JP3161954B2 - Switch mechanism on printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electronic circuit using a printed circuit board, and more particularly to a printed circuit board on which a mechanical switch is arranged.

[0002]

2. Description of the Related Art Today, printed circuit boards called printed circuit boards are frequently used in electronic circuits. This printed circuit board is made of a flat insulating material, has a large number of component holes such as through holes for penetrating the lead wires of circuit elements, and print wiring such as copper or gold plating for appropriately connecting the component holes. Are provided on the surface of the substrate, and there are those in which printed wiring is provided on both surfaces of the substrate, and those in which printed wiring is provided on only one surface of the substrate.

[0003] A printed circuit board having printed wiring on both sides can mount many circuit elements on the printed circuit board. However, on both sides of the printed circuit board, a soldering operation for fixing and connecting lead wires to the printed wiring is performed. Must be
There are drawbacks in that many steps are required for production and the work of each step is complicated. Also, on a printed circuit board with printed wiring on one side, the number of circuit elements attached to this board is limited by the size of the board, etc. By projecting the lead wire through the component hole and projecting from the back surface, the soldering work for connecting the lead wire and the printed wiring can be performed extremely easily in one operation, and there is an advantage that mass productivity is excellent.

Further, there is a strong demand for miniaturization of electronic circuits using a printed circuit board, and contrivances have been made to increase the integration density of each element while miniaturizing the elements to be mounted.
In a display circuit having an operation switch together with a display element such as a fluorescent display tube, it is often required to provide the display element and the switch element on the surface of the substrate. When a small circuit board is mounted on the surface of a printed circuit board, a printed circuit board is also used for the printed circuit board, and the switch element has no lead wires drawn out on the surface of the printed circuit board. Attaching has been done.

[0005]

On the circuit board of a display circuit, when a switch element having lead wires is used and a printed circuit board having printed wiring on one side is used, the switch element becomes large, although mass productivity is excellent. As a result, there is a disadvantage that it is difficult to reduce the size of the entire printed circuit board.

[0006] Mounting a switch element on the surface of a printed circuit board on which printed wiring is also provided has a drawback in that the work of mounting the switch element and other elements becomes difficult. SUMMARY OF THE INVENTION The present invention facilitates miniaturization of a circuit board on which a switch element is provided, and does not reduce the productivity of the circuit.

[0007]

According to the present invention, there is provided a switch body having a shaft portion and an enlarged portion having conductivity at or near an end of the shaft portion. Part penetrates the board with the printed wiring on the back side, the enlarged part of the switch body is arranged on the back side of the printed circuit board, and on the back side of the printed circuit board, the contact part divided by the printed wiring near the penetration point of the shaft part And an elastic body that urges the enlarged portion toward the printed board is disposed between the substrate and the fixing portion that fixes the substrate.

According to the present invention, since the printed wiring is provided on the back surface, the circuit elements can be collected on the front surface and the printed circuit board can be easily soldered. Since it is formed, there is no need to attach a separate switch element to the printed circuit board, and the printed circuit board can be easily reduced in size. The conductive enlarged portion may be formed by fitting a metal E-ring to the shaft portion.

As described above, when the enlarged portion is formed by using the E-ring, the shaft portion can be easily penetrated through the printed board by attaching and detaching the E-ring, and the arrangement of the contacts on the printed board, and furthermore, the printed wiring. Layout design becomes easy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a switch mechanism in a printed circuit board according to the present invention is such that a switch button 21 is protruded from a printed circuit board 10 by a shaft portion 23 penetrating the board 10 as shown in FIG. The enlarged portion 25 positioned on the back surface of the substrate 10 is pressed against the back surface of the substrate 10 by an elastic body such as a rubber member 30.

Switch buttons are provided at both ends of the shaft portion 23.
As shown in FIG. 2, the switch body 20 having the enlarged portion 21 and the protrusion 21 has a rod-shaped shaft portion 23 protruding from the back surface of the thick circular switch button 21, and the shaft portion 23 has The enlarged portion 25 also has an enlarged portion 25, and the side surface of the enlarged portion 25 facing the switch button 21 is a plane orthogonal to the axial direction of the shaft portion 23, and is further subjected to at least the enlarged portion by performing carbon printing 26 or the like. It gives conductivity to the surface of 25.

As shown in FIG. 3, the printed circuit board 10 has a U-shaped notch 17 formed from the edge of the printed circuit board 10, and the width of the notch 17 is determined by adjusting the width of the shaft in the switch body 20. Make the shaft part 23 slightly larger than the diameter of the part 23
Can be inserted into the notch 17, and printed wiring 13 is formed on both sides of the notch 17 at the tip end position in the same manner as an appropriate printed wiring 13 for connecting the component hole 11. In the printed wiring 13 arranged on both sides of the front end, two contact portions 15 are formed separately.

The gap between the two contact portions 15 is made smaller than the diameter of the enlarged portion 25 of the switch body 20, and
25 allows two contact portions 15 to be connected. Then, the printed circuit board 10 is
As shown in FIG. 1, when the printed circuit board 10 is positioned in the mounting groove 47 of the fixed portion 41 and the printed circuit board 10 is fixed to the fixed portion 41 by the engaging portion 43 or the like, as shown in FIG. The rubber member 30, which is an elastic body, is inserted into a space formed between the
The enlarged portion 25 of the switch body 20 into which the
By means of 30, a pressure is applied to the back surface of the printed circuit board 10 so as to be pressed against it.

As shown in FIG. 4, the rubber member 30 has a thick disk-shaped pressing portion 31, a deformable deformable portion 33 projecting from the side of the pressing portion 31 as a truncated cone, and a deformable portion 33. And an annular reinforcing portion 35 provided at the tip of the. Therefore, the printed circuit board 10 fixed to the fixing portion 41 and the fixing portion 41 are so contacted that the pressing portion 31 contacts the enlarged portion 25 of the switch body 20.
If the height according to the gap is set, the upper surface of the enlarged portion 25 is pressed against the back surface of the substrate 10, and when the switch button 21 is pressed, the deformed portion 33 is deformed and the pressing portion 31 can be lowered. You can do it.

The deformed portion 33 of the rubber member 30 is not limited to a straight truncated cone, but may be a curved spherical bowl as appropriate. When the printed circuit board 10 is fixed to the fixing portion 41 in this manner, each element 10 such as the display element 51 is arranged on the surface of the printed circuit board 10 and the tip of the lead wire 53 penetrating through the component hole 11 is connected to the printed circuit board 10. Is fixed to the printed wiring 13 on the back surface, and the fixing portion 41 may be formed as appropriate as a case of an apparatus using this circuit.

Further, the enlarged portion 25 may be formed of a conductive resin in addition to the case where the side facing the switch button 21 is subjected to carbon printing 26 to impart conductivity. As described above, if the rubber member 30 is used as the elastic body, and the rubber member 30 is disposed between the printed board 10 and the fixing portion 41 and the enlarged portion 25 having conductivity is pressed against the back surface of the printed board 10, When pressing the switch button 21 to separate the enlarged portion 25 from the back surface of the printed circuit board 10, the click portion was generated when the deformed portion 33 was deformed, and even when the small switch button 21 was slightly moved, the switch was operated. The feeling can be reliably given to the operator.

The positioning of the rubber member 30 may be facilitated by appropriately forming a recess 45 in the fixing portion 41 in accordance with the position of the rubber member 30. Further, the switch body 20 is not limited to the one in which the switch button 21 and the enlarged portion 25 are formed at both ends of the shaft portion 23 by integral molding.
As shown in FIG. 5, a switch body 20 in which a switch button 21 and a shaft portion 23 are integrally formed is provided.
An annular fitting groove 24 is formed in the vicinity of the tip of the shaft portion 23 in the above, and a metal E-ring is formed in the fitting groove 24.
The E-ring 27 may form the enlarged portion 25 by fitting and fixing the 27.

In this case, when the E-ring 27 as the enlarged portion 25 is attached to the switch body 20, the shaft portion 23 can be attached through the hole 19 provided in the printed circuit board 10 and then attached. As shown, a hole 19 having a diameter slightly larger than the diameter of the shaft portion 23 is formed.
It is possible to form two separate contact portions 15 around the periphery of 19.

As described above, if the enlarged portion 25 is formed as an easily removable E-ring 27, when the switch body 20 is provided so that the shaft portion 23 penetrates the printed circuit board 10, it is cut off from the edge of the printed circuit board 10. Forming the notch 17, forming the enlarged portion 25 on the back surface of the printed circuit board 10, and forming the hole portion 19 at a required portion of the printed circuit board 10 without limiting to the case where the switch button 21 is arranged above the printed circuit board 10. The switch body 20 can be mounted on the printed circuit board 10 so that the shaft portion 23 of the switch body 20 penetrates the printed circuit board 10, and the mounting position of the switch can be freely set.

Further, by inserting the tip of the E-ring 27 into the through hole 37 of the rubber member 30 and fixing the rubber member 30 to the tip of the shaft portion 23, the printed circuit board 10 is fixed to the fixing portion 41.
When assembling the switch on the printed circuit board 10, assembly of the switch can be further facilitated. In addition, shaft part
Also in the above-described switch body 20 in which the switch button 21 and the enlarged portion 25 are integrally formed at both ends of 23, the enlarged portion 25
A protrusion is formed at the center end of the rubber member 30.
In some cases, the rubber member 30 is attached to the switch body 20 by being fitted into a through hole 37 formed at the center of the pressing portion 31 in the above, to facilitate assembly of the switch.

Further, the elastic member is not limited to the rubber member 30 having the pressing portion 31 and the deforming portion 33, but may be an elastic member such as a helical spring.

[0022]

The present invention is a switch mechanism in which a shaft portion penetrating a printed circuit board is provided and a contact portion by printed wiring is directly formed on the back surface of the printed circuit board. Therefore, individual switch elements having lead wires are used. Mechanical switch can be formed on the back side of the printed circuit board without
The circuit can be constituted by a small printed circuit board. In addition, printed wiring such as contact points can be arranged on the back side of the board, soldering work is easy, and it is possible to operate switches from the front side of the printed board and to be a printed board excellent in mass productivity Can be done.

When the enlarged portion of the switch body is easily detachable from the switch body by an E-ring, it is easy to penetrate the shaft portion of the switch body through the printed circuit board, and the printed circuit board on which the switch is formed is formed. Is hardly restricted, and the degree of freedom in arranging the elements on the printed circuit board including the arrangement of the switches is increased. Therefore, the switch can be operated from the front surface of the printed circuit board, and the design and manufacture of a small-sized printed circuit board that is easy to manufacture can be further facilitated.

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of a switch mechanism according to the present invention.

FIG. 2 is a perspective view showing a switch body used in the switch mechanism according to the present invention.

FIG. 3 is a diagram showing an example of a printed circuit board of the switch mechanism according to the present invention.

FIG. 4 is a view showing a rubber member used for the switch mechanism according to the present invention.

FIG. 5 is a perspective view showing another example of the switch body used for the switch mechanism according to the present invention.

FIG. 6 is a view showing another example of the switch mechanism printed circuit board according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Printed circuit board 11 Component hole 13 Printed wiring 15 Contact part 17 Notch part 19 Hole part 20 Switch body 21 Switch button 23 Shaft part 24 Fitting groove 25 Enlarged part 26 Carbon printing 27 E-ring 30 Rubber member 31 Pressing part 33 Deformation part 35 Reinforcement part 37 Through-hole 41 Fixed part 43 Engagement part 45 Depression 47 Mounting groove 51 Element 53 Lead wire

Claims (2)

(57) [Claims] A switch body having a shaft portion and an enlarged portion having conductivity at or near an end of the shaft portion, wherein the shaft portion of the switch body has a printed wiring on a back surface. The enlarged portion of the switch body is disposed on the back surface of the printed circuit board by penetrating the printed circuit board, and the printed circuit board has a contact portion separated by printed wiring near the penetrating portion of the shaft portion on the back surface of the printed circuit board. A switch mechanism for a printed circuit board, wherein an elastic body for urging the enlarged portion toward the printed circuit board is arranged between the printed circuit board and a fixing portion for fixing the printed circuit board. 2. The switch mechanism according to claim 1, wherein the enlarged portion having conductivity is a metal E-ring, and the E-ring is fitted to the shaft portion.