JP5124908B2 - Light emitting device - Google Patents

Light emitting device Download PDF

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JP5124908B2
JP5124908B2 JP2005126193A JP2005126193A JP5124908B2 JP 5124908 B2 JP5124908 B2 JP 5124908B2 JP 2005126193 A JP2005126193 A JP 2005126193A JP 2005126193 A JP2005126193 A JP 2005126193A JP 5124908 B2 JP5124908 B2 JP 5124908B2
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light
emitting device
light guide
guide member
end portion
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JP2006303352A (en
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卓史 杉山
幸宏 林
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Nichia Corp
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Nichia Corp
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Priority to JP2005126193A priority Critical patent/JP5124908B2/en
Priority to CN2005101289819A priority patent/CN1789795B/en
Priority to CN2009101644611A priority patent/CN101630813B/en
Priority to EP05257760.8A priority patent/EP1672755B1/en
Priority to US11/306,106 priority patent/US7356054B2/en
Publication of JP2006303352A publication Critical patent/JP2006303352A/en
Priority to US12/016,803 priority patent/US7591575B2/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0653—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements with wavelength conversion

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  • Light Guides In General And Applications Therefor (AREA)
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Description

本発明は、発光素子と屈曲可能に延長した導光部材と透光性部材とを有する発光装置に関する。   The present invention relates to a light emitting device including a light emitting element, a light guide member extended in a bendable manner, and a light transmissive member.

従来から、高い出力で色情報が正確に再現されるような発光装置が求められている。今日では、その光源として、発光ダイオード（以下「ＬＥＤ」ともいう。）、レーザダイオード（以下「ＬＤ」ともいう。）などの発光素子を用いることが提案されている（例えば、特許文献１）。   Conventionally, there has been a demand for a light emitting device capable of accurately reproducing color information with high output. Today, it has been proposed to use a light emitting element such as a light emitting diode (hereinafter also referred to as “LED”) or a laser diode (hereinafter also referred to as “LD”) as the light source (for example, Patent Document 1).

ＬＥＤやＬＤは、小型で電力効率が良く、鮮やかな色で発光し、球切れなどの心配がない。特に、ＬＤは、ＬＥＤよりも発光出力が極めて高いため、より明るい発光装置を実現することができる。   LEDs and LDs are small and power efficient, emit light in vivid colors, and do not worry about running out of balls. In particular, since the LD has a much higher light emission output than the LED, a brighter light emitting device can be realized.

特表２００３−５１５８９９号公報Special table 2003-515899 gazette

しかしながら、ＬＥＤやＬＤからの光をエポキシ樹脂などの透光性部材を介して外部に放出する際、透光性部材が光に起因する熱により劣化してしまい、発光素子からの光を十分に外部に放出できなくなったり、場合によっては透光性部材が変色してしまい発光装置として使用できなくなったりするなどの問題があった。   However, when the light from the LED or LD is emitted to the outside through a translucent member such as an epoxy resin, the translucent member is deteriorated by the heat caused by the light, and the light from the light emitting element is sufficiently absorbed. There is a problem that it cannot be emitted to the outside, or in some cases, the translucent member is discolored and cannot be used as a light emitting device.

本発明は、上記課題を解決するためのものであり、高出力かつ長寿命の発光装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object thereof is to provide a light-emitting device with high output and long life.

本発明は、発光素子と、発光素子からの光を入射する入射端部及び出射する出射端部を備え屈曲可能に延長した導光部材と、導光部材から出射された光を透過する透光性部材とを有する発光装置において、導光部材の出射端部側における側面を被覆するとともに導光部材の出射端部の少なくとも一部を底部とした凹部の側壁となる被覆部材を有し、透光性部材が被覆部材の端部の少なくとも一部に配置され、凹部に延在していることを特徴とする。
透光性部材は、被覆部材の端部の全部に配置されていることを特徴とする。
導光部材は、出射端面が円錐状に凹んでいることを特徴とする。 The present invention relates to a light-emitting element, a light guide member that includes an incident end portion that emits light from the light-emitting element, and an exit end portion that emits light, and bendably extended, and a translucent light that transmits light emitted from the light guide member A light emitting device having a light-sensitive member includes a covering member that covers a side surface of the light guide member on the emission end portion side and that serves as a side wall of a recess having at least a part of the light emission end portion of the light guide member as a bottom. The optical member is disposed on at least a part of the end portion of the covering member and extends in the recess.
The translucent member is arranged at the entire end of the covering member.
The light guide member is characterized in that the emission end face is recessed in a conical shape.

被覆部材は、透光性部材よりも熱伝導率が高いことが好ましい。   The covering member preferably has a higher thermal conductivity than the translucent member.

透光性部材は、発光素子からの光を異なる波長域に変換する波長変換部材を有することが好ましい。   The translucent member preferably has a wavelength conversion member that converts light from the light emitting element into different wavelength regions.

発光素子は、レーザダイオードであることが好ましい。   The light emitting element is preferably a laser diode.

本発明によれば、発光素子からの光に起因する熱による透光性部材の劣化を大幅に軽減することが可能となり、高出力かつ長寿命の発光装置を得ることができる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce significantly the deterioration of the translucent member by the heat | fever resulting from the light from a light emitting element, and can obtain the light-emitting device of high output and long life.

以下、本発明の発光装置を図面に基づいて説明する。ただし、以下に示す発光装置は、本発明の技術思想を具体化するためのものであって、本発明を以下のものに特定しない。特定的な記載がない限りは、構成部材の寸法、材質、形状、その相対的配置などは、本発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。なお、各図面が示す部材の大きさや位置関係などは、説明を明確にするため誇張していることがある。さらに、本発明を構成する各要素は、複数の要素を同一の部材で構成して一の部材で複数の要素を兼用する態様としてもよいし、逆に一の部材の機能を複数の部材で分担して実現することもできる。   Hereinafter, a light-emitting device of the present invention will be described with reference to the drawings. However, the light-emitting device described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following. As long as there is no specific description, the dimension, material, shape, relative arrangement, and the like of the constituent members are not intended to limit the scope of the present invention only, but are merely illustrative examples. Note that the size and positional relationship of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.

本発明の発光装置は、図１に示すように、発光素子１０と、導光部材２０と、被覆部材３０と、透光性部材４０とから主として構成される。本発明の発光装置では、導光部材２０の出射端部側における側面を被覆するとともに導光部材２０の出射端部の少なくとも一部を底部とした凹部の側壁となる被覆部材３０を有し、かつ透光性部材４０がその凹部に延在するよう配置されている。これにより、導光部材２０から出射した光による熱を、透光性部材４０だけでなく被覆部材３０にも逃がすことができるので、透光性部材４０の熱による劣化、変色は大幅に軽減される。   As shown in FIG. 1, the light emitting device of the present invention is mainly composed of a light emitting element 10, a light guide member 20, a covering member 30, and a translucent member 40. In the light emitting device of the present invention, the light emitting device has a covering member 30 that covers the side surface on the emission end side of the light guide member 20 and serves as a side wall of a recess having at least a part of the emission end portion of the light guide member 20 as a bottom. And the translucent member 40 is arrange | positioned so that it may extend in the recessed part. As a result, heat generated by the light emitted from the light guide member 20 can be released not only to the translucent member 40 but also to the covering member 30, so that deterioration and discoloration of the translucent member 40 due to heat are greatly reduced. The

以下、本発明の発光装置を構成する主な要素について説明する。なお、本発明においては、図１に示すユニットを少なくとも２つ以上組み合わせて発光装置とすることもできる。   Hereinafter, main elements constituting the light emitting device of the present invention will be described. In the present invention, at least two units shown in FIG. 1 can be combined to form a light emitting device.

（発光素子）
発光素子１０は特に限定されるものではないが、好ましくはＬＤやＬＥＤを用いることができる。これらを使用することにより、初期駆動特性に優れ、振動やオン・オフ点灯の繰り返しに強く、発光出力の高い発光装置とすることができる。 (Light emitting element)
The light emitting element 10 is not particularly limited, but an LD or LED can be preferably used. By using these, it is possible to obtain a light emitting device that has excellent initial drive characteristics, is resistant to repeated vibration and on / off lighting, and has a high light emission output.

特にＬＤを用いる場合、ＬＤ自体の発光出力が非常に高いので、発光装置としての発光出力も容易に向上するものの、出力向上により透光性部材４０が劣化し、変色してしまう。さらに、透光性部材４０に波長変換部材を含有させる場合、透光性部材４０だけでなく波長変換部材に対しても変色などの悪影響を与える可能性がある。本願発明は、透光性部材４０や波長変換部材への悪影響を大幅に軽減することができるので、ＬＤを用いる場合に特に効果的である。   In particular, when the LD is used, the light emission output of the LD itself is very high, so that the light emission output as the light emitting device is easily improved. However, the translucent member 40 is deteriorated and discolored due to the output improvement. Furthermore, when the light transmissive member 40 contains a wavelength conversion member, not only the light transmissive member 40 but also the wavelength conversion member may be adversely affected such as discoloration. The present invention is particularly effective when an LD is used because the adverse effect on the translucent member 40 and the wavelength conversion member can be greatly reduced.

図１に示すように、発光素子１０と導光部材２０との間に、レンズ２を設けることもできる。これにより、発光素子１０からの光１を集光させ、効率よく導光部材２０に導出することができる。レンズ２の材料は特に限定されず、例えば無機ガラスとすることができる。ここでは一枚のレンズを用いる例を示すが、複数枚用いることも可能である。   As shown in FIG. 1, the lens 2 may be provided between the light emitting element 10 and the light guide member 20. Thereby, the light 1 from the light emitting element 10 can be condensed and efficiently led out to the light guide member 20. The material of the lens 2 is not specifically limited, For example, it can be set as inorganic glass. Here, an example in which one lens is used is shown, but a plurality of lenses can also be used.

（導光部材）
導光部材２０は、光を入射する入射端部と出射する出射端部を備え、所望の長さを有するとともにその形状を自由に変形させることができる。つまり、直角に曲げたり湾曲させたりすることができ、屈曲可能に構成されているため、所望の位置に光を導出することができる。 (Light guide member)
The light guide member 20 includes an incident end portion that receives light and an exit end portion that emits light, and has a desired length and can be freely deformed. That is, it can be bent or curved at right angles and bendable, so that light can be led to a desired position.

導光部材２０の材質は特に限定されるものではないが、ガラスやプラスチックから構成された光ファイバを用いることが好ましい。光ファイバは、通常、屈折率の低いクラッドが屈折率の高いコアを被覆するようにして構成される。また、導光部材２０の入射端部及び出射端部の形状は特に限定されず、平面、凸レンズ状、凹レンズ状、部分的に凹凸を設けた形状など、種々の形状とすることができる。   The material of the light guide member 20 is not particularly limited, but it is preferable to use an optical fiber made of glass or plastic. The optical fiber is usually configured such that a clad having a low refractive index covers a core having a high refractive index. Moreover, the shape of the incident end part and the output end part of the light guide member 20 is not particularly limited, and may be various shapes such as a flat surface, a convex lens shape, a concave lens shape, and a partially uneven shape.

なお、本明細書において、導光部材２０の出射端部とは、必ずしも端部における光が出射する部分を限定的に指すのではなく、あくまで光が出射する側の端部を指す。具体的には、例えば、クラッドがコアを内部に被覆するように構成された光ファイバを導光部材２０として用いる場合、光が出射される部分は主にコアであるが、本明細書においてはコア及びクラッドを含めた光を出射する側の端部を出射端部とする。入射端部も同様である。   In the present specification, the emission end portion of the light guide member 20 does not necessarily indicate a portion where light is emitted from the end portion, but rather indicates an end portion on the side from which light is emitted. Specifically, for example, when an optical fiber configured so that a clad coats the core inside is used as the light guide member 20, a portion from which light is emitted is mainly the core. An end on the side of emitting light including the core and the clad is defined as an emission end. The same applies to the incident end.

（透光性部材）
透光性部材４０は、発光素子１０からの光を透過するものであり、例えば、エポキシ樹脂、シリコーン樹脂などの有機部材、低融点ガラス、結晶化ガラスなどの無機部材が挙げられる。中でも、シリコーン樹脂は、ある程度の光や熱に対する耐久性と形成の容易性を有するので好ましい。透光性部材４０の形状は特に限定されず、凸レンズ状など種々の形状とすることができる。 (Translucent member)
The translucent member 40 transmits light from the light emitting element 10, and examples thereof include organic members such as epoxy resin and silicone resin, and inorganic members such as low melting point glass and crystallized glass. Among these, silicone resins are preferable because they have a certain degree of durability against light and heat and easy formation. The shape of the translucent member 40 is not particularly limited, and can be various shapes such as a convex lens shape.

透光性部材４０には、波長変換部材を含有させることもできる。波長変換部材は、例えば蛍光体からなり、発光素子１０からの光の少なくとも一部を吸収し、異なる波長領域に波長を変換して、赤色、緑色、青色などに発光スペクトルを有する光を放出し得るものである。波長変換部材を有する場合、発光素子１０からの光と１以上の波長変換部材からの光が合成されたり、２以上の波長変換部材からの光が合成されたりして、白色系の色とすることもできる。なお、良好な演色性を得るためには、照射光の平均演色評価数（Ｒａ）が７０以上、さらに８０以上となるような材料によって構成されることが好ましい。   The light transmissive member 40 may contain a wavelength conversion member. The wavelength conversion member is made of, for example, a phosphor, absorbs at least a part of the light from the light emitting element 10, converts the wavelength to a different wavelength region, and emits light having an emission spectrum in red, green, blue, or the like. To get. When it has a wavelength conversion member, the light from the light emitting element 10 and the light from one or more wavelength conversion members are combined, or the light from two or more wavelength conversion members is combined into a white color. You can also In order to obtain good color rendering properties, it is preferable that the average color rendering index (Ra) of the irradiated light is 70 or more, and more preferably 80 or more.

ここで、透光性部材４０は発光素子１０からの光を透過させるものであるが、一部の光は透過されずに吸収され熱に変換される。また、透光性部材４０が波長変換部材を有する場合、波長変換部材が吸収した一部の光は波長変換されずに熱となる。一方、導光部材２０は、光を導出するとともに屈曲可能な程度に細いので、出射端部側に配置された透光性部材４０や波長変換部材への光の集中、それにともなう発熱は著しい。したがって、本発明は、好ましくは３０００μｍ以下、より好ましくは１０００μｍ以下、さらに好ましくは４００μｍ以下、さらに好ましくは２００μｍ以下の直径を有する屈曲可能な程度に細い導光部材２０を用いる構成において非常に効果的である。   Here, although the translucent member 40 transmits the light from the light emitting element 10, a part of the light is not transmitted but is absorbed and converted into heat. Moreover, when the translucent member 40 has a wavelength conversion member, a part of light absorbed by the wavelength conversion member becomes heat without being wavelength-converted. On the other hand, since the light guide member 20 is thin enough to bend light and bendable, the light is concentrated on the translucent member 40 and the wavelength conversion member arranged on the emission end side, and the heat generation associated therewith is remarkable. Accordingly, the present invention is very effective in a configuration using a light guide member 20 that is thin enough to be bent and has a diameter of preferably 3000 μm or less, more preferably 1000 μm or less, further preferably 400 μm or less, and further preferably 200 μm or less. It is.

また、光による波長変換部材の熱量は、通常は、透光性部材４０の熱量より遥かに大きいので、本発明は透光性部材４０が波長変換部材を有する場合に特に効果的である。   Moreover, since the heat quantity of the wavelength conversion member by light is usually much larger than the heat quantity of the translucent member 40, this invention is especially effective when the translucent member 40 has a wavelength conversion member.

本発明における透光性部材４０には、任意に、ＳｉＯ２などのフィラーを含有させることもできる。フィラーは、外部から照射された光を反射、散乱させるためのものである。これにより、混色が良好になるとともに色むらを低減させることができる。また、透光性部材４０にフィラーを混合することにより、その粘度を調整することができるので、導光部材２０や被覆部材３０に容易に配置させることができる。 The translucent member 40 in the present invention can optionally contain a filler such as SiO 2 . The filler is for reflecting and scattering light emitted from the outside. Thereby, color mixing becomes favorable and color unevenness can be reduced. Moreover, since the viscosity can be adjusted by mixing a filler with the translucent member 40, it can be easily arranged on the light guide member 20 or the covering member 30.

（被覆部材）
被覆部材３０は、導光部材２０における出射端部側の側面つまり周囲を被覆するものである。より詳細には、被覆部材３０は、導光部材２０の出射端部の少なくとも一部を底部とした凹部の側壁となるよう構成されている。本発明における凹部の側壁は、好ましくは０．３μｍ以上、より好ましくは０．６μｍ以上、さらに好ましくは１、２μｍ以上とすることができる。これにより、本発明の効果をより容易に得ることができる。導光部材２０と被覆部材３０で形成される凹部の底部は、平面だけでなく曲面や点状など、種々の形状とすることができる。凹部の側壁高さ及び凹部の深さは、例えば、レーザ顕微鏡、プローブ顕微鏡、段差計などを用いて測定することができる。 (Coating member)
The covering member 30 covers the side surface of the light emitting member 20 on the light emitting end side, that is, the periphery. More specifically, the covering member 30 is configured to be a side wall of a concave portion having at least a part of the emission end portion of the light guide member 20 as a bottom portion. The side wall of the recess in the present invention is preferably 0.3 μm or more, more preferably 0.6 μm or more, and further preferably 1, 2 μm or more. Thereby, the effect of the present invention can be obtained more easily. The bottom of the recess formed by the light guide member 20 and the covering member 30 can have various shapes such as a curved surface and a dotted shape as well as a flat surface. The height of the side wall of the recess and the depth of the recess can be measured using, for example, a laser microscope, a probe microscope, a step meter, or the like.

凹部の底部は、導光部材２０の出射端部のみから構成される必要はなく、少なくとも導光部材３０の出射端部を含んでいればよい。例えば、導光部材２０の出射端部と被覆部材３０の一部が略面一になるよう、凹部の底部を構成することもできる。このような構成においても、本発明の効果を得ることができる。しかしながら、本発明の効果をより効果的かつ再現性よく得るには、凹部の底部は、実質的に導光部材２０の出射端部のみから構成されることが好ましい。また、凹部の側壁は、底部に対して略垂直であることが好ましいが、傾斜していてもよい。   The bottom of the concave portion does not need to be configured only from the emission end portion of the light guide member 20, and only needs to include at least the emission end portion of the light guide member 30. For example, the bottom of the concave portion can be configured so that the emission end portion of the light guide member 20 and a part of the covering member 30 are substantially flush with each other. Even in such a configuration, the effects of the present invention can be obtained. However, in order to obtain the effects of the present invention more effectively and with good reproducibility, it is preferable that the bottom portion of the recess is substantially composed only of the emission end portion of the light guide member 20. The side wall of the recess is preferably substantially perpendicular to the bottom, but may be inclined.

被覆部材３０と導光部材２０で構成される凹部に延在する透光性部材４０は、凹部に延在するだけでなく被覆部材３０の端部の少なくとも一部に配置されていることが好ましい。例えば、図２のように、被覆部材３０の端部の全部に透光性部材４０を配置することにより、被覆部材３０の凹部側壁の部分からだけでなく、被覆部材３０の端部からも、透光性部材４０に生じる熱を逃がすことができる。なお、被覆部材３０と導光部材２０で凹部を形成しない場合、例えば、被覆部材３０と導光部材２０が端部において面一である場合であっても、導光部材２０の端部だけでなく被覆部材３０の端部の少なくとも一部に透光性部材４０を配置することにより、透光性部材４０に生じる熱を被覆部材３０の端部から逃がすことができる。つまり、被覆部材３０と導光部材２０で凹部を形成しない場合であっても、透光性部材４０の劣化を軽減することができる。しかしながら、図２のように、透光性部材４０を凹部に延在させ且つ被覆部材３０の端部の少なくとも一部に配置させることにより、より効果的に透光性部材４０の劣化を軽減させることができるので好ましい。   It is preferable that the translucent member 40 extending in the concave portion constituted by the covering member 30 and the light guide member 20 is disposed not only in the concave portion but also in at least a part of the end portion of the covering member 30. . For example, as shown in FIG. 2, by arranging the translucent member 40 on the entire end portion of the covering member 30, not only from the concave side wall portion of the covering member 30, but also from the end portion of the covering member 30, Heat generated in the translucent member 40 can be released. In addition, when a recessed part is not formed by the covering member 30 and the light guide member 20, for example, even when the covering member 30 and the light guide member 20 are flush with each other at the ends, only the end of the light guide member 20 is used. By arranging the translucent member 40 at least at a part of the end portion of the covering member 30, heat generated in the translucent member 40 can be released from the end portion of the covering member 30. That is, even when the concave portion is not formed by the covering member 30 and the light guide member 20, the deterioration of the translucent member 40 can be reduced. However, as shown in FIG. 2, the translucent member 40 extends in the recess and is disposed on at least a part of the end of the covering member 30, thereby more effectively reducing the deterioration of the translucent member 40. This is preferable.

なお、凹部の側壁となる被覆部材３０と透光性部材４０は熱的に接続されていればよく、必ずしも被覆部材３０と透光性部材４０が直接かつ完全に接していなくてもよい。例えば、凹部側壁において、被覆部材３０と透光性部材４０が部分的に接するような構成や、被覆部材３０と透光性部材４０との間に何かしらの熱伝導性部材を介して間接的に接するように構成することもできる。被覆部材３０の端部と透光性部材４０についても同様である。   Note that the covering member 30 and the translucent member 40 serving as the side wall of the recess need only be thermally connected, and the covering member 30 and the translucent member 40 do not necessarily have to be in direct and complete contact. For example, a configuration in which the covering member 30 and the translucent member 40 are partially in contact with each other on the side wall of the recess, or indirectly through some heat conductive member between the covering member 30 and the translucent member 40. It can also be configured to touch. The same applies to the end of the covering member 30 and the translucent member 40.

被覆部材３０は、熱伝導率を有するものであればどのような材料でもよいが、特に透光性部材４０の熱伝導率よりも被覆部材３０の熱伝導率が高くなるよう構成することが好ましい。これにより、より積極的に被覆部材３０に放熱させ、透光性部材４０の熱による悪影響を軽減することができる。   The covering member 30 may be made of any material as long as it has thermal conductivity, but it is particularly preferable that the covering member 30 has a higher thermal conductivity than that of the translucent member 40. . Thereby, it is possible to more positively dissipate heat to the covering member 30, and to reduce an adverse effect due to heat of the translucent member 40.

被覆部材３０は、０．１Ｗ／ｍ・℃以上の熱伝導率を有するものが好ましい。また、発光素子１０からの光及び／又は波長変換部材により波長変換された光のピーク波長に対して８０％以上の反射率を有するものが好ましい。具体的には銀（Ａｇ）、アルミニウム（Ａｌ）、銅（Ｃｕ）、ジルコニア（ＺｒＯ2）、アルミナ（Ａｌ２Ｏ３）、窒化アルミ（ＡｌＮ）、硫酸バリウム（ＢａＳＯ４）、カーボン、ステンレス鋼、ホウケイ酸ガラスなどが挙げられる。なかでも、ジルコニアは、反射率が高く、導光部材が通るように加工することが容易であるので好ましい。さらに、アルミナは、可視光全域に対する反射率が高く且つ熱伝導率が高いので、白色系の発光色を発する発光装置とする場合に特に好ましい。 The covering member 30 preferably has a thermal conductivity of 0.1 W / m · ° C. or higher. Moreover, what has a reflectance of 80% or more with respect to the peak wavelength of the light from the light emitting element 10 and / or the light wavelength-converted by the wavelength conversion member is preferable. Specifically, silver (Ag), aluminum (Al), copper (Cu), zirconia (ZrO 2 ), alumina (Al 2 O 3 ), aluminum nitride (AlN), barium sulfate (BaSO 4 ), carbon, stainless steel And borosilicate glass. Among these, zirconia is preferable because it has high reflectivity and can be easily processed so that the light guide member passes. In addition, alumina is particularly preferable for a light-emitting device that emits a white light-emitting color because of its high reflectance and high thermal conductivity for the entire visible light region.

また、被覆部材３０は、単一の部材である必要はなく、複数の部材から構成することもできる。例えば、導光部材２０の出射端部側おける側面を被覆する第１の部材と、導光部材２０の出射端部の少なくとも一部を底部とした凹部の側壁となる第２の部材と、から被覆部材２０を構成させてもよい。第２の部材は、第１の部材よりも熱伝導率の高い部材であることが好ましい。これにより、透光性部材４０から被覆部材３０への放熱性をより向上させることができる。   Moreover, the covering member 30 does not need to be a single member, and can be composed of a plurality of members. For example, a first member that covers the side surface of the light guide member 20 on the emission end portion side, and a second member that serves as a side wall of a recess having at least a part of the emission end portion of the light guide member 20 as a bottom. The covering member 20 may be configured. The second member is preferably a member having a higher thermal conductivity than the first member. Thereby, the heat dissipation from the translucent member 40 to the coating | coated member 30 can be improved more.

被覆部材３０は、透光性部材４０を配置する面に、ミラーをつけて鏡面反射をさせるか、所定の凹凸を形成して光を乱反射させるなどの加工をしてもよい。これにより、発光素子の光及び／又は波長変換された光が反射によって導光部材２０側に戻ってきた場合に、被覆部材３０によって再度反射させることにより、発光素子からの光及び／又は波長変換された光を有効に外部に取り出すことができる。また、凹凸が形成されている場合には、透光性部材４０の被覆部材３０への密着性が向上し、透光性部材４０の放熱を増大させるとともに、透光性部材４０の剥がれや劣化を防止することができる。なお、鏡面反射及び／又は凹凸を有する面は、被覆部材３０のみならず、導光部材２０の出射端部の少なくとも一部に設けてもよい。   The covering member 30 may be subjected to processing such as attaching a mirror to the surface on which the translucent member 40 is disposed and performing specular reflection, or forming predetermined irregularities to irregularly reflect light. Thereby, when the light of the light emitting element and / or the wavelength-converted light returns to the light guide member 20 side by reflection, the light from the light emitting element and / or wavelength conversion is reflected again by the covering member 30. The emitted light can be effectively extracted outside. Moreover, when the unevenness | corrugation is formed, while the adhesiveness to the coating | coated member 30 of the translucent member 40 improves, while the heat dissipation of the translucent member 40 is increased, peeling and deterioration of the translucent member 40 are carried out. Can be prevented. In addition, the surface having specular reflection and / or unevenness may be provided not only on the covering member 30 but also on at least a part of the emission end portion of the light guide member 20.

以下に、本発明の一実施の形態について説明する。   An embodiment of the present invention will be described below.

（実施の形態）
本実施の形態の発光装置は、図１に示すように、発光素子１０と、導光部材２０と、被覆部材３０と、透光性部材４０から主に構成されている。発光素子１０の前面には、発光素子１０からの光１を集光するためのレンズ２を設けてある。 (Embodiment)
As shown in FIG. 1, the light-emitting device according to the present embodiment mainly includes a light-emitting element 10, a light guide member 20, a covering member 30, and a translucent member 40. A lens 2 for condensing the light 1 from the light emitting element 10 is provided on the front surface of the light emitting element 10.

発光素子１０として４４５ｎｍ近傍に発光ピーク波長を有するＧａＮ系の半導体からなるＬＤ、導光部材２０として石英製のＳＩ型１１４（μｍ：コア径）／１２５（μｍ：クラッド径）光ファイバ、被覆部材３０としてジルコニア（ＺｒＯ２）からなる直系０．７ｍｍのもの、透光性部材４０としてシリコーン樹脂を用いた。さらに、透光性部材４０には、シリコーン樹脂１．１ｇに対して、波長変換部材として、緑色に発光するＬｕ３Ａｌ５Ｏ１２：Ｃｅ、０．５４ｇと、赤色に発光する（Ｓｒ、Ｃａ）２Ｓｉ５Ｎ８：Ｅｕ、０．１ｇの２種の蛍光体が含有されている。なお、本実施の形態において、ジルコニアはシリコーン樹脂に比べて３倍程度高い熱伝導率を有する。 The light emitting element 10 is an LD made of a GaN-based semiconductor having an emission peak wavelength near 445 nm, the light guide member 20 is an SI type 114 (μm: core diameter) / 125 (μm: clad diameter) optical fiber, and a covering member made of quartz. A straight line 0.7 mm made of zirconia (ZrO 2 ) was used as 30, and a silicone resin was used as the translucent member 40. Furthermore, the translucent member 40 emits red light as Lu 3 Al 5 O 12 : Ce, 0.54 g, which emits green light as a wavelength conversion member, relative to 1.1 g of silicone resin (Sr, Ca ) 2 Si 5 N 8 : Eu, 0.1 g of two phosphors are contained. In this embodiment, zirconia has a thermal conductivity that is about three times higher than that of silicone resin.

図２に示すよう、本実施の形態では、導光部材２０の出射端部全域を一平面の底部とし、被覆部材３０を側壁とした凹部が設けられている。凹部を形成するには、例えば、導光部材２０と被覆部材３０が異なる材料からなることを利用し、研磨剤などを用いて選択的に導光部材２０を研磨することにより形成することができる。ここでは、被覆部材３０の端部から略１．６μｍ凹んだ凹部を形成した。   As shown in FIG. 2, in the present embodiment, a concave portion is provided in which the entire emission end portion of the light guide member 20 is a flat bottom portion and the covering member 30 is a side wall. In order to form the recess, for example, the light guide member 20 and the covering member 30 are made of different materials, and can be formed by selectively polishing the light guide member 20 using an abrasive or the like. . Here, a recess recessed by approximately 1.6 μm from the end of the covering member 30 was formed.

このようにして凹部を設けた後、導光部材２０及び被覆部材３０の出射端部側に透光性部材４０をポッティングにより配置した。ここでは、より完全に透光性部材４０を凹部内に延在させるために、ポッティング後に減圧処理を施した。   Thus, after providing a recessed part, the translucent member 40 was arrange | positioned by the potting | emitting end part side of the light guide member 20 and the coating | coated member 30 by potting. Here, in order to extend the translucent member 40 more completely into the recess, a decompression process was performed after potting.

比較例として、出射端部側において導光部材２０と被覆部材３０が一平面つまり面一である以外同様の構成の発光装置を作製した。   As a comparative example, a light emitting device having the same configuration was manufactured except that the light guide member 20 and the covering member 30 were on one plane, that is, flush with the emission end.

図３に、本実施の形態の発光装置と比較例の発光装置において、ＬＤを８０〜４３０ｍＡで駆動させて、その特性を評価した。図３に示したように、本実施の形態の発光装置は、比較例の発光装置に比較して光束の最高値が２０％程度向上し、発光出力が向上することが確認された。図３によれば、比較例の発光装置は、駆動電流が約３７０ｍＡを境に、急激に光束が低下した。この主な理由は、透光性部材４０が熱により劣化し変色してしまったためである。それに対して本実施の形態においては、駆動電流が約４２０ｍＡまで飽和することなく光束が向上することが確認された。以上の結果から、本発明の発光装置では、比較例に比較して、透光性部材４０がより劣化しにくいことがわかった。   In FIG. 3, in the light emitting device of this embodiment and the light emitting device of the comparative example, the LD was driven at 80 to 430 mA, and the characteristics were evaluated. As shown in FIG. 3, it was confirmed that the light emitting device of the present embodiment improved the maximum luminous flux by about 20% compared with the light emitting device of the comparative example and improved the light emission output. According to FIG. 3, in the light emitting device of the comparative example, the luminous flux suddenly decreased at the drive current of about 370 mA. The main reason is that the translucent member 40 is deteriorated and discolored by heat. On the other hand, in the present embodiment, it was confirmed that the luminous flux was improved without saturation of the drive current up to about 420 mA. From the above results, it was found that in the light emitting device of the present invention, the translucent member 40 is more difficult to deteriorate as compared with the comparative example.

以上の実施の形態では、導光部材２０の出射端部を一平面としたが、例えば断面がＶ字型になるよう円錐状に凹ませた出射端部としても、発光出力が向上することを確認した。また、透光性部材４０に波長変換部材を含有させて構成しているが、波長変換部材を含有させずに用いても本発明の効果を得ることができる。さらに、リフレクターを設けて、透光性部材４０からの光を強制的に所望の方向へ反射させることもできる。   In the above embodiment, the light emitting member 20 has a light emitting end portion that is flat. However, for example, the light emitting output is improved even when the light emitting member is conically recessed so that the cross section is V-shaped. confirmed. Moreover, although the wavelength conversion member is included in the translucent member 40, the effect of the present invention can be obtained even if the wavelength conversion member is not included. Further, a reflector can be provided to forcibly reflect the light from the translucent member 40 in a desired direction.

本発明の発光装置は、照明器具、車両搭載用照明、ディスプレイ、インジケータなどに利用することができる。また、生体内部を撮像する内視鏡装置、狭い隙間及び暗い空間を照明することができるファイバースコープなど、各種工業用の装置にも利用することができる。   The light-emitting device of the present invention can be used for lighting fixtures, vehicle-mounted lighting, displays, indicators, and the like. Further, the present invention can also be used for various industrial apparatuses such as an endoscope apparatus that images the inside of a living body, and a fiberscope that can illuminate a narrow gap and a dark space.

本発明の発光装置の構造を説明するための構成図である。It is a block diagram for demonstrating the structure of the light-emitting device of this invention. 実施の形態における導光部材の出射端部近傍の構造を示す断面図である。It is sectional drawing which shows the structure of the radiation | emission end part vicinity of the light guide member in embodiment. 実施の形態における発光装置の光束−駆動電流の関係を示すグラフである。It is a graph which shows the relationship of the light beam-drive current of the light-emitting device in embodiment.

符号の説明Explanation of symbols

１・・・光
２・・・レンズ
１０・・・発光素子
２０・・・導光部材
３０・・・被覆部材
４０・・・透光性部材

DESCRIPTION OF SYMBOLS 1 ... Light 2 ... Lens 10 ... Light emitting element 20 ... Light guide member 30 ... Cover member 40 ... Translucent member

Claims (4)

発光素子と、発光素子からの光を入射する入射端部及び出射する出射端部を備え屈曲可能に延長した導光部材と、発光素子からの光を異なる波長域に変換する波長変換部材を有する透光性部材と、を有する発光装置において、
前記発光装置は、導光部材の出射端部側における側面を被覆するとともに導光部材の出射端部の少なくとも一部を底部とした凹部の側壁となる被覆部材を有し、
凹部の底部は、実質的に導光部材の出射端部のみからなり、
前記透光性部材は、前記被覆部材の端部の少なくとも一部に配置され、前記凹部に延在しており、
前記被覆部材は、前記透光性部材よりも熱伝導率が高いことを特徴とする発光装置。 A light-emitting element; a light guide member that includes an incident end portion that emits light from the light-emitting element and an exit end portion that emits light; and a bendable extension member; and a wavelength conversion member that converts light from the light-emitting element into different wavelength ranges. A light-emitting device having a translucent member,
The light-emitting device includes a covering member that covers the side surface on the emission end portion side of the light guide member and serves as a side wall of a recess having at least a part of the emission end portion of the light guide member as a bottom,
The bottom of the recess is substantially composed only of the light exit end of the light guide member,
The translucent member is disposed on at least a part of the end portion of the covering member, and extends in the recess.
The light-emitting device , wherein the covering member has higher thermal conductivity than the translucent member . 前記透光性部材は、ポッティングにより配置したシリコーン樹脂であり、前記被覆部材の端部の全部に配置されていることを特徴とする請求項１に記載の発光装置。 The light-emitting device according to claim 1, wherein the translucent member is a silicone resin disposed by potting, and is disposed on all of the end portions of the covering member. 前記導光部材は、出射端面が円錐状に凹んでいることを特徴とする請求項１又は２に記載の発光装置。   The light emitting device according to claim 1, wherein the light guide member has a conical concave exit surface. 請求項１〜３のいずれかに記載の発光装置において、
前記発光素子は、レーザダイオードであり、
前記凹部の側壁は、底部に対して略垂直であることを特徴とする発光装置。 In the light-emitting device in any one of Claims 1-3,
The light emitting device, Ri Oh laser diode,
Side wall of the recess, the light emitting device according to claim substantially perpendicular der Rukoto to the bottom.
JP2005126193A 2004-12-17 2005-04-25 Light emitting device Active JP5124908B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2005126193A JP5124908B2 (en) 2005-03-10 2005-04-25 Light emitting device
CN2005101289819A CN1789795B (en) 2004-12-17 2005-12-02 Light emitting device
CN2009101644611A CN101630813B (en) 2004-12-17 2005-12-02 Light emitting device
EP05257760.8A EP1672755B1 (en) 2004-12-17 2005-12-16 Light emitting device
US11/306,106 US7356054B2 (en) 2004-12-17 2005-12-16 Light emitting device
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