, 24 at the position of a leading end.

Description

  The present invention relates to a push switch used in an input operation unit of various electronic devices.

  In recent years, various electronic devices have been reduced in size and thickness, and there has been a growing demand for downsizing and thickness reduction of push switches used in the input operation unit.

  Such a conventional push switch will be described with reference to FIGS.

  5 is a cross-sectional view of a conventional push switch, FIG. 6 is an exploded perspective view thereof, FIG. 7 is a bottom view thereof, FIG. 8 is a cross-sectional view of only the case along the line P-P in FIG. It is sectional drawing of only the case in -Q line.

  In the figure, reference numeral 1 denotes a case formed of an insulating resin in a substantially rectangular shape when viewed from above with a concave portion in the upper opening. The case 1 has two metal plate contacts formed in a predetermined shape. Terminals 10 and 20 are formed by insert molding.

  As shown in FIGS. 7 and 8, one terminal 10 with a contact includes a first terminal 11 at both ends, an intermediate portion 13 that connects the first terminals 11 in a straight line, and an intermediate portion 13. And a linear intermediate portion 15 extending from the central position toward the other terminal 20 with contact, and the central contact 2 is provided at the tip of the intermediate portion 15.

  As shown in FIGS. 7 and 9, the other contact-equipped terminal 20 includes a second terminal 22 at both ends, an intermediate portion 24 that linearly connects the second terminals 22, and an intermediate portion 24. Two intermediate portions 26 extended from the middle position toward the one terminal with contact 10 on the one side so as to be substantially C-shaped when viewed from above. 3 is provided.

  In the terminals 10 and 20 with contacts, the intermediate part 13 connecting the first terminals 11 and the intermediate part 24 connecting the second terminals 22 are in a parallel relationship, and the terminals 10 with the contacts 10 The linear intermediate portion 15 is disposed so as to be positioned in a C shape by the intermediate portion 26 of the terminal 20 with a contact, and is insert-molded in the case 1. The first terminal 11 protrudes outward one by one from the side surfaces 1A, 1B facing each other of the case 1, and the second terminal 22 protrudes outward one by one from the side surfaces 1A, 1B. The center contact 2 and the outer contact 3 are exposed on the inner bottom surface of the recess of the case 1.

  Reference numeral 5 denotes a movable contact made of an elastic metal thin plate formed in an upward convex dome shape, and the lower end of the outer periphery is placed on the outer contact 3 and is arranged in the recess. A flexible protective sheet 7 is attached to the upper surface of the case 1, and the concave portion is covered with the protective sheet 7.

  The conventional push switch is configured as described above, and as its operation, a pressing force is applied to the movable contact 5 from above the protective sheet 7, and when the force exceeds a predetermined magnitude, the movable contact 5 Is elastically reversed with a sense of moderation, and the lower surface of the movable contact 5 comes into contact with the center contact 2. As a result, the central contact 2 and the outer contact 3 are brought into a conducting state via the movable contact 5, and a switch-on state is established in which the terminals 11 and 22 are conducted.

  When the pressing force is removed, the movable contact 5 self-restores to its original upward convex shape by its own restoring force, and the central contact 2 and the outer contact 3 shown in FIG. It was to return to the original switch-off state.

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

JP 2011-60627 A

  A conventional push switch has a case 1 formed by insert-molding two terminals 10 and 20 with contacts. The case 1 is formed by positioning the two terminals 10 and 20 with contacts between the upper and lower molds, closing the mold, and then in a cavity configured to match the shape of the case 1 to be formed. It was formed by pouring molten resin. During the insert molding, the exposed portion of the upper surface side of the terminals 10 and 20 with contacts in the recess is pressed with the upper mold of the mold, and the terminals 10 and 20 with contacts are pressed with the pressing pins provided on the lower mold of the mold. The lower surface side of the corresponding intermediate portion is supported from below and molded by injecting a molten resin, and then the pressing pin is removed from the bottom of the case 1 after the resin has been brought to a predetermined temperature. It was.

  When the case 1 is formed as described above, the portion supported by the holding pin at the bottom of the case 1 remains as a pin mark, but the bottom surface portion of the terminals 10 and 20 with contacts is exposed as the pin mark. Pin hole 30 (see FIGS. 5 and 7 to 9), and as the product was downsized, the pin hole 30 itself was made smaller, but the pin hole 30 and each terminal 11, 22 This is disadvantageous in terms of prevention of flux intrusion from the pin hole 30 adjacent to the terminals 11 and 22.

  On the other hand, it was possible to insert-mold while pressing the pressing pin back with resin pressure to form a case without the pin hole 30, but this method complicates the mold structure, which increases the cost. There was a problem of becoming.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a push switch having a case in which countermeasures against flux intrusion are achieved at a low cost.

  In order to achieve the above object, the present invention provides a push switch having a case made of molded resin, a switch contact portion, and a terminal derived from the case, the contact of the switch contact portion, the terminal, Are connected by an intermediate portion, and the case has a pin trace recessed toward the intermediate portion at a position corresponding to the intermediate portion, and the intermediate portion is located at a tip position of the depressed pin trace. It is a push switch characterized by having a configuration in which a molding resin for covering is interposed.

  If this is the case, since the resin pin that covers the corresponding intermediate portion is interposed at the tip position of the recessed pin mark, flux penetration from the pin mark into the case is prevented, in other words It has an effect that it can be made to have a case in which countermeasures against flux penetration are achieved. The case can also be configured using a mold having a holding pin with a length where the tip is located at a slight distance from the intermediate portion with the mold closed. It also has the effect that it can be reduced.

  According to the present invention, it is possible to obtain an advantageous effect that a push switch having a case in which countermeasures against flux penetration are provided can be provided at a low cost.

Sectional drawing of the push switch by embodiment of this invention Bottom view Sectional drawing of only the case in the RR line of FIG. Sectional drawing of only the case in the SS line | wire of FIG. Cross section of a conventional push switch Exploded perspective view Bottom view Sectional drawing of only the case in the PP line of FIG. Sectional drawing of only the case in the QQ line of FIG.

  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 structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.

(Embodiment)
1 is a cross-sectional view of a push switch according to an embodiment of the present invention, FIG. 2 is a bottom view of the push switch, FIG. 3 is a cross-sectional view of only a case along line RR in FIG. It is sectional drawing of only a case.

  In the figure, reference numeral 41 denotes a case formed of an insulating resin in a substantially rectangular shape when viewed from above with a concave portion in the upper opening. The case 41 is formed by insert-molding the same two metal plate-equipped terminals 10 and 20 as in the conventional case. In addition, since the arrangement | positioning relationship in the case 41 of the terminals 10 and 20 with a contact is the same as the past, detailed description is abbreviate | omitted. The first terminal 11 protrudes outward one by one from each of the side surfaces 41A and 41B of the case 41 facing each other, and the second terminal 22 protrudes outward one by one from the side surfaces 41A and 41B. The center contact 2 and the outer contact 3 are exposed on the inner bottom surface of the recess of the case 41.

  In the recess of the case 41, the movable contact 5 is disposed as in the conventional case, and the lower end of the outer periphery is placed on the outer contact 3. A flexible protective sheet 7 is attached to the upper surface of the case 41, and the concave portion is covered with the protective sheet 7.

  As described above, the push switch according to this embodiment is configured. Since the operation is the same as the conventional one, the description is omitted.

  Here, the push switch according to this embodiment is characterized by the bottom side of the case 41.

  In other words, it is the same as before that there is a pin mark of the holding pin used at the time of insert molding at the bottom of the case 41. However, as the pin mark, the corresponding lower surface portion in the intermediate portion of the terminals 10 and 20 with contacts is exposed. A pin hole 30 that is the same as the conventional one, and a hole pin mark 50 that is depressed toward the intermediate portion side of the terminals 10 and 20 with contacts and that has a hole pin mark 50 in which a molding resin that covers the intermediate portion is interposed at the tip position. It has become.

  As shown in FIGS. 2 to 4, the hole-shaped pin mark 50 is located immediately below the intermediate portion 13 that linearly connects the first terminals 11 to the respective terminals 11 side, and the second terminals 22. It is formed at a position close to each terminal 22 side just below the intermediate portion 24 that connects them in a straight line.

  On the other hand, the pin hole 30 which is the same as the conventional one is formed at a position near the center of the case 41, in other words, at a position away from the terminals 11 and 22 by a predetermined distance. For example, a position directly below the center of the intermediate portion 13 connecting the first terminals 11 or a position immediately below the periphery of the central contact 2 provided in the intermediate portion 15 extending toward the terminal 20 with the contact on the other side. Also, a position directly below the center of the intermediate portion 24 connecting the second terminals 22 or a position directly below the outer contact 3 provided in the intermediate portion 26 extending toward the terminal 10 with the contact on one side. Is formed.

  Then, the case 41 is melted in a cavity configured in accordance with the shape of the case 41 to be formed, after the two contacts 10 and 20 with contacts are positioned between the upper and lower molds and the mold is closed. In the state where the molded resin is injected, or in the state where the mold is closed, the upper mold side presses the exposed portion on the upper surface side in the concave portions of the terminals 10 and 20 with contacts. Is the same as before.

  However, as a metal mold used at the time of insert molding, a pressing pin provided on the lower mold is different from the conventional one. That is, in order to obtain the case 41 by a vertically divided mold having a simple structure, the lower mold is in contact with the lower surface side of the corresponding intermediate portion of the terminals with contacts 10 and 20 with the mold closed. The same position as that of the conventional first pressing pin set to a length that directly supports the lower surface portion from below and the lower surface portion of the corresponding intermediate portion of the terminals 10 and 20 with contacts with the mold closed. And a second pressing pin set to a length at which the tip is positioned.

  The predetermined distance on the second pressing pin side described above is a melted state between the tip of the second pressing pin and the lower surface portion of the corresponding intermediate portion of the terminals with contacts 10 and 20 with the mold closed. The lower part of the intermediate part is pressed toward the upper mold by the resin pressure and the pressure is pressed toward the upper mold, and the dimension is set such that the lower part of the intermediate part corresponding to the second pressing pin is covered with the molding resin after cooling. . In the lower mold, the first pressing pin is installed at a position near the center of the case 41, and only the second pressing pin is installed at a location near each terminal 11, 22 of the case 41.

  By forming the case 41 using the above-described simple upper and lower molds having the lower mold, the pin mark by the second pressing pin installed at a location close to the terminals 11 and 22 is the intermediate portion 13, It is easily formed as having a hole-like pin mark 50 that is depressed toward the lower surface side of 24, and that has a molded resin covering the lower surface portion of the corresponding intermediate portion 13, 24 at the depressed tip position. can do. Thus, the case 41 is formed as having only the hole pin mark 50 at a location near the lead-out position of the first terminal 11 and the second terminal 22.

  In addition, as pin traces at positions close to the respective terminals 11 and 22, the hole pin trace 50 is more advantageous than the pin hole 30 from the viewpoint of preventing flux intrusion. For this reason, it is preferable that only the hole pin mark 50 is arranged at a position close to each terminal 11, 22 of the case 41, but the position setting and ratio of the pin hole 30 and the hole pin mark 50 are as follows. You may set suitably as needed.

  In the lower mold, it is important that the first pressing pin and the second pressing pin are mixed. That is, if all the second pressing pins are used, there may be wobbling or the like at the height position of the corresponding intermediate portion of the terminals with contacts 10 and 20 at the time of insert molding.

  Then, it is easy to remodel the upper and lower split molds used in the conventional product so that the first pressing pin and the second pressing pin are mixed, thereby reducing the cost of the mold.

  As described above, if the push switch has the case 41 having only the hole pin mark 50 in the vicinity of the terminals 11 and 22, it can be provided at low cost as a countermeasure against flux intrusion. .

  The terminals with contacts 10 and 20 are not limited to the shapes described above, and are not formed with contacts, formed with no terminals, or without both. May be. Further, the switch contact portion composed of the contacts 2 and 3 and the movable contact 5 is not limited to the one described above. In addition, the structure etc. to which the drive member for operating a switch contact part was added may be sufficient. Furthermore, the shape and the number of the terminals 11 and 22 may be set as appropriate, and the lead-out positions are not limited. For example, the terminal may be derived from the middle height position of the case in addition to deriving the terminal in accordance with the bottom position of the case.

  The idea according to the present invention may be applied to cases such as a rotary variable resistor with a push switch and an encoder in addition to the push switch having the above-described configuration.

  The push switch according to the present invention can be provided at a low cost as having a case in which measures against flux intrusion are taken, and is mainly useful for an input operation unit of an electronic device.

2 Central contact 3 Outer contact 5 Movable contact 7 Protective sheet 10, 20 Terminal with contact 11 First terminal 13, 15, 24, 26 Intermediate portion 22 Second terminal 30 Pin hole 41 Case 41A, 41B Side surface 50 Hole pin mark

Claims (1)

A push switch having a case made of molded resin, a switch contact portion, and a terminal derived from the case,
The contact point of the switch contact part and the terminal are connected by an intermediate part,
The case has a structure in which a pin trace depressed toward the intermediate section side is provided at a position corresponding to the intermediate section, and a molding resin covering the intermediate section is interposed at a tip position of the depressed pin trace. Push switch characterized by.

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