JP2014183269A - Wavelength converter - Google Patents

Wavelength converter Download PDF

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JP2014183269A
JP2014183269A JP2013058162A JP2013058162A JP2014183269A JP 2014183269 A JP2014183269 A JP 2014183269A JP 2013058162 A JP2013058162 A JP 2013058162A JP 2013058162 A JP2013058162 A JP 2013058162A JP 2014183269 A JP2014183269 A JP 2014183269A
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wavelength conversion
light
scattering
scattering member
conversion member
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JP6122674B2 (en
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Wakako Shinno
和香子 新野
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Stanley Electric Co Ltd
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Stanley Electric Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a high performance wavelength converter capable of efficiently converting a wavelength of light incident from a light-emitting element and emitting light free from color nonuniformity.SOLUTION: A wavelength converter 23 includes: a support body 25 having a light incident hole 35; a light scattering member 27 mounted on the support body 25 so as to cover the light incident hole 35; and a wavelength conversion member 29 mounted on the light scattering member 27. The wavelength conversion member 29 ranges from an outer edge of the light scattering member 27 to an outside in a top view.

Description

本発明は、レーザーダイオード（ＬＤ：Laser Diode）素子等の発光素子とともに使用する波長変換装置に関する。 The present invention relates to a wavelength converter used with a light emitting element such as a laser diode (LD) element.

ＬＤ素子を搭載した発光装置が、ＣＤやＤＶＤ等の光学ドライブの光ピックアップ、コピー機やレーザープリンター等に従来から用いられてきた。近年では、自動車の前照灯等の自動車用照明にも利用されている。特許文献１には、ＬＤ素子からの発光を、波長変換材を含む透光性部材によって例えば白色に変換する発光装置が示されている。   A light emitting device equipped with an LD element has been conventionally used for an optical pickup of an optical drive such as a CD or DVD, a copier, a laser printer, or the like. In recent years, it is also used for automobile lighting such as automobile headlamps. Patent Document 1 discloses a light emitting device that converts light emitted from an LD element into, for example, white using a translucent member including a wavelength conversion material.

特開２０１０−１６５８３４号公報JP 2010-165834 A

特許文献１に示す発光装置においては、ＬＤ素子から出射され、レンズによって集光されたレーザ光が、波長変換層に直接入射してしまうために、波長変換層での光の波長変換が十分になされず、発光装置からの出射光に色ムラが発生していた。
本発明は、上述した点に鑑みてなされたものであり、発光素子から入射した光を効率良く波長変換し、色ムラの無い光を出射させることが可能な高性能な波長変換装置を提供することを目的とする。 In the light emitting device shown in Patent Document 1, since the laser light emitted from the LD element and collected by the lens is directly incident on the wavelength conversion layer, the wavelength conversion of the light in the wavelength conversion layer is sufficiently performed. This was not done, and color unevenness occurred in the light emitted from the light emitting device.
The present invention has been made in view of the above-described points, and provides a high-performance wavelength conversion device capable of efficiently converting the wavelength of light incident from a light emitting element and emitting light without color unevenness. For the purpose.

本発明の波長変換装置は、光入射孔を有する保持体と、当該保持体上に当該光入射孔を覆うように搭載されている散乱部材と、当該散乱部材上に載置されている波長変換部材と、を有し、当該波長変換部材は、上面視において当該散乱部材の外縁より外側にまで及んでいることを特徴とする。   The wavelength conversion device of the present invention includes a holding body having a light incident hole, a scattering member mounted on the holding body so as to cover the light incident hole, and a wavelength conversion placed on the scattering member. The wavelength converting member extends to the outside from the outer edge of the scattering member in a top view.

実施例１の発光装置の断面図である。2 is a cross-sectional view of the light emitting device of Example 1. FIG. 実施例１の波長変換装置の上面図である。FIG. 3 is a top view of the wavelength conversion device according to the first embodiment. 図２Ａの２Ｂ−２Ｂ線に沿った断面図である。It is sectional drawing along the 2B-2B line | wire of FIG. 2A. 実施例２の波長変換装置の断面図である。It is sectional drawing of the wavelength converter of Example 2. 実施例３の波長変換装置の断面図である。It is sectional drawing of the wavelength converter of Example 3. 実施例４の波長変換装置の断面図である。It is sectional drawing of the wavelength converter of Example 4. 実施例５の波長変換装置の断面図である。It is sectional drawing of the wavelength converter of Example 5. 他の実施例の波長変換装置の断面図である。It is sectional drawing of the wavelength converter of another Example.

以下に、本発明の実施例１に係る発光装置１０について、図１を参照しつつ説明する。図１は、発光装置１０の断面図である。図１において、発光装置１０内の後述する発光素子から出射し、後述する散乱部材に入射する光の経路を、実線矢印で示している。また、発光素子の出射光の光軸をａｘとしている。   Below, the light-emitting device 10 which concerns on Example 1 of this invention is demonstrated, referring FIG. FIG. 1 is a cross-sectional view of the light emitting device 10. In FIG. 1, a solid line arrow indicates a path of light emitted from a light emitting element described later in the light emitting device 10 and incident on a scattering member described later. Further, the optical axis of the emitted light from the light emitting element is ax.

支持体１１は、ステム１３を支持する第１の内壁部１１ａ、第１の内壁部の上方領域に配されておりレンズ１５を支持する第２の内壁部１１ｂ、及び第２の内壁部の上方領域に配されており筒部材１７を支持する第３の内壁部１１ｃを有する中空円筒形状を有している。   The support body 11 is disposed in the upper region of the first inner wall portion 11a that supports the stem 13, the second inner wall portion 11b that supports the lens 15, and is located above the second inner wall portion. It has a hollow cylindrical shape having a third inner wall portion 11 c that is arranged in the region and supports the cylindrical member 17.

ステム１３は、円盤状のステム底部１８及びステム底部１８の上面から突出している柱状のステム柱体１９からなっている。発光素子２１は、青色レーザ光（例えば、波長４６０ｎｍ程度）を出射する青色ＬＤ素子であり、ステム柱体１９の側面に、上方に向けてレーザ光を出射するように配されている。ステム柱体１９の上方には、レンズ１５が配されている。レンズ１５は、発光素子２１から出射した光を収束する、例えば凸レンズである。   The stem 13 includes a disc-shaped stem bottom 18 and a columnar stem column 19 projecting from the upper surface of the stem bottom 18. The light emitting element 21 is a blue LD element that emits blue laser light (for example, a wavelength of about 460 nm), and is arranged on the side surface of the stem column 19 so as to emit laser light upward. A lens 15 is disposed above the stem column body 19. The lens 15 is, for example, a convex lens that converges the light emitted from the light emitting element 21.

円筒部材１７は、レンズ１５の上方に配されレンズ１５によって収束された光が通過する中空部を有する円筒形の筒部材である。円筒部材１７上には、波長変換装置２３が配置されている。   The cylindrical member 17 is a cylindrical cylindrical member having a hollow portion that is disposed above the lens 15 and through which light converged by the lens 15 passes. A wavelength conversion device 23 is disposed on the cylindrical member 17.

図２Ａ波長変換装置の上面図を示し、図２Ｂに図２Ａの波長変換装置２３の２Ｂ−２Ｂ線に沿った断面図を示す。波長変換装置２３は、保持体２５、保持体２５によって保持されている散乱部材２７、波長変換部材２９及び反射部材３１からなっている。保持体２５は、例えば略円盤状であり、上面に凹部３３を有している。凹部３３の中央には、レンズ１５によって集光された光が通過する光入射孔３５が形成されている。光入射孔３５は、レンズ１５によって集光された光が通過できるならば、円状、矩形状、楕円状等任意の形状とすることが可能である。   2A shows a top view of the wavelength conversion device, and FIG. 2B shows a cross-sectional view of the wavelength conversion device 23 of FIG. 2A along line 2B-2B. The wavelength conversion device 23 includes a holding body 25, a scattering member 27 held by the holding body 25, a wavelength conversion member 29, and a reflection member 31. The holding body 25 has, for example, a substantially disk shape, and has a recess 33 on the upper surface. A light incident hole 35 through which the light condensed by the lens 15 passes is formed at the center of the recess 33. The light incident hole 35 may have an arbitrary shape such as a circular shape, a rectangular shape, or an elliptical shape as long as the light collected by the lens 15 can pass therethrough.

散乱部材２７は、凹部３３の底面の中央部に、光入射孔３５を塞ぐように搭載されている下面が半径ｒ1の円である円柱形の部材である。散乱部材２７は、シリカ、アルミナ、チタニア等からなる光散乱粒子を含んでいる透光性セラミック材（ガラス、石英、アルミナ等）、またはシリコーン樹脂もしくはエポキシ樹脂等の透光性材料からなっている。散乱部材２７と凹部３３の底面とは、例えばシリコーン樹脂接着材等の透明接着材によって固定されている。レンズ１５によって収束されて光入射孔３５を通過した光は、散乱部材２７に達し、散乱部材２７内の光散乱粒子によって散乱される。 The scattering member 27 is a cylindrical member whose lower surface is a circle having a radius r 1 mounted on the center of the bottom surface of the recess 33 so as to block the light incident hole 35. The scattering member 27 is made of a translucent ceramic material (glass, quartz, alumina, etc.) containing light scattering particles made of silica, alumina, titania or the like, or a translucent material such as silicone resin or epoxy resin. . The scattering member 27 and the bottom surface of the recess 33 are fixed by a transparent adhesive such as a silicone resin adhesive. The light converged by the lens 15 and passed through the light incident hole 35 reaches the scattering member 27 and is scattered by the light scattering particles in the scattering member 27.

波長変換部材２９は、散乱部材２７上に載置されている。波長変換部材２９は、下面が散乱部材２７の半径ｒ1よりも大きい半径ｒ2（すなわち、ｒ2＞ｒ1）の円である円柱形の部材である。すなわち、波長変換部材２９は、光出射方向からみた上面視、すなわちレーザ光の光軸ａｘに沿った方向から見た上面視において散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいる。波長変換部材２９は、例えばＹＡＧ（イットリウム・アルミニウム・ガーネット：Ｙ3Ａｌ5Ｏ12）に付活剤としてＣｅ（セリウム）を導入したＹＡＧ：Ｃｅ蛍光体等からなる黄色蛍光体粒子を含んでいるガラス、シリコーン樹脂またはエポキシ樹脂等の透光性材料からなっている。波長変換部材２９と散乱部材２７との固定には、例えば、シリコーン樹脂接着材、ガラス接着材等の透明接着材が用いられている。 The wavelength conversion member 29 is placed on the scattering member 27. The wavelength conversion member 29 is a cylindrical member whose lower surface is a circle having a radius r 2 (ie, r 2 > r 1 ) larger than the radius r 1 of the scattering member 27. In other words, the wavelength conversion member 29 is larger than the scattering member 27 in the top view as viewed from the light emitting direction, that is, as viewed from the direction along the optical axis ax of the laser light, and extends outward from the outer edge of the scattering member 27. It extends. The wavelength conversion member 29 includes, for example, yellow phosphor particles made of YAG: Ce phosphor or the like obtained by introducing Ce (cerium) as an activator into YAG (yttrium, aluminum, garnet: Y 3 Al 5 O 12 ). It consists of translucent materials, such as glass, a silicone resin, or an epoxy resin. For fixing the wavelength conversion member 29 and the scattering member 27, for example, a transparent adhesive such as a silicone resin adhesive or a glass adhesive is used.

黄色蛍光体は、発光素子２１から発せられ、散乱部材２７を通過して散乱された光、例えば、約４６０ｎｍの青色励起光を吸収して、約５６０ｎｍの発光ピーク波長を有する黄色光を発する。従って、発光素子２１から発せられて蛍光体に吸収されなかった青色光と蛍光体から発せられる黄色光とが混ざり合うことによって白色光が得られる。   The yellow phosphor emits light emitted from the light emitting element 21 and scattered through the scattering member 27, for example, blue excitation light of about 460 nm and emits yellow light having an emission peak wavelength of about 560 nm. Therefore, white light is obtained by mixing the blue light emitted from the light emitting element 21 and not absorbed by the phosphor and the yellow light emitted from the phosphor.

反射部材３１は、散乱部材２７及び波長変換部材２９の側面を覆うように凹部３３内に充填されている。反射部材３１は、シリカ、アルミナ、チタニア等からなる光散乱粒子を含んでいるシリコーン樹脂またはエポキシ樹脂等からなっている。反射部材３１をシリコーン樹脂等の樹脂材で形成する場合、凹部３３内に散乱部材２７及び波長変換部材２９を配置した後に、凹部３３の内側面と散乱部材２７及び波長変換部材２９の側面との間に、反射部材３１を形成する光散乱粒子を含む樹脂材をポッティングして、加熱硬化することで反射部材３１を形成してもよい。なお、散乱部材２７及び波長変換部材２９から反射部材３１方向に向かう光が、散乱部材２７及び波長変換部材２９と反射部材３１との界面において全反射して、反射部材３１内にできるだけ漏れ出すことのないようにするため、反射部材３１を形成する材料の屈折率を、散乱部材２７及び波長変換部材２９を形成する材料の屈折率より小さくすることが好ましい。   The reflecting member 31 is filled in the recess 33 so as to cover the side surfaces of the scattering member 27 and the wavelength conversion member 29. The reflecting member 31 is made of a silicone resin or an epoxy resin containing light scattering particles made of silica, alumina, titania or the like. When the reflecting member 31 is formed of a resin material such as silicone resin, after the scattering member 27 and the wavelength conversion member 29 are disposed in the recess 33, the inner surface of the recess 33 and the side surfaces of the scattering member 27 and the wavelength conversion member 29 are arranged. In the meantime, the reflecting member 31 may be formed by potting a resin material containing light scattering particles forming the reflecting member 31 and heat-curing it. The light traveling from the scattering member 27 and the wavelength conversion member 29 toward the reflection member 31 is totally reflected at the interface between the scattering member 27 and the wavelength conversion member 29 and the reflection member 31 and leaks into the reflection member 31 as much as possible. Therefore, it is preferable to make the refractive index of the material forming the reflecting member 31 smaller than the refractive index of the material forming the scattering member 27 and the wavelength conversion member 29.

発光装置１０の波長変換装置２３においては、発光素子２１から出射して、レンズ１５によって集光された青色レーザ光（図中実線矢印）が、散乱部材２７において散乱されてから波長変換部材２９に入射するので、励起光（青色光）によって波長変換部材２９内の蛍光体が均一に効率良く励起され、かつ励起光と蛍光が良好に混合され、色ムラのない白色光を得ることが可能である。   In the wavelength conversion device 23 of the light emitting device 10, the blue laser light (solid arrow in the figure) emitted from the light emitting element 21 and condensed by the lens 15 is scattered by the scattering member 27 and then is applied to the wavelength conversion member 29. Since the light is incident, the phosphor in the wavelength conversion member 29 is uniformly and efficiently excited by the excitation light (blue light), and the excitation light and the fluorescence are well mixed to obtain white light with no color unevenness. is there.

また、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいるので、図中破線で示すような散乱部材２７から散乱部材２７の周囲の反射部材３１に漏洩した光も波長変換部材２９を通過させることが可能となり、波長変換部材２９を通過しないで発光装置から出射する青色励起光に起因する出射光の色ムラを防止することが可能である。   In addition, since the wavelength conversion member 29 is larger than the scattering member 27 and extends to the outside of the outer edge of the scattering member 27 in a top view, the reflection from the scattering member 27 to the periphery of the scattering member 27 as indicated by a broken line in the figure. Light that has leaked into the member 31 can also pass through the wavelength conversion member 29, and color unevenness of the emitted light caused by the blue excitation light emitted from the light emitting device without passing through the wavelength conversion member 29 can be prevented. is there.

上面視における波長変換部材２９の半径ｒ2は、例えば、拡散部材２７からの漏れ光が光出射面のどれくらいの領域にまで到達するか、及び波長変換材２９を通過せずに出射面から出る青色光をどの程度低減するのかによって決定されてもよい。例えば、青色光が波長変換材２９を通過せずに出射面から出ることを完全に防止したいならば、上面視において、波長変換部材２９の中心から漏れ光が到達する領域の最外縁までの距離（ここではｒ3とする）をｒ2（すなわち、ｒ2＝ｒ3）とすればよいし、青色光が波長変換材２９を通過せずに出射面から出ることを部分的に防止したいならば、その程度に応じて、ｒ2をｒ1＜ｒ2＜ｒ3となる任意の値とすればよい。 The radius r 2 of the wavelength conversion member 29 in the top view is, for example, how far the leakage light from the diffusing member 27 reaches the light emission surface, and exits from the emission surface without passing through the wavelength conversion material 29. It may be determined by how much blue light is reduced. For example, if it is desired to completely prevent blue light from exiting the exit surface without passing through the wavelength conversion material 29, the distance from the center of the wavelength conversion member 29 to the outermost edge of the region where the leaked light reaches in the top view. (Here, r 3 ) may be r 2 (ie, r 2 = r 3 ), and it is desired to partially prevent the blue light from exiting the exit surface without passing through the wavelength conversion material 29. For example, r 2 may be set to an arbitrary value satisfying r 1 <r 2 <r 3 according to the degree.

以下に、本発明の実施例２について、図３を用いて説明する。図３は、実施例２の発光装置１０の波長変換装置２３の断面図である。実施例２の発光装置１０は、波長変換装置２３の波長変換部材２９の形状が異なる以外は、実施例１の発光装置１０と同様の構造を有している。   A second embodiment of the present invention will be described below with reference to FIG. FIG. 3 is a cross-sectional view of the wavelength conversion device 23 of the light emitting device 10 according to the second embodiment. The light-emitting device 10 of Example 2 has the same structure as the light-emitting device 10 of Example 1 except that the shape of the wavelength conversion member 29 of the wavelength conversion device 23 is different.

図３に示すように、実施例２の発光装置１０の波長変換装置２３において、波長変換部材２９は、散乱部材２７への載置面である下面よりも上面が大きい逆円錐台形状を有しており、下面が散乱部材２７の上面と同一の形状を有している。すなわち、波長変換部材２９の側面２９ａが上方に向かって広がっている形状を有している。また、実施例１と同様に、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいる。   As shown in FIG. 3, in the wavelength conversion device 23 of the light emitting device 10 according to the second embodiment, the wavelength conversion member 29 has an inverted truncated cone shape whose upper surface is larger than the lower surface that is the mounting surface on the scattering member 27. The lower surface has the same shape as the upper surface of the scattering member 27. That is, the side surface 29a of the wavelength conversion member 29 has a shape that widens upward. Similarly to the first embodiment, the wavelength conversion member 29 is larger than the scattering member 27 in the top view and extends outside the outer edge of the scattering member 27.

波長変換部材２９をこのような形状とすることで、実施例１と同様に散乱部材２７から散乱部材２７の周囲の反射部材３１に漏洩した光も波長変換部材２９を通過させることが可能となり、波長変換部材２９を通過しないで発光装置から出射する青色励起光に起因する出射光の色ムラを防止することが可能である。   By making the wavelength conversion member 29 in such a shape, the light leaking from the scattering member 27 to the reflection member 31 around the scattering member 27 can pass through the wavelength conversion member 29 as in the first embodiment. It is possible to prevent color unevenness of the emitted light caused by the blue excitation light emitted from the light emitting device without passing through the wavelength conversion member 29.

また、波長変換部材２９より反射部材３１の屈折率が低い場合に、波長変換部材２９に入射した光の波長変換部材２９の側面２９ａへの入射角が大きくなり、側面２９ａにおいて全反射が発生しやすくなる。それによって、波長変換部材２９に入射した光を、光の出射方向である波長変換装置２３の上方により良好に出射することができ、波長変換装置２３の光取り出し効率を向上させることが可能となる。さらに、反射部材３１を樹脂のポッティングによって形成する場合において、ポッティングした樹脂が、波長変換部材２９の上面にまで這い上がることを防止し、製品の歩留まりを向上させることができる。   Further, when the refractive index of the reflecting member 31 is lower than that of the wavelength converting member 29, the incident angle of the light incident on the wavelength converting member 29 to the side surface 29a of the wavelength converting member 29 is increased, and total reflection occurs on the side surface 29a. It becomes easy. Thereby, the light incident on the wavelength conversion member 29 can be emitted more favorably above the wavelength conversion device 23 that is the light emission direction, and the light extraction efficiency of the wavelength conversion device 23 can be improved. . Further, when the reflecting member 31 is formed by resin potting, it is possible to prevent the potted resin from climbing up to the upper surface of the wavelength conversion member 29 and to improve the product yield.

なお、実施例２においては、波長変換部材２９の下面が散乱部材２７の上面と同一形状であることとしたが、波長変換部材２９の下面が散乱部材２７の上面よりも大きくともよい。   In the second embodiment, the lower surface of the wavelength conversion member 29 has the same shape as the upper surface of the scattering member 27, but the lower surface of the wavelength conversion member 29 may be larger than the upper surface of the scattering member 27.

以下に、本発明の実施例３について、図４を用いて説明する。図４は、実施例３の発光装置１０の波長変換装置２３の断面図である。実施例３の発光装置１０は、波長変換装置２３の散乱部材２７及び波長変換部材２９の構成が異なる以外は、実施例１の発光装置１０と同様の構造を有している。   The third embodiment of the present invention will be described below with reference to FIG. FIG. 4 is a cross-sectional view of the wavelength conversion device 23 of the light emitting device 10 according to the third embodiment. The light emitting device 10 of Example 3 has the same structure as the light emitting device 10 of Example 1 except that the configurations of the scattering member 27 and the wavelength conversion member 29 of the wavelength conversion device 23 are different.

図４に示すように、実施例３の発光装置１０の波長変換装置２３において、散乱部材２７は、保持体２５への搭載面である下面よりも上面が大きい逆円錐台形状を有している。すなわち、散乱部材２７の側面２７ａが上方に向かって広がっている形状を有している。また、波長変換部材２９も、散乱部材２７への載置面である下面よりも上面が大きい逆円錐台形状を有しており、下面が散乱部材２７の上面と同一の形状を有している。すなわち、波長変換部材２９の側面２９ａが上方に向かって広がっている形状を有している。また、実施例１と同様に、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいる。   As shown in FIG. 4, in the wavelength conversion device 23 of the light emitting device 10 of Example 3, the scattering member 27 has an inverted frustoconical shape whose upper surface is larger than the lower surface that is the mounting surface to the holding body 25. . That is, the side surface 27a of the scattering member 27 has a shape that spreads upward. The wavelength conversion member 29 also has an inverted frustoconical shape whose upper surface is larger than the lower surface that is the mounting surface on the scattering member 27, and the lower surface has the same shape as the upper surface of the scattering member 27. . That is, the side surface 29a of the wavelength conversion member 29 has a shape that widens upward. Similarly to the first embodiment, the wavelength conversion member 29 is larger than the scattering member 27 in the top view and extends outside the outer edge of the scattering member 27.

散乱部材２７及び波長変換部材２９をこのような形状とすることで、実施例１と同様に散乱部材２７から散乱部材２７の周囲の反射部材３１に漏洩した光も波長変換部材２９を通過させることが可能となり、波長変換部材２９を通過しないで発光装置から出射する青色励起光に起因する出射光の色ムラを防止することが可能である。   By forming the scattering member 27 and the wavelength conversion member 29 in such a shape, light leaking from the scattering member 27 to the reflection member 31 around the scattering member 27 also passes through the wavelength conversion member 29 as in the first embodiment. Therefore, it is possible to prevent the color unevenness of the emitted light caused by the blue excitation light emitted from the light emitting device without passing through the wavelength conversion member 29.

また、散乱部材２７及び波長変換部材２９より反射部材３１の屈折率が低い場合に、散乱部材２７及び波長変換部材２９に入射した光の側面２７ａ及び側面２９ａへの入射角が大きくなり、側面２７ａ及び側面２９ａにおいて全反射が発生しやすくなる。それによって、散乱部材２７及び波長変換部材２９に入射した光が、光の出射方向である波長変換装置２３の上方により良好に出射されることで、波長変換装置２３の光取り出し効率を向上させることが可能となる。さらに、実施例２の波長変換装置２３と同様に反射部材３１を樹脂のポッティングによって形成する場合において、ポッティングした樹脂が、波長変換部材２９の上面にまで這い上がることを防止し、歩留まりを向上させることができる。   Further, when the refractive index of the reflecting member 31 is lower than that of the scattering member 27 and the wavelength conversion member 29, the incident angle of the light incident on the scattering member 27 and the wavelength conversion member 29 on the side surface 27a and the side surface 29a is increased, and the side surface 27a. In addition, total reflection tends to occur on the side surface 29a. Thereby, the light incident on the scattering member 27 and the wavelength conversion member 29 is emitted more favorably above the wavelength conversion device 23 which is the light emission direction, thereby improving the light extraction efficiency of the wavelength conversion device 23. Is possible. Further, when the reflecting member 31 is formed by resin potting as in the wavelength conversion device 23 of the second embodiment, the potted resin is prevented from creeping up to the upper surface of the wavelength conversion member 29 and the yield is improved. be able to.

なお、実施例３においては、波長変換部材２９の下面が散乱部材２７の上面と同一形状であることとしたが、波長変換部材２９の下面が散乱部材２７の上面よりも大きくともよい。   In the third embodiment, the lower surface of the wavelength conversion member 29 has the same shape as the upper surface of the scattering member 27, but the lower surface of the wavelength conversion member 29 may be larger than the upper surface of the scattering member 27.

以下に、本発明の実施例４について、図５を用いて説明する。図５は、実施例４の発光装置１０の波長変換装置２３の断面図である。実施例４の発光装置１０は、波長変換装置２３の波長変換部材２９の形状が異なる以外は、実施例１の発光装置１０と同様の構造を有している。   Embodiment 4 of the present invention will be described below with reference to FIG. FIG. 5 is a cross-sectional view of the wavelength conversion device 23 of the light emitting device 10 according to the fourth embodiment. The light emitting device 10 of Example 4 has the same structure as the light emitting device 10 of Example 1 except that the shape of the wavelength conversion member 29 of the wavelength conversion device 23 is different.

図５に示すように、実施例３の発光装置１０の波長変換装置２３において、波長変換部材２９は、散乱部材２７への載置面である下面よりも上面が小さい円錐台形状を有しており、下面が散乱部材２７の上面よりも大きな形状を有している。すなわち、波長変換部材２９の側面２９ａが上方に向かって狭まっている形状を有している。また、実施例１と同様に、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいる。   As shown in FIG. 5, in the wavelength conversion device 23 of the light emitting device 10 of Example 3, the wavelength conversion member 29 has a truncated cone shape whose upper surface is smaller than the lower surface that is the mounting surface on the scattering member 27. The lower surface has a shape larger than the upper surface of the scattering member 27. That is, the side surface 29a of the wavelength conversion member 29 has a shape that narrows upward. Similarly to the first embodiment, the wavelength conversion member 29 is larger than the scattering member 27 in the top view and extends outside the outer edge of the scattering member 27.

波長変換部材２９をこのような形状とすることで、実施例１と同様に散乱部材２７から散乱部材２７の周囲の反射部材３１に漏洩した光も波長変換部材２９を通過させることが可能となり、波長変換部材２９を通過しないで発光装置から出射する青色励起光に起因する出射光の色ムラを防止することが可能である。   By making the wavelength conversion member 29 in such a shape, the light leaking from the scattering member 27 to the reflection member 31 around the scattering member 27 can pass through the wavelength conversion member 29 as in the first embodiment. It is possible to prevent color unevenness of the emitted light caused by the blue excitation light emitted from the light emitting device without passing through the wavelength conversion member 29.

また、波長変換部材２９を下面よりも上面が小さい円錐台形状とすることで、実施例１、実施例２及び実施例３の波長変換部材２９と異なり、波長変換部材２９の光出射面である上面をより小さく、例えば、散乱部材２７の上面より小さくすることができるので、より光束密度の高い出射光を得ることが可能となる。   In addition, the wavelength conversion member 29 has a truncated conical shape whose upper surface is smaller than the lower surface, so that the wavelength conversion member 29 is a light emitting surface of the wavelength conversion member 29 unlike the wavelength conversion members 29 of the first, second, and third embodiments. Since the upper surface can be made smaller, for example, smaller than the upper surface of the scattering member 27, it is possible to obtain outgoing light with a higher luminous flux density.

さらに、波長変換部材２９が下面よりも上面が小さい円錐台形状であるので、波長変換部材２９の側面２９ａによって、励起光または蛍光が波長変換部材２９内で複数回反射することによって、励起光と蛍光が良好に混合され、出射光の色ムラがさらに低減され得る。   Furthermore, since the wavelength conversion member 29 has a truncated cone shape whose upper surface is smaller than the lower surface, the side surface 29a of the wavelength conversion member 29 reflects the excitation light or fluorescence multiple times within the wavelength conversion member 29, thereby The fluorescence can be mixed well, and the color unevenness of the emitted light can be further reduced.

以下に、本発明の実施例５について、図６を用いて説明する。図６は、実施例５の発光装置１０の波長変換装置２３の断面図である。実施例５の発光装置１０は、波長変換装置２３の散乱部材２７及び波長変換部材２９の構成が異なる以外は、実施例１の発光装置１０と同様の構造を有している。   Embodiment 5 of the present invention will be described below with reference to FIG. FIG. 6 is a cross-sectional view of the wavelength conversion device 23 of the light emitting device 10 according to the fifth embodiment. The light emitting device 10 of Example 5 has the same structure as that of the light emitting device 10 of Example 1 except that the configurations of the scattering member 27 and the wavelength conversion member 29 of the wavelength conversion device 23 are different.

図６に示すように、実施例５の発光装置１０の波長変換装置２３において、散乱部材２７は、保持体２５への搭載面である下面よりも上面が大きい逆円錐台形状を有している。すなわち、散乱部材２７の側面２７ａが上方に向かって広がっている形状を有している。また、波長変換部材２９は、散乱部材２７への載置面である下面よりも上面が小さい円錐台形状を有しており、下面が散乱部材２７の上面よりも大きくなっている。すなわち、波長変換部材２９の側面２９ａが上方に向かって狭まっている形状を有している。また、実施例１と同様に、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいる。   As shown in FIG. 6, in the wavelength conversion device 23 of the light emitting device 10 of Example 5, the scattering member 27 has an inverted frustoconical shape whose upper surface is larger than the lower surface that is the mounting surface to the holding body 25. . That is, the side surface 27a of the scattering member 27 has a shape that spreads upward. The wavelength conversion member 29 has a truncated cone shape whose upper surface is smaller than the lower surface, which is a mounting surface on the scattering member 27, and the lower surface is larger than the upper surface of the scattering member 27. That is, the side surface 29a of the wavelength conversion member 29 has a shape that narrows upward. Similarly to the first embodiment, the wavelength conversion member 29 is larger than the scattering member 27 in the top view and extends outside the outer edge of the scattering member 27.

散乱部材２７及び波長変換部材２９をこのような形状とすることで、実施例１と同様に散乱部材２７から散乱部材２７の周囲の反射部材３１に漏洩した光も波長変換部材２９を通過させることが可能となり、波長変換部材２９を通過しないで発光装置から出射する青色励起光に起因する出射光の色ムラを防止することが可能である。   By forming the scattering member 27 and the wavelength conversion member 29 in such a shape, light leaking from the scattering member 27 to the reflection member 31 around the scattering member 27 also passes through the wavelength conversion member 29 as in the first embodiment. Therefore, it is possible to prevent the color unevenness of the emitted light caused by the blue excitation light emitted from the light emitting device without passing through the wavelength conversion member 29.

また、散乱部材２７より反射部材３１の屈折率が低い場合に、散乱部材２７に入射した光の側面２７ａへの入射角が大きくなり、側面２７ａにおいて全反射が発生しやすくなる。それによって、散乱部材２７に入射した光が、光の出射方向である波長変換装置２３の上方に向けて良好に出射されることで、波長変換装置２３の光取り出し効率を向上させることが可能となる。さらに、波長変換部材２９を下面よりも上面が小さい円錐台形状とすることで、実施例１、実施例２及び実施例３の波長変換部材２９と異なり、波長変換部材２９の光出射面である上面をより小さく、例えば、散乱部材２７の上面より小さくすることができるので、より光束密度の高い出射光を得ることが可能となる。   Further, when the refractive index of the reflecting member 31 is lower than that of the scattering member 27, the incident angle of the light incident on the scattering member 27 on the side surface 27a is increased, and total reflection is likely to occur on the side surface 27a. As a result, the light incident on the scattering member 27 is favorably emitted toward the upper side of the wavelength conversion device 23, which is the light emission direction, so that the light extraction efficiency of the wavelength conversion device 23 can be improved. Become. Further, the wavelength conversion member 29 is formed in a truncated cone shape whose upper surface is smaller than the lower surface, so that the wavelength conversion member 29 is a light emitting surface of the wavelength conversion member 29 unlike the wavelength conversion members 29 of the first, second, and third embodiments. Since the upper surface can be made smaller, for example, smaller than the upper surface of the scattering member 27, it is possible to obtain outgoing light with a higher luminous flux density.

また、波長変換部材２９が下面よりも上面が小さい円錐台形状であるので、波長変換部材２９の側面２９ａによって、励起光または蛍光が波長変換部材２９内で複数回反射されることによって、励起光と蛍光が良好に混合され、出射光の色ムラがさらに低減され得る。   In addition, since the wavelength conversion member 29 has a truncated cone shape whose upper surface is smaller than the lower surface, the excitation light or fluorescence is reflected in the wavelength conversion member 29 a plurality of times by the side surface 29 a of the wavelength conversion member 29. And fluorescence can be mixed well, and the color unevenness of the emitted light can be further reduced.

上記実施例において、散乱部材２７及び波長変換部材２９は、円柱状または円錐台状としたが、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいるという条件が満たされるならば、散乱部材２７及び波長変換部材２９が他の形状をとることとしてもよい。例えば、矩形等の多角形状の光出射面を形成したい場合には、散乱部材２７及び波長変換部材２９を角柱状または角錐台状とし、楕円形状の光出射面を形成したい場合には、楕円柱状または楕円錐台状とする等、散乱部材２７及び波長変換部材２９は任意の形状とすることができる。   In the above embodiment, the scattering member 27 and the wavelength conversion member 29 are formed in a columnar shape or a truncated cone shape. However, the wavelength conversion member 29 is larger than the scattering member 27 in the top view and extends to the outside of the outer edge of the scattering member 27. The scattering member 27 and the wavelength conversion member 29 may have other shapes as long as the condition of reaching is satisfied. For example, when it is desired to form a polygonal light exit surface such as a rectangle, the scattering member 27 and the wavelength conversion member 29 are in the shape of a prism or truncated pyramid, and when it is desired to form an elliptical light exit surface, an elliptical column Alternatively, the scattering member 27 and the wavelength conversion member 29 can have any shape, such as an elliptic frustum shape.

また、上記実施例において、波長変換部材２９の上面及び／または下面が散乱部材２７の上面よりも大きいこととしたが、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいるならば、波長変換部材２９の上面及び／または下面が散乱部材２７の上面よりも大きくともよい。例えば、図７に示すように、波長変換部材２９を、高さ方向における中央部において膨らんだ形状とすることで、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の周囲にまで及んでいる構成としてもよい。   In the above embodiment, the upper surface and / or the lower surface of the wavelength conversion member 29 is larger than the upper surface of the scattering member 27. However, the wavelength conversion member 29 is larger than the scattering member 27 in the top view, and The upper surface and / or the lower surface of the wavelength conversion member 29 may be larger than the upper surface of the scattering member 27 as long as it extends outside the outer edge. For example, as shown in FIG. 7, the wavelength conversion member 29 has a shape that swells at the center in the height direction, so that the wavelength conversion member 29 is larger than the scattering member 27 in the top view, and the periphery of the scattering member 27. It is good also as a structure which extends to.

また、上記実施例においては、散乱部材２７は、光散乱粒子を含んでいるものとしたが、セラミック、透光性樹脂、またはガラス等の透光性材料の表面に粗し加工したものを散乱部材として用いてもよい。   Moreover, in the said Example, although the scattering member 27 shall contain the light-scattering particle, it scattered the thing roughened on the surface of translucent materials, such as a ceramic, translucent resin, or glass. It may be used as a member.

また、上記実施例においては、散乱部材２７及び波長変換部材２９の側面を覆うように反射部材３１を配することとしたが、反射部材３１はなくともよい。反射部材３１が無い場合でも、上面視において波長変換部材２９が散乱部材２７よりも大きく、散乱部材２７の外縁よりも外側にまで及んでいる構成とすることで、散乱部材２７から散乱部材２７の周囲に漏洩した光も波長変換部材２９を通過させることが可能となり、波長変換部材２９を通過しないで発光装置から出射する青色励起光に起因する出射光の色ムラを防止することが可能である。   In the above embodiment, the reflecting member 31 is disposed so as to cover the side surfaces of the scattering member 27 and the wavelength converting member 29. However, the reflecting member 31 may not be provided. Even when there is no reflecting member 31, the wavelength conversion member 29 is larger than the scattering member 27 in the top view and extends to the outside of the outer edge of the scattering member 27, so that the scattering member 27 to the scattering member 27. Light that has leaked to the surroundings can also pass through the wavelength conversion member 29, and color unevenness of the emitted light due to the blue excitation light emitted from the light emitting device without passing through the wavelength conversion member 29 can be prevented. .

また、上記実施例においては、青色発光素子及び黄色蛍光体を用いて白色光を得るものとしたが、発光素子の発光色と蛍光体の蛍光色は得るべき出射光の色及び用途等によって任意に選択可能である。   In the above embodiment, the blue light emitting element and the yellow phosphor are used to obtain white light. However, the emission color of the light emitting element and the fluorescent color of the phosphor are arbitrary depending on the color of the emitted light to be obtained and the application. Can be selected.

また、上記実施例においては、発光素子としてＬＤ素子を用いる場合を例にして説明したが、ＬＥＤ素子等他の発光素子を用いることとしてもよい。   Moreover, in the said Example, although the case where LD element was used as a light emitting element was demonstrated as an example, it is good also as using other light emitting elements, such as a LED element.

上述した実施例における種々の数値、寸法、材料等は、例示に過ぎず、用途及び使用される発光素子等に応じて、適宜選択することができる。   Various numerical values, dimensions, materials, and the like in the above-described embodiments are merely examples, and can be appropriately selected according to the application and the light-emitting element used.

１０ 発光装置
１１ 支持体
１３ ステム
１５ レンズ
１７ 円筒部材
１８ ステム底部
１９ ステム柱体
２１ 発光素子
２３ 波長変換装置
２５ 保持体
２７ 散乱部材
２９ 波長変換部材
３１ 反射部材
３３ 凹部
３５ 光入射孔 DESCRIPTION OF SYMBOLS 10 Light-emitting device 11 Support body 13 Stem 15 Lens 17 Cylindrical member 18 Stem bottom part 19 Stem pillar 21 Light-emitting element 23 Wavelength conversion device 25 Holding body 27 Scattering member 29 Wavelength conversion member 31 Reflective member 33 Recessed part 35 Light incident hole

Claims (6)

光入射孔を有する保持体と、
前記保持体上に前記光入射孔を覆うように搭載されている散乱部材と、
前記散乱部材上に載置されている波長変換部材と、を有し、
前記波長変換部材は、上面視において前記散乱部材の外縁より外側にまで及んでいることを特徴とする波長変換装置。 A holder having a light incident hole;
A scattering member mounted on the holding body so as to cover the light incident hole;
A wavelength converting member placed on the scattering member,
The wavelength conversion device, wherein the wavelength conversion member extends to the outside from the outer edge of the scattering member in a top view. 前記波長変換部材は、前記散乱部材上への載置面が前記載置面に対向する面よりも小さい逆錐台形状を有していることを特徴とする請求項１に記載の波長変換装置。   2. The wavelength conversion device according to claim 1, wherein the wavelength conversion member has an inverted frustum shape in which a placement surface on the scattering member is smaller than a surface facing the placement surface. . 前記散乱部材は、前記保持体上への搭載面が前記搭載面に対向する面よりも小さい逆錐台形状を有していることを特徴とする請求項２に記載の波長変換装置。   The wavelength conversion device according to claim 2, wherein the scattering member has an inverted frustum shape in which a mounting surface on the holding body is smaller than a surface facing the mounting surface. 前記波長変換部材は、前記散乱部材上への載置面が前記載置面に対向する面よりも大きい錐台形状を有していることを特徴とする請求項１に記載の波長変換装置。   The wavelength conversion device according to claim 1, wherein the wavelength conversion member has a frustum shape in which a placement surface on the scattering member is larger than a surface facing the placement surface. 前記散乱部材は、前記保持体上への搭載面が前記搭載面に対向する面よりも小さい逆錐台形状を有し、前記波長変換部材は、前記散乱部材上への載置面が前記載置面に対向する面よりも大きい錐台形状を有していることを特徴とする請求項１に記載の波長変換装置。   The scattering member has an inverted frustum shape in which a mounting surface on the holding body is smaller than a surface facing the mounting surface, and the wavelength conversion member has a mounting surface on the scattering member as described above. The wavelength conversion device according to claim 1, wherein the wavelength conversion device has a frustum shape larger than a surface facing the mounting surface. 前記波長変換部材の前記載置面は前記散乱部材の前記搭載面に対向する面よりも大きいことを特徴とする請求項１乃至３のいずれか１に記載の波長変換装置。   4. The wavelength conversion device according to claim 1, wherein the placement surface of the wavelength conversion member is larger than a surface of the scattering member facing the mounting surface. 5.
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