JPH06123885A - Surface light source device - Google Patents

Surface light source device

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Publication number
JPH06123885A
JPH06123885A JP4296666A JP29666692A JPH06123885A JP H06123885 A JPH06123885 A JP H06123885A JP 4296666 A JP4296666 A JP 4296666A JP 29666692 A JP29666692 A JP 29666692A JP H06123885 A JPH06123885 A JP H06123885A
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JP
Japan
Prior art keywords
surface
light source
light guide
side
waveform
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Pending
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JP4296666A
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Japanese (ja)
Inventor
Kazuaki Yokoyama
和明 横山
Original Assignee
Enplas Corp
株式会社エンプラス
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Application filed by Enplas Corp, 株式会社エンプラス filed Critical Enplas Corp
Priority to JP4296666A priority Critical patent/JPH06123885A/en
Priority claimed from DE1992617177 external-priority patent/DE69217177T2/en
Publication of JPH06123885A publication Critical patent/JPH06123885A/en
Application status is Pending legal-status Critical

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Abstract

PURPOSE: To obtain the surface light source device which uses a photoconductor having a uniform luminance distribution by forming the back surface of the photoconductor, i.e., the opposite surface to a projection surface into wavy uneven surface so that the uneven surface is continuously formed with curved surfaces or curved surfaces and planes in any directions continuously, and roughly finishing the surface.
CONSTITUTION: The surface light source device includes the photoconductor 2 having the reverse surface 2b in the wavy shape as shown in the figure. Further, the waveform is successive not only in section perpendicular to an incidence end surface 2a as shown in the figure, but also in different section of a plane perpendicular to the surface 2c, e.g. section parallel to the incidence end surface 2a or section slanting to the incidence end surface 2a. The back surface 2b of the photoconductor is therefore a continuous surface formed of curved surfaces or planes and curved surfaces in combination and includes none of a part like the apex angle of a cone, a linear part like a ridge, etc. Then, the curved surfaces of this waveform surface are roughly finished by forming what is called crimps.
COPYRIGHT: (C)1994,JPO&Japio

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、導光体を用いた面光源装置に関するものである。 The present invention relates to relates to a surface light source device using a light guide.

【0002】 [0002]

【従来の技術】従来の導光体を用いた面光源装置は、例えば図11に示すような構成である。 BACKGROUND OF THE INVENTION surface light source device using a conventional light guide is, for example, a configuration as shown in FIG. 11. 即ち、光源21にその入射端面22aを近接させて導光体22を配置し、 That is, the incident end face 22a is brought close to place the light guide 22 to the light source 21,
この導光体22の出射面側には拡散板23を又導光体2 Matashirube the light 2 diffusion plate 23 on the emission surface side of the light guide member 22
2の前記出射面と対向する側には反射面24を設けたものである。 On the side facing the second said exit surface is provided with a reflective surface 24. このような装置によれば、光源21よりの光は、入射端面22aより導光体22内に入射し、その内部を伝達する間に導光体22の出射面より出射し、この出射した光は、拡散板23を通って拡散光となる。 According to such a device, optical light from the light source 21 is incident from the light guide 22 entrance end face 22a, and output from the output surface of the light guide body 22 while transmitting the interior, that the emitted becomes diffused light passes through the diffusion plate 23. これによって面光源を構成することになる。 This constitutes the surface light source.

【0003】このような面光源装置は、導光体22に入射した光が、効率良く出射し又拡散板面上で均一輝度分布の拡散光となるように、導光体22の前記出射面と対向する側の面には拡散性の塗料による印刷等の手段で一定のパターン形状の微小拡散部を形成するのが一般的である。 Such a surface light source device, light introduced into the light guide 22 is efficiently emitted to also to have a uniform luminance distribution of diffused light on the diffuser surface, the exit surface of the light guide body 22 it is common on the surface of the opposite side to form a small diffusing portion of the predetermined pattern shape by a means such as printing by diffusion of the coating with.

【0004】このような面光源装置は、例えば、液晶表示装置のバックライト等に利用されるため、明るい面光源が要求される。 [0004] Such a surface light source device, for example, to be used in a backlight of a liquid crystal display device, a bright surface light source is required. しかし前記のような構成の従来の面光源装置は、十分な明るさを得ることが出来ない。 However conventional surface light source device configured as described above, it can not be obtained a sufficient brightness.

【0005】そのために、この種の面光源装置において、明るさを増大させるために色々な工夫がなされている。 [0005] Therefore, in this type of surface light source device, and various contrivances are made to increase the brightness.

【0006】例えば、特開平3−189679号公報や、実開平3−31782号公報に記載の面光源装置がある。 [0006] For example, JP-A-3-189679, there is a surface light source device according to the real-Open 3-31782 JP. この面光源装置は、導光体の前記出射面側と対向する側の面に角錐状の凸部または凹部を多数形成することによって輝度の増大をはかり又この角錐状の凸部または凹部の面積を場所により変化させるようにして輝度の均一化をはかっている。 The surface light source device, the area of ​​the scale also projections or recesses of the pyramidal an increase in brightness by many forms of pyramidal projections or recesses on the surface of the emission surface side opposite to the side of the light guide It is trying to improve the uniformity of brightness as varied by location.

【0007】しかしこのような方法では、角錐の面の面積が比較的広いため明るさを増大させることは出来るが、面積を変化させても輝度分布を十分均一にすることは困難であった。 [0007] However, in this method, but it can increase the area relatively large because the brightness of the faces of the pyramid, it was difficult to be varied area a sufficiently uniform luminance distribution. 又凸部または凹部が角錐状であるために角の部分(鋭い角になった部分等)が特に光る等の欠点がある。 Matatotsu or recess there is a disadvantage of such a corner portion (sharp corners since portions etc.) shines particularly because of the pyramid shape.

【0008】以上のような欠点を解消するために本出願の出願人が先に出願した平成4年実用新案登録願第24 [0008] 4-year Heisei applicant of the present application in order to overcome the disadvantages as described above has been filed earlier utility model registration Application No. 24
601号及び平成4年実用新案登録願第24608号の面光源装置がある。 There are 601 No., and 1992 Utility Model Registration Application No. 24608 of the surface light source device. それは夫々図12乃至図15および図16乃至図19に示す構成である。 It has a configuration shown in each of FIGS. 12 to 15 and 16 to 19.

【0009】まず図12乃至図15に示す面光源装置は、導光体22の出射側の面と反対側の面22aに球面状の凹部25や球面状凸部26を設けたものや、円筒状の凹部25'や円筒状の凸部を有するもので、これによって明るさを増加させることが出来又、これら凹部又は凸部を粗面とすることによって輝度を均一にすることが出来る。 [0009] First, FIG. 12 to the surface light source device shown in FIG. 15, or those having a spherical concave portion 25 and spherical protruding portion 26 on a surface opposite to the surface 22a of the emission side of the light guide body 22, a cylindrical those having a convex portion shaped for the recess 25 'and cylindrical, whereby it is possible to increase the brightness also can be made uniform luminance by the recesses or protrusions rough surface.

【0010】又図16に示す面光源装置は、同様に導光体22の下面22aに凹部又は凸部を設けたもので、これによって明るさを増加させると共にこれら凹部又は凸部に粗面を形成しこの粗面の粗さで変化させ出射面全体にわたってより均一な輝度分布が得られるようにしている。 [0010] The surface light source device shown in Matazu 16, likewise those in which a concave or convex portion on the lower surface 22a of the light guide body 22, a rough surface recesses or protrusions with which the increasing brightness forming a more uniform luminance distribution over the entire emitting surface is changed by the roughness of the rough surface is to be obtained. 又図17乃至図19に示すように凹部、凸部のピッチを変化させ、あるいは凹部の深さ又は凸部の高さを変化させて出射面全体にわたってより均一な輝度分布が得られるようにしたものである。 Matazu 17 through recess, as shown in FIG. 19, and so to change the pitch of the convex portions, or more uniform brightness distribution across the exit surface by changing the depth or height of the convex portion of the concave portion is obtained it is intended.

【0011】 [0011]

【発明が解決しようとする課題】このような図12乃至図19に示す導光体は、、凹部、凸部がいずれも断面が角状部分を含んでおり、このような角状部分は、他の部分に比べて明るくなり部分的に輝いて見える。 BRIEF Problem to be Solved] Such 12 to the light guide member shown in FIG. 19 ,, recess, even protrusions any cross section includes a corner-shaped portion, such angular portions, look bright become partially shining as compared to the other part. 又導光体の凸部又は凹部を有する面は平面に多数の凸部又は凹部が形成された形状であるため、導光体を薄くした時には拡散板側よりこの凸部又は凹部が明瞭に見えそのために拡散板を通してもこれが見え好ましくない。 Since the surface having a convex portion or concave portion of the Matashirube the light has a shape which is a number of projections or recesses formed in a plane, clearly visible that the projections or recesses from the diffuser side when thin light guide This undesirable visible even through the diffusion plate for this purpose.

【0012】 [0012]

【課題を解決するための手段】本発明の面光源装置は、 The surface light source device of SUMMARY OF THE INVENTION The present invention,
光源と、この光源にその入射端面を近接させて配置した導光体と、導光体の表面側(出射面側)に配置した拡散板と、導光体の裏面側(拡散板側と反対側)に配置した反射面とで構成したもので、導光体の裏面(出射面とは反対側の面)を波形の多数の凹凸面としたもので、この波形の凹凸がいずれの方向においても曲面又は曲面と平面とによって連続して形成されていて点又は線状をなす部分の存在しない形状としたことを特徴とし、更にこの波形の裏面を所謂しぼを形成する等の粗面として、波形とあわせて輝度の均一化をはかっている。 Conversely a light source, its and the incident end face as close to the arranged light guide to the light source, a diffusion plate disposed on the surface side of the light guide (exit surface side), the back surface side of the light guide body (diffuser plate side which was constituted by a reflecting surface disposed on the side), the back surface of the light guide body (surface opposite to the emission surface) obtained by a number of uneven surface of the waveforms, the unevenness any direction of the waveform as rough surface, such that also characterized in that a non-existent shape of the portion forming a curved surface or curved and continuously points have been formed or linear by the plane, further backside of the waveform to form a so-called grain, It is trying to improve the uniformity of brightness in conjunction with the waveform.

【0013】このように本発明の面光源装置は、導光体の裏面が連続した波形をなすためこの波形の面での光の反射や屈折作用によって明るい面光源を得ることが可能であると共に、この面上の各部分での方向(接平面の傾き)の変化が連続しているために、拡散光の輝度分布が拡散板面全体で均一である上に部分的にも急激な輝度変化がなく局部的に輝くこともない良好な輝度分布になし得る。 [0013] with such a surface light source device of the present invention, the back surface of the light guide it is possible to obtain a bright surface light source by reflecting and refracting action of light in terms of the waveform for forming a continuous waveform , because of continuous change of the direction (inclination of the tangent plane) at each portion on the surface, partially rapidly even brightness change on the luminance distribution of the diffused light is uniform across the diffuser surface can no even no good luminance distribution localized shine without. 又導光体が透明であり更に裏面が連続面であるので平面でなくとも波形が表面側から見えることはない。 Since Matashirube light body is transparent more back surface is a continuous surface never waveform is visible from the surface side without a plan.

【0014】更に裏面の波形の面を粗面にする場合、裏面が連続面であるため面全体として所望の粗面にすることが加工上容易である。 [0014] When further the surface of the rough surface of the rear surface of the wave, it is easy on the work to a desired rough surface as a whole surface for the rear surface is a continuous surface.

【0015】 [0015]

【実施例】次に本発明の面光源装置の実施例を図面にもとづき説明する。 EXAMPLES Next, based embodiments of the surface light source device of the present invention with reference to the drawings will be described.

【0016】図1は本発明の面光源装置の断面図で、1 [0016] Figure 1 is a sectional view of a surface light source device of the present invention, 1
は光源、2は導光体、3は拡散板、4は反射面である。 A light source, 2 is the light guide, 3 the diffusion plate, 4 is a reflecting surface.
この実施例の面光源装置は、導光体2の裏面2bが図示するような波形をなしている。 The surface light source device of this embodiment, the back surface 2b of the light guide 2 is formed into a waveform as shown. しかもこの波形の面は、 Moreover surface of this waveform,
図面では縦断面で入射端面に垂直な断面を示すが、表面2cに垂直な断面形状がその垂直面の異なる断面例えば入射端面2aに平行な断面や入射端面2aと傾いた断面においてもすべてが連続した波形であって、したがって導光体の裏面2bは、全ての部分において曲面又は平面と曲面とを組み合わせた面で連続した面であって、例えば錐形状の頂角のような部分や稜線のような部分などが存在しない形状である。 Continuous Although the drawing shows a cross-section perpendicular to the incident end face in longitudinal section, also all in the cross-section the cross-sectional shape perpendicular to the surface 2c is inclined with a section parallel or incident end face 2a to the different cross-sectional eg incident end face 2a thereof vertical plane was a waveform, the back surface 2b of the light guide is therefore a continuous surface in terms of a combination of a curved or flat and curved surfaces in all parts, for example part or ridge line as apex angle of the cone-shaped a shape such as the absence moiety such as. 更にこの波形の曲面は粗面になっている。 In addition the curved surface of this waveform are roughened.

【0017】この実施例においては、光源1よりの光は、導光体2の入射端面2aより入射した後、表面2c [0017] In this embodiment, light from the light source 1 is incident from the incident end face 2a of the light guide 2, the surface 2c
および裏面2bにて夫々全反射し(その一部は表面より射出し又裏面より出た光は反射面にて反射される)入射端面2aとは反射側へ伝達されて行く。 And each total reflection at the back surface 2b (some of the light emitted from the light emission was also the backside from the surface is reflected by the reflecting surface) and the incident end face 2a gradually transmitted to the reflective side. ここで一部の光が表面2cより出射して拡散板3を通って拡散光となり面光源となる。 Wherein part of the light passes through the diffusion plate 3 is emitted from the surface 2c becomes become surface light source and diffused light.

【0018】この実施例では、裏面が波形面であるためここで全反射される光は、反射箇所により異なった方向に反射され、又裏面を通り反射面4で反射されて再度入射する光は、波形の面で夫々屈折され場所により異なった方向へ進む。 [0018] In this embodiment, light is totally reflected here because the back surface is corrugated surface is reflected in a direction different by the reflective portion, and the light incident again is reflected in as reflecting surfaces 4 a backside , proceed to different directions depending on the location are respectively refracted by the surface wave. この裏面2bの波形面の作用によって導光体の表面2cより射出する光は均一化されしかも明るい光となる。 Light emitted from the surface 2c of the light guide by the action of the corrugated surface of the back surface 2b becomes homogenized Moreover bright light. 更に波形の面を粗面としたことにより拡散作用が加えられ均一な輝度となる。 Further diffusion action by which the surface wave and the rough surface becomes uniform brightness it added.

【0019】ここで裏面が波形でありしかもすべての方向で連続しているので、この面による光の反射方向又は屈折されて表面へ向かう方向の場所により変化も連続的であるために部分的に輝度が大になることがなく、拡散板上で輝く部分の生ずることが全くない。 [0019] Since the continuous where the rear surface is a waveform moreover in all directions, in part by the direction of the location toward the reflection direction or refracted by the surface of the light due to the surface to change is continuous without brightness becomes large, there is no to result of partial shining in the diffusion plate. 又裏面を粗面にする場合、裏面の全ての部分が連続しているためすべての部分を均一な粗面とすることや場所により粗さを変化させる場合も比較的容易になし得る。 In the case where the rear surface is roughened, it is done relatively easily even when changing the or location by roughness to all parts for all parts of the back surface is continuous uniform rough surface.

【0020】図1では波形を同じ形状に記載してあるが、波形の形状や大きさによって各部分で光が反射又は屈折する方向が異なってくる。 [0020] Although in FIG. 1 waveforms are described in the same shape, it becomes different directions which light is reflected or refracted by each portion depending on the shape and size of the waveform. したがって本発明の照明装置においては、より均一な輝度分布で明るいものを得るために、実際には波の形状や大きさを場所により変化させている。 In the illumination device of the present invention are therefore brighter to get what a uniform luminance distribution, actually alter the location of the shape and size of the waves. 又面光源装置の用途によっても波形の大きさや形状の分布を異なるものにしている。 And the distribution of the size and shape of the waveform differs also depending on the application of Matamen light source device.

【0021】図2は波形の面の断面形状の一例を示す図である。 [0021] FIG. 2 is a diagram illustrating an example of sectional shape of the surface wave. 実験結果からこの図において、波の高さhが大である程、その波の上部の出射面における明るさが大になる。 In this Figure the experimental results, the more the height h of the wave is large, the brightness at the top of the exit surface of the wave becomes larger. 又波の波長に相当するfが小である程、その波形の上部の出射面における明るさが大になる。 Enough f that corresponds to the wavelength of Matanami is small, the brightness at the top of the exit surface of the waveform becomes large. 又波の形状としては、gの部分の傾き角を45°〜60°とした時が最も明るくそれよりも大または小になるにつれ暗くなる。 The shape of Matanami darkens as time that the inclination angle of the portion of the g and 45 ° to 60 ° is brightest large or small than.

【0022】一般に導光体を用いた面光源装置は、導光体の光源に近い側(入射端面に近い側)の出射光が比較的大であって、これより離れるにつれて次第に小になる。 [0022] Generally the surface light source device using a light guide, a relatively large is the outgoing light side (the side close to the incident end face) near the light source of the light guide, it becomes increasingly smaller farther away than this. そのため導光体の裏面の波形としては、図3に示すように入射端面2aに近い側の高さhを小にしこれより離れるにつれて次第に大にすることが望ましい。 The rear surface of the waveforms Therefore lightguide, it is desirable to gradually large as to leave from this side of the height h is close to the incident end face 2a as shown in FIG. 3 the small. これによって拡散板3上での輝度を均一にすることが可能になる。 This makes it possible to uniform the luminance on the diffusing plate 3.

【0023】図4は、他の具体例であって、導光体2の裏面の波形をその波長fが入射端面2aに近い側が大であって、これより離れるにつれて小になる形状にしてその表面での明るさを均一にて輝度分布が全体として均一になるようにしたものである。 [0023] Figure 4 is a another embodiment, a large side closer to the back side of the waveform of the light guide 2 to the wavelength f is incident end face 2a, the have a shape comprising a small increasing distance from this luminance distribution the brightness of the surface at uniform is obtained as homogeneous as a whole. 尚この場合高さhはほぼ一定である。 Note in this case the height h is substantially constant.

【0024】図5は、図面左右両側に光源1を配置したもので、全体の明るさを大にしたものである。 FIG. 5 is obtained by placing the light source 1 in the drawings the left and right sides, in which the entire brightness of the large. この具体例の場合、光を両側より入射させるため左右の入射端2 In this embodiment, the incident end 2 of the left and right for incidence of light from both sides
a、2a'に近い方の波の高さhを小にし中心へ向けて次第にhが大になるようにしている。 a, gradually h towards the center and towards the wave of close to 2a 'the height h to small is set to be in the large. これによって出射面での明るさを均一にすることが可能になる。 This makes it possible to make uniform the brightness at the exit surface.

【0025】図6は、更に他の例であって、波形の形状を連続的に変化させて均一な明るさの面光源を得るようにしたものである。 [0025] FIG. 6 is a further an another example, and to obtain a surface light source of uniform brightness to the shape of the waveform is continuously changing. つまり図2におけるgの部分の傾き(図10の角θ)が順次異なるようにしたもので入射端面側が傾き角が小でこれから離れるにつれて次第に大になり入射端面と反対側の端面付近において傾き角が45 That angle of inclination in the gradual opposite end near the surface with the incident end face becomes larger as the incident end surface side inclination angle obtained by sequentially different (angle θ in FIG. 10) the slope of portion g in FIG. 2 is now separated by small There 45
°〜60°の範囲内にしてある。 ° are then in the range of to 60 °.

【0026】また、図6とは逆に、図2におけるgの部分の傾きが入射端面側が大でこれから離れるにつれて次第に小になり、入射端面と反対側の端面付近において傾き角が45°〜60°の範囲になるようにしてもよい。 Further, contrary to FIG. 6, becomes increasingly small as the inclination of the portion of g in FIG. 2 is incident end surface side coming away in large inclination angle is 45 ° in the vicinity of the end face opposite to the incident end face 60 it may be ° in the range of.

【0027】図7は、導光体2の入射端面2aと反対側の端面2d側に反射テープ等の光反射部材5を配置したものである。 FIG. 7 is obtained by disposing the light reflecting member 5 such as a reflective tape on the end face 2d side of the incident end face 2a opposite of the light guide 2. この面2dが透明な面の場合、この面より光が出てしまうためこの面側に反射テープ等の光反射部材5を配置して逆方向に戻して明るさを大にしたものがある。 If this surface 2d is transparent surface, there is obtained by the in back brightness opposite direction the light reflecting member 5 is disposed such as reflective tape on this side for thereby light is emitted from the surface to atmospheric. このように2d側に反射テープ等の光反射部材5 Light reflecting member 5 such as a reflective tape thus to 2d side
を配置し、しかも表面も裏面も平面である平板状の導光体を考えた場合、出射面側での明るさは入射端面において最も明るく次第に減少し入射端面と反対側の面2dに近づくにつれて再び増大する傾向となる。 As was arranged, moreover when the surface even backside also considered a flat light guide is planar, the brightness at the exit surface side approaches the brightest gradually reduced as the incident end surface opposite to the surface 2d at the incident end face It tends to increase again. したがって図7のように導光体2の裏面2bの波形をその高さhが入射端面2a側で最も小で次第に大にして行った後に面2 Thus surface 2 after the height h of the waveform of the back surface 2b of the light guide 2 as shown in FIG. 7 is performed gradually large in most small at the incident end face 2a side
dに近づくにつれ再び小にすることが好ましい。 It is preferred to re small as it approaches the d.

【0028】図8,図9は導光体12,12'の基本形状自体が入射端面において厚さが大で次第に薄くしたもので、これら導光体の裏面12b,12b'を前述の波形にしたものである。 FIG. 8, 9 'in which the basic shape itself of the thickness at the entrance end surface is gradually thinned in a large, rear surface 12b of the light guide, 12b' light guide 12, 12 of the aforementioned waveform one in which the.

【0029】以上述べた図3乃至図9に示す実施例は、 The embodiment shown in FIGS. 3 to 9 described above,
いずれも導光体を用いた一般の面光源装置が、導光体より出射する光の量が入射端面に近い方が大でこれより離れるにつれて小になる点を解消することを目的としてなされたものである。 Both general surface light source device using a light guide body, the amount of light emitted from the light guide is made for the purpose of eliminating the points closer to the incident end surface is smaller with increasing distance from this large it is intended. したがって波の高さh、波長fや波の形状であるgの部分の傾き角等の変化がいずれも入射端面に垂直な方向に生ずるものである。 Thus the wave height h, change in the tilt angle, etc. of the portion g in the form of wavelength f and wave in which both occur in the direction perpendicular to the incident end face. そのため導光体の裏面全体でみた場合波形によるうねりは入射端面に垂直な方向においてはすべてほぼ同一形状になっている。 Therefore waviness due if the waveform as seen in the entire back surface of the lightguide are substantially the same shape, all in the direction perpendicular to the incident end face.
そしてこのようなうねりをもつ凹凸がすべての方向つまり入射端面に平行な方向や入射端面に対し傾いた方向においては、前記の垂直な方向とは必ずしも一致するものではないがそれらがすべてにおいて曲面又は平面と曲面とによって連続的に接続させた形状であって、点状や線状となる部分が全くない。 And in such irregularities having a swell is inclined with respect to all the directions, i.e. the incident end direction and the incident end face parallel to the surface direction, it said although not necessarily coincide with the direction perpendicular or curved surface in all their a shape that is continuously connected by the plane and the curved surface, there is no portion that becomes the point-like or linear.

【0030】以上の説明は、導光体の一方の端面にのみ光源を配置したいわゆる1灯式又は2灯式のものについて述べたが、導光体の4辺の全てに光源を配置した、所謂、4灯式の面光源装置や、導光体の3辺に光源を配置した3灯式の面光源装置に適用しても勿論よい。 The above description has dealt with those of one so-called single-lamp and the light source was disposed only on the end face or two-lamp of the light guide, the light source was disposed on all four sides of the light guide, so-called four-lamp type surface light source device or, may of course be applied to a 3-lamp surface light source device and the light source was disposed on three sides of the light guide. これらの場合、光源からの光の届きにくい部分ほど、前記のh In these cases, the more difficult to reach portions of the light from the light source, said h
の値の大きな又はfの値の小さな波形とし、また粗面の粗さも、光の届きにくい部分ほど大きくすればよい。 Of a large or small wave value of f values, also the roughness of the rough surface also may be increased as the hard-to-reach portions of the light. 更に前記のgの傾きを変化させてもよい。 May be further changed the inclination of said g. また、前記のh In addition, it said of h
とfの値、粗さ、前記のgの傾きのうちから適宜にいくつかの項を選んで組み合わせて、変化させてもよい。 The value of f, the roughness, in combination choose several terms appropriately from among the inclination of said g, it may be changed.

【0031】尚凹部の内面や凸部の外面を粗面にした導光体を形成するには、次の方法を用いればよい。 It should be noted in forming the inner surface and the convex portion lightguide the outer surface was roughened in the recess may be used the following methods. つまり、先ず波形を有する金型を作りこれにサンドブラストやエッチング、又は放電加工による方法にて金型を作り、この金型を用いて射出成形等の成形手段により形成出来る。 That is, first making a mold having a waveform which the sandblasting or etching, or make a mold by the method according to the electric discharge machining can be formed by a molding means such as injection molding using this mold. この場合、放電加工の方法によれば、作業が簡単であり、所望の粗面が正確に得られる等により好ましい。 In this case, according to the method of electrical discharge machining, the work is simple, preferably by such as desired rough surface can be obtained accurately.

【0032】 [0032]

【発明の効果】本発明は、導光体の反射面をいずれの方向においても曲面又は、曲面と平面とが連続していて点又は、線状をなす部分の存在しない波形とし、更に前記反射面を粗面とし、前記波形の高さ、波長波形の傾き、 According to the present invention, a curved surface or in either direction the reflecting surface of the light guide, the point with the curved surface and the plane is not continuous or, as nonexistent waveform portion forming a linear, further the reflection the surface and rough surface, the height of the wave, the slope of wavelength waveforms,
面粗面度を適宜に変化させることで、極めて均一な輝度分布を示す面光源装置を提供することができる。 By changing appropriately the surface roughness surface of, it is possible to provide a surface light source device showing a very uniform brightness distribution.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】 本発明の面光源装置の実施例の断面図 Sectional view of an embodiment of a surface light source device of the present invention; FIG

【図2】 本発明の導光体に形成する波形の一例を示す図 It illustrates an example of FIG. 2 is a waveform to be formed on the light guide of the present invention

【図3】 本発明の実施例の導光体で波形の高さを場所により変化させた例を示す図 Illustrates an example of changing the location of the height of the waveform in the light guide embodiment of the present invention; FIG

【図4】 本発明の実施例の導光体でその長さを場所により変化させた例を示す図 Illustrates an example of changing its length by location lightguide embodiment of the present invention; FIG

【図5】 本発明で導光体の両端に夫々光源を配置した実施例を示す図 Shows an embodiment of arranging the respective light sources at both ends of the light guide in the present invention; FIG

【図6】 本発明の実施例の導光体で波の傾き角θを場所により変化させた例を示す図 6 shows an example of changing the location of the wave inclination angle θ of the light guide of the embodiment of the present invention

【図7】 本発明の実施例の導光体で入射端と反射側端面を反射面にした例を示す図 Diagram showing an example in which the reflection surface of the reflection side end surface and the incident end in the light guide of the embodiment of the present invention; FIG

【図8】 本発明の実施例の導光体で裏面を傾斜させた例を示す図 Diagram showing an example in which tilting the rear surface in the light guide of the embodiment of the present invention; FIG

【図9】 本発明の実施例の導光体で中央の厚さが小になるように裏面を傾斜させた例を示す図 Figure 9 embodiment the light guide at a center thickness of the present invention shows an example in which an inclined rear surface such that the small

【図10】 本発明の実施例の導光体に形成する波の傾きθを示した拡大図 Figure 10 is an enlarged view showing a wave of inclination θ to be formed on the light guide of the embodiment of the present invention

【図11】 従来の面光源装置の断面図 FIG. 11 is a cross-sectional view of a conventional surface light source device

【図12】 半球状凹部を形成した従来の導光体を示す図 12 is a diagram showing a conventional light guide forming a hemispherical recess

【図13】 円筒状凹部を形成した従来の導光体を示す図 13 is a diagram showing a conventional light guide formed a cylindrical recess

【図14】 図13の凹部に更に曲面を形成した従来の導光体を示す図 FIG. 14 is a diagram further illustrating a conventional light guide formed of a curved surface in the recess of Figure 13

【図15】 半球状凸部を形成した従来の導光体を示す図 15 is a diagram showing a conventional light guide forming a hemispherical protrusion

【図16】 凹部を形成し内面を粗面にした従来の導光体を示す図 [16] a recess diagram showing a conventional light guide in which the inner surface is roughened

【図17】 場所により変化する凹部を形成しその内面を粗面にした従来の導光体を示す図 [17] a recess which varies by location diagram showing a conventional light guide that the inner surface is roughened

【図18】 図17の凹部を変形した従来の導光体を示す図 FIG. 18 shows a conventional light guide obtained by modifying the recess of Figure 17

【図19】 場所により変化する凸部を形成しその表面を粗面にした従来の導光体を示す図 [Figure 19] to form a convex portion that varies by location diagram showing a conventional light guide in which the surface thereof is roughened

【符号の説明】 DESCRIPTION OF SYMBOLS

1 光源 2 導光体 2b 波形の凹凸面 3 拡散板 4 反射面 Uneven surface 3 diffusion plate 4 reflecting surface of the first light source 2 light guide 2b waveform

Claims (11)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 直線状の光源と、前記光源に入射端面を近接させ配置した導光体と、前記導光体の出射面側に配置した拡散板と、前記導光体の前記出射面側と対向する側に設けた反射面とを備えた面光源装置において、前記導光体の前記出射面側と対向する側の面を波形の多数の凹凸面としたもので、この波形の凹凸がいずれの方向においても曲面又は曲面と平面とによって連続して形成されておりこの面を粗面としたことを特徴とする面光源装置。 1. A a linear light source, a light guide arranged in proximity of the entrance end surface on the light source, a diffusion plate disposed on the exit surface side of the light guide, the exit side of the light guide and in the surface light source device provided with a reflecting surface provided on the opposite side, which was the emission surface side opposite to the side surface of the light guide and a number of irregular surfaces of the waveform irregularity of the waveform the surface light source device, characterized in that the surface is formed continuously to the rough surface by a curved surface or a curved surface and a plane in either direction.
  2. 【請求項2】 前記波形の凹凸面の波の形状が入射端面側の波の高さが小で入射端面から離れるに従って波の高さが大になることを特徴とする請求項1の面光源装置 2. A surface light source according to claim 1, the height of the wave is characterized by comprising a large as the distance from the wave shape of the uneven surface incident end surface wave height of the entrance end surface side is small in the waveform apparatus
  3. 【請求項3】 前記波形の凹凸面の波の形状が入射端面側が波長が大で入射端面から離れるに従って波長が小になることを特徴とする請求項1の面光源装置 Wherein the waveform of the uneven surface light source device of claim 1 in which the wavelength is characterized by comprising a small according to the shape of the wave moves away from the incident end face in the wavelength incident end surface side large of
  4. 【請求項4】 前記波形の凹凸面の波の形状が入射端面側の波の底と頂点との間の傾き角が入射端面から離れるに従って大又は小になり、最も離れた位置で約45°〜 4. A becomes large or small in accordance with the tilt angle between the wave bottom and apex of the wave shape of the uneven surface incident end surface side of the waveform is separated from the incident end face, approximately 45 ° at the most distant position ~
    60°になることを特徴とする請求項1の面光源装置 Characterized by comprising a 60 ° claim 1 of the surface light source device
  5. 【請求項5】 前記波形の凹凸面に形成した粗面の粗さが入射端面側が小で入射端面から離れるに従って大になるようにしたことを特徴とする請求項1の面光源装置 5. A surface light source device according to claim 1, characterized in that was set to a large roughness of the rough surface formed on the uneven surface as the incident end surface side away from the incident end face at the small of the waveform
  6. 【請求項6】前記波形の、波の高さ、波長、波の底と頂点との間の傾き、波の波の表面の粗さのうちから適宜に複数の要件を選んで変化させたことを特徴とする請求項1の面光源装置。 Of wherein said waveform, wave height, wave, the slope between the bottom and the apex of the wave, as appropriate to varying choose multiple requirements from among the roughness of the waves on the surface of the waves the surface light source device of claim 1, wherein the.
  7. 【請求項7】 直線状の光源と、前記光源に入射端面を近接させ配置した導光体と、前記導光体の前記入射端面と対向する面側に配置した光反射部材と、前記導光体の出射面側に配置した拡散板と、前記導光体の前記出射面側と対向する側に設けた反射面とを備えた面光源装置において、前記導光体の前記出射面側と対向する側の面を波形の凹凸面としたもので、この波形の凹凸がいずれの方向においても曲面又は曲面と平面とによって連続して形成されて折りおりこの面を粗面としたもので前記波形の面の波の形状が入射端面側の波の高さが小で入射端面から離れるに従って波の高さが大になり前記光反射部材に近付くにつれて再び小になるようにしたことを特徴とする面光源装置。 7. A linear light source, a light guide arranged in proximity of the entrance end surface on the light source, a light reflecting member disposed on the incident end surface opposite to the surface side of the light guide, the light guide in the surface light source device having a diffusion plate disposed on the exit surface side of the body, and said exit surface and a reflective surface provided on opposite sides of the light guide, the exit surface facing the light guide body the surface on the side in which the concave and convex surfaces of the waveform, the waveform at which irregularities of the waveform has a curved surface or a curved surface and the surface of the rough surface is folded is formed continuously by the plane in either direction wave shape of the surfaces is characterized in that the again becomes smaller as the wave height of the entrance end surface side approaches the light reflecting member wave height becomes larger as the distance from the incident end face at the small of the surface light source device.
  8. 【請求項8】 直線状の光源と、前記光源に入射端面を近接させ配置した導光体と、前記導光体の前記入射端面と対向する面側に配置した光反射部材と、前記導光体の出射面側に配置した拡散板と、前記導光体の前記出射面側と対向する側に設けた反射面とを備えた面光源装置において、前記導光体の前記出射面側と対向する側の面に光源側を波形の凹凸面としたもので、この波形の凹凸がいずれの方向においても曲面又は曲面と平面とによって連続して形成されておりこの面を粗面としたもので前記波形の面の波の形状が入射端面側の波長が大で入射端面から離れるに従って波長が小になり前記光反射部材に近付くにつれて再び大になるようにしたことを特徴とする面光源装置。 [8 claims] a linear light source, a light guide arranged in proximity of the entrance end surface on the light source, a light reflecting member disposed on the incident end surface opposite to the surface side of the light guide, the light guide in the surface light source device having a diffusion plate disposed on the exit surface side of the body, and said exit surface and a reflective surface provided on opposite sides of the light guide, the exit surface facing the light guide body a light source side surface of the side in which the concave and convex surfaces of the waveform, but irregularities in the waveform that is a curved surface or a curved surface and the surface of the rough surface are formed continuously by the plane in either direction surface light source device is characterized in that the again becomes larger as the wavelength approaches the light reflecting member becomes small according to the shape of the wave is the wavelength of the incident end surface side away from the incident end face on a large side of the wave.
  9. 【請求項9】 直線状の光源と、前記光源に入射端面を近接させ配置した導光体と、前記導光体の前記入射端面と対向する面側に配置した光反射部材と、前記導光体の出射面側に配置した拡散板と、前記導光体の前記出射面側と対向する側に設けた反射面とを備えた面光源装置において、前記導光体の前記出射面側と対向する側の面を波形の面としたもので、前記波形の凹凸面の波の形状が入射端面側の波の底と頂点との間の傾き角が入射端面から離れるに従って大又は小になることで45°〜60° [9 claim] a linear light source, a light guide arranged in proximity of the entrance end surface on the light source, a light reflecting member disposed on the incident end surface opposite to the surface side of the light guide, the light guide in the surface light source device having a diffusion plate disposed on the exit surface side of the body, and said exit surface and a reflective surface provided on opposite sides of the light guide, the exit surface facing the light guide body to those surfaces of the side and the surface of the waveform, the shape of the waves of the uneven surface of the wave is large or small in accordance with the tilt angle between the bottom and the apex of the wave of the incident end surface side away from the incident end face in 45 ° ~60 °
    に近付き45°〜60°となった後に前記反射部材に近付くに従って再び大又は小になることで45°〜60° 45 ° in the to become large or small again toward the reflecting member after reaching the 45 ° to 60 ° closer to to 60 °
    より離れていくようにしたことを特徴とする面光源装置。 Surface light source device is characterized in that as going farther.
  10. 【請求項10】 直線状の光源と、前記光源に入射端面を近接させ配置した導光体と、前記導光体の前記入射端面と対向する面側に配置した光反射部材と、前記導光体の出射面側に配置した拡散板と、前記導光体の前記出射面側と対向する側に設けた反射面とを備えた面光源装置において、前記導光体の前記出射面側と対向する側の面を波形の凹凸面としたもので、前記波形の凹凸面に毛形成した粗面の粗さが入射端面側が小で入射端面から離れるに従って大になり、前記反射部材に近付くに従って再び小になるようにしたことを特徴とする面光源装置。 10. A linear light source, a light guide arranged in proximity of the entrance end surface on the light source, a light reflecting member disposed on the incident end surface opposite to the surface side of the light guide, the light guide in the surface light source device having a diffusion plate disposed on the exit surface side of the body, and said exit surface and a reflective surface provided on opposite sides of the light guide, the exit surface facing the light guide body the surface on the side in which the concave and convex surfaces of the waveform, the roughness of the rough surface that hair formed on the uneven surface of the waveforms becomes large as the incident end face side away from the incident end face at the small, again as they approach to the reflective member surface light source device is characterized in that set to be a small.
  11. 【請求項11】 直線状の光源と、前記光源に入射端面を近接させ配置した導光体と、前記導光体の出射面側に配置した拡散板と、前記導光体の前記出射面側と対向する側に設けた反射面とを備えた面光源装置において、前記導光体の前記出射面側と対向する側の面を波形の凹凸面としたもので、前記波形の凹凸面の、波の高さ、波長、波の底と頂点との間の傾き、波の波の表面の粗さのうちから適宜に複数の要件を選んで変化させたことを特徴とする面光源装置。 11. A linear light source, a light guide arranged in proximity of the entrance end surface on the light source, a diffusion plate disposed on the exit surface side of the light guide, the exit side of the light guide and in the surface light source device provided with a reflecting surface provided on the opposite side, the face of the emission surface side opposite to a side of the light guide obtained by the irregular surface of the waveform, the irregular surface of the wave, wave height, wavelength, slope between the bottom and the apex of the wave, the surface light source device characterized by varying choose multiple requirements appropriately from among the roughness of the waves of the surface wave.
JP4296666A 1992-10-09 1992-10-09 Surface light source device Pending JPH06123885A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4296666A JPH06123885A (en) 1992-10-09 1992-10-09 Surface light source device

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP4296666A JPH06123885A (en) 1992-10-09 1992-10-09 Surface light source device
DE1992617177 DE69217177T2 (en) 1991-11-28 1992-11-27 Surface light source
DE1992617177 DE69217177D1 (en) 1991-11-28 1992-11-27 Surface light source
EP19920120336 EP0544332B1 (en) 1991-11-28 1992-11-27 Surface light source device
US07/982,942 US5584556A (en) 1991-11-28 1992-11-30 Surface light source device
US08/487,674 US5718497A (en) 1991-11-28 1995-06-07 Surface light source device

Publications (1)

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JPH06123885A true JPH06123885A (en) 1994-05-06

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6456279B1 (en) 1998-07-14 2002-09-24 Hitachi, Ltd. Liquid crystal display device with a touch panel
US6661479B2 (en) 1997-07-31 2003-12-09 Hitachi, Ltd. Liquid crystal display apparatus
JP2005258011A (en) * 2004-03-11 2005-09-22 Canon Inc Illuminator and photographing apparatus
JP2006350343A (en) * 2005-06-18 2006-12-28 Samsung Electro Mech Co Ltd Lighting device for surface display element, and surface display device provided with the same
US7489304B2 (en) 2002-08-19 2009-02-10 Fujitsu Limited Touch panel device
JPWO2007123180A1 (en) * 2006-04-19 2009-09-03 オムロン株式会社 Diffusion plate and a surface light source device
JPWO2015141367A1 (en) * 2014-03-19 2017-04-06 シャープ株式会社 Lighting device and display device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6661479B2 (en) 1997-07-31 2003-12-09 Hitachi, Ltd. Liquid crystal display apparatus
US6803977B2 (en) 1997-07-31 2004-10-12 Hitachi, Ltd. Liquid crystal display apparatus
US6958790B2 (en) 1997-07-31 2005-10-25 Hitachi, Ltd. Liquid crystal display apparatus
US6456279B1 (en) 1998-07-14 2002-09-24 Hitachi, Ltd. Liquid crystal display device with a touch panel
US7068261B2 (en) 1998-07-14 2006-06-27 Hitachi, Ltd. Liquid crystal display device with a touch panel
US7489304B2 (en) 2002-08-19 2009-02-10 Fujitsu Limited Touch panel device
JP2005258011A (en) * 2004-03-11 2005-09-22 Canon Inc Illuminator and photographing apparatus
JP2006350343A (en) * 2005-06-18 2006-12-28 Samsung Electro Mech Co Ltd Lighting device for surface display element, and surface display device provided with the same
JPWO2007123180A1 (en) * 2006-04-19 2009-09-03 オムロン株式会社 Diffusion plate and a surface light source device
JPWO2015141367A1 (en) * 2014-03-19 2017-04-06 シャープ株式会社 Lighting device and display device
US10180527B2 (en) 2014-03-19 2019-01-15 Sharp Kabushiki Kaisha Lighting device and display device

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