JPH04253120A - Push button switch for lighting - Google Patents

Abstract

PURPOSE:To improve conatct reliability of a contact point by heightening water- proof and duct-proof properties. CONSTITUTION:A movable contact point 6 is set in the recessed part 2 of a body 1 and a push button 7 is pressed in the recessed part 2 under pressure fromabove the conatct point 6 so as to fix and set the push button in the body 1. Further, while the upper part of the push button 7 is projected from a hole 11a, an upper plate 11 is arranged there and the projected part 10 of the push button 7 is pushed by the lower face of the upper plate 11 and thus the upper plate 11 is pressed in the recessed part 2 under pressure to be arranged there. Since the end part of the movable contact point 6 is always sandwiched between the lower face of the outer circumference of the push button 7 and the upper face of a switch terminal 3b, the reability of the contact between the movable contact point 6 and the switch terminal 3 is improved. Furthermore, the upper plate 11 and the push button 7 provide double sealing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short-bodied illuminated pushbutton switch that displays the load status using a display element such as a light emitting diode on its operation surface.

0002

2. Description of the Related Art FIG. 11 shows a conventional illuminated push button switch, in which a dome-shaped movable contact 42 made of a spring is provided in a body 41.
A push button 43 for reversing the movable contact 42, a seal rubber 44, an upper plate 45, a spring 46, etc. are provided, and a switch holder 47 is engaged with the body 41 so as to cover the entire body.

Further, a frame 54 is engaged with the upper part of the switch holder 47 so as to be movable up and down, and a light emitting diode 48 and a screen 49 are provided on this frame 54. and,
A cap 50 is fitted onto the frame 47. Further, the end of the switch terminal 51 is always in contact with the outer periphery of the movable contact 42, and the end of the other switch terminal 51 is a fixed contact 52 facing the movable contact 42. Further, the body 41 is provided with an LED terminal 53 connected to the light emitting diode 48.

[0004]Here, by pressing the cap 50 constituting the illumination section and pressing the push button 43 downward at the frame 54 via the spring 46, the movable contact 42 is reversed and comes into contact with the fixed contact 52. do. When the operation is stopped, the frame 54 returns to its original position due to the restoring force of the spring 46, and the movable contact 42 is also reversed and returned to its original position, separating from the fixed contact 52.

[0005]

[Problems to be Solved by the Invention] In such a conventional example, a seal rubber 44 fixed by the body 41, the upper plate 45, and the push button 43 is incorporated in order to obtain a dustproof structure, and the waterproofness and dustproofness are not very high. There was a problem that the contact reliability of the contacts was poor. The present invention has been provided in view of the above-mentioned points, and provides an illuminated pushbutton switch that has high waterproofness and dustproofness and is intended to improve the contact reliability of the contacts.

[0006]

[Means for Solving the Problems] The present invention provides a switch terminal disposed on the bottom surface of a recessed portion of a body, a reversing spring whose central portion faces a fixed contact and whose outer peripheral portion contacts the upper surface of the switch terminal. A flexible push button whose outer peripheral surface presses against the inner peripheral surface of the recess to drive the reversing spring; and a flexible push button whose outer peripheral surface presses against the inner peripheral surface of the recess to drive the reversing spring; The upper plate is press-fitted into the upper plate.

[0007]

[Function] By press-fitting the upper plate and the push button into the recess of the body to create a double seal structure, the waterproof and dustproof properties are further improved, and the push button and switch terminal By constantly holding the outer periphery of the reversing spring between the two terminals, the contact stability between the reversing spring and the switch terminal is increased, and the contact reliability is improved.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 5 is a cross-sectional view of the entire assembled structure, FIG. 2 shows a switch block A forming a switch mechanism section, and FIG. 3 shows an LED block B forming a lighting section. Moreover, FIG. 4 shows an exploded view of the whole.

First, switch block A will be explained. A recess 2 with an opening on the top surface is formed in the body 1.
A switch terminal 3 and an LED terminal 4 are molded at the same time as the body 1. As shown in FIG. 7, both terminals 3 and 4 are provided in a pair of L-shapes projecting from the side surface of the body 1, respectively. As shown in FIG. 1, the end of one switch terminal 3a is exposed on the bottom surface of the recess 2 of the body 1 as a fixed contact 5. Further, the end of the other switch terminal 3b that becomes the contact point is also exposed on the bottom surface of the recess 2, and has a spring property and is always in contact with the end of the dome-shaped movable contact 6. . The center portion of the movable contact 6 constituting the reversing spring is pushed by the push button 7 located above and is deflected, and comes into contact with the fixed contact 5 of the switch terminal 3a to close the contact.

The push button 7 for bending the movable contact 6 is made of a rubber-like elastic body, and is formed in a shape that surrounds the spherical surface of the dome-shaped movable contact 6. Further, as shown in FIGS. 1 and 5, the push button 7 has a core material 8 made of a molded product, for example, to prevent buckling.
is buried there. The movable contact 6 is bent and reversed by the push button 7, so that it comes into contact with the fixed contact 5 directly below. It should be noted that since the push button 7 is made of an elastic body containing a core material 8, a suitable click feeling is obtained without buckling.

A circular recess 9 is formed in the lower surface of the push button 7 other than the part that contacts the fixed contact 5, and the push button 7 pushes only the contact part of the movable contact 6 that contacts the fixed contact 5. This recess 9 allows the movable contact 6 to easily reverse its spring state. Further, the outer peripheral side surface of the upper surface of the push button 7 is in pressure contact with the inner surface of the recess 2 of the body 1. Furthermore, a protrusion 10 is integrally formed on the outer periphery of the upper surface of the push button 7 in the circumferential direction.

Here, a movable contact 6 is provided in the recess 2 of the body 1.
is placed, press the push button 7 into the recess 2 from above,
A push button 7 is fixedly arranged within the body 1. As shown in FIG. 1, the upper plate 11 is placed with the upper part of the push button 7 protruding from the hole 11a, and the upper plate 11 is placed by pushing the protrusion 10 of the push button 7 with the lower surface of the upper plate 11. will be established. By press-fitting the upper plate 11 into the inner circumferential surface of the recess 2, the push button 7 is fixed at the outer circumference of the push button 7 with the end of the switch terminal 3b and the movable contact 6 interposed therebetween.

In this way, by sandwiching the end of the movable contact 6 between the lower surface of the outer periphery of the push button 7 and the upper surface of the switch terminal 3b, the contact reliability between the movable contact 6 and the switch terminal 3b is improved. I'm letting you do it. In addition, in the four corners of the upper surface of the body 1, as shown in FIGS. 2 and 7, there are holes 1 into which the lower part of a conductive coiled spring 12 for connecting a light emitting diode is inserted.
3 is formed. And at the bottom of this hole 13,
The end of the simultaneously molded LED terminal 4 is exposed and disposed so that when the spring 12 is inserted into the hole 13, it comes into contact with the end of the terminal 4.

Next, LED block B will be explained. An engagement hole 16 is bored in the lower part of the vertically penetrating cylindrical switch holder 14 to engage with an engagement claw 15 of the body 1 to connect the two. Furthermore, a protrusion 19 is provided on the inner surface of the switch holder 14 above the engagement hole 16 so as to protrude therefrom, on which a printed circuit board 18 on which a light emitting diode 17 is mounted is placed.

The inner surface of the upper opening of the switch holder 14 is formed with an inclined surface 20 whose opening becomes narrower toward the bottom.A screen 21 is formed with an inclined surface 22 that matches this inclined surface 20. 21 is arranged on the inclined surface 20. Incidentally, the screen 21 and the switch holder 14 are fixed by adhesive or welding.

Further, a cap 23 is placed over the top of the switch holder 14, and a locking hole 25 is formed in the cap 23 and is engaged with a locking protrusion 24 formed at the top of the switch holder 14. It has been set up. Here, Figure 2
When the switch block A shown in FIG. 3 and the LED block B shown in FIG. 3 are combined, the upper end of the spring 12 comes into contact with a patterned surface formed on the lower surface of the printed circuit board 18 to obtain electrical conduction.

A large number of light emitting diodes 17 are mounted on the printed circuit board 18 and connected by printed wiring. Therefore, when switch block A and LED block B are combined, LED terminal 4 and light emitting diode 1
7 is electrically connected via the spring 12 and the pattern on the printed circuit board 18. In addition, by providing four springs 12 for connecting the light emitting diodes 17, the printed circuit board 18
Even if light-emitting diodes of different colors are mounted on the board, they can be connected individually, making it possible to emit light in multiple colors.

The printed circuit board 18 is fixed to a switch holder 14 equipped with a screen 21 for character engraving and light diffusion and a cap 23, and when combined with the switch block A, press the push button 7 on the bottom of the printed circuit board 18 to press the switch. make it work. In addition, switch block A and LED
When combined with block B, the lower surface of the printed circuit board 18 is in contact with the upper surface of the push button 7.

As shown in FIG. 5, the length of the engagement hole 16 in the direction of insertion of the LED block B is made larger than that of the engagement claw 15,
The LED block B can be operated by pressing it. When the LED block B is not pressed, the printed circuit board 18 is biased by the spring 12, and the LED block B is always biased upward. Note that upward movement of the printed circuit board 18 is restricted by a stepped portion 26 formed on the inner surface of the switch holder 14.

When the LED block B is pressed, the lower surface of the printed circuit board 18 presses the push button 7, and the lower surface of the push button 7 presses the movable contact 6 downward. As a result, the movable contact 6 is reversed, the movable contact 6 and the fixed contact 5 come into contact, and the light emitting diode 17 lights up. Also, when you stop pushing the LED block B, the return force of the spring 12 causes the L
Simultaneously with the return of the ED block B, the movable contact 6 is reversely returned and the movable contact 6 is separated from the fixed contact 5.

FIGS. 8 to 10 show the illuminated push button switch main body X constructed as described above mounted on the panel 2 by the mounting frame 28.
9 is shown. In addition, switch terminal 3
Unlike the previous embodiment, the LED terminal 4 and the LED terminal 4 are made to protrude straight to the back. The mounting frame 28 is for arranging the main body X therein, and the front side of the mounting frame 28 is formed with a flange portion 30 that comes into contact with the front side of the panel 29, and the rear part has an elastic piece 31 that comes into elastic contact with the back side of the panel 29. is formed.

[0022] Also, waterproof rubber 32 is provided inside the mounting frame 28.
is attached by press-fitting its one end 32a into the groove 33 of the mounting frame 28. The other end 32b of the waterproof rubber 32 is press-fitted into a recess 34 formed on the outer surface of the switch holder 14. Further, a protrusion 36 protruding from the inside of the rear part of the mounting frame 28 connects to an engagement groove 35 formed on the outer surface of the body 1.
By engaging with the main body X, the main body X is attached to the mounting frame 28.

When attaching the main body X to the panel 29,
Attach the mounting frame 28 to the body 1 of the switch block A,
The panel 2 is assembled with the flange portion 30 of the mounting frame 28 and the elastic piece 31.
9 and attach it. Note that a packing 37 is inserted between the flange portion 30 and the panel 29. Mounting frame 2
One end 32a of the waterproof rubber 32 is press-fitted into L.
With the ED block B and the switch block A combined, the other end 32b of the waterproof rubber 32 is press-fitted into the recess 34 of the switch holder 14. Note that since the length between both ends of the waterproof rubber 32 is sufficiently long, by pulling out the other end 32b of the waterproof rubber 32 to the outside of the mounting frame 28, the switch holder 14
It can be easily press-fitted into.

As described above, since the waterproof rubber 32 is installed between the switch holder 14 and the mounting frame 28, and the packing 37 is inserted between the mounting frame 28 and the panel 29,
Waterproofness and dustproofness can be ensured on the front surface of the panel 29, and a short-bodied compact illuminated pushbutton switch can be provided.

[0025]

Effects of the Invention As described above, the present invention includes a switch terminal disposed on the bottom surface of a recess in a body, a reversing spring whose central portion faces a fixed contact and whose outer peripheral portion contacts the top surface of the switch terminal. A flexible push button whose outer peripheral surface presses against the inner peripheral surface of the recess to drive the reversing spring; and a flexible push button whose outer peripheral surface presses against the inner peripheral surface of the recess to drive the reversing spring; The upper plate and the push button are press-fitted into the recess of the body to create a double seal structure, making it even more waterproof and dustproof. In addition, by constantly holding the outer periphery of the reversing spring between the push button and the switch terminal, the contact stability between the reversing spring and the switch terminal can be increased, and the contact reliability can be improved. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a switch block according to an embodiment of the present invention.

FIG. 2(a) is a plan view of the switch block. (b) is a sectional view of the switch block.

FIG. 3 is a cross-sectional view of an LED block.

FIG. 4 is an exploded view of the whole.

FIG. 5 is an overall sectional view.

FIG. 6 is a cutaway perspective view of the push button.

FIG. 7 is a perspective view of the switch block.

FIG. 8 is a cross-sectional view of the LED block.

FIG. 9 is a sectional view of the mounting frame.

FIG. 10 is a sectional view showing how it is attached to a panel.

FIG. 11 is a sectional view of a conventional example.

[Explanation of symbols]

1 Body 2 Recess 3b Switch terminal 5 Fixed contact 6 Movable contact 7 Push button 11 Top plate

Claims (1)

[Claims] [Claim 1] A switch mechanism unit that opens and closes a contact by reversing a dome-shaped reversing spring when a push button is pressed;
An illuminated pushbutton switch consists of an illuminated section that blinks a display element in response to the opening and closing of a contact, and includes a switch terminal disposed on the bottom of a recess in the body, a central section facing the fixed contact, and an outer peripheral section facing the switch terminal. a reversing spring in contact with the top surface; a flexible push button whose outer peripheral surface presses against the inner peripheral surface of the recess to drive the reversing spring; An illuminated pushbutton switch comprising: an upper plate which is press-fitted into a recess while sandwiching the outer periphery of the switch.