KR20060041189A - Key panel lamp switch - Google Patents

Abstract

The present invention relates to a key panel lamp switch. The key panel lamp switch according to the present invention includes a lower panel having a lower panel portion and a lower circuit portion stacked on the upper surface of the lower panel portion by a printing process and having a plurality of fixed contacts formed thereon, and stacked on the lower panel. An intermediate panel having a hole formed at each position corresponding to the fixed contact, and stacked on the intermediate panel, laminated at the upper panel portion and a lower surface of the upper panel portion by printing processing, and having a movable contact formed at each position corresponding to the plurality of fixed contacts. An upper panel provided with an upper circuit portion, an EL sheet laminated on the upper surface of the upper panel by a printing process, and emitting light upon application of power, a projection provided on the EL sheet and pressing the plurality of movable contacts, A protruding pad provided with an elastic support part which is elastically supported when pressed, and installed on the protruding pad, Characterized in that the key panel is provided with a key for each position corresponding to the plurality of projections.

Key, panel, lamp, switch, EL

Description

Key Panel Lamp Switch {Key Panel Lamp Switch}

1 is a cross-sectional view of a conventional general key panel lamp switch,

2 is a sectional view of a first embodiment of a key panel lamp switch according to the present invention;

3 is an exploded perspective view of the upper panel, the middle panel, and the lower panel of FIG.

4 is a sectional view of a second embodiment of a key panel lamp switch according to the present invention;

Explanation of symbols on the main parts of the drawings

210, 410: key panel 212, 412: key

220, 450: projection pads 222, 452: projections

224, 454: elastic support 230, 420, 440, 460: bonded

240, 430: EL sheet 250, 470: top panel

252, 472: upper panel portion 254, 474: upper circuit portion

254-1, 474-1: Movable contacts 260, 480: Middle panel

262, 482: holes 270, 490: lower panel

272, 492: lower circuit section 272-1, 492-1: fixed contact

274, 494: lower panel

TECHNICAL FIELD The present invention relates to a key panel lamp switch, and more particularly, to a key panel lamp switch in which EL lamps are applied and the switching function is improved.

In general, a key panel lamp switch is a switch device for signal generation used in a communication device such as a mobile phone, and when used in a dark place, a lamp provided to illuminate a key printed with numerals or letters.

1 is a cross-sectional view of a conventional general key panel lamp switch, which includes a key panel 110, a protruding pad 120, a top tape 130, a base tape 140, a metal dome 150, an LED 160, and It consists of a printed circuit board 170.

Here, the LED 160 is typically mounted by soldering to the formed pattern of the surface of the printed circuit board 170 by applying a surface mount technology (SMT: Surface Mount Technology). In addition, since the printed circuit board 170 must be designed in a minimum size to be disposed in a limited space, the printed circuit board 170 is manufactured in a multilayer structure such as 8 layers or 10 layers. In addition, the fixed contact terminal 172 of the printed circuit board 170 is thinly coated (plated) with a material such as gold to prevent corrosion of the terminal surface and improve contact resistance.

Looking at the operation principle of the switch, when the user presses the predetermined key 112 of the key panel 110, the predetermined protrusion 122 of the projection pad 120 is pressed by the projection 122, the predetermined metal dome 150 The deformed contact with the predetermined fixed contact terminal 172 of the printed circuit board 170 is switched to generate a predetermined key signal.

However, such a key panel lamp switch may cause the following problems. That is, due to the characteristics of the LED 160, the light emitted is not uniformly irradiated to the entire key panel 110, and when a predetermined deviation occurs when fabricating the assembly state by assembling each component, the key When the predetermined key 112 of the panel 110 is pressed, there is a problem in that the normal switching does not occur.

In addition, when used for a long time, defects may occur due to the characteristics of the metal dome 150, and the fixed contact terminal 172 of the plated printed circuit board 170 may be deformed due to foreign substances such as fingerprints. The process requires considerable attention. In addition, since two layers are used in the multilayered printed circuit board 170 to process the fixed contact terminal 172 divided into + and-, the remaining layers design the component layout and the pattern of the main circuit. Difficulties will follow.

Accordingly, an object of the present invention is to provide a key panel lamp switch capable of improving the reliability of a product by improving the switching function and work process as well as irradiating light uniformly. .

In order to achieve the above object, a key panel lamp switch according to the present invention comprises: a lower panel including a lower panel portion and a lower circuit portion stacked on the upper surface of the lower panel portion by a printing process and having a plurality of fixed contacts; An intermediate panel stacked on the lower panel and having holes formed at positions corresponding to the plurality of fixed contacts; An upper panel laminated on the intermediate panel, and having an upper circuit portion laminated on the lower surface of the upper panel portion and the upper panel portion by a printing process and having movable contacts formed at positions corresponding to the plurality of fixed contacts; An EL sheet laminated on the upper surface of the upper panel by a printing process and emitting light upon application of power; A projection pad provided on the EL sheet and provided with a projection for pressing the plurality of movable contacts and an elastic support portion for elastically supporting the projection when the projection is pressed; It is installed on the projection pad, characterized in that consisting of a key panel provided with a key for each position corresponding to the plurality of projections.

In addition, in order to achieve the above object, the key panel lamp switch according to the present invention, the lower panel and the lower panel is provided with a lower circuit portion laminated with a printing process on the upper surface of the lower panel portion and formed with a plurality of fixed contacts; An intermediate panel stacked on the lower panel and having holes formed at positions corresponding to the plurality of fixed contacts; An upper panel laminated on the intermediate panel, and having an upper circuit portion laminated on the lower surface of the upper panel portion and the upper panel portion by a printing process and having movable contacts formed at positions corresponding to the plurality of fixed contacts; A projection pad provided on the upper panel and provided with a projection for pressing the plurality of movable contacts and an elastic support portion to elastically support the projection when the projection is pressed; An EL sheet laminated on the protruding pad and emitting light upon application of power; And a key panel provided on the EL sheet and provided with a key for each position corresponding to the plurality of projections.

It is more preferable that the key panel lamp switch to block electromagnetic interference by stacking an Electro-Magnetic Interference (EMI) layer on the upper surface of the EL sheet by a printing process.

The key panel lamp switch may include a reinforcing plate having a flat function and an insulation function under the lower panel.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

FIG. 2 is a cross-sectional view of a first embodiment of a key panel lamp switch according to the present invention, and FIG. 3 is an exploded perspective view of the upper panel, the middle panel, and the lower panel of FIG.

As shown in FIG. 2, the key panel lamp switch includes a key panel 210, a protrusion pad 220, a joint 230, an EL sheet 240, an upper panel 250, an intermediate panel 260, and The lower panel 270.

Referring to FIG. 2, the key panel 210 is typically made of a material such as plastic. The key panel 210 includes a plurality of keys 212 in which predetermined numbers or letters are formed by printing or cutting.

The protrusion pad 220 is made of a material such as silicone rubber or synthetic resin, and an elastic support part elastically supporting the protrusion 222 and the protrusion 222 corresponding to the plurality of keys 212 when the protrusion 222 is pressed. 224.

Therefore, when a user presses a predetermined key 212 of the key panel 210 with a finger and clicks the predetermined protrusion 222 of the protrusion pad 220, the user presses the predetermined protrusion 222. By being sexually supported, a predetermined click feeling can be felt.

In addition, when the user releases a finger from the predetermined key 212 of the key panel 210, the predetermined protrusion 222 of the protrusion pad 220 returns to its original state by the action of the elastic support 224. The protrusion pad 220 may be attached to the key panel 210 by a double-sided adhesive tape, a bond, and ultrasonic welding.

The EL sheet 240 has a structure in which a light emitting electrode layer, a dielectric layer, a light emitting layer, and a transparent electrode film layer are stacked, and when power is applied, the light emitting layer emits light to illuminate the key panel 210 positioned upward. Since the laminated structure of the EL sheet 240 is a well known technique, a detailed description thereof will be omitted. The protruding pad 220 and the EL sheet 240 can be adhesively fixed to a predetermined portion by the bonding material 230.

More preferably, the electromagnetic interference shielding layer is further laminated on the upper surface of the EL sheet 240 to be laminated. Then, it is possible to effectively block the electrostatic discharge (ESD) or radiation that may affect the EL sheet 240.

2 and 3, the upper panel 250 includes the upper panel portion 252 and an upper circuit portion 254 in which movable contacts 254-1 are formed at positions corresponding to the plurality of protrusions 222. do. Here, the upper circuit portion 254 is adhered to the lower surface of the upper panel portion 252 by a printing process.

The intermediate panel 260 is positioned below the upper panel 250, and a hole 262 is formed at each position corresponding to the plurality of movable contacts 254-1. Herein, the diameter of the hole 262 may be set to about the diameter of the protrusion pad 220 and the elastic support 224.

The lower panel 270 includes a lower panel portion 274 and a lower circuit portion 272 having fixed contacts 272-1 formed at positions corresponding to the plurality of movable contacts 254-1. Here, the lower circuit portion 272 is bonded to the upper surface of the lower panel portion 274 by a printing process. The fixed contact 272-1 of the lower circuit portion 272 has opposite polarities as compared to the movable contact 254-1 of the upper circuit portion 254.

As described above, the key panel lamp switch includes the upper panel 250 formed by stacking the upper circuit unit 254 on the upper panel unit 252 by printing processing, and the lower circuit unit 272 on the lower panel unit 274. It is manufactured in the form of a package such as a lower panel 270 formed by lamination by a print process.

Here, the upper panel 250, the middle panel 260, and the lower panel 270 may be simply laminated without using a separate joint, or a joint such as a double-sided adhesive tape may be bonded to each other. have. In addition, a predetermined connection terminal (not shown) is formed in the upper circuit unit 254 and the lower circuit unit 272, and may be connected to a main printed circuit board (FPC) by using an FPC cable.

At this time, the connection terminal and the cable terminal formed in the circuit unit 254, 272 may be connected in various forms. For example, after the cable is inserted into a predetermined groove (not shown) formed in the intermediate panel 260, a hot press process is performed to connect the connection terminal and the cable terminal formed in the circuits 254 and 272 to each other and to be connected or double-sided. It can be adhesively fixed and connected by a joint such as a tape.

In addition, the connection terminals of the circuit units 254 and 272 are connected to a predetermined connection terminal (not shown) formed in the intermediate panel 260, and other predetermined connection terminals formed in a portion protruding to the outside of the intermediate panel 260. Cable terminals may be connected to and connected to a predetermined connector (not shown).

On the other hand, the lower panel 270 to maintain the shape of the lower panel 270 as it is and to prevent electricity from flowing between the lower panel 270 and the main printed circuit board located below the lower panel 270. It is more preferable to provide a reinforcement plate (not shown) further. Here, the reinforcing plate may be attached to the lower panel 270 by a bonding material such as a double-sided adhesive tape or a hot press process.

Now, referring to the operation principle of the key panel lamp switch as described above, when the user presses a predetermined key 212 of the key panel 210 with a finger, the predetermined protrusion 222 of the protrusion pad 220 is pressed. The upper panel 250 is pressed through the EL sheet 240 to apply pressure to the predetermined movable contact 254-1 of the upper circuit portion 254.

Then, the predetermined movable contact 254-1 of the upper circuit portion 254 under pressure passes through the predetermined hole 262 formed in the intermediate panel 260, and the corresponding predetermined fixed contact 272 of the lower circuit portion 272. Contact with -1). That is, the predetermined movable contact 254-1 of the upper circuit portion 254 and the predetermined fixed contact 272-1 of the lower circuit portion 272 are brought into contact with each other so as to be conductive, thereby switching from the off state to the on state.

When the user releases his / her finger from the predetermined key 212 of the key panel 210, the protrusion 222 of the protrusion pad 220 returns to its original state by the action of the elastic support 224, so that the upper circuit portion ( The contact between the predetermined movable contact 254-1 of 254 and the predetermined fixed contact 272-1 of the lower circuit portion 272 falls. That is, the predetermined movable contact 254-1 of the upper circuit unit 254 and the predetermined fixed contact 272-1 of the lower circuit unit 272 are shorted to switch from the on state to the off state.

4 is a cross-sectional view of a second embodiment of a key panel lamp switch according to the present invention, in which the key panel lamp switch shown in FIG. 2 is modified, and the key panel 410, the joints 420, 440, 460, and the EL sheet 430 , The protrusion pad 450, the upper panel 470, the middle panel 480, and the lower panel 490.

The key panel lamp switch shown in FIG. 4 is compared with the key panel lamp switch shown in FIG. 2, where the EL sheet 430 is located directly under the key panel 410, and the projection pad 450 is an EL sheet. 430 is located directly below. Here, the key panel 410 and the EL sheet 430, the EL sheet 430, and the protruding pad 450 are adhesively fixed by separate bonding materials 420 and 440, respectively. On the upper surface of the EL sheet 430, an electromagnetic interference shielding layer may be additionally laminated to effectively block electrostatic discharge or radiation.

Meanwhile, the upper panel 470, the middle panel 480, and the lower panel 490 are stacked in the same order to perform a switching function. Since the basic operating principle of the key panel lamp switch shown in FIG. 4 is the same as the operating principle of the key panel lamp switch shown in FIG. 2, a detailed description thereof will be omitted.

As described so far, according to the present invention, by using EL lamp as the light emitting source, it is possible to miniaturize the product and the light emitted can be uniformly irradiated to the key panel. In addition, by using a panel in the form of a package, it is possible to improve the switching function by minimizing the deviation generated during the assembly process, and to improve the reliability of the product by reducing the defective rate by improving the work process.

In addition, by stacking the electromagnetic interference shielding layer, it is possible to minimize the effects of electrostatic discharge or radiation, thereby improving the reliability of the product. In addition, by treating the contact terminals in the circuit printed layer, the pattern design of the main circuit is relatively easy, and the cost can be reduced by the reduced layer of the printed circuit board.

Claims (4)

A lower panel including a lower panel portion and a lower circuit portion stacked on the upper surface of the lower panel portion by a printing process and having a plurality of fixed contacts formed thereon; An intermediate panel stacked on the lower panel and having holes formed at positions corresponding to the plurality of fixed contacts; An upper panel laminated on the intermediate panel, and having an upper circuit portion laminated on the lower surface of the upper panel portion and the upper panel portion by a printing process and having movable contacts formed at positions corresponding to the plurality of fixed contacts; An EL sheet laminated on the upper surface of the upper panel by a printing process and emitting light upon application of power; A projection pad provided on the EL sheet and provided with a projection for pressing the plurality of movable contacts and an elastic support portion for elastically supporting the projection when the projection is pressed; The key panel lamp switch of the present invention, comprising: a key panel provided on the protruding pad and provided with a key for each position corresponding to the plurality of protrusions. A lower panel including a lower panel portion and a lower circuit portion stacked on the upper surface of the lower panel portion by a printing process and having a plurality of fixed contacts formed thereon; An intermediate panel stacked on the lower panel and having holes formed at positions corresponding to the plurality of fixed contacts; An upper panel laminated on the intermediate panel, and having an upper circuit portion laminated on the lower surface of the upper panel portion and the upper panel portion by a printing process and having movable contacts formed at positions corresponding to the plurality of fixed contacts; A projection pad provided on the upper panel and provided with a projection for pressing the plurality of movable contacts and an elastic support portion for elastically supporting the projection when the projection is pressed; An EL sheet laminated on the protruding pad and emitting light upon application of power; A key panel lamp switch provided on the EL sheet and comprising a key panel provided with a key for each position corresponding to the plurality of projections. The method according to claim 1 or 2, A key panel lamp switch, wherein an electromagnetic interference shielding layer is laminated on the upper surface of the EL sheet by a printing process. The method according to claim 1 or 2, Key panel lamp switch, characterized in that the reinforcement plate with a flat function and an insulating function is further installed below the lower panel.

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