JPH065056U - Illuminated tact switch - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an illuminated tact switch that is thin and has a good appearance, reduces the number of parts to reduce the manufacturing cost, and has an excellent sealing property. [Configuration] LED 3 and fixed contacts 6a and 6b on the base 1
And a dome-shaped translucent film click plate 7 and a seal rubber 9 for keeping the inside of the click plate airtight. Further, inside the film click plate 7, there is provided a movable contact 8 which makes electrical contact with the fixed contacts 6a and 6b when the film click plate is pressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an illuminated tact switch, more specifically to a signal input switch, and more particularly to a surface mount type illuminated tact switch.

[0002]

[Prior art]

 As shown in FIG. 3, a typical conventional illuminated tact switch has an LED 53 in a base 51 and a fixed contact 54, and a dome-shaped contact above the fixed contact 54. 55 (hereinafter referred to as "dome contact") is provided. Since this conventional dome contact 55 is made of a metal material, holes 55a and 55b are formed at positions corresponding to the LEDs 53 of the dome contact 55 in order to emit the light emitted from the LED upwards (shown in the figure. In this case, since two LEDs 53 are provided, two holes are formed).

A pusher 57 is placed on the surface side of the dome contact 55, and a cover 58 for pressing the pusher 57 is further provided on the pusher 57.

[0004]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional illuminated tact switch, since the LED 53, the dome contact 55, the pusher 57 and the like are arranged on the base 51, not only the height of the switch is increased, but also It had the drawback of increasing the number of parts and increasing the manufacturing cost.

Further, the pusher 57 placed on the dome contact 55 is only pressed down by the cover, and the sealing property is poor, and the switch part cannot be washed.

[0006] Therefore, the technical problem of the present invention is to provide an illuminated tact switch which is thin and has a good appearance, reduces the number of parts to reduce the manufacturing cost, and has an excellent sealing property. .

[0007]

[Means for Solving the Problems]

 The present invention relates to an illumination type tact switch having a plurality of LEDs, a plurality of fixed contacts, and a movable contact for electrically connecting or disconnecting the plurality of fixed contacts on a base. And a dome-shaped translucent film click plate surrounding the fixed contact and connected to the base, and a sealing means for maintaining an airtight state defined by the translucent film click plate. The illuminated tact switch is characterized in that a movable contact is provided on an inner surface of the translucent film click plate.

[0008]

[Action]

 In the present invention, since the movable contact is provided inside the translucent film click plate, the pusher for pressing the metal click plate and the cover for holding it are not required as in the conventional case. That is, the transparent film click plate has both a switch function and an illumination function.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing a basic embodiment of the present invention. (A) is a plan view, (b) is a sectional view taken along the line II of (a), and (c) is the line II- of (a). It is a II sectional view. As shown in FIGS. 1 (a), 1 (b), and 1 (c), two LEDs 3 connected to lead wires (not shown) are arranged on the base 1 at symmetrical positions with a predetermined interval. Fixed contacts 6a and 6b connected to a lead (not shown) are arranged.

Above the LED 3 and the fixed contacts 6a, 6b, a film click plate 7 made of a light-transmissive material having a dome-shaped portion for covering the LED 3 and the fixed contacts 6a, 6b is provided. On the inside of the dome of the film click plate 7, a strip-shaped movable contact 8 for electrically connecting the fixed contacts 6a and 6b is provided along the inside of the dome. A seal rubber 9 is attached to the upper side of the film click plate 7 so as to expose only the dome portion.

It is to be noted that, in the film click plate 7, if at least the outer side of the dome portion is preferably embossed, it is possible to give an operator a feeling of operating the switch.

Next, a specific embodiment of the present invention will be described.

FIG. 2 is an explanatory view showing a concrete embodiment of the present invention. (A) is a plan view, (b) is a sectional view taken along line III-III of (a), and (c) is taken along line IV- of (a). IV cross section, (d) is a wiring diagram of the LED and contacts, and each terminal of ABCDEF corresponds to the terminal ABCDEF in (a). As shown in FIGS. 2 (a), 2 (b), 2 (c) and 2 (d), the base 11 is composed of a bottom surface portion 11a and a side wall portion 11b protruding above the bottom surface portion. The lead frame of the LED 13 and the fixed contacts 16a, 16b is insert-molded on the bottom surface 11a of the base 11. Two LEDs 13 are mounted on the bottom surface 11a of the base 11 at symmetrical positions.

A dome-shaped film click plate 17 is provided so as to cover the LEDs 13 and the fixed contacts 16a and 16b. The film click plate 17 is made of a transparent material such as transparent.

A seal rubber 19 is provided around the film click plate 17, and the internal space defined by the film click plate 17 and the base 11 is hermetically sealed by heat caulking. In the figure, 20 is a thermal crimping portion.

A strip-shaped movable contact 18 is provided inside the film click plate 17 so as to pass from the symmetrical position on the edge side of the click plate 17 to the central portion. The movable contact 18 is always in contact with one fixed contact 16b and is opposed to the other fixed contact 16a at a distance. When the click plate 17 is pushed down, the click plate 17 is inverted, the movable contact 18 contacts the fixed contact 16a, and the fixed contacts 16a and 16b are electrically connected. Then, when the external force is made zero, the film click plate 17 returns to the original position (to the state shown in the drawing), and the movable contact 18 separates from the fixed contact 16a.

In the drawing, the shapes of the terminals A to F of the LED 13 and the fixed contacts 16a and 16b correspond to the surface mounting, but it goes without saying that the shape is not limited to this. Further, FIG. 2D shows an example of the wiring of the LED 13 and the fixed contacts 16a and 16b in this embodiment, and the LED 13 is always irrespective of the presence or absence of conduction between the fixed contacts 16a and 16b. It emits light, and light emission is controlled by another control circuit.

In the above description, two LEDs are provided, but the number of LEDs is not limited to this, and one LED may be provided or three or more LEDs may be provided.

[0020]

[Effect of device]

 As described above, in the illuminated tact switch of the present invention, the film click plate is used instead of the dome contact made of a metal material, so that the switch can be made thinner and the number of parts can be reduced. Cost can be reduced.

Moreover, in the illuminated tact switch of the present invention, since the joint portion of the film click plate to the base is sealed by the sealing means, it is possible to wash with water or the like.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a basic embodiment of the present invention, (a)
Is a plan view, (b) is an II sectional view, and (c) is an II-II sectional view.

FIG. 2 is an explanatory view showing a concrete embodiment of the present invention, (a)
Is a plan view, (b) is a III-III sectional view, (c) is an IV-IV sectional view, and (d) is a wiring diagram of an LED and a contact.

3A and 3B are explanatory views showing an example of a conventional illuminated tact switch, in which FIG. 3A is a plan view and FIG. 3B is a sectional view taken along line VV.

[Explanation of symbols]

 1, 11, 51 Base 3, 13, 53 LED 6a, 6b Fixed contact 7, 17 Film click plate Film click plate 8, 18, 55 Moving contact 9, 19 Seal rubber 16a, 16b, 54, 56 ... Fixed contact 57 Pusher 58 cover

Claims (1)

[Scope of utility model registration request] 1. An illuminated tact switch having a plurality of LEDs, a plurality of fixed contacts, and a movable contact for electrically connecting or disconnecting the plurality of fixed contacts on a base. And a dome-shaped translucent film click plate surrounding the fixed contact and connected to the base, and a sealing means for maintaining the interior defined by the translucent film click plate in an airtight state, An illuminated tact switch, wherein a movable contact is provided on the inner surface of the translucent film click plate.