JP5820999B2 - Lighting device - Google Patents

Lighting device Download PDF

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JP5820999B2
JP5820999B2 JP2014534158A JP2014534158A JP5820999B2 JP 5820999 B2 JP5820999 B2 JP 5820999B2 JP 2014534158 A JP2014534158 A JP 2014534158A JP 2014534158 A JP2014534158 A JP 2014534158A JP 5820999 B2 JP5820999 B2 JP 5820999B2
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light
annular
reflecting
guide plate
light scattering
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JPWO2014038116A1 (en
Inventor
直樹 小谷
直樹 小谷
一郎 谷村
一郎 谷村
有士 中川
有士 中川
明子 太田
明子 太田
泰一 村中
泰一 村中
龍馬 村瀬
龍馬 村瀬
晋二 角陸
晋二 角陸
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to JP2012194806 priority
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Priority to PCT/JP2013/004017 priority patent/WO2014038116A1/en
Priority to JP2014534158A priority patent/JP5820999B2/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/02Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F21S8/026Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/04Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/02Wall, ceiling, or floor bases; Fixing pendants or arms to the bases
    • F21V21/04Recessed bases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/0008Reflectors for light sources providing for indirect lighting
    • F21V7/0016Reflectors for light sources providing for indirect lighting on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/00362-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/30Elongate light sources, e.g. fluorescent tubes curved
    • F21Y2103/33Elongate light sources, e.g. fluorescent tubes curved annular
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068Arrangements of plural sources, e.g. multi-colour light sources

Description

本発明は、LED(Light Emitting Diode)等の発光素子を光源として備える照明装置に関し、特に、導光板を用いた面発光する照明装置において輝度むらを低減させる技術に関する。   The present invention relates to an illuminating device including a light emitting element such as an LED (Light Emitting Diode) as a light source, and more particularly to a technique for reducing luminance unevenness in an illuminating device that emits light using a light guide plate.

導光板を用いた面発光する照明装置の一例として、図20に示すようなエッジライト方式の照明装置800がある。当該照明装置800では、導光板840の外周に、複数の発光素子822が、それぞれの主出射方向を導光板840に向けた状態で環状に配置されている。発光素子822から出射された光は、導光板840の外周面である入射面840cから導光板840内に入射して、導光板840の表側の面である光出射面840aから均一に出射される。前記導光板840の外周縁には、発光素子822を覆い隠すようにして枠材870が取り付けられており、当該枠材870によって発光素子822の保護や照明装置800の意匠性の向上が図られている(特許文献1)。   As an example of an illumination device that emits light using a light guide plate, there is an edge light illumination device 800 as shown in FIG. In the illuminating device 800, a plurality of light emitting elements 822 are annularly arranged on the outer periphery of the light guide plate 840 with each main emission direction facing the light guide plate 840. The light emitted from the light emitting element 822 enters the light guide plate 840 from the incident surface 840c which is the outer peripheral surface of the light guide plate 840, and is uniformly emitted from the light output surface 840a which is the front side surface of the light guide plate 840. . A frame member 870 is attached to the outer peripheral edge of the light guide plate 840 so as to cover the light emitting element 822, and the frame member 870 protects the light emitting element 822 and improves the design of the lighting device 800. (Patent Document 1).

しかしながら、導光板840の外周縁に枠材870が取り付けられていると、枠材870によって導光板840の外周縁から出射される光が遮られるため、照明装置800の表側を全面発光させることは困難である。   However, if the frame member 870 is attached to the outer peripheral edge of the light guide plate 840, the light emitted from the outer peripheral edge of the light guide plate 840 is blocked by the frame member 870. Have difficulty.

導光板を用いた面発光する照明装置の別の例として、図21に示すような直下型方式の照明装置900がある。当該照明装置900では、導光板940の裏側に、複数の発光素子922がそれぞれの発光素子922の主出射方向を導光板940に向けた状態で環状に配列されている。発光素子922から出射された光は、導光板940の環状部941の裏側に形成された入射面944bから環状部941内に入射して、環状部941の表側の面である反射面941aで反射され、導光板940における環内側部942および環外側部943内に導かれる。そして、環内側部942および環外側部943の表側の面である光出射面942a,943aから均一に出射される。   As another example of an illumination device that emits light using a light guide plate, there is a direct illumination device 900 as shown in FIG. In the lighting device 900, a plurality of light emitting elements 922 are arranged in an annular shape on the back side of the light guide plate 940 with the main emission direction of each light emitting element 922 facing the light guide plate 940. The light emitted from the light emitting element 922 enters the annular portion 941 from the incident surface 944b formed on the back side of the annular portion 941 of the light guide plate 940, and is reflected by the reflecting surface 941a which is the surface on the front side of the annular portion 941. Then, the light is guided into the inner ring portion 942 and the outer ring portion 943 of the light guide plate 940. Then, light is emitted uniformly from the light emitting surfaces 942a and 943a which are the front side surfaces of the ring inner portion 942 and the ring outer portion 943.

照明装置900のように、発光素子922が導光板940の裏側に配置されていると、導光板940の外周縁に枠材を取り付ける必要がなく、枠材によって導光板940の外周縁から出射される光が遮られないため、照明装置900の表側を全面発光させることが可能である。   When the light emitting element 922 is disposed on the back side of the light guide plate 940 as in the lighting device 900, it is not necessary to attach a frame material to the outer peripheral edge of the light guide plate 940, and the light is emitted from the outer peripheral edge of the light guide plate 940 by the frame material. Therefore, the front side of the lighting device 900 can emit light entirely.

特開2012−84316号公報JP 2012-84316 A 特開2012−104476号公報JP 2012-104476 A

しかしながら、照明装置900のような構成では、導光板940の環状部941の反射面941aに、光が殆ど出射されない影の領域が生じるため、その影の領域が照明装置900の輝度むらの原因となる。詳しく説明すると、環状部941の反射面941aは、環内側部942および環外側部943に効率良く光を導くために、光を略全反射するよう形成されており、この反射面941aからは裏側に発光素子922が存在している領域を除いて殆ど表側には光が出射されない。そのため、反射面941aにおける発光素子922が存在している領域以外が影の領域となり、この影の領域が原因となって輝度むらが生じる。   However, in a configuration such as the lighting device 900, a shadow region in which almost no light is emitted is generated on the reflection surface 941a of the annular portion 941 of the light guide plate 940. Therefore, the shadow region causes uneven luminance of the lighting device 900. Become. More specifically, the reflecting surface 941a of the annular portion 941 is formed so as to substantially totally reflect light in order to efficiently guide light to the inner ring portion 942 and the outer ring portion 943, and from the reflecting surface 941a to the back side. Except for the region where the light emitting element 922 exists, light is hardly emitted to the front side. For this reason, a region other than the region where the light emitting element 922 exists on the reflection surface 941a is a shadow region, and luminance unevenness occurs due to the shadow region.

本発明は、上記した課題に鑑み、表側の全面発光を実現可能で且つ輝度むらが少ない照明装置を提供することを目的とする。   In view of the above-described problems, an object of the present invention is to provide an illumination device that can realize front side full-surface light emission and has less luminance unevenness.

上記目的を達成するために、本発明の一態様に係る照明装置は、導光板の裏側に、複数の発光素子がそれぞれの主出射方向を前記導光板に向けた状態で隣合う発光素子間に間隔を設けて環状に配置され、且つ、光反射面を有する反射部材が前記光反射面と前記導光板の裏側の面の一部とが対向した状態で前記導光板に対して近接配置された照明装置であって、前記導光版の裏側の面と直交する方向から見て、前記反射部材は、前記複数の発光素子からなる環状の素子列が収容された環状の溝部と重ならない領域に配置されており、前記溝部は、前記各発光素子に対応する部位の溝幅よりも隣合う発光素子の間隙に対応する部位の溝幅の方が広いことを特徴とする。   In order to achieve the above object, a lighting device according to one embodiment of the present invention includes a plurality of light emitting elements on the back side of a light guide plate between adjacent light emitting elements in a state where each main emission direction faces the light guide plate. A reflecting member that is disposed in an annular shape with a gap and that has a light reflecting surface is disposed close to the light guide plate in a state where the light reflecting surface and a part of the back surface of the light guide plate face each other. In the illumination device, when viewed from a direction orthogonal to the surface on the back side of the light guide plate, the reflecting member is in a region that does not overlap with the annular groove portion in which the annular element row composed of the plurality of light emitting elements is accommodated. The groove portion is characterized in that a groove width at a portion corresponding to a gap between adjacent light emitting elements is wider than a groove width at a portion corresponding to each light emitting element.

本発明の一態様に係る照明装置は、複数の発光素子が導光板の裏側に環状に配置されている。したがって、複数の発光素子を覆い隠すために導光板の外周部に枠材を取り付ける必要がなく、枠材によって導光板の外周縁から出射する光が遮られることがないため、表側を全面発光させることが可能である。   In the lighting device according to one embodiment of the present invention, a plurality of light-emitting elements are annularly arranged on the back side of the light guide plate. Therefore, it is not necessary to attach a frame material to the outer periphery of the light guide plate in order to cover a plurality of light emitting elements, and the light emitted from the outer peripheral edge of the light guide plate is not blocked by the frame material. It is possible.

また、本発明の一態様に係る照明装置は、反射部材が、複数の発光素子からなる環状の素子列が収容された環状の溝部と重ならない領域に配置されており、前記溝部は、前記各発光素子に対応する部位の溝幅よりも隣合う発光素子の間隙に対応する部位の溝幅の方が広い。そのため、間隙に対応する部位は、発光素子に対応する部位と比べて、光が出射し易くなっている。これにより、間隙に対応する部位の輝度が高くなっているため、従来の照明装置よりも輝度むらが軽減されている。   Further, in the lighting device according to one embodiment of the present invention, the reflecting member is disposed in a region that does not overlap with the annular groove portion in which the annular element row including the plurality of light emitting elements is accommodated, The groove width at the portion corresponding to the gap between the adjacent light emitting elements is wider than the groove width at the portion corresponding to the light emitting element. Therefore, the part corresponding to the gap is easier to emit light than the part corresponding to the light emitting element. Thereby, since the brightness | luminance of the site | part corresponding to a clearance gap is high, the brightness nonuniformity is reduced rather than the conventional illuminating device.

第1の実施形態に係る照明装置の天井板への取り付けの態様を説明する図The figure explaining the aspect of the attachment to the ceiling board of the illuminating device which concerns on 1st Embodiment. 第1の実施形態に係る照明装置を示す斜視図The perspective view which shows the illuminating device which concerns on 1st Embodiment. 第1の実施形態に係る照明装置を示す分解斜視図The disassembled perspective view which shows the illuminating device which concerns on 1st Embodiment. 第1の実施形態に係る照明装置を示す断面図Sectional drawing which shows the illuminating device which concerns on 1st Embodiment. 図4に示す二点差線で囲んだ部分の拡大断面図Enlarged sectional view of the portion surrounded by the two-dot chain line shown in FIG. 第1の実施形態に係る反射部材を示す平面図であって、(a)は表側から見た図、(b)は裏側から見た図It is a top view which shows the reflective member which concerns on 1st Embodiment, Comprising: (a) is the figure seen from the front side, (b) is the figure seen from the back side 第1の実施形態に係る導光板を示す平面図であって、(a)は表側から見た図、(b)は裏側から見た図It is a top view which shows the light-guide plate which concerns on 1st Embodiment, Comprising: (a) is the figure seen from the front side, (b) is the figure seen from the back side 従来の照明装置で生じる輝度むらを説明するための図The figure for demonstrating the brightness nonuniformity which arises with the conventional illuminating device. 従来の照明装置で生じる輝度むらを説明するための模式図Schematic diagram for explaining luminance unevenness generated in a conventional lighting device 基板の素子搭載面で反射した光の経路を説明するための模式図Schematic diagram for explaining the path of light reflected from the device mounting surface of the substrate 反射部材による輝度むら低減効果を説明するための模式図Schematic diagram for explaining the luminance unevenness reducing effect by the reflecting member 発光素子から直接導光板内に入射した光の経路を説明するための模式図Schematic diagram for explaining the path of light incident directly from the light emitting element into the light guide plate 導光板による輝度むら低減効果を説明するための模式図Schematic diagram for explaining the effect of reducing luminance unevenness by the light guide plate 導光板と反射部材との組み合わせによる輝度むら低減効果を説明するための図The figure for demonstrating the brightness nonuniformity reduction effect by the combination of a light-guide plate and a reflective member 導光板と反射部材との組み合わせによる輝度むら低減効果を説明するための模式図Schematic diagram for explaining the effect of reducing luminance unevenness due to the combination of the light guide plate and the reflecting member 第2の実施形態に係る照明装置を示す分解斜視図The disassembled perspective view which shows the illuminating device which concerns on 2nd Embodiment. 第2の実施形態に係る照明装置を示す断面図Sectional drawing which shows the illuminating device which concerns on 2nd Embodiment. 図17に示す二点差線で囲んだ部分の拡大断面図FIG. 17 is an enlarged cross-sectional view of a portion surrounded by a two-dot chain line 変形例に係る導光板および反射部材を説明するための断面図Sectional drawing for demonstrating the light-guide plate and reflection member which concern on a modification 従来のエッジライト方式の照明装置を示す平面図Plan view showing a conventional edge light type illumination device 従来の直下型方式の照明装置を示す断面図Sectional view showing a conventional direct lighting system

以下、本発明の一態様に係る照明装置について、図面を参照しながら説明する。なお、各図面における部材の縮尺は実際のものとは異なる。また、本願において、数値範囲を示す際に用いる符号「〜」は、その両端の数値を含む。   Hereinafter, a lighting device according to one embodiment of the present invention will be described with reference to the drawings. In addition, the scale of the member in each drawing differs from an actual thing. In the present application, the sign “˜” used to indicate a numerical range includes numerical values at both ends.

<第1の実施形態>
(全体構成)
図1は、第1の実施形態に係る照明装置の天井板への取り付けの態様を説明する図である。図1に示すように、本発明の一態様に係る照明装置1は、例えば、天井板2に埋め込むようにして取り付けられるダウンライトである。なお、本発明に係る照明装置1は、ダウンライトに限定されず、シーリングライト等のダウンライト以外の建築物用照明装置であっても良いし、バックライト等の建築物用照明装置以外の照明装置であっても良い。
<First Embodiment>
(overall structure)
FIG. 1 is a diagram illustrating an aspect of attachment of the lighting device according to the first embodiment to a ceiling board. As shown in FIG. 1, a lighting device 1 according to an aspect of the present invention is a downlight that is attached so as to be embedded in a ceiling plate 2, for example. The lighting device 1 according to the present invention is not limited to a downlight, and may be a building lighting device other than a downlight such as a ceiling light, or an illumination other than a building lighting device such as a backlight. It may be a device.

照明装置1は、天井板2に設けた貫通孔2aにケース10の一部を嵌め込み、ケース10に取り付けられた板ばね状の掛止部材3を天井板2の天井裏面2bに掛止させることによって、天井板2に取り付けられている。なお、掛止部材3は板ばね状のものに限定されない。また、照明装置1の天井板2への取り付け方法は掛止部材3を用いた掛止によるものに限定されず、ねじ止めや接着等で取り付けられていても良い。   The lighting device 1 is configured such that a part of the case 10 is fitted into a through-hole 2 a provided in the ceiling plate 2, and the leaf spring-like latching member 3 attached to the case 10 is latched to the ceiling back surface 2 b of the ceiling plate 2. Is attached to the ceiling board 2. The latch member 3 is not limited to a leaf spring shape. Moreover, the attachment method to the ceiling board 2 of the illuminating device 1 is not limited to the thing by the latching using the latching member 3, You may attach by screwing or adhesion | attachment.

天井板2の天井裏面2bには、照明装置1を点灯させるための回路ユニット4が配置されており、照明装置1は、電源線23を介して回路ユニット4と電気的に接続されている。回路ユニット4は、外部の商用交流電源(不図示)と電気的に接続されており、商用交流電源から入力される電流を照明装置1に供給する。なお、本実施の形態では、回路ユニット4が照明装置1とは別途に必要であるが、本発明に係る照明装置は回路ユニット4を内蔵した照明装置であっても良い。   A circuit unit 4 for lighting the lighting device 1 is disposed on the ceiling back surface 2 b of the ceiling plate 2, and the lighting device 1 is electrically connected to the circuit unit 4 via a power line 23. The circuit unit 4 is electrically connected to an external commercial AC power supply (not shown), and supplies a current input from the commercial AC power supply to the lighting device 1. In the present embodiment, the circuit unit 4 is required separately from the lighting device 1, but the lighting device according to the present invention may be a lighting device incorporating the circuit unit 4.

図2は、第1の実施形態に係る照明装置を示す斜視図である。図3は、第1の実施形態に係る照明装置を示す分解斜視図である。図4は、第1の実施形態に係る照明装置を示す断面図である。図5は、図4に示す二点差線で囲んだ部分の拡大断面図である。図2〜図5に示すように、照明装置1は、例えば、ケース10、発光モジュール20、反射部材30、導光板40および拡散カバー50等を備える。   FIG. 2 is a perspective view showing the lighting apparatus according to the first embodiment. FIG. 3 is an exploded perspective view showing the illumination device according to the first embodiment. FIG. 4 is a cross-sectional view showing the illumination device according to the first embodiment. FIG. 5 is an enlarged cross-sectional view of a portion surrounded by a two-dot chain line shown in FIG. As shown in FIGS. 2 to 5, the lighting device 1 includes, for example, a case 10, a light emitting module 20, a reflecting member 30, a light guide plate 40, a diffusion cover 50, and the like.

(ケース)
図3に示すように、ケース10は、例えば、アルミダイキャスト製の皿状であって、有底円筒状の本体部11と、当該本体部11の開口部に延設された円環板状の鍔部12とを有する。
(Case)
As shown in FIG. 3, the case 10 is, for example, an aluminum die-cast dish-shaped body having a bottomed cylindrical main body 11 and an annular plate extending from the opening of the main body 11. And the collar portion 12.

本体部11は、円板状の底板部分13と底板部分13の外周縁に延設された円筒状の側壁部分14とを有し、本体部11の内部には、図4に示すように、発光モジュール20、反射部材30および導光板40の一部が収容されている。図3に戻って、本体部11の側壁部分14には、電源線23を挿通させるための貫通孔15が形成されている。   The main body 11 has a disk-shaped bottom plate portion 13 and a cylindrical side wall portion 14 extending to the outer peripheral edge of the bottom plate portion 13. As shown in FIG. The light emitting module 20, the reflecting member 30, and a part of the light guide plate 40 are accommodated. Returning to FIG. 3, a through hole 15 through which the power supply line 23 is inserted is formed in the side wall portion 14 of the main body 11.

鍔部12は、天井板2に当接される円環板状の本体部分16と、当該本体部分16の外周縁に延設されたフランジ部分17とを有し、図4に示すように、フランジ部分17に拡散カバー50の側壁部52を外嵌させた状態で、ケース10と拡散カバー50とが例えば接着等により固定されている。   The flange portion 12 includes an annular plate-like main body portion 16 that is in contact with the ceiling plate 2 and a flange portion 17 that extends to the outer peripheral edge of the main body portion 16, as shown in FIG. In a state where the side wall 52 of the diffusion cover 50 is externally fitted to the flange portion 17, the case 10 and the diffusion cover 50 are fixed by, for example, adhesion.

(発光モジュール)
図3に戻って、発光モジュール20は、円環板状の基板21と、当該基板21の一方の主面である素子搭載面21aに搭載された複数の発光素子22とを有し、導光板40の裏側に配置されている。各発光素子22は、それぞれの主出射方向を導光板40に向けた状態で、基板21の素子搭載面21aに隣合う発光素子間に間隔を設けて円環状に配列されている。
(Light emitting module)
Returning to FIG. 3, the light emitting module 20 includes an annular plate-shaped substrate 21 and a plurality of light emitting elements 22 mounted on an element mounting surface 21 a which is one main surface of the substrate 21, and a light guide plate 40 on the back side. The light emitting elements 22 are arranged in an annular shape with a space between the light emitting elements adjacent to the element mounting surface 21a of the substrate 21 in a state where the main emission direction is directed to the light guide plate 40.

基板21は、例えば、セラミック基板や熱伝導樹脂等からなる絶縁層とアルミ板等からなる金属層との2層構造を有する。基板21には配線パターン(不図示)が形成されており、各発光素子22は前記配線バターンおよびコネクタ24を介して電源線23と電気的に接続されている。基板21の素子搭載面21aは、光を効率良く導光板40側へ反射させるための反射面となっている。   The substrate 21 has, for example, a two-layer structure of an insulating layer made of a ceramic substrate or a heat conductive resin and a metal layer made of an aluminum plate or the like. A wiring pattern (not shown) is formed on the substrate 21, and each light emitting element 22 is electrically connected to the power supply line 23 through the wiring pattern and the connector 24. The element mounting surface 21a of the substrate 21 is a reflecting surface for efficiently reflecting light toward the light guide plate 40 side.

発光素子22は、例えば、LEDであって、基板21の素子搭載面21aにCOB(Chip on Board)技術を用いてフェイスアップ実装されている。なお、本発明に係る発光素子は、例えば、LD(レーザダイオード)や、EL素子(エレクトリックルミネッセンス素子)であっても良い。また、本発明に係る発光素子は、SMD(Surface Mount Device)型のものが基板に搭載されていても良い。   The light emitting element 22 is, for example, an LED, and is mounted face up on the element mounting surface 21a of the substrate 21 using a COB (Chip on Board) technique. The light emitting element according to the present invention may be, for example, an LD (laser diode) or an EL element (electric luminescence element). The light emitting element according to the present invention may be a SMD (Surface Mount Device) type mounted on a substrate.

(反射部材)
反射部材30は、円形板状の内側反射部材30aと、内側反射部材30aの外周を囲むように配置される円環板状の外側反射部材30bとで構成されており、図4に示すように、導光板40の裏側に導光板40に対して近接配置されている。具体的には、内側反射部材30aは、導光板40の環内側部42の裏側に配置されており、外側反射部材30bは、導光板40の環外側部43の裏側に配置されており、反射部材30全体としては、発光素子22を避けるようにして導光板40の裏側に配置されている。言い換えると、反射部材30は、導光版40の裏側の面(裏側の面42bおよび裏側の面43b)と直交する方向から見て、複数の発光素子22からなる環状の素子列が収容された環状の素子収容溝(溝部)60と重ならない領域に配置されている。なお、本願において、照明装置1の照明方向側が表側であって、表側の反対側が裏側である。図2〜図5においては、紙面上側が表側であり、紙面下側が裏側である。
(Reflective member)
The reflection member 30 includes a circular plate-like inner reflection member 30a and an annular plate-like outer reflection member 30b disposed so as to surround the outer periphery of the inner reflection member 30a, as shown in FIG. The light guide plate 40 is disposed close to the light guide plate 40 on the back side. Specifically, the inner reflection member 30a is disposed on the back side of the ring inner side portion 42 of the light guide plate 40, and the outer reflection member 30b is disposed on the back side of the ring outer side portion 43 of the light guide plate 40, and is reflected. The entire member 30 is disposed on the back side of the light guide plate 40 so as to avoid the light emitting element 22. In other words, the reflecting member 30 accommodates an annular element array composed of a plurality of light emitting elements 22 when viewed from the direction orthogonal to the back side surfaces (the back side surface 42b and the back side surface 43b) of the light guide plate 40. It is arranged in a region that does not overlap with the annular element housing groove (groove portion) 60. In addition, in this application, the illumination direction side of the illuminating device 1 is a front side, and the opposite side of a front side is a back side. 2 to 5, the upper side of the paper is the front side, and the lower side of the paper is the back side.

外側反射部材30bの外径はケース10の本体部11の内径と略同じであり、外側反射部材30bを本体部11内に収容するだけで外側反射部材30bの位置決めが完了する。内側反射部材30aおよび外側反射部材30bの材料としては、高反射ポリカーボネート樹脂、高反射ナイロン樹脂、高反射ポリブチレンテレフタレート樹脂、高反射発泡樹脂等の反射率の高い材料が最適である。   The outer diameter of the outer reflecting member 30 b is substantially the same as the inner diameter of the main body 11 of the case 10, and the positioning of the outer reflecting member 30 b is completed only by housing the outer reflecting member 30 b in the main body 11. As materials for the inner reflecting member 30a and the outer reflecting member 30b, materials having high reflectivity such as highly reflective polycarbonate resin, highly reflective nylon resin, highly reflective polybutylene terephthalate resin, and highly reflective foamed resin are optimal.

図5に示すように、内側反射部材30aの表側の面は、第1光反射面31aと第2光反射面32aとで構成されている。第1光反射面31aは、導光板40の環内側部42の裏側の面42bと対向しており、環内側部42から裏側に漏れる光を反射させて環内側部42に戻す役割を果たす。第2光反射面32aは、導光板40の環状部41の第2光散乱部分46の裏側の面46bと対向しており、第2光散乱部分46から裏側に漏れる光を反射させて第2光散乱部分46に戻す役割を果たす。   As shown in FIG. 5, the surface on the front side of the inner reflecting member 30a is composed of a first light reflecting surface 31a and a second light reflecting surface 32a. The first light reflecting surface 31 a faces the back surface 42 b of the ring inner portion 42 of the light guide plate 40 and plays a role of reflecting light leaking from the ring inner portion 42 to the back side and returning it to the ring inner portion 42. The second light reflecting surface 32a faces the surface 46b on the back side of the second light scattering portion 46 of the annular portion 41 of the light guide plate 40, and reflects the light leaking from the second light scattering portion 46 to the back side. It plays the role of returning to the light scattering portion 46.

第1光反射面31aは、環内側部42の裏側の面42bと面接触しており、第2光反射面32aは、第2光散乱部分46の裏側の面46bと面接触している。面接触しているため、効率良く導光板40に光を戻すことができると共に、内側反射部材30aと導光板40との位置決めを高精度で行うことができる。   The first light reflecting surface 31 a is in surface contact with the back surface 42 b of the ring inner portion 42, and the second light reflecting surface 32 a is in surface contact with the back surface 46 b of the second light scattering portion 46. Because of the surface contact, light can be efficiently returned to the light guide plate 40, and positioning of the inner reflection member 30a and the light guide plate 40 can be performed with high accuracy.

なお、本発明に係る照明装置は、必ずしも面接触している必要はなく、第1光反射面31aと環内側部42の裏側の面42bとの間には隙間が空いていても良い。また、第2光反射面32aと第2光散乱部分46の裏側の面46bとの間にも隙間が空いていても良い。   The lighting device according to the present invention is not necessarily in surface contact, and there may be a gap between the first light reflecting surface 31a and the back surface 42b of the ring inner portion 42. Further, a gap may be formed between the second light reflecting surface 32 a and the back surface 46 b of the second light scattering portion 46.

外側反射部材30bの表側の面は、第1光反射面31bと第2光反射面32bとで構成されている。第1光反射面31bは、導光板40の環外側部43の裏側の面43bと対向しており、環外側部43から裏側に漏れる光を反射させて環外側部43に戻す役割を果たす。第2光反射面32bは、導光板40の環状部41の第4光散乱部分48の裏側の面48bと対向しており、第4光散乱部分48から裏側に漏れる光を反射させて第4光散乱部分48に戻す役割を果たす。   The surface on the front side of the outer reflecting member 30b is composed of a first light reflecting surface 31b and a second light reflecting surface 32b. The first light reflecting surface 31 b faces the back surface 43 b of the outer ring portion 43 of the light guide plate 40, and plays a role of reflecting light leaking from the outer ring portion 43 to the back side and returning it to the outer ring portion 43. The second light reflecting surface 32b is opposed to the back surface 48b of the fourth light scattering portion 48 of the annular portion 41 of the light guide plate 40, and reflects the light leaking from the fourth light scattering portion 48 to the back side. It plays the role of returning to the light scattering portion 48.

第1光反射面31bは、環外側部43の裏側の面43bと面接触しており、第2光反射面32bは、第4光散乱部分48の裏側の面48bと面接触している。面接触しているため、効率良く導光板40に光を戻すことができると共に、外側反射部材30bと導光板40との位置決めを高精度で行うことができる。なお、本発明に係る照明装置は、必ずしも面接触している必要はなく、第1光反射面31bと環外側部43の裏側の面43bとの間には隙間が空いていても良い。また、第2光反射面32bと第4光散乱部分48の裏側の面48bとの間にも隙間が空いていても良い。   The first light reflection surface 31 b is in surface contact with the back surface 43 b of the outer ring portion 43, and the second light reflection surface 32 b is in surface contact with the back surface 48 b of the fourth light scattering portion 48. Because of the surface contact, light can be efficiently returned to the light guide plate 40, and the positioning of the outer reflective member 30b and the light guide plate 40 can be performed with high accuracy. The lighting device according to the present invention is not necessarily in surface contact, and there may be a gap between the first light reflecting surface 31 b and the back surface 43 b of the outer ring portion 43. Further, a gap may be formed between the second light reflecting surface 32 b and the back surface 48 b of the fourth light scattering portion 48.

図4に示すように、内側反射部材30aと外側反射部材30bとは、導光板40の裏側において、内側反射部材30aの外周面33aと外側反射部材30bの内周面33bとが間隔を空けて互いに対向した状態で配置されている。これにより、内側反射部材30aおよび外側反射部材30bによって、発光素子22が収容される環状の素子収容溝60が規定されている。導光板40の環状部41の裏側において、内側反射部材30aおよび外側反射部材30bが存在していない部分が素子収容溝60である。   As shown in FIG. 4, the inner reflecting member 30 a and the outer reflecting member 30 b are separated from each other on the back side of the light guide plate 40 by an outer peripheral surface 33 a of the inner reflecting member 30 a and an inner peripheral surface 33 b of the outer reflecting member 30 b. They are arranged facing each other. Thereby, the annular element accommodating groove 60 in which the light emitting element 22 is accommodated is defined by the inner reflecting member 30a and the outer reflecting member 30b. On the back side of the annular portion 41 of the light guide plate 40, a portion where the inner reflecting member 30 a and the outer reflecting member 30 b are not present is the element housing groove 60.

素子収容溝60の内側周面は内側反射部材30aの外周面33aで構成され、素子収容溝60の外側周面は外側反射部材30bの内周面33bで構成され、素子収容溝60の底面は基板21の素子搭載面21aで構成されている。そして、図5に示すように、内側反射部材30aの外周面33aと基板21の素子搭載面21aとがなす角度θ1は鋭角である。また、外側反射部材30bの内周面33bと基板21の素子搭載面21aとがなす角度θ2も鋭角である。そして、内側反射部材30aの外周面33aと外側反射部材30bの内周面33bとは、それぞれ光反射面となっている。   The inner peripheral surface of the element receiving groove 60 is configured by the outer peripheral surface 33a of the inner reflecting member 30a, the outer peripheral surface of the element receiving groove 60 is configured by the inner peripheral surface 33b of the outer reflecting member 30b, and the bottom surface of the element receiving groove 60 is It is composed of an element mounting surface 21 a of the substrate 21. As shown in FIG. 5, the angle θ1 formed by the outer peripheral surface 33a of the inner reflecting member 30a and the element mounting surface 21a of the substrate 21 is an acute angle. Further, the angle θ2 formed by the inner peripheral surface 33b of the outer reflecting member 30b and the element mounting surface 21a of the substrate 21 is also an acute angle. And the outer peripheral surface 33a of the inner side reflection member 30a and the inner peripheral surface 33b of the outer side reflection member 30b are light reflection surfaces, respectively.

図6は、第1の実施形態に係る反射部材を示す平面図であって、(a)は表側から見た図、(b)は裏側から見た図である。図6では、反射部材に対する発光素子の配置位置が二点差線で示されている。また、反射部材30の中心は符号Oで示されている。   6A and 6B are plan views showing the reflecting member according to the first embodiment, wherein FIG. 6A is a view seen from the front side, and FIG. 6B is a view seen from the back side. In FIG. 6, the arrangement position of the light emitting element with respect to the reflecting member is indicated by a two-dot chain line. The center of the reflecting member 30 is indicated by the symbol O.

図6に示すように、素子収容溝60は、発光素子22が存在する部位の溝幅(発光素子22に対応する部位の溝幅)よりも、発光素子22が存在しない部位の溝幅(隣合う発光素子22の間隙に対応する部位の溝幅)の方が広くなっている。ここで、素子収容溝60の溝幅とは、内側反射部材30aの外周面33aと外側反射部材30bの内周面33bとの間の距離であって、反射部材30の径方向における距離である。   As shown in FIG. 6, the element receiving groove 60 has a groove width (adjacent to a portion where the light emitting element 22 is not present) than a groove width where the light emitting element 22 is present (a groove width corresponding to the light emitting element 22). The groove width of the portion corresponding to the gap between the matching light emitting elements 22 is wider. Here, the groove width of the element housing groove 60 is a distance between the outer peripheral surface 33a of the inner reflecting member 30a and the inner peripheral surface 33b of the outer reflecting member 30b, and is a distance in the radial direction of the reflecting member 30. .

素子収容溝60の溝幅について、より詳細に説明すると、図5に示すように、素子収容溝60の溝幅は、表側から裏側へ向けて暫時広くなっている。そして、図6(a)に示すように、素子収容溝60は、表側開口においても、発光素子22が存在する部位の溝幅W1よりも発光素子22が存在しない部位の溝幅W2の方が広くなっており、図6(b)に示すように、裏側開口においても、発光素子22が存在する部位の溝幅W3よりも発光素子22が存在しない部位の溝幅W4の方が広くなっている。   The groove width of the element receiving groove 60 will be described in more detail. As shown in FIG. 5, the groove width of the element receiving groove 60 increases for a while from the front side to the back side. As shown in FIG. 6A, in the element receiving groove 60, the groove width W2 at the portion where the light emitting element 22 does not exist is larger than the groove width W1 at the portion where the light emitting element 22 exists even in the front side opening. As shown in FIG. 6B, the groove width W4 in the portion where the light emitting element 22 does not exist is wider than the groove width W3 in the portion where the light emitting element 22 exists in the back side opening as well. Yes.

(導光板)
図3に示すように、導光板40は、円形板状であって、発光素子22からなる素子列に沿って円環状に形成された環状部41と、環状部41の環内側に環状部41と連続して形成された円板状である環内側部42と、環状部41の環外側に環状部41と連続して形成された円環状である環外側部43とで構成される。それら、環状部41、環内側部42および環外側部43の3つは一体に成形されている。導光板40の材料としては、アクリル樹脂、ポリカーボネート樹脂、ポリスチレン樹脂、ガラス等の導光性の良い材料が最適である。
(Light guide plate)
As shown in FIG. 3, the light guide plate 40 has a circular plate shape, and has an annular portion 41 formed in an annular shape along the element row composed of the light emitting elements 22, and an annular portion 41 inside the annular portion 41. A disc-shaped annular inner portion 42 formed continuously with the annular portion 41, and an annular annular outer portion 43 formed continuously with the annular portion 41 outside the annular portion 41. Three of them, the annular part 41, the ring inner part 42 and the ring outer part 43, are integrally formed. As the material of the light guide plate 40, a material having good light guide properties such as acrylic resin, polycarbonate resin, polystyrene resin, and glass is optimal.

環状部41は、素子列対向部分44、第1光散乱部分45、第2光散乱部分46、第3光散乱部分47、および第4光散乱部分48で構成される。素子列対向部分44は、複数の発光素子22からなる素子列と対向する円環状である。第1光散乱部分45は、素子列対向部分44の環内側に位置し素子列対向部分44に沿った円環状である。第2光散乱部分46は、第1光散乱部分45の環内側に位置し第1光散乱部分45に沿った円環状である。第1光散乱部分45と第2光散乱部分46とで内側反射部分が構成される。第3光散乱部分47は、素子列対向部分44の環外側に位置し素子列対向部分44に沿った円環状である。第4光散乱部分48は、第3光散乱部分47の環外側に位置し第3光散乱部分47に沿った円環状である。第3光散乱部分47と第2光散乱部分48とで外側反射部分が構成されている。   The annular portion 41 includes an element array facing portion 44, a first light scattering portion 45, a second light scattering portion 46, a third light scattering portion 47, and a fourth light scattering portion 48. The element array facing portion 44 has an annular shape facing the element array composed of the plurality of light emitting elements 22. The first light scattering portion 45 is in an annular shape along the element row facing portion 44 located inside the ring of the element row facing portion 44. The second light scattering portion 46 is in an annular shape along the first light scattering portion 45 located inside the ring of the first light scattering portion 45. The first light scattering portion 45 and the second light scattering portion 46 constitute an inner reflection portion. The third light scattering portion 47 has an annular shape that is located outside the element array facing portion 44 and is located along the element array facing portion 44. The fourth light scattering portion 48 has an annular shape along the third light scattering portion 47 located outside the ring of the third light scattering portion 47. The third light scattering portion 47 and the second light scattering portion 48 constitute an outer reflection portion.

図4および図5において、符号W41で示す範囲が環状部41であり、符号W42で示す範囲が環内側部42であり、符号W43で示す範囲が環内側部42である。環外側部43の外周縁部は、ケース10の鍔部12の本体部分16上に載置された状態で、本体部分16と拡散カバー50の外周縁部51aとで挟持されることで位置決めされている。図5において、符号W44で示す範囲が素子列対向部分44であり、符号W45で示す範囲が第1光散乱部分45であり、符号W46で示す範囲が第2光散乱部分46であり、符号W47で示す範囲が第3光散乱部分47であり、符号W48で示す範囲が第4光散乱部分48である。   4 and 5, the range indicated by reference sign W41 is the annular part 41, the range indicated by reference sign W42 is the ring inner part 42, and the range indicated by reference sign W43 is the ring inner part 42. The outer peripheral edge portion of the outer ring portion 43 is positioned by being sandwiched between the main body portion 16 and the outer peripheral edge portion 51 a of the diffusion cover 50 while being placed on the main body portion 16 of the flange portion 12 of the case 10. ing. In FIG. 5, the range indicated by the symbol W44 is the element array facing portion 44, the range indicated by the symbol W45 is the first light scattering portion 45, the range indicated by the symbol W46 is the second light scattering portion 46, and the symbol W47. The range indicated by is the third light scattering portion 47, and the range indicated by the symbol W48 is the fourth light scattering portion.

図5に示すように、導光板40の表側の面は、環状部41の表側の面41aと、環内側部42の表側の面42aと、環外側部43の表側の面43aとで構成される。そして、環状部41の表側の面41aは、素子列対向部分44の表側の面44aと、内側反射部分の表側の面と、外側反射部分の表側の面とで構成される。内側反射部分の表側の面は、反射面であって、第1光散乱部分45の表側の面である第1光散乱領域45aと、第2光散乱部分46の表側の面である第2光散乱領域46aとで構成される。外側反射部分の表側の面も、反射面であって、第3光散乱部分47の表側の面である第3光散乱領域47aと、第4光散乱部分48の表側の面である第4光散乱領域48aとで構成される。   As shown in FIG. 5, the front surface of the light guide plate 40 includes a front surface 41 a of the annular portion 41, a front surface 42 a of the annular inner portion 42, and a front surface 43 a of the annular outer portion 43. The The front side surface 41a of the annular portion 41 includes a front side surface 44a of the element array facing portion 44, a front side surface of the inner reflection portion, and a front side surface of the outer reflection portion. The front-side surface of the inner reflection portion is a reflection surface, and the first light-scattering region 45 a that is the front-side surface of the first light-scattering portion 45 and the second light that is the front-side surface of the second light-scattering portion 46. And a scattering region 46a. The surface on the front side of the outer reflection portion is also a reflection surface, and the third light scattering region 47a that is the surface on the front side of the third light scattering portion 47 and the fourth light that is the surface on the front side of the fourth light scattering portion 48. And a scattering region 48a.

また、導光板40の裏側の面は、環状部41の裏側の面41bと、環内側部42の裏側の面42bと、環外側部43の裏側の面43bとで構成される。そして、環状部41の裏側の面41bは、素子列対向部分44の裏側の面44bと、第1光散乱部分45の裏側の面45bと、第2光散乱部分46の裏側の面46bと、第3光散乱部分47の裏側の面47bと、第4光散乱部分48の裏側の面48bとで構成される。   The back surface of the light guide plate 40 includes a back surface 41 b of the annular portion 41, a back surface 42 b of the annular inner portion 42, and a reverse surface 43 b of the annular outer portion 43. And the back side surface 41b of the annular portion 41 includes a back side surface 44b of the element array facing portion 44, a back side surface 45b of the first light scattering portion 45, a back side surface 46b of the second light scattering portion 46, The back surface 47 b of the third light scattering portion 47 and the back surface 48 b of the fourth light scattering portion 48 are configured.

なお、本発明に係る導光板は、円形板状に限定されず任意である。例えば、四角形板状、六角形板状、八角形板状等のような多角形の板状であっても良い。また、環状部、環内側部、環外側部、素子列対向部分、第1光散乱部分、第2光散乱部分、第3光散乱部分、および第4光散乱部分の各形状も、導光板の形状に応じて任意である。さらに、発光素子の配列や基板の形状も導光板の形状に応じて任意である。   In addition, the light-guide plate which concerns on this invention is not limited to circular plate shape, but is arbitrary. For example, a polygonal plate shape such as a quadrangular plate shape, a hexagonal plate shape, an octagonal plate shape, or the like may be used. In addition, each shape of the annular part, the inner part of the ring, the outer part of the ring, the element array facing part, the first light scattering part, the second light scattering part, the third light scattering part, and the fourth light scattering part is also the light guide plate. It is optional depending on the shape. Furthermore, the arrangement of the light emitting elements and the shape of the substrate are arbitrary depending on the shape of the light guide plate.

環状部41の表側の面41aは、裏側から環状部41に入射した発光素子22の光を、環内側部42或いは環外側部43に向けて反射させるための反射面となっている。図4および図5に示すように、導光板40の縦断面(導光板40の表側の面の中心を通り、且つ、導光板40の表側の面と直交する仮想面で切断した断面)において、環状部41の表側の面41aの形状は、中央が裏側に突出するよう折り返された略V字形である。折り返し部分は、裏側に膨らんだR形状になっている。折り返し部分の両側は、環内側部42および環外側部43に向けて効率良く光を反射させるために、それぞれ表側に膨らんだ略円弧形となっている。   The front surface 41 a of the annular portion 41 is a reflection surface for reflecting the light of the light emitting element 22 incident on the annular portion 41 from the back side toward the annular inner portion 42 or the annular outer portion 43. As shown in FIGS. 4 and 5, in the longitudinal section of the light guide plate 40 (cross section cut through a virtual plane that passes through the center of the front side surface of the light guide plate 40 and is orthogonal to the front side surface of the light guide plate 40). The shape of the surface 41a on the front side of the annular portion 41 is a substantially V-shape folded back so that the center protrudes to the back side. The folded portion has an R shape that swells on the back side. In order to reflect light efficiently toward the inner ring portion 42 and the outer ring portion 43, both sides of the folded portion are each formed in a substantially arc shape that swells to the front side.

環状部41の表側の面41aには、光散乱処理が施されている。具体的には、第1光散乱領域45a、第2光散乱領域46a、第3光散乱領域47a、および第4光散乱領域48aに、光散乱処理として凹部45c,46c,47c,48cが設けられている。光散乱処理が施されているため、環状部41内から表側の面41aに入射した光は、全反射されるのではなく、その一部が凹部45c,46c,47c,48cで散乱されて、導光板40の外部へと出射される。なお、素子列対向部分44の表側の面44aには凹部は設けられていない。   The front surface 41a of the annular portion 41 is subjected to light scattering processing. Specifically, the first light scattering region 45a, the second light scattering region 46a, the third light scattering region 47a, and the fourth light scattering region 48a are provided with recesses 45c, 46c, 47c, and 48c as a light scattering process. ing. Since the light scattering process is performed, the light incident on the front side surface 41a from the inside of the annular portion 41 is not totally reflected, but a part thereof is scattered by the recesses 45c, 46c, 47c, 48c, The light is emitted to the outside of the light guide plate 40. Note that no concave portion is provided on the front surface 44 a of the element array facing portion 44.

本実施の形態において、凹部45c,46c,47c,48cは、形状がそれぞれ略半球状であって、大きさは全て同じである。なお、本発明に係る凹部の形状および大きさ等は任意であり、光散乱効果が得られるものであれば良く、形状としては例えば略円錐状や略円錐台状等であっても良い。   In the present embodiment, the recesses 45c, 46c, 47c, and 48c are substantially hemispherical in shape and all have the same size. Note that the shape and size of the recess according to the present invention are arbitrary, and any shape can be used as long as the light scattering effect can be obtained. The shape may be, for example, a substantially conical shape or a substantially truncated cone shape.

図7は、第1の実施形態に係る導光板を示す平面図であって、(a)は表側から見た図、(b)は裏側から見た図である。図7(a)に示すように、第1光散乱部分45と第2光散乱部分46とを比較すると、第1光散乱領域45aと第2光散乱領域46aとには異なる態様の光散乱処理が施されている。具体的には、第1光散乱領域45aよりも第2光散乱領域46aの方が、凹部45c,46cの単位面積当たりの数が多い。そのため、第1光散乱部分45よりも第2光散乱部分46から、より多くの光が出射される。   7A and 7B are plan views showing the light guide plate according to the first embodiment, where FIG. 7A is a view seen from the front side, and FIG. 7B is a view seen from the back side. As shown in FIG. 7A, when the first light scattering portion 45 and the second light scattering portion 46 are compared, the first light scattering region 45a and the second light scattering region 46a have different modes of light scattering processing. Is given. Specifically, the number of the concave portions 45c and 46c per unit area is larger in the second light scattering region 46a than in the first light scattering region 45a. Therefore, more light is emitted from the second light scattering portion 46 than the first light scattering portion 45.

また、第3光散乱部分47と第4光散乱部分48とを比較すると、第3光散乱領域47aと第4光散乱領域48aとには異なる態様の光散乱処理が施されている。具体的には、第3光散乱領域47aよりも第4光散乱領域48aの方が、凹部47c,48cの単位面積当たりの数が多い。そのため、第3光散乱部分47よりも第4光散乱部分48から、より多くの光が出射される。   Further, when the third light scattering portion 47 and the fourth light scattering portion 48 are compared, the third light scattering region 47a and the fourth light scattering region 48a are subjected to different modes of light scattering processing. Specifically, the number of the concave portions 47c and 48c per unit area is larger in the fourth light scattering region 48a than in the third light scattering region 47a. Therefore, more light is emitted from the fourth light scattering portion 48 than from the third light scattering portion 47.

なお、本実施の形態では、第1光散乱部分45と第3光散乱部分47には同じ態様の光散乱処理が施されており、第2光散乱部分46と第4光散乱部分48にも同じ態様の光散乱処理が施されている。すなわち、第1光散乱領域45aと第3光散乱領域47aとは、凹部45c,47cの単位面積当たりの数が同じである。また、第2光散乱領域46aと第4光散乱領域48aとは、凹部46c,48cの単位面積当たりの数が同じである。   In the present embodiment, the first light scattering portion 45 and the third light scattering portion 47 are subjected to the same light scattering process, and the second light scattering portion 46 and the fourth light scattering portion 48 are also applied. The same mode of light scattering treatment is applied. That is, the first light scattering region 45a and the third light scattering region 47a have the same number of recesses 45c and 47c per unit area. The second light scattering region 46a and the fourth light scattering region 48a have the same number of recesses 46c, 48c per unit area.

図5に戻って、環状部41の裏側の面41bの一部は、発光素子22の光が入射する入射面となっている。素子列対向部分44の裏側の面44bがその入射面に相当する。素子列対向部分44の裏側の面44bは、複数の発光素子22からなる素子列に対向した円環状である。さらに、環状部41の裏側の面41bの全体は、素子収容溝60内において基板21の素子搭載面21aで反射した光が環状部41に入射するための入射面としても機能している。   Returning to FIG. 5, a part of the back surface 41 b of the annular portion 41 is an incident surface on which light of the light emitting element 22 is incident. The back surface 44b of the element array facing portion 44 corresponds to the incident surface. The back surface 44 b of the element array facing portion 44 has an annular shape facing the element array composed of the plurality of light emitting elements 22. Further, the entire surface 41 b on the back side of the annular portion 41 also functions as an incident surface for the light reflected by the element mounting surface 21 a of the substrate 21 to enter the annular portion 41 in the element accommodating groove 60.

環内側部42の表側の面42aは、環内側部42内に入射した光の一部が出射する光出射面となっている。環外側部43の表側の面43aは、環外側部43内に入射した光の一部が出射する光出射面となっている。   The surface 42a on the front side of the ring inner portion 42 is a light emitting surface from which a part of the light incident on the ring inner portion 42 is emitted. The surface 43 a on the front side of the outer ring portion 43 is a light emitting surface from which a part of the light incident on the outer ring portion 43 is emitted.

環内側部42の裏側の面42bには、光散乱処理として凹部42cが設けられている。したがって、環内側部42内で凹部42cに入射した光は散乱光となり、表側の面42aから出射される。凹部42cは、図7(b)に示すように、環内側部42の裏側の面42bの中心に近づくほど単位面積当たりの数が多くなっており、これにより表側の面42aの全体から均一に光が出射されるようになっている。   The back surface 42b of the ring inner portion 42 is provided with a recess 42c as a light scattering process. Therefore, the light incident on the recess 42c in the ring inner portion 42 becomes scattered light and is emitted from the front surface 42a. As shown in FIG. 7B, the number of the concave portions 42c increases per unit area as the distance from the center of the back surface 42b of the ring inner portion 42 increases, so that the entire surface 42a is uniformly distributed. Light is emitted.

環外側部43の裏側の面43bには、光散乱処理として凹部43cが設けられている。したがって、環外側部43内で凹部43cに入射した光は散乱光となり、表側の面43aから出射される。凹部43cは、環外側部43の裏側の面43bの外周縁に近づくほど単位面積当たりの数が多くなっており、これにより表側の面43aの全体から均一に光が出射されるようになっている。一方、図3に示すように、環外側部43の外周面43dには、当該外周面43dから導光板40の外部へ光が漏れないような加工が施されている。環外側部43内を進行し外周面43dに到達した光は、外周面43dで反射されるため、環外側部43から出ることなく戻り光となって環状部41に向かう。   A recess 43c is provided on the back surface 43b of the outer ring portion 43 as a light scattering process. Therefore, the light incident on the concave portion 43c in the outer ring portion 43 becomes scattered light and is emitted from the front surface 43a. The number of the recesses 43c per unit area increases toward the outer peripheral edge of the back surface 43b of the outer ring portion 43, so that light is uniformly emitted from the entire front surface 43a. Yes. On the other hand, as shown in FIG. 3, the outer peripheral surface 43 d of the outer ring portion 43 is processed so that light does not leak from the outer peripheral surface 43 d to the outside of the light guide plate 40. The light that travels in the outer ring portion 43 and reaches the outer peripheral surface 43d is reflected by the outer peripheral surface 43d, and thus returns to the annular portion 41 without returning from the outer ring portion 43.

なお、環内側部42および環外側部43に施される光散乱処理は上記に限定されず任意である。例えば、光散乱処理として凹部ではなく凸部が設けられていても良いし、凹部と凸部の両方が設けられていても良い。また、光散乱処理が裏側の面42b,43bではなく表側の面42a,43aに施されていても良いし、裏側の面42b,43bと表側の面42a,43aの両方に施されていても良い。但し、環内側部42の表側の面42aおよび環外側部43の表側の面43aの全体から、均一に光が出射するような態様であることが好ましい。   In addition, the light scattering process performed on the ring inner part 42 and the ring outer part 43 is not limited to the above and is arbitrary. For example, a convex part instead of the concave part may be provided as the light scattering process, or both the concave part and the convex part may be provided. Further, the light scattering treatment may be performed not on the back surfaces 42b and 43b but on the front surfaces 42a and 43a, or may be performed on both the back surfaces 42b and 43b and the front surfaces 42a and 43a. good. However, it is preferable that light is uniformly emitted from the entire front surface 42 a of the ring inner portion 42 and the entire front surface 43 a of the ring outer portion 43.

(拡散カバー)
拡散カバー50は、例えば、シリコーン樹脂、アクリル樹脂、ポリカーボネート樹脂、ガラス等の透光性材料により形成されており、導光板40から出射された光は拡散カバー50を透過して照明装置1の外部へ取り出される。
拡散カバー50は、導光板40を覆うドーム状の本体部51と、当該本体部51の周縁部から裏側方向へ延設された側壁部52とを有し、当該側壁部52がケース10の鍔部12のフランジ部分17に固定されている。本体部51には光散乱処理が施されており、導光板40から出射された光は本体部51を透過する際に散乱光となる。したがって、より輝度むらがより一層軽減される。なお、本発明に係る照明装置には拡散カバーは必須ではない。
(Diffusion cover)
The diffusion cover 50 is formed of a light-transmitting material such as silicone resin, acrylic resin, polycarbonate resin, or glass, for example, and light emitted from the light guide plate 40 passes through the diffusion cover 50 and is external to the lighting device 1. Is taken out.
The diffusion cover 50 includes a dome-shaped main body 51 that covers the light guide plate 40, and a side wall 52 that extends from the peripheral edge of the main body 51 toward the back side. It is fixed to the flange portion 17 of the portion 12. The main body 51 is subjected to a light scattering process, and light emitted from the light guide plate 40 becomes scattered light when passing through the main body 51. Therefore, the luminance unevenness is further reduced. Note that the diffusion cover is not essential for the lighting device according to the present invention.

(反射部材による輝度むら軽減効果)
図8は、従来の照明装置で生じる輝度むらを説明するための図であって、点灯状態の照明装置を撮影した写真と、それに基づく輝度むらの分析結果を示している。図9は、従来の照明装置で生じる輝度むらを説明するための模式図であって、図8に示す輝度むらを模式的に表したものである。なお、図8は拡散カバー越しの輝度むらを表しているが、図9は導光板の表側の面の輝度むらを表している。
(Brightness unevenness reduction effect by reflecting member)
FIG. 8 is a diagram for explaining luminance unevenness generated in a conventional lighting device, and shows a photograph of a lighting device in a lighting state and an analysis result of luminance unevenness based on the photograph. FIG. 9 is a schematic diagram for explaining the luminance unevenness generated in the conventional lighting device, and schematically shows the luminance unevenness shown in FIG. FIG. 8 shows luminance unevenness over the diffusion cover, while FIG. 9 shows luminance unevenness on the front surface of the light guide plate.

従来の直下型方式の照明装置では、例えば図8に示すような輝度むらが生じていた。図9に示すように、発光素子22が存在しない部分62は、発光素子22が存在する部分61と比較すると影の領域となっており、これが輝度むらの原因の1つとなっている。このような輝度むらを軽減させるために、本実施の形態では、発光素子22が存在する部分61は素子収容溝60の溝幅が狭く、発光素子22が存在しない部分62は素子収容溝60の溝幅が広くなっている。   In a conventional direct type illumination device, for example, uneven brightness as shown in FIG. 8 occurs. As shown in FIG. 9, the portion 62 where the light emitting element 22 does not exist is a shadow region as compared with the portion 61 where the light emitting element 22 exists, and this is one of the causes of luminance unevenness. In order to reduce such luminance unevenness, in this embodiment, the portion 61 where the light emitting element 22 is present has a narrow groove width of the element accommodating groove 60, and the portion 62 where the light emitting element 22 does not exist is the element accommodating groove 60. Groove width is wide.

図10は、基板の素子搭載面で反射した光の経路を説明するための模式図であって、発光し22が存在しない部分の縦断面を示しており、発光素子22が存在する部分については二点鎖線で示している。L1およびL2は、環外側部43の外周面43dで反射して素子収容溝60内に戻ってきた戻り光である。また、L3およびL4は、発光素子22から出射されたものの、入射面(素子列対向部分44の裏側の面44b)に入射しなかった光である。   FIG. 10 is a schematic diagram for explaining the path of light reflected by the element mounting surface of the substrate, showing a longitudinal section of a portion where light is emitted and 22 is not present, and for the portion where the light emitting element 22 is present. It is indicated by a two-dot chain line. L <b> 1 and L <b> 2 are return lights that are reflected by the outer peripheral surface 43 d of the outer ring portion 43 and returned into the element housing groove 60. L3 and L4 are light emitted from the light emitting element 22 but not incident on the incident surface (the surface 44b on the back side of the element array facing portion 44).

図10に示すように、発光素子22が存在しない部分では、素子収容溝60の溝幅、すなわち内側反射部材30aの外周面33aと外側反射部材30bの内周面33bとの間隔が広い。そのため、環状部41の裏側の面41bについては、反射部材30で覆われていない領域の面積が広く、素子収容溝60内から環状部41内へ光が入射し易い。したがって、環状部41の表側の面41aから外部へ出射される光の量は多い。具体的には、L1〜L4の全ての光が外部へ出射される。   As shown in FIG. 10, in the portion where the light emitting element 22 does not exist, the groove width of the element housing groove 60, that is, the interval between the outer peripheral surface 33a of the inner reflective member 30a and the inner peripheral surface 33b of the outer reflective member 30b is wide. Therefore, the surface 41 b on the back side of the annular portion 41 has a large area not covered with the reflecting member 30, and light is likely to enter the annular portion 41 from the element housing groove 60. Accordingly, the amount of light emitted from the front surface 41a of the annular portion 41 to the outside is large. Specifically, all the lights L1 to L4 are emitted to the outside.

一方、二点差線で示すように、発光素子22が存在する部分では、素子収容溝60の溝幅、すなわち内側反射部材30aの外周面33aと外側反射部材30bの内周面33bとの間隔が狭い。そのため、環状部41の裏側の面41bについては、反射部材30で覆われていない領域の面積が狭く、素子収容溝60内から環状部41内へ光が入射し難い。したがって、環状部41の表側の面41aから外部へ出射される光の量は少ない。具体的には、L1とL3の光は外部へ出射されるが、L2とL4の光は反射部材30に阻まれて外部へ出射されず、素子収容溝60内の他の領域、例えば発光素子22が存在しない部分62へと向かう。   On the other hand, as indicated by the two-dot chain line, in the portion where the light emitting element 22 is present, the groove width of the element housing groove 60, that is, the distance between the outer peripheral surface 33a of the inner reflecting member 30a and the inner peripheral surface 33b of the outer reflecting member 30b. narrow. Therefore, the surface 41b on the back side of the annular portion 41 has a small area that is not covered with the reflecting member 30, and it is difficult for light to enter the annular portion 41 from the element housing groove 60. Accordingly, the amount of light emitted from the front surface 41a of the annular portion 41 to the outside is small. Specifically, the light of L1 and L3 is emitted to the outside, but the light of L2 and L4 is blocked by the reflecting member 30 and is not emitted to the outside. It heads for the part 62 where 22 does not exist.

図11は、反射部材による輝度むら低減効果を説明するための模式図であって、導光板40の環状部41に光散乱処理を施したことによる輝度むら低減効果を無視して輝度を表現している。図11に示すように、本実施の形態では、発光素子22が存在していない部分62において、素子収容溝60の溝幅が相対的に広がっている。そのため、発光素子22が存在していない部分62は、発光素子22が存在している部分61と比べて、光が出射し易くなっている。これにより、発光素子22が存在していない部分62の輝度が高くなっているため、輝度むらが軽減されている。   FIG. 11 is a schematic diagram for explaining the effect of reducing the uneven brightness by the reflecting member, and expresses the brightness by ignoring the effect of reducing the uneven brightness due to the light scattering process performed on the annular portion 41 of the light guide plate 40. ing. As shown in FIG. 11, in the present embodiment, the groove width of the element receiving groove 60 is relatively wide in the portion 62 where the light emitting element 22 does not exist. Therefore, the portion 62 where the light emitting element 22 does not exist is easier to emit light than the portion 61 where the light emitting element 22 exists. Thereby, since the luminance of the portion 62 where the light emitting element 22 does not exist is high, the luminance unevenness is reduced.

さらに、本実施の形態では、素子収容溝60を構成している内側反射部材30aの外周面33aと、外側反射部材30bの内周面33bと、基板21の素子搭載面21aとが、それぞれ光反射面となっているため、素子収容溝60内の光が素子搭載面21aで反射して効率良く環状部41に入射するようになっている。したがって、素子収容溝60内の光がより環状部41から出射され易く、環状部41に影の領域が生じ難くなっている。   Furthermore, in the present embodiment, the outer peripheral surface 33a of the inner reflecting member 30a, the inner peripheral surface 33b of the outer reflecting member 30b, and the element mounting surface 21a of the substrate 21 that constitute the element housing groove 60 are respectively light-transmitting. Since it is a reflecting surface, the light in the element receiving groove 60 is reflected by the element mounting surface 21a and efficiently enters the annular portion 41. Therefore, the light in the element housing groove 60 is more easily emitted from the annular portion 41, and a shadow area is less likely to occur in the annular portion 41.

加えて、本実施の形態では、内側反射部材30aの外周面33aと基板21の素子搭載面21aとがなす角度θ1が鋭角であり、外側反射部材30bの内周面33bと基板21の素子搭載面21aとがなす角度θ2も鋭角である。そのため、素子収容溝60内の光がより素子搭載面21aに集まり易くなっており、素子搭載面21aで反射されて環状部41の裏側の面41aに入射し易い。したがって、素子収容溝60内の光がより環状部41から出射され易く、環状部41に影の領域が生じ難くなっている。なお、素子収容溝60内の光がより素子搭載面21aに集まり易くするためには、角度θ1および角度θ2は、90°以下であることが好ましく、45°〜75°であることがより好ましい。   In addition, in the present embodiment, the angle θ1 formed by the outer peripheral surface 33a of the inner reflecting member 30a and the element mounting surface 21a of the substrate 21 is an acute angle, and the inner peripheral surface 33b of the outer reflecting member 30b and the element mounting of the substrate 21 are The angle θ2 formed by the surface 21a is also an acute angle. Therefore, the light in the element housing groove 60 is more likely to gather on the element mounting surface 21 a, and is easily reflected on the element mounting surface 21 a and incident on the back surface 41 a of the annular portion 41. Therefore, the light in the element housing groove 60 is more easily emitted from the annular portion 41, and a shadow area is less likely to occur in the annular portion 41. In order to make it easier for light in the element housing groove 60 to gather on the element mounting surface 21a, the angle θ1 and the angle θ2 are preferably 90 ° or less, and more preferably 45 ° to 75 °. .

(導光板による輝度むら軽減効果)
従来の直下型方式の照明装置では、環状部において、発光素子と対向する素子列対向部分からは光が出射されるが、前記素子列対向部分以外の部分からは殆ど光が出射されないため、例えば図8に示すように影の領域が生じていた。しかも、影の領域は、素子対向部分から遠ざかるほど輝度が低くなっていた。具体的には、図9に示すように、発光素子22に近い部分63は輝度が高いが、発光素子22から遠い部分64は輝度が低くなっており、この輝度差が輝度むらの原因の1つとなっている。このような輝度むらを軽減させるために、本実施の形態では、環状部41に光散乱処理が施されている。しかも、その光散乱処理は、第1光散乱部分45よりも第2光散乱部分46から多くの光が出射され、第3光散乱部分47よりも第4光散乱部分48から多くの光が出射されるように施されている。
(Lightness unevenness reduction effect by light guide plate)
In the conventional direct type illumination device, in the annular portion, light is emitted from the element row facing portion facing the light emitting element, but almost no light is emitted from the portion other than the element row facing portion. As shown in FIG. 8, there was a shadow area. Moreover, the brightness of the shadow area decreases as the distance from the element facing portion increases. Specifically, as shown in FIG. 9, the portion 63 close to the light emitting element 22 has high luminance, but the portion 64 far from the light emitting element 22 has low luminance, and this luminance difference is one of the causes of luminance unevenness. It has become one. In order to reduce such luminance unevenness, the annular portion 41 is subjected to light scattering processing in the present embodiment. Moreover, in the light scattering process, more light is emitted from the second light scattering portion 46 than the first light scattering portion 45, and more light is emitted from the fourth light scattering portion 48 than the third light scattering portion 47. It is given to be done.

図12は、発光素子から直接導光板内に入射した光の経路を説明するための模式図である。図12においてL5で示すように、素子列対向部分44の裏側の面44bから入射した光は、例えば、環状部41の表側の面41aで反射されて、環内側部42内に導かれ、環内側部42の表側の面42aおよび裏側の面42b間で反射を繰り返しながら、環内側部42内を進行する。或いは、L6で示すように、環状部41の表側の面41aで反射されて、環外側部43内に導かれ、環外側部43の表側の面43aおよび裏側の面43b間で反射を繰り返しながら、環外側部43内を進行する。   FIG. 12 is a schematic diagram for explaining a path of light incident directly from the light emitting element into the light guide plate. As indicated by L5 in FIG. 12, the light incident from the back surface 44b of the element array facing portion 44 is reflected by, for example, the front surface 41a of the annular portion 41 and guided into the annular inner portion 42, The inside of the ring inner portion 42 proceeds while repeating reflection between the front side surface 42 a and the back side surface 42 b of the inner side portion 42. Alternatively, as indicated by L6, the light is reflected by the front surface 41a of the annular portion 41, guided into the outer ring portion 43, and repeatedly reflected between the front surface 43a and the rear surface 43b of the outer ring portion 43. , Travels in the outer ring portion 43.

L5およびL6の光は、いずれは凹部42c,43cに入射して散乱光となり、表側の面42a,43aから出射される。例えばL6の光のように、表側の面43aから出射される。なお、L5の光も、環内側部42内を進行するうちに、いずれは凹部42cに入射して散乱光となり表側の面42aから出射される。   The light of L5 and L6 is incident on the recesses 42c and 43c and becomes scattered light, and is emitted from the front surfaces 42a and 43a. For example, like the light of L6, it is radiate | emitted from the surface 43a of the front side. In addition, as the light of L5 travels in the ring inner portion 42, any of the light enters the concave portion 42c and becomes scattered light and is emitted from the front surface 42a.

このように、環状部41の表側の面41aは、基本的には、環状部41に入射した光を反射させて環内側部42または環外側部43に導くための反射面となっている。そのために、環状部41からは光が出射し難く、環状部41に影の領域が生じ易い。しかしながら、本実施の形態では、環状部41の表側の面41aに凹部45c,46c,47c,48cが設けられているため、L7およびL8で示すように、環状部41の表側の面41aからも光が出射される。そのため、環状部41に影の領域が生じ難い。   Thus, the surface 41 a on the front side of the annular portion 41 is basically a reflective surface for reflecting the light incident on the annular portion 41 and guiding it to the annular inner portion 42 or the annular outer portion 43. Therefore, it is difficult for light to be emitted from the annular portion 41, and a shadow region is likely to be generated in the annular portion 41. However, in the present embodiment, since the concave portions 45c, 46c, 47c, and 48c are provided on the front surface 41a of the annular portion 41, the front surface 41a of the annular portion 41 is also provided as indicated by L7 and L8. Light is emitted. Therefore, it is difficult for a shadow area to occur in the annular portion 41.

しかも、出射され易さは、環状部41の表側の面41aにおいて全ての領域で同じではない。すなわち、第2光散乱領域46aおよび第4光散乱領域48aからは、比較的出射され易く、第1光散乱領域45aおよび第3光散乱領域47aからは、比較的出射され難い。これは、設けられている凹部45c,46c,47c,48cの単位面積当たりの数が異なるからである。   In addition, the easiness of emission is not the same in all regions on the front surface 41 a of the annular portion 41. That is, it is relatively easy to emit from the second light scattering region 46a and the fourth light scattering region 48a, and relatively difficult to emit from the first light scattering region 45a and the third light scattering region 47a. This is because the number of the recessed portions 45c, 46c, 47c, 48c provided per unit area is different.

なお、素子列対向部分44の表側の面44aには、上述したようにR形状の折り返し部分が存在するが、その折り返し部分では、L9で示すように、光はそのまま導光板40を通過して外部へ出射される。したがって、素子列対向部分44の表側の面44a、および、その近傍には凹部を設ける必要がなく、凹部を設けると却ってその部分が明るく目立ち過ぎるおそれがある。凹部を設けない領域は、縦断面において発光素子22の幅の2倍〜3倍であることが好ましい。2倍未満であると明るく目立ち過ぎ、3倍を超えると暗くなり過ぎる。また、折り返し部分のRは、5/100以下であることが好ましく、2/100以下であることがより好ましい。Rが5/100を超えると明るい部分が目立ち過ぎる。   The surface 44a on the front side of the element array facing portion 44 has an R-shaped folded portion as described above. In the folded portion, light passes through the light guide plate 40 as it is, as indicated by L9. It is emitted to the outside. Therefore, it is not necessary to provide a concave portion on the surface 44a on the front side of the element array facing portion 44 and in the vicinity thereof. If the concave portion is provided, the portion may be too bright and conspicuous. The region where no recess is provided is preferably 2 to 3 times the width of the light emitting element 22 in the longitudinal section. If it is less than 2 times, it will be too bright and noticeable. If it is more than 3 times, it will be too dark. Further, R of the folded portion is preferably 5/100 or less, and more preferably 2/100 or less. When R exceeds 5/100, the bright part is too conspicuous.

図13は、導光板による輝度むら低減効果を説明するための模式図であって、反射部材30による輝度むら低減効果を無視して輝度を表現している。図13に示すように、本実施の形態では、環状部41の表側の面41aに光散乱処理が施されているため、環状部41からも光が出射する。したがって、環状部41における輝度が従来の照明装置よりも相対的に高くなっており、輝度むらが軽減されている。   FIG. 13 is a schematic diagram for explaining the luminance unevenness reduction effect by the light guide plate, and expresses the luminance ignoring the luminance unevenness reduction effect by the reflecting member 30. As shown in FIG. 13, in the present embodiment, since the front side surface 41 a of the annular portion 41 is subjected to light scattering processing, light is also emitted from the annular portion 41. Therefore, the luminance in the annular portion 41 is relatively higher than that of the conventional lighting device, and the luminance unevenness is reduced.

しかも、素子列対向部分44に近い第1光散乱部分45および第3光散乱部分47よりも、素子列対向部分44に遠い第2光散乱部分46および第4光散乱部分48からより多くの光が出射されるため、発光素子22に近い部分63と遠い部分64との輝度差が解消されており、輝度むらが軽減されている。
(反射部材および導光板による相乗的な輝度むら軽減効果)
図14は、導光板と反射部材との組み合わせによる輝度むら低減効果を説明するための図であって、点灯状態の照明装置を撮影した写真と、それに基づく輝度むらの分析結果を示している。である。図15は、導光板と反射部材との組み合わせによる輝度むら低減効果を説明するための模式図であって、図14に示す輝度むらを模式的に表したものである。なお、図14は拡散カバー越しの輝度むらを表しているが、図15は導光板の表側の面の輝度むらを表している。
In addition, more light is emitted from the second light scattering portion 46 and the fourth light scattering portion 48 that are farther from the element row facing portion 44 than the first light scattering portion 45 and the third light scattering portion 47 that are closer to the element row facing portion 44. Is emitted, the luminance difference between the portion 63 close to the light emitting element 22 and the portion 64 far from the light emitting element 22 is eliminated, and the luminance unevenness is reduced.
(Synergistic luminance unevenness reduction effect by reflecting member and light guide plate)
FIG. 14 is a diagram for explaining the effect of reducing luminance unevenness due to the combination of the light guide plate and the reflecting member, and shows a photograph of the lighting device in the lighting state and the analysis result of the luminance unevenness based thereon. It is. FIG. 15 is a schematic diagram for explaining the effect of reducing luminance unevenness due to the combination of the light guide plate and the reflecting member, and schematically shows the luminance unevenness shown in FIG. FIG. 14 shows the luminance unevenness over the diffusion cover, while FIG. 15 shows the luminance unevenness on the front surface of the light guide plate.

本実施の形態に係る照明装置1は、反射部材30と導光板40とが組み合わされて使用されているため、反射部材による輝度むら軽減効果と、導光板による輝度むら軽減効果との両方の効果を奏する。したがって、図14および図15に示すような輝度むらの殆どない照明装置1となっている。   Since lighting device 1 according to the present embodiment is used in combination with reflecting member 30 and light guide plate 40, both the luminance unevenness reducing effect by the reflecting member and the luminance unevenness reducing effect by the light guide plate are both effects. Play. Therefore, the lighting apparatus 1 has almost no luminance unevenness as shown in FIGS.

なお、本発明に係る照明装置は、少なくとも反射部材による輝度むら軽減効果が得られるように反射部材に関する構成を備えていれば良く、導光板に関する構成については任意である。したがって、導光板については、従来の構成が採用されていても構わない。   In addition, the illuminating device which concerns on this invention should just be equipped with the structure regarding a reflecting member so that the brightness nonuniformity reduction effect by a reflecting member can be acquired at least, and the structure regarding a light-guide plate is arbitrary. Therefore, a conventional configuration may be adopted for the light guide plate.

<第2の実施形態>
図16は、第2の実施形態に係る照明装置を示す分解斜視図である。図17は、第2の実施形態に係る照明装置を示す断面図である。図18は、図17に示す二点差線で囲んだ部分の拡大断面図である。
<Second Embodiment>
FIG. 16 is an exploded perspective view showing the lighting apparatus according to the second embodiment. FIG. 17 is a cross-sectional view illustrating the lighting apparatus according to the second embodiment. 18 is an enlarged cross-sectional view of a portion surrounded by a two-dot chain line shown in FIG.

第2の実施形態に係る照明装置100は、反射部材30が内側反射部材30aだけで構成されており、導光板140が環外側部を備えていない点において第1の実施の形態に係る照明装置1と大きく異なる。第1の実施の形態に係る照明装置1と同様の点も多いので、両者の相違点についてのみ説明し、共通する構成については同じ符号を使って説明を省略する。   The illuminating device 100 according to the second embodiment is the illuminating device according to the first embodiment in that the reflecting member 30 is configured only by the inner reflecting member 30a and the light guide plate 140 does not include the outer ring portion. Very different from 1. Since there are many points similar to those of the lighting device 1 according to the first embodiment, only the differences between the two will be described, and the same reference numerals are used for the common configurations, and description thereof is omitted.

図16〜図18に示すように、照明装置1は、例えば、ケース110、発光モジュール120、内側反射部材30a、導光板140および拡散カバー150等を備える。   As shown in FIGS. 16-18, the illuminating device 1 is provided with the case 110, the light emitting module 120, the inner side reflection member 30a, the light-guide plate 140, the diffusion cover 150, etc., for example.

(ケース)
図16に示すように、ケース110は、例えば、アルミダイキャスト製の皿状であって、有底円筒状の本体部111を有し、本体部111は、円板状の底板部分113と底板部分113の外周縁に延設された円筒状の側壁部分114とを有する。本体部111の内部には、図17に示すように、発光モジュール120、内側反射部材30aおよび導光板140の一部が収容されている。図16に戻って、本体部111の側壁部分114には、電源線23を挿通させるための貫通孔115が形成されている。
(Case)
As shown in FIG. 16, the case 110 is, for example, an aluminum die-cast dish-shaped body having a bottomed cylindrical main body 111, and the main body 111 includes a disk-shaped bottom plate portion 113 and a bottom plate. And a cylindrical side wall portion 114 extending to the outer peripheral edge of the portion 113. As shown in FIG. 17, the light emitting module 120, the inner reflecting member 30 a, and a part of the light guide plate 140 are accommodated in the main body 111. Returning to FIG. 16, a through hole 115 through which the power supply line 23 is inserted is formed in the side wall portion 114 of the main body 111.

(発光モジュール)
発光モジュール120は、円環板状の基板121と、当該基板121の一方の主面である素子搭載面121aに搭載された複数の発光素子22とを有し、導光板140の裏側に配置されている。各発光素子22は、それぞれの主出射方向を導光板140に向けた状態で、基板121の素子搭載面121aに隣合う発光素子間に間隔を設けて円環状に配列されている。基板121は、第1の実施形態に係る基板21と比較して外形が小さい点を除いて略同様である。各発光素子22は、基板121に形成された配線バターン(不図示)およびコネクタ24を介して電源線23と電気的に接続されている。基板121の素子搭載面121aは、光を効率良く導光板140側へ反射させるための反射面となっている。
(Light emitting module)
The light emitting module 120 includes an annular plate-like substrate 121 and a plurality of light emitting elements 22 mounted on the element mounting surface 121a which is one main surface of the substrate 121, and is disposed on the back side of the light guide plate 140. ing. The light emitting elements 22 are arranged in an annular shape with a space between the light emitting elements adjacent to the element mounting surface 121a of the substrate 121 in a state where the main emission direction is directed to the light guide plate 140. The substrate 121 is substantially the same except that the outer shape is smaller than that of the substrate 21 according to the first embodiment. Each light emitting element 22 is electrically connected to the power supply line 23 through a wiring pattern (not shown) formed on the substrate 121 and a connector 24. The element mounting surface 121a of the substrate 121 is a reflecting surface for efficiently reflecting light toward the light guide plate 140 side.

(反射部材)
反射部材は、第1の実施形態に係る内側反射部材30aだけで構成されており、図17に示すように、導光板140の裏側に導光板140に対して近接配置されている。具体的には、導光板140の環内側部142の裏側に、発光素子22を避けるようにして配置されている。言い換えると、内側反射部材30aは、導光版140の裏側の面(裏側の面142b)と直交する方向から見て、複数の発光素子22からなる環状の素子列が収容された環状の素子収容溝(溝部)160と重ならない領域に配置されている。
(Reflective member)
The reflection member is configured only by the inner reflection member 30a according to the first embodiment, and is disposed in proximity to the light guide plate 140 on the back side of the light guide plate 140 as shown in FIG. Specifically, it is arranged on the back side of the ring inner portion 142 of the light guide plate 140 so as to avoid the light emitting element 22. In other words, the inner reflection member 30a is an annular element housing in which an annular element array composed of a plurality of light emitting elements 22 is accommodated when viewed from a direction orthogonal to the back surface (back surface 142b) of the light guide plate 140. It is arranged in a region that does not overlap with the groove (groove portion) 160.

図18に示すように、内側反射部材30aの第1光反射面31aは、導光板140の環内側部142の裏側の面142bと対向しており、環内側部142から裏側に漏れる光を反射させて環内側部142に戻す役割を果たす。第2光反射面32aは、導光板140の環状部141の第2光散乱部分146の裏側の面146bと対向しており、第2光散乱部分146から裏側に漏れる光を反射させて第2光散乱部分146に戻す役割を果たす。第1光反射面31aは、環内側部142の裏側の面142bと面接触しており、第2光反射面32aは、第2光散乱部分146の裏側の面146bと面接触している。   As shown in FIG. 18, the first light reflecting surface 31 a of the inner reflecting member 30 a faces the back surface 142 b of the ring inner portion 142 of the light guide plate 140, and reflects light leaking from the ring inner portion 142 to the back side. It plays a role of returning to the inner ring portion 142. The second light reflecting surface 32a faces the surface 146b on the back side of the second light scattering portion 146 of the annular portion 141 of the light guide plate 140, and reflects the light leaking from the second light scattering portion 146 to the back side. It plays the role of returning to the light scattering portion 146. The first light reflecting surface 31 a is in surface contact with the back surface 142 b of the ring inner portion 142, and the second light reflecting surface 32 a is in surface contact with the back surface 146 b of the second light scattering portion 146.

内側反射部材30aとケース110とは、導光板140の裏側において、内側反射部材30aの外周面33aとケース110の本体部111の側壁部分114の一部とが間隔を空けて互いに対向した状態で配置されている。これにより、内側反射部材30aおよびケース110によって、発光素子22が収容される環状の素子収容溝160が規定されている。導光板140の環状部141の裏側において、内側反射部材30aが存在していない部分が素子収容溝160である。   The inner reflecting member 30a and the case 110 are in a state where the outer peripheral surface 33a of the inner reflecting member 30a and a part of the side wall portion 114 of the main body 111 of the case 110 face each other with a gap on the back side of the light guide plate 140. Is arranged. Accordingly, an annular element housing groove 160 in which the light emitting element 22 is housed is defined by the inner reflecting member 30 a and the case 110. On the back side of the annular portion 141 of the light guide plate 140, a portion where the inner reflection member 30 a does not exist is the element housing groove 160.

素子収容溝160の内側周面は内側反射部材30aの外周面33aで構成され、素子収容溝60の外側周面はケース110の側壁部分114の内周面で構成され、素子収容溝160の底面は基板121の素子搭載面121aで構成されている。また、内側反射部材30aの外周面33aと基板121の素子搭載面121aとがなす角度θ1は鋭角である。また、素子収容溝160の溝幅は、表側から裏側へ向けて暫時広くなっている。なお、ケース110の側壁部分114の内周面は反射面となっている。   The inner peripheral surface of the element receiving groove 160 is configured by the outer peripheral surface 33a of the inner reflecting member 30a, the outer peripheral surface of the element receiving groove 60 is configured by the inner peripheral surface of the side wall portion 114 of the case 110, and the bottom surface of the element receiving groove 160 Is constituted by an element mounting surface 121 a of the substrate 121. Further, the angle θ1 formed by the outer peripheral surface 33a of the inner reflecting member 30a and the element mounting surface 121a of the substrate 121 is an acute angle. Further, the groove width of the element receiving groove 160 is increased for a while from the front side to the back side. The inner peripheral surface of the side wall portion 114 of the case 110 is a reflecting surface.

(導光板)
図16に示すように、導光板140は、円形板状であって、発光素子22からなる素子列に沿って円環状に形成された環状部141と、環状部141に外周を囲まれた円板状である環内側部142とで構成される。それら、環状部141および環内側部142は一体に成形されている。
(Light guide plate)
As shown in FIG. 16, the light guide plate 140 has a circular plate shape, an annular portion 141 formed in an annular shape along the element row composed of the light emitting elements 22, and a circle surrounded by the annular portion 141. It is comprised by the ring inner side part 142 which is plate shape. The annular portion 141 and the inner ring portion 142 are integrally formed.

環状部141は、素子列対向部分144と、第1光散乱部分145と、第2光散乱部分146とで構成される。第1光散乱部分145と第2光散乱部分146とで内側反射部分が構成される。素子列対向部分144は、複数の発光素子22からなる素子列と対向する円環状である。第1光散乱部分145は、素子列対向部分144の環内側に位置し素子列対向部分144に沿った円環状である。第2光散乱部分146は、第1光散乱部分145の環内側に位置し第1光散乱部分145に沿った円環状である。   The annular portion 141 includes an element row facing portion 144, a first light scattering portion 145, and a second light scattering portion 146. The first light scattering portion 145 and the second light scattering portion 146 constitute an inner reflection portion. The element row facing portion 144 has an annular shape facing the element row composed of the plurality of light emitting elements 22. The first light scattering portion 145 has an annular shape along the element row facing portion 144 that is located inside the ring of the element row facing portion 144. The second light scattering portion 146 has an annular shape that is located inside the ring of the first light scattering portion 145 and extends along the first light scattering portion 145.

図17において、符号W141で示す範囲が環状部141であり、符号W142で示す範囲が環内側部142である。図18において、符号W144で示す範囲が素子列対向部分144であり、符号W145で示す範囲が第1光散乱部分145であり、符号W146で示す範囲が第2光散乱部分146である。   In FIG. 17, the range indicated by reference sign W <b> 141 is the annular portion 141, and the range indicated by reference sign W <b> 142 is the ring inner side portion 142. In FIG. 18, the range indicated by the symbol W144 is the element array facing portion 144, the range indicated by the symbol W145 is the first light scattering portion 145, and the range indicated by the symbol W146 is the second light scattering portion 146.

なお、本発明に係る導光板は、円形板状に限定されず任意である。例えば、四角形板状、六角形板状、八角形板状等のような多角形の板状であっても良い。また、環状部、環内側部、環外側部、素子列対向部分、第1光散乱部分、第2光散乱部分、第3光散乱部分、および第4光散乱部分の各形状も、導光板の形状に応じて任意である。さらに、発光素子の配列や基板の形状も導光板の形状に応じて任意である。   In addition, the light-guide plate which concerns on this invention is not limited to circular plate shape, but is arbitrary. For example, a polygonal plate shape such as a quadrangular plate shape, a hexagonal plate shape, an octagonal plate shape, or the like may be used. In addition, each shape of the annular part, the inner part of the ring, the outer part of the ring, the element array facing part, the first light scattering part, the second light scattering part, the third light scattering part, and the fourth light scattering part is also the light guide plate. It is optional depending on the shape. Furthermore, the arrangement of the light emitting elements and the shape of the substrate are arbitrary depending on the shape of the light guide plate.

環状部141の表側の面141aは、裏側から環状部141に入射した発光素子22の光を、環内側部142に反射させるための反射面となっている。導光板140の縦断面において、環状部141の表側の面141aの形状は、表側に膨らんだ略円弧形となっている。   The front surface 141 a of the annular portion 141 is a reflecting surface for reflecting the light of the light emitting element 22 incident on the annular portion 141 from the back side to the annular inner portion 142. In the longitudinal section of the light guide plate 140, the shape of the surface 141a on the front side of the annular portion 141 is a substantially arc shape that swells to the front side.

環状部141の表側の面141aには、光散乱処理が施されている。具体的には、内側反射部分の表側の面を構成する第1光散乱部分145の表側の面および第2光散乱部分146の表側の面、すなわち第1光散乱領域145aおよび第2光散乱領域146aに、光散乱処理として凹部145c,146cが設けられている。光散乱処理が施されているため、環状部141内から表側の面141aに入射した光は、全反射されるのではなく、その一部が凹部145c,146cで散乱されて、導光板140の外部へと出射される。なお、素子列対向部分144の表側の面144aには凹部は設けられていない。凹部145c,146cは、形状がそれぞれ略半球状であって、大きさは全て同じである。   The front surface 141a of the annular portion 141 is subjected to light scattering processing. Specifically, the front side surface of the first light scattering portion 145 and the front side surface of the second light scattering portion 146 constituting the front side surface of the inner reflection portion, that is, the first light scattering region 145a and the second light scattering region. In 146a, concave portions 145c and 146c are provided as a light scattering process. Since the light scattering process is performed, the light incident on the front surface 141a from the inside of the annular portion 141 is not totally reflected, but a part thereof is scattered by the concave portions 145c and 146c, and the light guide plate 140 It is emitted to the outside. It should be noted that the front surface 144a of the element column facing portion 144 is not provided with a recess. The recesses 145c and 146c are substantially hemispherical in shape and all have the same size.

第1光散乱部分145と第2光散乱部分146とを比較すると、第1光散乱領域145aと第2光散乱領域146aとには異なる態様の光散乱処理が施されている。具体的には、第1光散乱領域145aよりも第2光散乱領域146aの方が、凹部145c,146cの単位面積当たりの数が多い。そのため、第1光散乱部分145よりも第2光散乱部分146から、より多くの光が出射される。   When the first light scattering portion 145 and the second light scattering portion 146 are compared, the first light scattering region 145a and the second light scattering region 146a are subjected to different modes of light scattering processing. Specifically, the number of the concave portions 145c and 146c per unit area is larger in the second light scattering region 146a than in the first light scattering region 145a. Therefore, more light is emitted from the second light scattering portion 146 than the first light scattering portion 145.

環状部141の裏側の面141bの一部は、発光素子22の光が入射する入射面となっている。素子列対向部分144の裏側の面144bがその入射面に相当する。素子列対向部分144の裏側の面144bは、複数の発光素子22からなる素子列に対向した円環状である。さらに、環状部141の裏側の面141bの全体は、素子収容溝160内において基板121の素子搭載面121aで反射した光が環状部141に入射するための入射面としても機能している。   A part of the surface 141b on the back side of the annular portion 141 is an incident surface on which light from the light emitting element 22 is incident. The back surface 144b of the element array facing portion 144 corresponds to the incident surface. The back surface 144 b of the element array facing portion 144 has an annular shape facing the element array composed of the plurality of light emitting elements 22. Further, the entire surface 141 b on the back side of the annular portion 141 also functions as an incident surface for the light reflected by the element mounting surface 121 a of the substrate 121 in the element accommodating groove 160 to enter the annular portion 141.

環内側部142の構成は、第1の実施形態に係る環内側部42と略同様である。   The configuration of the ring inner portion 142 is substantially the same as that of the ring inner portion 42 according to the first embodiment.

(拡散カバー)
拡散カバー150は、導光板140を覆うドーム状の本体部151と、当該本体部151の周縁部から裏側方向へ延設された側壁部152とを有し、当該側壁部152がケース110の本体部111の側壁部分114に固定されている。本体部151には光散乱処理が施されており、導光板140から出射された光は本体部151を透過する際に散乱光となる。
(Diffusion cover)
The diffusion cover 150 includes a dome-shaped main body 151 that covers the light guide plate 140, and a side wall 152 that extends from the peripheral edge of the main body 151 toward the back side. The side wall 152 is the main body of the case 110. It is fixed to the side wall portion 114 of the portion 111. The main body 151 is subjected to a light scattering process, and the light emitted from the light guide plate 140 becomes scattered light when passing through the main body 151.

(反射部材による輝度むら軽減効果)
本実施の形態でも、第1の実施形態と同様に、発光素子22が存在していない部位(発光素子22に対応する部位)において、素子収容溝160の溝幅が相対的に広がっている。また、素子収容溝160を構成している内側反射部材30aの外周面33aと、基板121の素子搭載面121aとが、それぞれ光反射面となっている。さらに、内側反射部材30aの外周面33aと基板121の素子搭載面121aとがなす角度θ1が鋭角である。したがって、第1の実施形態と同様の効果が得られる。
(反射部材および導光板による輝度むら軽減効果)
本実施の形態でも、第1の実施形態と同様に、環状部141の表側の面141aに光散乱処理が施されているため、環状部141における輝度が従来の照明装置よりも相対的に高くなっており、輝度むらが軽減されている。また、素子列対向部分144に近い第1光散乱部分145よりも、素子列対向部分144に遠い第2光散乱部分146からより多くの光が出射されるため、発光素子22に近い部分63と遠い部分64との輝度差が解消されており、輝度むらが軽減されている。
(Brightness unevenness reduction effect by reflecting member)
Also in the present embodiment, as in the first embodiment, the groove width of the element housing groove 160 is relatively wide at a portion where the light emitting element 22 is not present (a portion corresponding to the light emitting element 22). Further, the outer peripheral surface 33a of the inner reflecting member 30a constituting the element housing groove 160 and the element mounting surface 121a of the substrate 121 are respectively light reflecting surfaces. Furthermore, an angle θ1 formed by the outer peripheral surface 33a of the inner reflecting member 30a and the element mounting surface 121a of the substrate 121 is an acute angle. Therefore, the same effect as the first embodiment can be obtained.
(Effect of reducing brightness unevenness by reflecting member and light guide plate)
Also in this embodiment, as in the first embodiment, the light scattering process is performed on the surface 141a on the front side of the annular portion 141, so that the luminance in the annular portion 141 is relatively higher than that of the conventional lighting device. And uneven brightness is reduced. Further, since more light is emitted from the second light scattering portion 146 farther to the element row facing portion 144 than the first light scattering portion 145 near the element row facing portion 144, the portion 63 closer to the light emitting element 22 and The luminance difference with the distant portion 64 is eliminated, and the luminance unevenness is reduced.

本実施の形態に係る照明装置100は、内側反射部材30aと導光板140とが組み合わされて使用されているため、反射部材による輝度むら軽減効果と、導光板による輝度むら軽減効果との両方の効果を奏する。なお、本発明に係る照明装置は、少なくとも反射部材による輝度むら軽減効果が得られるように反射部材に関する構成を備えていれば良く、導光板に関する構成については任意である。したがって、導光板については、従来の構成が採用されていても構わない。   Since lighting device 100 according to the present embodiment is used in combination with inner reflection member 30a and light guide plate 140, both the luminance unevenness reduction effect by the reflection member and the luminance unevenness reduction effect by the light guide plate are both present. There is an effect. In addition, the illuminating device which concerns on this invention should just be equipped with the structure regarding a reflecting member so that the brightness nonuniformity reduction effect by a reflecting member can be acquired at least, and the structure regarding a light-guide plate is arbitrary. Therefore, a conventional configuration may be adopted for the light guide plate.

<変形例>
以下に、本発明に係る照明装置の変形例について説明する。図19は、変形例に係る導光板および反射部材を説明するための断面図である。
(反射部材)
第1の実施形態では、基板21の素子搭載面21aと内側反射部材30aの外周面33aとがなす角度θ1が鋭角であったが、図19に示すように、基板21の素子搭載面21aと内側反射部材230aの外周面233aとがなす角度θ1は、直角であっても良いし、鈍角であっても良い。また、第1の実施形態では、基板21の素子搭載面21aと外側反射部材30bの内周面33bとがなす角度θ2が鋭角であったが、図19に示すように、基板21の素子搭載面21aと外側反射部材230bの内周面233bとがなす角度θ2は、直角であっても良いし、鈍角であっても良い。
<Modification>
Below, the modification of the illuminating device which concerns on this invention is demonstrated. FIG. 19 is a cross-sectional view for explaining a light guide plate and a reflecting member according to a modification.
(Reflective member)
In the first embodiment, the angle θ1 formed by the element mounting surface 21a of the substrate 21 and the outer peripheral surface 33a of the inner reflecting member 30a is an acute angle. However, as shown in FIG. 19, the element mounting surface 21a of the substrate 21 The angle θ1 formed by the outer peripheral surface 233a of the inner reflecting member 230a may be a right angle or an obtuse angle. In the first embodiment, the angle θ2 formed by the element mounting surface 21a of the substrate 21 and the inner peripheral surface 33b of the outer reflecting member 30b is an acute angle. However, as shown in FIG. The angle θ2 formed by the surface 21a and the inner peripheral surface 233b of the outer reflecting member 230b may be a right angle or an obtuse angle.

(導光板)
本発明に係る導光板に関して、環状部41に設ける光散乱処理は、第1実施形態に限定されず任意である。例えば、光散乱処理として凹部ではなく凸部が設けられていても良いし、凹部と凸部の両方が設けられていても良い。
(Light guide plate)
Regarding the light guide plate according to the present invention, the light scattering process provided in the annular portion 41 is not limited to the first embodiment and is arbitrary. For example, a convex part instead of the concave part may be provided as the light scattering process, or both the concave part and the convex part may be provided.

また、第1の実施形態に係る導光板40では、環状部41の表側の面41aに設ける凹部45c,46c,47c,48cの単位面積当たりの数を変えることによって光散乱処理の態様を異ならしめていたが、他の方法で光散乱処理の態様を異ならしめても良い。   Further, in the light guide plate 40 according to the first embodiment, the light scattering process is made different by changing the number of the concave portions 45c, 46c, 47c, 48c provided on the front surface 41a of the annular portion 41 per unit area. However, the light scattering process may be made different by other methods.

例えば、図19に示す導光板240では、凹部45c,46c,47c,48cの単位面積当たりの数は同じであるが、大きさを異ならしめることによって、異なる態様の光散乱処理を実現している。すなわち、凹部45c,46c,47c,48cの面積占有率を異ならしめることによって、環状部41の表側の面41aにおける光反射面として機能する領域の面積を異ならしめ、これにより異なる光散乱処理の態様を実現している。   For example, in the light guide plate 240 shown in FIG. 19, the number of the recesses 45c, 46c, 47c, and 48c per unit area is the same, but different modes of light scattering processing are realized by making the sizes different. . That is, by making the area occupancy of the recesses 45c, 46c, 47c, and 48c different, the areas of the regions functioning as the light reflecting surfaces on the surface 41a on the front side of the annular part 41 are made different, thereby different aspects of the light scattering process. Is realized.

具体的には、第1光散乱領域245aに設けられた凹部245cの単位面積当たりの数は、第2光散乱領域246aに設けられた凹部246cの単位面積当たりの数と同じである。しかしながら、各凹部245cは各凹部246cよりも小さい。そのため、第1光散乱領域245aにおける光反射面として機能する領域の面積は、第2光散乱領域246aにおける光反射面として機能する領域の面積よりも小さい。したがって、第1光散乱部分245よりも第2光散乱部分246から、より多くの光が出射される。   Specifically, the number per unit area of the recesses 245c provided in the first light scattering region 245a is the same as the number per unit area of the recesses 246c provided in the second light scattering region 246a. However, each recess 245c is smaller than each recess 246c. Therefore, the area of the region functioning as the light reflecting surface in the first light scattering region 245a is smaller than the area of the region functioning as the light reflecting surface in the second light scattering region 246a. Therefore, more light is emitted from the second light scattering portion 246 than from the first light scattering portion 245.

しかも、凹部245cは、凹部246cよりも小さいため、凹部246cよりも光散乱機能が低い。したがって、光散乱機能の差によっても、第1光散乱領域245aよりも第2光散乱領域246aから、より多くの光が出射されるようになっている。   Moreover, since the recess 245c is smaller than the recess 246c, the light scattering function is lower than that of the recess 246c. Therefore, more light is emitted from the second light scattering region 246a than the first light scattering region 245a due to the difference in the light scattering function.

同様に、第3光散乱領域247aに設けられた凹部247cの単位面積当たりの数は、第4光散乱領域248aに設けられた凹部248cの単位面積当たりの数と同じである。しかしながら、各凹部246cは各凹部248cよりも小さい。したがって、第3光散乱部分247よりも第4光散乱部分248から、より多くの光が出射される。   Similarly, the number per unit area of the recesses 247c provided in the third light scattering region 247a is the same as the number per unit area of the recesses 248c provided in the fourth light scattering region 248a. However, each recess 246c is smaller than each recess 248c. Therefore, more light is emitted from the fourth light scattering portion 248 than from the third light scattering portion 247.

各凹部245c,246c,247c,248cの大きさは、例えば以下の式1に基づき変化させることが考えられる。   It is conceivable that the size of each of the recesses 245c, 246c, 247c, 248c is changed based on the following formula 1, for example.

Dr=k1*R^n/cos(m*θ)+k2 ・・・(式1)
なお、「Dr」は凹部の径、「R」は発光素子から凹部までの距離、「θ」は発光素子の光軸に対する凹部のずれ角であり(図19参照)、「k1」、「k2」、「n」、「m」は定数である。
Dr = k1 * R ^ n / cos (m * θ) + k2 (Formula 1)
“Dr” is the diameter of the recess, “R” is the distance from the light emitting element to the recess, “θ” is the displacement angle of the recess with respect to the optical axis of the light emitting element (see FIG. 19), “k1”, “k2” ”,“ N ”, and“ m ”are constants.

式1に基づき各凹部245c,246c,247c,248cの大きさを変化させれば、各凹部245c,246cから放出される光のエネルギーを調整することができる。なお、凹部の大きさを一定にして、凹部の単位面積当たりの数を式1に基づき変化させても良い。   If the sizes of the recesses 245c, 246c, 247c, and 248c are changed based on Expression 1, the energy of light emitted from the recesses 245c and 246c can be adjusted. In addition, the size of the recesses may be constant, and the number of the recesses per unit area may be changed based on Equation 1.

以上のように凹部45c,46c,47c,48cを設けても、発光素子22に近い部分と遠い部分との輝度差を解消し、輝度むらを軽減することができる。   As described above, even when the concave portions 45c, 46c, 47c, and 48c are provided, the luminance difference between the portion close to the light emitting element 22 and the portion far from the light emitting element 22 can be eliminated, and the luminance unevenness can be reduced.

また、第1の実施形態では、素子列対向部分44と環内側部42との間において、第1光散乱部分45と第2光散乱部分46との2段階で異なる態様の光散乱処理が施されていたが、素子列対向部分44と環内側部42との間において、2段階以上の異なる態様で光散乱処理が施されていても良い。また、段階的にではなく、グラデーションのように漸次素子列対向部分44から遠ざかるほど光が散乱するように光散乱処理が施されていても良い。素子列対向部分44と環外側部43との間においても同様である。   Further, in the first embodiment, light scattering processes of different modes are performed between the element array facing portion 44 and the ring inner portion 42 in two stages of the first light scattering portion 45 and the second light scattering portion 46. However, the light scattering treatment may be performed in two or more different modes between the element row facing portion 44 and the ring inner side portion 42. Further, the light scattering process may be performed so that the light is scattered gradually away from the element array facing portion 44 as in gradation, not in steps. The same applies to the portion between the element array facing portion 44 and the outer ring portion 43.

(その他)
以上、本発明に係る照明装置の構成を、実施の形態および変形例に基づいて説明したが、本発明は上記実施の形態およびその変形例に限られない。例えば、上記実施形態およびその変形例の部分的な構成を、適宜組み合わせてなる構成であっても良い。また、上記実施の形態に記載した材料、数値等は好ましいものを例示しているだけであり、それに限定されることはない。さらに、本発明の技術的思想の範囲を逸脱しない範囲で、構成に適宜変更を加えることは可能である。
(Other)
As mentioned above, although the structure of the illuminating device which concerns on this invention was demonstrated based on embodiment and a modification, this invention is not limited to the said embodiment and its modification. For example, the structure which combined suitably the said embodiment and the partial structure of the modification may be sufficient. In addition, the materials, numerical values, and the like described in the above embodiments are merely preferable examples and are not limited thereto. Furthermore, it is possible to appropriately change the configuration without departing from the scope of the technical idea of the present invention.

本発明に係る照明装置は、シーリングライト、ダウンライト、バックライトなど照明用途全般に広く利用可能である。   The lighting device according to the present invention can be widely used in general lighting applications such as a ceiling light, a downlight, and a backlight.

1,100 照明装置
21,121 基板
21a,121a 素子搭載面
22 発光素子
30 反射部材
30a,230a 内側反射部材
30b、230b 外側反射部材
31a,32a 内側反射部材の光反射面
32b,32b 外側反射部材の光反射面
33a,233a 内側反射部の外周面
33b,233b 外側反射部材の内周面
40,140,240 導光板
41,141 環状部
42,142 環内側部
43,143 環外側部
44,144 素子列対向部分
44b,144b 入射面
45,145,245 第1光散乱部分(内側反射部分)
45a,145a,245a 第1光散乱領域
46,146,246 第2光散乱部分(内側反射部分)
46a,146a,246a 第2光散乱領域
47a,147a,247a 第3光散乱領域
48a,148a,248a 第4光散乱領域
45c,46c,47c,48c,145c,146c,245c,246c,247c,248c 凹部
47,247 第3光散乱部分(外側反射部分)
48,248 第4光散乱部分(外側反射部分)
60,160 素子収容溝(溝部)
DESCRIPTION OF SYMBOLS 1,100 Illuminating device 21,121 Board | substrate 21a, 121a Element mounting surface 22 Light emitting element 30 Reflective member 30a, 230a Inner reflecting member 30b, 230b Outer reflecting member 31a, 32a Light reflecting surface of inner reflecting member 32b, 32b Outer reflecting member Light reflecting surface 33a, 233a Inner reflecting portion outer peripheral surface 33b, 233b Outer reflecting member inner peripheral surface 40, 140, 240 Light guide plate 41, 141 Annular portion 42, 142 Annular inner portion 43, 143 Annular outer portion 44, 144 Element Column facing portion 44b, 144b Incident surface 45, 145, 245 First light scattering portion (inner reflection portion)
45a, 145a, 245a First light scattering region 46, 146, 246 Second light scattering part (inner reflection part)
46a, 146a, 246a Second light scattering region 47a, 147a, 247a Third light scattering region 48a, 148a, 248a Fourth light scattering region 45c, 46c, 47c, 48c, 145c, 146c, 245c, 246c, 247c, 248c 47,247 Third light scattering portion (outside reflection portion)
48,248 Fourth light scattering portion (outside reflection portion)
60,160 Element receiving groove (groove)

Claims (5)

導光板の裏側に、複数の発光素子がそれぞれの主出射方向を前記導光板に向けた状態で隣合う発光素子間に間隔を設けて環状に配置され、且つ、光反射面を有する反射部材が前記光反射面と前記導光板の裏側の面の一部とが対向した状態で前記導光板に対して近接配置された照明装置であって、
前記導光版の裏側の面と直交する方向から見て、前記反射部材は、前記複数の発光素子からなる環状の素子列が収容された環状の溝部と重ならない領域に配置されており、
前記溝部は、前記各発光素子に対応する部位の溝幅よりも隣合う発光素子の間隙に対応する部位の溝幅の方が広いことを特徴とする照明装置。
On the back side of the light guide plate, a plurality of light emitting elements are arranged in an annular shape with an interval between adjacent light emitting elements in a state where each main emission direction faces the light guide plate, and a reflecting member having a light reflecting surface The illumination device is disposed in proximity to the light guide plate in a state where the light reflecting surface and a part of the back side surface of the light guide plate are opposed to each other,
When viewed from the direction orthogonal to the back side surface of the light guide plate, the reflecting member is disposed in a region that does not overlap with the annular groove portion in which the annular element row composed of the plurality of light emitting elements is accommodated,
The illumination device according to claim 1, wherein the groove portion has a wider groove width at a portion corresponding to a gap between adjacent light emitting elements than a groove width at a portion corresponding to each light emitting element.
前記導光板は、前記発光素子から出射された光が入射する入射面を有すると共に前記素子列に沿って環状に形成された環状部と、前記環状部の環内側に前記環状部と連続して形成された環内側部と、前記環状部の環外側に前記環状部と連続して形成された環外側部とを備え、
前記反射部材は、前記環内側部の裏側に配置される内側反射部材と、前記環外側部の裏側に配置される環状の外側反射部材とを備え、
前記溝部は、内側周面が前記内側反射部材の外周面で構成されていると共に、外側周面が前記外側反射部材の内周面で構成されていることを特徴とする請求項1記載の照明装置。
The light guide plate has an incident surface on which light emitted from the light emitting element is incident, and an annular portion formed in an annular shape along the element row, and is continuously connected to the annular portion inside the annular portion. An annular inner portion formed, and an annular outer portion formed continuously with the annular portion outside the annular portion;
The reflective member includes an inner reflective member disposed on the back side of the inner ring portion and an annular outer reflective member disposed on the rear side of the outer ring portion,
2. The illumination according to claim 1, wherein the groove portion has an inner peripheral surface constituted by an outer peripheral surface of the inner reflective member and an outer peripheral surface constituted by an inner peripheral surface of the outer reflective member. apparatus.
前記内側反射部材の外周面および前記外側反射部材の内周面は、それぞれ光反射面となっていることを特徴とする請求項1に記載の照明装置。   2. The lighting device according to claim 1, wherein an outer peripheral surface of the inner reflecting member and an inner peripheral surface of the outer reflecting member are light reflecting surfaces, respectively. 前記複数の発光素子は基板に搭載されており、前記基板の素子搭載面は光反射面となっており、前記溝部の底面は前記素子搭載面で構成されていることを特徴とする請求項1に記載の照明装置。   2. The plurality of light emitting elements are mounted on a substrate, an element mounting surface of the substrate is a light reflecting surface, and a bottom surface of the groove is configured by the element mounting surface. The lighting device described in 1. 前記素子搭載面と前記内側反射部材の外周面とがなす角度、および、前記素子搭載面と前記外側反射部材の内周面とがなす角度は、それぞれ鋭角であることを特徴とする請求項4に記載の照明装置。   The angle formed between the element mounting surface and the outer peripheral surface of the inner reflective member and the angle formed between the element mounting surface and the inner peripheral surface of the outer reflective member are acute angles, respectively. The lighting device described in 1.
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