JP2007065694A - Light-transmitting body - Google Patents

Light-transmitting body Download PDF

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JP2007065694A
JP2007065694A JP2006315813A JP2006315813A JP2007065694A JP 2007065694 A JP2007065694 A JP 2007065694A JP 2006315813 A JP2006315813 A JP 2006315813A JP 2006315813 A JP2006315813 A JP 2006315813A JP 2007065694 A JP2007065694 A JP 2007065694A
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light
surface portion
light guide
incident
flat
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JP4295782B2 (en
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Kariru Karantaru
カリル カランタル
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Nippon Leiz Corp
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Nippon Leiz Corp
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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate boundary parts between incident end face parts and a front face part, making adjoining boundary parts inconspicuous as lines, even if two or more light-emitting bodies are arrayed, enabling the light guided from the incident end faces of two or four side faces to exit from a large flat part, and also enabling the light-emitting bodies themselves independent, without having to use a support body. <P>SOLUTION: The light-transmitting body 2 includes the front face part 5 for making the light exit therefrom, a rear-side part 6 positioned in the opposite direction of the front-face side 5, and side face parts connecting to the front-face part 5 and the rear-side part 6. The front-face part 5 consists of a flat part 5a and inclined face parts 5b, whose both ends are inclined in the direction of the rear side part 6, and the side-face parts, connecting the front-face part to the rear-face part, are made parallel to the flat part 5a of the front-face part, and these two parallel side-face parts are used as incident end face parts 7a, 7b that guide the light. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、大きな平面照明装置を提供する場合に最適であって、入射端面部と表面部との臨界部分が無く、複数並べても互いの隣接する境界部が線として目立たず、2両側面または4側面の入射端面部から導いた光を大きな平坦部から出射することができるとともに支持体を用いずに導光体自体で自立することができる導光体に関するものである。   The present invention is optimal for providing a large flat illumination device, and there is no critical portion between the incident end surface portion and the surface portion, and even if a plurality of the lighting devices are arranged, the adjacent boundary portions are not conspicuous as lines. The present invention relates to a light guide body that can emit light guided from the incident end face portions on the four side surfaces from a large flat portion and can stand on its own without using a support.

従来の大画面用の導光体は、導光体自体を大きくし、光源からの光を最大限に利用する目的で2側面部や4側面部を入射面部として用いている。また、導光板の厚さを入射端面部から離れるほど薄くさせる、所謂楔形状に成形して、入射端面部から入射端面部の反対方向に向かう光のテーパーリークを利用する方法が知られている。   Conventional light guides for large screens use the two side surfaces and the four side surfaces as the incident surface for the purpose of making the light guide itself large and maximally utilizing the light from the light source. Further, a method is known in which the light guide plate is formed into a so-called wedge shape that is thinned away from the incident end face part, and a taper leak of light from the incident end face part in the opposite direction to the incident end face part is used. .

また、大画面用の大きな平面照明装置の場合には、導光体を用いずにケース内に冷陰極蛍光管の様な光源を並べ、上部に拡散板を用いた方法が知られている。   In the case of a large flat illumination device for a large screen, a method is known in which light sources such as cold cathode fluorescent tubes are arranged in a case without using a light guide, and a diffusion plate is used in the upper part.

従来の大画面用の導光体として、導光体自体を大きくし、光源からの光を最大限に利用する目的で2側面部や4側面部を入射面部として用いる場合には、必要とする大きさに対応した導光体が必要となる。このため、導光体の大きさが大きくなるに従い、導光体の自重により撓みの発生が生じる。この撓みの発生を回避するためには、導光体の厚さを厚さを厚くしなければならず、そのため導光体の重量が大きくなる課題がある。また、導光体の厚さを入射端面部から離れるほど厚さを薄くさせる、所謂楔形状に成形して、入射端面部から入射端面部の反対方向に向かう光のテーパーリークを利用する方法では、厚さが薄くなる部分の強度や保持が困難であるという課題がある。しかも、これら導光体を大きくした場合、輝度を向上させるには光源を増やす必要があり、入射端面部の厚さを厚くしなければならない課題がある。   As a conventional light guide for a large screen, it is necessary when the light guide itself is enlarged and the two side surfaces or the four side surfaces are used as the incident surface for the purpose of maximizing the light from the light source. A light guide corresponding to the size is required. For this reason, as the size of the light guide increases, the occurrence of bending occurs due to the weight of the light guide. In order to avoid the occurrence of this bending, it is necessary to increase the thickness of the light guide, and there is a problem that the weight of the light guide increases. In addition, in the method of forming the light guide in a so-called wedge shape that decreases the thickness as the distance from the incident end surface portion increases, the taper leak of light from the incident end surface portion in the opposite direction to the incident end surface portion is used. However, there is a problem that it is difficult to maintain the strength and retention of the portion where the thickness is reduced. In addition, when these light guides are enlarged, it is necessary to increase the number of light sources in order to improve the luminance, and there is a problem that the thickness of the incident end face part must be increased.

さらに、大画面化を図るため、従来の導光体を複数つないで用いた場合には、導光体の端部である互いの隣接する境界部が線として目立ってしまう課題がある。   Furthermore, when a plurality of conventional light guides are used in order to increase the screen size, there is a problem that adjacent boundary portions that are end portions of the light guide are conspicuous as lines.

また、導光体の側面側に光源を設ける従来の平面照明装置の場合には、光源が側面部にあるため、導光体からの出射光が導光体の出射面に沿ったような光が多く出射する課題がある。   Further, in the case of a conventional flat illumination device in which a light source is provided on the side surface of the light guide, since the light source is located on the side surface, the light emitted from the light guide is light along the output surface of the light guide. There is a problem that a large amount of light is emitted.

さらに、従来の大きな画面を得る大きな平面照明装置の場合に、導光体を用いずにケース内に冷陰極蛍光管の様な光源を並べ、上部に拡散板を用いた、所謂、直下型バックライトの平面照明装置では、平面照明装置の大きさに対応してケースの大きさを大きくしなければならない課題がある。
また、ある程度の大きさになると、拡散板自身の重量で拡散板が撓んでしまう課題がある。この撓みを回避するため、支持部を設けると、支持部の影や支持部分の輝度の低下に課題がある。
Furthermore, in the case of a conventional large flat illumination device that obtains a large screen, a so-called direct-type back, in which a light source such as a cold cathode fluorescent tube is arranged in a case without using a light guide, and a diffusion plate is used in the upper part. In the flat illumination device of a light, there exists a subject which must enlarge the magnitude | size of a case corresponding to the magnitude | size of a flat illumination device.
Moreover, when it becomes a certain size, there is a problem that the diffusion plate is bent by the weight of the diffusion plate itself. In order to avoid this bending, when a support part is provided, there is a problem in the shadow of the support part and the brightness of the support part.

(発明の目的)
本発明は、上記のような課題を解決するためになされたもので、入射端面部と表面部との臨界部分が無く、複数並べても互いの隣接する境界部が線として目立たず、2両側面または4側面の入射端面部から導いた光を大きな平坦部から出射することができるとともに支持体を用いずに導光体自体で自立することができる導光体を提供することにある。
(Object of invention)
The present invention has been made in order to solve the above-described problems. There is no critical portion between the incident end surface portion and the surface portion, and even when a plurality of rows are arranged, adjacent boundary portions are not conspicuous as lines. Another object of the present invention is to provide a light guide that can emit light guided from the incident end face portions on the four side surfaces from a large flat portion and can stand on its own without using a support.

本発明の請求項1に係る導光体は、表面部が平坦部と2両端を裏面部方向に傾斜させた傾斜面とから成り、側面部を表面部の平坦部に平行にし、この平行な2つの側面部を、光を導く入射端面部とし、表面部の平坦部と傾斜面とから光を出射することを特徴とする。   The light guide according to claim 1 of the present invention comprises a flat surface portion and an inclined surface in which both ends are inclined toward the back surface portion, and the side surface portion is parallel to the flat portion of the front surface portion. The two side surface portions are incident end surface portions that guide light, and light is emitted from the flat portion and the inclined surface of the surface portion.

請求項1に係る導光体は、表面部が平坦部と2両端を裏面部方向に傾斜させた傾斜面とから成り、側面部を表面部の平坦部に平行にし、この平行な2つの側面部を、光を導く入射端面部とし、表面部の平坦部と傾斜面とから光を出射するので、入射端面部と表面部との臨界部分が無く、複数並べても互いの隣接する境界部が線として目立たず、2両側面の入射端面部から導いた光を大きな平坦部から出射することができるとともに支持体を用いずに導光体自体で自立することができる。   The light guide according to claim 1 is composed of a flat surface portion and an inclined surface in which both ends are inclined in the direction of the back surface portion, and the side surface portion is parallel to the flat portion of the front surface portion. Since the light is emitted from the flat portion and the inclined surface of the surface portion, there is no critical portion between the incident end surface portion and the surface portion. The light is not conspicuous as a line, and the light guided from the incident end surface portions on the two side surfaces can be emitted from the large flat portion and can be self-supported by the light guide itself without using the support.

また、請求項2に係る導光体は、表面部が平坦部と4端を裏面部方向に傾斜させた傾斜面とから成り、側面部を表面部の平坦部に平行にし、この平行な4つの側面部を、光を導く入射端面部とし、表面部の平坦部と傾斜面とから光を出射することを特徴とする。   In the light guide according to claim 2, the surface portion includes a flat portion and an inclined surface having four ends inclined toward the back surface portion, and the side surface portion is parallel to the flat portion of the surface portion. One side surface portion is an incident end surface portion that guides light, and light is emitted from the flat portion and the inclined surface of the surface portion.

請求項2に係る導光体は、表面部が平坦部と4端を裏面部方向に傾斜させた傾斜面とから成り、側面部を表面部の平坦部に平行にし、この平行な4つの側面部を、光を導く入射端面部とし、表面部の平坦部と傾斜面とから光を出射するので、入射端面部と表面部との臨界部分が無く、複数並べても互いの隣接する境界部が線として目立たず、4側面の入射端面部から導いた光を大きな平坦部から出射することができるとともに支持体を用いずに導光体自体で自立することができる。   The light guide according to claim 2 includes a flat surface portion and an inclined surface in which four ends are inclined toward the back surface portion, and the side surface portion is parallel to the flat portion of the front surface portion. Since the light is emitted from the flat portion and the inclined surface of the surface portion, there is no critical portion between the incident end surface portion and the surface portion. The light is not conspicuous as a line, and the light guided from the incident end surface portions on the four side surfaces can be emitted from the large flat portion and can be self-supported by the light guide itself without using the support.

さらに、請求項3に係る導光体は、光を屈折および全反射する光偏向素子を表面部および裏面部に設けることを特徴とする。   Furthermore, the light guide according to claim 3 is characterized in that a light deflection element that refracts and totally reflects light is provided on the front surface portion and the back surface portion.

請求項3に係る導光体は、光を屈折および全反射する光偏向素子を表面部および裏面部に設けるので、表面部方向に傾斜した導光体の2両端または4端の傾斜部分および表面部分から均一で同等の光を出射することができる。   The light guide according to claim 3 is provided with light deflecting elements that refract and totally reflect light on the front surface portion and the back surface portion. Uniform and equivalent light can be emitted from the portion.

以上のように、請求項1に係る導光体は、表面部が平坦部と2両端を裏面部方向に傾斜させた傾斜面とから成り、側面部を表面部の平坦部に平行にし、この平行な2つの側面部を、光を導く入射端面部とし、表面部の平坦部と傾斜面とから光を出射するので、入射端面部と表面部との臨界部分が無く、複数並べても互いの隣接する境界部が線として目立たない。そして、2両側面の入射端面部から導いた光を大きな平坦部から出射することができるとともに支持体を用いずに導光体自体で自立することができる。これにより、導光体を多数並べることで目的とする大きさの平面照明装置に対応した大きさの導光体を得ることができる。   As described above, the light guide according to the first aspect includes a flat surface portion and two inclined surfaces in which both ends are inclined toward the back surface portion, and the side surface portion is parallel to the flat portion of the front surface portion. Two parallel side surfaces are used as incident end surfaces for guiding light, and light is emitted from the flat portion and the inclined surface of the surface portion. Adjacent borders are inconspicuous as lines. Then, the light guided from the incident end face portions on the two side surfaces can be emitted from the large flat portion and can be self-supported by the light guide itself without using the support. Thereby, the light guide of the magnitude | size corresponding to the planar illuminating device of the target magnitude | size can be obtained by arranging many light guides.

請求項2に係る導光体は、表面部が平坦部と4端を裏面部方向に傾斜させた傾斜面とから成り、側面部を表面部の平坦部に平行にし、この平行な4つの側面部を、光を導く入射端面部とし、表面部の平坦部と傾斜面とから光を出射するので、入射端面部と表面部との臨界部分が無く、複数並べても互いの隣接する境界部が線として目立たない。そして、4側面の入射端面部から導いた光を大きな平坦部から出射することができるとともに支持体を用いずに導光体自体で自立することができる。これにより、導光体を多数並べることで目的とする大きさの平面照明装置に対応した大きさの導光体を得ることができる。   The light guide according to claim 2 includes a flat surface portion and an inclined surface in which four ends are inclined toward the back surface portion, and the side surface portion is parallel to the flat portion of the front surface portion. Since the light is emitted from the flat portion and the inclined surface of the surface portion, there is no critical portion between the incident end surface portion and the surface portion. It doesn't stand out as a line. And the light guided from the incident end surface part of 4 side surfaces can be radiate | emitted from a big flat part, and it can become independent by light guide itself, without using a support body. Thereby, the light guide of the magnitude | size corresponding to the planar illuminating device of the target magnitude | size can be obtained by arranging many light guides.

請求項3に係る導光体は、光を屈折および全反射する光偏向素子を表面部および裏面部に設けるので、表面部方向に傾斜した導光体の2両端または4端の傾斜部分および表面部分から均一で同等の光を出射することができる。これにより、傾斜部分を含め導光体全体から平面光を得ることができる。   The light guide according to claim 3 is provided with light deflecting elements that refract and totally reflect light on the front surface portion and the back surface portion. Uniform and equivalent light can be emitted from the portion. Thereby, plane light can be obtained from the whole light guide including an inclined part.

以下、本発明の実施の形態を添付図面に基づき説明する。
なお、本発明の導光体を用いた平面照明装置は、光源と、光源からの光を均一な平面光を提供する第1の導光体と、この第1の導光体からの光を大きな平坦部から出射できる第2の導光体から構成される。そして、第2の導光体は、導光体の側面部が裏面部方向に向く様に、導光体の表面部に大きな平坦部を残す様に導光体の表面部の2両端や4端を裏面部方向に傾けて2つまたは4つの傾斜面部を形成し、側面部を表面部の平坦部や裏面部と平行になる様にし、この平行な部分(側面部)を入射端面部としている。これにより、入射端面部から入射した光が傾斜面部で全反射を繰り返しながら表面部に達し、表面部や裏面部および傾斜面部に光偏向素子を設け、入射端面部から入射した光の一部は傾斜面部で出射し、裏面部に設けた光偏向素子によって表面部方向に全反射をし、直接表面部から出射したり、表面部に達した光を光偏向素子によって表面部から出射することができる。
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
The flat illumination device using the light guide of the present invention includes a light source, a first light guide that provides uniform light from the light source, and light from the first light guide. It is comprised from the 2nd light guide which can radiate | emit from a large flat part. The second light guide has two ends of the surface portion of the light guide and four ends so that a large flat portion is left on the surface portion of the light guide so that the side surface portion of the light guide faces the back surface. The end is inclined in the direction of the back surface to form two or four inclined surface portions, the side surface portion is made parallel to the flat portion of the front surface portion and the back surface portion, and this parallel portion (side surface portion) is used as the incident end surface portion. Yes. As a result, the light incident from the incident end face reaches the surface while repeating total reflection at the inclined surface, and the light deflecting elements are provided on the front, back and inclined surfaces, and part of the light incident from the incident end is The light can be emitted from the inclined surface portion, totally reflected in the direction of the surface portion by the light deflection element provided on the back surface portion, and directly emitted from the surface portion, or the light reaching the surface portion can be emitted from the surface portion by the light deflection element. it can.

また、この第2の導光体の入射端面部に入射するための平面光は、第1の導光体によって、光源からの光を導く細長い入射面部と、この入射面部に対向する位置に入射面部よりも広い幅を有する出射面部と、これら入射面部と出射面部とを接続し、相対する2つの傾斜側面と2つの側面とからなる。そして、光源から入射面部に導いた光の内、一部は直接出射面部に達し、入射面部で大きく屈折した光は傾斜側面で全反射をし、略垂直に出射面部に達し、この出射面部から出射し、第2の導光体の入射端面部に向かう。そのため、第1の導光体の出射面部は第2の導光体の入射端面部の略2倍の幅を有して第1の導光体の出射面部からの光を余すこと無く第2の導光体に到達し、第2の導光体の表面部の平坦部から均一な平面光を得ることができる。   Further, the planar light to be incident on the incident end surface portion of the second light guide is incident on the elongated light incident surface portion that guides the light from the light source by the first light guide and the position facing the incident surface portion. The emission surface portion having a width wider than the surface portion, and the incident surface portion and the emission surface portion are connected to each other, and are composed of two inclined side surfaces and two side surfaces facing each other. And, part of the light guided from the light source to the incident surface part directly reaches the output surface part, and the light refracted greatly at the incident surface part is totally reflected by the inclined side surface and reaches the output surface part substantially vertically, and from this output surface part The light is emitted and travels toward the incident end face of the second light guide. Therefore, the exit surface portion of the first light guide has a width approximately twice that of the incident end surface portion of the second light guide, and the second light without leaving the light from the exit surface portion of the first light guide. It is possible to obtain uniform planar light from the flat portion of the surface portion of the second light guide.

図1(a)は本発明に係る導光体を含む平面照明装置の略斜視構成図、図1(b)は図1(a)の平面照明装置の略断面図、図2(a),(b)および図3(a),(b)は本発明に係る第2の導光体を示す図、図4は第2の導光体の光の軌跡を示す図、図5は第1の導光体の略斜視図、図6は第1の導光体の光の軌跡を示す図である。   1A is a schematic perspective view of a flat illumination device including a light guide according to the present invention, FIG. 1B is a schematic cross-sectional view of the flat illumination device of FIG. 1A, and FIG. FIGS. 3B and 3B are views showing the second light guide according to the present invention, FIG. 4 is a view showing the light path of the second light guide, and FIG. FIG. 6 is a diagram showing the locus of light of the first light guide.

図1に示すように、平面照明装置1は、第1の導光体3、第2の導光体2、光源9、反射体10を備えて概略構成される。この平面照明装置1は、反射体10で囲まれた第1の導光体3の入射面部近傍に備える光源9から第1の導光体3に光を導いている。第1の導光体3の出射面部には、複数(2つ)の入射端面部が接触または近傍に来る様に第2の導光体2が配置されている。これにより、第1の導光体3の出射面部から出射した光を、第2の導光体2の入射端面部から取り込み、表面部5の広い平坦部5aから光を出射させている。   As shown in FIG. 1, the flat illumination device 1 is schematically configured to include a first light guide 3, a second light guide 2, a light source 9, and a reflector 10. In the flat illumination device 1, light is guided from the light source 9 provided in the vicinity of the incident surface portion of the first light guide 3 surrounded by the reflector 10 to the first light guide 3. The second light guide 2 is disposed on the exit surface portion of the first light guide 3 so that a plurality (two) of incident end face portions come in contact with or in the vicinity thereof. Thereby, the light emitted from the emission surface portion of the first light guide 3 is taken in from the incident end surface portion of the second light guide 2, and the light is emitted from the flat portion 5 a having the wide surface portion 5.

第1の導光体3と第2の導光体2とは、屈折率が1.4〜1.7程度の透明なアクリル樹脂(PMMA)やポリカーボネート(PC)等で形成されている。   The first light guide 3 and the second light guide 2 are formed of a transparent acrylic resin (PMMA) or polycarbonate (PC) having a refractive index of about 1.4 to 1.7.

第2の導光体2(2A)は、図2(a),(b)に示す様に、表面部5が大きな平坦部5aを有している。この第2の導光体2Aは、表面部5の2両端を裏面部6方向に傾斜する傾斜面部5bを形成し、表面部5と裏面部6とが接続する4つの側面部8(導光体2Aの厚さに相当)のうち互いに向き合う2つの側面部8を表面部5と裏面部6とに平行になるようにしている。そして、側面部8の前記平行な2両側面は、光を導く入射端面部7(7a,7b)を形成している。すなわち、図2(a),(b)に示す第2の導光体2Aは、表面部5の互いに向き合う2両端の傾斜面部5bの端面が表面部5と裏面部6に平行な2つの入射端面部7a,7bを形成している。   As shown in FIGS. 2A and 2B, the second light guide 2 (2A) has a flat portion 5a having a large surface portion 5. This 2nd light guide 2A forms the inclined surface part 5b which inclines 2 both ends of the surface part 5 toward the back surface part 6, and the four side surface parts 8 (light guide) which the surface part 5 and the back surface part 6 connect. Of the body 2A), the two side surface portions 8 facing each other are parallel to the front surface portion 5 and the back surface portion 6. The two parallel side surfaces of the side surface portion 8 form incident end surface portions 7 (7a, 7b) for guiding light. That is, the second light guide 2A shown in FIGS. 2A and 2B has two incident surfaces in which the end surfaces of the inclined surface portions 5b at the two opposite ends of the surface portion 5 are parallel to the surface portion 5 and the back surface portion 6. End face portions 7a and 7b are formed.

また、第2の導光体2(2B)は、図3(a),(b)に示す様に、表面部5が大きな平坦部5aを有している。この第2の導光体2Bは、表面部5の外周全4端を裏面部6方向に傾斜する傾斜面部5bを形成し、表面部5と裏面部6とが接続する側面部(導光体の厚さに相当)の4つの側面部を表面部5と裏面部6とに平行になるようにしている。そして、側面部の前記平行な全4側面は、光を導く入射端面部7(7a,7b,7c,7d)を形成している。すなわち、図3(a),(b)に示す第2の導光体2Bは、表面部5の外周全4端の傾斜面部5bの端面が表面部5と裏面部6に平行な4つの入射端面部7a,7b,7c,7dを形成している。   Further, as shown in FIGS. 3A and 3B, the second light guide 2 (2B) has a flat portion 5a having a large surface portion 5. This 2nd light guide 2B forms the inclined surface part 5b which inclines the outer periphery all four ends of the surface part 5 toward the back surface part 6, and the side surface part (light guide body) which the surface part 5 and the back surface part 6 connect. The four side surface portions are equivalent to the front surface portion 5 and the back surface portion 6. And all the four parallel side surfaces of the side surface portion form incident end surface portions 7 (7a, 7b, 7c, 7d) for guiding light. That is, the second light guide 2B shown in FIGS. 3A and 3B has four incident surfaces in which the end surfaces of the inclined surface portions 5b at all four ends of the outer periphery of the surface portion 5 are parallel to the surface portion 5 and the back surface portion 6. End surface portions 7a, 7b, 7c, and 7d are formed.

尚、これら表面部5の平坦部5aと傾斜面部5bとの境および裏面部6の平坦部6aと傾斜面部6bとの境は、丸みをおびた曲面を形成しており、境として認識できない様にしてある。
また、これら入射端面部7aの幅および入射端面部7bの幅や入射端面部7cの幅および入射端面部7dの幅は、第1の導光体3の光が出射する出射面部の幅の略半分の大きさである。
The boundary between the flat portion 5a and the inclined surface portion 5b of the front surface portion 5 and the boundary between the flat portion 6a and the inclined surface portion 6b of the back surface portion 6 form a rounded curved surface and cannot be recognized as a boundary. It is.
The width of the incident end surface portion 7a, the width of the incident end surface portion 7b, the width of the incident end surface portion 7c, and the width of the incident end surface portion 7d are approximately the width of the exit surface portion from which the light from the first light guide 3 is emitted. It is half the size.

さらに、表面部5の平坦部5aや裏面部6の平坦部6aおよび表面部5の傾斜面部5bや裏面部6の傾斜面部6bには、光を全反射や屈折する光偏向素子11,12が必要に応じて形成されている。   Further, light deflecting elements 11 and 12 that totally reflect or refract light are provided on the flat portion 5 a of the front surface portion 5, the flat portion 6 a of the back surface portion 6, the inclined surface portion 5 b of the front surface portion 5, and the inclined surface portion 6 b of the back surface portion 6. It is formed as needed.

次に、第2の導光体2(2A,2B)の光の軌跡を図4を参照しながら説明する。
第2の導光体2(2A,2B)の入射端面部7から入射した光は、屈折角γが0≦|γ|≦Sin-1(1/n)の式を満たす範囲で導光体2A,2B内に進む。例えば一般の導光体2A,2Bに使用されている樹脂材料であるアクリル樹脂の屈折率nはn=1.49程度である。従って、最大入射角は、入射端面部7の傾斜面部5b方向から傾斜面部6b方向への光および傾斜面部6b方向から傾斜面部5b方向への光が入射角90°となる。これにより、入射端面部7で屈折する屈折角γは、γ=0〜±42°程度の範囲内になる。
但し、入射端面部7に対して垂直な直線をγ=0とし、各傾斜面部5b方向へγ=+42°、傾斜面部6b方向へγ=+42°の範囲に光線が存在する。
Next, the locus of light of the second light guide 2 (2A, 2B) will be described with reference to FIG.
The light incident from the incident end face portion 7 of the second light guide 2 (2A, 2B) is within the range where the refraction angle γ satisfies the expression 0 ≦ | γ | ≦ Sin −1 (1 / n). Proceed to 2A, 2B. For example, the refractive index n of acrylic resin, which is a resin material used for general light guides 2A and 2B, is about n = 1.49. Therefore, the maximum incident angle is 90 ° for the light from the inclined surface portion 5b direction to the inclined surface portion 6b direction and the light from the inclined surface portion 6b direction to the inclined surface portion 5b direction of the incident end surface portion 7. As a result, the refraction angle γ refracted at the incident end face portion 7 is in the range of γ = 0 to ± 42 °.
However, a straight line perpendicular to the incident end face portion 7 is γ = 0, and light rays exist in a range of γ = + 42 ° in the direction of each inclined surface portion 5b and γ = + 42 ° in the direction of the inclined surface portion 6b.

さらに、屈折角γ=0〜42°の範囲内で第2の導光体2A,2B内に入射した光は、第2の導光体2A,2Bと空気層(屈折率n=1)との境界面において、Sinα=(1/n)の式により臨界角を表わすことができる。例えば一般の導光体に使用されている樹脂材料であるアクリル樹脂の屈折率nはn=1.49程度であるので、臨界角αはα=42°程度になる。   Furthermore, the light that has entered the second light guides 2A and 2B within the range of the refraction angle γ = 0 to 42 ° is reflected between the second light guides 2A and 2B, the air layer (refractive index n = 1), and the like. The critical angle can be expressed by the equation Sinα = (1 / n). For example, since the refractive index n of acrylic resin, which is a resin material used for general light guides, is about n = 1.49, the critical angle α is about α = 42 °.

以上の様に、入射端面部7から入射した光は、0≦|γ|≦Sin-1(1/n)を満たす屈折率γの範囲γ=0〜±42°で第2の導光体2A,2B内を進み、また第2の導光体2(2A,2B)内と空気層(屈折率n=1)との境界面ではSinα=(1/n)で臨界角α=42°となる。従って、入射角が臨界角よりも大きな場合には全反射し、臨界角を破らない限り第2の導光体2A,2B内に閉じ込められ、第2の導光体2A,2B内から脱出できない。 As described above, the light incident from the incident end face portion 7 is the second light guide in the range γ = 0 to ± 42 ° of the refractive index γ satisfying 0 ≦ | γ | ≦ Sin −1 (1 / n). 2A, 2B, and at the boundary between the second light guide 2 (2A, 2B) and the air layer (refractive index n = 1), Sin α = (1 / n) and the critical angle α = 42 °. It becomes. Accordingly, when the incident angle is larger than the critical angle, the light is totally reflected and is confined in the second light guides 2A and 2B unless it breaks the critical angle, and cannot escape from the second light guides 2A and 2B. .

入射端面部7から入射した光線は、屈折角γの範囲γ=0°〜±42°で第2の導光体2A,2B内を進む。そして、真直ぐな光線L1は、表面部5の傾斜面部5bで全反射を行い、表面部5の傾斜面部5bに対しての入射角と同じ反射角で表面部5の平坦部5a方向に進む。この表面部5の平坦部5aに達した光線L2は、表面部5の平坦部5aに設けた光偏向素子11(ここでは凹形状)によって屈折して表面部5の平坦部5aから出射光L3として出射する。   A light ray incident from the incident end face portion 7 travels in the second light guides 2A and 2B within a refraction angle γ range γ = 0 ° to ± 42 °. The straight light ray L1 is totally reflected by the inclined surface portion 5b of the surface portion 5, and proceeds in the direction of the flat portion 5a of the surface portion 5 at the same reflection angle as the incident angle with respect to the inclined surface portion 5b of the surface portion 5. The light beam L2 reaching the flat portion 5a of the surface portion 5 is refracted by the light deflection element 11 (concave shape here) provided on the flat portion 5a of the surface portion 5, and is emitted from the flat portion 5a of the surface portion 5 to the outgoing light L3. To be emitted.

また、入射端面部7で屈折した±42°(ここでは左右方向)程度の光線の内表面部5の傾斜面部5b方向に進んだ光線Lrは、表面部5の傾斜面部5bに達して表面部5の傾斜面部5bに設けた光偏向素子12(ここでは凸形状)によって屈折して表面部5の傾斜面部5bから出射光Lr0として出射する。   Further, the light ray Lr which has been refracted by the incident end face part 7 and travels in the direction of the inclined surface part 5b of the inner surface part 5 of the light of about ± 42 ° (here, the left-right direction) reaches the inclined surface part 5b of the surface part 5 and reaches the surface part. 5 is refracted by the light deflection element 12 (convex shape in this case) provided on the inclined surface portion 5b, and is emitted from the inclined surface portion 5b of the surface portion 5 as emitted light Lr0.

同様に、入射端面部7の裏面部6の傾斜面部6b方向に屈折した±42°程度の光線LLは、裏面部6の傾斜面部6b方向へ進み、裏面部6の傾斜面部6bで全反射を行って反対側の表面部5の傾斜面部5bに達して表面部5の傾斜面部5bに設けた光偏向素子12(ここでは凸形状)によって屈折して表面部5の傾斜面部5bから出射光LL0として出射する。   Similarly, the light beam LL of about ± 42 ° refracted in the direction of the inclined surface portion 6b of the back surface portion 6 of the incident end surface portion 7 proceeds in the direction of the inclined surface portion 6b of the back surface portion 6 and is totally reflected by the inclined surface portion 6b of the back surface portion 6. Then, the light beam reaches the inclined surface portion 5b of the surface portion 5 on the opposite side and is refracted by the light deflecting element 12 (convex shape in this case) provided on the inclined surface portion 5b of the surface portion 5, and is emitted from the inclined surface portion 5b of the surface portion 5. To be emitted.

さらに、入射端面部7から入射した光線の一部は、表面部5の傾斜面部5bや裏面部の傾斜面部6bの鏡面部分で全反射をしながら進み、表面部5の平坦部5aや裏面部6の平坦部6aに達する。そして、裏面部6の平坦部6aに達した光線L4は再度全反射する。ここで、裏面部6の平坦部6aに設けた光偏向素子11(ここでは凹形状)に達した光線L41は、光偏向素子11によって全反射して裏面部6の平坦部6aから表面部5の平坦部5aに進み、光線L40として出射する。   Further, part of the light beam incident from the incident end surface portion 7 proceeds while being totally reflected by the mirror surface portions of the inclined surface portion 5b of the front surface portion 5 and the inclined surface portion 6b of the back surface portion, and the flat portion 5a and the back surface portion of the front surface portion 5. 6 reaches the flat portion 6a. And the light ray L4 which reached the flat part 6a of the back surface part 6 is totally reflected again. Here, the light beam L41 that has reached the light deflection element 11 (concave shape in this case) provided on the flat portion 6a of the back surface portion 6 is totally reflected by the light deflection element 11 and then from the flat portion 6a of the back surface portion 6 to the front surface portion 5. To the flat portion 5a and exit as a light ray L40.

尚、ここでは、図4を用いて左部分のみの光の軌跡について説明したが、右部分も同様な光の軌跡を得る。特に表面部5の平坦部5aからの出射光は、左右(ここでは図2に示す様に2つの入射端面部7aと、入射端面部7bから入射し、また図3に示す様に4つの入射端面部7a、入射端面部7b、入射端面部7c、入射端面部7dから入射する。)2つの入射端面部7から光を入射して、両方の出射端面部7からの光を表面部5の平坦部5aで出射する。   Here, the light trajectory of only the left portion has been described with reference to FIG. 4, but a similar light trajectory is also obtained for the right portion. In particular, light emitted from the flat portion 5a of the surface portion 5 is incident on the left and right sides (here, two incident end face portions 7a and an incident end face portion 7b as shown in FIG. 2 and four incident lights as shown in FIG. 3). The light is incident from the end surface portion 7a, the incident end surface portion 7b, the incident end surface portion 7c, and the incident end surface portion 7d.) Light is incident from the two incident end surface portions 7, and the light from both the output end surface portions 7 is incident on the surface portion 5. The light is emitted from the flat portion 5a.

さらに、光偏向素子11や光偏向素子12の分布は、表面部5の平坦部5aから出射する輝度と表面部5の傾斜面部5bから出射する輝度とが同じになる様に表面部5の傾斜面部5b、裏面部6の傾斜面部6b、表面部5の平坦部5aおよび裏面部6の平坦部6aに設ける光偏向素子11および光偏向素子12の量をコントロールすることにより得ることができる。   Further, the distribution of the light deflection element 11 and the light deflection element 12 is such that the luminance of the surface portion 5 is inclined so that the luminance emitted from the flat portion 5a of the surface portion 5 and the luminance emitted from the inclined surface portion 5b of the surface portion 5 are the same. It can be obtained by controlling the amount of the light deflection element 11 and the light deflection element 12 provided on the surface portion 5b, the inclined surface portion 6b of the back surface portion 6, the flat portion 5a of the front surface portion 5 and the flat portion 6a of the back surface portion 6.

尚、光偏向素子11,12は、球および楕円球の一部ならびに三角錘、円錐、四角錐、三角柱、四角柱、円柱等の内から表面部5の平坦部5aから最適な光が出射するように選択する。
例えば、表面部5の平坦部5aに設けた光偏向素子12の位置が図4の第2の導光体2の左寄りにある場合、もっと表面部5の平坦部5aの中心方向に出射しなければならない時に、凸形状の球の一部の円弧状面よりも屈折する出射面と成る面の角度が小さい三角錐や四角錐を用いて表面部5の平坦部5aに沿った出射光を得た方が良い場合もある。
The light deflection elements 11 and 12 emit optimal light from the flat portion 5a of the surface portion 5 from a part of a sphere and an elliptical sphere, a triangular pyramid, a cone, a quadrangular pyramid, a triangular prism, a quadrangular prism, and a cylinder. To choose.
For example, when the position of the light deflection element 12 provided on the flat portion 5a of the surface portion 5 is on the left side of the second light guide 2 in FIG. 4, it should be emitted further toward the center of the flat portion 5a of the surface portion 5. When it is necessary to obtain the emitted light along the flat portion 5a of the surface portion 5 using a triangular pyramid or a quadrangular pyramid having a smaller angle of the surface to be refracted than a part of the arcuate surface of the convex sphere. Sometimes it is better.

このように、光偏向素子11,12は、表面部5の平坦部5aからの必要な出射光の方向、輝度等およびこれらの組み合わせ等を選択する。これにより、第2の導光体2の入射端面部7a,7b,7c,7dからの全反射等で伝播した光を屈折させて偏向し、表面部5の平坦部5aの中央方向からの出射光によって第2の導光体2の平坦部5a全体から均一に出射することができる。   As described above, the light deflection elements 11 and 12 select the necessary direction of emitted light from the flat portion 5a of the surface portion 5, the luminance, the combination thereof, and the like. As a result, the light propagated by total reflection or the like from the incident end surface portions 7a, 7b, 7c, and 7d of the second light guide 2 is refracted and deflected, and is emitted from the central direction of the flat portion 5a of the surface portion 5. It can radiate | emit uniformly from the whole flat part 5a of the 2nd light guide 2 by incident light.

また、第2の導光体2は表面部5の平坦部5aと表面部5の傾斜面部5bとの境がなく表面部5の平坦部5aからの出射光と表面部5の傾斜面部5bからの出射光とが同等に出射されて傾斜面部5bを含めての全表面部5からの出射光が均一に出射される。   Further, the second light guide 2 has no boundary between the flat portion 5a of the surface portion 5 and the inclined surface portion 5b of the surface portion 5, and the emitted light from the flat portion 5a of the surface portion 5 and the inclined surface portion 5b of the surface portion 5. The emitted light from the entire surface portion 5 including the inclined surface portion 5b is emitted uniformly.

第1の導光体3は、図5に示すように、光源9からの光を導く細長い矩形形状をなした入射面部36と、この入射面部36の反対側に位置し、入射面部36の幅よりも広い幅を有して光源9からの光を出射する出射面部35と、これら入射面部36と出射面部35とを接続する細長い2つの傾斜側面37と、これら2つの傾斜側面37と入射面部36と出射面部35とを垂直に接続する2つの側面38とからなる。   As shown in FIG. 5, the first light guide 3 is positioned on the opposite side of the incident surface portion 36, which has a long and narrow rectangular shape for guiding light from the light source 9, and the width of the incident surface portion 36. A light emitting surface 35 that emits light from the light source 9 with a wider width, two slender inclined side surfaces 37 that connect the incident surface portion 36 and the light emitting surface portion 35, and the two inclined side surfaces 37 and the incident surface portion. 36 and two side surfaces 38 that vertically connect the emission surface portion 35.

また、第1の導光体3は、出射面部35の幅を第2の導光体2の入射端面部7aの幅および入射端面部7bの幅や入射端面部7cの幅および入射端面部7dの幅の略倍の大きさである。
但し、第1の導光体3の長さは、第2の導光体2の長さと等しい。
Further, the first light guide 3 has a width of the exit surface 35 that is equal to the width of the incident end face 7a and the width of the incident end face 7b, the width of the incident end face 7c, and the incident end face 7d of the second light guide 2. Is approximately twice as large as the width of.
However, the length of the first light guide 3 is equal to the length of the second light guide 2.

さらに、第1の導光体3の光の軌跡を図6を参照しながら説明する。
第2の導光体2(2A,2B)でも説明したように、第1の導光体3の入射面部36から入射した光は、屈折角γが0≦|γ|≦Sin-1(1/n)の式を満たす範囲で導光体3内に進む。例えば一般の導光体3に使用されている樹脂材料であるアクリル樹脂の屈折率nはn=1.49程度であるので、最大入射角は90°となる。従って、入射面部36で屈折する屈折角γは、γ=0〜±42°程度の範囲内になる。
但し、入射面部36に対して垂直な直線をγ=0とし、各傾斜側面37方向の右方向へγ=+42°、傾斜側面37の左方向へγ=+42°の範囲に光線が存在する。
Further, the locus of light of the first light guide 3 will be described with reference to FIG.
As described in the second light guide 2 (2A, 2B), the light incident from the incident surface portion 36 of the first light guide 3 has a refraction angle γ of 0 ≦ | γ | ≦ Sin −1 (1 / N) is advanced into the light guide 3 within a range satisfying the equation. For example, since the refractive index n of an acrylic resin, which is a resin material used for the general light guide 3, is about n = 1.49, the maximum incident angle is 90 °. Therefore, the refraction angle γ refracted at the incident surface portion 36 is in the range of γ = 0 to ± 42 °.
However, a straight line perpendicular to the incident surface portion 36 is γ = 0, and there is a light beam in a range of γ = + 42 ° to the right of each inclined side surface 37 and γ = + 42 ° to the left of the inclined side surface 37.

また、屈折角γ=0〜±42°の範囲内で第1の導光体3内に入射した光は、第1の導光体3と空気層(屈折率n=1)との境界面において、Sinα=(1/n)の式により臨界角を表わすことができる。例えば一般の導光体に使用されている樹脂材料であるアクリル樹脂の屈折率nはn=1.49程度であるので、臨界角αはα=42°程度になる。   In addition, the light incident on the first light guide 3 within the range of the refraction angle γ = 0 to ± 42 ° is the boundary surface between the first light guide 3 and the air layer (refractive index n = 1). The critical angle can be expressed by the equation Sinα = (1 / n). For example, since the refractive index n of acrylic resin, which is a resin material used for general light guides, is about n = 1.49, the critical angle α is about α = 42 °.

第1の導光体3の入射面部36から入射した真直ぐな光線L13は、入射面部36や出射面部35で屈折せずに直接出射面部35から光線L130を出射する。
尚、出射面部35に対し多少の入射角を有する光線は概略出射面部35から多少の屈折をした出射角で出射する。
The straight light beam L13 incident from the incident surface portion 36 of the first light guide 3 is directly refracted by the incident surface portion 36 and the output surface portion 35 and is directly emitted from the output surface portion 35.
A light beam having a slight incident angle with respect to the light emission surface portion 35 is emitted from the light emission surface portion 35 with a light beam that is slightly refracted.

部36で屈折した±42°(ここでは左右方向)程度の光線の内傾斜側面37の左方向に進んだ光線Lr3は、左側の傾斜側面37で全反射をして入射角に等しい反射角で光線Lr31として出射面部35方向に進み、出射面部35でやや屈折して光線Lr30として出射する。 The light beam Lr3 that has been refracted by the portion 36 and travels to the left of the inner inclined side surface 37 of a light beam of about ± 42 ° (here, in the left-right direction) undergoes total reflection at the left inclined side surface 37 and has a reflection angle equal to the incident angle. The light beam Lr31 travels in the direction of the emission surface portion 35, and is slightly refracted by the emission surface portion 35 to be emitted as a light beam Lr30.

同様に入射面部36で±42°に屈折した光線の内傾斜側面37の右方向に進んだ光線LL3は、左側の傾斜側面37で全反射をして入射角に等しい反射角で光線LL31として出射面部35方向に進み、出射面部35でやや屈折して光線LL30として出射する。   Similarly, a light beam LL3 that has been refracted by ± 42 ° at the incident surface portion 36 and proceeds to the right of the inner inclined side surface 37 is totally reflected by the left inclined side surface 37 and is emitted as a light beam LL31 at a reflection angle equal to the incident angle. Proceeding in the direction of the surface portion 35, the light is slightly refracted by the emission surface portion 35 and emitted as a light beam LL30.

尚、出射面部35や2つの傾斜側面37および2つの側面38に第2の導光体2に設けた光偏向素子11や光偏向素子12を設けても良い。   Note that the light deflection element 11 and the light deflection element 12 provided in the second light guide 2 may be provided on the emission surface portion 35, the two inclined side surfaces 37, and the two side surfaces 38.

この第1の導光体3の出射面部35からの出射光は、第2の導光体2Aの入射端面部7aおよび入射端面部7bや第2導光体2Bの入射端面部7aおよび入射端面部7bならびに入射端面部7cおよび入射端面部7dに向かい、出射光の全てをこれらに入射する。   Light emitted from the exit surface portion 35 of the first light guide 3 is incident on the incident end surface portion 7a and the incident end surface portion 7b of the second light guide 2A or the incident end surface portion 7a and the incident end surface of the second light guide 2B. All of the outgoing light is incident on the portion 7b, the incident end face portion 7c, and the incident end face portion 7d.

光源9は、冷陰極管(CCFL)等からなり、これらは第1の導光体3の入射面部36に対応する長さの線状をなし、直接光は第1の導光体3の入射面部36から導光体3内に入射し、他の光は図示しないリフレクタで反射されながら光源9とリフレクタとの空間を通って第1の導光体3内に入射する。
また、光源9としては、半導体発光素子であって、LEDやレーザ等からなり、RGB(赤色発光、緑色発光、青色発光)からなる複数の半導体発光素子を組み合わせたアレー状に構成したユニットを入射面部36近傍に設けても良い。
The light source 9 is formed of a cold cathode tube (CCFL) or the like, which has a linear shape corresponding to the incident surface portion 36 of the first light guide 3, and direct light is incident on the first light guide 3. The light enters the light guide 3 from the surface 36 and other light enters the first light guide 3 through the space between the light source 9 and the reflector while being reflected by a reflector (not shown).
In addition, the light source 9 is a semiconductor light emitting element, which is composed of an LED, a laser, or the like, and is incident on a unit configured in an array shape including a plurality of semiconductor light emitting elements composed of RGB (red light emission, green light emission, blue light emission). You may provide in the surface part 36 vicinity.

尚、従来の平面照明装置では、光源からの光を導光体から直ぐに出射光を出射するために輝度の斑や虹の発生があるが、本発明のように光源からの光を一度、第1の導光体3で第2の導光体2に対応した光を出射し、この出射光を第2の導光体2によりさらに広がりを持った均一な光を出射することができる。   Incidentally, in the conventional flat illumination device, since the light from the light source is emitted from the light guide body immediately to emit the emitted light, there is generation of brightness spots and rainbows. One light guide 3 emits light corresponding to the second light guide 2, and the emitted light can be emitted by the second light guide 2 so that the light further spreads out.

反射体10は、反射面が凹凸形状またはプリズム形状を成し、熱可塑性樹脂に例えば酸化チタンのような白色材料を混入したシートや熱可塑性樹脂のシートにアルミニウム等の金属蒸着を施したり、金属箔を積層した物やシート状金属からなる。この反射体10は、第1の導光体3の入射面部36と出射面部35以外の部分を覆い、光源9からの光が第1の導光体3によって出射面部35に出射した以外の光を反射または乱反射し、再び第1の導光体3に入射させて光源9からの光を全て出射面部35から出射する。   The reflector 10 has a reflective surface with an uneven shape or a prism shape, and a metal such as aluminum is deposited on a sheet of a thermoplastic resin mixed with a white material such as titanium oxide or a sheet of a thermoplastic resin. It consists of a laminate of foil or sheet metal. The reflector 10 covers portions other than the entrance surface portion 36 and the exit surface portion 35 of the first light guide 3, and light other than light emitted from the light source 9 to the exit surface portion 35 by the first light guide 3. Is reflected or diffusely reflected, and again incident on the first light guide 3, and all the light from the light source 9 is emitted from the emission surface portion 35.

さらに、反射体10は、反射面が凹凸形状またはプリズム形状であるので、光源9がRGB等の三原色光の光をプリズム面による反射によって第1の導光体3内で混ざり合うことができ、光源9からの光を無駄にせず光源9から導光体2の出射光に変換する効率を良くすることができる。   Further, since the reflecting surface of the reflector 10 has an uneven shape or a prism shape, the light source 9 can mix light of three primary colors such as RGB in the first light guide 3 by reflection by the prism surface, The efficiency of converting light from the light source 9 into light emitted from the light source 9 can be improved without wasting it.

また、ここでは図示しないが、平面照明装置1として第2の導光体2の表面部の上方にプリズムシートを用いても良い。この時プリズムシートのプリズム面(プリズムの稜)を導光体2に向ける。これにより、第2の導光体2に沿った様な出射光がある場合、出射光を一度プリズムシート内に取り込み、取り込んだ面と反対側の面で全反射をし、最終的に平面照明装置1から略垂直な出射光を得ることができる。   Although not shown here, a prism sheet may be used above the surface portion of the second light guide 2 as the flat illumination device 1. At this time, the prism surface (prism ridge) of the prism sheet is directed to the light guide 2. Thereby, when there is outgoing light along the second light guide 2, the outgoing light is once taken into the prism sheet, totally reflected on the surface opposite to the taken-in surface, and finally planar illumination A substantially vertical outgoing light can be obtained from the apparatus 1.

ところで、上述した実施の形態では、第2の導光体2の入射端面部7に出射面部35が位置するように第1の導光体3が設けられた構成について説明したが、反射体10を第1の導光体3として用いることもできる。この場合の反射体10は、第2の導光体2の2つの入射端面部7の幅と略一致するように開口幅が設定される。これにより、光源9からの光は、反射体10の開口より2つの第2の導光体2の2つの入射端面部(例えば7a,7b)より入射される。   In the above-described embodiment, the configuration in which the first light guide 3 is provided so that the emission surface 35 is located on the incident end surface 7 of the second light guide 2 has been described. Can also be used as the first light guide 3. In this case, the opening width of the reflector 10 is set so as to substantially match the width of the two incident end face portions 7 of the second light guide 2. Thereby, the light from the light source 9 enters from the two incident end surface portions (for example, 7a and 7b) of the two second light guides 2 from the opening of the reflector 10.

このように、本発明の導光体を含む平面照明装置は、線状の光源9と、この光源9からの光を第1の導光体3の入射面部36から導き、この第1の導光体3の入射面部36よりも広い幅を有し、光源9からの光を出射する出射面部35と、入射面部36と出射面部35とを接続する2つの傾斜面部37で入射面部36から入射した光の内大きく屈折された光を全反射して出射面部35方向に導き出射面部35から略垂直な光を出射し、この第1の導光体3の出射面部35の幅の略半分の幅を有した第2の導光体2の入射端面部7により、この第1の導光体3からの出射光を複数の第2の導光体2の入射端面部7から導き、第2の導光体2の表面部5の2両端または4端を裏面部6方向に傾斜させて、第2の導光体2の本来の側面部を表面部5と裏面部6とに平行にして得た入射端面部7に入射した光は表面部5側に傾斜した傾斜面部5bや裏面部6側に傾斜した傾斜面部6bで全反射を繰り返しながら第2の導光体2の表面部5の大きな平坦部5aに導き、この平坦部5aに設けた光偏向素子11や光偏向素子12によって外部に出射する。
また、表面部5側に傾斜した傾斜面部5bにも光偏向素子11や光偏向素子12を設けることにより傾斜面部5bからも光を出射することができ、表面部5の大きな平坦部5aと表面部5の傾斜面部5bとから等しく均一な光を出射することができる。
As described above, the flat illumination device including the light guide of the present invention guides the linear light source 9 and the light from the light source 9 from the incident surface portion 36 of the first light guide 3, and this first guide. The incident surface portion 36 is wider than the incident surface portion 36 of the light body 3, and is incident from the incident surface portion 36 by an exit surface portion 35 that emits light from the light source 9, and two inclined surface portions 37 that connect the incident surface portion 36 and the exit surface portion 35. The light that has been largely refracted is totally reflected and guided in the direction of the exit surface 35 to emit light substantially perpendicular to the exit surface 35, and is approximately half the width of the exit surface 35 of the first light guide 3. By the incident end surface portion 7 of the second light guide body 2 having a width, the emitted light from the first light guide body 3 is guided from the incident end surface portions 7 of the plurality of second light guide bodies 2, and second The two side ends or the four ends of the surface portion 5 of the light guide 2 are inclined toward the back surface portion 6 so that the original side surface portion of the second light guide 2 is the surface portion 5. The light incident on the incident end surface portion 7 obtained in parallel with the back surface portion 6 is subjected to the second guide while repeating total reflection at the inclined surface portion 5b inclined to the front surface portion 5 side and the inclined surface portion 6b inclined to the back surface portion 6 side. The light is guided to a large flat portion 5a on the surface portion 5 of the light body 2, and is emitted to the outside by the light deflection element 11 and the light deflection element 12 provided on the flat portion 5a.
Further, by providing the light deflection element 11 and the light deflection element 12 also on the inclined surface portion 5b inclined to the surface portion 5 side, light can be emitted from the inclined surface portion 5b, and the large flat portion 5a and the surface of the surface portion 5 can be emitted. Equal and uniform light can be emitted from the inclined surface portion 5b of the portion 5.

(a)本発明に係る導光体を含む平面照明装置の略斜視構成図である。 (b)同平面照明装置の側面図である。(A) It is a schematic perspective view of a flat illumination device including a light guide according to the present invention. (B) It is a side view of the same plane illuminating device. (a)本発明に係る導光体の略斜視図である。 (b)同導光体の側面図である。(A) It is a schematic perspective view of the light guide which concerns on this invention. (B) It is a side view of the light guide. (a)本発明に係る導光体の略斜視図である。 (b)同導光体の側面図である。(A) It is a schematic perspective view of the light guide which concerns on this invention. (B) It is a side view of the light guide. 本発明に係る導光体の軌跡図である。It is a locus diagram of the light guide according to the present invention. 本発明に係る導光体の略斜視図である。1 is a schematic perspective view of a light guide according to the present invention. 本発明に係る導光体の軌跡図である。It is a locus diagram of the light guide according to the present invention.

符号の説明Explanation of symbols

1 平面照明装置
2(2A,2B),3 導光体
5 表面部
5a 表面平坦部
5b 表面側傾斜面部
6 裏面部
6a 裏面平坦部
6b 裏面側傾斜面部
7(7a,7b,7c,7d) 入射端面部
8 側面部
9 光源
10 反射体
11,12 光偏向素子
35 出射面部
36 入射面部
37 傾斜側面
38 側面
γ 屈折角
n 屈折率
α 臨界角
L1,L2,L3,L4,LL,Lr,LL1,Lr0,LL0,L41,L40,L13,LL3Lr3,LL30,L130Lr30 光線
DESCRIPTION OF SYMBOLS 1 Planar illumination apparatus 2 (2A, 2B), 3 Light guide 5 Surface part 5a Surface flat part 5b Surface side inclined surface part 6 Back surface part 6a Back surface flat part 6b Back surface side inclined surface part 7 (7a, 7b, 7c, 7d) Incident End surface portion 8 Side surface portion 9 Light source 10 Reflector 11, 12 Light deflection element 35 Output surface portion 36 Entrance surface portion 37 Inclined side surface 38 Side surface γ Refraction angle n Refractive index α Critical angle L1, L2, L3, L4, LL, Lr, LL1, Lr0, LL0, L41, L40, L13, LL3Lr3, LL30, L130Lr30

Claims (3)

光の出射方向に位置する表面部と、前記表面部の反対方向に位置する裏面部と、前記表面部と前記裏面部とに接続する側面部を有する導光体であって、
前記表面部は平坦部と2両端を前記裏面部方向に傾斜させた傾斜面とから成り、前記側面部を前記表面部の前記平坦部に平行にし、この平行な2つの前記側面部を、光を導く入射端面部とし、前記表面部の前記平坦部と前記傾斜面とから光を出射することを特徴とする導光体。
A light guide having a front surface portion located in the light emitting direction, a back surface portion located in the opposite direction of the front surface portion, and a side surface portion connected to the front surface portion and the back surface portion;
The surface portion is composed of a flat portion and an inclined surface in which both ends are inclined toward the back surface portion, the side surface portion is made parallel to the flat portion of the surface portion, and the two parallel side surface portions are optically The light guide is characterized in that light is emitted from the flat portion and the inclined surface of the surface portion.
光の出射方向に位置する表面部と、前記表面部の反対方向に位置する裏面部と、前記表面部と前記裏面部とに接続する側面部を有する導光体であって、
前記表面部は平坦部と4端を前記裏面部方向に傾斜させた傾斜面とから成り、前記側面部を前記表面部の前記平坦部に平行にし、この平行な4つの前記側面部を、光を導く入射端面部とし、前記表面部の前記平坦部と前記傾斜面とから光を出射することを特徴とする導光体。
A light guide having a front surface portion located in the light emitting direction, a back surface portion located in the opposite direction of the front surface portion, and a side surface portion connected to the front surface portion and the back surface portion;
The front surface portion includes a flat portion and an inclined surface having four ends inclined toward the back surface portion. The side surface portion is parallel to the flat portion of the front surface portion, and the four parallel side surface portions are optically coupled. The light guide is characterized in that light is emitted from the flat portion and the inclined surface of the surface portion.
光を屈折および全反射する光偏向素子を、前記傾斜面を含む前記表面部および前記裏面部に設けることを特徴とする請求項1または請求項2記載の導光体。 3. The light guide according to claim 1, wherein a light deflecting element that refracts and totally reflects light is provided on the front surface portion and the back surface portion including the inclined surface.
JP2006315813A 2006-11-22 2006-11-22 Light guide Expired - Fee Related JP4295782B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104154463A (en) * 2010-09-27 2014-11-19 北京京东方光电科技有限公司 Light emitting diode source and manufacturing method thereof and backlight source with light emitting diode source
KR20150144847A (en) * 2014-06-17 2015-12-29 엘지디스플레이 주식회사 Backlight unit and display device having the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104154463A (en) * 2010-09-27 2014-11-19 北京京东方光电科技有限公司 Light emitting diode source and manufacturing method thereof and backlight source with light emitting diode source
KR20150144847A (en) * 2014-06-17 2015-12-29 엘지디스플레이 주식회사 Backlight unit and display device having the same
KR102163600B1 (en) * 2014-06-17 2020-10-12 엘지디스플레이 주식회사 Backlight unit and display device having the same

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