JP2012047872A - Light source device - Google Patents

Light source device Download PDF

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JP2012047872A
JP2012047872A JP2010188150A JP2010188150A JP2012047872A JP 2012047872 A JP2012047872 A JP 2012047872A JP 2010188150 A JP2010188150 A JP 2010188150A JP 2010188150 A JP2010188150 A JP 2010188150A JP 2012047872 A JP2012047872 A JP 2012047872A
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light
dichroic mirror
light source
led
emitted
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JP5648372B2 (en
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Takeo Matsushima
竹夫 松島
Kiyoyuki Kaburagi
清幸 蕪木
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Ushio Denki KK
Ushio Inc
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Ushio Denki KK
Ushio Inc
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Priority to TW100123668A priority patent/TWI521162B/en
Priority to KR1020110071476A priority patent/KR101444508B1/en
Priority to CN201110237000.XA priority patent/CN102385162B/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/70383—Direct write, i.e. pattern is written directly without the use of a mask by one or multiple beams
    • G03F7/70391—Addressable array sources specially adapted to produce patterns, e.g. addressable LED arrays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
    • G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/70008—Production of exposure light, i.e. light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/70216—Mask projection systems
    • G03F7/70233—Optical aspects of catoptric systems, i.e. comprising only reflective elements, e.g. extreme ultraviolet [EUV] projection systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically
    • G03F9/70—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically for microlithography
    • G03F9/7065—Production of alignment light, e.g. light source, control of coherence, polarization, pulse length, wavelength

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Led Device Packages (AREA)
  • Projection Apparatus (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which has a configuration to emit light by combining radiation light beams of multiple LED light sources and which emits light of a continuous wide wavelength range including a plurality of wavelength peaks and further provides a high luminance.SOLUTION: The light source device emits light by combining radiation light beams of three or more LED light sources having different peak wavelengths. The light source device includes a first dichroic mirror that combines a radiation light beam from a first LED light source with a radiation light beam from a second LED light source, and a second dichroic mirror that combines the combined light beam from the first dichroic mirror with a radiation light beam from a third LED light source. The second dichroic mirror reflects the combined light beam provided by the first dichroic mirror and transmits the radiation light beam from the third LED light source so as to obtain the combined light beam.

Description

本発明は、例えば、半導体や液晶基板、カラーフィルター等の製造工程における露光処理を行うに際しての露光用光源、あるいは、プロジェクタ装置における光源として用いられる光源装置に関する。   The present invention relates to a light source for exposure when performing an exposure process in a manufacturing process of a semiconductor, a liquid crystal substrate, a color filter, or the like, or a light source device used as a light source in a projector apparatus.

例えば、半導体や液晶基板、カラーフィルター等の製造工程における露光処理を行うに際して用いられる露光用光源として、図４に示すような、紫外線波長域のＬＥＤ素子の複数のものが面状に配置されてなるＬＥＤ発光部８０を有し、当該ＬＥＤ発光部８０から放射される放射光を適宜の集光光学系により集光して露光面Ｓに出射する構成とされた光源装置が知られている（例えば特許文献１参照。）。図４において、符号８１は楕円面反射鏡、８２は球面レンズ、８３は円錐反射鏡、８４は透光性ロッド、８５はコンデンサレンズ、８６はリレーレンズである。   For example, as an exposure light source used when performing an exposure process in a manufacturing process of a semiconductor, a liquid crystal substrate, a color filter or the like, a plurality of LED elements in an ultraviolet wavelength region as shown in FIG. There is known a light source device that has an LED light emitting unit 80, and that is configured to condense radiated light emitted from the LED light emitting unit 80 by an appropriate condensing optical system and emit it to the exposure surface S ( For example, see Patent Document 1.) In FIG. 4, reference numeral 81 is an elliptical reflecting mirror, 82 is a spherical lens, 83 is a conical reflecting mirror, 84 is a translucent rod, 85 is a condenser lens, and 86 is a relay lens.

しかしながら、このような構成の光源装置では、ＬＥＤ素子のピーク波長を中心とした比較的波長範囲の狭い単色の光しか出射することができないので、例えば感光樹脂の個々の露光感度に応じた波長光が必要とされる、カラーフィルター等の製造工程における露光処理を行うための露光用光源として利用することはできない、という問題がある。
また、ＬＥＤ素子から放射された光が集光光学系により集光していく過程において種々のロスが生ずることとなって光の利用効率が低下し、十分に高い輝度の光を得ることができない、という問題がある。 However, since the light source device having such a configuration can emit only monochromatic light having a relatively narrow wavelength range centered on the peak wavelength of the LED element, for example, wavelength light corresponding to the individual exposure sensitivity of the photosensitive resin. Therefore, there is a problem that it cannot be used as an exposure light source for performing an exposure process in a manufacturing process of a color filter or the like.
In addition, various losses occur in the process of condensing the light emitted from the LED element by the condensing optical system, so that the light use efficiency is lowered and it is not possible to obtain sufficiently high luminance light. There is a problem.

一方、可視域の波長範囲において選ばれた互いに異なるピーク波長を有する複数のＬＥＤ光源の各々から放射される光を例えばダイクロイックミラーを用いて合成して出射する構成とされた光源装置が提案されている（例えば特許文献２参照。）。
この光源装置は、図５に示すように、可視域の所定の波長範囲内において互いに異なるピーク波長を有する３つのＬＥＤ光源９０Ａ，９０Ｂ，９０Ｃと、互いに波長選択特性の異なる第１のダイクロイックミラー９１および第２のダイクロイックミラー９２と、第１のＬＥＤ光源９０Ａ、第２のＬＥＤ光源９０Ｂおよび第３のＬＥＤ光源９０Ｃの各々の光放射方向前方側に配置された、ＬＥＤ光源からの放射光を平行光としてダイクロイックミラーに出射するコリメータレンズ９３とを有する。
この光源装置においては、第１のＬＥＤ光源９０Ａからの放射光が第１のダイクロイックミラー９１を透過した透過光に、第２のＬＥＤ光源９０Ｂからの放射光が第１のダイクロイックミラー９１により反射された反射光が合成され、さらに、第１のダイクロイックミラー９１による合成光が第２のダイクロイックミラー９２を透過した透過光に、第３のＬＥＤ光源９０Ｃからの放射光が第２のダイクロイックミラー９２により反射された反射光が合成される。 On the other hand, there has been proposed a light source device configured to synthesize and emit light emitted from each of a plurality of LED light sources having different peak wavelengths selected in a visible wavelength range using, for example, a dichroic mirror. (For example, refer to Patent Document 2).
As shown in FIG. 5, the light source device includes three LED light sources 90A, 90B, and 90C having different peak wavelengths within a predetermined wavelength range in the visible range, and a first dichroic mirror 91 having different wavelength selection characteristics. The second dichroic mirror 92 and the emitted light from the LED light source arranged in front of the light emitting direction of each of the first LED light source 90A, the second LED light source 90B, and the third LED light source 90C are parallel. A collimator lens 93 that emits light to the dichroic mirror.
In this light source device, the radiated light from the first LED light source 90A is reflected by the transmitted light that has passed through the first dichroic mirror 91, and the radiated light from the second LED light source 90B is reflected by the first dichroic mirror 91. The reflected light is combined, the combined light from the first dichroic mirror 91 is transmitted through the second dichroic mirror 92, and the emitted light from the third LED light source 90C is transmitted through the second dichroic mirror 92. The reflected reflected light is synthesized.

しかしながら、各々、ピーク波長が互いに異なる複数のＬＥＤ光源の各々から放射される放射光をダイクロイックミラーにより合成する場合には、複数個のＬＥＤ光源およびダイクロイックミラーを、単に、上記構成の光学系を構成するよう配置するだけでは、十分に高い輝度の光を出射することができないことが判明した。   However, when the emitted light emitted from each of the plurality of LED light sources having different peak wavelengths is synthesized by the dichroic mirror, the plurality of LED light sources and the dichroic mirror are simply configured as the optical system having the above configuration. It has been found that it is not possible to emit light having a sufficiently high luminance by simply arranging the light emitting elements.

特開２００７−０４１４６７号公報JP 2007-041467 A 特開２００１−０４２４３１号公報JP 2001-042431 A

本発明は、以上のような事情に基づいてなされたものであり、複数個のＬＥＤ光源の放射光を合成して出射する構成のものにおいて、複数のピーク波長を有する連続した広範囲の波長範囲の光を出射することができると共に高い輝度を得ることのできる光源装置を提供することを目的とする。   The present invention has been made on the basis of the above circumstances, and in a configuration that synthesizes and emits the emitted light of a plurality of LED light sources, a continuous wide wavelength range having a plurality of peak wavelengths. It is an object of the present invention to provide a light source device that can emit light and obtain high luminance.

本発明の光源装置は、ピーク波長が互いに異なる３つ以上のＬＥＤ光源と、
第１のＬＥＤ光源から放射された放射光と、第２のＬＥＤ光源から放射された放射光とを合成する第１のダイクロイックミラーと、
当該第１のダイクロイックミラーにより合成された合成光と、第３のＬＥＤ光源から放射される放射光とを合成する、前記第１のダイクロイックミラーと波長選択特性が異なる第２のダイクロイックミラーと
を有し、
前記第２のダイクロイックミラーは、前記第１のダイクロイックミラーにより得られる合成光を反射すると共に前記第３のＬＥＤ光源からの放射光を透過するものであることを特徴とする。 The light source device of the present invention includes three or more LED light sources having different peak wavelengths,
A first dichroic mirror that combines the emitted light emitted from the first LED light source and the emitted light emitted from the second LED light source;
A second dichroic mirror having a wavelength selection characteristic different from that of the first dichroic mirror, which combines the synthesized light synthesized by the first dichroic mirror and the radiated light emitted from the third LED light source; And
The second dichroic mirror reflects the combined light obtained by the first dichroic mirror and transmits the emitted light from the third LED light source.

本発明の光源装置によれば、第２のダイクロイックミラーが、第１のダイクロイックミラーにより得られる、第１のＬＥＤ光源からの放射光および第２のＬＥＤ光源からの放射光の合成光を反射すると共に第３のＬＥＤ光源からの放射光を透過するものであることにより、各々のＬＥＤ光源からの放射光がダイクロイックミラーを透過する透過回数の合計を可及的に少なくすることができるので、各々のダイクロイックミラーにおいては、光がダイクロイックミラーにより反射されることによる放射光量の減衰の程度に比して、光がダイクロイックミラーを透過することによる放射光量の減衰の程度は大きいことから、光の利用効率を一層高くすることができて十分に高い輝度を得ることができる。   According to the light source device of the present invention, the second dichroic mirror reflects the combined light of the emitted light from the first LED light source and the emitted light from the second LED light source, which is obtained by the first dichroic mirror. In addition, by transmitting the radiated light from the third LED light source, the total number of times the radiated light from each LED light source transmits through the dichroic mirror can be reduced as much as possible. In dichroic mirrors, the amount of attenuation of the amount of radiant light due to the light passing through the dichroic mirror is greater than the amount of attenuation of the radiant amount due to the light reflected by the dichroic mirror. Efficiency can be further increased and sufficiently high luminance can be obtained.

本発明の光源装置に係る光学系の一例における構成の概略を示す説明図である。It is explanatory drawing which shows the outline of a structure in an example of the optical system which concerns on the light source device of this invention. 第１のＬＥＤ素子からの放射光、第２のＬＥＤ素子からの放射光および第３のＬＥＤ素子からの放射光の合成光の分光分布曲線を概略的に示す説明図である。It is explanatory drawing which shows roughly the spectral distribution curve of the synthetic | combination light of the emitted light from a 1st LED element, the emitted light from a 2nd LED element, and the emitted light from a 3rd LED element. 本発明の光源装置に係る光学系の他の例における構成の概略を示す説明図である。It is explanatory drawing which shows the outline of a structure in the other example of the optical system which concerns on the light source device of this invention. 従来におけるＬＥＤ素子を用いた光源装置の一例における光学系の構成の概略を示す説明図である。It is explanatory drawing which shows the outline of a structure of the optical system in an example of the light source device using the conventional LED element. 従来におけるＬＥＤ素子を用いた光源装置の他の例における光学系の構成の概略を示す説明図である。It is explanatory drawing which shows the outline of a structure of the optical system in the other example of the light source device using the conventional LED element.

以下、本発明の実施の形態について詳細に説明する。
図１は、本発明の光源装置に係る光学系の一例における構成の概略を示す説明図である。
この光学系は、各々、互いに異なるピーク波長λ1 〔ｎｍ〕，λ2 〔ｎｍ〕およびλ3 〔ｎｍ〕（λ1 ＞λ2 ＞λ3 ）を有する光を放射する第１のＬＥＤ光源、第２のＬＥＤ光源および第３のＬＥＤ光源の３つのＬＥＤ光源の各々の放射光を合成するものである。
この光学系においては、（円）板状の第１のダイクロイックミラー５１および（円）板状の第２のダイクロイックミラー５６が、一方が他方に対して面方向に変位した位置において、第１のダイクロイックミラー５１の一面５１Ａと第２のダイクロイックミラー５６の他面５６Ｂとが互いに対向するよう配置されており、第１のＬＥＤ光源を構成する第１のＬＥＤ素子１０が、第１のダイクロイックミラー５１の一面側において、第１のＬＥＤ素子１０の光出射面１０Ａの中心軸Ｃ１が第１のダイクロイックミラー５１の一面５１Ａに対して傾斜した状態で、配置されている。
そして、第２のＬＥＤ光源を構成する第２のＬＥＤ素子２０が、第１のダイクロイックミラー５１の他面側において、第２のＬＥＤ素子２０の光出射面２０Ａの中心軸Ｃ２が、第１のダイクロイックミラー５１の一面５１Ａにおける、第１のＬＥＤ素子１０の光出射面１０Ａの中心軸Ｃ１上の位置と交わる状態で、第１のダイクロイックミラー５１の他面５１Ｂに対して傾斜して伸びるよう、配置されていると共に、第３のＬＥＤ光源を構成する第３のＬＥＤ素子３０が、第２のダイクロイックミラー５６の一面側において、第３のＬＥＤ素子３０の光出射面３０Ａの中心軸Ｃ３が、第２のダイクロイックミラー５６の他面５６Ｂにおける、第２のＬＥＤ素子２０の光出射面２０Ａの中心軸Ｃ２上の位置と交わる状態で、第２のダイクロイックミラー５６の一面５６Ａに対して傾斜して伸びるよう、配置されている。 Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is an explanatory diagram showing an outline of a configuration in an example of an optical system according to the light source device of the present invention.
The optical system includes a first LED light source that emits light having different peak wavelengths λ 1 [nm], λ 2 [nm] and λ 3 [nm] (λ 1 > λ 2 > λ 3 ), respectively. The emitted light of each of the three LED light sources of the second LED light source and the third LED light source is synthesized.
In this optical system, the first (circular) plate-shaped first dichroic mirror 51 and the second (circular) plate-shaped second dichroic mirror 56 are arranged in a position where one is displaced in the plane direction with respect to the other. One surface 51A of the dichroic mirror 51 and the other surface 56B of the second dichroic mirror 56 are arranged to face each other, and the first LED element 10 constituting the first LED light source is the first dichroic mirror 51. Is arranged in a state where the central axis C1 of the light emitting surface 10A of the first LED element 10 is inclined with respect to the one surface 51A of the first dichroic mirror 51.
And the 2nd LED element 20 which comprises a 2nd LED light source has the central axis C2 of 20 A of light-projection surfaces of the 2nd LED element 20 in the other surface side of the 1st dichroic mirror 51, 1st In a state where it intersects with the position on the central axis C1 of the light emitting surface 10A of the first LED element 10 on one surface 51A of the dichroic mirror 51, it extends so as to be inclined with respect to the other surface 51B of the first dichroic mirror 51. The third LED element 30 constituting the third LED light source is disposed on one surface side of the second dichroic mirror 56, and the central axis C3 of the light emitting surface 30A of the third LED element 30 is The second dichroic mirror 56 intersects with the position on the central axis C2 of the light emitting surface 20A of the second LED element 20 on the other surface 56B of the second dichroic mirror 56. So as to extend inclined to the one surface 56A of the mirror 56, it is disposed.

また、各々のＬＥＤ素子のエタンデュ（放射の面積×立体角）は、互いに同じ大きさとされていることが好ましく、これにより、各々のＬＥＤ素子からの放射光を効率よく合成することができる。   In addition, the etendue (radiation area × solid angle) of each LED element is preferably set to the same size, so that the emitted light from each LED element can be efficiently synthesized.

各々のＬＥＤ素子１０，２０，３０の光放射方向前方の位置には、それぞれ、ＬＥＤ素子１０（２０，３０）からの放射光を平行光として出射するコリメータレンズ６１（６２，６３）がその光軸がＬＥＤ素子１０（２０，３０）の光出射面１０Ａ（２０Ａ，３０Ａ）の中心軸Ｃ１（Ｃ２，Ｃ３）上に位置されるよう配置されており、第１のＬＥＤ素子１０からの放射光は、第１のコリメータレンズ６１によって略平行光とされて第１のダイクロイックミラー５１の一面５１Ａに照射される。また、第２のＬＥＤ素子２０からの放射光は、第２のコリメータレンズ６２によって略平行光とされて第１のダイクロイックミラー５１の他面５１Ｂに、第２のＬＥＤ素子２０からの放射光が第１のダイクロイックミラー５１を透過した透過光の出射領域が第１のＬＥＤ素子１０の放射光の照射領域に重なるよう、照射され、第３のＬＥＤ素子３０からの放射光は、第３のコリメータレンズ６３によって略平行光とされて第２のダイクロイックミラー５６の一面５６Ａに、第３のＬＥＤ素子３０からの放射光が第２のダイクロイックミラー５６を透過した透過光の出射領域が第１のダイクロイックミラー５１により合成された第１のＬＥＤ素子１０の放射光および第２のＬＥＤ素子２０の放射光の合成光の照射領域に重なるよう、照射される。   A collimator lens 61 (62, 63) that emits radiated light from the LED element 10 (20, 30) as parallel light is located at a position in front of the light emitting direction of each LED element 10, 20, 30. The axis is disposed so as to be positioned on the central axis C1 (C2, C3) of the light emitting surface 10A (20A, 30A) of the LED element 10 (20, 30), and the emitted light from the first LED element 10 Is collimated by the first collimator lens 61 and is irradiated onto one surface 51A of the first dichroic mirror 51. Also, the emitted light from the second LED element 20 is made substantially parallel light by the second collimator lens 62, and the emitted light from the second LED element 20 is applied to the other surface 51B of the first dichroic mirror 51. The transmitted light that has passed through the first dichroic mirror 51 is irradiated so that the emission area of the transmitted light overlaps the irradiation area of the emitted light of the first LED element 10, and the emitted light from the third LED element 30 is emitted from the third collimator. The first dichroic light is transmitted through the second dichroic mirror 56 on one surface 56A of the second dichroic mirror 56, which is made substantially parallel light by the lens 63, and is transmitted through the second dichroic mirror 56. It irradiates so that it may overlap with the irradiation area of the synthetic light of the radiation light of the 1st LED element 10 and the radiation light of the 2nd LED element 20 compounded by mirror 51

第１のダイクロイックミラー５１は、第１のＬＥＤ素子１０のピーク波長λ1 と第２のＬＥＤ素子２０のピーク波長λ2 との間の波長範囲内において反射−透過変換波長（境界波長）λ01（λ2 ＜λ01＜λ1 ）を有し、反射−透過変換波長λ01より長波長の光を反射し、反射−透過変換波長λ01より短波長の光を透過する波長選択特性を有する。
第２のダイクロイックミラー５６は、第２のＬＥＤ素子２０のピーク波長λ2 と第３のＬＥＤ素子３０のピーク波長λ3 との間の波長範囲内において反射−透過変換波長（境界波長）λ02（λ3 ＜λ02＜λ2 ）を有し、反射−透過変換波長λ02より長波長の光を反射し、反射−透過変換波長λ02より短波長の光を透過する波長選択特性を有する。 The first dichroic mirror 51 is reflected in the wavelength range between the peak wavelength lambda 1 and the peak wavelength lambda 2 of the second LED element 20 of the first LED element 10 - transparent translation Wavelength (boundary wavelength) lambda 01 (λ 2 <λ 01 <λ 1) has a reflection - from transparent translation wavelength lambda 01 reflects light of a long wavelength, the reflected - a wavelength selection characteristics for transmitting light having a shorter wavelength than the transmission conversion wavelength lambda 01 .
The second dichroic mirror 56, the reflection in the wavelength range between the peak wavelength lambda 2 and the peak wavelength lambda 3 of third LED elements 30 of the second LED element 20 - transparent translation Wavelength (boundary wavelength) lambda 02 (λ 3 <λ 02 <λ 2) has a reflection - from transparent translation wavelength lambda 02 reflects light of a long wavelength, the reflected - a wavelength selection characteristics for transmitting light having a shorter wavelength than the transmission conversion wavelength lambda 02 .

この光学系においては、第１のＬＥＤ素子１０からの放射光が第１のダイクロイックミラー５１の一面５１Ａによって反射された反射光に、第２のＬＥＤ素子２０からの放射光が第１のダイクロイックミラー５１を透過した透過光が合成され、第１のダイクロイックミラー５１による合成光が第２のダイクロイックミラー５６の他面５６Ｂによって反射された反射光に、第３のＬＥＤ素子３０からの放射光が第２のダイクロイックミラー５６を透過した透過光が合成され、これにより、図２に示すような、波長λ1 〔ｎｍ〕、λ2 〔ｎｍ〕およびλ3 〔ｎｍ〕の３つのピーク波長を有する連続した広い波長範囲の分光分布特性を有する合成光が出射される。 In this optical system, the emitted light from the first LED element 10 is reflected by the one surface 51A of the first dichroic mirror 51, and the emitted light from the second LED element 20 is reflected by the first dichroic mirror. The transmitted light that has passed through 51 is combined, the combined light from the first dichroic mirror 51 is reflected by the other surface 56B of the second dichroic mirror 56, and the emitted light from the third LED element 30 is the first light. The transmitted light that has passed through the two dichroic mirrors 56 is synthesized, and as a result, as shown in FIG. 2, continuous light having three peak wavelengths of wavelengths λ 1 [nm], λ 2 [nm], and λ 3 [nm] are obtained. The combined light having the spectral distribution characteristics in the wide wavelength range is emitted.

而して、このような光学系を備えた光源装置によれば、第２のダイクロイックミラー５６により、第１のＬＥＤ素子１０の放射光および第２のＬＥＤ素子２０の放射光の合成光を反射させると共に第３のＬＥＤ素子３０からの放射光を透過させて、第１のＬＥＤ素子１０の放射光、第２のＬＥＤ素子２０の放射光および第３のＬＥＤ素子３０からの放射光を合成する構成とされていることにより、第１のＬＥＤ素子１０の放射光、第２のＬＥＤ素子２０の放射光および第３のＬＥＤ素子３０の各々が第１のダイクロイックミラー５１および第２のダイクロイックミラー５６を透過する透過回数の合計を、例えば図５に示す構成のものに比して少なくすることができる。すなわち、図５に示す構成の光学系では、第１のＬＥＤ光源９０Ａの放射光がダイクロイックミラーを透過する回数が２回、第２のＬＥＤ光源９０Ｂの放射光がダイクロイックミラーを透過する回数が１回、第３のＬＥＤ光源９０Ｃの放射光がダイクロイックミラーを透過する回数が０回で、透過回数の合計が３回であるのに対して、上記の構成の光学系では、第１のＬＥＤ素子１０の放射光がダイクロイックミラーを透過する回数が０回、第２のＬＥＤ素子２０の放射光がダイクロイックミラーを透過する回数が１回、第３のＬＥＤ素子３０の放射光がダイクロイックミラーを透過する回数が１回で、透過回数の合計が２回となる。
従って、各々のダイクロイックミラーにおいては、光がダイクロイックミラーにより反射されることによる放射光量の減衰の程度に比して、光がダイクロイックミラーを透過することによる放射光量の減衰の程度は大きいので、ダイクロイックミラーを透過する透過回数の合計が可及的に少なくなる状態で構成されていることにより、光の利用効率を一層高くすることができて十分に高い輝度を得ることができる。 Thus, according to the light source device having such an optical system, the second dichroic mirror 56 reflects the combined light of the emitted light of the first LED element 10 and the emitted light of the second LED element 20. And transmitting the emitted light from the third LED element 30 to synthesize the emitted light of the first LED element 10, the emitted light of the second LED element 20, and the emitted light of the third LED element 30. By being configured, the first LED element 10 radiated light, the second LED element 20 radiated light, and the third LED element 30 are respectively the first dichroic mirror 51 and the second dichroic mirror 56. For example, the total number of times of transmission can be reduced as compared with the configuration shown in FIG. That is, in the optical system having the configuration shown in FIG. 5, the number of times that the emitted light of the first LED light source 90A passes through the dichroic mirror is 2, and the number of times that the emitted light of the second LED light source 90B passes through the dichroic mirror is 1. The number of times the emitted light of the third LED light source 90C passes through the dichroic mirror is zero, and the total number of times of transmission is three, whereas in the optical system configured as described above, the first LED element The number of times 10 emitted light passes through the dichroic mirror is 0, the number of times the emitted light of the second LED element 20 passes through the dichroic mirror is 1, and the emitted light of the third LED element 30 passes through the dichroic mirror. The number of times is 1, and the total number of times of transmission is 2.
Therefore, in each dichroic mirror, the amount of attenuation of the amount of radiant light caused by light passing through the dichroic mirror is greater than the amount of attenuation of the amount of radiant light reflected by the dichroic mirror. By being configured in a state where the total number of times of transmission through the mirror is as small as possible, the light utilization efficiency can be further increased and sufficiently high luminance can be obtained.

以上、本発明の光源装置の一実施形態について説明したが、本発明は、上記構成のものに限定されるものではない。   As mentioned above, although one Embodiment of the light source device of this invention was described, this invention is not limited to the thing of the said structure.

図３は、本発明の光源装置に係る光学系の他の例における構成の概略を示す説明図である。
この光学系は、各々、互いに異なるピーク波長λ1 〔ｎｍ〕，λ2 〔ｎｍ〕，λ3 〔ｎｍ〕およびλ4 〔ｎｍ〕（λ1 ＞λ2 ＞λ3 ＞λ4 ）を有する光を放射する第１のＬＥＤ光源１０１からの放射光、第２のＬＥＤ光源２０１からの放射光、第３のＬＥＤ光源３０１からの放射光および第４のＬＥＤ光源４０１からの放射光を合成するものである。 FIG. 3 is an explanatory diagram showing an outline of the configuration of another example of the optical system according to the light source device of the present invention.
This optical system has light having different peak wavelengths λ 1 [nm], λ 2 [nm], λ 3 [nm] and λ 4 [nm] (λ 1 > λ 2 > λ 3 > λ 4 ), respectively. The light emitted from the first LED light source 101, the light emitted from the second LED light source 201, the light emitted from the third LED light source 301 and the light emitted from the fourth LED light source 401. It is.

第１のＬＥＤ光源１０１は、第１のＬＥＤ素子１０と、光軸が第１のＬＥＤ素子１０の光出射面の中心軸に一致する状態で配置された、第１のＬＥＤ素子１０からの放射光を略平行光として照射する例えばパラボラミラー１０２とにより構成されている。また、第２のＬＥＤ光源２０１、第３のＬＥＤ光源３０１および第４のＬＥＤ光源４０１の各々も、第１のＬＥＤ光源１０１と同様の構成を有し、ＬＥＤ素子（２０，３０，４０）とパラボラミラー（２０２，３０２，４０２）とにより構成されている。   The first LED light source 101 is radiated from the first LED element 10 and the first LED element 10 arranged in a state where the optical axis coincides with the central axis of the light emitting surface of the first LED element 10. For example, it is configured by a parabolic mirror 102 that emits light as substantially parallel light. In addition, each of the second LED light source 201, the third LED light source 301, and the fourth LED light source 401 has the same configuration as the first LED light source 101, and the LED element (20, 30, 40). It is comprised by the parabolic mirror (202,302,402).

この光学系においては、円板状の第１のダイクロイックミラー５１、円板状の第２のダイクロイックミラー５６および円板状の第３のダイクロイックミラー５８が、例えば同一の平面（ダイクロイックミラー配置面）上に並んで、配置されており、第１のＬＥＤ光源１０１、第２のＬＥＤ光源２０１、第３のＬＥＤ光源３０１および第４のＬＥＤ光源４０１が、ダイクロイックミラー配置面の一面側における、ダイクロイックミラー配置面の面方向に離間して並んだ位置において、パラボラミラー１０２，２０２，３０２，４０２の光軸が例えば互いに平行に伸びるよう配置されている。また、ダイクロイックミラー配置面の他面側には、３つの反射ミラー７０，７１，７２が、それぞれ対応する３つのダイクロイックミラー５１，５６，５８の各々に対してダイクロイックミラー配置面の面方向に変位した位置において、反射面７０Ａ，７１Ａ，７２Ａがダイクロイックミラー配置面に対向するよう配置されている。   In this optical system, the disk-shaped first dichroic mirror 51, the disk-shaped second dichroic mirror 56, and the disk-shaped third dichroic mirror 58 are, for example, the same plane (dichroic mirror arrangement surface). The first LED light source 101, the second LED light source 201, the third LED light source 301, and the fourth LED light source 401 are arranged side by side on the one side of the dichroic mirror arrangement surface. The optical axes of the parabolic mirrors 102, 202, 302, and 402 are arranged so as to extend in parallel with each other, for example, at positions arranged side by side in the surface direction of the arrangement surface. In addition, on the other surface side of the dichroic mirror arrangement surface, the three reflection mirrors 70, 71, 72 are displaced in the surface direction of the dichroic mirror arrangement surface with respect to the corresponding three dichroic mirrors 51, 56, 58, respectively. At the positions, the reflecting surfaces 70A, 71A, 72A are arranged to face the dichroic mirror arrangement surface.

第１のダイクロイックミラー５１は、第１のＬＥＤ素子１０のピーク波長λ1 と第２のＬＥＤ素子２０のピーク波長λ2 との間の波長範囲内において反射−透過変換波長（境界波長）λ01（λ2 ＜λ01＜λ1 ）を有し、反射−透過変換波長λ01より長波長の光を反射し、反射−透過変換波長λ01より短波長の光を透過する波長選択特性を有する。
第２のダイクロイックミラー５６は、第２のＬＥＤ素子２０のピーク波長λ2 と第３のＬＥＤ素子３０のピーク波長λ3 との間の波長範囲内において反射−透過変換波長（境界波長）λ02（λ3 ＜λ02＜λ2 ）を有し、反射−透過変換波長λ02より長波長の光を反射し、反射−透過変換波長λ02より短波長の光を透過する波長選択特性を有する。
第３のダイクロイックミラー５８は、第３のＬＥＤ素子３０のピーク波長λ3 と第４のＬＥＤ素子４０のピーク波長λ4 との間の波長範囲内において反射−透過変換波長（境界波長）λ03（λ4 ＜λ03＜λ3 ）を有し、反射−透過変換波長λ03より長波長の光を反射し、反射−透過変換波長λ03より短波長の光を透過する波長選択特性を有する。 The first dichroic mirror 51 is reflected in the wavelength range between the peak wavelength lambda 1 and the peak wavelength lambda 2 of the second LED element 20 of the first LED element 10 - transparent translation Wavelength (boundary wavelength) lambda 01 (λ 2 <λ 01 <λ 1) has a reflection - from transparent translation wavelength lambda 01 reflects light of a long wavelength, the reflected - a wavelength selection characteristics for transmitting light having a shorter wavelength than the transmission conversion wavelength lambda 01 .
The second dichroic mirror 56, the reflection in the wavelength range between the peak wavelength lambda 2 and the peak wavelength lambda 3 of third LED elements 30 of the second LED element 20 - transparent translation Wavelength (boundary wavelength) lambda 02 (λ 3 <λ 02 <λ 2) has a reflection - from transparent translation wavelength lambda 02 reflects light of a long wavelength, the reflected - a wavelength selection characteristics for transmitting light having a shorter wavelength than the transmission conversion wavelength lambda 02 .
The third dichroic mirror 58 is reflected in the wavelength range between the peak wavelength lambda 3 of third LED elements 30 and the peak wavelength lambda 4 of the fourth LED elements 40 - transparent translation Wavelength (boundary wavelength) lambda 03 has a (λ 4 <λ 03 <λ 3), the reflection - from transparent translation wavelength lambda 03 reflects light of a long wavelength, the reflected - a wavelength selection characteristics for transmitting light having a shorter wavelength than the transmission conversion wavelength lambda 03 .

この光学系においては、第１のダイクロイックミラー５１の他面５１Ｂに所定の入射角で入射される、第１のＬＥＤ光源１０１からの放射光が反射ミラー７０によって反射された反射光が、第１のダイクロイックミラー５１の他面５１Ｂによって反射されると共に、第１のダイクロイックミラー５１の一面５１Ａに所定の大きさの入射角で入射される第２のＬＥＤ光源２０１からの放射光が第１のダイクロイックミラー５１を透過し、これにより、第１のＬＥＤ光源１０１からの放射光および第２のＬＥＤ光源２０１からの放射光が合成される。
そして、第２のダイクロイックミラー５６の他面５６Ｂに所定の大きさの入射角で入射される、第１のダイクロイックミラー５１による合成光が第２の反射ミラー７１により反射された反射光が、第２のダイクロイックミラー５６の他面５６Ｂによって反射されると共に、第２のダイクロイックミラー５６の一面５６Ａに所定の大きさの入射角で入射される、第３のＬＥＤ光源３０１からの放射光が第２のダイクロイックミラー５６を透過し、これにより、第１のＬＥＤ光源１０１からの放射光および第２のＬＥＤ光源２０１からの放射光の合成光と、第３のＬＥＤ光源３０１からの放射光が合成される。
さらに、第３のダイクロイックミラー５８の他面５８Ｂに所定の大きさの入射角で入射される、第２のダイクロイックミラー５６による合成光が第３の反射ミラー７２により反射された反射光が、第３のダイクロイックミラー５８の他面５８Ｂによって反射されると共に、第３のダイクロイックミラー５８の一面５８Ａに所定の大きさの入射角で入射される、第４のＬＥＤ光源４０１からの放射光が第３のダイクロイックミラー５８を透過し、これにより、第１のＬＥＤ光源１０１からの放射光、第２のＬＥＤ光源２０１からの放射光および第３のＬＥＤ光源３０１からの放射光の合成光と、第４のＬＥＤ光源４０１からの放射光が合成される。 In this optical system, the reflected light that is incident on the other surface 51B of the first dichroic mirror 51 at a predetermined incident angle and is reflected by the reflection mirror 70 from the first LED light source 101 is reflected by the first optical system. The radiant light from the second LED light source 201 that is reflected by the other surface 51B of the dichroic mirror 51 and incident on the one surface 51A of the first dichroic mirror 51 at an incident angle of a predetermined magnitude is the first dichroic mirror. Through the mirror 51, the emitted light from the first LED light source 101 and the emitted light from the second LED light source 201 are combined.
Then, the reflected light, which is incident on the other surface 56B of the second dichroic mirror 56 at an incident angle of a predetermined magnitude and is reflected by the second reflecting mirror 71, is reflected by the first reflecting mirror 71. The radiated light from the third LED light source 301 is reflected by the other surface 56B of the second dichroic mirror 56 and incident on the one surface 56A of the second dichroic mirror 56 at an incident angle of a predetermined magnitude. Thus, the combined light of the emitted light from the first LED light source 101 and the emitted light from the second LED light source 201 and the emitted light from the third LED light source 301 are combined. The
Further, the reflected light, which is incident on the other surface 58B of the third dichroic mirror 58 at an incident angle of a predetermined magnitude and is reflected by the third reflecting mirror 72, is reflected by the second reflecting mirror 72. The radiated light from the fourth LED light source 401 is reflected by the other surface 58B of the third dichroic mirror 58 and incident on the one surface 58A of the third dichroic mirror 58 at an incident angle of a predetermined magnitude. Of the first LED light source 101, the combined light of the second LED light source 201 and the third LED light source 301, and the fourth light. The emitted light from the LED light source 401 is synthesized.

このような構成の光学系を有する光源装置においても、図１に示す構成の光学系を有するものと同様の効果、すなわち、ダイクロイックミラーを透過する透過回数の合計が可及的に少なくなる状態で構成されていることにより、光の利用効率を一層高くすることができて十分に高い輝度を得ることができる。   In the light source device having the optical system having such a configuration, the same effect as that having the optical system having the configuration shown in FIG. 1, that is, in a state where the total number of times of transmission through the dichroic mirror is as small as possible. By being configured, the light utilization efficiency can be further increased, and sufficiently high luminance can be obtained.

１０ 第１のＬＥＤ素子
１０Ａ 光出射面
２０ 第２のＬＥＤ素子
２０Ａ 光出射面
３０ 第３のＬＥＤ素子
３０Ａ 光出射面
４０ 第４のＬＥＤ素子
Ｃ１ 基準軸（第１のＬＥＤ素子の光出射面の中心軸）
Ｃ２ 第２のＬＥＤ素子の光出射面の中心軸
Ｃ３ 第３のＬＥＤ素子の光出射面の中心軸
５１ 第１のダイクロイックミラー
５１Ａ 一面
５１Ｂ 他面
５６ 第２のダイクロイックミラー
５６Ａ 一面
５６Ｂ 他面
５８ 第３のダイクロイックミラー
５８Ａ 一面
５８Ｂ 他面
６１ 第１のコリメータレンズ
６２ 第２のコリメータレンズ
６３ 第３のコリメータレンズ
７０ 第１の反射ミラー
７１ 第２の反射ミラー
７２ 第３の反射ミラー
７０Ａ，７１Ａ，７２Ａ 反射面
８０ ＬＥＤ発光部
８１ 楕円面反射鏡
８２ 球面レンズ
８３ 円錐反射鏡
８４ 透光性ロッド
８５ コンデンサレンズ
８６ リレーレンズ
９０Ａ 第１のＬＥＤ光源
９０Ｂ 第２のＬＥＤ光源
９０Ｃ 第３のＬＥＤ光源
９１ 第１のダイクロイックミラー
９２ 第２のダイクロイックミラー
９３ コリメータレンズ
Ｓ 露光面
１０１ 第１のＬＥＤ光源
２０１ 第２のＬＥＤ光源
３０１ 第３のＬＥＤ光源
４０１ 第４のＬＥＤ光源
１０２，２０２，３０２，４０２ パラボラミラー DESCRIPTION OF SYMBOLS 10 1st LED element 10A Light-emission surface 20 2nd LED element 20A Light-emission surface 30 3rd LED element 30A Light-emission surface 40 4th LED element C1 Reference axis (light-emission surface of 1st LED element) Center axis)
C2 Center axis of light emitting surface of second LED element C3 Center axis of light emitting surface of third LED element 51 First dichroic mirror 51A One surface 51B Other surface 56 Second dichroic mirror 56A One surface 56B Other surface 58 First 3 dichroic mirror 58A one surface 58B other surface 61 first collimator lens 62 second collimator lens 63 third collimator lens 70 first reflection mirror 71 second reflection mirror 72 third reflection mirror 70A, 71A, 72A Reflective surface 80 LED light emitting portion 81 Ellipsoidal reflector 82 Spherical lens 83 Conical reflector 84 Translucent rod 85 Condenser lens 86 Relay lens 90A First LED light source 90B Second LED light source 90C Third LED light source 91 First Dichroic Mirror 92 Second Dichroic Mi Over 93 collimator lens S exposed surface 101 first LED light source 201 and the second LED light source 301 third LED light source 401 a fourth LED light sources 102, 202, 302, and 402 parabolic mirror

Claims (1)

ピーク波長が互いに異なる３つ以上のＬＥＤ光源と、
第１のＬＥＤ光源から放射された放射光と第２のＬＥＤ光源から放射された放射光とを合成する第１のダイクロイックミラーと、
当該第１のダイクロイックミラーにより合成された合成光と第３のＬＥＤ光源から放射される放射光とを合成する、前記第１のダイクロイックミラーと波長選択特性が異なる第２のダイクロイックミラーと
を有し、
前記第２のダイクロイックミラーは、前記第１のダイクロイックミラーにより得られる合成光を反射すると共に前記第３のＬＥＤ光源からの放射光を透過するものであることを特徴とする光源装置。 Three or more LED light sources having different peak wavelengths,
A first dichroic mirror that combines the emitted light emitted from the first LED light source and the emitted light emitted from the second LED light source;
A first dichroic mirror for synthesizing synthesized light synthesized by the first dichroic mirror and radiated light emitted from a third LED light source; and a second dichroic mirror having a wavelength selection characteristic different from that of the first dichroic mirror. ,
The second dichroic mirror reflects the combined light obtained by the first dichroic mirror and transmits the emitted light from the third LED light source.
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