JPH1021783A - Structure of fixing thin metal contact piece to printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fixing structure capable of accurately and simply fixing a contact piece made of a thin metal spring material to a wiring terminal position of a printed board and mechanizing the fixing. SOLUTION: Through holes 3a having a size capable of supporting the periphery of a contact piece 2 are formed in the position, corresponding to the wiring terminal position of the printed board 4, of a fixing plate material 3 having almost the same contour as a printed circuit board 4, a tapered step part having the same shape as the periphery of the contact piece 2 and a guide pin 3c are formed in the periphery of the through hole 3a, and the periphery of the contact piece 2 is guided so that the contact piece 2 and the insertion hole 3a come in almost the concentric position. Columnar projections 3d are formed in the fixing plate material 3, projection insertion holes 4b are formed in the position, corresponding to the projection 3d, the projection 3d is inserted into the insertion hole 4b, the tip of the projection 3d is deformed by heating, and the fixing plate material 3 and the printed board 4 is fixed. In the fixed state, the periphery of the contact piece 2 is interposed and fixed between the wiring terminal position of the printed board 4 and the periphery of the through hole 3a of the fixing plate material 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin and minute dome-shaped or rectangular arch-shaped device for connecting / disconnecting between wiring terminals of a printed circuit board by utilizing elastic deformation and elastic return by pressing a switch button. More specifically, the present invention relates to a fixing structure for directly fixing a contact piece made of a metal spring material to a printed circuit board. The present invention relates to a structure for fixing a metal contact piece to a printed circuit board, which secures performance.

[0002]

2. Description of the Related Art Generally, an operation controller for a game machine, a remote controller for various audio products, an air conditioner, a remote controller for various home electric appliances such as a TV, and the like, have switch parts fixed to required wiring terminals on a printed circuit board. In a state where the switch button is provided on the upper part of the parts, all the parts are housed in a casing. Conventional switch components applied to remote controllers and the like include, for example, FIG.
As shown in FIG. 1, a housing 2 formed of an open box having a contact 21a connected to a wiring terminal of a printed circuit board on a bottom surface.
An arc-shaped contact piece 5 made of a rectangular metal leaf spring material whose central portion bulges in an arch shape is placed and fixedly stored on the bottom surface of the contact piece 1. There is a switch module 20 provided with a stem 22 for pressing the central bulging portion 5a. As shown in FIG. 12, a dome-shaped contact piece 2 made of a metal spring material having a part of a spherical surface is provided on the bottom surface of the housing 31 in the same manner as described above, in place of the arch-shaped contact piece 5. The contact piece 2 is placed on the upper side of the contact piece 2, and the central portion 2a
The switch module 30 in which the stem 32 is disposed so as to press the switch is also used.

The above-mentioned switch modules 20 and 30 are individually fixed to wiring terminal portions of a printed circuit board by fixing leg pieces 23 and 33 provided outside the housings 21 and 31, respectively. The stems 22 and 32 are pressed by a pressing operation, and the contact pieces 2 and 5 are pressed.
The elastic deformation and elastic return of the terminal
The desired operation of the remote controller or the like is performed by repeating the cutoff.

[0004] In the above-described switch modules, the contact pieces 2 and 5 and the stem 2 are provided inside the housings 21 and 31.
Since they have built-in 2, 32, they are bulky, and remote controllers and the like equipped with them are also large and thick, and cannot respond to recent demands for miniaturization and thinning.
In addition, the switch modules 20 and 30 must be individually fixed to each part of the wiring terminal as described above, and the operation is complicated.
Since the wiring circuit is designed in consideration of the area occupied by the 0, 30 printed circuit boards, the design is also limited.

Therefore, in recent years, only the arch-shaped or dome-shaped contact piece made of a thin metal spring material incorporated in the above-described conventional switch module is directly placed on a portion corresponding to a wiring terminal of a printed circuit board and then pasted. The switch is attached and fixed with an adhesive tape to reduce the size and thickness of the switch, and to diversify the design of the remote controller and the like.

[0006]

However, since the contact piece is simply fixed on the printed circuit board with an adhesive tape as described above without using any special positioning means or guide means, In addition, there is a case where it is easy to move on a printed circuit board and cannot be accurately fixed to a desired wiring terminal portion. This is unstable even when a single contact piece is attached and fixed with an adhesive tape, and it is attempted to fix a large number of contact pieces with a single adhesive tape on the same printed circuit board at once. In this case, the positional deviation of each contact piece is further increased, and the working efficiency is significantly reduced. Furthermore, since the fixing work described above depends on humans, and the work itself is a very rooted and complicated work,
Conventionally, mechanization was impossible, and the working efficiency was further reduced.

[0007] Therefore, a slightly protruding claw portion is formed on the peripheral edge of the contact piece, and the claw portion is engaged with a concave portion formed on the surface of the printed circuit board to temporarily fix the contact piece on the printed circuit board. Attempts have been made to improve the positioning accuracy. However, the claw portion must be formed in an extremely small shape so as not to hinder the elastic deformation and the elastic return of the contact piece. Requires some experience, and even a slight vibration of the printed circuit board makes it easy for the claws to slip out of the recesses and move the contact pieces. Could not be fixed.

Accordingly, an object of the present invention is to provide a fixing structure that can accurately and easily fix a contact piece made of a thin metal spring material to a wiring terminal portion of a printed circuit board, and can mechanize the fixing operation. And

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is provided at a wiring terminal portion of a printed circuit board.
A structure for fixing a contact piece made of a thin metal spring material for connecting / disconnecting the terminals by a pressing operation to the printed board, the contact piece having an outer shell having substantially the same shape as the printed board, A fixing plate material for clamping and fixing the printed circuit board to the printed circuit board, the fixing plate material being formed at a portion corresponding to a wiring terminal portion of the printed circuit board, and having a size capable of supporting a peripheral edge of the contact piece. And a contact piece guiding means for guiding the periphery of the contact piece so that the through hole and the contact piece are substantially concentric with each other, and a fixing means for fixing the contact piece to the printed circuit board. A main structure is a fixing structure of the contact piece to the printed circuit board, which is sandwiched and fixed between a wiring terminal portion of the printed circuit board and a peripheral portion of a through hole of the fixing plate material.

[0010] The contact piece may be an arch-shaped contact piece having a rectangular metal spring material whose central portion is bulged in an arch shape.
Alternatively, there is a dome-shaped contact piece made of a metal spring material having a shape of a part of a spherical surface whose central portion is swollen. In order to fix the contact piece to the printed circuit board by the above-mentioned fixing structure of the present invention, first, the contact piece is guided by the contact piece guiding means of the fixing plate material, and the bulging surface of the contact piece is penetrated. Place it so that it fits into the hole. In this state, the printed circuit board is overlapped with the fixed plate material from the side where the contact pieces are mounted, and the printed circuit board and the fixed plate material are integrated by the fixing means. At this time, since the peripheral edge of the contact piece is sandwiched between the printed board and the through-hole peripheral portion of the fixing plate material to perform positioning, the contact piece is accurately fixed to a predetermined portion of the printed board. And the fixing work is very simple.

Also, during this fixing operation, the contact piece is guided by the guide means and is always supported by the periphery of the through hole, so that there is no displacement and the contact piece is accurately positioned at the wiring terminal portion of the printed circuit board. Fixed. Furthermore, even when a large number of the contact pieces are fixed to the printed circuit board at the same time, by using the fixing plate material as described above, each contact piece can be simply and accurately positioned at a predetermined wiring terminal portion. In addition, accurate positioning and fixing can be performed at the same time by a simple operation of merely superimposing the printed circuit board on the fixing plate member, so that the fixing operation can be mechanized, and the production efficiency can be significantly improved.

Preferably, the contact piece guiding means comprises at least three or more guide pins formed along the periphery of the contact piece around the through hole, for example. The guide pin accurately guides the contact piece to the through hole of the fixed plate material as described above during the fixing work of the contact piece, but fixes the fixed plate material to the printed board, After fixing the contact piece to the printed circuit board, when the contact piece is pressed and elastically deformed and returned,
A peripheral edge of the contact piece is supported so that the contact piece does not shift from the through hole.

When the guide pins are employed, it is preferable that a pin insertion portion is formed at a portion of the printed circuit board corresponding to the guide pins. And the positioning of the contact piece with respect to the wiring terminal portion of the printed board is further improved. The contact piece guiding means may be a step formed along the periphery of the through hole. In this case, it is preferable that the step portion has the same tapered surface as the peripheral edge of the contact piece, and since the peripheral edge of the contact piece is tightly supported on the tapered surface, elastic deformation due to pressing of the contact piece is reduced. Even at the time of the return, the peripheral edge is securely supported, so that the positional deviation does not occur.

More preferably, the contact piece guiding means includes at least three or more guide pins formed around the through-hole so as to surround the periphery of the contact piece, and a step formed at the periphery of the through-hole. In this case, the respective functions described above are exhibited, and the contact pieces are more accurately positioned on the printed circuit board.

The fixing means comprises a columnar projection made of a thermoplastic resin projecting from the surface of the fixing plate material higher than the thickness of the printed board, and the printed board is inserted into a portion corresponding to the columnar projection. Preferably, a hole is formed, and the tip of the columnar projection inserted into the projection insertion hole is heated and deformed to fix the printed board and the fixing plate material. In this case, since the fixing plate member and the printed board can be accurately positioned and fixed by the columnar projections serving as the fixing means and the projection insertion holes, the contact pieces can be positioned at predetermined wiring terminal positions on the printed board. Can be accurately positioned and fixed. It is more preferable that the fixing is performed by fixing the columnar projections, because no rattling occurs.

Further, it is also possible to employ an adhesive as the fixing means. In this case, the fixing plate material is provided with a fixing protrusion projecting lower than the thickness of the printed board, and a blind hole substantially equal to the protrusion height is formed on the printed board at a portion corresponding to the fixing protrusion. The inner surface of the same blind hole and the projection are bonded and fixed via the adhesive. In this aspect, the projection and the blind hole also have a function of positioning the printed board and the fixing plate.

Further, at least three or more guide pins projecting around the through hole along the peripheral edge of the contact piece and lower than the thickness of the printed circuit board serve as the contact piece guide means as described above. Not only with a blind hole formed in a portion of the printed circuit board corresponding to the guide pin,
It functions as a means for positioning the printed circuit board and the fixed plate material. Further, if the guide pin and the blind hole are bonded and fixed with an adhesive, the adhesive serves as a means for fixing the printed circuit board and the fixing plate. In this case, it is not necessary to provide any special positioning or fixing members on the fixed plate member and the printed board, and the range of choice of wiring design to the printed board can be expanded.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 10 is a general explanatory view of a connection / interruption mechanism between terminals by contact pieces according to the present invention, and a portion of the printed circuit board 1 corresponding to a pair of wiring terminals 1a, 1a is provided between the terminals 1a, 1a. Contact pieces 2 and 5 having various forms for connecting / disconnecting
Is directly mounted and fixed. As a typical form,
As shown in an enlarged manner in FIG. 10 (a), there is a dome-shaped contact piece 2 having a very small thickness and a minute shape made of a metal spring material forming a part of a spherical surface whose central portion bulges upward. The dome-shaped contact piece 2 is elastically depressed as shown by the imaginary line in the figure when the central portion 2a is pressed, and the central portion 2a comes into contact with one terminal 1a of the printed circuit board and a pair of terminals 1
a and 1a are connected and conductive, and an electric signal is sent to drive a predetermined circuit. When the pressing is released, the dome-shaped contact piece 2 elastically returns to its original shape, and the terminals 1a, 1a
During this time, the operation of the circuit is continued. To stop the driving, the contact piece 2 or another contact piece is pressed again to send a drive stop signal to the circuit.

As an example of a contact piece having another form, as shown in FIG. 10B, two parallel cuts are made in a rectangular metal spring plate material, and a center portion 5a and portions on both sides thereof are formed. There is an arch-shaped contact piece 5 which bulges out in a substantially arch shape in the opposite direction to 5b. Similarly to the above-mentioned dome-shaped contact piece 2, the arch-shaped contact piece 5 also presses the central bulging portion 5a to elastically depress as shown by the imaginary line in FIG. And the terminals 1a, 1a
When the connection is established and the pressing is released, the bulging portion 5a elastically returns to its original shape, and the terminals 1a, 1a are electrically connected. The aforementioned pressing operation of the dome-shaped contact piece 2 and the arch-shaped contact piece 5 is conventionally performed by pressing / releasing the switch button via the stem as described above.

The present invention relates to a contact piece fixing structure for directly fixing a plurality of contact pieces 2, 5 to a printed circuit board without individually assembling the contact pieces 2, 5 as a switch module. Preferred embodiments of the present invention will be specifically described with reference to the drawings. The fixing structure according to the present invention includes a fixing plate having substantially the same outer shape and thickness as the printed board, and holding and fixing the contact pieces 2 and 5 to the printed board.

FIG. 1 is an exploded perspective view showing an entire structure for fixing a dome-shaped contact piece 2 to a printed circuit board 4 according to a first embodiment of the present invention, and FIG. It is a top view at the time of assembling the fixing plate material 3 which clamps and fixes between them. The fixing plate 3 is made of a thermoplastic synthetic resin. The fixing plate 3 supports the outer periphery of the dome-shaped contact piece 2 at a position corresponding to a pair of terminal positions of a printed wiring (not shown) of the printed circuit board 4. A through hole 3a having a sufficient peripheral edge is formed. FIG. 3 is an enlarged top view of the through hole 3a, and FIG. 4 is a sectional view of the through hole 3a. A tapered step portion 3b having the same shape as the peripheral edge of the dome-shaped contact piece 2 and having a tapered surface narrowing to the back is formed on the periphery of the through hole 3a on the contact piece fixing side. Between the opposite surface (lower surface), a large funnel shape extends toward the opposite surface and penetrates.

Further, three guide pins 3c are provided at equal intervals along the periphery of the contact piece 2 at the periphery of the through hole 3a. The dome-shaped contact piece 2 is connected to the guide pin 3c.
3 and FIG. 4, the central portion 2a is fitted into the through hole 3a as shown by a virtual line, and the peripheral edge of the contact piece 2 is positioned and supported in close contact with the tapered step 3b. , Are automatically set to a position substantially concentric with the through hole 3a. On the surface of the fixed plate 3 on which the tapered step 3b and the guide pin 3c are formed, a columnar projection 3d is further integrally provided. The position where the columnar projection 3d is formed does not interfere with the wiring of the printed circuit board 4, and the height of the protrusion is set higher than the thickness of the printed circuit board 4. In the present embodiment, as shown in FIG. A concave groove 3e is formed around the columnar projection 3d.

On the other hand, as shown in FIG. 1, the printed circuit board 4 has a guide pin 3c at a position corresponding to the guide pin 3c.
Is formed, and a projection insertion hole 4b slightly larger in diameter than the columnar projection 3d is formed in a portion corresponding to the columnar projection 3d.

In order to fix the dome-shaped contact piece 2 to the printed circuit board 4 using the fixing plate 3, first work the fixing plate 3 with the side on which the guide pins 3 c and the like are formed upward. Place on a table. The contact piece 2 is fitted into the through-hole 3a of the fixing plate 3 while guiding the contact piece 2 with the bulging surface downward by the guide pin 3c.
Is brought into close contact with the tapered step 3b. At this time, the contact piece 2 is automatically set at a substantially concentric position with the through hole 3a. Thereafter, the printed circuit board 4 is superimposed on the fixed board 3 with the side having the wiring terminals facing downward. At this time, the pin insertion holes 4a of the printed board 4 are inserted into the guide pins 3c of the fixed board 3. At the same time, the projection insertion hole 4b is inserted into the columnar projection 3d. Thereby, the printed circuit board 4 is accurately positioned with respect to the fixed plate 3.

Next, for example, a heating press plate is pressed against the tip of the columnar projection 3d projecting from the projection insertion hole 4b from above to heat the columnar projection 3d. By this heating and pressing operation, the distal end portion of the protrusion 3d is melted and deformed while being spread laterally, and as shown in FIG. 6, the deformed distal end portion 3d '
As a result, it is welded to the surface of the printed circuit board 4 so as to sandwich the periphery of the projection insertion hole 4b and integrated with the fixed plate 3. Further, in this embodiment, the protrusion insertion hole 4
Since b is set slightly larger than the diameter of the columnar projection 3d, a part of the molten resin flows into the insertion hole 4b, and the columnar projection 3d and the inner peripheral surface of the projection insertion hole 4b are separated. It is welded and the fixing strength is improved. At this time, a part of the molten resin simultaneously flows into the concave groove 3e formed around the columnar projection 3d, and the distal end portion and the base end portion of the columnar projection 3d are welded together so as to sandwich the printed circuit board 4. Therefore, rattling between the fixing plate 3 and the printed circuit board 4 is eliminated, and the fixing of the contact piece 2 is also ensured.

In this embodiment, as described above, a part of the columnar projection 3d is melted and welded to the printed circuit board 4, and a part of the molten material of the columnar projection 3d is removed from the groove 3d.
However, when the tip of the columnar projection 3d is simply heated and pressed to soften and the tip is swelled and deformed, the concave groove 3e becomes unnecessary. However, in this case, the diameter of the columnar projection 3d and the diameter of the projection insertion hole 4b need to be matched to such an extent that there is no backlash. Also,
The insertion hole 4b of the printed circuit board 4 is generally formed by pressing. Therefore, burrs are easily generated around the insertion hole 4b. The concave groove 3e also serves as a space for accommodating those burrs, and also has a function of bringing the fixed plate 3 into close contact with the printed board 4 when the columnar projection 3d is inserted into the projection insertion hole 4b. doing.

As described above, the printed circuit board 4 and the fixed plate member 1 are fixedly integrated with each other to form the contact piece 2.
The peripheral edge is pinched between the wiring terminal portion of the printed board 4 and the tapered step 3b formed at the peripheral edge of the through hole 3a of the fixing plate 3, and is firmly fixed to the printed board 4. As described above, the contact piece 2 is guided only by the guide pin 3c of the fixed plate material 3, and the through hole 3
a, the contact pieces 2 are not displaced from the through holes 3a of the fixed plate 3 so that a large number of contact pieces 2 can be attached to the printed circuit board 4 in one operation. It can be fixed. Further, since the fixing plate 3 and the printed board 4 are accurately positioned by the guide pins 3c and the pin insertion holes 4a, the columnar projections 3d and the projection insertion holes 4b, the contact pieces 2 are The printed wiring board 4 can be easily and reliably fixed to a predetermined wiring terminal site without special skill. Since such fixing work does not necessarily need to depend on humans, it can be automated and leads to remarkable improvement in productivity.

FIG. 7 is an exploded perspective view showing an example of the remote controller 10 using a printed circuit board having a large number of dome-shaped contact pieces 2 fixed at predetermined positions with a fixing plate as described above. The remote controller 10 includes upper and lower casings 11 and 12.
A printed circuit board 4 housed and fixed in the casings 11 and 12 together with the fixed plate member 3; and a switch button 13 for pressing the contact piece 2 fixed to the printed circuit board 4. I have.

The remote controller 10 firstly receives the fixed plate 3
After placing the printed circuit board 4 at a predetermined position of the lower casing 12 with the upper surface as a top and fixing them together with screws or the like,
The upper casing 11 in which various switch buttons 13 are fitted to predetermined portions is fitted to the lower casing 12. On the lower surface of the switch button 13, a projection 13a for pressing each corresponding contact piece 2 is provided so as to project therefrom. In the illustrated example, some of the switch buttons 13 are attached via a plurality of elastic rods 13c branched from the base member 13b, and the switch buttons 13 are exposed from the inside of the upper casing 11 to the outside. Is fitted to a window 11a formed in the casing 11. One switch button 13 has four projections 13a on its lower surface, and a predetermined window 11
b, and the projections 13a are installed facing the corresponding contact pieces 2 on the printed circuit board 4 through the holes 14a of the spacers 14 arranged inside the casing 11. At the center of the lower surface of the switch button 13 having the four projections 13a, a column (not shown) is provided so as to project therefrom. Each of the projections 13a of the switch button 13 is individually up and down around the column. It is designed to move. The upper and lower casings 11 and 12 are fixed so as to be disassembled according to a conventional method.

The remote controller 10 thus assembled
By selectively pressing the operation button 13, the protrusion 13 a presses and deforms the contact piece 2 through the through hole 3 a of the fixing plate 3. At this time, since the through-hole 3a of the fixed plate 3 is greatly expanded in a funnel shape toward the opposite surface (lower surface) of the plate 3, the protrusion 13a surely presses the central portion 2a of the contact piece 2. Will be guided to. By the pressing / releasing operation of the operation button 13, the contact piece 2 repeats elastic deformation and return, connection and disconnection between the wiring terminals of the printed circuit board 4 are performed, and a desired remote control operation is performed. When the contact piece 2 is pressed and elastically deformed / returned, the peripheral edge of the contact piece 2 is guided by the guide pin 3c, and the peripheral edge of the contact piece 2 is formed by the tapered step portion 3b of the fixed plate member 3. The contact piece 2 does not laterally shift or incline from the through hole 3a, and the initial posture and form are always maintained.

FIG. 8 is an exploded perspective view showing a structure for fixing the arch-shaped contact piece 5 to the printed circuit board 7 according to the second embodiment of the present invention, and FIG. 9 is a sectional view showing the same fixing structure. The fixing plate 6 used in the fixing structure of the present embodiment also has an outer shape and a wall thickness substantially the same as those of the printed circuit board 7. The fixing plate 6 has a through-hole 6a large enough to support the peripheral edge of the arch-shaped contact piece 5 at a portion corresponding to a wiring terminal portion (not shown) of the printed board 7, and the through-hole 6a A step 6b having the same shape as the outer periphery of the arch-shaped contact piece 5 is formed at the peripheral edge of the arch-shaped contact piece 5, and supports four edges of the arch-shaped contact piece 5 along the periphery of the step 6b. The guide pin 6c of the book protrudes. Further, the fixing plate member 6 is provided with a fixing protrusion 6d which is thinner than the thickness of the printed circuit board 7. On the other hand, in the printed circuit board 7, a pin insertion blind hole 7a for inserting the guide pin 6c is formed at a portion corresponding to the guide pin 6c on the side having the wiring terminal.
A blind hole 7b having substantially the same shape as that of the fixing projection 6d is formed in a portion corresponding to.

In order to fix the arch-shaped contact piece 5 to the printed circuit board 7 using the fixed plate material 6, first, the central bulging portion of the arch-shaped contact piece 5 is inserted into the through hole 6a of the fixed plate material 6. 5a is fitted with the bulging surface thereof facing downward while being guided by the guide pins 6c. The contact piece 5 has a peripheral portion supported by the stepped portion 6b, and the through-hole 6a
It is automatically set to be approximately concentric with. Thereafter, an adhesive is applied to the fixing projection 6d of the fixing plate 6, and then the blind hole 7b is inserted into the fixing projection 6d, and the pin insertion blind hole 7a is inserted into the guide pin 6c. Then, the printed circuit board 7 is overlaid on the fixed plate 6. As a result, the protrusion 6d and the blind hole 7b are bonded by the adhesive, and the fixing plate 6 and the printed board 7 are fixed.

In the above-mentioned fixing operation, the contact piece 5 is always guided and supported by the fixing plate 6 by the stepped portion 6b and the guide pin 6c. The printed circuit board 6 and the printed circuit board 7 are accurately positioned with respect to each other by the fixing projection 6d and the blind hole 7b, and the guide pin 6c and the pin insertion blind hole 7a. Therefore, the contact piece 5 is accurately and easily fixed to the wiring terminal portion of the printed circuit board 7. Furthermore, even when the arch-shaped contact piece 5 is pressed and elastically deformed and elastically restored, the contact piece 5 is supported by the stepped portions 6b and the guide pins 6c, so that the contact piece 5 is There is no inconvenience such as a deviation from the through hole 6a.

In the above-described embodiment, the contact piece guiding means for guiding the dome-shaped contact piece 2 or the arch-shaped contact piece 5 into the through holes 3a, 7a of the fixing plate members 3, 7 is provided with a stepped portion 3b,
7b and the guide pins 3c and 7c. For example, only the guide pins arranged along the outer peripheral edge of the contact pieces 2 and 5 can be used as the contact piece guide means. As long as there is no large vibration in the fixing operation, the contact pieces 2 and 5 can be guided and supported to prevent displacement.

As contact piece guide means, a plurality of guide pins, which are thinner than the thickness of the printed circuit board, are protruded along the periphery of the contact piece around the through hole of the fixed plate material. Form a blind hole at the site corresponding to the pin,
The blind hole and the guide pin may be adhered to each other with an adhesive, and the fixing plate and the printed circuit board may be fixed at the same time as the positioning. In that case, since it is not necessary to separately provide a fixing member for fixing the fixed plate material and the printed board, the structure of the fixed plate material and the printed board becomes easy, and wiring of the printed board is possible. Since the space is not reduced, the width of the wiring design is widened.

[0036]

As described above, according to the fixing structure of the present invention, the contact piece is a contact piece guiding means formed on the fixed plate material by using the fixed plate material sandwiched and fixed between the printed board and the printed circuit board. Since the peripheral edge of the contact piece is guided and supported by the step portion and the guide pin, the contact piece does not shift during the operation of fixing the contact piece, and the contact piece can be accurately and smoothly fixed. Further, by inserting guide pins, columnar protrusions or fixing protrusions formed on the fixed plate material into pin insertion portions, protrusion insertion holes or blind holes formed on the printed circuit board, the fixed plate material and the printed circuit board Positioning is performed accurately, so that the contact piece can be more accurately fixed to the wiring terminal portion. Further, in a series of fixing operations, there is no operation requiring skill and skill by hand as in the past, so that mechanization is possible and productivity is improved. Further, even when the contact piece is pressed to be elastically deformed and elastically restored, the contact piece is guided by the contact piece guiding means, so that no positional displacement occurs.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a fixing structure of a dome-shaped contact piece to a printed circuit board according to a first embodiment of the present invention.

FIG. 2 is a top view of a fixed plate member.

FIG. 3 is an enlarged top view of a through hole.

FIG. 4 is a sectional view taken along the line BB in FIG. 3;

FIG. 5 is a sectional view taken along line AA of FIG. 2;

FIG. 6 is a sectional view showing a fixing structure according to the first embodiment.

FIG. 7 is an exploded perspective view of the remote controller.

FIG. 8 is an exploded perspective view showing a structure for fixing an arch-shaped contact piece to a printed circuit board according to a second embodiment of the present invention.

FIG. 9 is a sectional view showing the fixing structure.

FIG. 10 is a general explanatory view of a connection / cutoff mechanism between terminals by a contact piece targeted in the present invention.

FIG. 11 is an exploded perspective view of a conventional switch module.

FIG. 12 is a perspective view showing another conventional switch module with a part cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 1a Wiring terminal 2 Domed contact piece 2a Central part 3 Fixed plate material 3a Through hole 3b Tapered step 3c Guide pin 3d Columnar projection 3d 'Deformed tip part 3e Recessed groove 4 Printed circuit board 4a Pin insertion hole 4b Projection insertion hole 5 arch-shaped contact piece 5a bulging portion 6 fixing plate 6a through hole 6b step 6c guide pin 6d fixing protrusion 7 printed board 7a pin insertion blind hole 7b blind hole 10 remote control 11 upper casing 12 lower casing 13 switch button 13a protrusion 13b base Member 13c Elastic rod 14 Spacer 14a Hole

Claims (10)

[Claims] A first terminal disposed on a wiring terminal of the printed circuit board;
A structure for fixing a contact piece made of a thin metal spring material for connecting / disconnecting between terminals by a pressing operation to the printed board, the contact piece having an outer shell having substantially the same shape as the printed board, A fixing plate material for sandwiching and fixing the printed circuit board is provided.The fixing plate material is formed at a portion corresponding to a wiring terminal portion of the printed board, and has a through hole having a size capable of supporting a peripheral edge of the contact piece. Contact point guiding means for guiding the peripheral edge of the contact piece so that the through hole and the contact piece are substantially concentric, and fixing means for fixing to the printed circuit board. A structure for fixing a contact piece to a printed circuit board, wherein the contact piece is fixed between a wiring terminal portion of the printed circuit board and a peripheral portion of a through hole of the fixing plate. 2. The contact piece guiding means includes at least three contact pieces formed along the periphery of the contact piece around the through hole.
The fixing structure according to claim 1, comprising the guide pin. 3. A pin insertion portion is formed on a portion of the printed board corresponding to the guide pin, and the guide pin is inserted into the pin insertion portion to position the fixed plate member and the printed board. The fixing structure according to claim 2. 4. The fixing structure according to claim 1, wherein said contact piece guide means comprises a step formed along said peripheral edge of said through hole. 5. The fixing structure according to claim 4, wherein said step portion has the same tapered surface as a peripheral edge of said contact piece. 6. The contact piece guiding means includes at least three contact pieces formed along the periphery of the contact piece around the through hole.
The fixing structure according to claim 1, comprising the guide pin and a step formed at a peripheral portion of the through hole. 7. The fixing means comprises a columnar projection made of a thermoplastic resin projecting from the surface of the fixing plate material higher than the thickness of the printed board, and the printed board has a projection at a portion corresponding to the columnar projection. The fixing structure according to claim 1, wherein an insertion hole is formed, and a distal end portion of the columnar projection inserted into the projection insertion hole is heated and deformed to fix the printed board and the fixing plate material. 8. The fixing structure according to claim 7, wherein the fixing is fusion. 9. The fixing means is made of an adhesive, and the fixing plate is provided with fixing protrusions having a thickness smaller than the thickness of the printed circuit board, and the printed circuit board has blind holes formed in portions corresponding to the fixing protrusions. The fixing structure according to claim 1, wherein the fixing hole is formed and the projection is adhered to the fixing member by the adhesive so that the fixing plate and the printed circuit board are fixed at the same time as the positioning. 10. The contact piece guide means comprises at least three or more guide pins projecting around the through hole along the periphery of the contact piece and lower than the thickness of the printed circuit board. It is made of an adhesive, and a blind hole is formed in a portion corresponding to the guide pin on the printed circuit board, and the blind hole and the guide pin are bonded by the adhesive,
The fixing structure according to claim 1, wherein the fixing plate and the printed board are fixed at the same time as the positioning.