JP2014089864A - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
JP2014089864A
JP2014089864A JP2012238694A JP2012238694A JP2014089864A JP 2014089864 A JP2014089864 A JP 2014089864A JP 2012238694 A JP2012238694 A JP 2012238694A JP 2012238694 A JP2012238694 A JP 2012238694A JP 2014089864 A JP2014089864 A JP 2014089864A
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Prior art keywords
guide plate
light guide
light source
led light
led
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Inventor
Shigeru Takimoto
滋 瀧本
Mee Suk Rho
ミシュク ノ
Seung Kwan Choo
スンカン ツウ
Taek Kyu Kim
タックギュ キム
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TECHSIGN LIGHT PANEL
Kowa Co Ltd
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TECHSIGN LIGHT PANEL
Kowa Co Ltd
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Priority to JP2012238694A priority Critical patent/JP2014089864A/en
Priority to KR1020130113739A priority patent/KR20140057148A/en
Priority to PCT/KR2013/008684 priority patent/WO2014069791A1/en
Publication of JP2014089864A publication Critical patent/JP2014089864A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/02—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages with provision for adjustment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Planar Illumination Modules (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent thermal expansion of a light guide plate from being blocked and to maintain luminous efficiency high in an edge light type lighting device using an LED light source.SOLUTION: An LED light source 3 is disposed so as to face a side face of a light guide plate 2, and a substrate holding member 6 having an almost U-shaped cross section is disposed so as to encircle an edge of the light guide plate 2 and the LED light source 3. An energization part 5a which is abutted to a back surface 2b of the light guide plate 2 and gives an energizing force is disposed in the state in which it is supported by the substrate holding member 6, a part (hereinafter, referred to as "a stopper part") 6b of the substrate holding member 6 is disposed on a front surface 2a side of the light guide plate 2 and is abutted to a diffusion plate 8. Positioning in a plate thickness direction ±m of the light guide plate 2 is performed by the stopper part 6b supported by the LED light source 3, so that a relative positional relationship between the light guide plate 2 and the LED light source 3 is always maintained almost constant, and luminous efficiency is maintained almost constant as well.

Description

本発明は、照明装置の構造に関する。   The present invention relates to a structure of a lighting device.

近年、白熱灯や蛍光灯に代わり、省エネ特性に優れたＬＥＤ光源が注目されており、該ＬＥＤ光源を用いた照明装置の構造についても種々の提案がなされている（例えば、特許文献１参照）。   In recent years, LED light sources excellent in energy saving characteristics have attracted attention in place of incandescent lamps and fluorescent lamps, and various proposals have been made for the structure of an illumination device using the LED light sources (see, for example, Patent Document 1). .

図４は、エッジライト型の照明装置の従来構成の一例を示す断面図であり、符号１０２は、透光性材料で構成された導光板を示し、符号１０３は、該導光板１０２の側面に対向するように配置されて該導光板内に照明光Ｌ１を出射するＬＥＤ光源を示し、該ＬＥＤ光源１０３から前記導光板１０２内に出射された光Ｌ１は該導光板１０２の正面から出射されるように構成されている（符号Ｌ２参照）。このようなエッジライト型の照明装置は、ＬＥＤ光源１０３を導光板１０２の背面側にではなく側面側に配置しているので、薄型にできるという特徴を有している。   FIG. 4 is a cross-sectional view showing an example of a conventional configuration of an edge light type illumination device. Reference numeral 102 denotes a light guide plate made of a translucent material, and reference numeral 103 denotes a side surface of the light guide plate 102. An LED light source that is disposed so as to be opposed and emits illumination light L1 into the light guide plate is shown. Light L1 emitted from the LED light source 103 into the light guide plate 102 is emitted from the front of the light guide plate 102. (Refer code | symbol L2). Such an edge light type illuminating device is characterized in that the LED light source 103 is disposed not on the back side of the light guide plate 102 but on the side surface side, and thus can be made thin.

特開２０１０−１７７０７７号公報JP 2010-177077 A

このような構成の照明装置は、液晶テレビや液晶モニターのバックライトとしても使用されているが、バックライトではなく天井等に設置して照明装置として使用する場合にはＬＥＤ光源１０３の光量が多くなって発熱量も多くなるので、前記導光板１０２の膨張には特に注意する必要があった。   The illuminating device having such a configuration is also used as a backlight of a liquid crystal television or a liquid crystal monitor. However, when the illuminating device is installed not on the backlight but on the ceiling or the like and used as an illuminating device, the light amount of the LED light source 103 is large. Since the amount of generated heat increases, it is necessary to pay particular attention to the expansion of the light guide plate 102.

本発明は、上述の問題を解消することのできる照明装置を提供することを目的とするものである。   An object of the present invention is to provide an illumination device that can solve the above-described problems.

請求項１に係る発明は、透光性材料で構成された導光板と、該導光板の側面のうちの少なくとも一部の側面（以下、「光源対向側面」とする）に対向するように配置されて該導光板内に照明光を出射するＬＥＤ光源と、該導光板の少なくとも一部及び該ＬＥＤ光源の少なくとも一部を囲繞するように配置されてそれらを収納するフレーム部材と、を備えた照明装置において、
前記導光板の面のうち前記ＬＥＤ光源からの光が出射される側の面を「導光板正面」とし、前記導光板の面のうち前記導光板正面と反対側の面を「導光板背面」とし、該導光板正面及び該導光板背面のうちの任意の一方を「導光板第１面」とし他方を「導光板第２面」とした場合に、
前記ＬＥＤ光源に支持されると共に前記導光板第１面に直接的に又は他の部材を介して間接的に当接されることに基づき該第１面に付勢力を与える付勢部と、
前記ＬＥＤ光源に支持されると共に前記導光板第２面に直接的に又は他の部材を介して間接的に当接されることに基づき前記付勢部に付勢されてなる前記導光板の板厚方向の位置を規定するストッパ部と、
前記ＬＥＤ光源、前記付勢部、及び前記ストッパ部を前記光源対向側面の法線方向に移動可能な状態で収納するように前記フレーム部材内に形成された収納空間部と、
前記ＬＥＤ光源と前記フレーム部材との間に配置されることにより、該ＬＥＤ光源を前記導光板の光源対向側面の側に付勢するバネ部材と、を備えたことを特徴とする。 The invention according to claim 1 is disposed so as to oppose a light guide plate made of a light-transmitting material and at least a part of side surfaces of the light guide plate (hereinafter referred to as “light source facing side surface”). An LED light source that emits illumination light into the light guide plate, and a frame member that is disposed so as to surround at least a part of the light guide plate and at least a part of the LED light source, and stores them. In the lighting device,
Of the surfaces of the light guide plate, the surface on the side from which light from the LED light source is emitted is referred to as “front surface of the light guide plate”, and among the surfaces of the light guide plate, the surface opposite to the front surface of the light guide plate is referred to as “back surface of the light guide plate”. When any one of the front surface of the light guide plate and the back surface of the light guide plate is a “light guide plate first surface” and the other is a “light guide plate second surface”,
An urging portion that is supported by the LED light source and applies an urging force to the first surface based on being brought into direct contact with the first surface of the light guide plate directly or indirectly through another member;
The plate of the light guide plate supported by the LED light source and urged by the urging portion based on being in direct contact with the second surface of the light guide plate directly or indirectly through another member A stopper that defines the position in the thickness direction;
A storage space portion formed in the frame member so as to store the LED light source, the biasing portion, and the stopper portion in a state in which the LED light source, the biasing portion, and the stopper portion are movable in a normal direction of the light source facing side surface;
And a spring member that is disposed between the LED light source and the frame member and biases the LED light source toward the light source facing side of the light guide plate.

請求項２に係る発明は、請求項１に係る発明において、前記ＬＥＤ光源に近接する位置から前記導光板第１面に沿う方向に延設されて前記付勢部を支持する支持部と、前記ＬＥＤ光源に近接する位置から前記導光板第２面に沿う方向に延設された前記ストッパ部と、前記支持部における前記ＬＥＤ光源に近接する部分及び前記ストッパ部における前記ＬＥＤ光源に近接する部分を連結するように配置されると共に該ＬＥＤ光源に固定されてなる基部と、により断面が略コ字状に形成された基板保持部材、を備えたことを特徴とする。   The invention according to claim 2 is the invention according to claim 1, wherein the support portion that extends in a direction along the first surface of the light guide plate from a position close to the LED light source and supports the biasing portion; The stopper portion extending in a direction along the second surface of the light guide plate from a position close to the LED light source, a portion close to the LED light source in the support portion, and a portion close to the LED light source in the stopper portion And a substrate holding member having a substantially U-shaped cross section by a base portion that is arranged to be connected and fixed to the LED light source.

請求項３に係る発明は、請求項１又は２に係る発明において、光を拡散させるための拡散板が前記導光板正面に沿うように配置され、
光を反射するための反射シートが前記導光板背面に沿うように配置され、
前記ストッパ部及び前記付勢部のうちの一方は、前記拡散板を介して前記導光板に間接的に当接されるように配置され、
前記ストッパ部及び前記付勢部のうちの他方は、前記反射シートが配置されていない部分で前記導光板に直接的に当接されるように構成されたことを特徴とする。 The invention according to claim 3 is the invention according to claim 1 or 2, wherein a diffusion plate for diffusing light is arranged along the front surface of the light guide plate,
A reflective sheet for reflecting light is arranged along the back of the light guide plate,
One of the stopper part and the urging part is disposed so as to be indirectly in contact with the light guide plate via the diffusion plate,
The other of the stopper part and the urging part is configured to be in direct contact with the light guide plate at a portion where the reflection sheet is not disposed.

請求項４に係る発明は、請求項１乃至３のいずれか１項に記載の発明において、前記フレーム部材と前記バネ部材とが熱伝導に優れた材料にて構成され、
前記ＬＥＤ光源の熱が前記バネ部材及び前記フレーム部材を介して放散されるように構成されたことを特徴とする。 The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the frame member and the spring member are made of a material excellent in heat conduction,
The LED light source is configured to dissipate heat through the spring member and the frame member.

請求項１及び２に係る発明によれば、前記導光板は前記付勢部により前記ストッパ部に押し付けられるので、該導光板と該ストッパ部との相対的な位置関係（板厚方向に関する位置関係）は一定である。また、該ストッパ部は前記ＬＥＤ光源に支持されているので、該ストッパ部と該ＬＥＤ光源との相対的な位置関係（前記板厚方向に関する位置関係）も一定である。これにより、前記ＬＥＤ光源と前記導光板との相対的な位置関係（前記板厚方向に関する位置関係）も一定となる。したがって、前記ＬＥＤ光源から前記光源対向側面を通って前記導光板内に出射される光の量はほぼ一定となり、前記導光板の熱膨張にかかわらず発光効率をほぼ一定に維持することができる。   According to the first and second aspects of the invention, since the light guide plate is pressed against the stopper portion by the biasing portion, a relative positional relationship between the light guide plate and the stopper portion (a positional relationship in the thickness direction). ) Is constant. Moreover, since this stopper part is supported by the said LED light source, the relative positional relationship (positional relationship regarding the said plate | board thickness direction) of this stopper part and this LED light source is also constant. Thereby, the relative positional relationship between the LED light source and the light guide plate (the positional relationship in the thickness direction) is also constant. Therefore, the amount of light emitted from the LED light source through the light source-facing side surface into the light guide plate is substantially constant, and the light emission efficiency can be maintained substantially constant regardless of the thermal expansion of the light guide plate.

請求項３に係る発明によれば、前記反射シートは、前記ストッパ部や前記付勢部に接触しない範囲で その面方向に移動したり膨張したりすることが許容され、撓みや座屈の発生（つまり、該面方向への移動や膨張を規制されることに起因する撓みや座屈の発生）を抑制でき、該撓みや座屈に伴う発光ムラの発生を抑制できる。   According to the invention of claim 3, the reflection sheet is allowed to move or expand in the surface direction within a range not contacting the stopper portion or the urging portion, and the occurrence of bending or buckling occurs. In other words, it is possible to suppress the occurrence of bending and buckling due to the restriction of movement and expansion in the surface direction, and it is possible to suppress the occurrence of uneven light emission due to the bending and buckling.

請求項４に係る発明によれば、前記ＬＥＤ光源の熱を前記バネ部材から前記フレーム部材に効率良く伝えることができ、放熱効果を高めて該ＬＥＤ光源の寿命を向上させることができる。   According to the invention which concerns on Claim 4, the heat | fever of the said LED light source can be efficiently transmitted from the said spring member to the said frame member, the heat dissipation effect can be improved and the lifetime of this LED light source can be improved.

図１(a) は、本発明に係る照明装置の構造の一例を示す断面図であり、同図(b) は、ＬＥＤ光源の支持構造等を示す拡大断面図である。FIG. 1A is a cross-sectional view showing an example of the structure of a lighting device according to the present invention, and FIG. 1B is an enlarged cross-sectional view showing a support structure for an LED light source. 図２(a) は、ＬＥＤ光源の支持構造等を示す分解断面図であり、同図(b) は、バネ部材のＡ矢視図である。FIG. 2A is an exploded cross-sectional view showing the support structure of the LED light source and the like, and FIG. 図３は、ＬＥＤ光源の構成の一例を示す斜視図である。FIG. 3 is a perspective view showing an example of the configuration of the LED light source. 図４は、エッジライト型の照明装置の従来構成の一例を示す断面図である。FIG. 4 is a cross-sectional view showing an example of a conventional configuration of an edge light type illumination device.

以下、図１乃至図３に沿って、本発明の実施の形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

本発明に係る照明装置は、図１(a) (b) に符号１で例示するようなエッジライト型の照明装置であって、
・ アクリルやポリカーボネート等の透光性材料で構成された導光板２と、
・ 該導光板２の側面のうちの少なくとも一部の側面（図２(a) の符号２ｃ参照。以下、「光源対向側面」とする）に対向するように配置されて該導光板２内に照明光Ｌ１を出射するＬＥＤ光源３と、
・ 該導光板２の少なくとも一部（つまり、前記光源対向側面２ｃを含む端縁部分）と前記ＬＥＤ光源３の少なくとも一部とを囲繞するように配置されてそれらを収納するフレーム部材４と、
を備えており、該ＬＥＤ光源３から前記光源対向側面２ｃを通って前記導光板２内に出射された光Ｌ１は該導光板２の正面２ａから出射されるように構成されている（符号Ｌ２参照）。なお、本明細書においては、前記導光板２の面のうち前記ＬＥＤ光源３からの光が出射される側の面２ａを「導光板正面」とし、該導光板２の面のうち該導光板正面２ａと反対側の面２ｂを「導光板背面」とする。また、該導光板正面２ａ及び該導光板背面２ｂのうちの任意の一方２ａ又は２ｂを「導光板第１面」とし、他方２ｂ又は２ａを「導光板第２面」とする。 The lighting device according to the present invention is an edge light type lighting device as illustrated by reference numeral 1 in FIGS.
A light guide plate 2 made of a translucent material such as acrylic or polycarbonate;
The light guide plate 2 is disposed so as to face at least a part of the side surfaces of the light guide plate 2 (see reference numeral 2c in FIG. 2 (a); hereinafter referred to as “light source facing side surface”). LED light source 3 that emits illumination light L1,
A frame member 4 disposed so as to surround at least a part of the light guide plate 2 (that is, an edge part including the light source facing side surface 2c) and at least a part of the LED light source 3;
The light L1 emitted from the LED light source 3 through the light source facing side surface 2c into the light guide plate 2 is emitted from the front surface 2a of the light guide plate 2 (reference numeral L2). reference). In the present specification, the surface 2a on the side from which the light from the LED light source 3 is emitted out of the surfaces of the light guide plate 2 is referred to as “front surface of the light guide plate”, and the light guide plate among the surfaces of the light guide plate 2 The surface 2b opposite to the front surface 2a is referred to as a “light guide plate rear surface”. Further, any one 2a or 2b of the light guide plate front surface 2a and the light guide plate rear surface 2b is referred to as a “light guide plate first surface”, and the other 2b or 2a is referred to as a “light guide plate second surface”.

本発明に係る照明装置１は、前記導光板第１面（つまり、前記導光板正面２ａ又は前記導光板背面２ｂのいずれか一方）に直接的に又は他の部材（後述する拡散板８やその他の何らかの部材）を介して間接的に当接される付勢部５ａを備えている。この付勢部５ａは、前記ＬＥＤ光源３に支持されていて、該第１面２ａ又は２ｂに付勢力を与えるように構成されている。また、前記導光板第２面（つまり、前記付勢部５ａが配置されていない方の面である前記導光板正面２ａ又は前記導光板背面２ｂ）に直接的に又は他の部材（後述する拡散板８やその他の何らかの部材）を介して間接的に当接されるようにストッパ部６ｂが配置されている。このストッパ部６ｂは前記ＬＥＤ光源３に支持されていて、前記付勢部５ａに付勢されてなる前記導光板２の板厚方向±ｍの位置を規定するように構成されている。つまり、図１(b) に示す構成では、付勢部５ａは前記反射シート９に接触しない状態で導光板背面（導光板第１面）２ｂに直接的に当接され、ストッパ部６ｂは導光板正面（導光板第２面）２ｂに拡散板８を介して当接されているが、もちろんこれに限られるものではない。付勢部５ａが直接的に又は他の部材を介して間接的に前記導光板正面２ａか前記導光板背面２ｂのいずれかに当接され、ストッパ部６ｂが直接的に又は他の部材を介して間接的に他方の面（つまり、前記導光板正面２ａ及び前記導光板背面２ｂの内、前記付勢部５ａが当接していない方の面）に当接されていれば良い。なお、前記導光板２は、その板厚方向±ｍへの膨張が前記フレーム部材４によって抑制されないようになっている。   The illuminating device 1 according to the present invention is directly on the first surface of the light guide plate (that is, either the light guide plate front surface 2a or the light guide plate rear surface 2b) or another member (a diffuser plate 8 or other described later). And a biasing portion 5a that is indirectly contacted via a certain member. The urging portion 5a is supported by the LED light source 3, and is configured to apply an urging force to the first surface 2a or 2b. Further, the light guide plate second surface (that is, the light guide plate front surface 2a or the light guide plate rear surface 2b which is the surface where the urging portion 5a is not disposed) is directly or other member (a diffusion described later). The stopper portion 6b is arranged so as to be indirectly contacted via the plate 8 or some other member. The stopper portion 6b is supported by the LED light source 3, and is configured to define the position in the plate thickness direction ± m of the light guide plate 2 urged by the urging portion 5a. That is, in the configuration shown in FIG. 1 (b), the urging portion 5a is in direct contact with the rear surface of the light guide plate (light guide plate first surface) 2b without contacting the reflection sheet 9, and the stopper portion 6b is guided. The light plate front surface (second surface of the light guide plate) 2b is in contact with the light diffusion plate 8 through the diffusion plate 8. However, the present invention is not limited to this. The urging portion 5a is brought into contact with either the light guide plate front surface 2a or the light guide plate back surface 2b directly or indirectly via another member, and the stopper portion 6b is directly or via another member. It is only necessary to be in contact with the other surface (that is, the surface of the light guide plate front surface 2a and the light guide plate rear surface 2b that is not in contact with the biasing portion 5a). The light guide plate 2 is prevented from being restrained by the frame member 4 from expanding in the plate thickness direction ± m.

一方、前記フレーム部材４には、図１(b) 及び図２(a) に詳示するように前記ＬＥＤ光源３、前記付勢部５ａ、及び前記ストッパ部６ｂを前記光源対向側面２ｃの法線方向±ｎに移動可能な状態で収納する空間部（以下、“収納空間部”とする）４ｓが形成されている。また、この収納空間部４ｓの内部（具体的には、前記ＬＥＤ光源３の背面側）であって、前記ＬＥＤ光源３と前記フレーム部材４との間（図１(b) に示すように基部６ｃが配置されている場合には、該基部６ｃと該フレーム部材４との間）には圧縮された状態のバネ部材７が配置されていて、該ＬＥＤ光源３を前記導光板２の光源対向側面２ｃの側（図示の右側）に付勢するように構成されている。   On the other hand, the frame member 4 has the LED light source 3, the urging portion 5a, and the stopper portion 6b as shown in FIGS. 1 (b) and 2 (a) in detail. A space portion (hereinafter referred to as “storage space portion”) 4s that is stored so as to be movable in the linear direction ± n is formed. In addition, inside the storage space 4s (specifically, on the back side of the LED light source 3), between the LED light source 3 and the frame member 4 (as shown in FIG. 1B) 6c is disposed, a spring member 7 in a compressed state is disposed between the base portion 6c and the frame member 4), and the LED light source 3 is opposed to the light source of the light guide plate 2. It is configured to urge toward the side surface 2c (the right side in the figure).

本発明によれば、前記導光板２に対向するように配置されたＬＥＤ光源３は前記フレーム部材４に固定されずに前記法線方向±ｎに移動可能に配置されているので、該ＬＥＤ光源３の熱により前記導光板２が前記法線方向＋ｎに膨張したとしても、該ＬＥＤ光源３が前記フレーム部材４との間に押し付けられてしまうというおそれを回避することができる。また、本発明によれば、前記ＬＥＤ光源３は前記バネ部材７によって前記光源対向側面２ｃの側に付勢されるように構成されているので、該ＬＥＤ光源３と該光源対向側面２ｃとが密着することとなり、該ＬＥＤ光源３から出射された光が効率良く前記導光板２に導かれて発光効率を高めることができる。   According to the present invention, the LED light source 3 arranged to face the light guide plate 2 is arranged not to be fixed to the frame member 4 but to be movable in the normal direction ± n. Even if the light guide plate 2 expands in the normal direction + n due to the heat of 3, the risk that the LED light source 3 is pressed against the frame member 4 can be avoided. According to the present invention, the LED light source 3 is configured to be urged toward the light source facing side surface 2c by the spring member 7, so that the LED light source 3 and the light source facing side surface 2c are The light emitted from the LED light source 3 is efficiently guided to the light guide plate 2 to increase the light emission efficiency.

一方、本発明に係る照明装置１においては、前記導光板２の板厚方向±ｍへの熱膨張を許容するために該導光板２と前記フレーム部材４との間には隙間が設けられている。このため、該導光板２は前記収納空間部４ｓ中を該板厚方向±ｍに移動することができ、該導光板２と前記ＬＥＤ光源３との間に該板厚方向±ｍの相対位置ズレが発生することが懸念される。しかし、本発明においては、前記導光板２は前記付勢部５ａにより前記ストッパ部６ｂに押し付けられるので、該導光板２と該ストッパ部６ｂとの相対的な位置関係（前記板厚方向±ｍに関する位置関係）は一定である。また、該ストッパ部６ｂは前記ＬＥＤ光源３に支持されているので、該ストッパ部６ｂと該ＬＥＤ光源３との相対的な位置関係（前記板厚方向±ｍに関する位置関係）も一定である。これにより、前記ＬＥＤ光源３と前記導光板２との相対的な位置関係（前記板厚方向±ｍに関する位置関係）も一定となる。したがって、前記ＬＥＤ光源３から前記光源対向側面２ｃを通って前記導光板２内に出射される光Ｌ１の量はほぼ一定となり、前記導光板２の熱膨張にかかわらず発光効率をほぼ一定に維持することができる。   On the other hand, in the lighting device 1 according to the present invention, a gap is provided between the light guide plate 2 and the frame member 4 in order to allow thermal expansion in the thickness direction ± m of the light guide plate 2. Yes. Therefore, the light guide plate 2 can move in the storage space 4s in the plate thickness direction ± m, and the relative position in the plate thickness direction ± m between the light guide plate 2 and the LED light source 3 There is concern about the occurrence of misalignment. However, in the present invention, since the light guide plate 2 is pressed against the stopper portion 6b by the biasing portion 5a, the relative positional relationship between the light guide plate 2 and the stopper portion 6b (the plate thickness direction ± m The positional relationship) is constant. Further, since the stopper portion 6b is supported by the LED light source 3, the relative positional relationship between the stopper portion 6b and the LED light source 3 (the positional relationship with respect to the plate thickness direction ± m) is also constant. Thereby, the relative positional relationship between the LED light source 3 and the light guide plate 2 (the positional relationship with respect to the plate thickness direction ± m) is also constant. Therefore, the amount of the light L1 emitted from the LED light source 3 through the light source facing side surface 2c into the light guide plate 2 is substantially constant, and the light emission efficiency is maintained substantially constant regardless of the thermal expansion of the light guide plate 2. can do.

ところで、上述の付勢部５ａやストッパ部６ｂは、前記ＬＥＤ光源３に直接固定しても良いが、何らかの部材を介して固定するようにしても良い。例えば、図１(b) 及び図２(a) に例示するように、前記付勢部５ａを支持する部材（本明細書において「支持部」とする）６ａを、前記ＬＥＤ光源３に近接する位置から前記付勢部５ａが配置された位置まで前記導光板第１面２ａ又は２ｂに沿う方向に延設し、前記ストッパ部６ｂを、前記ＬＥＤ光源３に近接する位置から前記導光板第２面２ｂ又は２ａに沿う方向に延設し、さらに、前記支持部６ａにおける前記ＬＥＤ光源３に近接する部分及び前記ストッパ部６ｂにおける前記ＬＥＤ光源３に近接する部分を連結するように基部６ｃを配置し、該基部６ｃを前記ＬＥＤ光源３に固定すると良い。つまり、この例では、前記付勢部５ａは前記支持部６ａ及び前記基部６ｃを介して前記ＬＥＤ光源３に支持されることとなり、前記ストッパ部６ｂは前記基部６ｃを介して前記ＬＥＤ光源３に支持されることとなる。これらの支持部６ａ、ストッパ部６ｂ及び基部６ｃを形成する部材（本明細書において「基板保持部材」とする）６は断面形状を略コ字状にすると良い。なお、図１(b) に示す基板保持部材６は、あくまで好適な一実施態様を例示するものであって、断面が略コ字状以外の形状のものを排除するものではない。また、該基板保持部材６やバネ部材７は、前記フレーム部材４の全長に渡って連続的に配置しておく必要はない。例えば、２ｃｍの長さで断続的に複数配置するようにしても良い。   By the way, although the above-mentioned urging | biasing part 5a and the stopper part 6b may be fixed to the said LED light source 3 directly, you may make it fix through a certain member. For example, as illustrated in FIGS. 1B and 2A, a member 6 a that supports the biasing portion 5 a (referred to as a “supporting portion” in this specification) 6 a is close to the LED light source 3. It extends in a direction along the first light guide plate surface 2a or 2b from the position to the position where the urging portion 5a is disposed, and the stopper portion 6b is moved from the position close to the LED light source 3 to the second light guide plate second position. A base portion 6c is disposed so as to extend in a direction along the surface 2b or 2a and to connect a portion of the support portion 6a adjacent to the LED light source 3 and a portion of the stopper portion 6b adjacent to the LED light source 3 to each other. The base 6c is preferably fixed to the LED light source 3. That is, in this example, the urging portion 5a is supported by the LED light source 3 via the support portion 6a and the base portion 6c, and the stopper portion 6b is attached to the LED light source 3 via the base portion 6c. Will be supported. The members (referred to as “substrate holding members” in this specification) 6 that form the support portion 6a, the stopper portion 6b, and the base portion 6c may have a substantially U-shaped cross section. It should be noted that the substrate holding member 6 shown in FIG. 1 (b) is merely an example of a preferred embodiment, and does not exclude a cross-sectional shape other than a substantially U-shape. Further, the substrate holding member 6 and the spring member 7 do not need to be arranged continuously over the entire length of the frame member 4. For example, a plurality of pieces may be intermittently arranged with a length of 2 cm.

上述した付勢部５ａは樹脂（例えば、ＡＢＳ樹脂）やゴムで形成すると良く、図１(b) 及び図２(a) に例示するように、前記導光板２の板厚方向±ｍに対して傾く薄板状（羽根板状）であってその先端縁部が導光板第２面２ｂ又は２ａに直接的に又は間接的に当接するようにすると良いが、それ以外の材質や構造を排除するものではない。例えば、付勢部５ａにバネ材料を用いても良いし、付勢部５ａと前記ＬＥＤ光源３との間にバネ部材や弾性部材を介装すれば付勢部５ａ自体は剛体にすることも可能である。   The urging portion 5a described above may be formed of resin (for example, ABS resin) or rubber. As illustrated in FIGS. 1 (b) and 2 (a), the light guide plate 2 has a thickness direction ± m. It is preferable that the tip edge part of the thin plate shape (blade plate shape) tilts directly or indirectly against the second light guide plate surface 2b or 2a, but other materials and structures are excluded. It is not a thing. For example, a spring material may be used for the urging unit 5a, or if a spring member or an elastic member is interposed between the urging unit 5a and the LED light source 3, the urging unit 5a itself may be a rigid body. Is possible.

また、前記ＬＥＤ光源３としては、図３に示すように、１枚の基板３Ａに複数の発光素子３Ｂを接続したものとしても良い。因みに、本発明者らが試作した照明装置では、２．３ｍｍ角程度の発光素子３Ｂを長さ６０ｃｍの基板３Ａに３９個取り付けて用いた。   Further, as the LED light source 3, as shown in FIG. 3, a plurality of light emitting elements 3B may be connected to a single substrate 3A. Incidentally, in the lighting device prototyped by the present inventors, 39 light emitting elements 3B of about 2.3 mm square were attached to a substrate 3A having a length of 60 cm and used.

ところで、前記導光板２は、導光板正面２ａ及び導光板背面２ｂの形状を略矩形状としても矩形以外の形状としても良い。また、前記ＬＥＤ光源３は、前記導光板２の全ての側面に対向させて配置しておく必要はなく、少なくとも側面の一部に対向させて配置していれば足りる。例えば、該導光板正面２ａ及び導光板背面２ｂの形状を略矩形状とした場合、前記ＬＥＤ光源３は、
・ ４つの側面の内の１つの側面に対向させて配置しても、
・ ４つの側面の内の２つの側面に対向させて配置しても、
・ ４つの側面の内の３つの側面に対向させて配置しても、
・ ４つの側面の内の４つの側面に対向させて配置しても、
いずれでも良い。 By the way, the light guide plate 2 may have a shape of the light guide plate front surface 2a and the light guide plate back surface 2b of a substantially rectangular shape or a shape other than the rectangular shape. Further, the LED light source 3 does not have to be disposed so as to face all the side surfaces of the light guide plate 2, and may be disposed so as to face at least a part of the side surfaces. For example, when the light guide plate front surface 2a and the light guide plate back surface 2b have a substantially rectangular shape, the LED light source 3
・ Even if it is placed facing one of the four sides,
・ Even if it is placed facing two of the four sides,
・ Even if it is placed opposite to three of the four sides,
・ Even if it is placed facing four of the four sides,
Either is fine.

さらに、前記フレーム部材４は、前記導光板２の全ての端縁を囲繞するように配置することが好ましいが、一部の端縁のみを囲繞する態様のものを本発明の範囲から除外するものではない。また、図１(a) に示す照明装置１では、左端部と右端部とにそれぞれフレーム部材４，４が配置されているが、これらのフレーム部材４，４が連結されていても、連結されていなくても良い。さらに、このフレーム部材４は、複数の部分に分割できるようにしておいて、組み立てや分解が容易となるように構成しておくと良い。   Further, the frame member 4 is preferably arranged so as to surround all the edges of the light guide plate 2, but the aspect of surrounding only a part of the edges is excluded from the scope of the present invention. is not. Moreover, in the illuminating device 1 shown to Fig.1 (a), although the frame members 4 and 4 are each arrange | positioned at the left end part and the right end part, even if these frame members 4 and 4 are connected, it is connected. It does not have to be. Further, the frame member 4 may be divided into a plurality of parts and configured to be easily assembled and disassembled.

一方、光を拡散させるための拡散板（例えば、アクリルシートやポリカーボネートシート）８を前記導光板正面２ａに沿うように配置し、光を反射するための反射シート９を前記導光板背面２ｂに沿うように配置すると良い。その場合は、前記ストッパ部６ｂ及び前記付勢部５ａのうちの一方は、前記拡散板８を介して前記導光板２に間接的に当接されるように配置され、前記ストッパ部６ｂ及び前記付勢部５ａのうちの他方は、前記反射シート９が配置されていない部分で前記導光板２に直接的に当接されるように構成すると良い。そのように構成した場合には、前記反射シート９は、前記ストッパ部６ｂや前記付勢部５ａに接触しない範囲で その面方向に移動したり膨張したりすることが許容され、撓みや座屈の発生（つまり、該面方向への移動や膨張を規制されることに起因する撓みや座屈の発生）を抑制でき、該撓みや座屈に伴う発光ムラの発生を抑制できる。また、撓みやすい材料（例えば、薄い樹脂（ＰＥＴ）シートなど）であっても反射シート９として使用でき、材料の選択の自由度を高くすることができる。   On the other hand, a diffusion plate (for example, an acrylic sheet or a polycarbonate sheet) 8 for diffusing light is arranged along the light guide plate front surface 2a, and a reflection sheet 9 for reflecting light is arranged along the light guide plate back surface 2b. It is good to arrange like this. In that case, one of the stopper portion 6b and the urging portion 5a is disposed so as to indirectly contact the light guide plate 2 via the diffusion plate 8, and the stopper portion 6b and the biasing portion 5a The other of the urging portions 5a may be configured to directly contact the light guide plate 2 at a portion where the reflection sheet 9 is not disposed. In such a configuration, the reflection sheet 9 is allowed to move or expand in the surface direction within a range that does not contact the stopper portion 6b or the biasing portion 5a. (That is, the occurrence of bending and buckling due to the restriction of movement and expansion in the surface direction), and the occurrence of uneven light emission due to the bending and buckling can be suppressed. Moreover, even if it is a material (for example, thin resin (PET) sheet | seat etc.) which is easy to bend, it can be used as the reflective sheet 9, and the freedom degree of selection of material can be made high.

ところで、前記フレーム部材４と前記バネ部材７とを熱伝導に優れた材料（好ましくは、アルミニウム等の金属材料）にて構成しておいて、前記ＬＥＤ光源３の熱が前記バネ部材７及び前記フレーム部材４を介して放散されるように構成しておくと良い。そのようにした場合には、該ＬＥＤ光源３の熱を該バネ部材７から前記フレーム部材４に効率良く伝えることができ、放熱効果を高めて該ＬＥＤ光源３の寿命を向上させることができる。なお、バネ部材７に図２(b) に例示するような断面が略Ｕ字状の板バネ用いた場合には、該バネ部材７と該バネ部材７に隣接される部材（つまり、フレーム部材７や基板保持部材６）との接触面積を広く確保でき、放熱効果を高めることができる。   By the way, the frame member 4 and the spring member 7 are made of a material excellent in heat conduction (preferably, a metal material such as aluminum), and the heat of the LED light source 3 is applied to the spring member 7 and the spring member 7. It may be configured to be dissipated through the frame member 4. In such a case, the heat of the LED light source 3 can be efficiently transferred from the spring member 7 to the frame member 4, and the heat radiation effect can be enhanced to improve the life of the LED light source 3. When a leaf spring having a substantially U-shaped cross section as illustrated in FIG. 2B is used for the spring member 7, the spring member 7 and a member adjacent to the spring member 7 (that is, a frame member). 7 and the substrate holding member 6) can ensure a wide contact area, and the heat dissipation effect can be enhanced.

ところで、図１(b) に示すバネ部材７は、前記フレーム部材４に直接的に当接されているが、もちろんこれに限られるものではなく、何らかの部材を介して前記フレーム部材４に間接的に当接されたものを本発明の範囲から除外するものではない。また、前記付勢部５ａを構成する部材５には、シーリング等の他の機能を持たせるようにしても良い。   Incidentally, the spring member 7 shown in FIG. 1 (b) is in direct contact with the frame member 4, but of course not limited to this, but indirectly to the frame member 4 through some member. It is not excluded from the scope of the present invention. The member 5 constituting the urging portion 5a may have other functions such as sealing.

１ 照明装置
２ 導光板
２ａ 導光板正面（導光板第１面又は導光板第２面）
２ｂ 導光板背面（導光板第１面又は導光板第２面）
２ｃ 光源対向側面
３ ＬＥＤ光源
４ フレーム部材
４ｓ 収納空間部
５ａ 付勢部
６ 基板保持部材
６ａ 支持部
６ｂ ストッパ部
６ｃ 基部
７ バネ部材
８ 拡散板
９ 反射シート
Ｌ１ 照明光
±ｍ 導光板の板厚方向
±ｎ 光源対向側面の法線方向 DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Light guide plate 2a Light guide plate front surface (light guide plate 1st surface or light guide plate 2nd surface)
2b Rear surface of light guide plate (light guide plate first surface or light guide plate second surface)
2c Light source facing side surface 3 LED light source 4 Frame member 4s Storage space portion 5a Energizing portion 6 Substrate holding member 6a Supporting portion 6b Stopper portion 6c Base portion 7 Spring member 8 Diffusing plate 9 Reflecting sheet L 1 Illumination light ± m Thickness of light guide plate Direction ± n Normal direction of the side facing the light source

Claims (4)

透光性材料で構成された導光板と、該導光板の側面のうちの少なくとも一部の側面（以下、「光源対向側面」とする）に対向するように配置されて該導光板内に照明光を出射するＬＥＤ光源と、該導光板の少なくとも一部及び該ＬＥＤ光源の少なくとも一部を囲繞するように配置されてそれらを収納するフレーム部材と、を備えた照明装置において、
前記導光板の面のうち前記ＬＥＤ光源からの光が出射される側の面を「導光板正面」とし、前記導光板の面のうち前記導光板正面と反対側の面を「導光板背面」とし、該導光板正面及び該導光板背面のうちの任意の一方を「導光板第１面」とし他方を「導光板第２面」とした場合に、
前記ＬＥＤ光源に支持されると共に前記導光板第１面に直接的に又は他の部材を介して間接的に当接されることに基づき該第１面に付勢力を与える付勢部と、
前記ＬＥＤ光源に支持されると共に前記導光板第２面に直接的に又は他の部材を介して間接的に当接されることに基づき前記付勢部に付勢されてなる前記導光板の板厚方向の位置を規定するストッパ部と、
前記ＬＥＤ光源、前記付勢部、及び前記ストッパ部を前記光源対向側面の法線方向に移動可能な状態で収納するように前記フレーム部材内に形成された収納空間部と、
前記ＬＥＤ光源と前記フレーム部材との間に配置されることにより、該ＬＥＤ光源を前記導光板の光源対向側面の側に付勢するバネ部材と、
を備えたことを特徴とする照明装置。 A light guide plate made of a light-transmitting material and at least a part of the side surfaces of the light guide plate (hereinafter referred to as “light source facing side surfaces”) are arranged so as to oppose the light guide plate. In a lighting device comprising: an LED light source that emits light; and a frame member that is disposed so as to surround at least a part of the light guide plate and at least a part of the LED light source, and stores them.
Of the surfaces of the light guide plate, the surface on the side from which light from the LED light source is emitted is referred to as “front surface of the light guide plate”, and among the surfaces of the light guide plate, the surface opposite to the front surface of the light guide plate is referred to as “back surface of the light guide plate”. When any one of the front surface of the light guide plate and the back surface of the light guide plate is a “light guide plate first surface” and the other is a “light guide plate second surface”,
An urging portion that is supported by the LED light source and applies an urging force to the first surface based on being brought into direct contact with the first surface of the light guide plate directly or indirectly through another member;
The plate of the light guide plate supported by the LED light source and urged by the urging portion based on being in direct contact with the second surface of the light guide plate directly or indirectly through another member A stopper that defines the position in the thickness direction;
A storage space portion formed in the frame member so as to store the LED light source, the biasing portion, and the stopper portion in a state in which the LED light source, the biasing portion, and the stopper portion are movable in a normal direction of the light source facing side surface;
A spring member for biasing the LED light source toward the light source facing side of the light guide plate by being disposed between the LED light source and the frame member;
An illumination device comprising: 前記ＬＥＤ光源に近接する位置から前記導光板第１面に沿う方向に延設されて前記付勢部を支持する支持部と、前記ＬＥＤ光源に近接する位置から前記導光板第２面に沿う方向に延設された前記ストッパ部と、前記支持部における前記ＬＥＤ光源に近接する部分及び前記ストッパ部における前記ＬＥＤ光源に近接する部分を連結するように配置されると共に該ＬＥＤ光源に固定されてなる基部と、により断面が略コ字状に形成された基板保持部材、
を備えたことを特徴とする請求項１に記載の照明装置。 A support portion that extends in a direction along the first surface of the light guide plate from a position close to the LED light source and supports the biasing portion, and a direction along the second surface of the light guide plate from a position close to the LED light source The stopper portion that is extended to the portion, the portion of the support portion that is close to the LED light source, and the portion of the stopper portion that is close to the LED light source are connected and fixed to the LED light source. A substrate holding member having a substantially U-shaped cross section by the base,
The illumination device according to claim 1, comprising: 光を拡散させるための拡散板が前記導光板正面に沿うように配置され、
光を反射するための反射シートが前記導光板背面に沿うように配置され、
前記ストッパ部及び前記付勢部のうちの一方は、前記拡散板を介して前記導光板に間接的に当接されるように配置され、
前記ストッパ部及び前記付勢部のうちの他方は、前記反射シートが配置されていない部分で前記導光板に直接的に当接されるように構成された、
ことを特徴とする請求項１又は２に記載の照明装置。 A diffusion plate for diffusing light is disposed along the front surface of the light guide plate,
A reflective sheet for reflecting light is arranged along the back of the light guide plate,
One of the stopper part and the urging part is disposed so as to be indirectly in contact with the light guide plate via the diffusion plate,
The other of the stopper portion and the urging portion is configured to directly contact the light guide plate at a portion where the reflection sheet is not disposed.
The illumination device according to claim 1, wherein 前記フレーム部材と前記バネ部材とが熱伝導に優れた材料にて構成され、
前記ＬＥＤ光源の熱が前記バネ部材及び前記フレーム部材を介して放散されるように構成された、
ことを特徴とする請求項１乃至３のいずれか１項に記載の照明装置。 The frame member and the spring member are made of a material excellent in heat conduction,
The heat of the LED light source is configured to be dissipated through the spring member and the frame member.
The lighting device according to any one of claims 1 to 3, wherein
JP2012238694A 2012-10-30 2012-10-30 Lighting device Pending JP2014089864A (en)

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PCT/KR2013/008684 WO2014069791A1 (en) 2012-10-30 2013-09-27 Lighting apparatus

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