JPH0729727U - Light guide structure of pushbutton in illuminated pushbutton switch - Google Patents

Abstract

(57) [Abstract] [Purpose] A push button that can be used by a simple mounting means so that the main part of the button and the light guide member can be stably fixed so that no gap is created on the top surface part. It is to provide a light guide structure at low cost. [Structure] The light guide member 25 is integrally provided with leg pieces 25b, 25b substantially parallel to the light guide piece 25a, and the light guide piece 25a and the leg pieces 25b, 25b form a clip utilizing its own elasticity. At the same time, the tip of the light guide piece 25a and the leg pieces 25b, 25b of the clip are arranged so that the tip edge of the light guide piece 25a is pressed against the edge of the button body 13. The light guide member 25 is provided with a tongue piece 25c attached to the bottom surface of the button main portion 13 so that the attachment portion 28 is attached in a sandwiched state.
It is characterized in that it was made to contact the 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a push button structure in an illuminated push button switch, and more particularly to a light guide portion structure of a push button of a type in which a separate light guide member is assembled and attached to a button main portion. Is.

[0002]

[Prior art]

 As a conventional light guide section structure of this type, as shown in FIGS. 5 and 6, for example, a notch 2 in a penetrating state is formed in one side portion of a plastic button main section 1 from the top surface to the inside. The light guide member 3 is fixed to the cutout portion 2. For fixing the light guide member 3, rivets 4 and 4 are integrally provided on the button main portion 1, and the light guide member 3 is fixed to the rivets 4 and 4. Corresponding rivet holes 5 and 5 are formed, and the light guide member 3 is attached to the button main portion 1 so that the rivets 4 and 4 are inserted into the rivet holes 5 and 5. The tips of 4, 4 are crushed while being heated so that they are fixed by so-called heat welding.

[0003]

[Problems to be solved by the device]

 Since the above-mentioned conventional technique fixes the both by heat welding, not only does it require special equipment and time for the heat welding process, resulting in an increase in cost, but also the fixing of the plastic rivet by heat welding is not necessary. In many cases, the adhesion force is insufficient, and there is a serious defect that a gap is easily formed at the contact portion between the two at the top of the button.

Therefore, an object of the present invention is to use the main body of the button and the light guide member in a stable state so as not to create a gap at the top surface portion by a simple mounting means without using a heat welding means. It is to provide a light guide structure of a push button that can be manufactured at low cost.

[0005]

According to the present invention, a light guide member is integrally provided with a leg piece that is substantially parallel to a light guide piece which is a main part of the light guide member, and the elasticity of the light guide piece and the leg piece itself increases. The clip is made by using the clip, and is attached so that the mounting part of the button main part is sandwiched between the tip parts of the light guide piece and the leg piece, so that the tip edge of the light guide part that touches the button main part is The tongue piece is attached to the edge of the main part so that it can be clamped in a tilted manner, and the light guide member has a tongue that is in contact with the bottom surface of the button main part. It is characterized by making them contact each other.

[0006]

[Action]

 Due to the elasticity of the clip formed by the light guide piece and the leg piece, the button main part and the light guide member remain elastically coupled, and the pressure contact state is maintained without a gap between them on the surface part. The tongue provided on the member is constantly pressed against the main part of the button by the push-up action of the passive part of the switch, so the light guide member is stably fixed to the main part of the button, and the tendency to separate from the main part of the button is reliably prevented. To be done.

[0007]

【Example】

 Hereinafter, the light guide structure of the push button according to the present invention will be described in detail with reference to the embodiments shown in FIGS.

As a push button switch to which the light guide structure of the present invention is applied, for example, as shown in FIGS. 1 and 2, in addition to forming a rectangular button hole 12 in a vessel frame wall body 11, In the hole 12, there are projecting pieces 14, 14 for preventing the button main portion 13 from slipping off at the bottom peripheral edge thereof. A push button 15 having a substantially rectangular parallelepiped shape is provided with the top of the button main portion 13 appropriately protruding from the button hole 12. The push button 15 is loosely fitted so as to be able to move forward and backward, and the lower end of the push button 15 is used as a drive part. The switch 16 for the push button 15 is elastic by pushing the push button 15. A rubber sheet 19 having a dome-shaped passive portion 17 that is deformed into a shape, a movable contact 18 provided on the top of the inner surface of the passive portion 17, and fixed contacts 20 and 20 at positions facing the movable contact 18. With the printed board 21 formed, the push button is pushed by the spring action of the passive section 17 under the condition that the dome-shaped passive section 17 of the rubber sheet 19 corresponds to the driving section of the push button 15. It is possible to press the movable contact 18 against the fixed contacts 20 and 20 against the repulsive force of the passive portion 17 by pushing the push button 15 while keeping 15 in a state where it is easy to move outward. Adopt the so-called rubber contact type.

As an indicator light, as shown in FIGS. 1 and 2, for example, an indicator light 22 such as a light emitting diode is provided on the printed circuit board 21 in the vicinity of the fixed contacts 20, 20, and the rubber shield is used. In addition to forming the dome-shaped protrusion 23 on the seat 19 so as to cover the indicator light 22, the rubber sheet 19 is made of a transparent material, and one side portion of the push button 15 corresponds to the indicator light 22. A notched portion 24 is formed in a penetrating state from the top surface to the inside at a position where the light guide member 25 is fixed to the notched portion 24, and the light of the indicator lamp 22 is emitted to the front portion through the light guide member 25. Adopt the model that

As a special structure of the present invention for the above type, as shown in FIGS. 1 and 2, for example, as shown in FIGS. 1 and 2, a light guide piece 25a fitted in the cutout portion 24 in the button main body 13 and a light guide piece 25a In addition to forming a clip with the leg pieces 25b and 25b that extend in a substantially parallel state on both sides and have an approximately E shape, a tongue piece 25c that extends substantially at a right angle from the base of the light guide piece 25a and the leg pieces 25b and 25b is formed. The light guide member 25 provided is made of transparent plastic, and the button main portion 13 for the light guide member 25 is provided with inner cavity portions 26, 26 capable of receiving the leg pieces 25b, 25b of the light guide member 25. Under the condition, inclined receiving parts 27, 27 are provided on the inner surface thereof so that the outer end portions of the leg pieces 25b, 25b are pressed against each other in a tensioned state. A bent plate-shaped mounting portion 28 is constituted by the cutout portion 24.

Based on the above configuration, after the light guide member 25 is opposed to the button main portion 13 as shown in FIG. 4, the mounting portion 28 of the button main portion 13 is guided as shown in FIGS. 1 to 3. The light piece 25a and the leg pieces 25b, 25b are fitted together in a state of being sandwiched, whereby the mounting portion 28 in the button main portion 13 is clipped by the light guide piece 25a and the leg pieces 25b, 25b. As shown by the arrows in FIG. 2, the legs 25b and 25b are clamped in a zigzag relationship, and the tips of the legs 25b and 25b are in pressure contact with the inclined receiving portions 27 and 27. Inevitably, the tongue piece 25c of the light guide member 25 forms the bottom portion of the push button 15 and is always in contact with the dome-shaped passive portion 17 because the tongue piece 25c of the light guide member 25 is always attached to the notch portion 24 so as to maintain a close contact. Upper, button main part 13 and light guide member 25 The fitted state with is stably maintained.

The shape of the button hole 12 and the push button 15 of the present invention is not limited to the rectangle as in the above embodiment, but may be other shapes such as square, circle, ellipse, triangle, and variant. Is.

[0013]

[Effect of device]

 As described above, according to the present invention, the light guide member, which is a clip composed of the light guide piece and the leg pieces parallel to the light guide piece, is connected to the attachment portion of the main part of the button to guide the light to the tip of the leg piece. Since the tip of the piece is fitted and mounted so as to sandwich the mounting part, the light guide piece and the notch of the button main part can always be kept in close contact with each other. There are no gaps in the contact area, the appearance is good, dust and the like do not enter the gaps and are not contaminated, and the light guide member and the tongue piece that is almost perpendicular to the light guide piece are provided. Since it is attached to the bottom of the button main part, the light guide member is constantly pressed against the button main part by the push-up action of the passive part of the switch. It is always stably fixed to the button, and the tendency to separate from the main part of the button is reliably prevented. There is a result.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of an illuminated pushbutton switch equipped with a light guide structure of a pushbutton according to the present invention.

FIG. 2 is a partially cutaway plan view of a push button switch.

FIG. 3 is a vertical sectional side view of only a push button.

FIG. 4 is an exploded perspective view of only push buttons.

FIG. 5 is an exploded perspective view of a conventional push button.

FIG. 6 is a front view of a conventional push button in use.

[Explanation of symbols]

 15 push button 17 passive part 18 movable contact 20 fixed contact 21 printed circuit board 24 contact part 25 light guide member 25a light guide piece 25b leg piece 25c tongue piece 26 inner cavity 27 receiving part 28 mounting part

Claims (1)

[Scope of utility model registration request] 1. A movable contact (1) is attached to a passive portion (17) which is elastically deformed by a pushing operation with respect to a push button (15).
8), a printed circuit board (21) having fixed contacts (20), (20) is provided at a position facing the movable contact (18), and the passive portion (17) is pushed by a push button (1).
Under the condition that it corresponds to the bottom of 5), the passive part (17)
The spring action of the push button (15) keeps the push button (15) always in a position where it can easily move outward, and the push button (15) is pushed in against the elastic force of the passive portion (17) to move the movable contact (1).
8) so that the fixed contacts (20), (20) can be pressed against each other, and the push button (15) is formed with a notch (24) penetrating inward from the top at one side thereof. The light guide member (25) is attached to the notch (24), and the printed circuit board (2) corresponding to the light guide member (25) is attached.
1) In an illuminated pushbutton switch of a type having an indicator light (22) provided above, a light guide piece (25a) corresponding to the cutout portion (24) of the pushbutton (15) and the light guide piece (25a). ) To the legs (2
5b) and (25b), and these light guide pieces (25a)
And the leg pieces (25b), (25b) form a clip, and the light guide piece (25a) and the leg pieces (25b), (2
5b) is provided with a tongue piece (25c) extending substantially at a right angle, and a button main portion (13) for the tongue piece (25c) is provided to receive the leg pieces (25b) and (25b) of the light guide member (25). With the cavity (26), (26) formed, the leg pieces (25b), (25
b) are provided with receiving portions (27) and (27) which are brought into pressure contact with the outer side portion of the tip, and these receiving portions (26) and (26) and the cutout portion (2
4) and the light guide part (2)
5a) and the leg pieces (25b), (25b) are inserted into the mounting portion (28) with the clip, the light guide member (25) is fitted to the button main portion (13), and the tongue piece (25) is attached. 25c) is attached to the bottom of the button main part (13) so as to be in contact with the passive part (17), the light guide part structure of the push button in the illuminated push button switch.