KR20090016100A - Cotton light source device - Google Patents

Abstract

The present invention relates to a surface light source device, and more specifically, it is possible to obtain a high brightness of the light emitted from the light emitting device and to prevent the light emitted from the light emitting device from spreading to all sides of the lens. It is possible to emit the light of the light emitting device at high brightness without adopting the light emitting plate, prism plate, and protection plate, which causes the light loss by increasing the emission resistance of the light emitting device. It is to provide a surface light source device that is expected to reduce the effect.

That is, in a conventional surface light source device, a plurality of reflective mirrors whose surfaces are mirror-finished are formed on the bottom surface of the reflector of the reflector at equal intervals, and the reflection array group length is to accommodate the exit surface of the lens. One side wall is provided with a light emitting device so that the light of the light emitting device can be emitted.

Description

Surface light source {Surface light source}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source device suitable for use as a light source when uniformly illuminating a wide plane such as a back light or a signage of a flat panel display, and more particularly, to a light guide plate, a prism plate, and a protective plate. Even if the same emission auxiliary means is not employed, the light of the light emitting device such as the LED can be emitted to the exit surface of the lens with high brightness, and the emitted light can be prevented from spreading.

In general, the surface light source device refers to a device that allows the light of the light emitting device to be emitted to the entire exit surface of the flat lens, and such a device has a problem that the light of the light emitting device should be uniformly emitted to the exit surface of the lens. Holding it.

However, until now, in order to solve the above problem, the light guide plate, the diffusion plate, and the prism plate are arranged and arranged between the reflecting plate of the surface light source device and the rear surface of the lens. That is, when most of the light emitted from the light emitting device is emitted to the light emitting plate by using the light guide plate, the light emitted is diffused to the diffuser plate, and the diffused light is condensed to the prism plate in front of the diffuser plate to emit the light. Uniformity and high brightness were achieved, and some light propagating to the backside of the light guide plate is reflected by the reflector, diffused and collected, and exits to the exit surface of the lens.

However, since the light of the light emitting device sequentially passes through the light guide plate, the reflector plate, the diffuser plate, and the prism plate, the emission resistance is severe and the output light of the lens decreases due to the loss of the emission light. The problem appeared. Of course, there may be a question that a reflection plate reflecting the light of the light emitting device is installed at the rear of the light guide plate to prevent the loss of light. However, even though the light of the light emitting device is reflected by the reflecting plate, the reflection function is weak on the light guide plate itself. As it is emitted through several paths, the emission resistance is not reduced, thereby preventing the loss of light due to the reflection effect of the reflector. Excluding the light guide plate, the reflecting plate, the diffuser plate, and the prism plate in order to solve such a problem, the high brightness and uniformity can not be achieved.

Therefore, the high brightness setting method requires emission aids such as light guide plate, reflector plate, diffuser plate, and prism plate, which is accompanied by the problem of complicated structure.

Accordingly, the present invention solves the problems of low luminance, complicated structure, and high production cost due to the loss of light in the conventional surface light source device, while at the same time, it is possible to propose a surface light source device that can maintain high brightness. It was invented as a subject. That is, the present invention is to provide a surface light source device that can obtain uniformity and high brightness even without employing the emission assistance means such as a light guide plate, a prism plate, and a protective plate.

A reflector in one form of an open enclosure; A lens fixed to the opening of the reflector; A reflecting space between the reflecting plate inner surface of the reflector and the lens; In the surface light source device comprising a light emitting element penetrating one side wall of the reflector and the end portion is introduced into the reflecting space of the reflector, the surface is mirror-mirror (mirror) on the bottom surface of the inner surface of the reflector plate 11 of the reflector 10 A plurality of reflection peaks 12 are formed at equal intervals, but the reflection array group 13 has a length to accommodate the exit surface 21 of the lens 20, and the light emitting element 30 on one wall of the reflector 10. Is to be installed at an angle so as to provide a surface light source device that the light of the light emitting element 30 is emitted to one surface.

On the other hand, in the above, the light emitting devices 30 above and below the one side wall of the reflector 10 are horizontally installed, and the upper vertices of the reflecting mountains 12 formed on the inner surface of the reflector plate 11 are spaced apart from the light emitting devices 30. The inner surface of the reflector plate 11 is formed to be an arc surface 111 or an inclined surface 112 that increases as the distance from the light emitting element 30 increases, and then several reflective mountains 12 are equally spaced on the surface. It is formed so that the reflection array group 13 is partitioned.

In addition, the circular arc surface 111 or the inclined surface 112 in which several reflection peaks 12 are equally spaced on the surface is symmetrically formed at both centers of the inner surface of the reflector plate 11 to be formed on the inner surface of the reflector 10. The light emitting device 30 is symmetrically installed while the reflection array group 13 is convex.

Next, a reflector in the form of an enclosure; A lens fixed to the opening of the reflector; A reflection space between an inner surface of the reflector and the lens of the reflector; In the surface light source device which consists of a light emitting element which penetrates the one side wall of the said reflecting plate, and the edge part is introduce | transduced into the reflecting space of a reflector, The reflector 10 is formed in both open-type enclosures, and the reflecting plate 11 is integrated in the center inside. While forming the lens 20, 20 'is provided in each of the openings on both sides of the reflecting plate 11, the upper and lower bottom surfaces of the reflecting plate 11 is provided with several reflective mountains 12, the surface of which is mirror-mirror (mirror) An array of equally spaced arrays may be formed, and the lengths of the reflective array groups 13 and 13 'may accommodate the exit surfaces 21 of the lenses 20 and 20', and light emitting devices may be disposed above and below one side wall of the reflecting plate 11. By providing (30) and (30 ') at an angle, it is possible to provide a surface light source device in which the light of the light emitting elements (30) and (30') is emitted to both sides.

In addition, the light emitting devices 30 and 30 ′ above and below the one side wall of the reflector 10 are horizontally disposed, and the upper vertices of the reflecting mountains 12 formed at equal intervals on the upper and lower surfaces of the reflecting plate 11 have a light emitting device ( 30 and the upper and lower surfaces of the reflecting plate 11 are formed as an arc surface 111 or an inclined surface 112 that increases as the distance from the light emitting element 30 (30 '), and then several The reflection peaks 12 are formed at equal intervals so that the reflection array groups 13 and 13 'are partitioned.

In addition, the circular arc surface 111 or the inclined surface 112 in which several reflection peaks 12 are equally spaced on the surface is symmetrically formed on both sides of the upper and lower surfaces of the reflecting plate 11 to reflect the reflection array group 13 and 13 '. ), The light emitting elements 30 and 30 'are also symmetrically installed while the reflection array groups 13 and 13' formed on the upper and lower sides of the reflector 10 are vertically symmetrical. .

In the above description, the distance between the reflection peaks 12 of the reflection array groups 13 and 13 ′ can be narrowed away from the light emitting elements 30 and 30 ′, and the shape of the reflection peaks 12 is emitted. Various shapes such as isosceles triangles, cones, and trapezoids are possible depending on the irradiation angles of the elements 30 and 30 ', but the hypotenuse angles of the respective reflection mountains 12 are emitted from the center of the light emitting elements 30 and 30'. It is possible by forming the incident angle (a) due to the direct light and the reflection angle (b) to be emitted perpendicular to the lens 20, 20 'is the same. In addition, it is preferable that the mirror surface state of the reflective mountain 12 maintain the reflectance of 70% or more, and the mirror layer 121 may be formed on the surface of the reflective mountain 12 to improve the reflectance.

According to the present invention, the light irradiated from the light emitting elements 30 and 30 'is directly reflected by the reflection mountain 12 formed on the inner surface or the upper and lower surfaces of the reflecting plate 11, so that the emission surface of the lens 20 and 20' is vertical. The light emitted by the light emitting elements 30 and 30 'can be obtained by emitting light from the light emitting elements 21 and 13', and the reflection array groups 13 and 13 'accommodate the exit surfaces 21 of the lenses 20 and 20'. ) Light can be evenly emitted to the entire emission surface 21 of the lens 20 (20 ') to achieve uniformity and the light emitted from the light emitting element 30 (30') is the lens 20 There is an effect that can prevent the phenomenon of spreading to all sides of the emission surface 21 of the (20 '), and furthermore, in the present invention, the light emitting device 30 in the reflective space between the reflecting plate 11 and the lens 20, 20' There is another effect of not having to employ emission aids such as a light guide plate, a prism plate, and a protection plate that increase the emission resistance of the light emitting device 30 'to cause light loss. In other words, the light emitting device 30, 30' of Exit resistance Since the brightness of the exit surface 21 of the lens 20, 20 'is increased, the above-mentioned effect can reduce the weight of the surface light source device, as well as the simplicity of the structure and the reduction in production cost. Gives birth In addition, according to the use of the lens 20, 20 'has the advantage that can also be used as a diffuser plate using a translucent material.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior descriptions of the known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention. Omit.

According to the present invention, the reflective action of the reflective mountain 12 formed on the inner or upper and lower surfaces of the reflector 10 and the reflective plate 11, the organic coupling relationship between the upper reflective mountain 12 and the light emitting element 30, and the reflection array group 13 ( 13 ') to obtain the effect of high brightness, uniformity, and orthogonal emission on the exit surface 21 of the lens 20, 20'.

On the inner surface of the reflector 10 and on the bottom and bottom surfaces of the reflector 10, several reflective peaks 12 whose surfaces are mirrored are equally spaced, and the light emitting elements 30 and 30 'on the side wall of the reflector 10 are installed at an angle. When the light emitting elements 30 and 30 'are emitted and their light is irradiated to each of the reflective mountains 12, the irradiated light strikes the upper portion of the reflective mountains 12 and then is reflected vertically to emit light 30 and 30'. ') Light is emitted at right angles to the exit surface 21 of the lens 20, 20', so that the emission light is prevented from spreading all over the exit surface 21 of the lens 20, 20 ', Since the lengths of the reflection arrays 13 and 13 'accommodate the exit face 21 of the lenses 20 and 20', the luminance is uniform throughout the exit face 21 of the lenses 20 and 20 '. The light may be emitted from the lens 20 and 20 'because the output resistance (loss) hardly occurs because there is no emission auxiliary means between the reflector plate 11 and the lens 20 and 20'. High brightness light on the exit surface of This will be able to be out.

Here, the light of the light emitting devices 30 and 30 ′ may be reflected vertically by the reflective mountains 12. The hypotenuse angle of each of the reflective mountains 12 is determined at the center of the light emitting devices 30 and 30 ′. This is possible by setting the angle of incidence a due to the direct light emitted and the angle of reflection b to be emitted perpendicular to the lenses 20 and 20 'to be the same.

In addition, the light emitted from the light emitting devices 30 and 30 'decreases as the light intensity moves away from the light emitting devices 30 and 30', and when the light is reflected in the same mirror surface, the reflected light intensity is naturally obtained as well. There is a weakness (unevenness in brightness) that weakens further away from the (30 ').

This vulnerability can be compensated by the reflection array group 13 (13 ') proposed in the present invention, but through the following embodiments it is possible to achieve a more perfect high brightness. The embodiment accordingly,

Example 1

 The upper vertices of the reflective mountains 12 formed on the inner surface of the reflecting plate 11 so as to be farther from the light emitting devices 30 and 30 'are increased so that the size of the reflective peaks is increased by the light emitting devices 30 and 30'. As the distance from the light emitting device increases, the light reflectance of the light emitting elements 30 and 30 'becomes uniform throughout the reflection array groups 13 and 13', thereby achieving high luminance. That is, the size of the reflection peak from the vicinity of the high light intensity of the light emitting elements 30 and 30 'to the far away low light intensity of the light emitting elements 30 and 30'. When the size of the light emitting element 30 and 30 'is increased, the light reflecting amount of the light emitting elements 30 and 30' is increased. The further away from, the lower the luminance can be corrected. As a result, even when the luminous intensity of the light emitting devices 30 and 30 'is weakened in proportion to the irradiation distance, the reflecting amount can achieve a uniform high brightness with different reflection size.

Example 2

The light emitting devices 30 and 30 'are installed horizontally, and the inner surface or the upper and lower surfaces of the reflecting plate 11 are formed as an arc surface 111 or an inclined surface 112 that increases as the distance from the light emitting devices 30 and 30' increases. Then, if several reflective peaks 12 are formed on the surface at equal intervals, the distance between the reflective peaks 12 and the exit surface of the lens 20, 20 'is farther from the light emitting elements 30, 30'. As it approaches, it is reduced in proportion to the distance between the light emitting devices 30 and 30 'and the reflection mountain 12, thereby solving the weakness of the uneven luminance of the lenses 20 and 20'. In other words, a reflection mountain (hereinafter, referred to as a 'near reflection') located closest to the light emitting elements 30 and 30 'reflects light of high intensity, but the reflection of the near reflection and the lens 20 and 20' The reflected light intensity reflected by the distance from the exit surface is increased until it reaches the exit surface 21 of the lens 20, 20 ′, while being emitted farthest from the light emitting element 30, 30 ′. The reflective mountain (hereafter referred to as 'the circular reflective mountain') reflects the light of the light emitting devices 30 and 30 'which is relatively lower than the near reflective mountain, but the output surface of the circular reflective mountain and the lens 20 and 20' ( 21) As the distance between them is close, the reflectance decrease rate is lower than the reflectance decrease rate of the near reflection, so that the reflectance of the near reflection and the circular reflection can be the same, resulting in uniform high brightness.

In addition, it can be seen that the light emitting devices 30 and 30 'are horizontally installed in FIGS. 2, 3, 4, and 5 of the accompanying drawings for [Example 1] and [Example 2]. This is intended to represent that the horizontal installation of the light emitting devices 30 and 30 is also possible in the above embodiment. Therefore, in the above embodiments, the light emitting devices 30 and 30 'may be installed to be inclined or horizontally.

Example 3

When the distance between the reflection peaks of the reflection array groups 13 and 13 'applied in the present invention is narrowed away from the light emitting devices 30 and 30', the light emitting devices having high luminosity of the light emitting devices 30 and 30 'are increased. The light from the light emitting devices 30 and 30 'is higher because the light reflecting efficiency of the light emitting devices 30 and 30' is far higher than that of the light emitting devices 30 and 30 '. As the light intensity decreases away from the light emitting elements 30 and 30 ', the reduction rate can be coped with, thereby achieving uniform high brightness.

Figure 1 (a) is an exemplary view showing the basic configuration of the present invention

       (B) is another example of the reflection array group in (a).

2 and 3 are yet another exemplary view related to the reflection array group of FIG.

Figure 4 (a) is another illustration of the present invention

       (B) is another example of the reflection array group in (a).

5 and 6 are yet another exemplary view related to the reflection array group of FIG.

7 is a view illustrating another example of a reflection array group applied to FIGS. 1 to 6.

8 is an exemplary enlarged view of the reflection dispersion of the present invention.

      Explanation of symbols on important parts of drawing

10: reflector 101: reflection space

11: reflector 111: arc surface

112: slope 12: reflection mountain

121: mirror layer 13,13 ': reflection array group

20,20 ': Lens 21: Exit surface

30,30 ': light emitting element a: incident angle

b: reflection angle

Claims (13)

A reflector in one form of an open enclosure; A lens fixed to the opening of the reflector; A reflecting space between the reflecting plate inner surface of the reflector and the lens; In the surface light source device comprising a light emitting element penetrating one side wall of the reflector and the end portion is introduced into the reflecting space of the reflector, the surface is mirror-mirror (mirror) on the bottom surface of the inner surface of the reflector plate 11 of the reflector 10 A plurality of reflective mountains 12 are formed at equal intervals, and the reflection array group 13 has a length to accommodate the exit surface 21 of the lens 20 and the light emitting device 30 on one sidewall of the reflector 10. Is installed at an angle to the surface light source device characterized in that the light from the light emitting element 30 to be emitted to one side. The method according to claim 1, wherein the reflection array group 13 is formed so that the upper vertices of the reflective mountains 12 which are arranged at equal intervals on the inner surface of the reflecting plate 11 are separated from the light emitting device 30. Cotton light source device. The reflection array group according to claim 1, wherein an inner surface of the reflecting plate 11 is formed as an arcuate surface 111 that increases as the distance from the light emitting element 30 increases, and then several reflective mountains 12 are formed on the surface of the reflecting plate 11 so as to be equally spaced apart. The surface light source device characterized in that 13 is partitioned. The method of claim 1, wherein the inner surface of the reflecting plate 11 is formed as an inclined surface 112 that increases as the distance away from the light emitting device 30, and then formed several reflective mountains 12 on the surface of the reflective array group ( 13) is to be partitioned surface light source device characterized in that. The reflection according to any one of claims 2 to 4, wherein the reflection array group 13 and the light emitting element 30 are symmetrically formed on both sides of the inner surface of the reflecting plate 11 so as to be formed on the inner surface of the reflector 10. The surface light source device, characterized in that the array group (13) is to be convex. A reflector in the form of an enclosure; A lens fixed to the opening of the reflector; A reflection space between an inner surface of the reflector and the lens of the reflector; In the surface light source device which consists of a light emitting element which penetrates the side wall of the reflecting plate, and the edge part is introduce | transduced into the reflecting space of a reflecting body, the reflector 10 is formed in both open-type enclosures, and the reflecting plate 11 is integrated in the center inside. While forming the lens 20, 20 'is provided in each of the openings on both sides of the reflecting plate 11, in the center of the upper and lower surfaces of the reflecting plate 11 to form a plurality of reflective mountains 12, the surface is mirror-like However, the length of the reflection array group 13, 13 'is to accommodate the exit surface 21 of the lens 20, 20', and the light emitting element 30 above and below one side wall of the reflecting plate 11 And 30 'at an angle so that the light of the light emitting elements 30 and 30' can be emitted to both sides. The reflective array group 13 (13 ') of claim 6, wherein the upper and lower vertices of the reflective mountains 12, which are arranged at equal intervals on the upper and lower surfaces of the reflecting plate 11, become higher as the distance from the light emitting element 30 increases. Surface light source device characterized in that. The method of claim 6, wherein the upper and lower surfaces of the reflecting plate 11 is formed as an arcuate surface 111 that increases as it moves away from the light emitting devices 30, 30 ', and then several reflective mountains 12 are formed on the surface. And the reflection array group (13) (13 ') to be partitioned. The method of claim 6, wherein the upper and lower surfaces of the reflecting plate 11 is formed with an inclined surface 112 that increases as the distance from the light emitting elements 30, 30 'is increased, and then several reflective mountains 12 are formed on the surface of the reflecting plate 11 at equal intervals. Planar light source device, characterized in that the reflection array group (13) (13 ') to be partitioned. 10. The reflective array group 13, 13 'and the light emitting elements 30, 30' are symmetrically formed on both sides of the top and bottom centers of the reflecting plate 11. Surface light source device. The method according to any one of claims 1 to 10, characterized in that the distance between the reflection peaks 12 of the reflection array groups 13, 13 'is made narrower as it moves away from the light emitting elements 30, 30'. Surface light source device. The lens 20 according to any one of claims 1 to 10, wherein the inclination angle of the reflection mountain 12 is an incident angle a due to direct light emitted from the center of the light emitting elements 30 and 30 'and the lens 20. The plane light source device characterized in that the reflection angle (b) for exiting perpendicularly to 20 'is the same. The surface light source device according to any one of claims 1 to 10, wherein a mirror surface layer (121) is formed on a surface of the reflective mountain (12).

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