JP4997136B2 - Lighting device, signboard lighting device, and backlight device for direct type liquid crystal panel - Google Patents

Lighting device, signboard lighting device, and backlight device for direct type liquid crystal panel Download PDF

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JP4997136B2
JP4997136B2 JP2008035547A JP2008035547A JP4997136B2 JP 4997136 B2 JP4997136 B2 JP 4997136B2 JP 2008035547 A JP2008035547 A JP 2008035547A JP 2008035547 A JP2008035547 A JP 2008035547A JP 4997136 B2 JP4997136 B2 JP 4997136B2
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light
convex lens
optical axis
main optical
illumination device
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伸治 松田
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Stanley Electric Co Ltd
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Description

本発明は、青色系の光を発光する発光素子が概略すり鉢状のリフレクタによって取り囲まれ、そのリフレクタによって取り囲まれる空間に、発光素子からの青色系の光によって励起されて黄色系の蛍光を発する蛍光体を含有する光透過性封止部材が充填され、発光素子からの青色系の光と蛍光体からの黄色系の蛍光とが混ざった白色光を放射するように白色LEDが構成され、白色LEDからの光を配光制御するための凸レンズが設けられ、白色LEDからの光が入射される入射面が、凸レンズの表面のうち、白色LEDの光透過性封止部材に対向する位置に形成された照明装置、看板照明装置および直下型液晶パネル用バックライト装置に関する。   According to the present invention, a light emitting element that emits blue light is surrounded by a roughly mortar-shaped reflector, and a fluorescent light that is excited by blue light from the light emitting element and emits yellow fluorescent light in a space surrounded by the reflector. A white LED is configured to emit white light, which is filled with a light-transmitting sealing member containing a body and emits white light in which blue light from a light emitting element and yellow fluorescent light from a phosphor are mixed. A convex lens for controlling the light distribution from the white LED is provided, and an incident surface on which light from the white LED is incident is formed at a position facing the light-transmissive sealing member of the white LED on the surface of the convex lens. The present invention relates to a lighting device, a signboard lighting device, and a backlight device for a direct type liquid crystal panel.

特に、本発明は、凸レンズからの照射光に黄色の色ムラが形成されてしまうのを回避しつつ、凸レンズを小型化することができる照明装置、看板照明装置および直下型液晶パネル用バックライト装置に関する。   In particular, the present invention relates to an illumination device, a signboard illumination device, and a backlight device for a direct type liquid crystal panel that can reduce the size of the convex lens while avoiding the formation of yellow color unevenness in the light emitted from the convex lens. About.

従来から、青色系の光を発光する発光素子が概略すり鉢状のリフレクタによって取り囲まれ、そのリフレクタによって取り囲まれる空間に、発光素子からの青色系の光によって励起されて黄色系の蛍光を発する蛍光体を含有する光透過性封止部材が充填され、発光素子からの青色系の光と蛍光体からの黄色系の蛍光とが混ざった白色光を放射するように白色LEDが構成され、白色LEDからの光を配光制御するための凸レンズが設けられ、白色LEDからの光が入射される入射面が、凸レンズの表面のうち、白色LEDの光透過性封止部材に対向する位置に形成された照明装置が知られている。この種の照明装置の例としては、例えば特開2005−216782号公報の図1、図5、図8に記載されたものがある。   Conventionally, a light emitting element that emits blue light is surrounded by a roughly mortar-shaped reflector, and a phosphor that emits yellowish fluorescence when excited by blue light from the light emitting element is surrounded by the reflector. The white LED is configured to emit white light in which blue light from the light emitting element and yellow fluorescent light from the phosphor are mixed. A convex lens for controlling the light distribution of the white LED is provided, and an incident surface on which light from the white LED is incident is formed at a position facing the light-transmissive sealing member of the white LED on the surface of the convex lens. Lighting devices are known. Examples of this type of lighting device include those described in FIGS. 1, 5, and 8 of JP-A-2005-216682, for example.

特開2005−216782号公報の図1、図5、図8に記載された照明装置では、青色系の光を発光する発光素子と、その発光素子を取り囲む概略すり鉢状のリフレクタと、そのリフレクタによって取り囲まれる空間に充填された光透過性封止部材とによって、白色LEDが構成されている。   In the illuminating device described in Japanese Patent Application Laid-Open No. 2005-216682, FIG. 1, FIG. 5, and FIG. 8, a light emitting element that emits blue light, a roughly mortar-shaped reflector that surrounds the light emitting element, and the reflector A white LED is constituted by the light-transmitting sealing member filled in the enclosed space.

詳細には、特開2005−216782号公報の図1、図5、図8に記載された照明装置では、発光素子からの青色系の光によって励起されて黄色系の蛍光を発する蛍光体が、光透過性封止部材に含有せしめられている。更に、発光素子からの青色系の光と、蛍光体からの黄色系の蛍光とが、光透過性封止部材内で混ざり合い、その混ざり合った白色光が光透過性封止部材から放射されるように、白色LEDが構成されている。   Specifically, in the illumination device described in FIGS. 1, 5, and 8 of JP-A-2005-216682, a phosphor that emits yellow fluorescence when excited by blue light from a light-emitting element, It is contained in the light transmissive sealing member. Further, blue light from the light emitting element and yellow fluorescent light from the phosphor are mixed in the light-transmitting sealing member, and the mixed white light is emitted from the light-transmitting sealing member. Thus, a white LED is configured.

ところで、そのように構成された白色LEDが用いられている特開2005−216782号公報の図1、図5、図8に記載された照明装置では、光透過性封止部材内の蛍光体によって黄色系に変換される割合が低い青色を帯びた白色光が、光透過性封止部材の中央部付近から放射され、光透過性封止部材内の蛍光体によって黄色系に変換される割合が高い黄色を帯びた白色光が、光透過性封止部材の外周部付近から放射される。   By the way, in the illuminating device described in FIG.1, FIG.5, FIG.8 of Unexamined-Japanese-Patent No. 2005-216682 using the white LED comprised in that way, by the fluorescent substance in a light-transmissive sealing member, The proportion of blue light that is converted to yellow is low, and is emitted from the vicinity of the center of the light-transmitting sealing member, and is converted to yellow by the phosphor in the light-transmitting sealing member. High yellowish white light is emitted from the vicinity of the outer periphery of the light-transmitting sealing member.

つまり、特開2005−216782号公報の図1、図5、図8に記載された照明装置では、光透過性封止部材の外周部付近から放射される光に含まれる黄色光の割合が、光透過性封止部材の中央部付近から放射される光に含まれる黄色光の割合よりも高くなっている。   That is, in the illuminating device described in FIGS. 1, 5, and 8 of JP-A-2005-216682, the ratio of yellow light contained in the light emitted from the vicinity of the outer peripheral portion of the light-transmitting sealing member is The ratio is higher than the ratio of yellow light contained in the light emitted from the vicinity of the central portion of the light-transmitting sealing member.

仮に、黄色光の割合が高い光透過性封止部材の外周部付近からの光が、凸レンズを介して照明装置の照射方向にそのまま照射されると、凸レンズからの照射光に黄色の色ムラが形成されてしまう。   If light from the vicinity of the outer periphery of the light-transmitting sealing member having a high yellow light ratio is irradiated as it is in the irradiation direction of the illumination device via the convex lens, yellow color unevenness is generated in the irradiation light from the convex lens. Will be formed.

そこで、特開2005−216782号公報の図1、図5、図8に記載された照明装置では、周辺反射面が凸レンズに設けられている。詳細には、黄色光の割合が高い光透過性封止部材の外周部付近からの光が、凸レンズの周辺反射面によって反射され、黄色光の割合が低い光透過性封止部材の中央部付近からの光の照射エリアの中心方向に照射される。   Therefore, in the illumination device described in FIGS. 1, 5, and 8 of Japanese Patent Application Laid-Open No. 2005-216682, the peripheral reflection surface is provided on the convex lens. Specifically, light from the vicinity of the outer periphery of the light-transmitting sealing member having a high yellow light ratio is reflected by the peripheral reflecting surface of the convex lens, and near the center of the light-transmitting sealing member having a low yellow light ratio It is irradiated in the center direction of the irradiation area of the light from.

それにより、特開2005−216782号公報の図1、図5、図8に記載された照明装置では、凸レンズからの照射光に黄色の色ムラが形成されてしまうのを回避することができる。   Thereby, in the illuminating device described in FIG. 1, FIG. 5, FIG. 8 of Japanese Patent Laid-Open No. 2005-216682, it is possible to avoid yellow color unevenness from being formed in the irradiation light from the convex lens.

ところで、特開2005−216782号公報の図1、図5、図8に記載された照明装置では、凸レンズの周辺反射面が、凸レンズの入射面から凸レンズの径方向にかなり離れた位置に形成されている。つまり、凸レンズの周辺反射面が、凸レンズの径方向に大きく突出している。   By the way, in the illuminating device described in FIG. 1, FIG. 5, FIG. 8 of Japanese Patent Laid-Open No. 2005-216682, the peripheral reflection surface of the convex lens is formed at a position that is considerably separated from the incident surface of the convex lens in the radial direction of the convex lens. ing. That is, the peripheral reflecting surface of the convex lens protrudes greatly in the radial direction of the convex lens.

そのため、特開2005−216782号公報の図1、図5、図8に記載された照明装置では、凸レンズからの照射光に黄色の色ムラが形成されてしまうのを回避することができるものの、凸レンズが大型化してしまう。   Therefore, in the illumination device described in FIGS. 1, 5, and 8 of Japanese Patent Application Laid-Open No. 2005-216682, although it is possible to avoid the formation of yellow color unevenness in the irradiation light from the convex lens, The convex lens becomes large.

特開2005−216782号公報の図1、図5、図8FIG. 1, FIG. 5, FIG. 8 of JP-A-2005-216682

前記問題点に鑑み、本発明は、凸レンズからの照射光に黄色の色ムラが形成されてしまうのを回避しつつ、凸レンズを小型化することができる照明装置、看板照明装置および直下型液晶パネル用バックライト装置を提供することを目的とする。   In view of the above problems, the present invention provides an illumination device, a signboard illumination device, and a direct-type liquid crystal panel that can reduce the size of the convex lens while avoiding the formation of yellow color unevenness in the irradiation light from the convex lens. An object of the present invention is to provide a backlight device.

請求項1に記載の発明によれば、青色系の光を発光する発光素子(1a)が概略すり鉢状のリフレクタ(1b)によって取り囲まれ、そのリフレクタ(1b)によって取り囲まれる空間に、発光素子(1a)からの青色系の光によって励起されて黄色系の蛍光を発する蛍光体を含有する光透過性封止部材(1c)が充填され、発光素子(1a)からの青色系の光と蛍光体からの黄色系の蛍光とが混ざった白色光を放射するように白色LED(1)が構成され、白色LED(1)からの光を配光制御するための凸レンズ(2)が設けられ、白色LED(1)からの光が入射される入射面(2a)が、凸レンズ(2)の表面のうち、白色LED(1)の光透過性封止部材(1c)に対向する位置に形成されている照明装置(10)において、蛍光体によって黄色系に変換される割合が低い光透過性封止部材(1c)の中央部(1c1)付近からの光(L1,L2,L3,L4)が、照明装置の主光軸線(CL)と大きい角度(θ1,θ2,θ3,θ4)をなして凸レンズ(2)から照射され、かつ、蛍光体によって黄色系に変換される割合が高い光透過性封止部材(1c)の外周部(1c2)付近からの光(L5)が、照明装置の主光軸線(CL)と小さい角度(θ5)をなして凸レンズ(2)から照射されるように、凸レンズ(2)の入射面(2a)が、複数の凹部(2a1)と複数の凸部(2a2)とを有する凹凸形状に形成されていることを特徴とする照明装置(10)が提供される。   According to the first aspect of the present invention, the light emitting element (1a) that emits blue light is surrounded by the substantially mortar-shaped reflector (1b), and the light emitting element (1b) is surrounded by the reflector (1b). A light-transmitting sealing member (1c) containing a phosphor that emits yellow fluorescence when excited by blue light from 1a) is filled, and blue light and phosphor from the light emitting element (1a) are filled. The white LED (1) is configured to emit white light mixed with yellow fluorescent light from the white LED, and a convex lens (2) for controlling light distribution from the white LED (1) is provided. The incident surface (2a) on which light from the LED (1) is incident is formed at a position facing the light-transmissive sealing member (1c) of the white LED (1) on the surface of the convex lens (2). In the lighting device (10) The light (L1, L2, L3, L4) from the vicinity of the central portion (1c1) of the light-transmitting sealing member (1c) that is converted into a yellow color due to the main optical axis (CL) of the illumination device The outer peripheral portion (1c2) of the light-transmitting sealing member (1c) that is irradiated from the convex lens (2) at a large angle (θ1, θ2, θ3, θ4) and that has a high ratio of being converted to yellow by the phosphor. ) The incident surface (2a) of the convex lens (2) is irradiated so that light (L5) from the vicinity is irradiated from the convex lens (2) at a small angle (θ5) with the main optical axis (CL) of the illumination device. An illuminating device (10) is provided that is formed in a concavo-convex shape having a plurality of concave portions (2a1) and a plurality of convex portions (2a2).

請求項2に記載の発明によれば、照明装置の主光軸線(CL)を中心に照明装置の主光軸線(CL)と約10〜20°をなす複数の線分(A1,A2,A3,A4)を回転させることにより、複数の凹部(2a1)および複数の凸部(2a2)の側壁(2a3)を形成し、隣接する2個の環状の凸部(2a2)のピッチ(P)の約5分の1の大きさの半径(R1,R2)を有する複数の円弧を、照明装置の主光軸線(CL)を中心に回転させることにより、凹部(2a1)の底部(2a1a)と凸部(2a2)の頂部(2a2a)とを形成し、それにより、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が最も高く、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度の約75%になる配光特性を形成することを特徴とする請求項1に記載の照明装置(10)が提供される。   According to the second aspect of the present invention, a plurality of line segments (A1, A2, A3) that form about 10 to 20 degrees with the main optical axis (CL) of the lighting device around the main optical axis (CL) of the lighting device. , A4) to form the side walls (2a3) of the plurality of recesses (2a1) and the plurality of projections (2a2), and the pitch (P) of the two adjacent annular projections (2a2) By rotating a plurality of circular arcs having a radius (R1, R2) of about one-fifth about the main optical axis (CL) of the illumination device, the bottom (2a1a) of the recess (2a1) and the convex The top part (2a2a) of the part (2a2) is formed, whereby the luminous intensity of the light emitted from the convex lens (2) is about 50 ° with the main optical axis (CL) of the illumination apparatus, and the illumination apparatus The intensity of light emitted from the convex lens (2) in the direction of the main optical axis (CL) of Illumination according to claim 1, characterized in that it forms a light distribution characteristic which is approximately 50% of the intensity of light emitted from the convex lens (2) at approximately 50 ° with the main optical axis (CL) of the device. An apparatus (10) is provided.

請求項3に記載の発明によれば、樹脂材料の成形によって凸レンズ(2)を形成し、隣接する2個の環状の凸部(2a2)のピッチ(P)を約1mmに設定し、半径(R2)が約0.2mmの円弧を、照明装置の主光軸線(CL)を中心に回転させることにより、凸部(2a2)の頂部(2a2a)を形成したことを特徴とする請求項2に記載の照明装置(10)が提供される。   According to the third aspect of the present invention, the convex lens (2) is formed by molding the resin material, the pitch (P) of the two adjacent annular convex portions (2a2) is set to about 1 mm, and the radius ( The top part (2a2a) of the convex part (2a2) is formed by rotating an arc having a radius of about 0.2 mm about the main optical axis (CL) of the illumination device. The described lighting device (10) is provided.

請求項4に記載の発明によれば、凹部(2a1)の底部(2a1a)を照明装置の主光軸線(CL)上に配置し、凸レンズ(2)の出射面(2b)に凸状面部(2b1)と平面部(2b2)とを形成し、平面部(2b2)を照明装置の主光軸線(CL)上に配置したことを特徴とする請求項3に記載の照明装置(10)が提供される。   According to invention of Claim 4, the bottom part (2a1a) of a recessed part (2a1) is arrange | positioned on the main optical axis (CL) of an illuminating device, and a convex surface part (2b) on the output surface (2b) of a convex lens (2). The lighting device (10) according to claim 3, characterized in that a flat portion (2b2) is formed on the main optical axis (CL) of the lighting device. Is done.

請求項5に記載の発明によれば、複数の概略円錐台状の穴(2a’)を凸レンズ(2)の入射面(2a)に形成することにより、複数の凹部(2a1)と複数の凸部(2a2)とを凸レンズ(2)の入射面(2a)に形成し、円錐台状の穴(2a’)の中心軸線を中心に複数の円弧を回転させることにより、凹部(2a1)の底部(2a1a)と凸部(2a2)の頂部(2a2a)とを形成し、それにより、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度よりも高い配光特性を形成することを特徴とする請求項1に記載の照明装置(10)が提供される。   According to the fifth aspect of the present invention, the plurality of concave portions (2a1) and the plurality of convex portions are formed by forming the plurality of substantially frustoconical holes (2a ′) on the incident surface (2a) of the convex lens (2). The bottom part of the concave part (2a1) is formed by forming a part (2a2) on the incident surface (2a) of the convex lens (2) and rotating a plurality of arcs around the central axis of the frustoconical hole (2a '). (2a1a) and the top part (2a2a) of the convex part (2a2), thereby making the luminous intensity of the light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illumination device. A lighting device (10) according to claim 1, characterized in that it forms a light distribution characteristic higher than the luminous intensity of the light irradiated from the convex lens (2) in the direction of the main optical axis (CL) of the lighting device. Is done.

請求項6に記載の発明によれば、請求項2〜5のいずれか一項に記載の照明装置(10)が複数設けられ、複数の照明装置(10)が照明装置の主光軸線(CL)に直交する方向に間隔Aを隔てて配列され、照明装置(10)の凸レンズ(2)からの照射光によって照射される看板(21)が、間隔Aの約2分の1の距離Bだけ照明装置(10)から照明装置の主光軸線(CL)方向に離間せしめられて配置されていることを特徴とする看板照明装置(20)が提供される。   According to the invention described in claim 6, a plurality of the illumination devices (10) according to any one of claims 2 to 5 are provided, and the plurality of illumination devices (10) are the main optical axis (CL) of the illumination device. The signboards (21) that are arranged at intervals A in the direction orthogonal to the projections and are irradiated by the irradiation light from the convex lens (2) of the illumination device (10) are only distance B that is about one half of the interval A. There is provided a signboard illumination device (20) characterized in that the illumination device (10) is arranged so as to be separated from the illumination device (10) in the main optical axis (CL) direction.

請求項7に記載の発明によれば、請求項2〜5のいずれか一項に記載の照明装置(10)が複数設けられ、複数の照明装置(10)が照明装置の主光軸線(CL)に直交する方向に間隔Cを隔てて配列され、照明装置(10)の凸レンズ(2)からの照射光によって照射される液晶パネル(31)が、間隔Cの約2分の1の距離Dだけ照明装置(10)から照明装置の主光軸線(CL)方向に離間せしめられて配置されていることを特徴とする直下型液晶パネル用バックライト装置(30)が提供される。   According to the invention described in claim 7, a plurality of the illumination devices (10) according to any one of claims 2 to 5 are provided, and the plurality of illumination devices (10) are the main optical axis (CL) of the illumination device. The liquid crystal panel (31), which is arranged at a distance C in a direction orthogonal to) and is irradiated with the irradiation light from the convex lens (2) of the illumination device (10), is a distance D that is approximately one half of the distance C. A direct-type liquid crystal panel backlight device (30) is provided, which is disposed only apart from the illumination device (10) in the main optical axis (CL) direction of the illumination device.

請求項1に記載の照明装置(10)では、青色系の光を発光する発光素子(1a)が概略すり鉢状のリフレクタ(1b)によって取り囲まれている。また、リフレクタ(1b)によって取り囲まれる空間に、発光素子(1a)からの青色系の光によって励起されて黄色系の蛍光を発する蛍光体を含有する光透過性封止部材(1c)が充填されている。更に、発光素子(1a)からの青色系の光と蛍光体からの黄色系の蛍光とが混ざった白色光を放射するように、白色LED(1)が構成されている。   In the illumination device (10) according to claim 1, the light emitting element (1a) emitting blue light is surrounded by a substantially mortar-shaped reflector (1b). The space surrounded by the reflector (1b) is filled with a light-transmitting sealing member (1c) containing a phosphor that emits yellow fluorescence when excited by blue light from the light emitting element (1a). ing. Further, the white LED (1) is configured so as to emit white light in which blue light from the light emitting element (1a) and yellow fluorescent light from the phosphor are mixed.

更に、請求項1に記載の照明装置(10)では、白色LED(1)からの光を配光制御するための凸レンズ(2)が設けられている。また、白色LED(1)からの光が入射される入射面(2a)が、凸レンズ(2)の表面のうち、白色LED(1)の光透過性封止部材(1c)に対向する位置に形成されている。   Furthermore, in the illuminating device (10) of Claim 1, the convex lens (2) for controlling light distribution of the light from white LED (1) is provided. In addition, the incident surface (2a) on which light from the white LED (1) is incident is located on the surface of the convex lens (2) at a position facing the light-transmissive sealing member (1c) of the white LED (1). Is formed.

詳細には、請求項1に記載の照明装置(10)では、蛍光体によって黄色系に変換される割合が低い光透過性封止部材(1c)の中央部(1c1)付近からの光(L1,L2,L3,L4)が、照明装置の主光軸線(CL)と大きい角度(θ1,θ2,θ3,θ4)をなして凸レンズ(2)から照射され、かつ、蛍光体によって黄色系に変換される割合が高い光透過性封止部材(1c)の外周部(1c2)付近からの光(L5)が、照明装置の主光軸線(CL)と小さい角度(θ5)をなして凸レンズ(2)から照射されるように、凸レンズ(2)の入射面(2a)が、複数の凹部(2a1)と複数の凸部(2a2)とを有する凹凸形状に形成されている。   In detail, in the illuminating device (10) according to claim 1, light (L1) from the vicinity of the central portion (1c1) of the light-transmitting sealing member (1c) having a low ratio of being converted to yellow by the phosphor. , L2, L3, L4) are irradiated from the convex lens (2) at a large angle (θ1, θ2, θ3, θ4) with the main optical axis (CL) of the illuminating device, and converted to yellow by the phosphor The light (L5) from the vicinity of the outer peripheral portion (1c2) of the light-transmitting sealing member (1c) having a high ratio is formed at a small angle (θ5) with the main optical axis (CL) of the illuminating device (2) The incident surface (2a) of the convex lens (2) is formed in a concavo-convex shape having a plurality of concave portions (2a1) and a plurality of convex portions (2a2).

つまり、特開2005−216782号公報の図1、図5、図8に記載された照明装置のように、蛍光体によって黄色系に変換される割合が高い光透過性封止部材の外周部付近からの光が、凸レンズの入射面から凸レンズの径方向にかなり離れた位置に配置されている周辺反射面により、蛍光体によって黄色系に変換される割合が低い光透過性封止部材の中央部付近からの光の照射エリアの中心付近に指向せしめられるのではなく、請求項1に記載の照明装置(10)では、蛍光体によって黄色系に変換される割合が高い光透過性封止部材(1c)の外周部(1c2)付近からの光(L5)が、白色LED(1)の光透過性封止部材(1c)に対向する位置に配置されている凸レンズ(2)の入射面(2a)により、蛍光体によって黄色系に変換される割合が低い光透過性封止部材(1c)の中央部(1c1)付近からの光(L1,L2,L3,L4)の照射エリアの中心付近に指向せしめられる。   That is, in the vicinity of the outer peripheral portion of the light-transmitting sealing member that has a high ratio of being converted to a yellow color by the phosphor as in the lighting device described in FIG. 1, FIG. 5, and FIG. The central portion of the light-transmitting sealing member that has a low rate of being converted to yellow by the phosphor by the peripheral reflection surface arranged at a position that is considerably away from the incident surface of the convex lens in the radial direction of the convex lens Rather than being directed to the vicinity of the center of the light irradiation area from the vicinity, in the illumination device (10) according to claim 1, a light-transmitting sealing member (10) having a high ratio of being converted to yellow by the phosphor. The incident surface (2a) of the convex lens (2) where the light (L5) from the vicinity of the outer peripheral part (1c2) of 1c) is disposed at a position facing the light-transmitting sealing member (1c) of the white LED (1). ) Light from the central portion (1c1) near the low percentage light transmissive sealing member (1c) which is conversion (L1, L2, L3, L4) is caused to directed near the center of the irradiation area.

そのため、請求項1に記載の照明装置(10)によれば、特開2005−216782号公報の図1、図5、図8に記載された照明装置よりも凸レンズ(2)を小型化しつつ、凸レンズ(2)からの照射光に黄色の色ムラが形成されてしまうのを回避することができる。   Therefore, according to the illuminating device (10) described in claim 1, while making the convex lens (2) smaller than the illuminating device described in FIG. 1, FIG. 5, FIG. It is possible to avoid the formation of yellow color unevenness in the irradiation light from the convex lens (2).

換言すれば、請求項1に記載の照明装置(10)によれば、凸レンズ(2)からの照射光に黄色の色ムラが形成されてしまうのを回避しつつ、凸レンズ(2)を小型化することができる。   In other words, according to the illumination device (10) of the first aspect, the convex lens (2) is reduced in size while avoiding yellow color unevenness being formed in the irradiation light from the convex lens (2). can do.

請求項2に記載の照明装置(10)では、照明装置の主光軸線(CL)を中心に照明装置の主光軸線(CL)と約10〜20°をなす複数の線分(A1,A2,A3,A4)を回転させることにより、複数の凹部(2a1)および複数の凸部(2a2)の側壁(2a3)が形成されている。   In the illuminating device (10) according to claim 2, a plurality of line segments (A1, A2) forming about 10 to 20 degrees with the main optical axis (CL) of the illuminating device centering on the main optical axis (CL) of the illuminating device. , A3, A4) are rotated to form the plurality of recesses (2a1) and the side walls (2a3) of the plurality of projections (2a2).

更に、請求項2に記載の照明装置(10)では、隣接する2個の環状の凸部(2a2)のピッチ(P)の約5分の1の大きさの半径(R1,R2)を有する複数の円弧を、照明装置の主光軸線(CL)を中心に回転させることにより、凹部(2a1)の底部(2a1a)と凸部(2a2)の頂部(2a2a)とが形成されている。   Furthermore, in the illuminating device (10) according to claim 2, it has a radius (R1, R2) that is about one fifth of the pitch (P) of the two adjacent annular projections (2a2). By rotating a plurality of arcs around the main optical axis (CL) of the illumination device, the bottom (2a1a) of the recess (2a1) and the top (2a2a) of the projection (2a2) are formed.

つまり、請求項2に記載の照明装置(10)では、照明装置の主光軸線(CL)を中心とする環状の凹部(2a1)と環状の凸部(2a2)とが、凸レンズ(2)の入射面(2a)に形成されている。   That is, in the illuminating device (10) according to claim 2, the annular concave portion (2a1) and the annular convex portion (2a2) centering on the main optical axis (CL) of the illuminating device are formed by the convex lens (2). It is formed on the incident surface (2a).

詳細には、請求項2に記載の照明装置(10)では、白色LED(1)からの光の一部(L6,L7)が、凸レンズ(2)の入射面(2a)の凹部(2a1)の底部(2a1a)および凸部(2a2)の頂部(2a2a)に対してほぼ垂直に入射されると共に、白色LED(1)からの光の一部(L1,L2,L3,L4)が、凸レンズ(2)の入射面(2a)の凹部(2a1)および凸部(2a2)の側壁(2a3)で大きく屈折し、凸レンズ(2)に入射される。   Specifically, in the illumination device (10) according to claim 2, a part of the light (L6, L7) from the white LED (1) is converted into the recess (2a1) of the incident surface (2a) of the convex lens (2). Are incident substantially perpendicularly to the bottom (2a1a) and the top (2a2a) of the convex portion (2a2), and part of the light (L1, L2, L3, L4) from the white LED (1) is a convex lens. The light is greatly refracted at the concave portion (2a1) of the incident surface (2a) of (2) and the side wall (2a3) of the convex portion (2a2) and is incident on the convex lens (2).

その結果、請求項2に記載の照明装置(10)では、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が最も高く、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度の約75%になる配光特性が形成される。   As a result, in the illuminating device (10) according to claim 2, the luminous intensity of the light irradiated from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illuminating device is the highest, The luminous intensity of the light emitted from the convex lens (2) in the direction of the principal optical axis (CL) is approximately 50 ° of the luminous intensity of the light emitted from the convex lens (2) with the main optical axis (CL) of the illumination device being about 50 °. A light distribution characteristic of 75% is formed.

換言すれば、請求項2に記載の照明装置(10)によれば、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度よりも高い配光特性(PT2)を形成することができる。   In other words, according to the illuminating device (10) of claim 2, the luminous intensity of light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illuminating device is The light distribution characteristic (PT2) higher than the luminous intensity of the light irradiated from the convex lens (2) in the main optical axis (CL) direction can be formed.

請求項3に記載の照明装置(10)では、樹脂材料の成形によって凸レンズ(2)が形成されている。また、隣接する2個の環状の凸部(2a2)のピッチ(P)が約1mmに設定されている。更に、半径(R2)が約0.2mmの円弧を、照明装置の主光軸線(CL)を中心に回転させることにより、凸部(2a2)の頂部(2a2a)が形成されている。   In the illumination device (10) according to claim 3, the convex lens (2) is formed by molding a resin material. Further, the pitch (P) between two adjacent annular convex portions (2a2) is set to about 1 mm. Furthermore, the top part (2a2a) of the convex part (2a2) is formed by rotating an arc having a radius (R2) of about 0.2 mm around the main optical axis (CL) of the illumination device.

そのため、請求項3に記載の照明装置(10)によれば、半径(R2)が約0.2mm未満の円弧を照明装置の主光軸線(CL)を中心に回転させることにより凸部(2a2)の頂部(2a2a)が形成される場合よりも、凸レンズ(2)の成形用金型コストを抑制することができる。   Therefore, according to the illuminating device (10) of claim 3, the convex portion (2a2) is obtained by rotating an arc having a radius (R2) of less than about 0.2 mm around the main optical axis (CL) of the illuminating device. ) Can be reduced as compared with the case where the top (2a2a) is formed.

請求項4に記載の照明装置(10)では、凸レンズ(2)の入射面(2a)の凹部(2a1)の底部(2a1a)が、照明装置の主光軸線(CL)上に配置されている。また、凸レンズ(2)の出射面(2b)に凸状面部(2b1)と平面部(2b2)とが形成されている。更に、凸レンズ(2)の出射面(2b)の平面部(2b2)が照明装置の主光軸線(CL)上に配置されている。   In the illumination device (10) according to claim 4, the bottom (2a1a) of the recess (2a1) of the incident surface (2a) of the convex lens (2) is disposed on the main optical axis (CL) of the illumination device. . A convex surface portion (2b1) and a flat surface portion (2b2) are formed on the exit surface (2b) of the convex lens (2). Furthermore, the plane part (2b2) of the exit surface (2b) of the convex lens (2) is disposed on the main optical axis (CL) of the illumination device.

そのため、請求項4に記載の照明装置(10)によれば、白色LED(1)の光透過性封止部材(1c)の中央部(1c1)から照明装置の主光軸線(CL)に沿って放射された光(L6)を、凸レンズ(2)の出射面(2b)の平面部(2b2)から照明装置の主光軸線(CL)に沿って照射することができる。   Therefore, according to the illuminating device (10) of Claim 4, it follows along the main optical axis (CL) of the illuminating device from the center part (1c1) of the light-transmissive sealing member (1c) of the white LED (1). The emitted light (L6) can be irradiated along the main optical axis (CL) of the illuminating device from the plane portion (2b2) of the exit surface (2b) of the convex lens (2).

請求項5に記載の照明装置(10)では、複数の概略円錐台状の穴(2a’)を凸レンズ(2)の入射面(2a)に形成することにより、複数の凹部(2a1)と複数の凸部(2a2)とが凸レンズ(2)の入射面(2a)に形成されている。更に、円錐台状の穴(2a’)の中心軸線を中心に複数の円弧を回転させることにより、凹部(2a1)の底部(2a1a)と凸部(2a2)の頂部(2a2a)とが形成されている。   In the illuminating device (10) according to claim 5, by forming a plurality of substantially frustoconical holes (2a ') in the incident surface (2a) of the convex lens (2), a plurality of concave portions (2a1) and a plurality of concave portions (2a1) are formed. The convex portion (2a2) is formed on the incident surface (2a) of the convex lens (2). Furthermore, the bottom (2a1a) of the recess (2a1) and the top (2a2a) of the projection (2a2) are formed by rotating a plurality of arcs around the central axis of the frustoconical hole (2a ′). ing.

つまり、請求項5に記載の照明装置(10)では、複数のクレーター状の凹部(2a1)が凸レンズ(2)の入射面(2a)に形成されている。詳細には、請求項5に記載の照明装置(10)では、白色LED(1)からの光の一部が、凸レンズ(2)の入射面(2a)の凹部(2a1)の底部(2a1a)および凸部(2a2)の頂部(2a2a)に対してほぼ垂直に入射されると共に、白色LED(1)からの光の一部が、凸レンズ(2)の入射面(2a)の凹部(2a1)および凸部(2a2)の側壁(2a3)で大きく屈折し、凸レンズ(2)に入射される。   That is, in the illuminating device (10) according to claim 5, a plurality of crater-shaped recesses (2a1) are formed on the incident surface (2a) of the convex lens (2). Specifically, in the illumination device (10) according to claim 5, a part of the light from the white LED (1) is transmitted from the bottom (2a1a) of the recess (2a1) of the incident surface (2a) of the convex lens (2). And a portion of the light from the white LED (1) is incident on the top surface (2a2a) of the convex portion (2a2) and a concave portion (2a1) of the incident surface (2a) of the convex lens (2). The light is refracted greatly at the side wall (2a3) of the convex portion (2a2) and is incident on the convex lens (2).

その結果、請求項5に記載の照明装置(10)では、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度よりも高い配光特性が形成される。   As a result, in the illumination device (10) according to claim 5, the luminous intensity of the light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illumination device is the main light of the illumination device. A light distribution characteristic higher than the luminous intensity of the light irradiated from the convex lens (2) in the axis (CL) direction is formed.

換言すれば、請求項5に記載の照明装置(10)によれば、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度よりも高い配光特性を形成することができる。   In other words, according to the illuminating device (10) of claim 5, the luminous intensity of the light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illuminating device is It is possible to form a light distribution characteristic higher than the luminous intensity of the light irradiated from the convex lens (2) in the main optical axis (CL) direction.

請求項6に記載の看板照明装置(20)では、請求項2〜5のいずれか一項に記載の照明装置(10)が複数設けられている。つまり、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度よりも高い配光特性を有する照明装置(10)が複数設けられている。   In the signboard illumination device (20) according to claim 6, a plurality of illumination devices (10) according to any one of claims 2 to 5 are provided. That is, the luminous intensity of light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illumination device is emitted from the convex lens (2) in the direction of the main optical axis (CL) of the illumination device. A plurality of illumination devices (10) having a light distribution characteristic higher than the luminous intensity of light are provided.

また、請求項6に記載の看板照明装置(20)では、複数の照明装置(10)が照明装置の主光軸線(CL)に直交する方向に間隔Aを隔てて配列されている。   Further, in the signboard lighting device (20) according to the sixth aspect, the plurality of lighting devices (10) are arranged at intervals A in a direction orthogonal to the main optical axis (CL) of the lighting device.

そのため、請求項6に記載の看板照明装置(20)によれば、照明装置の主光軸線方向に凸レンズから照射される光の光度が、照明装置の主光軸線と約50°をなして凸レンズから照射される光の光度よりも高い配光特性を有する複数の照明装置が、照明装置の主光軸線に直交する方向に間隔Aを隔てて配列されている看板照明装置よりも、隣接する2個の照明装置(10)の中間の部分を明るくすることができる。   Therefore, according to the signboard illuminating device (20) according to claim 6, the luminous intensity of light irradiated from the convex lens in the main optical axis direction of the illuminating device forms approximately 50 ° with the main optical axis line of the illuminating device, and the convex lens. A plurality of lighting devices having a light distribution characteristic higher than the luminous intensity of light emitted from the lighting device 2 are adjacent to each other than the signboard lighting devices arranged at intervals A in the direction orthogonal to the main optical axis of the lighting device. The middle part of the individual lighting devices (10) can be brightened.

更に、請求項6に記載の看板照明装置(20)では、照明装置(10)の凸レンズ(2)からの照射光によって照射される看板(21)が、間隔Aの約2分の1の距離Bだけ照明装置(10)から照明装置の主光軸線(CL)方向に離間せしめられて配置されている。   Furthermore, in the signboard illuminating device (20) according to claim 6, the signboard (21) irradiated by the irradiation light from the convex lens (2) of the illuminating device (10) is a distance of about a half of the interval A. Only B is arranged so as to be separated from the illumination device (10) in the main optical axis (CL) direction of the illumination device.

つまり、請求項6に記載の看板照明装置(20)では、看板(21)が照明装置(10)から近い位置に配置されている。   That is, in the signboard illumination device (20) according to claim 6, the signboard (21) is arranged at a position close to the illumination device (10).

そのため、請求項6に記載の看板照明装置(20)によれば、照明装置の主光軸線(CL)方向寸法を小型化しつつ、隣接する2個の照明装置(10)の中間の部分が暗くなってしまうのを回避することができる。   Therefore, according to the signboard illuminating device (20) of the sixth aspect, the intermediate portion between the two adjacent illuminating devices (10) is dark while reducing the size of the illuminating device in the main optical axis (CL) direction. It can be avoided.

請求項7に記載の直下型液晶パネル用バックライト装置(30)では、請求項2〜5のいずれか一項に記載の照明装置(10)が複数設けられている。つまり、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度よりも高い配光特性を有する照明装置(10)が複数設けられている。   In the backlight device (30) for a direct type liquid crystal panel according to claim 7, a plurality of illumination devices (10) according to any one of claims 2 to 5 are provided. That is, the luminous intensity of light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illumination device is emitted from the convex lens (2) in the direction of the main optical axis (CL) of the illumination device. A plurality of illumination devices (10) having a light distribution characteristic higher than the luminous intensity of light are provided.

また、請求項7に記載の直下型液晶パネル用バックライト装置(30)では、複数の照明装置(10)が照明装置の主光軸線(CL)に直交する方向に間隔Cを隔てて配列されている。   In the backlight device (30) for a direct type liquid crystal panel according to claim 7, the plurality of lighting devices (10) are arranged at intervals C in a direction orthogonal to the main optical axis (CL) of the lighting device. ing.

そのため、請求項7に記載の直下型液晶パネル用バックライト装置(30)によれば、照明装置の主光軸線方向に凸レンズから照射される光の光度が、照明装置の主光軸線と約50°をなして凸レンズから照射される光の光度よりも高い配光特性を有する複数の照明装置が、照明装置の主光軸線に直交する方向に間隔Cを隔てて配列されている直下型液晶パネル用バックライト装置よりも、隣接する2個の照明装置(10)の中間の部分を明るくすることができる。   Therefore, according to the backlight device (30) for a direct type liquid crystal panel according to claim 7, the luminous intensity of light irradiated from the convex lens in the main optical axis direction of the illuminating device is about 50 times that of the main optical axis line of the illuminating device. A direct-type liquid crystal panel in which a plurality of illumination devices having a light distribution characteristic higher than the intensity of light emitted from a convex lens at an angle is arranged at intervals C in a direction perpendicular to the main optical axis of the illumination device It is possible to brighten the intermediate portion between two adjacent illumination devices (10) than the conventional backlight device.

更に、請求項7に記載の直下型液晶パネル用バックライト装置(30)では、照明装置(10)の凸レンズ(2)からの照射光によって照射される液晶パネル(31)が、間隔Cの約2分の1の距離Dだけ照明装置(10)から照明装置の主光軸線(CL)方向に離間せしめられて配置されている。   Furthermore, in the backlight device (30) for a direct type liquid crystal panel according to claim 7, the liquid crystal panel (31) irradiated by the irradiation light from the convex lens (2) of the illuminating device (10) has an interval C. The illumination device (10) is spaced apart from the illumination device (10) in the direction of the main optical axis (CL) by a half distance D.

つまり、請求項7に記載の直下型液晶パネル用バックライト装置(30)では、液晶パネル(31)が照明装置(10)から近い位置に配置されている。   That is, in the backlight device (30) for a direct type liquid crystal panel according to claim 7, the liquid crystal panel (31) is disposed at a position close to the illumination device (10).

そのため、請求項7に記載の直下型液晶パネル用バックライト装置(30)によれば、照明装置の主光軸線(CL)方向寸法を小型化しつつ、隣接する2個の照明装置(10)の中間の部分が暗くなってしまうのを回避することができる。   Therefore, according to the backlight device (30) for a direct type liquid crystal panel according to claim 7, the size of the illuminating device in the main optical axis (CL) direction is reduced, and the two illuminating devices (10) adjacent to each other are reduced. It can be avoided that the middle part becomes dark.

以下、本発明の照明装置の第1の実施形態について説明する。図1は第1の実施形態の照明装置10を示した図である。詳細には、図1(A)は照明装置の主光軸線CLを含む平面によって切断された第1の実施形態の照明装置10の断面図、図1(B)は照明装置の主光軸線CLを含む平面によって切断された凸レンズ2の断面図、図1(C)は凸レンズ2の底面図(図1(B)の下側から見た図)である。図2は図1(A)に示した凸レンズ2の入射面2aの拡大断面図、図3は図1(A)に示した断面内における光路を示した図である。   Hereinafter, a first embodiment of the illumination device of the present invention will be described. FIG. 1 is a diagram illustrating a lighting device 10 according to the first embodiment. Specifically, FIG. 1A is a cross-sectional view of the illumination apparatus 10 of the first embodiment cut by a plane including the main optical axis line CL of the illumination apparatus, and FIG. 1B is a main optical axis line CL of the illumination apparatus. FIG. 1C is a bottom view of the convex lens 2 (a view seen from the lower side of FIG. 1B). 2 is an enlarged cross-sectional view of the incident surface 2a of the convex lens 2 shown in FIG. 1A, and FIG. 3 is a view showing an optical path in the cross section shown in FIG.

第1の実施形態の照明装置10では、図1(A)に示すように、青色系の光を発光する発光素子1aが、概略すり鉢状のリフレクタ1bによって取り囲まれている。また、リフレクタ1bによって取り囲まれる空間に、発光素子1aからの青色系の光によって励起されて黄色系の蛍光を発する蛍光体を含有する光透過性封止部材1cが、充填されている。更に、発光素子1aからの青色系の光と蛍光体からの黄色系の蛍光とが混ざった白色光を放射するように、白色LED1が構成されている。また、白色LED1が、例えばアルミニウムなどのような高熱伝導性材料によって形成された基板3に搭載されている。   In the illuminating device 10 of 1st Embodiment, as shown to FIG. 1 (A), the light emitting element 1a which light-emits blue light is surrounded by the substantially mortar-shaped reflector 1b. In addition, a space surrounded by the reflector 1b is filled with a light-transmitting sealing member 1c containing a phosphor that emits yellow fluorescence when excited by blue light from the light emitting element 1a. Further, the white LED 1 is configured to emit white light in which blue light from the light emitting element 1a and yellow fluorescent light from the phosphor are mixed. Also, the white LED 1 is mounted on a substrate 3 formed of a high thermal conductivity material such as aluminum.

更に、第1の実施形態の照明装置10では、図1(A)に示すように、白色LED1からの光を配光制御するために、例えば樹脂材料の成形によって形成された凸レンズ2が設けられている。また、白色LED1からの光が入射される入射面2aが、凸レンズ2の表面のうち、白色LED1の光透過性封止部材1cに対向する位置に形成されている。   Furthermore, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 1 (A), in order to carry out light distribution control of the light from white LED1, the convex lens 2 formed, for example by shaping | molding of the resin material is provided. ing. In addition, an incident surface 2 a on which light from the white LED 1 is incident is formed at a position facing the light-transmitting sealing member 1 c of the white LED 1 on the surface of the convex lens 2.

また、第1の実施形態の照明装置10では、図1および図2に示すように、凸レンズ2の入射面2aが、例えば3個の凹部2a1と例えば2個の凸部2a2とを有する凹凸形状に形成されている。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown in FIG. 1 and FIG. 2, the entrance surface 2a of the convex lens 2 is uneven | corrugated shape which has the three recessed parts 2a1 and the two convex parts 2a2, for example. Is formed.

詳細には、第1の実施形態の照明装置10では、図1および図2に示すように、照明装置の主光軸線CLを中心に照明装置の主光軸線CLと約10〜20°をなす例えば4本の線分A1,A2,A3,A4(図2参照)を回転させることにより、凹部2a1および凸部2a2の4個の側壁2a3が形成されている。   In detail, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 1 and FIG. 2, it makes about 10-20 degrees with the main optical axis line CL of an illuminating device centering on the main optical axis line CL of an illuminating device. For example, by rotating four line segments A1, A2, A3, A4 (see FIG. 2), four side walls 2a3 of the concave portion 2a1 and the convex portion 2a2 are formed.

更に、第1の実施形態の照明装置10では、図1および図2に示すように、隣接する2個の環状の凸部2a2のピッチP(図2参照)の約5分の1の大きさの半径R1,R2(図2参照)を有する例えば5個の円弧を、照明装置の主光軸線CLを中心に回転させることにより、凹部2a1の底部2a1aと凸部2a2の頂部2a2aとが形成されている。詳細には、第1の実施形態の照明装置10では、ピッチPが例えば約1mmに設定され、半径R1,R2が例えば約0.2mmに設定され、凹部2a1の深さDが例えば約0.7mmに設定されている。   Furthermore, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 1 and FIG. 2, the magnitude | size of about 1/5 of the pitch P (refer FIG. 2) of two adjacent cyclic | annular convex parts 2a2. For example, five arcs having radii R1 and R2 (see FIG. 2) are rotated around the main optical axis CL of the illumination device, thereby forming the bottom 2a1a of the recess 2a1 and the top 2a2a of the projection 2a2. ing. Specifically, in the illumination device 10 of the first embodiment, the pitch P is set to about 1 mm, the radii R1 and R2 are set to about 0.2 mm, for example, and the depth D of the recess 2a1 is about 0. It is set to 7 mm.

つまり、第1の実施形態の照明装置10では、図1(C)に示すように、照明装置の主光軸線CLを中心とする環状の凹部2a1と環状の凸部2a2とが、凸レンズ2の入射面2aに同心円状に形成されている。   That is, in the illuminating device 10 of the first embodiment, as shown in FIG. 1C, the annular concave portion 2 a 1 and the annular convex portion 2 a 2 centering on the main optical axis CL of the illuminating device are formed of the convex lens 2. It is formed concentrically on the incident surface 2a.

更に、第1の実施形態の照明装置10では、図1(A)および図1(B)に示すように、凸レンズ2の入射面2aの凹部2a1の底部2a1aが、照明装置の主光軸線CL上に配置されている。また、凸レンズ2の出射面2bに凸状面部2b1と平面部2b2とが形成されている。更に、凸レンズ2の出射面2bの平面部2b2が、照明装置の主光軸線CL上に配置されている。   Furthermore, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 1 (A) and FIG. 1 (B), the bottom part 2a1a of the recessed part 2a1 of the entrance plane 2a of the convex lens 2 is the main optical axis line CL of the illuminating device. Is placed on top. A convex surface portion 2b1 and a flat surface portion 2b2 are formed on the exit surface 2b of the convex lens 2. Furthermore, the plane part 2b2 of the exit surface 2b of the convex lens 2 is disposed on the main optical axis CL of the illumination device.

詳細には、第1の実施形態の照明装置10では、図3(A)に示すように、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L1が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと大きい角度θ1をなして凸レンズ2から照明装置の照射方向(図3(A)の上側)に照射される。また、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L2が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと大きい角度θ2をなして凸レンズ2から照明装置の照射方向(図3(A)の上側)に照射される。   In detail, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 3 (A), from the central part 1c1 vicinity of the light-transmitting sealing member 1c with the low ratio converted into yellowish by a fluorescent substance. The light L1 is refracted at the side wall 2a3 (see FIG. 2) of the entrance surface 2a of the convex lens 2 and the convex surface portion 2b1 of the exit surface 2b, and illuminates from the convex lens 2 at a large angle θ1 with the main optical axis CL of the illumination device. Irradiation is performed in the irradiation direction of the apparatus (upper side in FIG. 3A). Further, the light L2 from the vicinity of the central portion 1c1 of the light-transmitting sealing member 1c that is converted into a yellowish color by the phosphor is the side wall 2a3 (see FIG. 2) of the entrance surface 2a of the convex lens 2 and the exit surface 2b. Is refracted at the convex surface portion 2b1, and is irradiated from the convex lens 2 in the irradiation direction of the illumination device (upper side in FIG. 3A) at a large angle θ2 with the main optical axis CL of the illumination device.

更に、第1の実施形態の照明装置10では、図3(B)に示すように、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L3が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと大きい角度θ3をなして凸レンズ2から照明装置の照射方向(図3(B)の上側)に照射される。また、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L4が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと大きい角度θ4をなして凸レンズ2から照明装置の照射方向(図3(B)の上側)に照射される。   Furthermore, in the illumination device 10 according to the first embodiment, as shown in FIG. 3B, light from the vicinity of the central portion 1c1 of the light-transmitting sealing member 1c that has a low ratio of being converted to yellow by the phosphor. L3 is refracted at the side wall 2a3 (see FIG. 2) of the entrance surface 2a of the convex lens 2 and the convex surface portion 2b1 of the exit surface 2b, and forms a large angle θ3 with the main optical axis CL of the illumination device from the convex lens 2 to the illumination device. Irradiation is in the irradiation direction (upper side in FIG. 3B). Further, the light L4 from the vicinity of the central portion 1c1 of the light-transmitting sealing member 1c, which is converted into a yellow color by the phosphor, is emitted from the side wall 2a3 (see FIG. 2) of the incident surface 2a of the convex lens 2 and the emission surface 2b. Is refracted at the convex surface portion 2b1 and is irradiated in the irradiation direction of the illumination device (upper side in FIG. 3B) from the convex lens 2 at a large angle θ4 with the main optical axis CL of the illumination device.

一方、第1の実施形態の照明装置10では、図3(C)に示すように、蛍光体によって黄色系に変換される割合が高い光透過性封止部材1cの外周部1c2付近からの光L5が、凸レンズ2の入射面2aの凹部2a1(図2参照)の底部2a1a(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと小さい角度θ5をなして凸レンズ2から照射される。   On the other hand, in the illuminating device 10 of 1st Embodiment, as shown to FIG.3 (C), the light from the outer peripheral part 1c2 vicinity of the light-transmissive sealing member 1c with a high ratio converted into yellowish by a fluorescent substance is shown. L5 is refracted at the bottom 2a1a (see FIG. 2) of the recess 2a1 (see FIG. 2) of the entrance surface 2a of the convex lens 2 and the convex surface 2b1 of the exit surface 2b, and has a small angle θ5 with the main optical axis CL of the illumination device. The light is irradiated from the convex lens 2.

換言すれば、第1の実施形態の照明装置10では、図3に示すように、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L1,L2,L3,L4が、照明装置の主光軸線CLと大きい角度θ1,θ2,θ3,θ4をなして凸レンズ2から照射され、かつ、蛍光体によって黄色系に変換される割合が高い光透過性封止部材1cの外周部1c2付近からの光L5が、照明装置の主光軸線CLと小さい角度θ5(<θ1,θ2,θ3,θ4)をなして凸レンズ2から照射されるように、凸レンズ2の入射面2aが、複数の凹部2a1と複数の凸部2a2とを有する凹凸形状に形成されている。   In other words, in the illuminating device 10 of 1st Embodiment, as shown in FIG. 3, the light L1 from the center part 1c1 vicinity of the light-transmissive sealing member 1c with a low ratio converted into yellowish by a fluorescent substance is shown. , L2, L3, and L4 are irradiated from the convex lens 2 at large angles θ1, θ2, θ3, and θ4 with respect to the main optical axis CL of the lighting device, and light is transmitted at a high rate of being converted to yellow by the phosphor. Convex lens 2 so that light L5 from the periphery 1c2 of the sealing member 1c is irradiated from the convex lens 2 at a small angle θ5 (<θ1, θ2, θ3, θ4) with the main optical axis CL of the illumination device. The two incident surfaces 2a are formed in a concavo-convex shape having a plurality of concave portions 2a1 and a plurality of convex portions 2a2.

つまり、特開2005−216782号公報の図1、図5、図8に記載された照明装置のように、蛍光体によって黄色系に変換される割合が高い光透過性封止部材の外周部付近からの光が、凸レンズの入射面から凸レンズの径方向にかなり離れた位置に配置されている周辺反射面により、蛍光体によって黄色系に変換される割合が低い光透過性封止部材の中央部付近からの光の照射エリアの中心付近に指向せしめられるのではなく、第1の実施形態の照明装置10では、図3に示すように、蛍光体によって黄色系に変換される割合が高い光透過性封止部材1cの外周部1c2付近からの光L5が、白色LED1の光透過性封止部材1cに対向する位置に配置されている凸レンズ2の入射面2aにより、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L1,L2,L3,L4の照射エリアの中心付近に指向せしめられる。   That is, in the vicinity of the outer peripheral portion of the light-transmitting sealing member that has a high ratio of being converted to a yellow color by the phosphor as in the lighting device described in FIG. 1, FIG. 5, and FIG. The central portion of the light-transmitting sealing member that has a low rate of being converted to yellow by the phosphor by the peripheral reflection surface arranged at a position that is considerably away from the incident surface of the convex lens in the radial direction of the convex lens Rather than being directed to the vicinity of the center of the irradiation area of light from the vicinity, in the illumination device 10 of the first embodiment, as shown in FIG. The light L5 from the vicinity of the outer peripheral portion 1c2 of the conductive sealing member 1c is converted into a yellow color by the phosphor by the incident surface 2a of the convex lens 2 disposed at a position facing the light-transmissive sealing member 1c of the white LED 1 Percentage Less light transmissive sealing member 1c light L1 from the vicinity of the center portion 1c1 of, L2, L3, caused to directed to L4 near the center of the irradiation area.

そのため、第1の実施形態の照明装置10によれば、特開2005−216782号公報の図1、図5、図8に記載された照明装置よりも凸レンズ2を小型化しつつ、凸レンズ2からの照射光の照射エリアの外周部付近に黄色の色ムラが形成されてしまうのを回避することができる。   Therefore, according to the illuminating device 10 of the first embodiment, the convex lens 2 from the convex lens 2 can be reduced in size as compared with the illuminating device described in FIGS. 1, 5, and 8 of JP-A-2005-216682. It is possible to prevent yellow color unevenness from being formed near the outer periphery of the irradiation light irradiation area.

図4は第1の実施形態の照明装置10の配光特性を示した図である。図4において、破線PT1は白色LED1の配光特性を示している。つまり、破線PT1は、白色LED1から放射される光の光度と、白色LED1から放射される光が照明装置の主光軸線CL(図3参照)となす角度との関係を示している。更に、実線PT2は凸レンズ2の出射面2bから照射される光の配光特性を示している。つまり、実線PT2は、凸レンズ2の出射面2bから照射される光の光度と、凸レンズ2の出射面2bから照射される光が照明装置の主光軸線CL(図3参照)となす角度との関係を示している。   FIG. 4 is a diagram illustrating the light distribution characteristics of the illumination device 10 according to the first embodiment. In FIG. 4, the broken line PT1 indicates the light distribution characteristic of the white LED 1. That is, the broken line PT1 indicates the relationship between the luminous intensity of the light emitted from the white LED 1 and the angle formed by the light emitted from the white LED 1 and the main optical axis CL (see FIG. 3) of the illumination device. Further, a solid line PT2 indicates the light distribution characteristic of the light irradiated from the exit surface 2b of the convex lens 2. That is, the solid line PT2 is the luminous intensity of light emitted from the exit surface 2b of the convex lens 2 and the angle formed by the light emitted from the exit surface 2b of the convex lens 2 with the main optical axis CL (see FIG. 3) of the illumination device. Showing the relationship.

第1の実施形態の照明装置10では、図4に破線PT1で示すように、白色LED1から照明装置の主光軸線CL方向に放射される光の光度(100%)が最も高くなっている。また、照明装置の主光軸線CLとなす角度が大きくなるに従って、白色LED1から放射される光の光度が低くなっている。詳細には、照明装置の主光軸線CLと約60°をなして白色LED1から放射される光の光度(50%)が、白色LED1から照明装置の主光軸線CL方向に放射される光の光度(100%)の約50%に設定されている。   In the illumination device 10 of the first embodiment, as indicated by a broken line PT1 in FIG. 4, the luminous intensity (100%) of light emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device is the highest. Moreover, the luminous intensity of the light radiated | emitted from white LED1 is low as the angle made with the main optical axis line CL of an illuminating device becomes large. Specifically, the luminous intensity (50%) of light emitted from the white LED 1 at about 60 ° with the main optical axis CL of the lighting device is the light intensity emitted from the white LED 1 in the direction of the main optical axis CL of the lighting device. It is set to about 50% of luminous intensity (100%).

更に、第1の実施形態の照明装置10では、図4に実線PT2で示すように、照明装置の主光軸線CLと約50°をなして凸レンズ2の出射面2bから照射される光の光度(100%)が最も高くなっている。照明装置の主光軸線CLとなす角度が約50°より小さくなるに従って凸レンズ2の出射面2bから照射される光の光度が低くなり、照明装置の主光軸線CLとなす角度が約50°より大きくなるに従って凸レンズ2の出射面2bから照射される光の光度が低くなっている。詳細には、照明装置の主光軸線CLと約65°をなして凸レンズ2の出射面2bから照射される光の光度(50%)が、照明装置の主光軸線CLと約50°をなして凸レンズ2の出射面2bから照射される光の光度(100%)の約50%に設定されている。更に、凸レンズ2の出射面2bから照明装置の主光軸線CL方向に照射される光の光度(約75%)が、照明装置の主光軸線CLと約50°をなして凸レンズ2の出射面2bから照射される光の光度(100%)の約75%に設定されている。   Furthermore, in the illuminating device 10 of the first embodiment, as indicated by a solid line PT2 in FIG. 4, the luminous intensity of light emitted from the exit surface 2b of the convex lens 2 at about 50 ° with the main optical axis CL of the illuminating device. (100%) is the highest. As the angle formed with the main optical axis CL of the illuminating device becomes smaller than about 50 °, the luminous intensity of light irradiated from the exit surface 2b of the convex lens 2 becomes lower, and the angle formed with the main optical axis CL of the illuminating device becomes smaller than about 50 °. As it increases, the luminous intensity of light emitted from the exit surface 2b of the convex lens 2 decreases. Specifically, the luminous intensity (50%) of light emitted from the exit surface 2b of the convex lens 2 at about 65 ° with the main optical axis CL of the lighting device forms about 50 ° with the main optical axis CL of the lighting device. Thus, the luminous intensity is set to about 50% of the light intensity (100%) of light emitted from the exit surface 2b of the convex lens 2. Furthermore, the luminous intensity (about 75%) of light irradiated from the exit surface 2b of the convex lens 2 in the direction of the main optical axis CL of the illumination device forms about 50 ° with the main optical axis CL of the illumination device, and the exit surface of the convex lens 2 It is set to about 75% of the luminous intensity (100%) of light emitted from 2b.

第1の実施形態の照明装置10では、図3(A)および図4に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L1が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約42°の角度θ1をなして凸レンズ2の出射面2bから照射される。   In the illuminating device 10 of the first embodiment, as shown in FIGS. 3A and 4, the strong light L <b> 1 emitted from the white LED 1 in the direction of the main optical axis CL of the illuminating device is incident on the incident surface 2 a of the convex lens 2. 2 is refracted at the side wall 2a3 (see FIG. 2) and the convex surface portion 2b1 of the emission surface 2b, and is irradiated from the emission surface 2b of the convex lens 2 at an angle θ1 of about 42 ° with the main optical axis CL of the illumination device.

また、第1の実施形態の照明装置10では、図3(A)および図4に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L2が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約47°の角度θ2をなして凸レンズ2の出射面2bから照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 3 (A) and FIG. 4, the strong light L2 radiated | emitted from the white LED 1 to the main optical axis line CL direction of the illuminating device is incident on the convex lens 2. The light is refracted at the side wall 2a3 (see FIG. 2) of the surface 2a and the convex surface portion 2b1 of the output surface 2b, and is irradiated from the output surface 2b of the convex lens 2 at an angle θ2 of about 47 ° with the main optical axis CL of the illumination device. .

更に、第1の実施形態の照明装置10では、図3(B)および図4に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L3が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約37°の角度θ3をなして凸レンズ2の出射面2bから照射される。   Furthermore, in the illumination device 10 of the first embodiment, as shown in FIGS. 3B and 4, the strong light L3 emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device is incident on the convex lens 2. The light is refracted at the side wall 2a3 (see FIG. 2) of the surface 2a and the convex surface portion 2b1 of the output surface 2b, and is irradiated from the output surface 2b of the convex lens 2 at an angle θ3 of about 37 ° with the main optical axis CL of the illumination device. .

また、第1の実施形態の照明装置10では、図3(B)および図4に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L4が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約55°の角度θ4をなして凸レンズ2の出射面2bから照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 3 (B) and FIG. 4, the strong light L4 radiated | emitted in the main optical axis line CL direction of the illuminating device from white LED1 is incident on the convex lens 2. The light is refracted at the side wall 2a3 (see FIG. 2) of the surface 2a and the convex surface portion 2b1 of the output surface 2b, and is irradiated from the output surface 2b of the convex lens 2 at an angle θ4 of about 55 ° with the main optical axis CL of the illumination device. .

つまり、第1の実施形態の照明装置10では、図3(A)、図3(B)および図4に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L1,L2,L3,L4が、照明装置の主光軸線CLと約50°をなして凸レンズ2の出射面2bから照射される。その結果、図4に実線PT2で示すように、照明装置の主光軸線CLと50°をなして凸レンズ2の出射面2bから照射される光の光度(100%)が最も高くなっている。   That is, in the illumination device 10 of the first embodiment, as shown in FIGS. 3A, 3B, and 4, strong light L1 emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device. , L2, L3, and L4 are irradiated from the exit surface 2b of the convex lens 2 at about 50 ° with the main optical axis CL of the illumination device. As a result, as indicated by a solid line PT2 in FIG. 4, the luminous intensity (100%) of light emitted from the exit surface 2b of the convex lens 2 at 50 ° with the main optical axis CL of the illumination device is the highest.

図5〜図7は図1(A)に示した断面内における光路を示した図である。   5 to 7 are views showing optical paths in the cross section shown in FIG.

第1の実施形態の照明装置10では、図4および図5(A)に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L6が、凸レンズ2の入射面2aの凹部2a1(図2参照)の底部2a1a(図2参照)に対してほぼ垂直に入射され、凸レンズ2の出射面2bの平面部2b2に対してほぼ垂直に出射され、照明装置の主光軸線CL方向に照射される。   In the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 5A, strong light L6 emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device is incident on the incident surface 2a of the convex lens 2. Is incident substantially perpendicularly to the bottom 2a1a (see FIG. 2) of the concave portion 2a1 (see FIG. 2), and is emitted substantially perpendicularly to the flat portion 2b2 of the exit surface 2b of the convex lens 2, and is the main optical axis of the illumination device Irradiated in the CL direction.

更に、第1の実施形態の照明装置10では、図4および図5(A)に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L7が、凸レンズ2の入射面2aの凸部2a2(図2参照)の頂部2a2a(図2参照)に対してほぼ垂直に入射され、凸レンズ2の出射面2bの平面部2b2に対してほぼ垂直に出射され、照明装置の主光軸線CL方向に照射される。   Furthermore, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 5A, strong light L7 emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device is incident on the convex lens 2. The light is incident substantially perpendicular to the top 2a2a (see FIG. 2) of the convex portion 2a2 (see FIG. 2) of the surface 2a, and is emitted substantially perpendicular to the flat portion 2b2 of the emission surface 2b of the convex lens 2. Irradiated in the direction of the main optical axis CL.

また、第1の実施形態の照明装置10では、図4および図5(C)に示すように、照明装置の主光軸線CLと約18°をなして白色LED1から放射された強い光L10が、凸レンズ2の入射面2aの凹部2a1(図2参照)の底部2a1a(図2参照)において屈折し、凸レンズ2の出射面2bの平面部2b2に対してほぼ垂直に出射され、照明装置の主光軸線CL方向に照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown in FIG.4 and FIG.5 (C), the strong light L10 radiated | emitted from white LED 1 made | formed about 18 degrees with the main optical axis CL of the illuminating device. The light is refracted at the bottom 2a1a (see FIG. 2) of the concave portion 2a1 (see FIG. 2) of the incident surface 2a of the convex lens 2, and is emitted substantially perpendicularly to the flat surface 2b2 of the emission surface 2b of the convex lens 2. Irradiated in the direction of the optical axis CL.

つまり、第1の実施形態の照明装置10では、図4、図5(A)および図5(C)に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L6,L7,L10が、凸レンズ2の出射面2bから照明装置の主光軸線CL方向に照射される。その結果、図4に実線PT2で示すように、照明装置の主光軸線CL方向に凸レンズ2の出射面2bから照射される光の光度(約75%)が、照明装置の主光軸線CLと約50°をなして凸レンズ2の出射面2bから照射される光の光度(100%)の約75%になっている。   That is, in the illumination device 10 of the first embodiment, as shown in FIGS. 4, 5A, and 5C, the strong light L6 emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device. , L7, and L10 are irradiated from the exit surface 2b of the convex lens 2 in the direction of the main optical axis CL of the illumination device. As a result, as indicated by a solid line PT2 in FIG. 4, the luminous intensity (about 75%) of light emitted from the exit surface 2b of the convex lens 2 in the direction of the main optical axis CL of the illumination device is the same as the main optical axis CL of the illumination device. It is about 75% of the luminous intensity (100%) of the light irradiated from the exit surface 2b of the convex lens 2 at about 50 °.

更に、第1の実施形態の照明装置10では、図4および図5(B)に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L8が、凸レンズ2の入射面2aの凸部2a2(図2参照)の頂部2a2a(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約27°の角度θ8をなして凸レンズ2の出射面2bから照射される。   Furthermore, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 5B, strong light L8 emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device is incident on the convex lens 2. A convex lens that refracts at the top 2a2a (see FIG. 2) of the convex portion 2a2 (see FIG. 2) of the surface 2a and the convex surface portion 2b1 of the exit surface 2b and forms an angle θ8 of about 27 ° with the main optical axis CL of the illumination device. 2 is emitted from the exit surface 2b.

また、第1の実施形態の照明装置10では、図4および図5(B)に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L9が、凸レンズ2の入射面2aの凹部2a1(図2参照)の底部2a1a(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約24°の角度θ9をなして凸レンズ2の出射面2bから照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 4 and FIG. 5 (B), the strong light L9 radiated | emitted from the white LED 1 to the main optical axis line CL direction of the illuminating device is incident on the convex lens 2. The convex lens 2 is refracted at the bottom 2a1a (see FIG. 2) of the recess 2a1 (see FIG. 2) of the surface 2a and the convex surface 2b1 of the exit surface 2b, and forms an angle θ9 of about 24 ° with the main optical axis CL of the illumination device. It irradiates from the output surface 2b.

つまり、第1の実施形態の照明装置10では、図4および図5(B)に示すように、白色LED1から照明装置の主光軸線CL方向に放射された強い光L8,L9が、照明装置の主光軸線CLと約25°をなして凸レンズ2の出射面2bから照射される。その結果、図4に実線PT2で示すように、照明装置の主光軸線CLと約25°をなして凸レンズ2の出射面2bから照射される光の光度(約80%)が、照明装置の主光軸線CLと約50°をなして凸レンズ2の出射面2bから照射される光の光度(100%)の約80%になっている。   That is, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 5B, strong light L8 and L9 emitted from the white LED 1 in the direction of the main optical axis CL of the illumination device is converted into the illumination device. Is irradiated from the exit surface 2b of the convex lens 2 at about 25 ° with the main optical axis CL. As a result, as indicated by a solid line PT2 in FIG. 4, the luminous intensity (about 80%) of the light irradiated from the exit surface 2b of the convex lens 2 at about 25 ° with the main optical axis CL of the lighting device is It is about 80% of the luminous intensity (100%) of light irradiated from the exit surface 2b of the convex lens 2 at about 50 ° with the main optical axis CL.

更に、第1の実施形態の照明装置10では、図4および図6(A)に示すように、照明装置の主光軸線CLと約15°をなして白色LED1から放射された強い光L11が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約48°の角度θ11をなして凸レンズ2の出射面2bから照射される。   Furthermore, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 4 and FIG. 6 (A), the strong light L11 radiated | emitted from white LED 1 made | formed about 15 degrees with the main optical axis CL of the illuminating device. Refracted at the side wall 2a3 (see FIG. 2) of the entrance surface 2a of the convex lens 2 and the convex surface portion 2b1 of the exit surface 2b, and forms an exit surface of the convex lens 2 at an angle θ11 of about 48 ° with the main optical axis CL of the illumination device. Irradiated from 2b.

また、第1の実施形態の照明装置10では、図4および図6(A)に示すように、照明装置の主光軸線CLと約35°をなして白色LED1から放射された強い光L12が、凸レンズ2の入射面2aの側壁2a3(図2参照)および出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約58°の角度θ12をなして凸レンズ2の出射面2bから照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 4 and FIG. 6 (A), the strong light L12 radiated | emitted from white LED 1 made | formed about 35 degrees with the main optical axis CL of the illuminating device. Refracting at the side wall 2a3 (see FIG. 2) of the entrance surface 2a of the convex lens 2 and the convex surface portion 2b1 of the exit surface 2b, and forming the exit surface of the convex lens 2 at an angle θ12 of about 58 ° with the main optical axis CL of the illumination device. Irradiated from 2b.

つまり、第1の実施形態の照明装置10では、図4および図6(A)に示すように、照明装置の主光軸線CLと小さい角度をなして白色LED1から放射された強い光L11,L12が、照明装置の主光軸線CLと約50°をなして凸レンズ2の出射面2bから照射される。その結果、図4に実線PT2で示すように、照明装置の主光軸線CLと50°をなして凸レンズ2の出射面2bから照射される光の光度(100%)が最も高くなっている。   That is, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 6A, strong lights L11 and L12 emitted from the white LED 1 at a small angle with the main optical axis CL of the illumination device. Is emitted from the exit surface 2b of the convex lens 2 at about 50 ° with the main optical axis CL of the illumination device. As a result, as indicated by a solid line PT2 in FIG. 4, the luminous intensity (100%) of light emitted from the exit surface 2b of the convex lens 2 at 50 ° with the main optical axis CL of the illumination device is the highest.

更に、第1の実施形態の照明装置10では、図4および図6(B)に示すように、照明装置の主光軸線CLと約40°をなして白色LED1から放射されたやや弱い光L13が、凸レンズ2の入射面2aの凸部2a2(図2参照)の頂部2a2a(図2参照)において屈折し、次いで、側壁2a3(図2参照)によって反射され、次いで、出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約34°の角度θ13をなして凸レンズ2の出射面2bから照射される。   Furthermore, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 6B, the slightly weak light L13 emitted from the white LED 1 at about 40 ° with the main optical axis CL of the illumination device. Is refracted at the top 2a2a (see FIG. 2) of the convex portion 2a2 (see FIG. 2) of the incident surface 2a of the convex lens 2, and then reflected by the side wall 2a3 (see FIG. 2), and then the convex shape of the exit surface 2b. The light is refracted at the surface portion 2b1 and irradiated from the exit surface 2b of the convex lens 2 at an angle θ13 of about 34 ° with the main optical axis CL of the illumination device.

また、第1の実施形態の照明装置10では、図4および図6(B)に示すように、照明装置の主光軸線CLと約65°をなして白色LED1から放射された弱い光L14が、凸レンズ2の入射面2aの凸部2a2(図2参照)の頂部2a2a(図2参照)において屈折し、次いで、側壁2a3(図2参照)によって反射され、次いで、出射面2bの平面部2b2において屈折し、照明装置の主光軸線CLと約25°の角度θ14をなして凸レンズ2の出射面2bから照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown in FIG.4 and FIG.6 (B), the weak light L14 radiated | emitted from the white LED 1 at about 65 degrees and the main optical axis line CL of the illuminating device is emitted. Refracted at the top 2a2a (see FIG. 2) of the convex portion 2a2 (see FIG. 2) of the incident surface 2a of the convex lens 2, and then reflected by the side wall 2a3 (see FIG. 2), and then the flat portion 2b2 of the exit surface 2b. And is irradiated from the exit surface 2b of the convex lens 2 at an angle θ14 of about 25 ° with the main optical axis CL of the illumination device.

更に、第1の実施形態の照明装置10では、図4および図7(A)に示すように、照明装置の主光軸線CLと約70°をなして白色LED1から放射された弱い光L15が、凸レンズ2の入射面2aの側壁2a3(図2参照)において屈折し、次いで、凹部2a1の底部2a1a(図2参照)において屈折し、次いで、出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約44°の角度θ15をなして凸レンズ2の出射面2bから照射される。   Furthermore, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 7A, the weak light L15 emitted from the white LED 1 at about 70 ° with the main optical axis CL of the illumination device is generated. Refracted at the side wall 2a3 (see FIG. 2) of the incident surface 2a of the convex lens 2, then refracted at the bottom 2a1a (see FIG. 2) of the concave portion 2a1, and then refracted at the convex surface portion 2b1 of the exit surface 2b. The light is irradiated from the exit surface 2b of the convex lens 2 at an angle θ15 of about 44 ° with the main optical axis CL of the apparatus.

また、第1の実施形態の照明装置10では、図4および図7(A)に示すように、照明装置の主光軸線CLと約75°をなして白色LED1から放射された弱い光L16が、凸レンズ2の入射面2aの側壁2a3(図2参照)において屈折し、次いで、凹部2a1の底部2a1a(図2参照)において屈折し、次いで、出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約57°の角度θ16をなして凸レンズ2の出射面2bから照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown to FIG. 4 and FIG. 7 (A), the weak light L16 radiated | emitted from white LED 1 at about 75 degrees and the main optical axis line CL of an illuminating device is made. Refracted at the side wall 2a3 (see FIG. 2) of the incident surface 2a of the convex lens 2, then refracted at the bottom 2a1a (see FIG. 2) of the concave portion 2a1, and then refracted at the convex surface portion 2b1 of the exit surface 2b. The light is irradiated from the exit surface 2b of the convex lens 2 at an angle θ16 of about 57 ° with the main optical axis CL of the apparatus.

更に、第1の実施形態の照明装置10では、図4および図7(B)に示すように、照明装置の主光軸線CLと約85°をなして白色LED1から放射された弱い光L17が、凸レンズ2の入射面2aの凸部2a2(図2参照)の頂部2a2a(図2参照)において屈折し、次いで、側壁2a3(図2参照)において屈折し、次いで、凹部2a1の底部2a1a(図2参照)において屈折し、次いで、出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約52°の角度θ17をなして凸レンズ2の出射面2bから照射される。   Furthermore, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 7B, the weak light L17 emitted from the white LED 1 is about 85 ° with the main optical axis CL of the illumination device. Refracted at the top 2a2a (see FIG. 2) of the convex portion 2a2 (see FIG. 2) of the incident surface 2a of the convex lens 2, then refracted at the side wall 2a3 (see FIG. 2), and then the bottom 2a1a (see FIG. 2) of the concave portion 2a1. 2), and then refracted at the convex surface portion 2b1 of the exit surface 2b, and irradiated from the exit surface 2b of the convex lens 2 at an angle θ17 of about 52 ° with the main optical axis CL of the illumination device.

また、第1の実施形態の照明装置10では、図4および図7(B)に示すように、照明装置の主光軸線CLと約80°をなして白色LED1から放射された弱い光L18が、凸レンズ2の入射面2aの凸部2a2(図2参照)の頂部2a2a(図2参照)において屈折し、次いで、側壁2a3(図2参照)において屈折し、次いで、凹部2a1の底部2a1a(図2参照)において屈折し、次いで、出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約59°の角度θ18をなして凸レンズ2の出射面2bから照射される。   Moreover, in the illuminating device 10 of 1st Embodiment, as shown in FIG.4 and FIG.7 (B), the weak light L18 radiated | emitted from white LED1 at about 80 degrees and the main optical axis line CL of the illuminating device is made. Refracted at the top 2a2a (see FIG. 2) of the convex portion 2a2 (see FIG. 2) of the incident surface 2a of the convex lens 2, then refracted at the side wall 2a3 (see FIG. 2), and then the bottom 2a1a (see FIG. 2) of the concave portion 2a1. 2), and then refracted at the convex surface portion 2b1 of the exit surface 2b, and irradiated from the exit surface 2b of the convex lens 2 at an angle θ18 of about 59 ° with the main optical axis CL of the illumination device.

更に、第1の実施形態の照明装置10では、図4および図7(C)に示すように、照明装置の主光軸線CLと約80°をなして白色LED1から放射された弱い光L19が、凸レンズ2の入射面2aの凸部2a2(図2参照)の頂部2a2a(図2参照)において屈折し、次いで、側壁2a3(図2参照)において屈折し、次いで、凹部2a1の底部2a1a(図2参照)において屈折し、次いで、出射面2bの凸状面部2b1において屈折し、照明装置の主光軸線CLと約19°の角度θ19をなして凸レンズ2の出射面2bから照射される。   Further, in the illumination device 10 of the first embodiment, as shown in FIGS. 4 and 7C, the weak light L19 emitted from the white LED 1 is about 80 ° with the main optical axis CL of the illumination device. Refracted at the top 2a2a (see FIG. 2) of the convex portion 2a2 (see FIG. 2) of the incident surface 2a of the convex lens 2, then refracted at the side wall 2a3 (see FIG. 2), and then the bottom 2a1a (see FIG. 2) of the concave portion 2a1. 2), and then refracted at the convex surface portion 2b1 of the exit surface 2b, and irradiated from the exit surface 2b of the convex lens 2 at an angle θ19 of about 19 ° with the main optical axis CL of the illumination device.

以下、本発明の照明装置の第2の実施形態について説明する。第2の実施形態の照明装置は、後述する点を除き、上述した第1の実施形態の照明装置10とほぼ同様に構成されている。従って、第2の実施形態の照明装置によれば、後述する点を除き、上述した第1の実施形態の照明装置10とほぼ同様の効果を奏することができる。   Hereinafter, a second embodiment of the illumination device of the present invention will be described. The lighting device of the second embodiment is configured in substantially the same manner as the lighting device 10 of the first embodiment described above, except for the points described below. Therefore, according to the illuminating device of 2nd Embodiment, except the point mentioned later, there can exist an effect similar to the illuminating device 10 of 1st Embodiment mentioned above.

図8は第2の実施形態の照明装置10を示した図である。詳細には、図8(A)は照明装置の主光軸線CLを含む平面によって切断された第2の実施形態の照明装置10の断面図、図8(B)は照明装置の主光軸線CLを含む平面によって切断された凸レンズ2の断面図、図8(C)は凸レンズ2の底面図(図8(B)の下側から見た図)である。図9は図8(A)に示した凸レンズ2の入射面2aの拡大断面図である。   FIG. 8 is a diagram illustrating the illumination device 10 according to the second embodiment. Specifically, FIG. 8A is a cross-sectional view of the illumination device 10 of the second embodiment cut by a plane including the main optical axis CL of the illumination device, and FIG. 8B is a main optical axis CL of the illumination device. FIG. 8C is a bottom view of the convex lens 2 (viewed from the lower side in FIG. 8B). FIG. 9 is an enlarged cross-sectional view of the incident surface 2a of the convex lens 2 shown in FIG.

第2の実施形態の照明装置10では、図1および図8に示すように、第1の実施形態の照明装置10と同様の白色LED1が用いられている。また、第2の実施形態の照明装置10では、図1および図8に示すように、第1の実施形態の照明装置10と同様に、白色LED1からの光を配光制御するために、例えば樹脂材料の成形によって形成された凸レンズ2が設けられている。   In the illuminating device 10 of 2nd Embodiment, as shown in FIG.1 and FIG.8, white LED1 similar to the illuminating device 10 of 1st Embodiment is used. Moreover, in the illuminating device 10 of 2nd Embodiment, as shown to FIG. 1 and FIG. 8, in order to carry out light distribution control of the light from white LED1 similarly to the illuminating device 10 of 1st Embodiment, for example, A convex lens 2 formed by molding a resin material is provided.

第1の実施形態の照明装置10では、図1および図2に示すように、凸レンズ2の入射面2aが、フレネルレンズ形状に形成されているが、第2の実施形態の照明装置10では、代わりに、図8および図9に示すように、複数のクレーター状の凹部2a1が凸レンズ2の入射面2aに形成されている。   In the illuminating device 10 of the first embodiment, as shown in FIGS. 1 and 2, the incident surface 2a of the convex lens 2 is formed in a Fresnel lens shape, but in the illuminating device 10 of the second embodiment, Instead, as shown in FIGS. 8 and 9, a plurality of crater-like recesses 2 a 1 are formed on the incident surface 2 a of the convex lens 2.

詳細には、第2の実施形態の照明装置10では、図8および図9に示すように、複数の概略円錐台状の穴2a’(図9参照)を凸レンズ2の入射面2aに形成することによって凹部2a1が形成され、概略円錐台状の穴2a’が形成されない位置に凸部2a2が残されている。また、概略円錐台状の穴2a’の側面によって凹部2a1および凸部2a2の側壁2a3が構成されている。   In detail, in the illuminating device 10 of 2nd Embodiment, as shown to FIG. 8 and FIG. 9, the several frustoconical hole 2a '(refer FIG. 9) is formed in the entrance plane 2a of the convex lens 2. As shown in FIG. Thus, the concave portion 2a1 is formed, and the convex portion 2a2 is left at a position where the substantially frustoconical hole 2a ′ is not formed. Further, the side surface of the concave portion 2a1 and the side wall 2a3 of the convex portion 2a2 is constituted by the side surface of the substantially truncated cone-shaped hole 2a '.

更に詳細には、第2の実施形態の照明装置10では、図8および図9に示すように、半径R1(図9参照)を有する円弧を、概略円錐台状の穴2a’の中心軸線を中心に回転させることにより、凹部2a1の底部2a1aが滑らかに面取りされている。また、半径R2(図9参照)を有する円弧を、概略円錐台状の穴2a’の中心軸線を中心に回転させることにより、凸部2a2の頂部2a2aが滑らかに面取りされている。   More specifically, in the illumination device 10 according to the second embodiment, as shown in FIGS. 8 and 9, an arc having a radius R1 (see FIG. 9) is used as the central axis of the generally frustoconical hole 2a ′. By rotating to the center, the bottom 2a1a of the recess 2a1 is smoothly chamfered. Further, by rotating an arc having a radius R2 (see FIG. 9) about the central axis of the substantially frustoconical hole 2a ', the top 2a2a of the convex portion 2a2 is smoothly chamfered.

第2の実施形態の照明装置10では、図9に示すように、隣接する2個の凹部2a1のピッチPが例えば約1mmに設定され、半径R1,R2が例えば約0.2mmに設定され、凹部2a1の深さDが例えば約0.7mmに設定されている。   In the illuminating device 10 of the second embodiment, as shown in FIG. 9, the pitch P of the two adjacent recesses 2a1 is set to about 1 mm, for example, and the radii R1 and R2 are set to about 0.2 mm, for example. The depth D of the recess 2a1 is set to about 0.7 mm, for example.

換言すれば、第2の実施形態の照明装置10では、図8および図9に示すように、白色LED1からの光が入射される入射面2aが、凸レンズ2の表面のうち、白色LED1の光透過性封止部材1cに対向する位置に形成されている。   In other words, in the illumination device 10 of the second embodiment, as shown in FIGS. 8 and 9, the incident surface 2 a on which the light from the white LED 1 is incident is the light of the white LED 1 among the surfaces of the convex lens 2. It is formed at a position facing the permeable sealing member 1c.

また、第2の実施形態の照明装置10では、図8および図9に示すように、凸レンズ2の入射面2aが、例えば19個の凹部2a1とそれらの間に位置する凸部2a2とを有する凹凸形状に形成されている。   Moreover, in the illuminating device 10 of 2nd Embodiment, as shown in FIG.8 and FIG.9, the entrance plane 2a of the convex lens 2 has 19 recessed part 2a1 and the convex part 2a2 located among them, for example. It is formed in an uneven shape.

更に、第2の実施形態の照明装置10では、図8(A)および図8(B)に示すように、凸レンズ2の入射面2aの凹部2a1の底部2a1aが、照明装置の主光軸線CL上に配置されている。また、凸レンズ2の出射面2bに凸状面部2b1と平面部2b2とが形成されている。更に、凸レンズ2の出射面2bの平面部2b2が、照明装置の主光軸線CL上に配置されている。   Furthermore, in the illuminating device 10 of 2nd Embodiment, as shown to FIG. 8 (A) and FIG. 8 (B), the bottom part 2a1a of the recessed part 2a1 of the entrance plane 2a of the convex lens 2 is the main optical axis line CL of the illuminating device. Is placed on top. A convex surface portion 2b1 and a flat surface portion 2b2 are formed on the exit surface 2b of the convex lens 2. Furthermore, the plane part 2b2 of the exit surface 2b of the convex lens 2 is disposed on the main optical axis CL of the illumination device.

換言すれば、第2の実施形態の照明装置10では、第1の実施形態の照明装置10と同様に、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L1,L2,L3,L4(図3(A)および図3(B)参照)が、照明装置の主光軸線CLと大きい角度θ1,θ2,θ3,θ4(図3(A)および図3(B)参照)をなして凸レンズ2から照射され、かつ、蛍光体によって黄色系に変換される割合が高い光透過性封止部材1cの外周部1c2付近からの光L5(図3(C)参照)が、照明装置の主光軸線CLと小さい角度θ5(<θ1,θ2,θ3,θ4)(図3(C)参照)をなして凸レンズ2から照射されるように、凸レンズ2の入射面2aが、複数の凹部2a1と複数の凸部2a2とを有する凹凸形状に形成されている。   In other words, in the illuminating device 10 of the second embodiment, as in the illuminating device 10 of the first embodiment, the central portion of the light-transmitting sealing member 1c that has a low ratio of being converted to yellow by the phosphor. Lights L1, L2, L3, and L4 from the vicinity of 1c1 (see FIGS. 3A and 3B) have large angles θ1, θ2, θ3, and θ4 with respect to the main optical axis CL of the illumination device (FIG. 3A ) And FIG. 3 (B)), and light L5 from the vicinity of the outer peripheral portion 1c2 of the light-transmitting sealing member 1c that is irradiated from the convex lens 2 and is converted to yellow by the phosphor (see FIG. 3). 3 (C)) is irradiated from the convex lens 2 at a small angle θ5 (<θ1, θ2, θ3, θ4) (see FIG. 3C) with the main optical axis CL of the illumination device. 2 in which the incident surface 2a has a plurality of concave portions 2a1 and a plurality of convex portions 2a2. It is formed in Jo.

つまり、特開2005−216782号公報の図1、図5、図8に記載された照明装置のように、蛍光体によって黄色系に変換される割合が高い光透過性封止部材の外周部付近からの光が、凸レンズの入射面から凸レンズの径方向にかなり離れた位置に配置されている周辺反射面により、蛍光体によって黄色系に変換される割合が低い光透過性封止部材の中央部付近からの光の照射エリアの中心付近に指向せしめられるのではなく、第2の実施形態の照明装置10では、第1の実施形態の照明装置10と同様に、蛍光体によって黄色系に変換される割合が高い光透過性封止部材1cの外周部1c2付近からの光L5が、白色LED1の光透過性封止部材1cに対向する位置に配置されている凸レンズ2の入射面2aにより、蛍光体によって黄色系に変換される割合が低い光透過性封止部材1cの中央部1c1付近からの光L1,L2,L3,L4の照射エリアの中心付近に指向せしめられる。   That is, in the vicinity of the outer peripheral portion of the light-transmitting sealing member that has a high ratio of being converted to a yellow color by the phosphor as in the lighting device described in FIG. 1, FIG. 5, and FIG. The central portion of the light-transmitting sealing member that has a low rate of being converted to yellow by the phosphor by the peripheral reflection surface arranged at a position that is considerably away from the incident surface of the convex lens in the radial direction of the convex lens Rather than being directed near the center of the irradiation area of light from the vicinity, in the illumination device 10 of the second embodiment, it is converted into a yellow color by the phosphor as in the illumination device 10 of the first embodiment. The light L5 from the vicinity of the outer peripheral portion 1c2 of the light-transmitting sealing member 1c having a high ratio is reflected by the incident surface 2a of the convex lens 2 disposed at a position facing the light-transmitting sealing member 1c of the white LED 1. Yellow by body Percentage that is converted to the system is brought into directed light L1, L2, L3, L4 near the center of the illumination area from the vicinity of the center portion 1c1 of the low light-transmissive sealing member 1c.

そのため、第2の実施形態の照明装置10によれば、第1の実施形態の照明装置10と同様に、特開2005−216782号公報の図1、図5、図8に記載された照明装置よりも凸レンズ2を小型化しつつ、凸レンズ2からの照射光の照射エリアの外周部付近に黄色の色ムラが形成されてしまうのを回避することができる。   Therefore, according to the illuminating device 10 of 2nd Embodiment, the illuminating device described in FIG.1, FIG.5, FIG.8 of Unexamined-Japanese-Patent No. 2005-216682 is similar to the illuminating device 10 of 1st Embodiment. In addition, it is possible to avoid the formation of yellow color unevenness in the vicinity of the outer peripheral portion of the irradiation area of the irradiation light from the convex lens 2 while reducing the size of the convex lens 2.

以下、本発明の第1または第2の実施形態の照明装置10が適用される第1例について説明する。第1例では、上述した第1または第2の実施形態の照明装置10が、看板照明装置に適用される。図10は第1または第2の実施形態の照明装置10が適用された看板照明装置20の一部の断面図である。   Hereinafter, a first example to which the illumination device 10 of the first or second embodiment of the present invention is applied will be described. In the first example, the lighting device 10 of the first or second embodiment described above is applied to a signboard lighting device. FIG. 10 is a cross-sectional view of a part of the signboard illumination device 20 to which the illumination device 10 of the first or second embodiment is applied.

第1または第2の実施形態の照明装置10が適用された看板照明装置20では、図10に示すように、第1または第2の実施形態の照明装置10が複数設けられている。つまり、照明装置の主光軸線CLと約50°をなして凸レンズ2から照射される光の光度が、照明装置の主光軸線CL方向に凸レンズ2から照射される光の光度よりも高い配光特性(図4中の実線PT2)を有する照明装置10が複数設けられている。   In the signboard lighting device 20 to which the lighting device 10 of the first or second embodiment is applied, a plurality of the lighting devices 10 of the first or second embodiment are provided as shown in FIG. That is, the luminous intensity of light emitted from the convex lens 2 at about 50 ° with the main optical axis CL of the illumination device is higher than the luminous intensity of light emitted from the convex lens 2 in the direction of the main optical axis CL of the illumination device. A plurality of lighting devices 10 having characteristics (solid line PT2 in FIG. 4) are provided.

また、第1または第2の実施形態の照明装置10が適用された看板照明装置20では、図10に示すように、複数の照明装置10が照明装置の主光軸線CLに直交する方向に例えば約100mmのような間隔Aを隔てて配列されている。そのため、第1または第2の実施形態の照明装置10が適用された看板照明装置20によれば、図4に破線PT1で示す配光特性を有する複数の照明装置が、照明装置の主光軸線に直交する方向に間隔Aを隔てて配列されている看板照明装置よりも、隣接する2個の照明装置10の中間の部分を明るくすることができる。   Further, in the signboard lighting device 20 to which the lighting device 10 of the first or second embodiment is applied, as shown in FIG. 10, for example, the plurality of lighting devices 10 are arranged in a direction orthogonal to the main optical axis CL of the lighting device. They are arranged at an interval A such as about 100 mm. Therefore, according to the signboard illuminating device 20 to which the illuminating device 10 of the first or second embodiment is applied, a plurality of illuminating devices having a light distribution characteristic indicated by a broken line PT1 in FIG. As compared with the signboard illuminating devices arranged at a distance A in the direction orthogonal to, the intermediate portion between the two adjacent illuminating devices 10 can be brightened.

更に、第1または第2の実施形態の照明装置10が適用された看板照明装置20では、図10に示すように、照明装置10の凸レンズ2からの照射光によって照射される看板21が、間隔Aの約2分の1の距離B(例えば約50mm)だけ照明装置10から照明装置の主光軸線CL方向に離間せしめられて配置されている。つまり、第1または第2の実施形態の照明装置10が適用された看板照明装置20では、看板21が照明装置10から近い位置に配置されている。そのため、第1または第2の実施形態の照明装置10が適用された看板照明装置20によれば、照明装置の主光軸線CL方向の看板照明装置20の寸法を小型化しつつ、隣接する2個の照明装置10の中間の部分が暗くなってしまうのを回避することができる。   Furthermore, in the signboard illumination device 20 to which the illumination device 10 of the first or second embodiment is applied, as shown in FIG. 10, the signboard 21 irradiated by the irradiation light from the convex lens 2 of the illumination device 10 has an interval. The lighting device 10 is disposed so as to be separated from the lighting device 10 in the direction of the main optical axis CL by a distance B (for example, about 50 mm) that is about a half of A. That is, in the signboard illumination device 20 to which the illumination device 10 of the first or second embodiment is applied, the signboard 21 is disposed at a position close to the illumination device 10. Therefore, according to the signboard illumination apparatus 20 to which the illumination apparatus 10 of the first or second embodiment is applied, the two adjacent signboard illumination apparatuses 20 in the direction of the main optical axis CL of the illumination apparatus are reduced. It can be avoided that the middle part of the lighting device 10 becomes dark.

以下、本発明の第1または第2の実施形態の照明装置10が適用される第2例について説明する。第2例では、上述した第1または第2の実施形態の照明装置10が、直下型液晶パネル用バックライト装置に適用される。図11は第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30の一部の断面図である。   Hereinafter, a second example to which the illumination device 10 of the first or second embodiment of the present invention is applied will be described. In the second example, the illumination device 10 of the first or second embodiment described above is applied to a backlight device for a direct type liquid crystal panel. FIG. 11 is a partial cross-sectional view of a backlight device 30 for a direct liquid crystal panel to which the illumination device 10 of the first or second embodiment is applied.

第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30では、図11に示すように、第1または第2の実施形態の照明装置10が複数設けられている。つまり、照明装置の主光軸線CLと約50°をなして凸レンズ2から照射される光の光度が、照明装置の主光軸線CL方向に凸レンズ2から照射される光の光度よりも高い配光特性(図4中の実線PT2)を有する照明装置10が複数設けられている。   In the backlight unit 30 for a direct type liquid crystal panel to which the lighting device 10 of the first or second embodiment is applied, as shown in FIG. 11, a plurality of the lighting devices 10 of the first or second embodiment are provided. ing. That is, the luminous intensity of light emitted from the convex lens 2 at about 50 ° with the main optical axis CL of the illumination device is higher than the luminous intensity of light emitted from the convex lens 2 in the direction of the main optical axis CL of the illumination device. A plurality of lighting devices 10 having characteristics (solid line PT2 in FIG. 4) are provided.

また、第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30では、図11に示すように、複数の照明装置10が照明装置の主光軸線CLに直交する方向に間隔Cを隔てて配列されている。そのため、第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30によれば、図4に破線PT1で示す配光特性を有する複数の照明装置が、照明装置の主光軸線に直交する方向に間隔Cを隔てて配列されている直下型液晶パネル用バックライト装置よりも、隣接する2個の照明装置10の中間の部分を明るくすることができる。   Further, in the direct-type liquid crystal panel backlight device 30 to which the illumination device 10 of the first or second embodiment is applied, as shown in FIG. 11, the plurality of illumination devices 10 are on the main optical axis CL of the illumination device. They are arranged at intervals C in the orthogonal direction. Therefore, according to the backlight device 30 for a direct type liquid crystal panel to which the illumination device 10 of the first or second embodiment is applied, a plurality of illumination devices having a light distribution characteristic indicated by a broken line PT1 in FIG. Compared to the backlight unit for a direct type liquid crystal panel arranged at a distance C in the direction orthogonal to the main optical axis of the device, the intermediate portion between the two adjacent lighting devices 10 can be brightened.

更に、第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30では、図11に示すように、照明装置10の凸レンズ2からの照射光によって照射される液晶パネル31が、間隔Cの約2分の1の距離Dだけ照明装置10から照明装置の主光軸線CL方向に離間せしめられて配置されている。つまり、第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30では、液晶パネル31が照明装置10から近い位置に配置されている。そのため、第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30によれば、照明装置の主光軸線CL方向の直下型液晶パネル用バックライト装置30の寸法を小型化しつつ、隣接する2個の照明装置10の中間の部分が暗くなってしまうのを回避することができる。   Furthermore, in the backlight device 30 for a direct type liquid crystal panel to which the illumination device 10 of the first or second embodiment is applied, as shown in FIG. 11, the illumination device 10 irradiates with irradiation light from the convex lens 2 of the illumination device 10. The liquid crystal panel 31 is disposed so as to be separated from the illuminating device 10 in the direction of the main optical axis CL of the illuminating device by a distance D that is approximately a half of the interval C. That is, in the direct-type liquid crystal panel backlight device 30 to which the illumination device 10 of the first or second embodiment is applied, the liquid crystal panel 31 is disposed at a position close to the illumination device 10. Therefore, according to the direct-type liquid crystal panel backlight device 30 to which the illumination device 10 of the first or second embodiment is applied, the direct-type liquid crystal panel backlight device 30 in the direction of the main optical axis CL of the illumination device. While the size is reduced, it is possible to avoid the middle portion between the two adjacent lighting devices 10 from becoming dark.

第1の実施形態の照明装置10を示した図である。It is the figure which showed the illuminating device 10 of 1st Embodiment. 図1(A)に示した凸レンズ2の入射面2aの拡大断面図である。It is an expanded sectional view of the entrance plane 2a of the convex lens 2 shown in FIG. 図1(A)に示した断面内における光路を示した図である。It is the figure which showed the optical path in the cross section shown to FIG. 1 (A). 第1の実施形態の照明装置10の配光特性を示した図である。It is the figure which showed the light distribution characteristic of the illuminating device 10 of 1st Embodiment. 図1(A)に示した断面内における光路を示した図である。It is the figure which showed the optical path in the cross section shown to FIG. 1 (A). 図1(A)に示した断面内における光路を示した図である。It is the figure which showed the optical path in the cross section shown to FIG. 1 (A). 図1(A)に示した断面内における光路を示した図である。It is the figure which showed the optical path in the cross section shown to FIG. 1 (A). 第2の実施形態の照明装置10を示した図である。It is the figure which showed the illuminating device 10 of 2nd Embodiment. 図8(A)に示した凸レンズ2の入射面2aの拡大断面図である。It is an expanded sectional view of the entrance plane 2a of the convex lens 2 shown to FIG. 8 (A). 第1または第2の実施形態の照明装置10が適用された看板照明装置20の一部の断面図である。It is sectional drawing of a part of signboard illuminating device 20 to which the illuminating device 10 of 1st or 2nd embodiment was applied. 第1または第2の実施形態の照明装置10が適用された直下型液晶パネル用バックライト装置30の一部の断面図である。It is sectional drawing of a part of backlight apparatus 30 for direct type liquid crystal panels to which the illuminating device 10 of 1st or 2nd embodiment was applied.

符号の説明Explanation of symbols

1 白色LED
1a 発光素子
1b リフレクタ
1c 光透過性封止部材
1c1 中央部
1c2 外周部
2 凸レンズ
2a 入射面
2a1 凹部
2a1a 底部
2a2 凸部
2a2a 頂部
2a3 側壁
10 照明装置
1 White LED
DESCRIPTION OF SYMBOLS 1a Light emitting element 1b Reflector 1c Light transmissive sealing member 1c1 Center part 1c2 Outer peripheral part 2 Convex lens 2a Incident surface 2a1 Concave part 2a1a Bottom part 2a2 Convex part 2a2a Top part 2a3 Side wall 10 Illumination device

Claims (7)

青色系の光を発光する発光素子(1a)が概略すり鉢状のリフレクタ(1b)によって取り囲まれ、
そのリフレクタ(1b)によって取り囲まれる空間に、発光素子(1a)からの青色系の光によって励起されて黄色系の蛍光を発する蛍光体を含有する光透過性封止部材(1c)が充填され、
発光素子(1a)からの青色系の光と蛍光体からの黄色系の蛍光とが混ざった白色光を放射するように白色LED(1)が構成され、
白色LED(1)からの光を配光制御するための凸レンズ(2)が設けられ、
白色LED(1)からの光が入射される入射面(2a)が、凸レンズ(2)の表面のうち、白色LED(1)の光透過性封止部材(1c)に対向する位置に形成されている照明装置(10)において、
蛍光体によって黄色系に変換される割合が低い光透過性封止部材(1c)の中央部(1c1)付近からの光(L1,L2,L3,L4)が、照明装置の主光軸線(CL)と大きい角度(θ1,θ2,θ3,θ4)をなして凸レンズ(2)から照射され、かつ、蛍光体によって黄色系に変換される割合が高い光透過性封止部材(1c)の外周部(1c2)付近からの光(L5)が、照明装置の主光軸線(CL)と小さい角度(θ5)をなして凸レンズ(2)から照射されるように、凸レンズ(2)の入射面(2a)が、複数の凹部(2a1)と複数の凸部(2a2)とを有する凹凸形状に形成されていることを特徴とする照明装置(10)。
A light emitting element (1a) emitting blue light is surrounded by a roughly mortar-shaped reflector (1b),
The space surrounded by the reflector (1b) is filled with a light-transmitting sealing member (1c) containing a phosphor that is excited by blue light from the light emitting element (1a) and emits yellow fluorescence,
The white LED (1) is configured to emit white light in which blue light from the light emitting element (1a) and yellow fluorescent light from the phosphor are mixed,
A convex lens (2) for controlling the light distribution of the light from the white LED (1) is provided,
The incident surface (2a) on which light from the white LED (1) is incident is formed at a position facing the light-transmissive sealing member (1c) of the white LED (1) on the surface of the convex lens (2). In the lighting device (10)
The light (L1, L2, L3, L4) from the vicinity of the central portion (1c1) of the light-transmitting sealing member (1c) that is converted into a yellow color by the phosphor is the main optical axis (CL) of the illumination device. ) And a large angle (θ1, θ2, θ3, θ4) and the outer peripheral portion of the light-transmitting sealing member (1c) that is irradiated from the convex lens (2) and is converted to yellow by the phosphor. (1c2) The incident surface (2a) of the convex lens (2) so that light (L5) from the vicinity is irradiated from the convex lens (2) at a small angle (θ5) with the main optical axis (CL) of the illumination device. ) Is formed in a concavo-convex shape having a plurality of concave portions (2a1) and a plurality of convex portions (2a2).
照明装置の主光軸線(CL)を中心に照明装置の主光軸線(CL)と約10〜20°をなす複数の線分(A1,A2,A3,A4)を回転させることにより、複数の凹部(2a1)および複数の凸部(2a2)の側壁(2a3)を形成し、
隣接する2個の環状の凸部(2a2)のピッチ(P)の約5分の1の大きさの半径(R1,R2)を有する複数の円弧を、照明装置の主光軸線(CL)を中心に回転させることにより、凹部(2a1)の底部(2a1a)と凸部(2a2)の頂部(2a2a)とを形成し、
それにより、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が最も高く、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度の約75%になる配光特性を形成することを特徴とする請求項1に記載の照明装置(10)。
By rotating a plurality of line segments (A1, A2, A3, A4) that form about 10 to 20 degrees with the main optical axis (CL) of the lighting device around the main optical axis (CL) of the lighting device, Forming the side wall (2a3) of the concave portion (2a1) and the plurality of convex portions (2a2);
A plurality of arcs having radii (R1, R2) having a size of about one fifth of the pitch (P) of two adjacent annular convex portions (2a2) are used as the main optical axis (CL) of the illuminating device. By rotating to the center, the bottom (2a1a) of the recess (2a1) and the top (2a2a) of the projection (2a2) are formed,
Thereby, the luminous intensity of the light irradiated from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illuminating device is the highest, and from the convex lens (2) in the main optical axis (CL) direction of the illuminating device. The luminous intensity is such that the luminous intensity of the emitted light is approximately 50% of the luminous intensity of the light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illumination device. The lighting device (10) according to claim 1.
樹脂材料の成形によって凸レンズ(2)を形成し、
隣接する2個の環状の凸部(2a2)のピッチ(P)を約1mmに設定し、
半径(R2)が約0.2mmの円弧を、照明装置の主光軸線(CL)を中心に回転させることにより、凸部(2a2)の頂部(2a2a)を形成したことを特徴とする請求項2に記載の照明装置(10)。
A convex lens (2) is formed by molding a resin material,
The pitch (P) of two adjacent annular convex portions (2a2) is set to about 1 mm,
The top part (2a2a) of the convex part (2a2) is formed by rotating an arc having a radius (R2) of about 0.2 mm around the main optical axis (CL) of the illumination device. The lighting device (10) according to 2.
凹部(2a1)の底部(2a1a)を照明装置の主光軸線(CL)上に配置し、
凸レンズ(2)の出射面(2b)に凸状面部(2b1)と平面部(2b2)とを形成し、
平面部(2b2)を照明装置の主光軸線(CL)上に配置したことを特徴とする請求項3に記載の照明装置(10)。
The bottom (2a1a) of the recess (2a1) is disposed on the main optical axis (CL) of the lighting device,
Forming a convex surface portion (2b1) and a flat surface portion (2b2) on the exit surface (2b) of the convex lens (2);
The illuminating device (10) according to claim 3, wherein the flat portion (2b2) is arranged on a main optical axis (CL) of the illuminating device.
複数の概略円錐台状の穴(2a’)を凸レンズ(2)の入射面(2a)に形成することにより、複数の凹部(2a1)と複数の凸部(2a2)とを凸レンズ(2)の入射面(2a)に形成し、
円錐台状の穴(2a’)の中心軸線を中心に複数の円弧を回転させることにより、凹部(2a1)の底部(2a1a)と凸部(2a2)の頂部(2a2a)とを形成し、
それにより、照明装置の主光軸線(CL)と約50°をなして凸レンズ(2)から照射される光の光度が、照明装置の主光軸線(CL)方向に凸レンズ(2)から照射される光の光度よりも高い配光特性を形成することを特徴とする請求項1に記載の照明装置(10)。
A plurality of concave portions (2a1) and a plurality of convex portions (2a2) are formed on the convex lens (2) by forming a plurality of substantially frustoconical holes (2a ′) on the incident surface (2a) of the convex lens (2). Formed on the incident surface (2a),
By rotating a plurality of arcs around the central axis of the frustoconical hole (2a ′), the bottom (2a1a) of the recess (2a1) and the top (2a2a) of the projection (2a2) are formed,
Thereby, the luminous intensity of the light emitted from the convex lens (2) at about 50 ° with the main optical axis (CL) of the illumination device is emitted from the convex lens (2) in the direction of the main optical axis (CL) of the illumination device. The lighting device (10) according to claim 1, characterized in that the light distribution characteristic is higher than the luminous intensity of the light.
請求項2〜5のいずれか一項に記載の照明装置(10)が複数設けられ、
複数の照明装置(10)が照明装置の主光軸線(CL)に直交する方向に間隔Aを隔てて配列され、
照明装置(10)の凸レンズ(2)からの照射光によって照射される看板(21)が、間隔Aの約2分の1の距離Bだけ照明装置(10)から照明装置の主光軸線(CL)方向に離間せしめられて配置されていることを特徴とする看板照明装置(20)。
A plurality of lighting devices (10) according to any one of claims 2 to 5 are provided,
A plurality of lighting devices (10) are arranged at intervals A in a direction perpendicular to the main optical axis (CL) of the lighting device,
The signboard (21) irradiated by the irradiation light from the convex lens (2) of the illuminating device (10) is moved from the illuminating device (10) to the main optical axis (CL) of the illuminating device by a distance B that is approximately a half of the interval A. The signboard illumination device (20), being spaced apart in the direction).
請求項2〜5のいずれか一項に記載の照明装置(10)が複数設けられ、
複数の照明装置(10)が照明装置の主光軸線(CL)に直交する方向に間隔Cを隔てて配列され、
照明装置(10)の凸レンズ(2)からの照射光によって照射される液晶パネル(31)が、間隔Cの約2分の1の距離Dだけ照明装置(10)から照明装置の主光軸線(CL)方向に離間せしめられて配置されていることを特徴とする直下型液晶パネル用バックライト装置(30)。
A plurality of lighting devices (10) according to any one of claims 2 to 5 are provided,
A plurality of lighting devices (10) are arranged at intervals C in a direction perpendicular to the main optical axis (CL) of the lighting device,
The liquid crystal panel (31) irradiated with the irradiation light from the convex lens (2) of the illuminating device (10) is moved from the illuminating device (10) to the main optical axis ( The backlight device (30) for a direct type liquid crystal panel, which is spaced apart in the CL direction.
JP2008035547A 2008-02-18 2008-02-18 Lighting device, signboard lighting device, and backlight device for direct type liquid crystal panel Expired - Fee Related JP4997136B2 (en)

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