JP2010205682A - Grease inflow preventing structure in printed circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an inflow of grease to a zone of a fixed contact of a push switch. <P>SOLUTION: In a grease inflow preventing structure in a printed circuit board 10 wherein a fixed contact 20 of a slide switch and the fixed contact 30 of the push switch are arranged on the same surface of the printed circuit board 10 and grease is applied to a grease application zone G including the fixed contact 20 of the slide switch, a partition hole 13 for partitioning a zone of the fixed contact 20 of the slide switch and a zone of the fixed contact 30 of the push switch is arranged on the printed circuit board 10, a rib 45 arranged at a position of a rubber containing sheet 40 mounted on the printed circuit board 10 corresponding to the partition hole 13 is insertion-fitted into the partition hole 13, and thus, a movement of grease from the grease application zone G to the fixed contact 30 of the push switch can be prevented with the rib 45 and the partition hole 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lubricant inflow prevention structure in a printed circuit board in which a fixed contact of a slide switch and a fixed contact of a push switch are provided on the same surface.

  Some switch devices having both a slide switch and a push switch have a fixed contact of the slide switch and a fixed contact of the push switch set on the same surface of a common printed circuit board.

  FIG. 7A is a printed circuit board of a switch device according to a conventional example having both a slide switch and a push switch, in which the fixed contact of the slide switch and the fixed contact of the push switch are provided on the same surface. It is the elements on larger scale of a board | substrate, (b) is the step surface drawing which cut | disconnected the printed circuit board of (a) by the surface X. FIG.

As shown in FIG. 7A, in the printed circuit board 100, the fixed contact 111 of the slide switch and the fixed contact 121 of the push switch are provided on the same surface.
In the conventional switch device having the printed circuit board 100, the slide contact 110 of the slide switch is slid in the direction indicated by the arrow A, and the contact portions 110a to 110c of the slide contact 110 and the fixed contact portion 111a of the fixed contact 111 are displayed. The slide switch is turned on / off by contacting and separating .about.111c.
Further, as shown in FIG. 7B, the touch contact 120 of the push switch is moved in the orthogonal direction of the printed circuit board 100 indicated by the arrow B, so that the touch contact 120 and the fixed contact 121 are contacted and separated. The push switch is turned on / off.

As shown in FIG. 7A, the surface 100a of the printed circuit board 100 is provided with a grease application region G including the region of the fixed contact 111 of the slide switch. The grease application region G includes a slide contact point. Grease is applied to prevent 110 wear and oxidation.
Here, since the fixed contact 111 of the slide switch and the fixed contact 121 of the push switch are set on the same surface of the printed circuit board 100, the grease application region G is caused by, for example, the slide of the slide contact 110 or the inclination of the printed circuit board 100. When the grease applied to the substrate moves between the printed circuit board 100 and the rubber contact sheet 130 in the direction indicated by the arrow F in the drawing, the fixed contact 121 of the push switch may be covered with the moved grease.

Since the contact portions 110a to 110c of the slide contact 110 slide on the printed circuit board 100 while pushing away the grease, the contact portions 110a to 110c of the slide contact 110 and the fixed contact 111 even if grease is attached to the fixed contact 111. The connection with the fixed contact portions 111a to 111c is not hindered.
However, as shown in FIG. 7B, the touch contact 120 is movable only in the orthogonal direction of the printed circuit board 100. When the fixed contact 121 is covered with grease, the touch contact 120 is Since the grease cannot be pushed out to contact the fixed contact 121, conduction between the touch contact 120 and the fixed contact 121 is hindered by the grease, and the reliability of the switch may be lowered.

  In the printed circuit board in which the fixed contact of the slide switch and the fixed contact of the push switch are provided on the same surface, the grease applied to the fixed contact region of the slide switch flows into the fixed contact region of the push switch. The purpose is not to.

  The present invention is a printed circuit board of a switch device having a slide switch and a push switch, wherein the fixed contact of the slide switch and the fixed contact of the push switch are provided on the same surface of the printed circuit board, and the fixed contact of the slide switch is predetermined. Lubricant inflow prevention structure in printed circuit board with lubricant applied to region, partition hole for capturing lubricant by partitioning slide switch fixed contact region and push switch fixed contact region on printed circuit board It was set as the structure which provided.

  According to the present invention, even if the lubricant (grease) applied to the fixed contact region of the slide switch moves toward the fixed contact region of the push switch, the fixed contact region of the slide switch and the push switch are fixed. Since the lubricant is captured in the partition hole that divides the contact area, the lubricant is prevented from flowing into the fixed contact area of the push switch.

It is a figure explaining the grease inflow prevention structure of the printed circuit board concerning an embodiment. It is a perspective view which expands and shows the principal part of FIG. It is a top view of the printed circuit board of FIG. FIG. 3 is a cross-sectional view of the printed circuit board of FIG. It is a top view of the printed circuit board which mounted the rubber composition sheet. It is the perspective view which looked at the rubber composition sheet from the printed circuit board side. It is a figure explaining the printed circuit board which concerns on a prior art example.

  Hereinafter, the lubricant (grease) inflow prevention structure in the printed circuit board according to the present invention is a printed circuit board of a switch device including a slide switch and a push switch, and the fixed contact of the slide switch and the fixed contact of the push switch are the same. A case where the present invention is applied to a printed circuit board set on a surface will be described as an example.

As shown in FIG. 1, a fixed contact 20 of a slide switch and a fixed contact 30 of a push switch are provided on the same surface of the printed circuit board 10.
The fixed contacts 20 and 30 are provided two by two on the printed circuit board 10 and are provided symmetrically with the lamp 14 in between.
Further, the printed board 10 is provided with a partition hole 13 that divides the area of the fixed contact 20 of the slide switch and the area of the fixed contact 30 of the push switch through the printed board 10 in the thickness direction.

As shown in FIG. 2, rectangular fixed contact portions 20a to 20c with which the contact portions 25a to 25c of the slide contact 25 abut are provided in the region of the fixed contact 20 of the slide switch.
The fixed contact portions 20a to 20c are provided with different lengths and arranged in parallel to each other, and gold plating is applied to a region of the fixed contact portions 20a to 20c exposed on the upper surface of the printed circuit board 10. ing.

The slide contact 25 constitutes a slide switch together with the fixed contact 20, and can be moved forward and backward in the direction indicated by the arrow A in the figure in conjunction with the operation of a slide knob (not shown).
The slide contact 25 is arranged in a state in which the contact portions 25a to 25c on the front end side are in contact with the upper surface of the printed circuit board 10, and the contact portions 25a to 25c and the fixed contact portions 20a to 20a are interlocked with the operation of the slide knob. The slide switch is turned on / off by being brought into contact with or separated from 20c.

  As shown in FIG. 3, a region surrounded by a dotted line with a symbol G in the drawing is a grease application region G to which grease for preventing wear and oxidation of the slide contact 25 made of a copper alloy is applied. The grease application region G is set so that the fixed contact 20 of the slide switch and the sliding range of the contact portions 25a to 25c of the slide contact 25 are included therein.

  In the area of the fixed contact 30 of the push switch, two fixed contact portions 30a and 30b that are closed by a touch contact 32 (see FIG. 4) are provided. Of the fixed contact portions 30a and 30b, the printed circuit board 10 is provided. The area exposed on the upper surface is gold-plated.

As shown in FIG. 4, the touch contact 32 is disposed above the fixed contact 30 by a rubber contact sheet (sheet member) 40 to be described later, and is in a direction indicated by an arrow B in the figure (a direction orthogonal to the printed circuit board 10). It is possible to move forward and backward along.
The touch contact 32 constitutes a push switch together with the fixed contact 30. The touch contact 32 and the fixed contact 30 are brought into contact with and separated from each other in conjunction with an operation of a push knob (not shown), so that the push switch is turned on / off. It is like that.

The partition hole 13 is provided on the printed circuit board 10 so as to partition the region of the fixed contact 20 and the region of the fixed contact 30 between the region of the fixed contact 20 of the slide switch and the region of the fixed contact 30 of the push switch. It has been.
The partition hole 13 is provided to prevent the grease applied to the grease application region G of the printed circuit board 10 from moving to the region of the fixed contact 30 of the push switch.

  As shown in FIG. 3, the partition hole 13 has a long hole shape that extends linearly when viewed from above, and the center a of the grease application region G that contains the fixed contact 20 of the slide switch and the push switch are fixed. The line segment X is formed along a line segment Y passing through a substantially intermediate point c between the center a and the center b in the line segment X connecting the center b of the region of the contact 30 and orthogonal to the line segment X.

The one end 13a and the other end 13b of the partition hole 13 are formed so that the line segment Y passes through the outer peripheral edge of the grease application region G and the line segments X1 and X2 are parallel to the line segment X. It is provided outside in the longitudinal direction.
Even if the grease applied to the grease application region G spreads in the longitudinal direction of the line segment Y and moves in the direction indicated by the arrow F1 in the figure (the direction of the fixed contact 30 of the push switch), the grease is separated by the partition hole 13. This is so that it can be captured.

  FIG. 5 is a top view of the printed circuit board 10 on which the rubber composition sheet 40 is placed, and FIG. 6 is a perspective view of the rubber circuit sheet 40 viewed from the printed circuit board 10 side.

  As shown in FIG. 5, the rubber composition sheet 40 includes a mounting portion 41 that covers a range from the partition hole 13 of the printed circuit board 10 to the engagement hole 15 of the printed circuit board 10 through the fixed contact 30 of the push switch, 14 is formed integrally with a connection portion 42 that connects the placement portions 41 that are positioned symmetrically with respect to 14 and the rubber component sheet 40 is made of a material that is rich in flexibility and elasticity such as rubber.

As shown in FIG. 6, an engagement protrusion 43 is provided on the surface of the rubber composition sheet 40 on the printed circuit board 10 side so as to protrude toward the printed circuit board 10 at a position corresponding to the engagement hole 15 of the printed circuit board 10. .
As shown in FIG. 1, the rubber composition sheet 40 is placed on the printed circuit board 10 with the engagement protrusions 43 inserted into the engagement holes 15 penetrating the printed circuit board 10 in the thickness direction. The rubber contact sheet 40 is fixed and positioned by the engagement hole 15.

  As shown in FIGS. 4 and 5, the mounting portion 41 is provided with a movable portion 44 that protrudes on the opposite side of the printed circuit board 10 at a position corresponding to the fixed contact 30 of the push switch. The movable portion 44 includes a cylindrical portion 44a having a touch contact 32 provided on the bottom surface, and a peripheral wall portion 44b extending from the periphery on the lower end side of the cylindrical portion 44a to the placement portion 41 side.

The peripheral wall portion 44b is formed to have an inner diameter that increases with distance from the cylindrical portion 44a, and the tip of the peripheral wall portion 44b is connected to the mounting portion 41 at a position that surrounds the region of the fixed contact 30 at a predetermined interval. .
The peripheral wall portion 44 b positions the cylindrical portion 44 a at a position spaced apart from the printed board 10 by a predetermined distance, and separates the touch contact 32 on the bottom surface from the fixed contact 30.

  The peripheral wall portion 44b is formed thin so that it can be elastically deformed. The cylindrical portion 44a of the movable portion 44 is formed in the direction orthogonal to the printed circuit board 10 indicated by an arrow B in the drawing by elastic deformation of the peripheral wall portion 44b. It can be moved forward and backward.

Therefore, for example, when a push knob (not shown) urges the cylindrical portion 44 a toward the printed circuit board 10, the peripheral wall portion 44 b bends, so that the cylindrical portion 44 a reaches the position where the touch contact 32 on the bottom surface contacts the fixed contact 30. Move to the printed circuit board 10 side.
Further, when the urging force by the push knob is removed, the cylindrical portion 44a is moved away from the printed circuit board 10 by the restoring force of the peripheral wall portion 44b, and the touch contact 32 on the bottom surface is separated from the fixed contact 30.

As shown in FIG. 6, ribs 45 are provided on the surface of the mounting portion 41 on the printed board 10 side at positions corresponding to the partition holes 13 of the printed board 10.
The rib 45 has a shape and a size that match the partition hole 13 (see FIG. 1) of the printed circuit board 10, and the protruding height of the rib 45 is substantially the same as the thickness of the printed circuit board 10. .

  As shown in FIG. 4, the rib 45 is fitted into the partition hole 13 when the rubber con sheet 40 is placed on the printed circuit board 10. Therefore, the rib 45 is provided in a straight line along the line segment Y in FIG. 3 like the partition hole 13 of the printed circuit board 10.

The rib 45 prevents the grease applied to the grease application region G (see FIG. 3) of the printed circuit board 10 from passing between the rubber composition sheet 40 and the printed circuit board 10 and adhering to the fixed contact 30. Is provided.
The rib 45 is provided in a direction in which the fixed contact 20 of the slide switch is located when viewed from the movable portion 44 of the rubber control sheet 40, and is formed integrally with the rubber control sheet 40.

As shown in FIGS. 1 and 5, the connection portion 42 of the rubber contact sheet 40 has an opening 46 through which the lamp 14 of the printed circuit board 10 is inserted and a cylindrical wall 47 that surrounds the outer periphery of the lamp 14 inserted through the opening 46 at a predetermined interval. And are provided.
The cylindrical wall 47 is provided so as to protrude from the connection portion 42 to the side opposite to the printed circuit board 10, and prevents diffusion of light emitted from the lamp 14.
Here, the lamp 14 illuminates a slide knob (not shown) of the slide switch and a push knob (not shown) of the push switch from the back side.

The effect | action of the grease inflow prevention structure in the printed circuit board concerning embodiment is demonstrated.
As shown in FIG. 4, when the grease applied to the grease application region G moves to the fixed contact 30 side of the push switch by sliding of the slide contact 25, the grease is between the printed circuit board 10 and the rubber con sheet 40. Is moved in the direction indicated by the arrow F1 in the figure.

The printed circuit board 10 is provided with a partition hole 13 that partitions the fixed contact 20 of the slide switch and the fixed contact 30 of the push switch. The rib 45 that protrudes toward the printed circuit board 10 side of the rubber contact sheet 40 is provided in the partition hole 13. Therefore, the grease that has moved in the direction indicated by the arrow F1 in the figure is prevented from moving toward the fixed contact 30 by the rib 45. The grease whose movement is prevented by the rib 45 is discharged into the partition hole 13 by the rib 45 fitted in the partition hole 13 and captured.
Thereby, since the inflow of grease to the area of the fixed contact 30 of the push switch is suitably prevented, the adhesion of the grease to the fixed contact 30 and the touch contact 32 is prevented, and the fixed contact 30 and the touch contact 32 are The conduction is not hindered by the grease.

As described above, in this embodiment, the printed circuit board 10 is a switch device having a slide switch and a push switch, and the fixed contact 20 of the slide switch and the fixed contact 30 of the push switch are provided on the same surface of the printed circuit board 10. And a grease inflow preventing structure in the printed circuit board 10 in which the grease is applied to the grease application region G including the fixed contact 20 of the slide switch. The region of the fixed contact 20 of the slide switch is included in the printed circuit board 10. A partition hole 13 is provided to partition the grease application area G and the area of the push switch fixed contact 30 and is placed on the printed circuit board 10 to print the touch contact 32 of the push switch above the fixed contact 30 of the push switch. A rubber support that supports the substrate 10 so as to be movable in an orthogonal direction. In DOO 40, the rib 45 partitioning the greasing region G and region of the fixed contact 30 of the push switch, is provided at a position corresponding to the partition hole 13, it has a configuration for fitting the rib 45 in the partition hole 13.
Thereby, even if the grease applied to the grease application region G moves on the printed circuit board 10 toward the fixed contact 30 of the push switch, the movement of the grease is blocked by the rib 45. Then, the grease whose movement is prevented by the rib 45 is discharged into the partition hole 13 through the rib 45 fitted in the partition hole 13.
Thereby, since the inflow of the grease to the area of the fixed contact 30 of the push switch is preferably prevented, the adhesion of the grease to the fixed contact 30 and the touch contact 32 of the push switch is prevented. Accordingly, since the conduction between the fixed contact 30 and the touch contact 32 is not hindered by the grease, a decrease in the reliability of the switch is prevented.

  In the above embodiment, the case where the partition hole 13 of the printed circuit board 10 and the rib 45 of the rubber contact sheet 40 prevent the grease from flowing into the area of the fixed contact 30 of the push switch has been described as an example. 13 and the rib 45 may prevent the inflow of grease.

For example, the printed circuit board 10 has a partition hole 13 that partitions the area of the fixed contact 20 of the slide switch and the area of the fixed contact 30 of the push switch, and the rubber con sheet 40 does not have the rib 45. good.
In this case, even if the grease applied to the grease application region G moves on the printed circuit board 10 toward the fixed contact 30 of the push switch, the grease is captured in the partition hole 13. Inflow of grease into the area is prevented.

Further, the rubber contact sheet 40 has a rib 45 that abuts against the printed circuit board 10 to partition the area of the fixed contact 20 of the slide switch and the area of the fixed contact 30 of the push switch. It is good also as a structure which does not have.
In this case, even if the grease applied to the grease application region G moves on the printed circuit board 10 to the fixed contact 30 side of the push switch, the movement of the grease is blocked by the rib 45, so the fixed contact 30 of the push switch. The grease is prevented from flowing into the area.
Furthermore, since it is not necessary to provide partition holes in the printed circuit board, the degree of freedom in designing wiring and the like on the printed circuit board is improved, and the strength of the printed circuit board due to the provision of holes is not reduced.

  In addition, when it is set as the structure which does not provide the partition hole 13, the protrusion height of the rib 45 is formed by 0.2-0.3 mm, and the rubber composition sheet | seat 40 is arrange | positioned in the state which pressed the rib 45 against the printed circuit board 10. It is preferable to do. In this case, since the rib 45 functions as a seal by being in close contact with the printed circuit board 10, the inflow of grease can be reliably prevented.

In the above embodiment, the partition hole 13 and the rib 45 having a shape matching the partition hole 13 connect the center a of the grease application area G and the center b of the area of the fixed contact 30 of the push switch. A case where the partition hole 13 and the rib 45 are formed in a straight line is illustrated along the line segment Y orthogonal to the line Y.
However, the positions of the partition holes 13 and the ribs 45 can be appropriately changed within a range in which the grease application region G including the fixed contact 20 of the slide switch and the region of the fixed contact 30 of the push switch can be partitioned.
Therefore, in the case of forming in a straight line, it is not necessarily provided to be orthogonal to the line segment X, and the line segment is within a range in which the inflow of grease to the area of the fixed contact 30 of the push switch can be prevented. The crossing angle with X can be set arbitrarily.

Further, the shapes of the partition holes 13 and the ribs can be appropriately changed as long as the grease can be prevented from flowing into the area of the fixed contact 30 of the push switch, and is not limited to the straight shape.
For example, you may form in the curved shape which surrounds the area | region of the fixed contact 30 of a push switch at predetermined intervals. Further, as U-shaped partition holes and ribs when viewed from the top, the grease may not be allowed to flow into the area of the fixed contact 30 of the push switch unless the grease largely encircles the partition holes and ribs.

DESCRIPTION OF SYMBOLS 10 Printed circuit board 13 Partition hole 14 Lamp 15 Engagement hole 20 Fixed contact 25 Slide contact 30 Fixed contact 32 Touch contact (movable contact)
40 Rubbercon sheet (sheet member)
41 Placement part 42 Connection part 43 Engagement projection 44 Movable part 45 Rib 47 Cylindrical wall 100 Printed circuit board 110 Slide contact 111 Fixed contact 120 Touch contact 121 Fixed contact 130 Rubber contact sheet G Grease (lubricant) application area

Claims (3)

A printed circuit board of a switch device having a slide switch and a push switch, wherein the fixed contact of the slide switch and the fixed contact of the push switch are provided on the same surface of the printed circuit board, and lubricates a predetermined region of the fixed contact of the slide switch A structure for preventing inflow of lubricant in a printed circuit board coated with an agent,
A structure for preventing inflow of lubricant in a printed circuit board, wherein the printed circuit board is provided with a partition hole that partitions the fixed contact region of the slide switch and the fixed contact region of the push switch and captures the lubricant. .   The sheet member mounted on the printed circuit board and supporting the movable contact of the push switch partitions the area of the fixed contact of the push switch and the area of the fixed contact of the slide switch, 2. The structure for preventing a lubricant from flowing into a printed circuit board according to claim 1, wherein a rib for preventing the lubricant from flowing into the region is provided, and the rib is fitted into the partition hole. A printed circuit board of a switch device having a slide switch and a push switch, wherein the fixed contact of the slide switch and the fixed contact of the push switch are provided on the same surface of the printed circuit board, and lubricates a predetermined region of the fixed contact of the slide switch A structure for preventing inflow of lubricant in a printed circuit board coated with an agent,
A sheet member placed on the printed circuit board and supporting the movable contact of the push switch is in contact with the printed circuit board to partition the fixed contact area of the push switch and the fixed contact area of the slide switch. A structure for preventing the lubricant from flowing into the printed circuit board, wherein a rib is provided to prevent the lubricant from flowing into the fixed contact region of the push switch.

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