JP7031926B1 - Light irradiation unit - Google Patents

Light irradiation unit Download PDF

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JP7031926B1
JP7031926B1 JP2021569484A JP2021569484A JP7031926B1 JP 7031926 B1 JP7031926 B1 JP 7031926B1 JP 2021569484 A JP2021569484 A JP 2021569484A JP 2021569484 A JP2021569484 A JP 2021569484A JP 7031926 B1 JP7031926 B1 JP 7031926B1
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優 板崎
悦司 大村
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Kyoto Semiconductor Co Ltd
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Abstract

【課題】簡単な構造で複数の発光素子の光を同一領域に重なるように照射することができる光照射ユニットを提供すること。【解決手段】光照射ユニット(1)は、楕円の第１、第２焦点(F1,F2)を通る長軸を回転軸としてこの楕円を回転させた回転楕円面の部分凹面を反射面(11)とする凹面反射鏡(10)と、凹面反射鏡(10)の反射面(11)に向けて発光させる複数の発光素子(20)と、凹面反射鏡(10)と複数の発光素子(20)を固定するための基台(30)を有し、凹面反射鏡(10)の回転軸方向両端側部分が夫々開放状に形成され、凹面反射鏡(10)の周壁部(12)の第１焦点側端部が基台(30)に固定され、第１焦点(F1)の近傍において、複数の発光素子(20)を基台(30)の中央部分に基台(30)に対して同じ傾斜角で互いに異なる方向に向けて形成された複数の傾斜面(37,38)に夫々固定することにより、複数の発光素子(20)を発光させたときの光を、凹面反射鏡(10)により反射させて回転軸方向の第２焦点(F2)よりも遠い位置で重ね合わせる。【選択図】図４PROBLEM TO BE SOLVED: To provide a light irradiation unit capable of irradiating light of a plurality of light emitting elements so as to overlap the same region with a simple structure. SOLUTION: A light irradiation unit (1) has a reflecting surface (11) on a partially concave surface of a rotating elliptical surface obtained by rotating the elliptical axis with a long axis passing through the first and second focal points (F1, F2) of the elliptical axis as a rotation axis. ), A plurality of light emitting elements (20) that emit light toward the reflecting surface (11) of the concave reflecting mirror (10), a concave reflecting mirror (10), and a plurality of light emitting elements (20). ) Is provided, and both end portions of the concave reflector (10) in the rotation axis direction are formed in an open shape, and the peripheral wall portion (12) of the concave reflector (10) is formed in an open shape. One focal point side end is fixed to the base (30), and in the vicinity of the first focus (F1), a plurality of light emitting elements (20) are placed in the central portion of the base (30) with respect to the base (30). The concave reflector (10) emits light when a plurality of light emitting elements (20) are emitted by fixing them to a plurality of inclined surfaces (37, 38) formed at the same inclination angle in different directions. ) To reflect and superimpose at a position farther than the second focal point (F2) in the direction of the axis of rotation. [Selection diagram] FIG. 4

Description

本発明は、分光分析の検体に光を照射するための光照射ユニットに関し、特に複数の光源の光を重ねて照射可能な光照射ユニットに関する。 The present invention relates to a light irradiation unit for irradiating a sample for spectroscopic analysis with light, and more particularly to a light irradiation unit capable of irradiating light from a plurality of light sources in an overlapping manner.

従来から、検体に光を照射して、その透過光、散乱光のスペクトルを測定する分光分析が行われている。分光分析では、異なる波長域の光を照射するための光源と、これらの波長域に感度を有する受光素子を備えた分光分析装置が利用されている。 Conventionally, spectroscopic analysis has been performed in which a sample is irradiated with light and the spectra of transmitted light and scattered light are measured. In spectroscopic analysis, a spectroscopic analyzer equipped with a light source for irradiating light in different wavelength ranges and a light receiving element having sensitivity in these wavelength ranges is used.

分光分析装置では、気体又は液体の状態の検体に光が照射され、検体特有の吸収スペクトルを測定して検体の同定、特性の測定等を行う。この測定の精度向上のためには、広い波長域の光を照射可能な光源が必要とされる。このような光源として白熱光又は放電を利用するものが知られているが、小型化することが容易ではなく、発熱、寿命に関する課題がある。 In the spectroscopic analyzer, a sample in a gas or liquid state is irradiated with light, and the absorption spectrum peculiar to the sample is measured to identify the sample, measure the characteristics, and the like. In order to improve the accuracy of this measurement, a light source capable of irradiating light in a wide wavelength range is required. As such a light source, one using incandescent light or electric discharge is known, but it is not easy to miniaturize it, and there are problems in heat generation and life.

一方、発する光の波長域は広くないが、小型化が可能で低発熱、長寿命の発光ダイオード（ＬＥＤ）を光源とする光照射ユニットが知られている。例えば特許文献１には、回転放物面の凹面を反射面とする凹面反射鏡と、この凹面反射鏡の回転軸と同軸の支柱の側面に配設された同一の波長域の光を発する複数のＬＥＤと、これらのＬＥＤと凹面反射鏡の間に光学レンズを備えた光照射ユニットが記載されている。この光照射ユニットは、光学レンズによって、凹面反射鏡の焦点に配設されたＬＥＤから光を出射したものとみなすことができ、この光を凹面反射鏡で反射させて平行光として出射する。 On the other hand, although the wavelength range of the emitted light is not wide, a light irradiation unit using a light emitting diode (LED) as a light source, which can be miniaturized, has low heat generation, and has a long life, is known. For example, Patent Document 1 describes a concave reflecting mirror having a concave surface of a rotating parabolic surface as a reflecting surface, and a plurality of light emitting light having the same wavelength range arranged on the side surface of a column coaxial with the rotation axis of the concave reflecting mirror. And a light irradiation unit provided with an optical lens between these LEDs and a concave reflector are described. This light irradiation unit can be regarded as emitting light from an LED arranged at the focal point of the concave reflecting mirror by an optical lens, and this light is reflected by the concave reflecting mirror and emitted as parallel light.

また、例えば特許文献２には、回転楕円面の部分凹面を反射面とする複数の反射鏡であって、回転楕円面の２つの焦点のうちの一方を互いに共有するように配設された複数の反射鏡と、他方の焦点に夫々配設された複数のＬＥＤと、共有する焦点の近傍に形成された凹面鏡を備えた光照射ユニットが記載されている。この光照射ユニットは、複数のＬＥＤから出射した光を対応する反射鏡が共有する焦点に向けて夫々反射し、これらの光を凹面鏡が反射することによって平行光を出射する。 Further, for example, in Patent Document 2, a plurality of reflecting mirrors having a partially concave surface of the rotating elliptical surface as a reflecting surface, which are arranged so as to share one of the two focal points of the rotating elliptical surface with each other. A light irradiation unit including a reflector of the above, a plurality of LEDs arranged at the other focal points, and a concave mirror formed in the vicinity of the shared focal point is described. The light irradiation unit reflects the light emitted from the plurality of LEDs toward the focal point shared by the corresponding reflecting mirrors, and the concave mirror reflects these lights to emit parallel light.

特開２０１８－１３７１２８JP-A-2018-137128 特表２０１０－５０３９５４Special table 2010-503954

特許文献１、２の光照射ユニットは、複数のＬＥＤの光が夫々平行光として出射されるので、複数のＬＥＤが発した光の大部分を検体に照射可能である。しかし、平行光なので、複数のＬＥＤの光を同一領域に重なるように照射することが困難である。 In the light irradiation unit of Patent Documents 1 and 2, since the light of the plurality of LEDs is emitted as parallel light, most of the light emitted by the plurality of LEDs can irradiate the sample. However, since it is parallel light, it is difficult to irradiate the light of a plurality of LEDs so as to overlap the same region.

また、特許文献１では、アレイ状に並べられた発光波長域が異なる複数の発光素子によって各ＬＥＤが構成されているので、１つのＬＥＤから照射される光には異なる波長の光が含まれているが、ＬＥＤの製造コストが上昇すると共に各ＬＥＤに対応する光学レンズを備えているので、光照射ユニットの構造が複雑になり、製造コストが増加する。 Further, in Patent Document 1, since each LED is composed of a plurality of light emitting elements arranged in an array and having different light emitting wavelength ranges, the light emitted from one LED includes light having different wavelengths. However, since the manufacturing cost of the LED increases and the optical lens corresponding to each LED is provided, the structure of the light irradiation unit becomes complicated and the manufacturing cost increases.

一方、特許文献２には、複数のＬＥＤを互いに発光波長域が異なるものにすることが記載されているが、各ＬＥＤの光を平行光として出射するので、複数のＬＥＤが発する異なる波長域の光を同一領域に重ねて照射することができない。 On the other hand, Patent Document 2 describes that a plurality of LEDs have different emission wavelength ranges from each other. However, since the light of each LED is emitted as parallel light, the light emitted by the plurality of LEDs has different wavelength ranges. It is not possible to irradiate the same area with light.

本発明の目的は、簡単な構造で複数の発光素子の光を同一領域に重なるように照射することができる光照射ユニットを提供することである。 An object of the present invention is to provide a light irradiation unit capable of irradiating light from a plurality of light emitting elements so as to overlap the same region with a simple structure.

請求項１の発明の光照射ユニットは、楕円の第１焦点と第２焦点を通る長軸を回転軸として前記楕円を回転させて形成される回転楕円面の部分凹面を反射面とする凹面反射鏡と、前記凹面反射鏡の反射面に向けて発光面を発光させる複数の発光素子と、前記凹面反射鏡と前記複数の発光素子を固定するための基台を有し、前記凹面反射鏡は、前記回転軸方向両端側部分が夫々開放状に形成されると共に、前記凹面反射鏡の周壁部の前記第１焦点側端部が前記基台に固定され、前記複数の発光素子は、前記第１焦点の近傍において前記基台に対して同じ傾斜角で互いに異なる方向に向けて前記基台の中央部分に形成された複数の傾斜面に夫々固定され、前記複数の発光素子を発光させたときの光が、前記凹面反射鏡によって反射されて、前記回転軸方向の前記第２焦点よりも遠い位置で重なり合うように構成されたことを特徴としている。 The light irradiation unit according to the first aspect of the present invention has concave reflection having a partially concave surface of a rotating elliptical surface formed by rotating the ellipse with a long axis passing through the first focus and the second focal point of the ellipse as a reflection surface. The concave reflecting mirror has a mirror, a plurality of light emitting elements that emit light toward the reflecting surface of the concave reflecting mirror, and a base for fixing the concave reflecting mirror and the plurality of light emitting elements. The both end portions in the rotation axis direction are formed in an open shape, and the first focal point side end portion of the peripheral wall portion of the concave reflector is fixed to the base, and the plurality of light emitting elements are the first. When the plurality of light emitting elements are made to emit light by being fixed to a plurality of inclined surfaces formed in the central portion of the base in the vicinity of one focal point with the same inclination angle and different directions with respect to the base. The light is reflected by the concave reflector and is configured to overlap at a position farther than the second focal point in the rotation axis direction.

上記構成によれば、回転楕円面の部分凹面を反射面とする凹面反射鏡の第１焦点の近傍に配設された複数の発光素子から、凹面反射鏡の反射面に向けて互いに異なる方向に光が出射される。回転楕円面の性質により、第１焦点近傍の複数の発光素子から出射された光は、凹面反射鏡によって第２焦点の近傍に向けて反射され、凹面反射鏡の第２焦点側の開放端から外部に照射される。このとき、凹面反射鏡によって反射された複数の発光素子の光の大部分は、互いに平行にはならず、凹面反射鏡の回転軸方向の第２焦点よりも遠い位置で重なり合う。従って、光学レンズを使用しない簡単な構造で複数の発光素子の光を同一領域に重ねて照射することができる。 According to the above configuration, a plurality of light emitting elements arranged in the vicinity of the first focal point of the concave reflecting mirror having the partially concave surface of the spheroid surface as the reflecting surface are directed in different directions toward the reflecting surface of the concave reflecting mirror. Light is emitted. Due to the nature of the spheroid, the light emitted from multiple light emitting elements near the first focal point is reflected by the concave reflector toward the vicinity of the second focal point, and is reflected from the open end on the second focal point side of the concave reflecting mirror. It is irradiated to the outside. At this time, most of the light of the plurality of light emitting elements reflected by the concave reflecting mirror is not parallel to each other and overlaps at a position farther than the second focal point in the rotation axis direction of the concave reflecting mirror. Therefore, it is possible to superimpose and irradiate the light of a plurality of light emitting elements on the same region with a simple structure that does not use an optical lens.

請求項２の発明の光照射ユニットは、請求項１の発明において、前記凹面反射鏡の離心率が０．８５～０．９５であることを特徴としている。
上記構成によれば、凹面反射鏡によって反射された光を凹面反射鏡の回転軸に対して平行に近づけることができ、複数の発光素子の光を同一領域に重ねて照射する範囲を回転軸方向に大きくすることができる。The light irradiation unit according to the second aspect of the present invention is characterized in that, in the first aspect of the present invention, the eccentricity of the concave reflecting mirror is 0.85 to 0.95.
According to the above configuration, the light reflected by the concave reflecting mirror can be brought close to parallel to the rotation axis of the concave reflecting mirror, and the range in which the light of a plurality of light emitting elements is superimposed on the same region and irradiated is in the rotation axis direction. Can be made larger.

請求項３の発明の光照射ユニットは、請求項１の発明において、前記複数の発光素子が互いに異なる波長の光を発することを特徴としている。
上記構成によれば、複数の発光素子から出射される異なる波長の光を同一領域に重ねて照射することができる。The light irradiation unit according to the third aspect of the present invention is characterized in that, in the first aspect of the present invention, the plurality of light emitting elements emit light having different wavelengths from each other.
According to the above configuration, it is possible to superimpose and irradiate the same region with light of different wavelengths emitted from a plurality of light emitting elements.

請求項４の発明の光照射ユニットは、請求項３の発明において、前記複数の発光素子が夫々発光ダイオードであることを特徴としている。
上記構成によれば、低発熱且つ長寿命の小型の発光素子を用いて、光照射ユニットを小型化することができる。The light irradiation unit according to the fourth aspect of the present invention is characterized in that, in the third aspect of the present invention, the plurality of light emitting elements are light emitting diodes, respectively.
According to the above configuration, the light irradiation unit can be miniaturized by using a small light emitting element having low heat generation and long life.

請求項５の発明の光照射ユニットは、請求項１の発明において、前記発光面の中心が前記第１焦点で前記回転軸と直交する焦点面内に位置するように、且つ前記発光面の法線が前記焦点面に対して前記第２焦点側に所定の傾斜角を有するように、前記複数の発光素子が夫々固定されたことを特徴としている。
上記構成によれば、凹面反射鏡の回転軸方向第１焦点側端部が開放状に形成されていても、発光素子から発する光の大部分を凹面反射鏡で反射させて、回転軸における第２焦点よりも遠い位置に到達させることができる。従って、発光素子の光を無駄にすることが無く、複数の発光素子の光を第２焦点よりも遠い位置に重ねて照射することができる。In the invention of claim 1, the light irradiation unit of the invention of claim 5 is a method of the light emitting surface so that the center of the light emitting surface is located in the focal plane orthogonal to the rotation axis at the first focal point. The plurality of light emitting elements are fixed to each other so that the line has a predetermined inclination angle on the second focal point side with respect to the focal plane.
According to the above configuration, even if the first focal point side end in the rotation axis direction of the concave reflector is formed in an open shape, most of the light emitted from the light emitting element is reflected by the concave reflector to be the second on the rotation axis. It is possible to reach a position farther than the two focal points. Therefore, the light of the light emitting element is not wasted, and the light of the plurality of light emitting elements can be superimposed and irradiated at a position farther than the second focal point.

請求項６の発明の光照射ユニットは、請求項５の発明において、前記所定の傾斜角が２０°～４５°であることを特徴としている。
上記構成によれば、照射領域を小さくして、強い光を照射することができる。The light irradiation unit according to the sixth aspect of the present invention is characterized in that, in the fifth aspect of the present invention, the predetermined inclination angle is 20 ° to 45 °.
According to the above configuration, the irradiation area can be reduced to irradiate strong light.

本発明の光照射ユニットによれば、簡単な構造で複数の発光素子の光を同一領域に重なるように照射することができる。 According to the light irradiation unit of the present invention, it is possible to irradiate the light of a plurality of light emitting elements so as to overlap the same region with a simple structure.

本発明の実施例１に係る光照射ユニットの平面図である。It is a top view of the light irradiation unit which concerns on Example 1 of this invention. 図１のII－II線断面図である。FIG. 2 is a sectional view taken along line II-II of FIG. 凹面反射鏡の形状を決める寸法の説明図である。It is explanatory drawing of the dimension which determines the shape of a concave reflector. 発光素子が発した光線の説明図である。It is explanatory drawing of the light ray emitted by a light emitting element. 図４の離隔距離を小さくした場合の光線の説明図である。It is explanatory drawing of the light ray when the separation distance of FIG. 4 is made small. 第２焦点からの距離と所定の照射領域における光の到達面積の割合を凹面反射鏡の離心率別に示す図である。It is a figure which shows the ratio of the distance from a 2nd focal point, and the arrival area of light in a predetermined irradiation area, by the eccentricity of a concave reflector. 凹面反射鏡の離心率と凹面反射鏡の短軸位置から所定距離だけ離隔した位置における光束径の関係を傾斜角別に示す図である。It is a figure which shows the relationship between the eccentricity of a concave reflector and the light flux diameter at a position separated by a predetermined distance from the minor axis position of a concave reflector for each tilt angle. 凹面反射鏡の離心率と傾斜角をパラメータとして凹面反射鏡の短軸位置から所定距離だけ離隔した位置における光束径を等高線プロットした図である。It is a figure which contour-line plots the luminous flux diameter at the position separated by a predetermined distance from the minor axis position of the concave reflector with the eccentricity and the tilt angle of the concave reflector as parameters. 発光素子数を増加させた例を示す支持部の斜視図である。It is a perspective view of the support part which shows the example which increased the number of light emitting elements.

以下、本発明を実施するための形態について実施例に基づいて説明する。 Hereinafter, embodiments for carrying out the present invention will be described with reference to examples.

図１、図２に示すように、光照射ユニット１は、凹面反射鏡１０と、この凹面反射鏡１０の反射面１１に向けて発光面２１側を発光させる複数の発光素子２０と、凹面反射鏡１０及び複数の発光素子２０を固定するための円盤状の基台３０を有する。 As shown in FIGS. 1 and 2, the light irradiation unit 1 includes a concave reflecting mirror 10, a plurality of light emitting elements 20 that emit light on the light emitting surface 21 side toward the reflecting surface 11 of the concave reflecting mirror 10, and concave reflection. It has a disk-shaped base 30 for fixing the mirror 10 and the plurality of light emitting elements 20.

基台３０は、複数の発光素子２０を固定するために基台３０の中心から基台３０の主面３１に対して垂直に延びる中心線ＣＬと同心状に基台３０の主面３１側の中央部分に形成された柱状の支持部３２を有する。また、この支持部３２から基台３０の主面３１に延びるように、１対の配線３３，３４が形成されている。そして、基台３０は、対応する配線３３，３４に接続された１対のリードピン３５，３６を有する。１対のリードピン３５，３６は、基台３０の主面３１側から基台３０を貫通して外部に延びている。 The base 30 is concentrically with the center line CL extending perpendicularly to the main surface 31 of the base 30 from the center of the base 30 in order to fix the plurality of light emitting elements 20 on the main surface 31 side of the base 30. It has a columnar support portion 32 formed in a central portion. Further, a pair of wirings 33 and 34 are formed so as to extend from the support portion 32 to the main surface 31 of the base 30. The base 30 has a pair of lead pins 35, 36 connected to the corresponding wirings 33, 34. A pair of lead pins 35, 36 penetrate the base 30 from the main surface 31 side of the base 30 and extend to the outside.

支持部３２に固定された複数の発光素子２０は、１対の配線３３，３４に例えば金属ワイヤによって夫々電気的に接続され、１対のリードピン３５，３６を介して夫々給電されたときに発光する。尚、複数の発光素子２０は１対のリードピン３５，３６を共用しているが、発光素子２０毎に１対のリードピンを備えていてもよく、例えば負極のリードピンを共用するように複数のリードピンを備えていてもよい。 The plurality of light emitting elements 20 fixed to the support portion 32 are electrically connected to the pair of wirings 33 and 34, for example, by metal wires, respectively, and emit light when power is supplied via the pair of lead pins 35 and 36, respectively. do. Although the plurality of light emitting elements 20 share a pair of lead pins 35 and 36, a pair of lead pins may be provided for each light emitting element 20, for example, a plurality of lead pins so as to share a negative electrode lead pin. May be provided.

支持部３２は、その先端部に、固定される複数の発光素子２０に対応する複数の傾斜面３７，３８を備えている。これらの傾斜面３７，３８は、先端側ほど支持部３２の中心線ＣＬに近づくように、基台３０の主面３１に対して一定の角度で傾斜し且つ互いに異なる方向に向けて形成されている。複数の発光素子２０は、発光面２１が傾斜面３７，３８と平行になる姿勢で対応する傾斜面３７，３８に固定されている。それ故、支持部３２に固定された複数の発光素子２０は、互いに異なる方向に光を出射する。 The support portion 32 is provided with a plurality of inclined surfaces 37, 38 corresponding to the plurality of fixed light emitting elements 20 at the tip portion thereof. These inclined surfaces 37 and 38 are formed so as to be inclined at a certain angle with respect to the main surface 31 of the base 30 and to be oriented in different directions so that the tip side is closer to the center line CL of the support portion 32. There is. The plurality of light emitting elements 20 are fixed to the corresponding inclined surfaces 37, 38 in a posture in which the light emitting surface 21 is parallel to the inclined surfaces 37, 38. Therefore, the plurality of light emitting elements 20 fixed to the support portion 32 emit light in different directions from each other.

複数の発光素子２０としては、小型で低発熱且つ長寿命の発光ダイオード（ＬＥＤ）が好ましい。また、複数の発光素子２０が、互いに異なる波長域（例えば赤外光領域と可視光領域）の光を発することが好ましい。 As the plurality of light emitting elements 20, a light emitting diode (LED) that is small in size, has low heat generation, and has a long life is preferable. Further, it is preferable that the plurality of light emitting elements 20 emit light in different wavelength ranges (for example, an infrared light region and a visible light region).

凹面反射鏡１０は、図３に示す楕円Ｅの第１焦点Ｆ１と第２焦点Ｆ２を通る長軸を回転軸ＡＲとしてこの楕円Ｅを回転させて形成される回転楕円面の部分凹面と、その外側に回転軸ＡＲと同軸状に形成された周壁部１２を有する。この凹面反射鏡１０は、例えば樹脂成形によって形成された周壁部１２の内側の回転楕円面の部分凹面に、例えば蒸着によって不図示の金属膜を形成して反射面１１としている。 The concave reflector 10 has a partially concave surface of a spheroid surface formed by rotating the ellipse E with a long axis passing through the first focal point F1 and the second focal point F2 of the ellipse E shown in FIG. 3 as the axis of rotation AR. It has a peripheral wall portion 12 formed coaxially with the rotation axis AR on the outside. In the concave reflecting mirror 10, for example, a metal film (not shown) is formed on a partially concave surface of a spheroidal surface inside a peripheral wall portion 12 formed by resin molding to form a reflecting surface 11.

楕円Ｅは、長軸の長さ２ａ（長径）と短軸Ｂの長さ２ｂ（短径）を設定することによって形状が設定される。長径と短径によって、長軸（回転軸ＡＲ）と短軸Ｂの交点Ｘから第１、第２焦点Ｆ１，Ｆ２までの距離ｃがｃ＝（ａ2－ｂ2）1/2のように算出され、楕円Ｅの離心率εがε＝（（ａ2－ｂ2）1/2）／ａのように算出される。The shape of the ellipse E is set by setting the length 2a (major axis) of the major axis and the length 2b (minor axis) of the minor axis B. Depending on the major axis and the minor axis, the distance c from the intersection X of the major axis (rotary axis AR) and the minor axis B to the first and second focal points F1 and F2 is c = (a 2 -b 2 ) 1/2 . It is calculated, and the eccentricity ε of the ellipse E is calculated as ε = ((a 2 -b 2 ) 1/2 ) / a.

図２、図３に示すように、凹面反射鏡１０は、回転軸方向両端部分が夫々開放状に形成され、周壁部１２の第１焦点Ｆ１側端部が基台３０に固定される。このとき、基台３０の支持部３２の中心線ＣＬと凹面反射鏡１０の回転軸ＡＲとが一致して、凹面反射鏡１０の第１焦点Ｆ１が支持部３２の先端又は内部に位置するように、基台３０に固定される。凹面反射鏡１０の第２焦点Ｆ２側端部は、凹面反射鏡１０の短軸Ｂの位置に、又は短軸Ｂの位置と第２焦点Ｆ２の間に位置するように形成されている。反射面１１は、第１焦点Ｆ１で回転軸ＡＲと直交する焦点面ＦＦよりも基台３０側まで延びている。 As shown in FIGS. 2 and 3, the concave reflector 10 is formed so that both end portions in the rotation axis direction are open, and the first focal point F1 side end portion of the peripheral wall portion 12 is fixed to the base 30. At this time, the center line CL of the support portion 32 of the base 30 and the rotation axis AR of the concave reflector 10 coincide with each other so that the first focal point F1 of the concave reflector 10 is located at the tip or inside of the support portion 32. It is fixed to the base 30. The second focal point F2 side end of the concave reflecting mirror 10 is formed so as to be located at the position of the short axis B of the concave reflecting mirror 10 or between the position of the short axis B and the second focal point F2. The reflection surface 11 extends to the base 30 side with respect to the focal plane FF orthogonal to the rotation axis AR at the first focal point F1.

支持部３２の各傾斜面３７，３８において、発光素子２０は、その発光面２１の中心が焦点面ＦＦ内に位置するように、且つ発光面２１の法線Ｎが焦点面ＦＦに対して第２焦点Ｆ２側に所定の傾斜角αを有するように固定されている。また、これら発光素子２０は、発光面２１の中心が第１焦点Ｆ１から回転軸ＡＲと直交する方向に所定の離隔距離ｄだけ夫々離隔するように固定されている。傾斜角αは２０°～４５°の範囲内で選択された角度（例えばα＝４５°）に設定されている。尚、焦点面ＦＦは基台３０の主面３１と平行であり、傾斜面３７，３８の主面３１に対する一定の角度は（９０°－α）である。 In each of the inclined surfaces 37 and 38 of the support portion 32, the light emitting element 20 has the center of the light emitting surface 21 located in the focal plane FF, and the normal line N of the light emitting surface 21 is the third with respect to the focal plane FF. It is fixed so as to have a predetermined inclination angle α on the bifocal F2 side. Further, these light emitting elements 20 are fixed so that the center of the light emitting surface 21 is separated from the first focal point F1 by a predetermined separation distance d in the direction orthogonal to the rotation axis AR. The tilt angle α is set to an angle selected within the range of 20 ° to 45 ° (for example, α = 45 °). The focal plane FF is parallel to the main surface 31 of the base 30, and the constant angle of the inclined surfaces 37 and 38 with respect to the main surface 31 is (90 ° −α).

図４において、凹面反射鏡１０の反射面１１は、長径が８ｍｍ（ａ＝４ｍｍ）、短径が４．２２ｍｍ（ｂ＝２．１１ｍｍ）、離心率ε＝０．８５の楕円Ｅの長軸を回転軸ＡＲとして、この楕円Ｅを回転させて形成される回転楕円面の部分凹面に形成されている。また、複数の発光素子２０は、発光面２１の中心が第１焦点Ｆ１から所定の離隔距離ｄとしてｄ＝０．６ｍｍだけ回転軸ＡＲと直交する方向に夫々離隔し、且つ所定の傾斜角α＝４５°となるように配設されている。 In FIG. 4, the reflecting surface 11 of the concave reflecting mirror 10 has a major axis of an ellipse E having a major axis of 8 mm (a = 4 mm), a minor axis of 4.22 mm (b = 2.11 mm), and an eccentricity ε = 0.85. Is a rotation axis AR, and is formed on a partially concave surface of a spheroid surface formed by rotating this ellipse E. Further, the plurality of light emitting elements 20 are each separated from the center of the light emitting surface 21 in a direction orthogonal to the rotation axis AR by a predetermined separation distance d as a predetermined separation distance d, and a predetermined inclination angle α. It is arranged so that = 45 °.

離隔距離ｄは、複数の発光素子２０が互いに干渉せず、且つ凹面反射鏡１０とも干渉しないように、反射面１１の基礎となる楕円Ｅの長径と短径に基づいて設定される。図４の場合、焦点面ＦＦにおける第１焦点Ｆ１と反射面１１の距離は１．１ｍｍ程度であり、発光素子２０のサイズと傾斜角αを考慮して離隔距離ｄをｄ＝０．６ｍｍとしている。尚、この離隔距離ｄは、回転軸方向の第１焦点Ｆ１側において、回転軸ＡＲ上における第１焦点Ｆ１と楕円Ｅの距離（ａ－ｃ）に相当する。 The separation distance d is set based on the major axis and the minor axis of the ellipse E which is the basis of the reflecting surface 11 so that the plurality of light emitting elements 20 do not interfere with each other and also interfere with the concave reflecting mirror 10. In the case of FIG. 4, the distance between the first focal point F1 and the reflecting surface 11 in the focal plane FF is about 1.1 mm, and the separation distance d is set to d = 0.6 mm in consideration of the size of the light emitting element 20 and the inclination angle α. There is. The separation distance d corresponds to the distance (ac) between the first focal point F1 and the ellipse E on the rotation axis AR on the first focal point F1 side in the rotation axis direction.

このように構成された光照射ユニット１を発光させたときに、発光素子２０は発光面２１の法線方向に光を出射する。この光は、例えば２０°の発散角（半角）を有し、凹面反射鏡１０の反射面１１に向かって円錐状に広がりながら進行する。図４では、１つの発光素子２０から出射される法線方向の光線と、円錐側面に相当する２本の光線を示している。短軸Ｂの位置から照射対象（検体）の位置までの距離を距離Ｈとし、第２焦点Ｆ２から照射対象の位置までの距離を距離ｈとする。 When the light irradiation unit 1 configured in this way emits light, the light emitting element 20 emits light in the normal direction of the light emitting surface 21. This light has a divergence angle (half angle) of, for example, 20 °, and travels while spreading in a conical shape toward the reflecting surface 11 of the concave reflecting mirror 10. FIG. 4 shows a light ray in the normal direction emitted from one light emitting element 20 and two light rays corresponding to the side surface of the cone. The distance from the position of the short axis B to the position of the irradiation target (specimen) is defined as the distance H, and the distance from the second focal point F2 to the position of the irradiation target is defined as the distance h.

楕円の性質により、例えば第１焦点Ｆ１から出射した光は、凹面反射鏡１０の反射面１１で反射されて第２焦点Ｆ２に到達する。一方、第１焦点Ｆ１の近傍の複数の発光素子２０から出射した光は凹面反射鏡１０によって第２焦点Ｆ２側に向けて反射され、そのうちの一部が回転軸方向の第２焦点Ｆ２よりも遠い位置で重なり合う。 Due to the elliptical nature, for example, the light emitted from the first focal point F1 is reflected by the reflecting surface 11 of the concave reflecting mirror 10 and reaches the second focal point F2. On the other hand, the light emitted from the plurality of light emitting elements 20 in the vicinity of the first focal point F1 is reflected toward the second focal point F2 side by the concave reflecting mirror 10, and a part of the light is reflected toward the second focal point F2 side in the rotation axis direction. Overlap at distant positions.

離隔距離ｄは、要求される光の照射態様に応じて適宜設定可能であり、離隔距離ｄに応じた支持部３２を形成する。図５に示すように、図４の凹面反射鏡１０に対して離隔距離ｄを例えば０．３２ｍｍとした場合には、光を重ねて照射する位置が、図４の離隔距離ｄが０．６ｍｍの場合と比べて第２焦点Ｆ２に近づく。離隔距離ｄが小さいほど発光素子２０が第１焦点Ｆ１に近づいて、光が第２焦点Ｆ２に近い位置に到達するためである。それ故、照射対象の位置を光照射ユニット１に近づけて設定する場合には、離隔距離ｄを小さくする。また、離隔距離ｄを小さくすることにより照射対象の位置が光照射ユニット１に近くなり、光が大きく広がる前の強い光を照射することができる。 The separation distance d can be appropriately set according to the required light irradiation mode, and forms the support portion 32 according to the separation distance d. As shown in FIG. 5, when the separation distance d is set to, for example, 0.32 mm with respect to the concave reflector 10 of FIG. 4, the position where the light is superimposed and irradiated is the position where the separation distance d of FIG. 4 is 0.6 mm. It is closer to the second focal point F2 than in the case of. This is because the smaller the separation distance d, the closer the light emitting element 20 is to the first focal point F1, and the light reaches a position closer to the second focal point F2. Therefore, when the position of the irradiation target is set close to the light irradiation unit 1, the separation distance d is reduced. Further, by reducing the separation distance d, the position of the irradiation target becomes closer to the light irradiation unit 1, and it is possible to irradiate strong light before the light spreads greatly.

図６は、長径が８ｍｍで一定且つ短径が異なるため楕円Ｅの形状が異なる場合、即ち離心率εが異なる場合に、距離ｈと回転軸ＡＲ周りの所定領域（直径２ｍｍの領域）における光が到達する領域の割合（到達効率）の関係を、離心率別に示している。尚、発光素子２０の離隔距離ｄは０．３２ｍｍ、傾斜角αは４５°としている。到達効率が高いほど、所定領域において複数の発光素子２０の光が重なる領域が大きくなり、到達効率が１００％の場合に所定領域の全体で複数の発光素子２０の光が重なることになる FIG. 6 shows light in a predetermined region (region with a diameter of 2 mm) around the distance h and the rotation axis AR when the shape of the ellipse E is different because the major axis is 8 mm and the minor axis is different, that is, when the eccentricity ε is different. The relationship of the ratio of the areas reached by (arrival efficiency) is shown for each eccentricity. The separation distance d of the light emitting element 20 is 0.32 mm, and the inclination angle α is 45 °. The higher the reach efficiency, the larger the region where the light of the plurality of light emitting elements 20 overlaps in the predetermined region, and when the reach efficiency is 100%, the light of the plurality of light emitting elements 20 overlaps in the entire predetermined region.

また、離心率εが小さいほど高い到達効率が得られる距離ｈの範囲が小さくなり、距離ｈの増加に対する到達効率の減少も急激になる。離心率εが小さいほど、光が大きい入射角で所定領域に到達するようになるためである。一方、離心率εが大きいほど複数の発光素子２０の光を重ね合わせて照射できる範囲が回転軸方向に拡大される。離心率εが大きいほど、反射面１１で反射された光と回転軸ＡＲとが平行に近づいて、光が小さい入射角で所定領域に到達するためである。 Further, the smaller the eccentricity ε, the smaller the range of the distance h from which a high reaching efficiency can be obtained, and the sharper the decrease in the reaching efficiency with respect to the increase in the distance h. This is because the smaller the eccentricity ε, the more the light reaches a predetermined region at a larger incident angle. On the other hand, as the eccentricity ε is larger, the range in which the light of the plurality of light emitting elements 20 can be superimposed and irradiated is expanded in the direction of the rotation axis. This is because the larger the eccentricity ε, the closer the light reflected by the reflecting surface 11 and the rotation axis AR approach in parallel, and the light reaches a predetermined region at a small incident angle.

照射対象が、回転軸方向にある程度の大きさを有する場合には、高い到達効率が得られる距離ｈの範囲が大きいことが好ましく、大きい離心率（例えばε＝０．８５～０．９５）の凹面反射鏡１０が好ましい。長径が８ｍｍ、離心率εが０．９５の凹面反射鏡１０では、焦点面ＦＦにおける第１焦点Ｆ１と反射面１１の距離が０．４ｍｍ程度に小さくなるので、これよりも大きい離心率の凹面反射鏡１０では複数の発光素子２０を干渉しないように配設することが困難である。尚、小型化については制限されるが、離心率εが０．９５よりも大きい凹面反射鏡に対して複数の発光素子を配設可能なように、上記よりも大きい凹面反射鏡を装備した光照射ユニットを形成することも可能である。 When the irradiation target has a certain size in the direction of the axis of rotation, it is preferable that the range of the distance h where high arrival efficiency can be obtained is large, and the eccentricity is large (for example, ε = 0.85 to 0.95). The concave reflector 10 is preferable. In the concave reflector 10 having a major axis of 8 mm and an eccentricity ε of 0.95, the distance between the first focal point F1 and the reflecting surface 11 on the focal plane FF is as small as about 0.4 mm, so that the concave surface having a larger eccentricity is In the reflector 10, it is difficult to arrange the plurality of light emitting elements 20 so as not to interfere with each other. Although the miniaturization is limited, light equipped with a concave reflector larger than the above so that a plurality of light emitting elements can be arranged for a concave reflector having an eccentricity ε larger than 0.95. It is also possible to form an irradiation unit.

図７は、凹面反射鏡１０の短軸Ｂの位置から照射対象の位置までの距離Ｈを一定（Ｈ＝８ｍｍ）にした場合に、凹面反射鏡１０の離心率εと、距離Ｈにおける凹面反射鏡１０によって反射された光の照射領域の幅（図４，５のｗに相当する）との関係を発光面２１の傾斜角別に示している。例えば傾斜角αが４５°の場合に、離心率εが０．８から大きくなるほど照射領域の幅が小さくなり、離心率ε０．８９程度で最小になる。そして、離心率εが０．８９よりも大きくなると、照射領域の幅が大きくなる。また、傾斜角αが小さくなるほど、照射領域の幅が小さくなる傾向がある。要求される照射態様を実現する光照射ユニット１を形成する際に、この図７に示す関係を利用することができる。 FIG. 7 shows the eccentricity ε of the concave reflector 10 and the concave reflection at the distance H when the distance H from the position of the short axis B of the concave reflector 10 to the position of the irradiation target is constant (H = 8 mm). The relationship with the width of the irradiation region of the light reflected by the mirror 10 (corresponding to w in FIGS. 4 and 5) is shown for each inclination angle of the light emitting surface 21. For example, when the inclination angle α is 45 °, the width of the irradiation region becomes smaller as the eccentricity ε increases from 0.8, and becomes the minimum when the eccentricity ε is about 0.89. When the eccentricity ε becomes larger than 0.89, the width of the irradiation region becomes large. Further, as the inclination angle α becomes smaller, the width of the irradiation region tends to become smaller. The relationship shown in FIG. 7 can be utilized when forming the light irradiation unit 1 that realizes the required irradiation mode.

図８は、凹面反射鏡１０の離心率εと発光面２１の傾斜角αをパラメータとして、距離Ｈ＝８ｍｍの位置における照射領域の幅について等高線プロットしたものであり、図７の内容を含んでいる。この図８から、離心率εが０．８５～０．９５、傾斜角αが２０°～４５°の範囲内では、光の照射領域に光を集中させて照射可能であることが分かる。要求される照射態様を実現する光照射ユニット１の凹面反射鏡１０の離心率εと発光面２１の傾斜角αを設定する際に、この図８に示す関係を利用することができる。 FIG. 8 is a contour plot of the width of the irradiation region at a position where the distance H = 8 mm, with the eccentricity ε of the concave reflector 10 and the inclination angle α of the light emitting surface 21 as parameters, and includes the contents of FIG. There is. From FIG. 8, it can be seen that when the eccentricity ε is in the range of 0.85 to 0.95 and the inclination angle α is in the range of 20 ° to 45 °, the light can be concentrated and irradiated in the light irradiation region. The relationship shown in FIG. 8 can be used when setting the eccentricity ε of the concave reflector 10 of the light irradiation unit 1 and the inclination angle α of the light emitting surface 21 to realize the required irradiation mode.

図９は、支持部３２に形成された４つの傾斜面に発光素子２０が夫々配設された例を示している。この例のように、発光素子２０の数は、例えば要求される波長域、光の強さに応じて、適宜設定することができる。そして、このような場合でも、凹面反射鏡１０は回転楕円面の部分凹面を反射面１１としているので、複数の発光素子２０の光を重ねて照射することができる。尚、支持部３２の傾斜面の発光素子２０に加えて、この支持部３２の先端に第２焦点Ｆ２に向けて光を発する発光素子を配設してもよい。 FIG. 9 shows an example in which the light emitting element 20 is arranged on each of the four inclined surfaces formed on the support portion 32. As in this example, the number of light emitting elements 20 can be appropriately set according to, for example, a required wavelength range and light intensity. Even in such a case, since the concave reflecting mirror 10 has the partially concave surface of the spheroid as the reflecting surface 11, the light of the plurality of light emitting elements 20 can be overlapped and irradiated. In addition to the light emitting element 20 on the inclined surface of the support portion 32, a light emitting element that emits light toward the second focal point F2 may be arranged at the tip of the support portion 32.

上記光照射ユニット１の作用、効果について説明する。
回転楕円面の部分凹面を反射面１１とする凹面反射鏡１０の第１焦点Ｆ１の近傍に配設された複数の発光素子２０から、凹面反射鏡１０の反射面１１に向けて互いに異なる方向に光が出射される。回転楕円面の性質により、第１焦点Ｆ１の近傍の複数の発光素子２０から出射された光は、凹面反射鏡１０によって第２焦点Ｆ２の近傍に向けて反射され、凹面反射鏡１０の第２焦点Ｆ２側の開放端から外部に照射される。このとき、凹面反射鏡１０によって反射された複数の発光素子２０の光の大部分は互いに平行にならず、凹面反射鏡１０の回転軸方向の第２焦点Ｆ２よりも遠い位置で重なり合う。従って、光学レンズを使用しない簡単な構造で複数の発光素子２０の光を同一領域に重ねて照射することができる。The operation and effect of the light irradiation unit 1 will be described.
A plurality of light emitting elements 20 arranged in the vicinity of the first focal point F1 of the concave reflecting mirror 10 having the partially concave surface of the spheroid surface as the reflecting surface 11 in different directions toward the reflecting surface 11 of the concave reflecting mirror 10. Light is emitted. Due to the nature of the spheroid surface, the light emitted from the plurality of light emitting elements 20 in the vicinity of the first focal point F1 is reflected by the concave reflecting mirror 10 toward the vicinity of the second focal point F2, and the second of the concave reflecting mirror 10. It is irradiated to the outside from the open end on the focal point F2 side. At this time, most of the light of the plurality of light emitting elements 20 reflected by the concave reflecting mirror 10 is not parallel to each other and overlaps at a position farther than the second focal point F2 in the rotation axis direction of the concave reflecting mirror 10. Therefore, it is possible to superimpose and irradiate the light of a plurality of light emitting elements 20 on the same region with a simple structure that does not use an optical lens.

凹面反射鏡１０の離心率εがε＝０．８５～０．９５なので、凹面反射鏡１０によって反射された光を凹面反射鏡１０の回転軸ＡＲに対して平行に近づけることができる。それ故、複数の発光素子２０の光を同一領域に重ねて照射する範囲を回転軸方向に大きくすることができる。 Since the eccentricity ε of the concave reflector 10 is ε = 0.85 to 0.95, the light reflected by the concave reflector 10 can be brought close to parallel to the rotation axis AR of the concave reflector 10. Therefore, the range in which the light of the plurality of light emitting elements 20 is superimposed on the same region and irradiated can be increased in the direction of the rotation axis.

複数の発光素子２０が互いに異なる波長の光を発する場合には、複数の発光素子２０から出射される異なる波長の光を同一領域に重ねて照射することができる。これら複数の発光素子２０は、低発熱且つ長寿命の小型の発光ダイオードなので、光照射ユニット１を小型化することができる。 When a plurality of light emitting elements 20 emit light having different wavelengths from each other, light of different wavelengths emitted from the plurality of light emitting elements 20 can be superimposed and irradiated on the same region. Since these plurality of light emitting elements 20 are small light emitting diodes having low heat generation and long life, the light irradiation unit 1 can be miniaturized.

発光面２１の中心が第１焦点Ｆ１で回転軸ＡＲと直交する焦点面ＦＦ内に位置するように、且つ発光面２１の法線Ｎが焦点面ＦＦに対して第２焦点Ｆ２側に所定の傾斜角αを有するように、複数の発光素子２０が支持部３２の対応する傾斜面３７，３８に夫々固定されている。従って、凹面反射鏡１０の回転軸方向の第１焦点側端部が開放状に形成されていても、発光素子２０から発する光の大部分を凹面反射鏡１０で反射させて、回転軸方向の第２焦点Ｆ２よりも遠い位置に到達させることができる。それ故、発光素子２０の光を無駄にすることが無く、複数の発光素子２０の光を第２焦点Ｆ２よりも遠い位置に重ねて照射することができる。また、所定の傾斜角αがα＝２０°～４５°なので、照射領域の幅を小さくして、強い光を照射することができる。 The center of the light emitting surface 21 is located in the focal plane FF orthogonal to the rotation axis AR at the first focal point F1, and the normal line N of the light emitting surface 21 is predetermined on the second focal point F2 side with respect to the focal plane FF. A plurality of light emitting elements 20 are fixed to the corresponding inclined surfaces 37 and 38 of the support portion 32, respectively, so as to have an inclination angle α. Therefore, even if the first focal point side end portion in the rotation axis direction of the concave reflector 10 is formed in an open shape, most of the light emitted from the light emitting element 20 is reflected by the concave reflector 10 in the rotation axis direction. It is possible to reach a position farther than the second focal point F2. Therefore, the light of the light emitting element 20 is not wasted, and the light of the plurality of light emitting elements 20 can be superimposed and irradiated at a position farther than the second focal point F2. Further, since the predetermined inclination angle α is α = 20 ° to 45 °, the width of the irradiation region can be reduced to irradiate strong light.

複数の発光素子２０は、発光面２１の中心が第１焦点Ｆ１から回転軸ＡＲと直交する方向に、凹面反射鏡１０の長径と短径に基づいて設定された離隔距離ｄだけ離隔するように、支持部３２の対応する傾斜面３７，３８に夫々固定されている。これにより、複数の発光素子２０を互いに干渉しないように且つ凹面反射鏡１０と干渉しないように第１焦点Ｆ１の近傍に配設することができ、第１焦点Ｆ１の近傍の点から出射された発光素子２０の光を第２焦点Ｆ２の近傍に到達させることができる。 The plurality of light emitting elements 20 are separated by the separation distance d set based on the major axis and the minor axis of the concave reflecting mirror 10 in the direction in which the center of the light emitting surface 21 is orthogonal to the rotation axis AR from the first focal point F1. , Are fixed to the corresponding inclined surfaces 37 and 38 of the support portion 32, respectively. As a result, the plurality of light emitting elements 20 can be arranged in the vicinity of the first focal point F1 so as not to interfere with each other and the concave reflecting mirror 10, and the light is emitted from a point in the vicinity of the first focal point F1. The light of the light emitting element 20 can reach the vicinity of the second focal point F2.

その他、当業者であれば、本発明の趣旨を逸脱することなく、上記実施形態に種々の変更を付加した形態で実施可能であり、本発明はその種の変更形態も包含するものである。 In addition, a person skilled in the art can carry out the embodiment in a form in which various modifications are added to the above embodiment without departing from the spirit of the present invention, and the present invention also includes such modified embodiments.

１ ：光照射ユニット
１０ ：凹面反射鏡
１１ ：反射面
１２ ：周壁部
２０ ：発光素子
２１ ：発光面
３０ ：基台
３１ ：主面
３２ ：支持部
３３，３４ ：配線
３５，３６ ：リードピン
３７，３８ ：傾斜面1: Light irradiation unit 10: Concave reflector 11: Reflective surface 12: Peripheral wall portion 20: Light emitting element 21: Light emitting surface 30: Base 31: Main surface 32: Support portion 33, 34: Wiring 35, 36: Lead pin 37, 38: Inclined surface

Claims (6)

楕円の第１焦点と第２焦点を通る長軸を回転軸として前記楕円を回転させて形成される回転楕円面の部分凹面を反射面とする凹面反射鏡と、
前記凹面反射鏡の反射面に向けて発光面を発光させる複数の発光素子と、
前記凹面反射鏡と前記複数の発光素子を固定するための基台を有し、
前記凹面反射鏡は、前記回転軸方向両端側部分が夫々開放状に形成されると共に、前記凹面反射鏡の周壁部の前記第１焦点側端部が前記基台に固定され、
前記複数の発光素子は、前記第１焦点の近傍において前記基台に対して同じ傾斜角で互いに異なる方向に向けて前記基台の中央部分に形成された複数の傾斜面に夫々固定され、
前記複数の発光素子を発光させたときの光が、前記凹面反射鏡によって反射されて、前記回転軸方向の前記第２焦点よりも遠い位置で重なり合うように構成されたことを特徴とする光照射ユニット。A concave reflector having a partially concave surface of a spheroid formed by rotating the ellipse as a rotation axis with a long axis passing through the first focus and the second focus of the ellipse as a reflection surface.
A plurality of light emitting elements that emit light toward the reflecting surface of the concave reflecting mirror, and
It has a base for fixing the concave reflector and the plurality of light emitting elements, and has a base.
In the concave reflector, both end portions in the rotation axis direction are formed in an open shape, and the first focal point side end portion of the peripheral wall portion of the concave reflector is fixed to the base.
The plurality of light emitting elements are fixed to a plurality of inclined surfaces formed in the central portion of the base in the vicinity of the first focal point at the same inclination angle and in different directions with respect to the base.
The light irradiation when the plurality of light emitting elements are made to emit light is reflected by the concave reflecting mirror and is configured to overlap at a position farther than the second focal point in the direction of the rotation axis. unit. 前記凹面反射鏡の離心率が０．８５～０．９５であることを特徴とする請求項１に記載の光照射ユニット。 The light irradiation unit according to claim 1, wherein the concave reflector has an eccentricity of 0.85 to 0.95. 前記複数の発光素子が互いに異なる波長の光を発することを特徴とする請求項１に記載の光照射ユニット。 The light irradiation unit according to claim 1, wherein the plurality of light emitting elements emit light having different wavelengths from each other. 前記複数の発光素子が夫々発光ダイオードであることを特徴とする請求項３に記載の光照射ユニット。 The light irradiation unit according to claim 3, wherein each of the plurality of light emitting elements is a light emitting diode. 前記発光面の中心が前記第１焦点で前記回転軸と直交する焦点面内に位置するように、且つ前記発光面の法線が前記焦点面に対して前記第２焦点側に所定の傾斜角を有するように、前記複数の発光素子が夫々固定されたことを特徴とする請求項１に記載の光照射ユニット。 A predetermined tilt angle so that the center of the light emitting surface is located in the focal plane orthogonal to the axis of rotation at the first focal point, and the normal of the light emitting surface is on the second focal point side with respect to the focal plane. The light irradiation unit according to claim 1, wherein the plurality of light emitting elements are fixed to each other so as to have. 前記所定の傾斜角が２０°～４５°であることを特徴とする請求項５に記載の光照射ユニット。 The light irradiation unit according to claim 5, wherein the predetermined tilt angle is 20 ° to 45 °.
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