JP2021026158A - Lens and lighting apparatus - Google Patents

Lens and lighting apparatus Download PDF

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JP2021026158A
JP2021026158A JP2019145974A JP2019145974A JP2021026158A JP 2021026158 A JP2021026158 A JP 2021026158A JP 2019145974 A JP2019145974 A JP 2019145974A JP 2019145974 A JP2019145974 A JP 2019145974A JP 2021026158 A JP2021026158 A JP 2021026158A
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lens
light
convex region
optical axis
region
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JP7394335B2 (en
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友樹 白川
Yuki Shirakawa
友樹 白川
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Abstract

To provide a lens capable of suppressing the occurrence of central light falloff that the central part of the lens darkens, and a lighting apparatus including the same.SOLUTION: A lens 30 includes a reflection surface 34 formed in a cylindrical shape around the optical axis. The reflection surface 34 includes: an inner convex region 34a which is convex on the optical axis side; and an outer convex region 34b which is convex on the opposite side of the optical axis. The lighting apparatus includes: the lens 30 that controls the light distribution of incident light; and a light source, and the lighting apparatus is configured so as to change the distance between the lens 30 and the light source along the optical axis direction of the lens 30.SELECTED DRAWING: Figure 8

Description

本開示は、レンズ、および当該レンズを備えた照明器具に関する。 The present disclosure relates to a lens and a luminaire equipped with the lens.

従来、入射する光の配光を制御するレンズを備えた照明器具が広く知られている。例えば、特許文献１には、光源の方向を向く光入射面に環状の突出部が形成され、突出部の先端に位置する平坦面に光を拡散するための拡散処理が施された照明器具用のレンズが開示されている。また、特許文献２には、レンズが光軸方向に沿って移動可能に構成された照明器具が開示されている。 Conventionally, a luminaire provided with a lens for controlling the light distribution of incident light is widely known. For example, in Patent Document 1, an annular protrusion is formed on a light incident surface facing the direction of a light source, and a diffusion treatment is applied to diffuse light on a flat surface located at the tip of the protrusion. Lens is disclosed. Further, Patent Document 2 discloses a luminaire in which a lens is configured to be movable along an optical axis direction.

特開２０１７−６７８３１号公報JP-A-2017-67831 特開２０１９−６１８１４号公報JP-A-2019-61814

ところで、レンズを備えた照明器具において、照射領域の中心部が暗くなる所謂中落ちが発生する場合がある。特に、レンズと光源の距離が近い場合、一般的に配光角が大きくなり中落ちが発生し易くなる。また、レンズが光軸方向に沿って移動可能に構成された照明器具では、レンズを光源に近づけるほど中落ちが発生し易くなる。 By the way, in a lighting fixture provided with a lens, a so-called dropout may occur in which the central portion of the irradiation region becomes dark. In particular, when the distance between the lens and the light source is short, the light distribution angle is generally large and the dropout is likely to occur. Further, in a lighting fixture in which the lens is configured to be movable along the optical axis direction, the closer the lens is to the light source, the more likely it is that a dropout occurs.

本開示の目的は、中落ちの発生を抑制することができるレンズ、および当該レンズを備えた照明器具を提供することである。 An object of the present disclosure is to provide a lens capable of suppressing the occurrence of drop-in, and a luminaire provided with the lens.

本開示の一態様であるレンズは、入射する光の配光を制御するレンズであって、光軸を中心として筒状に形成された反射面を備え、前記反射面は、前記光軸側に凸の内凸領域と、前記光軸と反対側に凸の外凸領域とを含む。 The lens according to one aspect of the present disclosure is a lens that controls the light distribution of incident light, includes a reflecting surface formed in a tubular shape about the optical axis, and the reflecting surface is on the optical axis side. It includes a convex inwardly convex region and an outwardly convex region that is convex on the side opposite to the optical axis.

本開示の一態様である照明器具は、上記レンズと、光源とを備え、前記レンズの光軸方向に沿って前記レンズと前記光源の距離を変更可能に構成されている。 The luminaire according to one aspect of the present disclosure includes the lens and a light source, and is configured so that the distance between the lens and the light source can be changed along the optical axis direction of the lens.

本開示に係るレンズによれば、照射領域の中心部が暗くなる中落ちの発生を抑制でき、配光角を大きくした場合にも均一な光照射が可能な照明器具を提供できる。 According to the lens according to the present disclosure, it is possible to provide a lighting fixture capable of suppressing the occurrence of drop-in that darkens the central portion of the irradiation region and capable of uniform light irradiation even when the light distribution angle is increased.

実施形態の一例である照明器具を斜め上方から見た斜視図である。It is a perspective view which looked at the lighting fixture which is an example of an embodiment from obliquely above. 実施形態の一例である照明器具を斜め下方から見た斜視図である。It is a perspective view which looked at the lighting fixture which is an example of an embodiment from diagonally below. 実施形態の一例である照明器具の分解斜視図である。It is an exploded perspective view of the luminaire which is an example of an embodiment. 実施形態の一例である照明器具の断面図である。It is sectional drawing of the lighting equipment which is an example of an embodiment. 実施形態の一例である照明器具において、光軸方向に沿ったレンズの移動機構を示す図である。It is a figure which shows the moving mechanism of the lens along the optical axis direction in the luminaire which is an example of an embodiment. 実施形態の一例であるレンズを光入射面側から見た斜視図である。It is a perspective view which looked at the lens which is an example of Embodiment from the light incident surface side. 実施形態の一例であるレンズを光出射面側から見た斜視図である。It is a perspective view which looked at the lens which is an example of Embodiment from the light emitting surface side. 実施形態の一例であるレンズの断面図である。It is sectional drawing of the lens which is an example of Embodiment. 実施形態の一例であるレンズの機能を説明するための図である。It is a figure for demonstrating the function of the lens which is an example of an embodiment. 実施形態の一例であるレンズの機能を説明するための図である。It is a figure for demonstrating the function of the lens which is an example of an embodiment.

以下、図面を参照しながら、本開示に係る照明器具の実施形態の一例について詳細に説明する。図１および図２は実施形態の一例である照明器具１０の斜視図、図３は照明器具１０の分解斜視図である。図４は、照明器具１０をレンズ３０の光軸方向に沿って切断した断面図である。 Hereinafter, an example of the embodiment of the lighting fixture according to the present disclosure will be described in detail with reference to the drawings. 1 and 2 are perspective views of the luminaire 10 which is an example of the embodiment, and FIG. 3 is an exploded perspective view of the luminaire 10. FIG. 4 is a cross-sectional view of the luminaire 10 cut along the optical axis direction of the lens 30.

ここで、レンズ３０の光軸Ｘ（図８）とは、レンズ３０の中心を通る軸であって、光入射面３２および光出射面３３の中心を通る軸である。本明細書では、説明の便宜上、照明器具１０を天井に取り付けた状態で、照明器具１０および各構成部材の鉛直上方側を「上」、鉛直下方側を「下」とする。本実施形態では、レンズ３０の光軸が器具本体１１の中心軸と一致し、図１に示す状態では光軸が上下方向に沿っている。 Here, the optical axis X (FIG. 8) of the lens 30 is an axis that passes through the center of the lens 30, and is an axis that passes through the center of the light incident surface 32 and the light emitting surface 33. In the present specification, for convenience of explanation, the vertically upper side of the luminaire 10 and each component is referred to as “upper” and the vertically lower side is referred to as “lower” with the luminaire 10 mounted on the ceiling. In the present embodiment, the optical axis of the lens 30 coincides with the central axis of the instrument body 11, and in the state shown in FIG. 1, the optical axis is along the vertical direction.

図１〜図４に例示するように、照明器具１０は、光源モジュール１が収容される器具本体１１と、器具本体１１の下部に固定される筒状の枠体２０とを備える。器具本体１１は、筒部１２および放熱フィン１３を含み、筒部１２の開口を鉛直下方に向けた状態で天井板の埋込孔に挿入される天井埋込型の照明器具である。照明器具１０は、一般的にダウンライトと呼ばれる。照明器具１０は、光源モジュール１に電力を供給する電源ユニット（図示せず）を備える。なお、電源ユニットは器具本体１１と一体化されていてもよい。 As illustrated in FIGS. 1 to 4, the lighting fixture 10 includes a fixture main body 11 in which the light source module 1 is housed, and a tubular frame 20 fixed to the lower portion of the fixture main body 11. The fixture body 11 is a ceiling-embedded lighting fixture that includes a cylinder portion 12 and heat radiation fins 13 and is inserted into an embedding hole of a ceiling plate with the opening of the cylinder portion 12 facing vertically downward. The luminaire 10 is generally called a downlight. The luminaire 10 includes a power supply unit (not shown) that supplies electric power to the light source module 1. The power supply unit may be integrated with the instrument main body 11.

照明器具１０は、例えば、住居の室内において水平な天井に取り付けられるが、水平方向および鉛直方向に対して傾斜した天井に取り付けることも可能である。また、照明器具１０は住居の廊下、玄関などの天井、或いは図書館等の公共施設、デパート等の商業施設、オフィス、店舗、工場などの天井に取り付けることもできる。照明器具１０が取り付けられる天井は、建築空間の上面を区画するものであればよく、例えば玄関ポーチ、テラスなどの天井であってもよい。なお、本開示に係る照明器具は、ダクトレール等に取り付けられてもよく、天井埋め込み以外の形態で設置対象に固定されてもよい。 The luminaire 10 is attached to a horizontal ceiling, for example, in a living room, but it can also be attached to a ceiling inclined in the horizontal direction and the vertical direction. Further, the lighting fixture 10 can be attached to the ceiling of a corridor of a house, an entrance, a public facility such as a library, a commercial facility such as a department store, an office, a store, a factory, or the like. The ceiling to which the lighting fixture 10 is attached may be any ceiling that partitions the upper surface of the building space, and may be, for example, a ceiling such as an entrance porch or a terrace. The lighting fixture according to the present disclosure may be attached to a duct rail or the like, or may be fixed to the installation target in a form other than embedding in the ceiling.

照明器具１０には、複数の取り付けバネ２３が設けられる。照明器具１０は、取り付けバネ２３が天井裏空間において天井の埋込孔の周囲に当接することで天井に固定される。本実施形態では、枠体２０の周方向に等間隔で３つの取り付けバネ２３が固定されている。照明器具１０は、例えば、枠体２０のフランジ２２が天井面の埋込孔の周縁部に当接した状態で、天井板に取り付けられる。 The luminaire 10 is provided with a plurality of mounting springs 23. The luminaire 10 is fixed to the ceiling by the mounting spring 23 contacting the periphery of the embedded hole in the ceiling in the space behind the ceiling. In the present embodiment, three mounting springs 23 are fixed at equal intervals in the circumferential direction of the frame body 20. The luminaire 10 is attached to the ceiling plate, for example, with the flange 22 of the frame body 20 in contact with the peripheral edge of the embedded hole on the ceiling surface.

照明器具１０は、光源２を含む光源モジュール１と、光源２から出射される光の配光を制御するレンズ３０とを備え、レンズ３０の光軸方向に沿って光源２とレンズ３０の距離を変更可能に構成されている。照明器具１０では、光源２とレンズ３０の距離を変更することで、照射光の配光角を調整することができる。レンズ３０は、光源モジュール１と同様に、器具本体１１の筒部１２に収容されている。本実施形態では、レンズ３０を光源２に近づけると配光角が広がり、レンズ３０を光源２から離すと配光角が狭くなる。 The luminaire 10 includes a light source module 1 including a light source 2 and a lens 30 that controls the light distribution of light emitted from the light source 2, and the distance between the light source 2 and the lens 30 is set along the optical axis direction of the lens 30. It is configured to be changeable. In the luminaire 10, the light distribution angle of the irradiation light can be adjusted by changing the distance between the light source 2 and the lens 30. Similar to the light source module 1, the lens 30 is housed in the tubular portion 12 of the instrument main body 11. In the present embodiment, when the lens 30 is brought closer to the light source 2, the light distribution angle is widened, and when the lens 30 is moved away from the light source 2, the light distribution angle is narrowed.

照明器具１０は、レンズ３０に取り付けられるレンズホルダ４０と、レンズホルダ４０を支持する筒状のバッフル５０とを備える。バッフル５０は、器具本体１１の筒部１２の内径よりも小さな外径を有し、筒部１２の内部に挿入され、筒部１２に対して回転可能に支持されている。レンズ３０は、レンズホルダ４０およびバッフル５０を介して、筒部１２の内部に取り付けられる。 The luminaire 10 includes a lens holder 40 attached to the lens 30 and a tubular baffle 50 that supports the lens holder 40. The baffle 50 has an outer diameter smaller than the inner diameter of the tubular portion 12 of the instrument main body 11, is inserted into the tubular portion 12, and is rotatably supported by the tubular portion 12. The lens 30 is attached to the inside of the tubular portion 12 via the lens holder 40 and the baffle 50.

照明器具１０は、レンズ３０の下方に配置される透光性のカバー６０を備えていてもよい。カバー６０は、樹脂製またはガラス製の円板状部材であって、本実施形態では、略Ｃ字形状のカバー固定部材６１を用いてバッフル５０の筒内に固定されている。カバー固定部材６１は、カバー６０の周縁部に当接してカバー６０を下から支持すると共に、少なくとも３箇所がＣ字の外側に突出してバッフル５０に形成された側孔５３に挿入されることでバッフル５０に固定されている。 The luminaire 10 may include a translucent cover 60 that is located below the lens 30. The cover 60 is a disk-shaped member made of resin or glass, and in the present embodiment, the cover 60 is fixed in the cylinder of the baffle 50 by using the cover fixing member 61 having a substantially C shape. The cover fixing member 61 abuts on the peripheral edge of the cover 60 to support the cover 60 from below, and at least three points protrude outside the C-shape and are inserted into the side holes 53 formed in the baffle 50. It is fixed to the baffle 50.

照明器具１０では、連結部材１５を介して器具本体１１と枠体２０が互いに連結されている。図１では、器具本体１１の中心軸と、枠体２０の中心軸が一致した状態を示しているが、器具本体１１は、その中心軸が、枠体２０の中心軸に対して所定の角度範囲で傾くように構成されている。すなわち、照明器具１０は器具本体１１の首振り機能を有する。照明器具１０は、天井板に取り付けられた状態で、器具本体１１の角度を変えることができる。 In the lighting fixture 10, the fixture body 11 and the frame 20 are connected to each other via a connecting member 15. FIG. 1 shows a state in which the central axis of the instrument body 11 and the central axis of the frame body 20 coincide with each other. However, the central axis of the instrument body 11 has a predetermined angle with respect to the central axis of the frame body 20. It is configured to tilt in the range. That is, the lighting fixture 10 has a swing function of the fixture body 11. The angle of the fixture body 11 can be changed while the lighting fixture 10 is attached to the ceiling plate.

以下、照明器具１０の各構成部材について詳説する。 Hereinafter, each component of the lighting fixture 10 will be described in detail.

光源モジュール１は、例えば光源２と、光源２が配置される基板３とを含む。光源２は、特に限定されないが、好ましくはＬＥＤ（Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉｏｄｅ）等の半導体発光素子である。ＬＥＤは、蛍光体を含む封止層で封止されてもよい。この場合、例えば蛍光体によってＬＥＤの青色光の一部がより長波長の光に変換され、青色光の残りの一部と混色されることで白色光が出射される。光源モジュール１は、光源２の熱を拡散させる放熱板を有していてもよい。 The light source module 1 includes, for example, a light source 2 and a substrate 3 on which the light source 2 is arranged. The light source 2 is not particularly limited, but is preferably a semiconductor light emitting device such as an LED (Light Emitting Diode). The LED may be sealed with a sealing layer containing a phosphor. In this case, for example, a part of the blue light of the LED is converted into light having a longer wavelength by a phosphor, and the white light is emitted by mixing with the remaining part of the blue light. The light source module 1 may have a heat radiating plate that diffuses the heat of the light source 2.

器具本体１１は、有底略円筒形状の筒部１２と、筒部１２に立設した放熱フィン１３とを有する。筒部１２は、略円筒形状の壁面部１２ａと、略真円形状の天面部１２ｂとを含む。器具本体１１は、金属材料で構成されることが好ましく、絞り加工、ダイカスト成形等により製造される。放熱フィン１３は、複数の金属板が天面部１２ｂに立設して形成されている。なお、器具本体の形状は特に限定されず、例えば放熱フィンを有していなくてもよい。 The instrument main body 11 has a bottomed substantially cylindrical tubular portion 12 and heat radiation fins 13 erected on the tubular portion 12. The tubular portion 12 includes a substantially cylindrical wall surface portion 12a and a substantially perfect circular top surface portion 12b. The instrument body 11 is preferably made of a metal material, and is manufactured by drawing, die casting, or the like. The heat radiating fin 13 is formed by erection of a plurality of metal plates on the top surface portion 12b. The shape of the instrument body is not particularly limited, and for example, it does not have to have a heat radiation fin.

本実施形態では、筒部１２の壁面部１２ａの一部、天面部１２ｂ、および放熱フィン１３が一体成形された１つの部材で構成され、壁面部１２ａの残りの一部が別部材である壁面カバー１２ｃで構成されている。壁面カバー１２ｃは、ネジ１８を用いて当該一体成形部材に固定される。 In the present embodiment, a part of the wall surface portion 12a of the tubular portion 12, the top surface portion 12b, and the heat radiation fin 13 are integrally molded with one member, and the remaining part of the wall surface portion 12a is a separate member. It is composed of a cover 12c. The wall surface cover 12c is fixed to the integrally molded member using screws 18.

筒部１２の内周面には、環状溝１２ｄが形成されている。環状溝１２ｄは、壁面部１２ａおよび壁面カバー１２ｃの内面において、筒部１２の周方向に沿って同じ高さに形成される。環状溝１２ｄには、バッフル５０のフランジ５１が挿入される。また、天面部１２ｂの内面には、ホルダ４を用いて光源モジュール１が固定される。光源モジュール１には、電源ユニットにつながるケーブル５が接続されるため、天面部１２ｂにはケーブル挿通孔が形成されている。また、天面部１２ｂには、筒部１２から引き出されたケーブル５を通す筒状のケーブルガイド６が取り付けられていてもよい。 An annular groove 12d is formed on the inner peripheral surface of the tubular portion 12. The annular groove 12d is formed at the same height on the inner surface of the wall surface portion 12a and the wall surface cover 12c along the circumferential direction of the tubular portion 12. The flange 51 of the baffle 50 is inserted into the annular groove 12d. Further, the light source module 1 is fixed to the inner surface of the top surface portion 12b by using the holder 4. Since the cable 5 connected to the power supply unit is connected to the light source module 1, a cable insertion hole is formed in the top surface portion 12b. Further, a tubular cable guide 6 through which the cable 5 drawn from the tubular portion 12 is passed may be attached to the top surface portion 12b.

枠体２０は、器具本体１１の筒部１２の外径よりも一回り大きな内径を有する筒状体であって、筒部１２の周りを囲むように、連結部材１５を介して筒部１２の下部に固定される。枠体２０は、略円筒形状の筒壁２１と、筒壁２１の下端部から径方向外側に張り出したフランジ２２とを含む。また、筒壁２１には、連結部材１５を筒壁２１の上端部に固定するための固定リング２４が取り付けられる。筒壁２１には、固定リング２４を固定するためのネジ２５が締結されるネジ孔が複数形成されている。 The frame body 20 is a tubular body having an inner diameter one size larger than the outer diameter of the tubular portion 12 of the instrument main body 11, and the tubular portion 12 is surrounded by the connecting member 15 so as to surround the tubular portion 12. It is fixed at the bottom. The frame body 20 includes a substantially cylindrical tubular wall 21 and a flange 22 projecting radially outward from the lower end portion of the tubular wall 21. Further, a fixing ring 24 for fixing the connecting member 15 to the upper end portion of the cylinder wall 21 is attached to the cylinder wall 21. The cylinder wall 21 is formed with a plurality of screw holes into which screws 25 for fixing the fixing ring 24 are fastened.

固定リング２４は、筒壁２１の上端部に配置される環状の部材であって、筒壁２１の外面に沿ってフランジ２２側（下方）に延びるバネ固定部２４ａと、バネ固定部２４ａと反対方向（上方）に突出したストッパ２４ｂとを含む。バネ固定部２４ａは、取り付けバネ２３を保持する部分であって、固定リング２４の周方向に間隔をあけて複数設けられる。ストッパ２４ｂは、連結部材１５の後述する係止片１５ｄが当接する部分であって、枠体２０に対する器具本体１１の首振り角度を規制する。 The fixing ring 24 is an annular member arranged at the upper end of the cylinder wall 21, and is opposite to the spring fixing portion 24a extending toward the flange 22 side (downward) along the outer surface of the cylinder wall 21 and the spring fixing portion 24a. Includes a stopper 24b protruding in the direction (upward). A plurality of spring fixing portions 24a are provided to hold the mounting spring 23 at intervals in the circumferential direction of the fixing ring 24. The stopper 24b is a portion where the locking piece 15d, which will be described later, of the connecting member 15 comes into contact with the stopper 24b, and regulates the swing angle of the instrument main body 11 with respect to the frame body 20.

連結部材１５は、環状部１５ａ、環状部１５ａの内縁から上方に延びた第１固定片１５ｂ、および環状部１５ａの内縁から下方に延びた第２固定片１５ｃを含む。また、連結部材１５は、環状部１５ａの内縁から上方に延び、途中で環状部１５ａの径方向外側に折れ曲がった係止片１５ｄを含む。環状部１５ａは、枠体２０の筒壁２１の上端部に配置され、固定リング２４により上から押え付けられて筒壁２１に固定される。本実施形態では、１つの第１固定片１５ｂと、環状部１５ａの径方向に並ぶ２つの第２固定片１５ｃが設けられている。連結部材１５は、例えば１枚の金属板を加工して製造される。 The connecting member 15 includes an annular portion 15a, a first fixing piece 15b extending upward from the inner edge of the annular portion 15a, and a second fixing piece 15c extending downward from the inner edge of the annular portion 15a. Further, the connecting member 15 includes a locking piece 15d that extends upward from the inner edge of the annular portion 15a and is bent outward in the radial direction of the annular portion 15a in the middle. The annular portion 15a is arranged at the upper end of the cylinder wall 21 of the frame body 20, and is pressed from above by the fixing ring 24 to be fixed to the cylinder wall 21. In the present embodiment, one first fixing piece 15b and two second fixing pieces 15c arranged in the radial direction of the annular portion 15a are provided. The connecting member 15 is manufactured by processing, for example, one metal plate.

第１固定片１５ｂおよび第２固定片１５ｃは、器具本体１１にネジ止めされる部分であって、第１固定片１５ｂは器具本体１１の上下方向中央部にネジ１６を用いて固定され、第２固定片１５ｃは器具本体１１の下部にネジ１７を用いて固定される。第１固定片１５ｂは、第２固定片１５ｃより上下方向に長く、また上部が大きく拡幅した形状を有する。第１固定片１５ｂの拡幅部には、ネジ１６が挿通される、緩やかに湾曲した長孔１５ｅが形成されている。なお、第２固定片１５ｃに形成されるネジ挿通孔は、ネジ１７の軸径に対応した丸孔である。 The first fixing piece 15b and the second fixing piece 15c are portions screwed to the instrument main body 11, and the first fixing piece 15b is fixed to the central portion of the instrument main body 11 in the vertical direction by using screws 16. 2 The fixing piece 15c is fixed to the lower part of the instrument main body 11 by using a screw 17. The first fixed piece 15b has a shape that is longer in the vertical direction than the second fixed piece 15c and has a greatly widened upper portion. A gently curved elongated hole 15e through which a screw 16 is inserted is formed in the widened portion of the first fixing piece 15b. The screw insertion hole formed in the second fixing piece 15c is a round hole corresponding to the shaft diameter of the screw 17.

図１に示す状態では、ネジ１６が長孔１５ｅの一端に位置し、器具本体１１の中心軸と枠体２０の中心軸が一致した状態であるが、器具本体１１は、ネジ１７を支点としてネジ１６が長孔１５ｅの他端側に移動するように回転する。照明器具１０によれば、例えば枠体２０を天井に固定した状態で、ネジ１６の締付力に起因して生じる静止摩擦力を超える力を器具本体１１に加えることにより、器具本体１１の中心軸を鉛直方向（枠体２０の中心軸）に対して傾斜させることができる。なお、器具本体１１の中心軸と、レンズ３０の光軸Ｘ（図８）は、首振り角度に関わらず一致している。 In the state shown in FIG. 1, the screw 16 is located at one end of the elongated hole 15e, and the central axis of the instrument body 11 and the central axis of the frame 20 coincide with each other. However, the instrument body 11 uses the screw 17 as a fulcrum. The screw 16 rotates so as to move to the other end side of the elongated hole 15e. According to the lighting fixture 10, for example, in a state where the frame body 20 is fixed to the ceiling, a force exceeding the static friction force generated by the tightening force of the screw 16 is applied to the fixture body 11 to cause the center of the fixture body 11. The shaft can be tilted with respect to the vertical direction (the central axis of the frame body 20). The central axis of the instrument body 11 and the optical axis X (FIG. 8) of the lens 30 are aligned regardless of the swing angle.

レンズ３０は、光源２の光が主に入射する光入射面３２と、光入射面３２から入射した光が主に出射する光出射面３３と、光軸Ｘを中心として筒状に形成された反射面３４とを含む光学部材であって、入射する光の配光を制御する。光入射面３２は平面視において略真円形状を有し、同様に、光出射面３３は底面視において略真円形状を有する。レンズ３０は、光入射面３２側から光出射面３３側に近づくにつれて次第に直径が大きくなり、反射面３４の周長が次第に長くなった末広がりの形状を有する。 The lens 30 is formed in a tubular shape centered on a light incident surface 32 on which the light of the light source 2 is mainly incident, a light emitting surface 33 on which light incident from the light incident surface 32 is mainly emitted, and an optical axis X. An optical member including a reflecting surface 34, which controls the light distribution of incident light. The light incident surface 32 has a substantially perfect circular shape in a plan view, and similarly, the light emitting surface 33 has a substantially perfect circular shape in a bottom view. The lens 30 has a divergent shape in which the diameter gradually increases as the light incident surface 32 side approaches the light emitting surface 33 side, and the peripheral length of the reflecting surface 34 gradually increases.

レンズ３０は、例えばアクリル樹脂、ポリカーボネート、シリコーン等の透明性の高い樹脂、またはガラスで構成される。レンズ３０は、下端部が径方向外側に張り出して形成されたフランジ３５と、光出射面３３の周縁部に複数形成された凹部３６とを有する。凹部３６は、例えばレンズ３０の周方向に等間隔で３つ形成される。また、レンズ３０は、凹部３６に隣接して形成された係合部３７を有する。 The lens 30 is made of a highly transparent resin such as acrylic resin, polycarbonate, or silicone, or glass. The lens 30 has a flange 35 formed so that the lower end portion projects outward in the radial direction, and a plurality of recesses 36 formed on the peripheral edge portion of the light emitting surface 33. For example, three recesses 36 are formed at equal intervals in the circumferential direction of the lens 30. Further, the lens 30 has an engaging portion 37 formed adjacent to the recess 36.

レンズホルダ４０は、環状のベース部４１と、ベース部４１の下端から下方に延び、途中でベース部４１の径方向内側に折れ曲がった鉤部４２と、ベース部４１の外周面から径方向外側に突出した爪部４３とを有する。レンズホルダ４０はレンズ３０に対して光入射面３２側（上側）から装着され、鉤部４２が凹部３６に挿入された後、係合部３７側に回転させることにより、鉤部４２が係合部３７に嵌合する。 The lens holder 40 has an annular base portion 41, a hook portion 42 extending downward from the lower end of the base portion 41 and bent inward in the radial direction of the base portion 41, and a hook portion 42 radially outward from the outer peripheral surface of the base portion 41. It has a protruding claw portion 43. The lens holder 40 is attached to the lens 30 from the light incident surface 32 side (upper side), and after the hook portion 42 is inserted into the recess 36, the hook portion 42 is engaged by rotating the lens holder 40 toward the engaging portion 37 side. Fits into the portion 37.

レンズホルダ４０は、例えば、ベース部４１の少なくとも一部がフランジ３５の上面に当接し、鉤部４２が係合部３７に嵌合することでレンズ３０に固定される。本実施形態では、ベース部４１の周方向に等間隔で３つの鉤部４２が形成され、ベース部４１の径方向に並んで２つの爪部４３が形成されている。また、レンズホルダ４０は、ベース部４１の上面に立設したガイド部４４を有する。ガイド部４４は、例えば、ベース部４１の周方向に等間隔で３つ形成される。詳しくは後述するが、ガイド部４４は、器具本体１１の内部に形成されたリブ１４に係合し、リブ１４に沿ったレンズホルダ４０の上下方向（レンズ３０の光軸方向）の移動をガイドする。 The lens holder 40 is fixed to the lens 30 by, for example, at least a part of the base portion 41 coming into contact with the upper surface of the flange 35 and the hook portion 42 fitting into the engaging portion 37. In the present embodiment, three hook portions 42 are formed at equal intervals in the circumferential direction of the base portion 41, and two claw portions 43 are formed so as to be arranged in the radial direction of the base portion 41. Further, the lens holder 40 has a guide portion 44 erected on the upper surface of the base portion 41. For example, three guide portions 44 are formed at equal intervals in the circumferential direction of the base portion 41. As will be described in detail later, the guide portion 44 engages with the rib 14 formed inside the instrument main body 11 to guide the movement of the lens holder 40 in the vertical direction (optical axis direction of the lens 30) along the rib 14. To do.

図５は、器具本体１１の壁面カバー１２ｃおよび枠体２０を取り外した状態を示す図であって、レンズ３０の光軸方向に沿った移動機構を説明するための図である。本実施形態では、主にレンズホルダ４０およびバッフル５０によって、レンズ３０の移動機構が構成されている。バッフル５０の内周面は、光の反射率が低いことが好ましく、例えば黒色である。この場合、照明器具１０のグレアを低減できる。 FIG. 5 is a diagram showing a state in which the wall surface cover 12c and the frame body 20 of the instrument main body 11 are removed, and is a diagram for explaining a moving mechanism of the lens 30 along the optical axis direction. In the present embodiment, the moving mechanism of the lens 30 is mainly composed of the lens holder 40 and the baffle 50. The inner peripheral surface of the baffle 50 preferably has low light reflectance, for example, black. In this case, the glare of the luminaire 10 can be reduced.

図３〜図５に例示するように、レンズ３０は、レンズホルダ４０を介してバッフル５０に支持される。バッフル５０は略円筒状の部材であって、レンズ３０およびレンズホルダ４０は、バッフル５０の筒内において、レンズ３０の光軸方向に移動可能な状態で配置されている。バッフル５０は、筒壁の外周面において、周方向に沿って形成されたフランジ５１を有する。バッフル５０は、フランジ５１が器具本体１１の筒部１２の内周面に形成された環状溝１２ｄに嵌ることで、筒部１２に対して回転可能に支持される。 As illustrated in FIGS. 3-5, the lens 30 is supported by the baffle 50 via the lens holder 40. The baffle 50 is a substantially cylindrical member, and the lens 30 and the lens holder 40 are arranged in the cylinder of the baffle 50 so as to be movable in the optical axis direction of the lens 30. The baffle 50 has a flange 51 formed along the circumferential direction on the outer peripheral surface of the cylinder wall. The baffle 50 is rotatably supported by the tubular portion 12 by fitting the flange 51 into the annular groove 12d formed on the inner peripheral surface of the tubular portion 12 of the instrument body 11.

バッフル５０には、筒壁の周方向に離れた少なくとも２箇所に、筒壁を貫通する傾斜溝５２が形成されている。傾斜溝５２は、筒壁の周方向および軸方向に公差する方向に延び、溝の長手方向一端が他端よりも筒壁の上部に位置するように傾斜している。傾斜溝５２には、レンズホルダ４０の爪部４３が挿入される。爪部４３は、傾斜溝５２の形状に対応して傾斜した形状を有し、傾斜溝５２に沿って移動可能である。 The baffle 50 is formed with inclined grooves 52 penetrating the cylinder wall at at least two positions separated from each other in the circumferential direction of the cylinder wall. The inclined groove 52 extends in the direction of tolerance in the circumferential direction and the axial direction of the tubular wall, and is inclined so that one end in the longitudinal direction of the groove is located above the tubular wall with respect to the other end. The claw portion 43 of the lens holder 40 is inserted into the inclined groove 52. The claw portion 43 has an inclined shape corresponding to the shape of the inclined groove 52, and can move along the inclined groove 52.

本実施形態では、バッフル５０を回転させることで、爪部４３が傾斜溝５２の下縁によって押し上げられて溝の長手方向一端側（上端側）に移動する、或いは傾斜溝５２の上縁によって押し下げられて溝の長手方向他端側（下端側）に移動する。これにより、レンズホルダ４０は上下方向に移動する。そして、レンズ３０が光軸方向に移動し、光源２とレンズ３０の距離が変化する。なお、レンズホルダ４０のガイド部４４が器具本体１１のリブ１４に係合しているため、レンズホルダ４０の供回りが防止され、レンズホルダ４０はリブ１４に沿って上下方向に移動する。 In the present embodiment, by rotating the baffle 50, the claw portion 43 is pushed up by the lower edge of the inclined groove 52 and moves to one end side (upper end side) in the longitudinal direction of the groove, or is pushed down by the upper edge of the inclined groove 52. It moves to the other end side (lower end side) in the longitudinal direction of the groove. As a result, the lens holder 40 moves in the vertical direction. Then, the lens 30 moves in the optical axis direction, and the distance between the light source 2 and the lens 30 changes. Since the guide portion 44 of the lens holder 40 is engaged with the rib 14 of the instrument main body 11, the rotation of the lens holder 40 is prevented, and the lens holder 40 moves in the vertical direction along the rib 14.

バッフル５０は、例えば、下部が把持されて回転させられるため、バッフル５０の下部には滑り止め用の凹凸、溝等が形成されていてもよい。また、バッフル５０の下部には、レンズ３０の位置、光源２とレンズ３０の距離等を示す目盛りが設けられていてもよい。 Since the lower portion of the baffle 50 is gripped and rotated, for example, the lower portion of the baffle 50 may have irregularities, grooves, or the like for preventing slipping. Further, a scale indicating the position of the lens 30, the distance between the light source 2 and the lens 30, and the like may be provided in the lower part of the baffle 50.

以下、図６〜図８を参照しながら、レンズ３０の構成について、さらに詳説する。図６はレンズ３０を光入射面３２側から見た斜視図、図７はレンズ３０を光出射面３３側から見た斜視図である。図８は、レンズ３０の断面図である。 Hereinafter, the configuration of the lens 30 will be described in more detail with reference to FIGS. 6 to 8. FIG. 6 is a perspective view of the lens 30 viewed from the light incident surface 32 side, and FIG. 7 is a perspective view of the lens 30 viewed from the light emitting surface 33 side. FIG. 8 is a cross-sectional view of the lens 30.

図６〜図８に例示するように、レンズ３０は、光入射面３２側よりも光出射面３３側で直径が大きくなった末広がりの形状を有する。レンズ３０は、上記の通り、光源２の光が主に入射する光入射面３２と、光入射面３２から入射した光が主に出射する光出射面３３と、光軸Ｘを中心として筒状に形成された反射面３４とを含む。反射面３４は、臨界角以上の入射光を全反射するレンズ３０の側面である。反射面３４に臨界角未満の光が入射した場合、例えば当該光は反射面３４を透過してレンズ３０を囲むバッフル５０に吸収される。レンズ３０は、光軸Ｘを中心として回転対称に形成されることが好ましい。 As illustrated in FIGS. 6 to 8, the lens 30 has a divergent shape having a larger diameter on the light emitting surface 33 side than on the light incident surface 32 side. As described above, the lens 30 has a tubular shape centered on the light incident surface 32 on which the light of the light source 2 is mainly incident, the light emitting surface 33 on which the light incident from the light incident surface 32 is mainly emitted, and the optical axis X. Includes a reflective surface 34 formed in. The reflecting surface 34 is a side surface of the lens 30 that totally reflects the incident light having a critical angle or more. When light below the critical angle is incident on the reflecting surface 34, for example, the light passes through the reflecting surface 34 and is absorbed by the baffle 50 surrounding the lens 30. The lens 30 is preferably formed rotationally symmetrically about the optical axis X.

レンズ３０は、レンズホルダ４０の取り付けに利用される、フランジ３５、凹部３６、および係合部３７を有する。レンズホルダ４０は、環状に形成されたベース部４１の少なくとも一部がフランジ３５を上から押え、鉤部４２が係合部３７に嵌合することで、レンズ３０の周縁部を上下から挟持する。係合部３７は、レンズ３０の周方向に凹部３６と隣接配置され、係合部３７の下面には鉤部４２が引っ掛かる段差が形成されている。 The lens 30 has a flange 35, a recess 36, and an engaging portion 37 that are used to attach the lens holder 40. In the lens holder 40, at least a part of the base portion 41 formed in an annular shape presses the flange 35 from above, and the hook portion 42 fits into the engaging portion 37 to sandwich the peripheral edge portion of the lens 30 from above and below. .. The engaging portion 37 is arranged adjacent to the recess 36 in the circumferential direction of the lens 30, and a step on which the hook portion 42 is hooked is formed on the lower surface of the engaging portion 37.

レンズ３０は、光軸方向の一端側に形成された凹部３１を有する。レンズ３０は、凹部３１が光源モジュール１側に向くように配置され、凹部３１の底に形成された面が光入射面３２となる。また、光軸方向一端がレンズ３０の上端、光軸方向他端がレンズ３０の下端となる。凹部３１は、光軸Ｘを中心として回転対称に形成されることが好ましい。凹部３１は、例えばレンズ３０の上端から光軸方向に、光軸方向長さ（厚み）の３０％〜７０％の深さで形成される。 The lens 30 has a recess 31 formed on one end side in the optical axis direction. The lens 30 is arranged so that the recess 31 faces the light source module 1 side, and the surface formed on the bottom of the recess 31 is the light incident surface 32. Further, one end in the optical axis direction is the upper end of the lens 30, and the other end in the optical axis direction is the lower end of the lens 30. The recess 31 is preferably formed rotationally symmetrically about the optical axis X. The recess 31 is formed, for example, from the upper end of the lens 30 in the optical axis direction at a depth of 30% to 70% of the length (thickness) in the optical axis direction.

レンズ３０では、主に、光入射面３２から光源２の光が入射し、光出射面３３の光出射制御面３３ａから配光制御された光が出射する。光源２から出射した光の大部分は凹部３１に導入され、光入射面３２からレンズ３０内に入射する。他方、凹部３１に導入された光の一部は、例えば凹部３１の側面３１ａから入射して反射面３４で反射され、光出射面３３から出射される。 In the lens 30, the light of the light source 2 is mainly incident from the light incident surface 32, and the light whose light distribution is controlled is emitted from the light emission control surface 33a of the light emission surface 33. Most of the light emitted from the light source 2 is introduced into the recess 31 and enters the lens 30 from the light incident surface 32. On the other hand, a part of the light introduced into the recess 31 is incident from, for example, the side surface 31a of the recess 31, reflected by the reflecting surface 34, and emitted from the light emitting surface 33.

光入射面３２は、凹部３１の底面であって、光軸に対して略垂直に、すなわちレンズ３０の径方向と略平行に形成されている。また、凹部３１の側面３１ａは略円筒状に形成され、凹部３１の上端から下端に向かって緩やかに縮径している。光入射面３２には、光ムラを軽減するための微細な凹凸であるディンプル３２ｘが形成されていてもよい。ディンプル３２ｘは、例えば光入射面３２の全域に形成される。なお、光入射面３２は光源モジュール１側に膨らんだ湾曲面であってもよい。 The light incident surface 32 is the bottom surface of the recess 31, and is formed substantially perpendicular to the optical axis, that is, substantially parallel to the radial direction of the lens 30. Further, the side surface 31a of the recess 31 is formed in a substantially cylindrical shape, and the diameter is gradually reduced from the upper end to the lower end of the recess 31. Dimples 32x, which are fine irregularities for reducing light unevenness, may be formed on the light incident surface 32. The dimples 32x are formed, for example, over the entire area of the light incident surface 32. The light incident surface 32 may be a curved surface bulging toward the light source module 1.

光出射面３３は、光源モジュール１と反対側を向いた面であって、光入射面３２より大面積に形成されている。光出射面３３には、少なくとも１つの凸部を含む光出射制御面３３ａが含まれる。光出射制御面３３ａは、湾曲面またはレンズ３０の径方向に対して傾斜した面であって、この面を光が透過することで配光が制御される。光出射制御面３３ａは、光出射面３３の中央部において、光出射面３３の３０％〜７０％、好ましくは４０％〜６０％の面積で形成される。なお、フランジ３５の下面は光出射面３３に含まれないものとする。 The light emitting surface 33 is a surface facing the opposite side to the light source module 1, and is formed in a larger area than the light incident surface 32. The light emitting surface 33 includes a light emitting control surface 33a including at least one convex portion. The light emission control surface 33a is a curved surface or a surface inclined with respect to the radial direction of the lens 30, and the light distribution is controlled by transmitting light through this surface. The light emission control surface 33a is formed in the central portion of the light emission surface 33 in an area of 30% to 70%, preferably 40% to 60% of the light emission surface 33. The lower surface of the flange 35 is not included in the light emitting surface 33.

光出射制御面３３ａの周囲には、レンズ３０の径方向と略平行な面が形成されている。本実施形態では、当該径方向に沿った面に微細な凹凸であるディンプル３３ｘが形成されていている。ディンプル３３ｘは、光出射面３３のうち、レンズ３０の径方向と略平行な面の全域に形成されていてもよい。光出射面３３は、凹部３１と同様に、光軸Ｘを中心として回転対称に形成されることが好ましい。 A surface substantially parallel to the radial direction of the lens 30 is formed around the light emission control surface 33a. In the present embodiment, dimples 33x, which are fine irregularities, are formed on the surface along the radial direction. The dimples 33x may be formed on the entire surface of the light emitting surface 33 that is substantially parallel to the radial direction of the lens 30. The light emitting surface 33 is preferably formed rotationally symmetrically about the optical axis X, similarly to the recess 31.

光出射制御面３３ａには、例えば、光軸Ｘを中心とする環状の溝が形成され、これにより環状の凸部が形成される。環状の溝（環状の凸部）は、同心円状に複数形成されていてもよい。レンズ３０は、光出射面３３の断面が鋸歯状に形成された所謂フレネルレンズであることが好ましい。本実施形態では、光出射面３３の中央部に外側に向かって湾曲した底面視真円形状の凸部３８と、凸部３８を囲むように同心円状に２本の溝が形成されている。この環状の溝により、光出射面３３には、凸部３８を囲むように環状の凸部３９が形成される。 On the light emission control surface 33a, for example, an annular groove centered on the optical axis X is formed, whereby an annular convex portion is formed. A plurality of annular grooves (annular convex portions) may be formed concentrically. The lens 30 is preferably a so-called Fresnel lens in which the cross section of the light emitting surface 33 is formed in a serrated shape. In the present embodiment, a convex portion 38 having a perfect circular shape in the bottom view curved toward the outside and two grooves concentrically formed so as to surround the convex portion 38 are formed in the central portion of the light emitting surface 33. Due to the annular groove, an annular convex portion 39 is formed on the light emitting surface 33 so as to surround the convex portion 38.

光出射制御面３３ａは、反射面３４側から光軸Ｘ側に向かって、すなわちレンズ３０の径方向外側から内側に向かって光入射面３２に近づくように傾斜した斜面領域３３ｂを含む。斜面領域３３ｂは、凸部３８，３９を囲み、一定の幅で環状に形成される。本実施形態では、光出射制御面３３ａの外周縁に沿って斜面領域３３ｂが形成されている。斜面領域３３ｂは、後述の図９に示すように、光入射面３２の周縁部から入射する光を反射面３４側に反射させて、目的とする照射領域の外側に光が飛ぶことで発生する光ムラを抑制する。 The light emission control surface 33a includes a slope region 33b inclined so as to approach the light incident surface 32 from the reflecting surface 34 side toward the optical axis X side, that is, from the radial outer side to the inner side of the lens 30. The slope region 33b surrounds the convex portions 38 and 39 and is formed in an annular shape with a constant width. In the present embodiment, the slope region 33b is formed along the outer peripheral edge of the light emission control surface 33a. As shown in FIG. 9 described later, the slope region 33b is generated by reflecting the light incident from the peripheral edge of the light incident surface 32 toward the reflecting surface 34 and causing the light to fly outside the target irradiation region. Suppresses light unevenness.

斜面領域３３ｂは、光軸Ｘに垂直な平面に対して２０°〜４０°の角度で傾斜していることが好ましい。レンズ３０の断面視において、斜面領域３３ｂを延長した仮想線と、光軸Ｘに対して垂直な仮想線とがなす角度θは、２０°〜４０°が好ましく、２５°〜３５°がより好ましい。角度θが当該範囲内であれば、光入射面３２の周縁部から入射する光による目的とする照射領域の外側に光が飛ぶことで発生する光ムラを抑制し易い。斜面領域３３ｂは、緩やかな湾曲面であってもよく、平坦な傾斜面であってもよい。 The slope region 33b is preferably inclined at an angle of 20 ° to 40 ° with respect to a plane perpendicular to the optical axis X. In the cross-sectional view of the lens 30, the angle θ formed by the virtual line extending the slope region 33b and the virtual line perpendicular to the optical axis X is preferably 20 ° to 40 °, more preferably 25 ° to 35 °. .. When the angle θ is within the range, it is easy to suppress light unevenness caused by light flying outside the target irradiation region due to light incident from the peripheral edge of the light incident surface 32. The slope region 33b may be a gently curved surface or a flat inclined surface.

レンズ３０は、光入射面３２の直径をφ１、斜面領域３３ｂの内径（斜面領域３３ｂの内周縁の差し渡し径）をφ２、および斜面領域３３ｂの外径（斜面領域３３ｂの外周縁の差し渡し径）をφ３としたとき、φ２＜φ１＜φ３の関係を満たす。なお、光入射面３２および光出射制御面３３ａは、いずれも光軸Ｘを中心として回転対称に形成されている。光出射制御面３３ａは、光入射面３２よりも大きな投影面積を有し、かつレンズ３０の光軸方向に光入射面３２の全体と重なるように形成される。 In the lens 30, the diameter of the light incident surface 32 is φ1, the inner diameter of the slope region 33b (the diameter of the inner peripheral edge of the slope region 33b) is φ2, and the outer diameter of the slope region 33b (the diameter of the outer peripheral edge of the slope region 33b). When is φ3, the relationship of φ2 <φ1 <φ3 is satisfied. The light incident surface 32 and the light emission control surface 33a are both formed rotationally symmetrically about the optical axis X. The light emission control surface 33a has a projected area larger than that of the light incident surface 32, and is formed so as to overlap the entire light incident surface 32 in the optical axis direction of the lens 30.

レンズ３０はφ２＜φ１＜φ３の関係を満たすので、環状に形成された斜面領域３３ｂは、レンズ３０の光軸方向に光入射面３２の周縁と重なる位置に形成される。斜面領域３３ｂは、内周縁が光入射面３２の周縁よりもレンズ３０の径方向内側に、外周縁が光入射面３２の周縁よりもレンズ３０の径方向外側にそれぞれ位置する。このため、光入射面３２の周縁部から入射した光は斜面領域３３ｂに入射し易くなる。 Since the lens 30 satisfies the relationship of φ2 <φ1 <φ3, the annularly formed slope region 33b is formed at a position overlapping the peripheral edge of the light incident surface 32 in the optical axis direction of the lens 30. The inner peripheral edge of the slope region 33b is located radially inside the lens 30 with respect to the peripheral edge of the light incident surface 32, and the outer peripheral edge is located radially outside the lens 30 with respect to the peripheral edge of the light incident surface 32. Therefore, the light incident from the peripheral edge of the light incident surface 32 is likely to be incident on the slope region 33b.

図９は、斜面領域３３ｂによる光ムラの抑制効果を説明するための図である。図９に例示するように、レンズ３０がφ２＜φ１＜φ３の関係を満し、環状に形成された斜面領域３３ｂが光軸方向に光入射面３２の周縁と重なって形成される場合、光入射面３２の周縁部から入射した光は、例えば斜面領域３３ｂによってレンズ３０の径方向外側に反射される。そして、この光は反射面３４を透過してバッフル５０に吸収される。なお、光入射面３２の周縁部から入射した光はレンズ３０の外側に大きく広がって、目的とする照射領域の外側に照射される場合がある。また、反射面３４で反射されて光入射面３２の周縁近傍を通る光は斜面領域３３ｂを透過して照射される。なお、反射面３４で反射されて光入射面３２の周縁近傍を通る光は、光出射制御面３３ａを透過して照射されると、目的とする照射領域の外側に照射されることがある。φ２＜φ１＜φ３の関係を満たすレンズ３０によれば、目的とする照射領域の外側に光が飛ぶことで発生する光ムラを抑制することができる。 FIG. 9 is a diagram for explaining the effect of suppressing light unevenness due to the slope region 33b. As illustrated in FIG. 9, when the lens 30 satisfies the relationship of φ2 <φ1 <φ3 and the annularly formed slope region 33b is formed so as to overlap the peripheral edge of the light incident surface 32 in the optical axis direction, light is emitted. The light incident from the peripheral edge of the incident surface 32 is reflected outward in the radial direction of the lens 30 by, for example, the slope region 33b. Then, this light passes through the reflecting surface 34 and is absorbed by the baffle 50. The light incident from the peripheral edge of the light incident surface 32 may be widely spread to the outside of the lens 30 and irradiated to the outside of the target irradiation region. Further, the light reflected by the reflecting surface 34 and passing near the peripheral edge of the light incident surface 32 is transmitted through the slope region 33b and irradiated. When the light reflected by the reflecting surface 34 and passing near the peripheral edge of the light incident surface 32 is transmitted through the light emission control surface 33a and irradiated, it may be irradiated to the outside of the target irradiation region. According to the lens 30 that satisfies the relationship of φ2 <φ1 <φ3, it is possible to suppress light unevenness caused by light flying outside the target irradiation region.

レンズ３０は、光入射面３２の直径φ１、斜面領域３３ｂの内径φ２、および斜面領域３３ｂの外径φ３について、下記（１）および（２）のうち少なくとも一方の関係を満たすことが好ましく、（１）および（２）の両方の関係を満たすことが特に好ましい。
（１）０．９５×φ１＜φ２＜０．９９×φ１
（２）１．０４×φ１＜φ３＜１．０７×φ１
当該（１）および（２）の条件が満たされる場合、上記光ムラの発生をより効果的に抑制できる。 The lens 30 preferably satisfies at least one of the following relationships (1) and (2) with respect to the diameter φ1 of the light incident surface 32, the inner diameter φ2 of the slope region 33b, and the outer diameter φ3 of the slope region 33b. It is particularly preferable to satisfy the relationship of both 1) and (2).
(1) 0.95 × φ1 <φ2 <0.99 × φ1
(2) 1.04 × φ1 <φ3 <1.07 × φ1
When the conditions (1) and (2) are satisfied, the occurrence of the above-mentioned light unevenness can be suppressed more effectively.

反射面３４は、上記のように、光軸Ｘを中心として略円筒状に形成されたレンズ３０の側面であって、径方向外側に広がる光を光出射面３３側に反射させて光の利用効率を向上させる。反射面３４は、所謂全反射面であって、臨界角以上の角度で入射する光を全反射する。反射面３４は、上端から下端に向かって次第に拡径している。なお、反射面３４の上端はレンズ３０の上端に位置し、フランジ３５との境界が反射面３４の下端となる。 As described above, the reflecting surface 34 is a side surface of the lens 30 formed in a substantially cylindrical shape about the optical axis X, and the light spreading outward in the radial direction is reflected toward the light emitting surface 33 side to utilize the light. Improve efficiency. The reflecting surface 34 is a so-called total reflecting surface, and totally reflects light incident at an angle equal to or higher than the critical angle. The diameter of the reflective surface 34 gradually increases from the upper end to the lower end. The upper end of the reflecting surface 34 is located at the upper end of the lens 30, and the boundary with the flange 35 is the lower end of the reflecting surface 34.

反射面３４は、光軸Ｘ側（レンズ３０の内側）に凸の内凸領域３４ａと、光軸Ｘと反対側（レンズ３０の外側）に凸の外凸領域３４ｂとを含む。内凸領域３４ａおよび外凸領域３４ｂはそれぞれ、一定の幅（光軸方向長さ）で環状に形成されている。内凸領域３４ａおよび外凸領域３４ｂを含む反射面３４は、光軸Ｘを中心として回転対称に形成されることが好ましい。本実施形態では、内凸領域３４ａおよび外凸領域３４ｂによって、反射面３４に規則的な凹凸が形成されている。 The reflecting surface 34 includes an inwardly convex region 34a that is convex on the optical axis X side (inside the lens 30) and an outwardly convex region 34b that is convex on the side opposite to the optical axis X (outside the lens 30). The inner convex region 34a and the outer convex region 34b are each formed in an annular shape with a constant width (length in the optical axis direction). The reflecting surface 34 including the inwardly convex region 34a and the outwardly convex region 34b is preferably formed rotationally symmetrically about the optical axis X. In the present embodiment, the reflecting surface 34 has regular irregularities formed by the inner convex region 34a and the outer convex region 34b.

図１０は、反射面３４による中落ちの抑制効果を説明するための図である。図１０に例示するように、反射面３４に内凸領域３４ａおよび外凸領域３４ｂが形成される場合、反射面３４で反射した光が照明器具１０の直下に効率良く照射され、照射領域の中心部が暗くなる中落ちの発生を抑制できる。特に、光源２とレンズ３０の距離を近づけて配光角を大きく設定した場合に中落ちが発生し易くなるが、レンズ３０によれば、例えば内凸領域３４ａによって径方向外側に広がる光を照明器具１０の直下方向に反射させることができる。また、外凸領域３４ｂは、特に光源２とレンズ３０を離して配光角を小さく設定した場合に照明器具１０の直下に効率良く光を反射させることができる。 FIG. 10 is a diagram for explaining the effect of suppressing the drop-in by the reflecting surface 34. As illustrated in FIG. 10, when the internally convex region 34a and the outward convex region 34b are formed on the reflecting surface 34, the light reflected by the reflecting surface 34 is efficiently irradiated directly under the luminaire 10, and the center of the irradiation region. It is possible to suppress the occurrence of drop-in in the darkened part. In particular, when the distance between the light source 2 and the lens 30 is set close to each other and the light distribution angle is set to be large, a dropout is likely to occur. It can be reflected in the direction directly below the instrument 10. Further, the outer convex region 34b can efficiently reflect light directly under the luminaire 10 particularly when the light source 2 and the lens 30 are separated from each other and the light distribution angle is set small.

反射面３４は、内凸領域３４ａおよび外凸領域３４ｂをそれぞれ複数含み、波形に形成されていてもよいが、好ましくはそれぞれを１つずつ含む。そして、内凸領域３４ａは、外凸領域３４ｂよりも光出射面３３側、すなわちレンズ３０の下端側に形成されることが好適である。本実施形態では、１つの内凸領域３４ａと、１つの外凸領域３４ｂが反射面３４に含まれ、連続した内凸領域３４ａおよび外凸領域３４ｂが反射面３４の全体に形成されている。 The reflecting surface 34 may include a plurality of inner convex regions 34a and a plurality of outer convex regions 34b and may be formed in a corrugated manner, but preferably includes one of each. The inward convex region 34a is preferably formed on the light emitting surface 33 side, that is, on the lower end side of the lens 30 with respect to the outer convex region 34b. In the present embodiment, one inward convex region 34a and one outward convex region 34b are included in the reflection surface 34, and a continuous inward convex region 34a and an outer convex region 34b are formed in the entire reflection surface 34.

内凸領域３４ａおよび外凸領域３４ｂは、屈曲部を有さない湾曲面であることが好ましく、光軸Ｘを中心として環状に形成される。本実施形態では、内凸領域３４ａがレンズ３０の内側に向かって緩やかに湾曲し、外凸領域３４ｂがレンズ３０の外側に向かって緩やかに湾曲している。内凸領域３４ａおよび外凸領域３４ｂは、曲率が一定の湾曲面であってもよく、曲率が変化する湾曲面であってもよい。本実施形態では、外凸領域３４ｂの曲率半径Ｒ２が、内凸領域３４ａの曲率半径Ｒ１よりも大きくなっている。 The inner convex region 34a and the outer convex region 34b are preferably curved surfaces having no bent portion, and are formed in an annular shape about the optical axis X. In the present embodiment, the inner convex region 34a is gently curved toward the inside of the lens 30, and the outer convex region 34b is gently curved toward the outside of the lens 30. The inner convex region 34a and the outer convex region 34b may be curved surfaces having a constant curvature or curved surfaces having a changing curvature. In the present embodiment, the radius of curvature R2 of the outer convex region 34b is larger than the radius of curvature R1 of the inner convex region 34a.

本実施形態では、外凸領域３４ｂの幅（光軸方向長さ）が内凸領域３４ａの幅よりも広く、外凸領域３４ｂの面積Ｓ２は内凸領域３４ａの面積Ｓ１よりも大きい。なお、内凸領域３４ａと外凸領域３４ｂの面積比は、後述するように、各領域の曲率等に応じて適宜変更することが好ましく、Ｓ１≧Ｓ２であってもよい。 In the present embodiment, the width (length in the optical axis direction) of the outer convex region 34b is wider than the width of the inner convex region 34a, and the area S2 of the outer convex region 34b is larger than the area S1 of the inner convex region 34a. The area ratio between the inner convex region 34a and the outer convex region 34b is preferably changed as appropriate according to the curvature of each region, and may be S1 ≧ S2, as will be described later.

レンズ３０は、内凸領域３４ａの面積をＳ１、内凸領域３４ａの曲率半径をＲ１、外凸領域３４ｂの面積をＳ２、外凸領域３４ｂの曲率半径をＲ２、および反射面３４の最大の直径をφとしたとき、下記（１）および（２）のうち少なくとも一方の関係を満たすことが好ましく、（１）および（２）の両方の関係を満たすことが特に好ましい。
（１）Ｒ２≧１．５×φ
（２）５×φ×（Ｓ１／Ｓ２）2≦Ｒ１≦２５×φ×（Ｓ１／Ｓ２）2 In the lens 30, the area of the inner convex region 34a is S1, the radius of curvature of the inner convex region 34a is R1, the area of the outer convex region 34b is S2, the radius of curvature of the outer convex region 34b is R2, and the maximum diameter of the reflecting surface 34. When φ is defined as φ, it is preferable to satisfy at least one of the following relationships (1) and (2), and it is particularly preferable to satisfy both relationships (1) and (2).
(1) R2 ≧ 1.5 × φ
(2) 5 × φ × (S1 / S2) 2 ≦ R1 ≦ 25 × φ × (S1 / S2) 2

当該（１）および（２）の条件が満たされる場合、上記中落ちの発生をより効果的に抑制できる。例えば、内凸領域３４ａの面積Ｓ１が小さい場合は、内凸領域３４ａの曲率半径Ｒ１を小さくして曲率を大きく設定することが好ましい。 When the conditions (1) and (2) are satisfied, the occurrence of the above-mentioned dropout can be suppressed more effectively. For example, when the area S1 of the inward convex region 34a is small, it is preferable to set the radius of curvature R1 of the inward convex region 34a to be small and the curvature to be large.

以上のように、レンズ３０を備えた照明器具１０によれば、照射領域の中心部が暗くなる中落ちの発生を抑制でき、配光角を大きくした場合にも均一な光照射が可能である。反射面３４に内凸領域３４ａと外凸領域３４ｂが存在することにより、光源２とレンズ３０の距離が変化する照明器具１０においても、目的とする配光制御を実現しつつ、中落ちの発生を高度に抑制することができる。また、φ２＜φ１＜φ３の関係を満たすことにより、目的とする照射領域の外側に光が飛ぶことで発生する光ムラを抑制できる。 As described above, according to the luminaire 10 provided with the lens 30, it is possible to suppress the occurrence of dropouts in which the central portion of the irradiation region becomes dark, and uniform light irradiation is possible even when the light distribution angle is increased. .. Due to the presence of the inwardly convex region 34a and the outwardly convex region 34b on the reflecting surface 34, even in the luminaire 10 in which the distance between the light source 2 and the lens 30 changes, the target light distribution control is realized and the dropout occurs. Can be highly suppressed. Further, by satisfying the relationship of φ2 <φ1 <φ3, it is possible to suppress the light unevenness generated by the light flying outside the target irradiation region.

なお、上記の実施形態は、本開示の目的を損なわない範囲で適宜設計変更できる。例えば、上記の実施形態では、首振り機能を有する照明器具１０を例示したが、照明器具は首振り機能を有していなくてもよい。また、光出射制御面には斜面領域３３ｂが存在しなくてもよく、レンズはφ２＜φ１＜φ３の関係を満たしていなくてもよい。 The design of the above embodiment can be appropriately changed as long as the object of the present disclosure is not impaired. For example, in the above embodiment, the luminaire 10 having the swing function is illustrated, but the luminaire may not have the swing function. Further, the slope region 33b may not exist on the light emission control surface, and the lens may not satisfy the relationship of φ2 <φ1 <φ3.

１ 光源モジュール、２ 光源、３ 基板、４ ホルダ、５ ケーブル、６ ケーブルガイド、１０ 照明器具、１１ 器具本体、１２ 筒部、１２ａ 壁面部、１２ｂ 天面部、１２ｃ 壁面カバー、１２ｄ 環状溝、１３ 放熱フィン、１４ リブ、１５ 連結部材、１５ａ 環状部、１５ｂ 第１固定片、１５ｃ 第２固定片、１５ｄ 係止片、１５ｅ 長孔、１６，１７，１８ ネジ、２０ 枠体、２１ 筒壁、２２ フランジ、２３ 取り付けバネ、２４ 固定リング、２４ａ バネ固定部、２４ｂ ストッパ、２５ ネジ、３０ レンズ、３１ 凹部、３２ 光入射面、３３ 光出射面、３３ａ 光出射制御面、３３ｂ 斜面領域、３４ 反射面、３４ａ 内凸領域、３４ｂ 外凸領域、３５ フランジ、３６ 凹部、３７ 係合部、４０ レンズホルダ、４１ ベース部、４２ 鉤部、４３ 爪部、４４ ガイド部、５０ バッフル、５１ フランジ、５２ 傾斜溝、５３ 側孔、６０ カバー、６１ カバー固定部材 1 Light source module, 2 light source, 3 board, 4 holder, 5 cable, 6 cable guide, 10 lighting fixture, 11 fixture body, 12 cylinder, 12a wall surface, 12b top surface, 12c wall cover, 12d annular groove, 13 heat dissipation Fins, 14 ribs, 15 connecting members, 15a annular part, 15b first fixing piece, 15c second fixing piece, 15d locking piece, 15e long hole, 16, 17, 18 screws, 20 frame, 21 cylinder wall, 22 Flange, 23 mounting spring, 24 fixing ring, 24a spring fixing part, 24b stopper, 25 screws, 30 lenses, 31 recesses, 32 light incident surface, 33 light emitting surface, 33a light emitting control surface, 33b slope area, 34 reflecting surface , 34a Inner convex region, 34b Outer convex region, 35 flange, 36 concave, 37 engaging part, 40 lens holder, 41 base part, 42 hook part, 43 claw part, 44 guide part, 50 baffle, 51 flange, 52 tilt Groove, 53 side hole, 60 cover, 61 cover fixing member

Claims (7)

入射する光の配光を制御するレンズであって、
光軸を中心として筒状に形成された反射面を備え、
前記反射面は、前記光軸側に凸の内凸領域と、前記光軸と反対側に凸の外凸領域とを含む、レンズ。 A lens that controls the light distribution of incident light.
It has a reflective surface formed in a tubular shape around the optical axis.
The reflecting surface is a lens including an inwardly convex region convex on the optical axis side and an outward convex region convex on the opposite side of the optical axis. 前記反射面は、前記内凸領域および前記外凸領域をそれぞれ１つずつ含み、
前記内凸領域は、前記外凸領域よりも光出射面側に形成されている、請求項１に記載のレンズ。 The reflective surface includes one inner convex region and one outer convex region.
The lens according to claim 1, wherein the inward convex region is formed on the light emitting surface side of the outer convex region. 前記内凸領域および前記外凸領域は、屈曲部が存在しない湾曲面である、請求項１または２に記載のレンズ。 The lens according to claim 1 or 2, wherein the inner convex region and the outer convex region are curved surfaces having no bent portion. 前記外凸領域の曲率半径Ｒ２は、前記内凸領域の曲率半径Ｒ１よりも大きい、請求項３に記載のレンズ。 The lens according to claim 3, wherein the radius of curvature R2 of the outer convex region is larger than the radius of curvature R1 of the inner convex region. 前記内凸領域の面積をＳ１、前記内凸領域の曲率半径をＲ１、前記外凸領域の面積をＳ２、前記外凸領域の曲率半径をＲ２、および前記反射面の最大の直径をφとしたとき、
Ｒ２≧１．５×φ、および
５×φ×（Ｓ１／Ｓ２）2≦Ｒ１≦２５×φ×（Ｓ１／Ｓ２）2、
のうち少なくとも一方の関係を満たす、請求項３または４に記載のレンズ。 The area of the inner convex region is S1, the radius of curvature of the inner convex region is R1, the area of the outer convex region is S2, the radius of curvature of the outer convex region is R2, and the maximum diameter of the reflecting surface is φ. When
R2 ≧ 1.5 × φ, and 5 × φ × (S1 / S2) 2 ≦ R1 ≦ 25 × φ × (S1 / S2) 2 ,
The lens according to claim 3 or 4, which satisfies at least one of the relationships. 前記外凸領域の面積Ｓ２は、前記内凸領域の面積Ｓ１よりも大きい、請求項１〜５のいずれか１項に記載のレンズ。 The lens according to any one of claims 1 to 5, wherein the area S2 of the outer convex region is larger than the area S1 of the inner convex region. 請求項１〜６のいずれか１項に記載のレンズと、
光源と、
を備え、前記レンズの光軸方向に沿って前記レンズと前記光源の距離を変更可能に構成された、照明器具。 The lens according to any one of claims 1 to 6.
Light source and
A luminaire comprising the lens and capable of changing the distance between the lens and the light source along the optical axis direction of the lens.
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