JP4252696B2

JP4252696B2 - Lighting device

Info

Publication number: JP4252696B2
Application number: JP29633499A
Authority: JP
Inventors: 豊脇村
Original assignee: パナソニックフォト・ライティング株式会社
Priority date: 1999-10-19
Filing date: 1999-10-19
Publication date: 2009-04-08
Anticipated expiration: 2019-10-19
Also published as: JP2001118418A

Description

【０００１】
【発明の属する技術分野】
本発明は、画像を表示するのに有用されている液晶表示装置のバックライトとして使用される照明装置に関し、特に、照明装置の構成を簡略化した照明装置に関するものである。
【０００２】
【従来の技術】
近年、液晶表示装置は、パソコン、ワープロ、ビデオカメラ等の画像表示に多用されており、その用途は多岐に及び益々拡大傾向にある。その液晶表示装置の液晶表示素子を照明するための照明装置として、例えば、図８の断面図に示されるものがあり、図において、３７は導光体、３８は導光体３７の下面に設けられ導光体下方より放出される光を導光体に再入射させる光反射部材、３９は光源である例えば直管形の冷陰極蛍光放電管、４０は導光体３７または取付枠４２に取付けられる放電管３９の光反射傘、４１は放電管の両端に取り付けられ光反射傘４０に挟みつけられることによって放電管３９を固定するためのゴムホルダー、４２は取付枠である。装置は、更に導光体３７の上面に配置され導光体の放出光を光拡散する光拡散板１２、光拡散された光を光拡散板の水平面に対して垂直方向に照射するプリズム板１３が配置されてなる。
【０００３】
以上の構成よりなる照明装置は、光源である放電管３９を点灯させることによって、導光体３７の側面より入射された光は、導光体３７の上面に導かれ、更に光拡散板１２を介して、プリズム板１３上方より図示矢印方向に放出されることになる。さて、放電管３９からの発光を効率良くプリズム板１３の上面より放出させるために、光反射傘４０及び取付枠４２の内面には、光反射効率の良い例えばアルミ蒸着を施したり、又は図９に示すように、取付枠４２の内面に例えばポリカーボネート樹脂の板材をプレス成形した光反射部材３８を貼り付けている。
【０００４】
【発明が解決しようとする課題】
上記従来の装置では、放電管の光反射傘内面及び取付枠内部には、光反射の為にアルミ蒸着を施したり、成形した光反射部材を内面に貼り付けたりしている。最近、此の種の照明装置は、使用するパソコンやワープロ等の小型化に伴って益々小型化される傾向にあり、当然光反射部材３８もそれに伴って小さなものを使用することが必要であり、そのような小さな光反射部材３８を取付枠４２や光反射傘４０に貼り付けるために、接着剤を光反射部材３８又は取付枠４２や光反射傘４０の内面に塗布して光反射部材３８を光反射傘４０や取付枠４２に貼り付けており、作業性が非常に悪い問題を有している。
【０００５】
また、光反射部材３８の貼り付けには、接着剤の他に両面テープを用いることも多々あり、光源の光反射傘４０や、図９に示すように取付枠４２の形状に合致するように成形した光反射部材３８を両面テープで貼り付ける際に、ゴミが光反射部材３８と取付枠４２又は光源の光反射傘４０の間に混入して光反射部材３８の表面が凸凹になり光反射に影響が出ることがある。さらに、アルミ等の金属蒸着には、そのための特別な設備が必要であるし、蒸着のための作業も必要になる。光反射部材の貼り付け、又は金属蒸着による光反射層の形成のいずれにしろ、工数がそれだけ要することになり、必然的にコストが高くなる等の問題点を有している。
【０００６】
したがって、本発明は、これらの問題点を改善すべくなしたものであり、構成が簡易で作業性に優れ、安価な照明装置を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明の目的を達成するために、照明装置の取付枠および光源を内挿する光源配置部は、金属板にプラスチック層を施してなる複合材を使用するものであり、この複合材を使用することによって、取付枠や光源配置部に光反射部材を貼り付けたり、取付枠や光源配置部に光反射層の金属を蒸着したりする必要がなくなり、作業性が改善されると共に、それらの作業を無くすることで安価な照明装置を提供するものである。
【０００８】
【発明の実施の形態】
本発明の請求項１に記載の発明は、導光体の上面に光拡散板とプリズム板を載置してなる照明装置の取付枠と光源配置部の材料として、金属板にプラスチック層を施してなる複合材料を用いたものであり、組立に際して取付枠や光源配置部の内面に光反射部材を貼り付けたり光反射層を施す必要がなく作業性の良い、安価な照明装置を提供できる。
【０００９】
本発明の請求項２に記載の発明は、請求項１の発明の導光体に楔形状のものを用いたもので、この形状の導光体であっても作業性の良い照明装置を提供することができる。
【００１０】
本発明の請求項３に記載の発明は、請求項１の発明の導光体に、両端部の肉厚が厚く中央部の肉厚が薄い形状のものを使用してなるもので、この形状の導光体であっても作業性の良い照明装置を提供することが出来る。
【００１１】
本発明の請求項４に記載の発明は、請求項１の発明の導光体に、均一の厚みの直方体形状のものを使用し、その少なくとも一端に光源を近接配置してなるものであり、この形状の導光体であっても作業性の良い照明装置を提供することができるものである。
【００１２】
本発明の請求項５に記載の発明は、請求項１の発明の光源が直管形の放電管であり、その両端部に取付けられるゴムホルダーを介して光源配置部に放電管を挟み付けて放電管を強固に固定するものである。
【００１３】
本発明の請求項６に記載の発明は、請求項１の発明の光源配置部の嵌合穴と嵌合する突起を導光体に設けてなるもので、導光体を強固に取付枠に取付けることが出来る。
【００１４】
本発明の請求項７に記載の発明は、請求項１にかかる発明の取付枠と光源配置部とを一体的に形成してなるもので、より組立工数を少なくすることができる。
【００１５】
本発明の請求項８に記載の発明は、導光体の上面に光拡散版を載置してなる照明装置の取付枠と光源配置部の材料として、金属板にプラスチック層を施してなる複合材料を用いてなるものであり、組立に際して取付枠や光源配置部の内面に光反射部材を貼り付けたり光反射層を施す必要がなく作業性の良い、安価な照明装置を提供できる。
【００１６】
本発明の請求項９に記載の発明は、請求項８の発明の導光体に楔形状のものを用いたもので、この形状の導光体であっても取付枠の材料に複合材を使用することによって作業性の良い照明装置を提供することが出来る。
【００１７】
本発明の請求項１０に記載の発明は、請求項８の発明の導光体として両端部の肉厚が厚く中央部の肉厚が薄い形状のものを使用してなるもので、この形状の導光体であっても取付枠の材料に複合材を使用することによって作業性の良い照明装置を提供することができる。
【００１８】
本発明の請求項１１に記載の発明は、請求項８の発明の導光体に厚みの均一な直方体形状のものを使用してなり、その少なくとも一端に光源を近接配置してなるものであり、この形状の導光体であっても取付枠の材料に複合材を使用することによって作業性の良い照明装置を提供することが出来る。
【００１９】
本発明の請求項１２に記載の発明は、請求項８の発明の光源が直管形の蛍光放電管であり、その両端部に取付けられるゴムホルダーを介して放電管を光源配置部に挟み付けることにより放電管を強固に固定することが出来る。
【００２０】
本発明の請求項１３に記載の発明は、請求項８の発明の光源配置部の嵌合穴と嵌合する突起を導光体に設けてなるもので、導光体を強固に取付枠に取付けることが出来る。
【００２１】
本発明の請求項１４に記載の発明は、請求項８にかかる発明の取付枠と光源配置部とを一体的に形成してなるもので、より組立工数を少なくすることができる。
【００２２】
【実施例】
以下、本発明を図面とともに説明する。
【００２３】
図１は、本発明の第１の実施例である照明装置の分解斜視図であり、１は照明装置の取付枠、２は取付枠に一体成形される光源配置部、３、４は、取付枠に設けられる突起、５は光源が内挿される光源内挿部、６は取付枠１及び光源内挿部５の内面に施されている光反射層、７は光源で有る例えば直管形の冷陰極蛍光放電管、８、９は、放電管７の両端部に取り付けられ放電管端部が挿入されるＲ部分の径が光源内挿部５の高さＨと同等か又は僅かに大きいものであるゴムホルダー、１０は放電管の両端の電極（図示せず）に接続されゴムホルダー８、９より引き出されたリード線、１１は例えばアクリル樹脂で成形されその側面から入射された放電管７の光を上面より光放出させる導光体、１２は導光体上面より放出された光を拡散させる光拡散板、１３は光拡散板の拡散光が矢印の方向に放出するように光放出方向を変更するプリズム板である。
【００２４】
取付枠１は、図２に示すように、アルミやステンレスの金属板１６にナイロン、オレフィン等のプラスチック樹脂層１７を接着することによって施した商品名「アルセット」で販売されているプラスチックー金属の複合材１５を例えばプレスによって図示形状に成形される。
【００２５】
組立に際しては、取付枠の材料である複合材１５をプレス等により成形して形成された図示形状の取付枠１の光源配置部２の光源内挿部５にゴムホルダー８及び９を取り付けた冷陰極蛍光放電管７を保持し、次いで、取付枠１の１４の部分に導光体１１を載置し、更に導光体１１の上面に光拡散板１２及びプリズム板１３を順次に載置し、最後に突起３及び４を取付枠１の内方に折り曲げて導光体１１、光拡散板１２及びプリズム板１３が取付枠１より外れないように取杖枠１に固定して、図３に示すように完成される。図４は図３のＡ−Ａ線の縦断面図を示す。なお、図において、１８は、導光体１１の下面に設けられ導光体の側面より入射した光を導光体に均一に導光するための複数個の溝又は突起である。
【００２６】
図５は、本発明の照明装置の第２の実施例であり、要部のみを斜視図で示したものである。当実施例は、照明装置の中でも比較的容積の大きい導光板１１をより安定させて取付枠１に取付る為の手段を示し、光源配置部２に嵌合穴１９を設け、それに嵌合する突起２０を導光体１１に設けたものであり、突起２０が、嵌合穴１９に嵌合することによってより強く取付枠１に保持されるものである。
【００２７】
図６は、本発明の第３の実施例を示す断面図であり、図において、２１は、前実施例と同様の複合材１５を成形してなる照明装置の取付枠、２２、２３は取付枠と一体的に成形される光源配置部、２４は、図１の楔形状の導光体を厚みの薄い端面部で２個貼り合せたような図示形状の導光体、２５、２６は例えば冷陰極蛍光放電管である光源、２７、２８は、図１で説明したように冷陰極蛍光放電管の両端に取付けられ放電管２５、２６を光源配置部２２、２３に挟みつけて保持するためのゴムホルダーである。当実施例の照明装置は、導光体２４の両端面に放電管２５、２６を配置することによって、導光体から放出される発光輝度を大きくするのに適したものである。
【００２８】
図７は本発明の第４の実施例であり、厚みが均一な直方体形状の導光体の両端に光源を配したものである。図において、２９は前実施例同様の複合材１５を使用し成形してなる取付枠、３０、３１は光源の配置部、３２は厚みが均一な直方体形状の導光体、３３、３４は光源である冷陰極蛍光放電管、３５、３６は冷陰極蛍光放電管３３、３４の端部に取付けられ放電管を前述したように光源配置部に保持するゴムホルダーである。この直方体形状の導光体の場合には、導構体両端に光源を配置しなくても、一端だけに近接配置しても良い。
【００２９】
【発明の効果】
以上述べたように、本発明の照明装置は、従来装置において必要とされていた取付枠や反射傘である光源配置部の内面に光反射部材を貼り付けたり、金属蒸着層による光反射層を施す必要がないので極めて作業性に富み、コストを廉価にすることが出来る。また、光反射部材を貼り付ける作業の際に、ゴミが混入することもなく、光反射部材を貼り付ける際の作業によって光反射面の表面を傷つける危険性も全くない。
【００３０】
本発明の実施例では、光拡散板の上面にプリズム板を載置した照明装置を示したが、最近では導光体の構成によってはプリズム板を不要にした照明装置も提案実施されており、当然此の種の照明装置にも本発明の基本ともいえる複合材を使用した取付枠を適用することは勿論可能である。又、光源として、冷陰極蛍光放電管を用いたが、これも他の熱陰極蛍光放電管を使用しても良いことは勿論である。更に、光反射傘である光源配置部を取付枠に一体形成したが、光源配置部を取付枠と別に形成し、光源配置部を取付枠または導光体に取付けても良い。
【図面の簡単な説明】
【図１】本発明の第１の実施例である照明装置の分解斜視図
【図２】図１の実施例における取付枠の材料の断面図
【図３】図１の分解斜視図の組立完成図
【図４】図３の組立完成図のＡ−Ａ線の縦断面図
【図５】本発明の第２の実施例である照明装置の要部を部分的に示した斜視図
【図６】本発明の第３の実施例である照明装置の断面図
【図７】本発明の第４の実施例である照明装置の断面図
【図８】照明装置の従来例である断面図
【図９】図８の従来例にかかる取付枠と光反射部材を示す斜視図
【符号の説明】
１取付枠
２光源配置部
３、４突起
５光源内挿部
６光反射層
７冷陰極蛍光放電管
８、９ゴムホルダー
１１導光体
１２光拡散板
１３プリズム板
１５複合材
１９嵌合穴
２０突起
２１取付枠
２２、２３光源配置部
２４導光体
２５、２６冷陰極蛍光放電管
２７、２８ゴムホルダー
２９取付枠
３０、３１光源配置部
３２導光体
３３、３４冷陰極蛍光放電管
３５、３６ゴムホルダ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illuminating device used as a backlight of a liquid crystal display device that is useful for displaying an image, and more particularly to an illuminating device with a simplified configuration of the illuminating device.
[0002]
[Prior art]
In recent years, liquid crystal display devices are widely used for image display of personal computers, word processors, video cameras, and the like, and their uses are diversified and are increasingly expanding. As an illuminating device for illuminating the liquid crystal display element of the liquid crystal display device, for example, one shown in the cross-sectional view of FIG. 8 is provided, in which 37 is provided on the lower surface of the light guide 37. A light reflecting member that re-enters the light guide from below the light guide, 39 is a light source such as a straight-tube cold cathode fluorescent discharge tube, and 40 is attached to the light guide 37 or the mounting frame 42 The light reflecting umbrella 41 of the discharge tube 39 is attached to both ends of the discharge tube and is sandwiched between the light reflecting umbrellas 40 to fix the discharge tube 39, and 42 is an attachment frame. The apparatus further includes a light diffusing plate 12 disposed on the upper surface of the light guide 37 for diffusing light emitted from the light guide, and a prism plate 13 for irradiating the light diffused light in a direction perpendicular to the horizontal plane of the light diffusing plate. Is arranged.
[0003]
In the illumination device having the above configuration, the discharge tube 39 as the light source is turned on, so that the light incident from the side surface of the light guide 37 is guided to the upper surface of the light guide 37 and further the light diffusion plate 12 is moved. Thus, the light is emitted from above the prism plate 13 in the direction indicated by the arrow. Now, in order to efficiently emit light from the discharge tube 39 from the upper surface of the prism plate 13, the inner surfaces of the light reflector 40 and the mounting frame 42 are subjected to, for example, aluminum vapor deposition with good light reflection efficiency, or FIG. As shown in FIG. 2, a light reflecting member 38 obtained by press-molding a plate material made of polycarbonate resin, for example, is attached to the inner surface of the mounting frame 42.
[0004]
[Problems to be solved by the invention]
In the above-described conventional apparatus, aluminum is deposited on the inner surface of the light reflecting umbrella and the mounting frame of the discharge tube for light reflection, or a molded light reflecting member is attached to the inner surface. Recently, this type of lighting device has been increasingly reduced in size with the downsizing of personal computers and word processors to be used, and naturally the light reflecting member 38 needs to be used with a smaller one. In order to attach such a small light reflecting member 38 to the mounting frame 42 or the light reflecting umbrella 40, an adhesive is applied to the inner surface of the light reflecting member 38 or the mounting frame 42 or the light reflecting umbrella 40. Is affixed to the light reflecting umbrella 40 and the mounting frame 42, and has a problem that workability is very bad.
[0005]
In addition, the light reflecting member 38 is often affixed with a double-sided tape in addition to the adhesive, so that it matches the shape of the light reflecting umbrella 40 of the light source or the mounting frame 42 as shown in FIG. When the molded light reflecting member 38 is affixed with the double-sided tape, dust is mixed between the light reflecting member 38 and the mounting frame 42 or the light reflecting umbrella 40 of the light source, and the surface of the light reflecting member 38 becomes uneven and reflects light. May be affected. Further, special equipment for the vapor deposition of metal such as aluminum is necessary, and an operation for vapor deposition is also required. Regardless of whether the light reflecting member is attached or the light reflecting layer is formed by metal vapor deposition, the man-hour is required and the cost is inevitably increased.
[0006]
Therefore, the present invention has been made to improve these problems, and an object of the present invention is to provide an inexpensive lighting device that is simple in configuration, excellent in workability, and inexpensive.
[0007]
[Means for Solving the Problems]
In order to achieve the object of the present invention, the mounting frame of the lighting device and the light source arrangement part for interpolating the light source use a composite material in which a plastic layer is applied to a metal plate, and this composite material is used. This eliminates the need to attach a light reflecting member to the mounting frame or the light source arrangement part, or to deposit a metal of the light reflecting layer on the mounting frame or the light source arrangement part. Therefore, an inexpensive lighting device is provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a plastic layer is applied to a metal plate as a material for a mounting frame and a light source arrangement portion of a lighting device in which a light diffusion plate and a prism plate are placed on the upper surface of a light guide. Therefore, there is no need to attach a light reflecting member or a light reflecting layer to the inner surface of the mounting frame or the light source arrangement portion when assembling, and it is possible to provide an inexpensive lighting device with good workability.
[0009]
The invention according to claim 2 of the present invention uses a wedge-shaped light guide body according to the invention of claim 1, and provides an illuminating device having good workability even with the light guide body of this shape. can do.
[0010]
The invention according to claim 3 of the present invention uses the light guide of the invention of claim 1 having a shape with a thick wall at both ends and a thin wall at the center. Even if it is a light guide, it is possible to provide a lighting device with good workability.
[0011]
Invention of Claim 4 of this invention uses the thing of the rectangular parallelepiped shape of uniform thickness for the light guide of invention of Claim 1, and arranges a light source close to at least one end, Even with this shape of the light guide, it is possible to provide a lighting device with good workability.
[0012]
In the invention according to claim 5 of the present invention, the light source of the invention of claim 1 is a straight tube type discharge tube, and the discharge tube is sandwiched between light source arrangement portions via rubber holders attached to both ends thereof. The discharge tube is firmly fixed.
[0013]
According to a sixth aspect of the present invention, the light guide is provided with a projection that fits into the fitting hole of the light source arrangement portion of the first aspect of the invention, and the light guide is firmly attached to the mounting frame. Can be attached.
[0014]
According to the seventh aspect of the present invention, the mounting frame and the light source arrangement portion according to the first aspect of the present invention are integrally formed, and the number of assembling steps can be further reduced.
[0015]
The invention according to claim 8 of the present invention is a composite in which a plastic layer is applied to a metal plate as a material for a mounting frame and a light source arrangement portion of a lighting device in which a light diffusion plate is placed on the upper surface of a light guide. Since it is made of a material, there is no need to attach a light reflecting member or a light reflecting layer to the inner surface of the mounting frame or the light source arrangement portion during assembly, and an inexpensive lighting device with good workability can be provided.
[0016]
The invention according to claim 9 of the present invention uses a wedge-shaped light guide body according to the invention of claim 8, and even if the light guide body has this shape, a composite material is used as the material of the mounting frame. By using it, it is possible to provide a lighting device with good workability.
[0017]
The invention according to claim 10 of the present invention uses a light guide of the invention of claim 8 having a shape with a thick wall at both ends and a thin wall at the center. Even if it is a light guide, an illuminating device with good workability can be provided by using a composite material for the material of the mounting frame.
[0018]
According to an eleventh aspect of the present invention, the light guide body according to the eighth aspect of the present invention uses a rectangular parallelepiped shape having a uniform thickness, and a light source is disposed close to at least one end thereof. Even if it is a light guide of this shape, it is possible to provide a lighting device with good workability by using a composite material for the material of the mounting frame.
[0019]
According to a twelfth aspect of the present invention, the light source according to the eighth aspect of the present invention is a straight tube type fluorescent discharge tube, and the discharge tube is sandwiched between the light source arrangement portions via rubber holders attached to both ends thereof. As a result, the discharge tube can be firmly fixed.
[0020]
The invention according to claim 13 of the present invention is such that a projection that fits into the fitting hole of the light source arrangement portion of the invention of claim 8 is provided on the light guide, and the light guide is firmly attached to the mounting frame. Can be attached.
[0021]
According to the fourteenth aspect of the present invention, the mounting frame and the light source arrangement portion according to the eighth aspect of the present invention are integrally formed, and the number of assembling steps can be further reduced.
[0022]
【Example】
The present invention will be described below with reference to the drawings.
[0023]
FIG. 1 is an exploded perspective view of a lighting device according to a first embodiment of the present invention. Reference numeral 1 denotes a mounting frame of the lighting device, 2 denotes a light source arrangement part integrally formed on the mounting frame, and 3 and 4 denote mountings. Protrusions provided on the frame, 5 is a light source insertion part in which a light source is inserted, 6 is a light reflecting layer applied to the inner surface of the mounting frame 1 and the light source insertion part 5, and 7 is a light source, for example, a straight tube shape Cold-cathode fluorescent discharge tubes 8 and 9 are attached to both ends of the discharge tube 7 and the diameter of the R portion into which the discharge tube end portion is inserted is equal to or slightly larger than the height H of the light source insertion portion 5 The rubber holder 10 is connected to electrodes (not shown) at both ends of the discharge tube, lead wires drawn out from the rubber holders 8 and 9, and 11 is a discharge tube 7 formed of, for example, acrylic resin and incident from the side surface thereof. A light guide that emits light from the top surface, and 12 diffuses the light emitted from the top surface of the light guide Diffuser 13 is a prism plate for changing the optical emission direction as the diffused light of the light diffusion plate emits in the direction of the arrow.
[0024]
As shown in FIG. 2, the mounting frame 1 is a plastic metal sold under the trade name “Alset” made by bonding a plastic resin layer 17 such as nylon or olefin to an aluminum or stainless steel metal plate 16. The composite material 15 is formed into the illustrated shape by, for example, a press.
[0025]
When assembling, a cooling material in which rubber holders 8 and 9 are attached to the light source insertion portion 5 of the light source arrangement portion 2 of the mounting frame 1 of the illustrated shape formed by molding the composite material 15 which is a material of the mounting frame by pressing or the like. The cathode fluorescent discharge tube 7 is held, and then the light guide 11 is placed on the portion 14 of the mounting frame 1, and the light diffusion plate 12 and the prism plate 13 are sequentially placed on the upper surface of the light guide 11. Finally, the protrusions 3 and 4 are bent inward of the mounting frame 1 and fixed to the cane frame 1 so that the light guide 11, the light diffusing plate 12 and the prism plate 13 are not detached from the mounting frame 1. Completed as shown in FIG. 4 is a longitudinal sectional view taken along line AA of FIG. In the figure, reference numeral 18 denotes a plurality of grooves or protrusions provided on the lower surface of the light guide 11 for uniformly guiding light incident from the side surface of the light guide to the light guide.
[0026]
FIG. 5 shows a second embodiment of the lighting device according to the present invention, in which only the main part is shown in a perspective view. This embodiment shows a means for more stably mounting the light guide plate 11 having a relatively large volume in the lighting device to the mounting frame 1, and a fitting hole 19 is provided in the light source arrangement portion 2 to be fitted thereto. The protrusions 20 are provided on the light guide 11, and the protrusions 20 are held in the mounting frame 1 more strongly by being fitted into the fitting holes 19.
[0027]
FIG. 6 is a cross-sectional view showing a third embodiment of the present invention. In FIG. 6, reference numeral 21 denotes a mounting frame of a lighting device formed by molding the same composite material 15 as in the previous embodiment, and reference numerals 22 and 23 denote mounting frames. The light source arrangement part 24 formed integrally with the frame 24 is a light guide body of the illustrated shape in which two wedge-shaped light guide bodies of FIG. The light sources 27 and 28, which are cold cathode fluorescent discharge tubes, are attached to both ends of the cold cathode fluorescent discharge tube as described with reference to FIG. 1 in order to sandwich and hold the discharge tubes 25 and 26 between the light source arrangement portions 22 and 23. This is a rubber holder. The illumination device of this embodiment is suitable for increasing the emission luminance emitted from the light guide by disposing the discharge tubes 25 and 26 on both end faces of the light guide 24.
[0028]
FIG. 7 shows a fourth embodiment of the present invention, in which light sources are arranged at both ends of a rectangular parallelepiped light guide having a uniform thickness. In the figure, 29 is a mounting frame formed by using the same composite material 15 as in the previous embodiment, 30 and 31 are light source arrangement parts, 32 is a rectangular parallelepiped light guide, and 33 and 34 are light sources. The cold cathode fluorescent discharge tubes 35 and 36 are rubber holders which are attached to the ends of the cold cathode fluorescent discharge tubes 33 and 34 and hold the discharge tube in the light source arrangement portion as described above. In the case of this rectangular parallelepiped light guide, the light source may not be disposed at both ends of the conductive structure, but may be disposed close to only one end.
[0029]
【The invention's effect】
As described above, the illumination device according to the present invention has a light reflection member attached to the inner surface of the light source arrangement portion which is a mounting frame or a reflector that has been required in the conventional device, or a light reflection layer formed of a metal vapor deposition layer. Since there is no need to apply it, the workability is extremely high and the cost can be reduced. Further, dust is not mixed in the operation of attaching the light reflecting member, and there is no risk of damaging the surface of the light reflecting surface by the operation of attaching the light reflecting member.
[0030]
In the embodiment of the present invention, an illuminating device in which a prism plate is mounted on the upper surface of the light diffusing plate is shown, but recently, an illuminating device that does not require the prism plate depending on the configuration of the light guide has been proposed and implemented. Of course, it is of course possible to apply a mounting frame using a composite material which can be said to be the basis of the present invention to this kind of lighting device. Further, although the cold cathode fluorescent discharge tube is used as the light source, it is needless to say that another hot cathode fluorescent discharge tube may be used. Furthermore, although the light source arrangement part which is a light reflector is integrally formed on the attachment frame, the light source arrangement part may be formed separately from the attachment frame, and the light source arrangement part may be attached to the attachment frame or the light guide.
[Brief description of the drawings]
1 is an exploded perspective view of a lighting device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a material of a mounting frame in the embodiment of FIG. 1. FIG. 3 is an assembled assembly of the exploded perspective view of FIG. FIG. 4 is a longitudinal sectional view taken along line AA of the completed assembly of FIG. 3. FIG. 5 is a perspective view partially showing a main part of a lighting device according to a second embodiment of the present invention. FIG. 7 is a sectional view of a lighting device according to a fourth embodiment of the present invention. FIG. 8 is a sectional view of a lighting device according to a fourth embodiment of the present invention. 9 is a perspective view showing a mounting frame and a light reflecting member according to the conventional example of FIG.
DESCRIPTION OF SYMBOLS 1 Mounting frame 2 Light source arrangement | positioning part 3, 4 Protrusion 5 Light source insertion part 6 Light reflection layer 7 Cold cathode fluorescent discharge tube 8, 9 Rubber holder 11 Light guide 12 Light diffusion plate 13 Prism plate 15 Composite material 19 Fitting hole 20 Projection 21 Mounting frame 22, 23 Light source arrangement portion 24 Light guide body 25, 26 Cold cathode fluorescent discharge tube 27, 28 Rubber holder 29 Mounting frame 30, 31 Light source arrangement portion 32 Light guide body 33, 34 Cold cathode fluorescent discharge tube 35, 36 Rubber holder

Claims

光源と、取付枠と、前記光源が近接して配置され前記光源からの発光が側面から光入射され上面から光放出させる導光体と、前記光源を内挿して配置する光源配置部と、この導光体の上面に配置され前記導光体の上面からの放出光を光拡散させる光拡散板と、この光拡散板の上面に配置され前記光拡散板によって拡散された光を変更するプリズム板とを備えてなる照明装置において、前記取付枠と前光源配置部は、金属板にプラスチック層を施してなる複合材料で形成されてなる照明装置。A light source, a mounting frame, a light guide that is disposed in the vicinity of the light source, light emitted from the light source is incident on the side surface and is emitted from the upper surface, a light source arrangement unit that interposes and arranges the light source, and A light diffusing plate disposed on the upper surface of the light guide to diffuse light emitted from the upper surface of the light guide, and a prism plate disposed on the upper surface of the light diffusing plate to change the light diffused by the light diffusing plate The mounting frame and the front light source arrangement part are formed of a composite material obtained by applying a plastic layer to a metal plate.

導光体は一端の厚みが厚く他端の厚みが薄い楔形状のものであり、光源が前記導光体の一端に近接して配置されてなる請求項１記載の照明装置。The lighting device according to claim 1, wherein the light guide has a wedge shape in which one end has a large thickness and the other end has a small thickness, and a light source is disposed adjacent to one end of the light guide.

導光体は両端部の厚みが厚く中央部の厚みが薄い形状のものであり、前記両端部に近接して光源が配置されてなる請求項１記載の照明装置。The lighting device according to claim 1, wherein the light guide has a shape in which both end portions are thick and a central portion is thin, and a light source is disposed adjacent to the both end portions.

導光体は均一の直方体形状のものであり、前記導光体の少なくとも一端に光源が近接配置されてなる請求項１記載の照明装置。The lighting device according to claim 1, wherein the light guide has a uniform rectangular parallelepiped shape, and a light source is disposed close to at least one end of the light guide.

光源は直管形の蛍光放電管であり、その両端部に取付けられるゴムホルダーを介して光源配置部に挟み付けられて前記光源配置部に保持されてなる請求項１記載の照明装置。2. The illumination device according to claim 1, wherein the light source is a straight tube type fluorescent discharge tube, and is sandwiched between and held by the light source arrangement part via rubber holders attached to both ends thereof.

光源配置部に嵌合穴を設け、前記嵌合穴に嵌合する突起を導光体に設けてなる請求項１に記載の照明装置。The lighting device according to claim 1, wherein a fitting hole is provided in the light source arrangement portion, and a protrusion that fits into the fitting hole is provided in the light guide.

光源配置部と取付枠は、一体に形成されてなる請求項１に記載の照明装置。The lighting device according to claim 1, wherein the light source arrangement portion and the attachment frame are integrally formed.

光源と、取付枠と、前記光源が近接して配置され前記光源からの発光が側面から光入射され上面から光放出させる導光体と、前記光源を内挿して配置する光源配置部と、この導光体の上面に配置され前記導光体の上面からの放出光を光拡散させる光拡散板とを備えてなる照明装置において、前記取付枠と前光源配置部は、金属板にプラスチック層を施してなる複合材料で形成されてなる照明装置。A light source, a mounting frame, a light guide that is disposed in the vicinity of the light source, light emitted from the light source is incident on the side surface and is emitted from the upper surface, a light source arrangement unit that interposes and arranges the light source, and In the illumination device comprising a light diffusing plate that is disposed on the upper surface of the light guide and diffuses light emitted from the upper surface of the light guide, the mounting frame and the front light source arrangement portion include a plastic layer on the metal plate. An illumination device formed of a composite material.

導光体は一端の厚みが厚く他端の厚みが薄い楔形状のものであり、光源が前記導光体の一端に近接して配置されてなる請求項８記載の照明装置。The lighting device according to claim 8, wherein the light guide has a wedge shape with a thick end at one end and a thin thickness at the other end, and a light source is disposed adjacent to the one end of the light guide.

導光体は両端部の厚みが厚く中央部の厚みが薄い形状のものであり、前記両端部に近接して光源が配置されてなる請求項８記載の照明装置。The lighting device according to claim 8, wherein the light guide has a shape in which both end portions are thick and a central portion is thin, and a light source is disposed adjacent to the both end portions.

導光体は均一の直方体形状のものであり、前記導光体の少なくとも一端に光源が近接配置されてなる請求項８記載の照明装置。The lighting device according to claim 8, wherein the light guide has a uniform rectangular parallelepiped shape, and a light source is disposed close to at least one end of the light guide.

光源は直管形の蛍光放電管であり、その両端部に取付けられるゴムホルダーを介して光源配置部に挟み付けられて前記光源配置部に保持されてなる請求項８記載の照明装置。The illuminating device according to claim 8, wherein the light source is a straight tube type fluorescent discharge tube, and is sandwiched between the light source arrangement portions via rubber holders attached to both ends thereof and held by the light source arrangement portions.

光源配置部に嵌合穴を設け、前記嵌合穴に嵌合する突起を導光体に設けてなる請求項８に記載の照明装置。The lighting device according to claim 8, wherein a fitting hole is provided in the light source arrangement portion, and a projection that fits into the fitting hole is provided in the light guide.

光源配置部と取付枠は、一体に形成されてなる請求項８に記載の照明装置。The lighting device according to claim 8, wherein the light source arrangement portion and the attachment frame are integrally formed.