KR100851658B1 - The metal dome sheet having a wave guide sheet - Google Patents

Abstract

The metal dome sheet having a wave guide sheet according to an embodiment of the present invention is installed on the base sheet and the base sheet on which the metal dome is installed to fix the metal dome, and transmits the light of the light source to the keypad installed on the upper portion. It includes a wave guide sheet.

And a metal dome sheet having a wave guide sheet according to another embodiment of the present invention is a base sheet on which the metal dome is installed and the multi-layer laminated on the base sheet to fix the metal dome, the light source is installed on the keypad It includes multiple waveguides that each transmit to

Metal Dome, Metal Dome Sheet, Waveguide, Thinning

Description

Metal dome sheet with wave guide sheet {THE METAL DOME SHEET HAVING A WAVE GUIDE SHEET}

1 is a cross-sectional view showing a conventional key panel.

2 is a cross-sectional view of a key panel provided with a metal dome sheet provided with a wave guide sheet according to an embodiment of the present invention.

Figure 3 is a cross-sectional view showing that the electromagnetic wave blocking layer applied to the waveguide in one embodiment of the present invention.

Figure 4 is a perspective view showing a light input of the wave guide sheet according to an embodiment of the present invention.

5a to 5b are plan views showing the exit portion of the wave guide sheet according to an embodiment of the present invention.

6 is a cross-sectional view of a key panel in which a metal dome sheet having a wave guide sheet is installed according to another embodiment of the present invention.

7 is a cross-sectional view showing that an electromagnetic wave shielding layer is applied to a waveguide according to another embodiment of the present invention.

8A to 8B are perspective views illustrating a light input unit of the waveguide according to another embodiment of the present invention.

9A to 9B are plan views embodying an exit portion of the waveguide according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

100: key panel 10: printed circuit board

11: baseframe 12: conductive layer

13: fixed contact point 14: light source

20: metal dome sheet 21: metal dome

22: base sheet 22: mounting hole

23: waveguide 23a: light input unit

23b: exit section 23c: color filter

30: keypad 40: electromagnetic shielding layer

50: multi-waveguide 51, 52, 53: first, second, third waveguide

51a, 52a, 53a: light input part 51b, 52b, 53b: first, second, and third output parts

The present invention relates to a metal dome sheet having a wave guide sheet, and more particularly, to simplify and reduce the configuration of the light source to be transmitted to the keypad installed on the top while switching the fixed contact is installed on the bottom. The present invention relates to a metal dome sheet having a wave guide sheet.

In recent years, the development of the industry and the development of technology have required multi-functionality, high integration, miniaturization, thinness, and light weight. Therefore, such mobile phones, PDAs, DMB, PMP, notebooks, etc. that are released for this reason is more so.

Therefore, a key panel is provided in portable electronic devices to be miniaturized, thinned, and light. Here, the key panel is described with reference to FIG. 1, which shows a conventional key panel. As shown in FIG. 1, the metal dome sheet 2 is coupled to the printed circuit board 1, and the waveguide sheet 4 and the keypad 3 are sequentially positioned on the upper portion of the metal dome sheet 2. The light of the light source 1a installed on the printed circuit board 1 is transmitted to the keypad 3 via the waveguide 4 to increase the brightness of the keypad 3.

Here, the printed circuit board 1 includes a plurality of conductive fixed contacts 1b, and the metal dome sheet 2 includes a plurality of metal domes 2a so as to contact the fixed contacts 1b, but the metal dome 2a. It is composed of a base sheet (2b) and a top sheet (2c) bonded to the base sheet (2b) to secure the metal dome (2a) to secure the.

In addition, the waveguide 4 is irradiated so that the keypad 3 provided thereon has a uniform brightness by vertically switching horizontal light by a light source provided on the printed circuit board 1.

However, the metal dome sheet 2 composed of the base sheet 2b and the top sheet 2c performs only a function of switching the stationary contact 1b, and the waveguide 3 transmits the light of the light source to the keypad 3. Each function must be installed because it performs the function of delivering. Therefore, there are many components of the key panel, which complicates the configuration, and there is a problem of meeting the demand of thinning according to the recent trend.

SUMMARY OF THE INVENTION The present invention has been made in view of the above necessity, and an object thereof is to provide a metal dome sheet having a wave guide sheet for simplifying a key panel and making it thinner.

Metal dome sheet having a wave guide sheet of the present invention according to an embodiment for achieving the above object is installed on the base sheet and the base sheet is a metal dome is fixed to the metal dome, the light of the light source It includes a wave guide sheet for transmitting to the keypad installed on the top.

Here, the waveguide is provided with a light input unit for allowing the light of the light source to be incident, the light input unit is provided with a color filter so that the keypad can be expressed in various colors, the color filter is the light input unit It is preferred that colors be printed or coated.

In addition, the waveguide may be provided with at least one light emitting unit so that the light of the light source may be switched to the keypad, and the light emitting unit may be provided as one selected from an emission hole or an emission groove.

In addition, the waveguide is preferably provided with an electromagnetic wave shielding layer to block the electromagnetic wave on the lower surface.

Metal dome sheet with a wave guide sheet of the present invention according to another embodiment for achieving the above object is a multi-layered on the base sheet and the base sheet is installed a metal dome to fix the metal dome, the light of the light source It includes a multi-waveguide sheet for transmitting to each of the keypad installed on the top.

Here, the multi-waveguide sheet is composed of first, second, third waveguide sheet, each of the first, second, second waveguide sheet is provided with a first, second, third light input unit for allowing the light of the light source to be incident. The first, second, and third light input parts are provided with color filters so that the keypad can be expressed in various colors, and the color filters are respectively printed or printed in the first, second, and third light input parts. It is preferred to be coated.

The first, second, and third waveguides are provided with first, second, and third output units, respectively, so that the light of the light source can be switched to the keypad. It is preferable to provide one.

In addition, the multi-waveguide sheet is preferably provided with an electromagnetic wave shielding layer to block the electromagnetic wave on the lower surface in contact with the base sheet.

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

In the following description of the present invention, the terms defined are defined in consideration of functions in the present invention, and should not be understood as a meaning of limiting the technical components of the present invention.

2 is a cross-sectional view of a key panel in which a metal dome sheet having a wave guide sheet is installed according to an embodiment of the present invention. 3 is a cross-sectional view showing an electromagnetic wave blocking layer applied to a wave guide sheet according to an embodiment of the present invention. In addition, Figure 4 is a perspective view showing the light input portion of the wave guide sheet according to an embodiment of the present invention, Figures 5a to 5b is a plan view showing an exit portion of the wave guide sheet according to an embodiment of the present invention.

Referring to FIGS. 2 to 5B, the metal dome sheet 20 of the present invention is installed in the key panel 100. The key panel 100 is provided with a metal dome sheet 20, and a printed circuit board 10 and a keypad 30 are provided below the metal dome sheet 20.

The metal dome sheet 20 includes a base sheet 22 provided so that at least one metal dome 21 may be installed, a metal dome 21 installed on the base sheet 22, and a metal dome 21. It comprises a wave guide sheet 23 for fixing the.

The metal dome sheet 20 is installed on a printed circuit board 10 having a plurality of fixed contacts 13 and a light source 14. In this case, the printed circuit board 10 includes a base frame 11 constituting the body and a conductive layer 12 provided on the base frame 11, and the fixed contact 13 is formed by the conductive layer 12. Is formed.

The base frame 11 may be provided as a printed circuit board (PCB) or may be provided as a flexible printed circuit (FPC). In this case, when the base frame 11 is a flexible printed circuit board, the base frame 11 is made of a thin polyimide film having excellent insulation, heat resistance, cold resistance, chemical resistance, and abrasion resistance.

In addition, the metal dome sheet 20 is bonded to the upper portion of the conductive layer 12 in correspondence with the base frame 11. The metal dome sheet 20 is excellent in insulation, heat resistance, cold resistance, chemical resistance and abrasion resistance, and is provided with a thin, flexible polyimide film.

In addition, the metal dome sheet 20 is fixed to the base frame 11 by an adhesive method using an acrylic or epoxy adhesive. At this time, the metal dome 21 is installed on the top of the fixed contact 13, respectively.

The base sheet 22 of the metal dome sheet 20 is provided with a plurality of installation holes 22a so that a plurality of metal domes 21 can be installed, and the waveguide 23 is installed thereon. The metal dome 21 installed in the hole 22a is fixed.

At this time, the metal dome 21 is fixed to the waveguide 23 by the method of adhesion. The waveguide 23 transmits the light of the light source 14 installed on the printed circuit board 10 to improve the brightness of the keypad 30. In this case, the brightness of the keypad 30 may be influenced by the brightness of the light source 14 installed on the printed circuit board 10, and the light source 14 is applied with a high brightness LED.

At this time, the light source 14 is positioned on one side of the waveguide 23 to emit light to the waveguide 23. In addition, the waveguide 23 is formed with a waveguide that serves as a movement path of light so as to transmit light generated from the light source 14 to the keypad 30.

In addition, the wave guide sheet 23 is provided in a flexible plate shape, and uses a material having a constant elasticity. A dome-shaped receiving groove may be provided so that the portion to which the metal dome 21 is bonded may accommodate the metal dome 21.

Meanwhile, as illustrated in FIG. 3, the metal dome sheet 20 is provided with an electromagnetic wave blocking layer 40 to block electromagnetic waves. The electromagnetic wave shielding layer 40 is provided between the waveguide 23 and the base sheet 22 in order to prevent the internal printed circuit board 10 and external electromagnetic waves from interfering with each other, and the waveguide 23 It is provided by applying or coating at the bottom of the).

In addition, as shown in FIG. 4, the light guide part 23a is provided with the light input part 23a so that the light of the light source 14 can be input, and the light input part 23a is formed of the wave guide sheet 23. It is prepared by cutting one side. In addition, the color input unit 23a is provided with a color filter 23c to implement various colors of the keypad 30 separately from the color of the light incident from the light source 14.

Here, the color filter 23c may print or coat a color on the light input unit 23a, and the light incident from the light source 14 may be transferred to the keypad 30 after the color is converted by the color filter 23c. To help.

In addition, the wave guide sheet 23 is provided with an emission unit 23b to improve the light guide rate of the light transmitted to the keypad 30. Here, the exit unit 23b may be provided in the form of an exit hole or an exit groove, and at least one exit hole is formed.

In this case, the exit hole may be a fine hole in which a plurality of minute holes are uniformly formed as shown in FIG. 5A, and may be a slit hole cut in a straight or curved shape as shown in FIG. 5B. And the exit groove may be provided by molding and may be provided by pressing at a predetermined pressure. In addition, the emission unit may be provided by inputting the reflective powder or impurities to the position to emit light.

Hereinafter, a metal dome sheet according to another embodiment of the present invention will be described with reference to FIGS. 6 to 9B. Here, the detailed description of the same configuration as the embodiment will be omitted.

6 is a cross-sectional view of a key panel provided with a metal dome sheet according to another embodiment of the present invention. 7 is a cross-sectional view showing that an electromagnetic wave blocking layer according to another embodiment of the present invention is applied to a waveguide sheet.

8A to 8B are perspective views illustrating a light input portion of the waveguide sheet according to another embodiment of the present invention. 9A to 9B are plan views illustrating the exit portion of the waveguide according to another embodiment of the present invention.

6 to 9B, the metal dome sheet 20 according to another embodiment of the present invention is installed in the key panel 100. Here, the key panel 100 includes a printed circuit board 10 and a keypad 30 on the bottom of the metal dome sheet 20.

The metal dome sheet 20 includes a base sheet 22 provided with an installation hole 22a to install at least one metal dome 21, a metal dome 21 installed in the base sheet 22, and It is configured to include a multi-waveguide sheet 50 for fixing the metal dome 21.

At this time, the metal dome 21 is fixed to the multi-waveguide sheet 50 by the adhesive method. In addition, the multi-waveguide 50 transmits the light of the light source 14 installed on the printed circuit board 10 to improve the brightness of the keypad 30. In this case, the brightness of the keypad 30 may be influenced by the brightness of the light source 14 installed on the printed circuit board 10, and the light source 14 is applied with a high brightness LED.

And the multi-waveguide sheet 50 is provided with a thin thickness, at least two or more are sequentially stacked. That is, in the multi-waveguide sheet 50, the first waveguide sheet 51, the second waveguide sheet 52, the third waveguide sheet 53, and the like are sequentially stacked in the order of contact with the base sheet 22.

Here, although the first waveguide 51, the second waveguide 52, and the third waveguide 53 are applied as an example, the present invention is not limited thereto, and the quantity may be changed as necessary. have.

Therefore, when the multi-waveguide sheet 50 is applied as described above, the elongation is improved compared to the thick single waveguide sheet 23. Therefore, when the keypad 30 is pressed, the key feeling that is pressed by the elasticity of the metal dome 21 is improved, and the click rate is also improved.

At this time, the light source 14 is located on one side of the multi-waveguide sheet 50 to emit light to the multi-waveguide sheet 50. In addition, the multi-waveguide sheet 50 is formed with waveguides that serve as light movement paths so as to transmit light generated from the light source 14 to the keypad 30. Therefore, since the light is transmitted to the keypad 30 through the first waveguide 51, the second waveguide 52, and the third waveguide 53, the light loss is increased while the light transmission amount increases.

The multi-waveguide sheet 50 is provided in a flexible plate shape, using a material having a certain elasticity. A dome-shaped receiving groove may be provided so that the portion to which the metal dome 21 is bonded may accommodate the metal dome 21.

Meanwhile, as illustrated in FIG. 7, the metal dome sheet 20 is provided with an electromagnetic wave blocking layer 40 to block electromagnetic waves. Here, the electromagnetic wave shielding layer 40 is provided between the multi-waveguide sheet 50 and the base sheet 22 to prevent the printed circuit board 10 and the external electromagnetic waves from interfering with each other or the first waveguide sheet. It is provided by applying or coating on the lower part of 51.

8A to 8B, the first light input unit 51a, the second light input unit 52a, and the third light input unit 51a may be injected into the multi-waveguide sheet 50 so that light from the light source 14 may be input. The light input unit 53a is provided in each of the first waveguide 51, the second waveguide 52, and the third waveguide 53, and the first light input unit 51a and the second light input unit are provided. Each of the first and second waveguides 51 and 52a and 52a is formed by cutting one side of the first waveguide 51, the second waveguide 52, and the third waveguide 53.

In this case, as illustrated in FIG. 8A, the first light input unit 51a, the second light input unit 52a, and the third light input unit 53a are cut at the same position so that one light source 14 may be installed. As shown in FIG. 8B, a plurality of light sources 14 are provided, and each of the light sources 14 includes a first light input unit 51a, a second light input unit 52a, and a third light input unit. Each of the parts 53a may be provided to be positioned differently.

In addition, the first light input part 51a, the second light input part 52a, and the third light input part 53a may have various colors of the keypad 30 separately from the color of the light incident from the light source 14. The color filter 23c is provided to be implemented. The color filter 23c is formed by printing or coating a color on the first light input unit 51a, the second light input unit 52a, and the third light input unit 53a, and the light incident from the light source 14. The color is switched by the color filter 23c and then transmitted to the keypad 30.

Accordingly, the keypad 30 is formed by the color filters 23c formed in the first light input unit 51a, the second light input unit 52a, and the third light input unit 53a regardless of the number of light sources 14. Each light delivered to) has a different color.

In addition, the first waveguide 51, the second waveguide 52, and the third waveguide 53 may have a first light emitting part 51b and a second light guide to improve the light guide rate transmitted to the keypad 30. The exit part 52b and the 3rd exit part 53b are provided, respectively. Here, the first exit unit 51b, the second exit unit 52b, and the third exit unit 53b may be provided in the form of an exit hole or an exit groove, and at least one exit hole is formed to form a keypad by the exit hole. Improve the light guide rate delivered to 30.

In this case, the exit hole may be a fine hole in which a plurality of minute holes are uniformly formed as shown in FIG. 9A, and may be a slit hole cut in a straight or curved shape as shown in FIG. 9B. And the exit groove may be provided by molding and may be provided by pressing at a predetermined pressure.

Accordingly, the first light emitting portion 51b, the second light emitting portion 52b, and the third light emitting portion 53b have different positions, and each of the first light input portion 51a, the second light input portion 52a, When the color of the color filter 23c is provided differently in the three light input parts 53a, the color of the keypad 30 may be varied by the respective color filters 23c.

In addition, the positions of the first light input unit 51a, the second light input unit 52a, and the third light input unit 53a are different, respectively, and the first light input unit 51a and the second light input unit ( 52a) and when the light sources 14 are respectively provided in the third light input unit 53a, the light sources 14 may be blinked, respectively, so that the keypad 30 may be represented in various ways.

Although the technical idea of the metal dome sheet having the waveguide sheet according to the present invention has been described together with the accompanying drawings, this is by way of example and not by way of limitation.

Therefore, it is obvious that any person skilled in the art can make various modifications and imitations such as dimensions, shapes, structures, etc. without departing from the scope of the technical idea of the present invention.

As described above, the metal dome sheet having the waveguide sheet to be integrated by integrating the waveguide sheet may be installed in the key panel to reduce the components of the key panel, thereby simplifying the structure of the key panel and reducing the thickness.

Claims (12)

A base sheet on which a metal dome is installed; And A metal dome sheet having a wave guide sheet installed on the base sheet to fix the metal dome, and including a wave guide sheet for transmitting the light of a light source to a keypad installed on the upper portion. The method of claim 1, The waveguide is provided with a light input unit to allow the light of the light source to be incident, The light dosing unit is a metal dome sheet with a wave guide, characterized in that the color filter is provided so that the keypad can be expressed in a variety of colors. The method of claim 2, The color filter is a metal dome sheet with a wave guide, characterized in that the color is printed or coated on the light input unit. The method of claim 1, The waveguide sheet is a metal dome sheet having a wave guide sheet having an actuator, characterized in that at least one output unit is provided so that the light of the light source can be converted to the keypad. The method of claim 4, wherein The emitting part is a metal dome sheet having a wave guide, characterized in that provided in one selected from the exit hole or the exit groove. The method of claim 1, The waveguide sheet is a metal dome sheet having a wave guide sheet, characterized in that the electromagnetic wave shielding layer is provided to block the electromagnetic waves on the lower surface. A base sheet on which a metal dome is installed; And Multi-layered on the base sheet is fixed to the metal dome, the metal dome sheet with a wave guide sheet comprising a multi-wave guide sheet for transmitting each of the light of the light source to the keypad installed on the top. The method of claim 7, wherein The multi-waveguide is composed of first, second and third waveguides, Each of the first, second, and third waveguides is provided with first, second, and third light input parts for allowing light from the light source to be incident thereon. The first, second, and third light input parts are provided with a color filter for allowing the keypad to be expressed in various colors, respectively. The method of claim 8, The color filter is a metal dome sheet with a wave guide, characterized in that the color is printed or coated in the first, second, third light input unit, respectively. The method of claim 8, The first, second, and third waveguide sheet is a metal dome sheet having a wave guide sheet, characterized in that the first, second, third output unit is provided so that the light of the light source can be switched to the keypad. The method of claim 10, The first, second, and third exit portion of the metal dome sheet having a wave guide, characterized in that provided in the one selected from the exit hole or the exit groove. The method of claim 7, wherein The multi-wave guide sheet is a metal dome sheet having a wave guide sheet, characterized in that the electromagnetic wave blocking layer is provided on the lower surface in contact with the base sheet.

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