JP2005037772A - Light leakage prevention structure for light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light leakage prevention structure for a light source capable of surely preventing a light leakage to an adjacent part, reducing the number of components and saving the trouble of assembling an optical lens. <P>SOLUTION: This light leakage prevention structure is provided with: light sources 8; the optical lens 1 which derives light to the outside by covering the light source; and a frame 2 in which an opening 3a is provided above the light sources and adjacent light sources are partitioned by left and right walls and a partition wall interposed between both light sources and which supports the light source lens. In the light leakage prevention structure for the light sources, the partition wall 9 is formed roughly in a T shape with a partition body 9a and extended parts 10, 11 which are extended from the end of the partition body 9a to both side along the direction where the light sources are made adjacent to each other, and the adjacent light sources 8 are formed integrally through a fitting part 1c which is fitted with the partition body and the T-shaped extended part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is mainly used for lighting display in personal computers, notebook personal computers, PC cards (memory cards) for function expansion used in these, other general electronic devices, and the like. The present invention relates to a light leakage prevention structure for a light source such as the beginning.

  In an electronic device, for example, an exterior casing made of synthetic resin has various lighting display parts, and when a light source such as an LED used for the lighting is turned on, a measure for preventing light leakage to an adjacent part is provided. is necessary. For example, as shown in the figure seen from below, the left and right side walls 22 and 23, the rear side walls 24 and 25, and the front side wall 26 are formed on the top plate 21 of the cover 20 which is a synthetic resin casing. In addition, there is known a light leakage prevention structure in which the periphery of the optical lens 29 is surrounded by a partition wall 27 interposed between adjacent light sources 28.

  However, there is no continuity as a wall between the partition wall 27 and the rear side walls 24, 25, and light may leak through the adjacent display portion through the optical lens 29. Therefore, there is a drawback that when one LED is lit, it looks as if the other LED is lit. Furthermore, when the peripheral wall body is completely rectangular or circular, the adjacent optical lenses are connected to each other by thickening them in the height direction and providing a connecting portion. It becomes bulky and cannot meet the demand for thinning.

In addition, it is known that a rectangular frame-like frame is formed and a light leakage prevention sheet, a decorative plate, etc. are provided to prevent leakage of the light source. However, there is a problem that the number of parts increases and the number of assembly steps increases.
Japanese Patent Laid-Open No. 7-306648

  The problem to be solved is that light from the light source leaks into the adjacent display section. In addition, the number of parts for preventing light leakage is increased.

  The light leakage prevention structure of a light source according to the present invention includes a light source, a light lens that covers the light source and guides light to the outside, an opening is provided at an upper position of the light source, and adjacent light sources are connected to the left and right walls. Partitioning with a partition wall interposed between the two light sources and a housing for supporting the light source lens, the partition wall extending from the end of the wall body to both sides along the direction adjacent to the light source The wall main body and the extended part are formed in an approximately T shape by an extending part, and the adjacent light source lenses are fitted to the T-shaped wall body and the extending part. It is formed integrally.

In addition, an engaging concavo-convex portion is provided between the optical lens and the side wall on the housing side to prevent the optical lens from coming out from the opening toward the light source;
Furthermore, it includes that the two or more optical lenses adjacent to each other are integrally formed via a fitting portion.

In the light leakage prevention structure of the light source according to the present invention, the partition wall interposed between the adjacent light sources is formed in a substantially T shape to prevent light from being transmitted at the corners, and light leakage to the adjacent portions is prevented. The
In addition, since the concave and convex portions to be engaged are provided between the optical lens and the side wall on the housing side, the optical lens is firmly held so that it does not come out and fall during assembly.
In addition, a plurality of optical lenses are integrated by a fitting part that fits the T-shaped wall body and the extension part, so that it becomes one part, making it easy to handle, reducing the number of parts, and managing inventory. It becomes easy.

  As shown in FIGS. 1 to 3, the light leakage prevention structure of the light source has a cover made of synthetic resin in an electronic device such as a PC card as a casing, and the light from the light source should be blocked inside the casing. A T-shaped fitting portion is formed, and adjacent optical lenses are integrally formed by the fitting portion.

  In the light leakage prevention structure A of the present invention, a transparent or translucent optical lens 1 made of a synthetic resin includes lens bodies 1a and 1b that cover each light source, as shown in FIGS. It is formed from the fitting part 1c which connects 1b integrally. The lens bodies 1a and 1b are each provided with a recess 1d through which light from the light source passes, and a window portion 1e that fits into the opening 3a (see FIG. 3) of the housing, and a side wall of the housing 2. Engaging convex portions 1f are provided.

  On the other hand, as shown in FIG. 3, the housing 2, which is a cover made of synthetic resin, has left and right side walls 4, 5, a front side wall 6, and an adjacent light source 8 on the printed circuit board 7, as shown in FIG. An intervening partition wall 9 is provided. The partition wall 9 is formed in a substantially T shape by the wall main body 9a and extending portions 10 and 11 extending from the end portions thereof in the adjacent direction of the light sources 8 and 8.

  An opening 3a for transmitting light from the light source is provided outside the space surrounded by the left and right side walls 4 and 5 and the substantially T-shaped partition wall 9. Further, the side wall 6 in front of the housing 2 is provided with a concave portion 6a for engaging the convex portion 1f of the optical lens 1 for each light source portion.

  As shown in FIGS. 3A and 3B, the optical lens 1 is fitted to the casing 2 with a fitting portion 1c fitted into a T-shaped portion on the casing 2 side, and the window portion 1e is opened. The protrusion 3 is fitted to the portion 3a, and the convex portion 1f is fitted to the concave portion 6a to be assembled. Thereby, the light leakage prevention structure A with respect to the light source 8 is comprised.

  When either one of the light sources 8 and 8 on the printed circuit board 7 is turned on, light is transmitted through the window portion 1e from the opening 3a and is visually recognized to the outside. The wall main body 9a is prevented from leaking in the left-right direction, and light is surely leaked from the portion formed in a substantially T shape by the wall main body 9a and the extending portions 10 and 11 to the adjacent portion. Be blocked.

  In this way, light leakage of the light source 8 is prevented, and the protrusion 1f is engaged with the recess 6a, so that dropping due to withdrawal is prevented, and as shown in FIG. The pitch α between the adjacent light sources 8 and 8 can be set narrower than before because there is no light leakage even if the wall body 9a is made thin.

  As shown in FIG. 4, in the light leakage prevention structure B according to the second embodiment of the present invention, two or more optical lenses 1 adjacent to each other are integrally formed via a fitting portion 1c, so that one optical lens is formed. 15, as shown in FIG. 5, the fitting portion 1 c is fitted to a T-shaped portion composed of the wall main body 9 a and the extending portions 10 and 11 of the housing 2, and a predetermined position is obtained. Is arranged.

  By doing this, light leakage from the light source 8 can be prevented, and a large number of these optical lenses can be made into one optical lens, the number of parts can be reduced, and the assembly work can be easily handled. It becomes.

  The present invention can be applied to a device for any application where the lighting of a light source needs to be displayed on an exterior panel or the like.

It is the top view (A), front view (B), bottom view (C), side view (D) of the optical lens 1 of the light leakage prevention structure A of the light source of 1st Example which concerns on this invention. The rear view (A) of the optical lens 1, sectional drawing (B) along the AA line in the figure, and sectional drawing (C) along the BB line. It is explanatory drawing (A) of the light leakage prevention structure A of the light source, and sectional drawing (B) along the XX line in the figure. FIG. 4 is a plan view (A), a front view (B), a bottom view (C), and a side view (D) of an optical lens 15 in a second embodiment according to the present invention. It is explanatory drawing which shows the light leakage prevention structure B of the light source which concerns on the 2nd Example. It is a front view which shows the light leakage prevention structure of the light source which concerns on a prior art example.

Explanation of symbols

1 Light leakage prevention structure of light source,
1a, 1b lens body,
1c fitting part,
1d recess,
1e window,
1f convex part,
2 housing,
3 Top plate,
3a opening,
4 side walls,
5 left and right side walls,
6 Front side wall,
6a recess,
7 Printed circuit board,
8 Light source,
9 Bulkhead,
9a wall body,
10, 11 Extension part,
15 Optical lens of the second embodiment.

Claims (3)

A light source;
An optical lens that covers the light source and guides light to the outside;
An opening is provided at an upper position of the light source, the adjacent light source is partitioned by a left and right wall and a partition wall interposed between the two light sources, and a housing that supports the light source lens.
The partition wall is formed in a substantially T-shape with the wall main body and the extending portion by an extending portion extending on both sides along the adjacent direction of the light source from an end portion of the wall main body,
The adjacent light source lenses are integrally formed via a fitting part that fits the T-shaped wall body and the extending part,
A light leakage prevention structure for a light source. An uneven portion to be engaged is provided between the optical lens and the side wall on the housing side to prevent the optical lens from coming out from the opening toward the light source.
The light leakage prevention structure for a light source according to claim 1. Two or more optical lenses adjacent to each other are formed integrally with each other via a fitting portion,
The light leakage prevention structure for a light source according to claim 1.

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