TW201447947A - Light guide plate for illuminated keyboard - Google Patents

Abstract

A light guide for illuminated keyboard is provided. The light guide has a light incident portion, a light emitting surface, a bottom surface and a lateral surface. The light emitting surface is opposite to the bottom surface. The bottom surface comprises a plurality of reflective point. The light from the light incident portion is reflected by the reflective point and then emitted from the light emitting surface. Edges near the lateral surface comprises a breaking structure. The breaking structure prevents light from emitting to the lateral surface.

Description

Light guide plate for illuminated keyboard

The invention relates to a light guide plate for an illuminated keyboard, in particular to a light guide plate having a damaged structure.

FIG. 1 illustrates a conventional illuminated keyboard including a keyboard portion 01 and a light emitting portion 02. In the light-emitting portion 02, the light guide plate 021 is combined with the lateral backlight module 022, and the lateral point light source can be converted into a front-view surface light source, and the light is guided to the key cap 011 by the reflection point 021a. However, the light entering from the side does not completely convert the angle, and some of the light source overflows from other sides, causing light leakage, which affects the beauty of the product.

The present invention relates to a light guide plate for an illuminated keyboard, which prevents light from leaking light by forming a breaking structure on the light guide plate itself.

According to an aspect of the invention, a guide for an illuminated keyboard is proposed Light board. The light guide plate has a light incident portion, a light exit surface, a bottom surface, and a side surface. The light emitting surface is opposite to the bottom surface. The bottom surface includes a plurality of reflection points. The light entering from the light incident portion is reflected by the reflection point, and is derived from the position on the light exit surface corresponding to the reflection point. The edge of the light guide plate near the side has a broken structure to prevent light from overflowing from the side.

In order to provide a better understanding of the above and other aspects of the present invention, the following detailed description of the embodiments and the accompanying drawings

01‧‧‧ Keyboard Department

011‧‧‧Key Cap

02‧‧‧Lighting Department

021, 100, 200, 300, 400, 500‧‧‧ light guide plates

021a, 160‧‧ ‧ reflection point

022‧‧‧Backlight module

110, 210, 310‧‧‧ into the Department of Light

120‧‧‧Glossy

130‧‧‧ bottom

140, 240, 340, 440, 540‧‧‧ side

150, 250, 350, 450, 550‧‧‧ destruction structure

270, 370‧‧‧ holes

380‧‧‧Lighting elements

L‧‧‧Light

FIG. 1 is an exploded perspective view of a conventional illuminated keyboard.

2 is a schematic view of a light guide plate according to an embodiment of the invention.

FIG. 3 is a schematic view of a light guide plate according to another embodiment of the present invention.

4 is a schematic view of a light guide plate according to still another embodiment of the present invention.

FIG. 5 is a schematic view of a light guide plate according to still another embodiment of the present invention.

FIG. 6 is a schematic view of a light guide plate according to still another embodiment of the present invention.

Please refer to FIG. 2, which is a schematic diagram of a light guide plate according to an embodiment of the invention. The light guide plate 100 includes a light incident portion 110, a light exit surface 120, a bottom surface 130, and a side surface 140. The light exit surface 120 is opposite to the bottom surface 130. The light-incident portion 110 and the side surface 140 are located between the light-emitting surface 120 and the bottom surface 130, and are connected to the light-emitting surface 120 and the bottom surface 130. The damage structure 150 is formed on the edge of the light guide plate 100 adjacent to the side surface 140. In this example, the light guide plate 100 is a rectangular flat plate, and the damage structure 150 is formed on the light guide. The edge of the right side of the board 100, in practice, the shape of the light guide plate can be adjusted according to requirements, and the breaking structure 150 can be formed on the edge of any other side 140 except the light portion 110, which is not limited by the invention.

The breaking structure 150 reflexes the edge of the light guide plate near the side 140 Forming, due to material properties, the reflexed position creates a whitening crease that causes the edge near the side 240 to become opaque to prevent light from escaping from the reflexed side 140.

The light guide plate 100 has a refractive index greater than that of a surrounding substance (for example, air). The material is made of, for example, polymethyl methacrylate (PMMA), so that the light L entering from the light incident surface 110 can cause total reflection in the light guide plate 100. When the light guide plate is used for the light-emitting keyboard, as shown in the light guide plate 100 of FIG. 2, a plurality of reflection points 160 are disposed at a specific position on the bottom surface 130, and when the light is incident on the reflection point, the light-emitting surface 120 is correspondingly reflected. The position of the point 160 is derived so that the position of the illumination can be controlled, for example, only the center of the button is illuminated.

In addition, the method of forming the fracture structure is not limited to a reverse one. please Referring to FIG. 3, a schematic diagram of a light guide plate 200 in accordance with another embodiment of the present invention is shown. The breaking structure 250 of the light guide plate 200 is surface-treated by grinding or heating to atomize the side surface 240, and the edge is made opaque to block light. In this example, the light guide plate 200 further has a hole 270 for allowing an object such as a screw to pass through and fix the position of the light guide plate 200. In order to prevent light from escaping from the break hole 270, the breaking structure 250 may be formed near the edge portion of the hole 270.

Please refer to FIG. 4, which illustrates a guide according to another embodiment of the present invention. Schematic diagram of the light panel 300. The light guide plate 300 also has a hole 370, but the hole here It is used to house a light-emitting element 380 such as an LED. That is, the peripheral edge of the hole 370 is the light incident portion 310 of the light guide plate 300. In addition, in this example, the sacrificial structure 350 is formed in a laser-fired manner by forming a laser-sharp line at the edge of the side surface 340, and also blocks light from overflowing from the side surface 340. In one embodiment, when the laser spot distance is 0.01 mm (mm), the width of the laser is 2 mm, and the laser marking speed is 500 mm (500 mm/s) per second, the formed Lei-ray line can effectively block Light leakage at the edges. Of course, the above parameters are for illustrative purposes only and do not limit the invention.

Please refer to FIG. 5, which illustrates a guide according to still another embodiment of the present invention. Schematic diagram of light panel 400. The breaking structure 450 of the light guide plate 400 deforms the edge near the side surface 440 to make the edge non-original shape (planar). The deformation mode may be extrusion, cutting, thinning, sealing, etc., and the invention is not limited thereto. The deformed edge can become opaque and prevent light from escaping. Alternatively, as shown in Fig. 6, a complicated path is formed near the edge of the side surface 540, so that it is difficult to escape from the side surface 540 after the light is reflected inside the light guide plate.

It is worth noting that the damage structure on the light guide plate is not limited to a single One way to form, but can be mixed, for example, first deformed in heating, or first cut and then squeezed, and the like. Similarly, when there are a plurality of holes in the light guide plate, the holes are not limited to a single use, and some of the holes may be provided with a light-emitting element, the periphery of which is a light-in part, and the edge has no damage structure, and the other The edge of the hole can have a broken structure.

The light guide plate of the above embodiment of the present invention prevents light leakage by breaking the structure The situation happened. These damage structures are formed on the light guide plate itself without the need for other external components, which can reduce the consumption of additional components such as shielding sheets, and reduce the loading. Set the size or increase the available space inside. In addition, the process of destroying the structure also saves time and time compared to the currently used edge spraying process, and there is no problem of paint contamination, which can improve product yield.

In conclusion, the present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Light guide plate

110‧‧‧Into the Department of Light

120‧‧‧Glossy

130‧‧‧ bottom

140‧‧‧ side

150‧‧‧Destruction structure

160‧‧‧Reflection points

L‧‧‧Light

Claims (6)

A light guide plate for an illuminated keyboard, the light guide plate having a light incident portion, a light exit surface, a bottom surface and a side surface, the light exit surface being opposite to the bottom surface, the bottom surface comprising a plurality of reflection points, entering from the light entrance portion After the light is reflected by the reflection point, the light exiting surface is derived from a position corresponding to the reflection point, wherein the light guide plate has a broken structure near the edge of the side surface to prevent light from overflowing from the side surface. The light guide plate for an illuminated keyboard according to claim 1, wherein the damage structure is formed by extrusion, laser burning, deformation or atomization. The light guide plate for an illuminated keyboard according to claim 2, wherein the damage structure is formed by folding the light guide plate toward an edge of the side surface. The light guide plate for an illuminated keyboard according to claim 2, wherein the damage structure is formed by heating or pressurizing the light guide plate near an edge of the side surface. The light guide plate for an illuminated keyboard according to the first aspect of the invention, wherein the light guide plate comprises a hole, the portion of the light guide plate adjacent to the hole has the breaking structure to prevent light from being surrounded by the hole overflow. The light guide plate for an illuminated keyboard according to claim 1, wherein the light guide plate comprises a hole, and the light incident portion is located at a periphery of the hole.