JP2010113998A - Light guide member, light source device and mobile terminal apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide member improving transmissivity of light while holding deterioration of strength to a minimum, and to provide a light source device and a mobile terminal apparatus. <P>SOLUTION: The light guide member is arranged on the top surface of a light emitting element to guide a light from the light emitting element, and includes a recessed part for the light emitting element. In the shape of the recessed part, an area of the most thin part between the upper surface of the light guide member and the recessed part is small, and a stress from the surface of the light guide member is distributed. Thanks to the light guide member formed as above, the transmissivity of light is improved while holding deterioration of strength to a minimum. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light guide member, a light source device, and a portable terminal device, and more particularly to a light guide member, a light source device, and a portable terminal device that increase light transmittance while minimizing deterioration in strength.

  In a device having a light emitting function such as an LED (Light Emitting Diode) such as a cellular phone, the casing portion of the light emitting part is provided with a light guide member to guide light, or a hole is formed in the casing surface. A structure in which a lid is made of a material having a high transmittance or a circuit board in which an LED is provided in a groove provided in an exterior panel is employed (see Patent Document 1).

If the surface of the housing is not perforated, select the housing material or paint with a low decrease in transmittance, and provide an LED directly under the light guide member (see Fig. 6). When it becomes insufficient, a structure such as reducing the thickness of the casing of the transmission portion has been adopted (see FIG. 7). In addition, a light semi-transmissive portion is provided on the concave surface of the light emitting element recess of the light guide member to suppress the increase in luminance at the portion located immediately above the light emitting element, and the luminance distribution on the light emitting surface of the light guide member A uniform structure has been proposed (see Patent Document 2).
JP 2006-173729 A JP 2007-287678 A

  However, simply reducing the thickness of the casing will result in insufficient strength, so there is a limit to how thin it can be, and satisfactory brightness can be obtained in casings using materials with low transmittance or paint. There was no case. In addition, a complicated structure such as provision of a light semi-transmissive portion is not preferable for a device that is generally desired to be downsized.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light guide member that increases light transmittance while minimizing strength deterioration.

  A light guide member according to the present invention is a light guide member that is disposed on an upper surface of a light emitting element and guides light from the light emitting element, and is provided with a recessed portion for the light emitting element, and the shape of the recessed portion is The area of the thinnest portion between the upper surface of the light guide member and the top of the recessed portion is small, and is shaped to disperse stress from the surface of the light guide member.

  A light source device according to the present invention includes a substrate on which a light emitting element is provided, a first light guide member that is disposed on an upper surface of the substrate on which the light emitting element is provided, and that guides light from the light emitting element; And a second light guide member that guides light from the light emitting element, and the second light guide member is the light guide member according to the present invention. It is characterized by that.

  A portable terminal device according to the present invention uses the light source device according to the present invention.

  According to the present invention, it is an object to provide a light guide member that increases light transmittance while minimizing deterioration in strength.

  Embodiments of the present invention will be described below in detail with reference to the drawings. The embodiments described below are preferred embodiments of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

  The structure of the light guide member according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the light guide member 202 according to the present embodiment is disposed on the upper surface of a light source 100 including a light emitting element, and a hemispherical recess for the light source 100 is provided. The light emitting source 100 is mounted on the substrate 300.

  The hemispherical dent provided in the light guide member 202 is provided in a place where the light source 100 is accommodated when the light guide 100 is installed on the substrate 300, and diffuses light from the light source 100 to transmit the light guide member. It becomes possible to make the light brighter.

  Furthermore, in the case of the hemispherical dent structure according to the present embodiment, the thickness of the thinnest part (z) in the structure shown in FIGS. 6, 7, and 1 is z0> z1> z2, Compared to the case where the thickness is simply reduced (see FIG. 7), the area of the thinnest portion is smaller than the structure shown in FIG. For this reason, the stress is dispersed by the hemispherical structure, and for example, the possibility of breakage when stress is applied from the light guide member surface can be minimized.

  As described above, according to the structure of the light guide member according to the present embodiment, the light guide member can be provided even if it has a structure in which the strength deterioration of the light guide member is minimized and the housing surface is not perforated. It is possible to make the light emitted from the light source inside the light guide member brighter when viewed from the surface of the member.

  Although it does not specifically limit as a light emitting element used for the light emission source 100, For example, it can consider using LED.

  The light guide member 202 is not particularly limited as long as light propagates. For example, an acrylic resin, a polycarbonate resin, a liquid crystal polymer, a polystyrene resin, or the like can be used.

  Next, another embodiment according to the present invention will be described. A feature of the light guide member according to the above embodiment is that the light guide member disposed on the light emitting source 100 is provided with a hemispherical recess, but the area of the thinnest part is small, and stress from the member surface is dispersed. Since the same effect can be obtained as long as the structure is, the shape of the recess is not limited to the shape shown in FIG.

  Therefore, for example, even in the shape shown in each cross-sectional view of FIG. 2, since the area of the thinnest part is small and the stress from the member surface is dispersed, the same effect as that of the embodiment shown in FIG. Even if it is a structure that minimizes the strength deterioration of the optical member and does not make a hole in the surface of the housing, it depends on the case of using the light guide member and viewing the light of the light source inside the light guide member from the member surface It becomes possible to brighten.

  FIG. 3 is a view of a recessed portion for the light emitting source 100 as viewed from the upper surface side of the member. As shown in FIGS. 2b and 2c, in the shape where the area of the thinnest portion at the top is the smallest, a shape as shown in FIG. 3 can be considered. For example, the concave portion is a quadrangular pyramid shown in FIG. 3 (a), a pentagonal pyramid shown in (b), a hexagonal pyramid shown in (c), an octagonal pyramid shown in (d), or a cone shown in (e). But it ’s okay. In any case, the area of the thinnest part is small, and the stress from the member surface is dispersed.

  Furthermore, another embodiment according to the present invention will be described with reference to FIG. As shown in FIG. 4, when there are a plurality of light emitting sources, the brightness of the light can be changed by changing the size of the light emitting source recess provided in the light guide member 203 for each light emitting source. Moreover, it can respond in various shapes for each light source.

  Moreover, as another embodiment, application to the detachable light guide member 204 used as a dress-up panel of a mobile phone terminal can be considered. FIG. 5 is a cross-sectional view of the light guide member according to the present embodiment. The light guide member 204 is a removable panel for a mobile phone terminal.

  In this case, the light guide member 205 provided on the upper part of the light emitting source is thin or has a high transmittance by using a material having a high transmittance. Although the strength deterioration is concerned by reducing the thickness, since the detachable panel portion (light guide member) 204 is arranged on the upper portion of the light guide member 205, the strength deterioration can be minimized.

  Further, in order to diffuse light and make it brighter, the light guide member 204 is provided with, for example, a hemispherical recess. Thus, it is also possible to have a double structure (light guide members 204 and 205) as a whole.

  A structure in which the above 204 and 205 are reversed may be used. Moreover, although this embodiment demonstrated using the removable light guide member, it does not need to be removable.

  With the structure according to the above-described embodiment, it is possible to minimize the strength deterioration of the light guide member, and to brighten the light from the light source inside the member when viewed from the member surface.

  Although the present invention has been specifically described based on the preferred embodiments, it is needless to say that the present invention is not limited to the above-described ones and can be variously modified without departing from the gist thereof.

It is sectional drawing of the light guide member which concerns on embodiment of this invention. It is sectional drawing of the recessed part provided in the light guide member which concerns on other embodiment of this invention. It is a figure which shows the shape which looked at the recessed part provided in the light guide member which concerns on other embodiment of this invention from the member upper surface side. It is sectional drawing of the recessed part provided in the light guide member which concerns on other embodiment of this invention. It is sectional drawing of the recessed part provided in the light guide member which concerns on other embodiment of this invention. It is sectional drawing of the conventional light guide member. It is sectional drawing of the conventional light guide member.

Explanation of symbols

100, 101, 102 Light emission source 200, 203, 204, 205 Light guide member 300 Substrate

Claims (8)

A light guide member that is disposed on the upper surface of the light emitting element and guides light from the light emitting element,
A recess for the light emitting element is provided;
The shape of the recessed portion is such that the area of the thinnest portion between the upper surface of the light guide member and the top of the recessed portion is small and the stress from the surface of the light guide member is dispersed. A light guide member.   The light guide member according to claim 1, wherein the shape of the recess is a hemispherical recess.   The light guide member according to claim 1, wherein the shape of the recessed portion is a cone. A plurality of the recessed portions are provided,
The light guide member according to any one of claims 1 to 3, wherein at least the shape or size of the recessed portions is different between the plurality of recessed portions. A substrate provided with a light emitting element;
A first light guide member that is disposed on an upper surface of the substrate on which the light emitting element is provided and guides light from the light emitting element;
A second light guide member disposed on the upper surface of the first light guide member and guiding light from the light emitting element,
5. The light source device according to claim 1, wherein the second light guide member is the light guide member according to claim 1.   6. The light source device according to claim 5, wherein the first light guide member is made of a material having at least a small thickness or a high transmittance.   The light source device according to claim 5, wherein the second light guide member is detachable.   A portable terminal device using the light source device according to claim 5.

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