JP4286185B2 - Push button switch - Google Patents

Description

  The present invention relates to a push button switch, and more particularly to a structure of a side push operation type push button switch used for surface mounting on a circuit board.

  As a structure of a conventional push-button switch of a side push operation type used for surface mounting, a synthetic resin housing and a metal mounting frame are integrally mounted by fitting concave and convex engaging portions. And soldering the flat mounting surface provided on the lower end side of the mounting frame onto the same plane of the circuit board together with the external terminals projecting to the bottom surface side of the housing and having the flat mounting surface The structure of fixing is known (for example, refer patent document 1).

Hereinafter, the structure of a conventional pushbutton switch will be described with reference to the drawings.
FIG. 6 is a front view of a conventional push button switch, and FIG. 7 is a side view of the conventional push button switch.

  In the figure, the housing 31 is formed of an insulating material such as a synthetic resin, and has a bottomed shape with a side surface opened and formed in a box shape. The housing 31 is provided with an external terminal 32 a made of a conductive metal material so as to protrude outward from the housing 31. Further, the external terminal 32 a protruding outward from the housing 31 is bent laterally at the bottom surface of the housing 31, and an attachment surface 32 c is formed so as to be flush with the bottom surface of the housing 31.

  Engaging protrusions 31 b that engage with the engaging holes 36 d of the mounting frame 36 are formed on opposite side wall portions of the housing 31. The engaging protrusion 31b is formed with a first straight portion 31c and a first inclined surface 31d, and the engaging protrusion 31b having the first straight portion 31c and the first inclined surface 31d. However, by engaging with the engaging hole 36d of the mounting frame 36, the mounting surface 32c of the external terminal 32a and the mounting surface 36c of the mounting frame 36 can be made flush with each other.

  The operation member 35 is formed in a substantially rectangular shape with an insulating material such as synthetic resin, and an operation portion 35a operated by a human finger or the like is provided on the upper surface side thereof. Further, a flange portion is formed on the peripheral surface portion of the operation member 35, and the operation member 35 is prevented from jumping out of the housing 31 by the abutment portion coming into contact with the mounting frame 36 when the operation member 35 is returned to the movement. is doing.

  The mounting frame 36 is formed in a substantially U shape with a flat metal plate, and an insertion hole 36 a through which the operation portion 35 a of the operation member 35 is inserted is provided in the center of the mounting frame 36. Further, an attachment surface 36c is formed at the lower end of the pair of side plates 36b facing the attachment frame 36 so as to be bent horizontally to be flush with the bottom surface of the housing 31. By providing it, it is possible to mount the pushbutton switch on the circuit board.

  In addition, an engagement hole 36 d that engages with the engagement protrusion 31 b of the housing 31 is formed in the pair of side plates 36 b facing the attachment frame 36. In the engagement hole 36d, a second straight portion 36e parallel to the mounting surface 36c of the side plate 36b and a second inclined surface 36f are formed. The engagement hole 36d having the second straight portion 36e and the second inclined surface 36f is engaged with the engagement protrusion 31b having the first straight portion 31c and the first inclined surface 31d of the housing 31. Thus, the mounting surface 32c of the external terminal 32a and the mounting surface 36c of the mounting frame 36 can be made flush with each other.

JP 2002-93272 A

  However, in the structure of the conventional pushbutton switch described above, the metal frame and the synthetic resin housing are integrally attached by fitting the concave and convex engaging portions, and the mounting strength of the switch is It was ensured by the shape of the fitting part. However, the miniaturization of the switch has progressed, and the shape of the fitting portion cannot be formed greatly, and it has been difficult to ensure the mounting strength of the switch.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a pushbutton switch that can secure the mounting strength of the switch by ensuring the fitting between the frame and the housing.

In order to solve the above-mentioned problems, in the present invention, as a first solving means, a housing having a storage portion in which a fixed contact is disposed on a surface orthogonal to the bottom surface, and a lead-out from the fixed contact to the bottom surface side of the housing. A projecting external terminal; a movable contact contacting and separating from the fixed contact; an operating member projecting from the housing so as to be able to press the movable contact; and retaining the operating member in the housing And a frame attached so as to cover the front and side surfaces of the housing, and extending the side plates facing the frame to the back side of the housing and bending them to bring the free ends close to each other in disposed, and the bottom-side ends of the free end is configured to have a surface mountable formed to the circuit board with said external terminals.

Further, as a second solution, the free end of the frame extending on the back side of the housing is arranged so that the surfaces overlap each other via a minute gap.
Further, as a third solution, a bent piece that can be bent inward is provided on the side plate of the frame, the bent piece is bent toward the side surface of the housing, and the free end is connected to the rear side of the housing. The frame and the housing are integrated by bending them.
As a fourth solution, the frame is integrated by winding around the front and both side surfaces of the housing and the entire outer peripheral surface of the back surface.

  As described above, the pushbutton switch of the present invention includes a housing having a housing portion in which a fixed contact is disposed on a surface orthogonal to the bottom surface, an external terminal that is led out from the fixed contact and protrudes to the bottom surface side of the housing, A movable contact that comes in contact with and separates from the contact, an operation member that protrudes from the housing so as to be able to press the movable contact, and holds the operation member in the housing to prevent it from coming off, and is attached to cover the front and side surfaces of the housing. The side plates facing the frame are extended to the back side of the housing and bent so that the free ends are arranged close to each other, and the bottom side ends of the free ends are externally attached. Since it is formed so that it can be surface-mounted on the circuit board together with the terminals, the bottom-side ends of the free ends of the frames arranged in close proximity to the circuit board together with the external terminals Since put to be fixed, it is possible to increase the mounting strength of the switch without increasing the external dimensions of the switch.

In addition, since the free ends of the frame extending on the back side of the housing are arranged so that the surfaces overlap each other via a minute gap, the bottom side of the frame where the free ends are soldered Since the end portions overlap with each other through a minute gap, the flux and the solder penetrate into the joint due to the capillary phenomenon, so that the soldering of both can be performed reliably.
In addition, the side plate of the frame is provided with a bent piece that can be bent inward, the bent piece is bent to the side surface of the housing, and the free ends are bent to the rear side of the housing, thereby integrating the frame and the housing. Therefore, by providing the frame with a bent piece that engages with the housing, the frame and the housing can be securely attached, and the bent piece does not protrude outward from the frame, so that the switch can be downsized. .
In addition, since the frame is wound and integrated over the front and both sides of the housing and the entire outer peripheral surface of the back, the entire outer peripheral surface of the housing is held by the frame, thereby strengthening the attachment between the two. And the housing can be reliably integrated.

  Embodiments of the push button switch of the present invention are shown in FIGS. 1 is a plan view of the pushbutton switch of the present invention, FIG. 2 is a front view of the pushbutton switch of the present invention, FIG. 3 is a rear view of the pushbutton switch of the present invention, FIG. 4 is a side view of the pushbutton switch of the present invention, These are explanatory drawings which show the state which mounted the pushbutton switch of this invention on the circuit board.

  In the figure, the first housing 1 is formed of an insulating material such as a synthetic resin, and a concave storage portion 1a is provided on the front surface orthogonal to the bottom surface (mounting surface). A pair of elongated support arm portions 1b and 1b are formed at both ends of the front surface across the storage portion 1a so as to protrude in a direction perpendicular to the front surface. In addition, a pair of locking step portions 1c and 1c are provided on both sides of the side surface so as to face each other, and the locking step portions 1c and 1c are folded on a side plate 8b of the frame 8 described later. The curved piece 8g is locked.

  A fixed contact 2 made of a conductive metal plate is disposed on the inner bottom surface of the storage portion 1a. The fixed contact 2 has a center contact 2a and a pair of peripheral contacts (not shown) arranged to face each other with the center contact 2a interposed therebetween. The fixed contact 2 is integrally embedded in the first housing 1 by a method such as insert molding, and the other end side of the center contact 2a and the peripheral contact is led out from the fixed contact 2 and is connected to the first housing 1. An external terminal 3 is formed so as to protrude from the bottom surface of the external terminal 3. Further, the free end of the external terminal 3 is bent at right angles in an L shape from the bottom surface of the first housing 1 to the rear surface side, and has a terminal structure for surface mounting.

  The movable contact 4 is made of a conductive thin metal plate having a spring property, and is formed in an oval dome shape having a bulging portion that can be reversed at the center. The movable contact 4 is placed on the upper surface side of the fixed contact 2 of the first housing 1, the outer peripheral edge portions at both ends are in contact with the peripheral contact, and the central bulge top portion is opposed to the central contact 2 a. In this state, it is disposed in the storage portion 1 a of the first housing 1. In the present embodiment, two movable contacts 4 are stacked in order to cope with an operation feeling (heavy torque). (See Figure 5)

  The operation member 6 is made of an insulating material such as a synthetic resin, and has a rectangular push button portion 6a, a flange portion 6b extending around the lower edge of the push button portion 6a, and a pressing portion 6c protruding downward. have. The operation member 6 is accommodated in the first housing 1 and a second housing 7 to be described later so as to be movable in the lateral direction. When the push button portion 6a is pressed, the pressing portion 6c is moved to the movable contact 4. When the movable contact 4 is reversed by pressing the bulging portion, the center contact 2a of the fixed contact 2 is electrically connected.

  The second housing 7 is also formed of an insulating material such as synthetic resin, and is formed in a substantially square shape having a square-shaped opening 7a at the center. The push button portion 6a of the operation member 6 is inserted through the opening portion 7a. Further, a stepped portion 7b is formed on the back side of the opening 7a, and the flange portion 6b of the operation member 6 is brought into contact with the stepped portion 7b to prevent the operation member 6 from being removed. The housing 1 and the second housing 7 are movably accommodated.

  In addition, a pair of kerfs (not shown) are provided at both longitudinal ends of the second housing 7, and a long shape provided in the first housing 1 in the kerfs. The first housing 1 and the second housing 7 are integrated by inserting the pair of support arm portions 1b and 1b.

  The frame 8 is formed by bending a flat metal plate formed so as to be solderable into a substantially U shape, and is opposed to the square front plate 8a by being bent at right angles from both ends of the front plate 8a. And a pair of side plates 8b, 8b. A square through hole 8c is provided in the center of the front plate 8a, and the push button portion 6a of the operation member 6 is inserted into the through hole 8c so as to be pushed in.

  A pair of support holes 8d and 8d are formed at both ends of the front plate 8a with the through hole 8c interposed therebetween. A pair of the support arm portions 1b and 1b formed to protrude in a long shape on the front surface of the first housing 1 is inserted into and engaged with the support holes 8d and 8d. Further, both end portions on the bottom surface side of the front plate 8a are formed to project, and the pair of projecting portions serve as substrate receiving portions 8e and 8e when being mounted on the circuit board 10 on which the switch is mounted.

  In this way, a pair of the support arm portions 1b and 1b are formed at both ends of the front surface of the first housing 1, and the tips of the support arm portions 1b and 1b are formed at both ends of the front plate 8a of the frame 8. Even if the surface having the storage portion 1a of the first housing 1 is pushed from the lateral direction by the operating member 6, the first housing is engaged with the pair of support holes 8d, 8d. Since the tips of the support arm portions 1b and 1b are engaged with the frame 8, the first housing 1 and the second housing 7 can be prevented from rising.

  Further, leg portions 8f are formed at the lower ends of the pair of side plates 8b, and these leg portions 8f are inserted into positioning holes (not shown) of the circuit board 10 and positioned. . Further, a foldable folding piece 8g protruding in the vertical direction is formed behind the side plate 8b. The bent piece 8g can be bent inside the side plates 8b, 8b facing each other, and the bent piece 8g is formed on the back side of the first housing 1. The first housing 1 and the second housing 7 are integrally engaged with the frame 8 by being bent and locked to 1c and 1c.

  As described above, the side plate 8b of the frame 8 is provided with the bent piece 8g that can be bent inward, and the bent piece 8g is bent at the side of the first housing 1 so that the first housing 1 is bent. 1, the second housing 7 and the frame 8 are integrated, so that the frame 8 and the first and second housings 1 and 7 can be securely attached, and the bent piece 8 g However, the switch can be downsized because it does not protrude outward from the frame 8.

In addition, a pair of belt-shaped wound pieces 8h are formed at the rear side of the bent piece 8g of the side plate 8b so as to extend to the back side of the first housing 1 and bend. The distal end side of the wound piece 8h is formed in a substantially L shape protruding toward the bottom surface side of the first housing 1, and the free ends on the distal end side of the L shape are capillary tubes during soldering. Arranged on the back side of the first housing 1 in a state of being close to each other so that the surfaces overlap each other through a minute gap G that allows flux and solder to penetrate along the joint according to the phenomenon. Has been. The bottom surface side end portion between the free ends of the wound piece 8h is an attachment portion 8i that is surface-mounted on the circuit board 10 together with the external terminal 3.
In addition, you may form the partial protrusion for forming the micro space | gap G in the one surface where the wound piece 8h is overlaid.

  The frame 8 is integrally attached to the first and second housings 1, 7. In this case, the front plate is bent by bending the bent piece 8 g on the side surface of the first housing 1. 8a and a pair of side plates 8b integrally engage the first housing 1 and the second housing 7, and the free ends of the wound pieces 8h are arranged on the back side of the first housing 1. By being bent, the first housing 1 and the second housing 7 are completely integrated by winding over the entire outer peripheral surface of the front surface, both side surfaces, and the back surface of the second housing 7.

  FIG. 5 shows a state in which the pushbutton switch having the above-described configuration according to the present invention is mounted on the circuit board 10 by surface mounting. In this case, although not shown in the drawing, the pair of leg portions 8f, 8f provided on the both side plates 8b, 8b of the frame 8 are inserted into the mounting holes of the circuit board 10 and positioned, so that the first housing is positioned. The external terminals 3 formed by bending from the bottom surface to the back side of the frame 1 and a pair of mounting portions 8i formed by being superimposed on the free end side of the wound piece 8h of the frame 8 are soldered by the solder 11. It is fixed. The soldering part of the external terminal 3 is not shown.

  At this time, since a minute gap is provided between the pair of attachment portions 8i of the wound piece 8h, the flux and the solder 11 are permeated into the mating surface of the minute gap G by the capillary phenomenon. Thus, the soldering of both can be performed reliably. And after soldering, even if the pressing force by the operation member 6 is applied, the overlapping portion (attachment portion 8i) of the wound piece 8h does not open, and the frame 8 and the first and second housings 1 and 7 Thus, the push button switch can be secured with sufficient strength.

  In this case, the frame 8 and the first and second housings 1 and 7 are integrally engaged by the bent piece 8g and the wound piece 8h, and before the pushbutton switch is mounted on the circuit board 10. The mounting strength is reinforced by the bent piece 8g to ensure a certain level of mounting strength. After the push button switch is mounted on the circuit board 10, the circuit board is mounted with the mounting portion 8i of the wound piece 8h superimposed thereon. Since it is soldered to 10, a more reliable mounting strength is ensured. Further, since the attachment portion 8i of the wound piece 8h of the frame 8 is overlapped and soldered, it is not necessary to provide a pattern for soldering with the frame 8 on the back surface of the first housing 1.

  Further, since the frame 8 is wound and integrated over the front and both side surfaces of the first and second housings 1 and 7 and the entire outer peripheral surface of the back surface, the first and second housings 1 and 7 are integrated with each other. By holding the entire outer peripheral surface of the second housing 1, 7, the attachment between both is strengthened, and the frame 8 and the first and second housings 1, 7 can be reliably integrated.

  According to the above-described embodiment of the present invention, the opposite side plates 8b, 8b of the frame 8 are extended to the back side of the first housing 1 to form a pair of strip-shaped wound pieces 8h. By bending the wound piece 8h, the respective free ends are arranged on the back side of the first housing 1 in close proximity so that their surfaces overlap in the front-rear direction via a minute gap. Since the mounting portion 8i at the bottom side end portion between the free ends is formed on the circuit board 10 together with the external terminal 3 so as to be surface-mountable, the mounting portion 8i of the frame 8 disposed in a close state is provided. Since the mounting portion 8i at the bottom side end portion between the free ends can be soldered and fixed to the circuit board 10 together with the external terminal 3, the mounting strength of the switch can be increased without increasing the external dimensions of the switch. .

It is a top view which shows the pushbutton switch of this invention. It is a front view which shows the pushbutton switch of this invention. It is a rear view which shows the pushbutton switch of this invention. It is a side view which shows the pushbutton switch of this invention. It is explanatory drawing which shows the state which surface-mounted the pushbutton switch of this invention on the circuit board. It is a front view which shows the conventional pushbutton switch. It is a side view which shows the conventional pushbutton switch.

Explanation of symbols

1: First housing (housing)
DESCRIPTION OF SYMBOLS 1a: Storage part 1b: Supporting arm part 1c: Locking step part 2: Fixed contact 2a: Center contact 3: External terminal 4: Movable contact 6: Operation member 6a: Push button part 6b: Gutter part 6c: Press part 7: First 2 housing (housing)
7a: Opening portion 7b: Stepped portion 8: Frame 8a: Front plate 8b: Side plate 8c: Through hole 8d: Support hole 8e: Substrate receiving portion 8f: Leg portion 8g: Bending piece 8h: Winding piece 8i: Mounting portion 10: Circuit board 11: Solder

Claims (4)

A housing having a storage portion in which a fixed contact is disposed on a surface orthogonal to the bottom surface; an external terminal that is led out from the fixed contact and protrudes toward the bottom surface of the housing; and a movable contact that contacts and separates from the fixed contact; An operation member that protrudes from the housing and is provided so as to be able to press the movable contact, and a frame that holds the operation member in the housing to prevent it from coming off and is attached to cover the front and side surfaces of the housing. comprising, by bending and extending the side plate opposite of the frame on the back side of said housing, each of the free ends to each other and arranged in a close state, the outer bottom surface side end portions of the free end A push button switch formed to be surface-mountable on a circuit board together with a terminal.   2. The pushbutton switch according to claim 1, wherein the free end of the frame extending on the back side of the housing is disposed so that the surfaces of the frame overlap each other through a minute gap.   The side plate of the frame is provided with a bent piece that can be bent inward, the bent piece is bent toward the side of the housing, and the free end is bent toward the back side of the housing, whereby the frame and the 3. The push button switch according to claim 1, wherein the housing is integrated.   4. The pushbutton switch according to claim 3, wherein the frame is integrated by being wound around the front surface and both side surfaces of the housing and the entire outer peripheral surface of the back surface.

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