JP2021089302A - Light source device and image projection device - Google Patents

Light source device and image projection device Download PDF

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JP2021089302A
JP2021089302A JP2019217691A JP2019217691A JP2021089302A JP 2021089302 A JP2021089302 A JP 2021089302A JP 2019217691 A JP2019217691 A JP 2019217691A JP 2019217691 A JP2019217691 A JP 2019217691A JP 2021089302 A JP2021089302 A JP 2021089302A
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light
light source
microstructure
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児玉　浩幸
Hiroyuki Kodama
浩幸 児玉
勇樹 前田
Yuuki Maeda
勇樹 前田
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Canon Inc
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Abstract

To improve light utilization efficiency in a light source device.SOLUTION: A light source device includes: a light source; an optical element that is irradiated with light from the light source; and a fine structure element 103 that is arranged between the light source and the optical element and has a fine structure surface 1032 acting on the light from the light source. The fine structure element 103 is arranged such that the fine structure surface 1032 is directed to the optical element.SELECTED DRAWING: Figure 2

Description

本発明は、画像投射装置（以下、プロジェクタという）に好適な光源装置に関する。 The present invention relates to a light source device suitable for an image projection device (hereinafter referred to as a projector).

プロジェクタには、その光源として半導体レーザ素子を用いるものがある。特許文献１〜３には、レーザ光がコヒーレント光であることを利用して、光源からの光路上に回折光学素子等の微細構造素子を配置したプロジェクタが開示されている。 Some projectors use a semiconductor laser element as the light source. Patent Documents 1 to 3 disclose a projector in which a microstructure element such as a diffractive optical element is arranged on an optical path from a light source by utilizing the fact that the laser light is coherent light.

特開２０１１−０５９２６５号公報Japanese Unexamined Patent Publication No. 2011-059265 特開２０１４−１７８５９９号公報Japanese Unexamined Patent Publication No. 2014-178599 特開２０１５−０８１９５３号公報Japanese Unexamined Patent Publication No. 2015-081953

微細構造素子は、その微細構造面の向きによって効率が変わる。しかしながら、特許文献１〜３には微細構造面の向きについては記載がない。 The efficiency of the microstructure element varies depending on the orientation of the microstructure surface. However, Patent Documents 1 to 3 do not describe the orientation of the microstructure surface.

本発明は、微細構造面の向きを適切に設定することで、より効率が高い光源装置およびこれを用いたプロジェクタを提供する。 The present invention provides a more efficient light source device and a projector using the light source device by appropriately setting the orientation of the microstructure surface.

本発明の一側面としての光源装置は、光源と、該光源からの光が照射される光学素子と、光源と光学素子との間に配置され、光源からの光に対して作用する微細構造面を有する微細構造素子とを含む。微細構造素子は、微細構造面が光学素子側を向くように配置されていることを特徴とする。なお、上記光源装置を用いた画像投射装置も、本発明の他の一側面を構成する。 The light source device as one aspect of the present invention is a microstructure surface that is arranged between a light source, an optical element irradiated with light from the light source, and the light source and the optical element, and acts on the light from the light source. Includes microstructured elements with. The microstructure element is characterized in that the microstructure surface is arranged so as to face the optical element side. An image projection device using the light source device also constitutes another aspect of the present invention.

本発明によれば、微細構造素子における微細構造面の向きを適切に設定したことで、より効率が高い光源装置を実現することができる。 According to the present invention, a more efficient light source device can be realized by appropriately setting the orientation of the microstructure surface in the microstructure element.

本発明の実施例１である光源装置を備えたプロジェクタの構成を示す図。The figure which shows the structure of the projector provided with the light source device which is Example 1 of this invention. 実施例１の光源装置に用いられる微細構造素子の概略図。The schematic diagram of the microstructure element used for the light source apparatus of Example 1. FIG. 微細構造素子の微細構造面の概略図。The schematic view of the microstructure surface of the microstructure element. 実施例１における微細構造素子上での光強度分布を示す図。The figure which shows the light intensity distribution on the microstructure element in Example 1. FIG. 実施例１における蛍光体上での光強度分布を示す図。The figure which shows the light intensity distribution on the phosphor in Example 1. FIG. 微細構造素子に入射して微細構造の側面に向かう光を示す図。The figure which shows the light which is incident on a microstructure element and goes to the side surface of a microstructure. 本発明の実施例２である光源装置の構成を示す図。The figure which shows the structure of the light source apparatus which is Example 2 of this invention. 本発明の実施例３である光源装置の構成を示す図。The figure which shows the structure of the light source apparatus which is Example 3 of this invention.

以下、本発明の実施例について図面を参照しながら説明する。 Hereinafter, examples of the present invention will be described with reference to the drawings.

図１は、本発明の実施例１である光源装置１００を備えたプロジェクタ（画像投射装置）の構成を示している。光源装置１００は、複数のレーザ光源１０１、複数のコリメータレンズ（コリメート素子）Ａ１０２、複数の微細構造素子１０３、波長変換素子（光学素子）としての複数の蛍光体１０４および複数のコリメータレンズＢ１０５により構成されている。なお、複数の微細構造素子１０３に代えて、１つの微細構造素子を設け、該１つの微細構造素子における複数の領域に複数のレーザ光源１０１からの光が入射するように構成してもよい。同様に、複数の蛍光体１０４に代えて、１つの蛍光体を設け、該１つの蛍光体における複数の領域に複数のレーザ光源１０１からの光が入射するように構成してもよい。 FIG. 1 shows the configuration of a projector (image projection device) including the light source device 100 according to the first embodiment of the present invention. The light source device 100 includes a plurality of laser light sources 101, a plurality of collimator lenses (collimator elements) A102, a plurality of microstructure elements 103, a plurality of phosphors 104 as wavelength conversion elements (optical elements), and a plurality of collimator lenses B105. Has been done. In addition, instead of the plurality of microstructure elements 103, one microstructure element may be provided so that light from a plurality of laser light sources 101 is incident on a plurality of regions of the one microstructure element. Similarly, one phosphor may be provided instead of the plurality of phosphors 104, and the light from the plurality of laser light sources 101 may be incident on the plurality of regions of the one phosphor.

複数のレーザ光源１０１はそれぞれ、青色のレーザ光（以下、単に光または青色光という）を発する。レーザ光源１０１から発せられた拡散光は、コリメータレンズＡ１０２により一点鎖線で示す光軸が延びる方向（以下、光軸方向という）に進む平行光に近づけられて微細構造素子１０３に入射する。微細構造素子１０３は、図２に示すように、基板１０３１における一方の面が微細構造面１０３２で、他方（反対側）の面が平面１０３３として形成された素子である。 Each of the plurality of laser light sources 101 emits blue laser light (hereinafter, simply referred to as light or blue light). The diffused light emitted from the laser light source 101 is brought close to the parallel light traveling in the direction in which the optical axis indicated by the one-point chain line extends (hereinafter referred to as the optical axis direction) by the collimator lens A102, and is incident on the microstructure element 103. As shown in FIG. 2, the microstructure element 103 is an element in which one surface of the substrate 1031 is a microstructure surface 1032 and the other (opposite side) surface is a flat surface 1033.

図３は、微細構造面１０３２の８位相分の構成を概略的に示している。微細構造面１０３２には、光軸方向に交差（図では光軸方向に直交）する端面１０３２ａおよび光軸方向に延びる（図では光軸方向に平行な）側面１０３２ｂをそれぞれ複数含む微細構造（複数の凸部と凹部）が形成されている。微細構造面１０３２には、高さ1,000nm内に８つの端面１０３２ａ（125nmずつの段差）が設けられている。そして本実施例では、微細構造素子１０３は、図２に示すように平面１０３３が入射面となるようにレーザ光源１０１側を向き、微細構造面１０３２が蛍光体１０４側（光学素子側）を向くように配置されている。 FIG. 3 schematically shows the configuration of eight phases of the microstructure surface 1032. The microstructure surface 1032 includes a plurality of end faces 1032a intersecting in the optical axis direction (orthogonal to the optical axis direction in the figure) and a plurality of side surfaces 1032b extending in the optical axis direction (parallel to the optical axis direction in the figure). Convex and concave) are formed. The microstructure surface 1032 is provided with eight end faces 1032a (steps of 125 nm each) within a height of 1,000 nm. Then, in this embodiment, as shown in FIG. 2, the microstructure element 103 faces the laser light source 101 side so that the plane 1033 becomes the incident surface, and the microstructure element 1032 faces the phosphor 104 side (optical element side). It is arranged like this.

なお、後述する実施例２のように微細構造素子１０３と蛍光体１０４との間に反射面が含まれていてもよい。この場合、該反射面での反射を含む屈曲光路を直線光路に展開したときに微細構造面１０３２が蛍光体１０４側を向いていればよく、言い換えれば微細構造素子１０３において微細構造面１０３２が出射側にあればよい。同様にレーザ光源１０１と微細構造素子１０３との間に反射面が含まれていてもよく、そこでの反射を含む屈曲光路を直線光路に展開したときに平面１０３３がレーザ光源１０１側を向いていればよく、言い換えれば微細構造素子１０３において平面１０３３が入射側にあればよい。 A reflective surface may be included between the microstructure element 103 and the phosphor 104 as in the second embodiment described later. In this case, it is sufficient that the microstructure surface 1032 faces the phosphor 104 side when the bent optical path including the reflection on the reflection surface is developed into the straight optical path, in other words, the microstructure surface 1032 is emitted from the microstructure element 103. It should be on the side. Similarly, a reflecting surface may be included between the laser light source 101 and the microstructure element 103, and the plane 1033 faces the laser light source 101 side when the bending optical path including the reflection there is developed into a straight optical path. In other words, in the microstructure element 103, the plane 1033 may be on the incident side.

微細構造素子１０３に平面１０３３から入射した光は、微細構造面１０３２で回折されて蛍光体１０４に照射され（入射し）、蛍光体１０４上に所定の光強度分布を形成する。すなわち、微細構造面１０３２は、入射する光に作用してその光の強度分布、言い換えれば光軸に直交する断面形状の縦横比を変換する。例えば、図４は、微細構造素子１０３に入射する光の平面１０３３上での光強度分布（断面形状）を示す。図５は、微細構造面１０３２の光学作用である回折作用によって蛍光体１０４上に形成された光強度分布を示す。 The light incident on the microstructure element 103 from the plane 1033 is diffracted by the microstructure surface 1032 and irradiated (incidents) on the phosphor 104 to form a predetermined light intensity distribution on the phosphor 104. That is, the microstructure surface 1032 acts on the incident light to change the intensity distribution of the light, in other words, the aspect ratio of the cross-sectional shape orthogonal to the optical axis. For example, FIG. 4 shows a light intensity distribution (cross-sectional shape) on a plane 1033 of light incident on the microstructure element 103. FIG. 5 shows the light intensity distribution formed on the phosphor 104 by the diffraction action which is the optical action of the microstructure surface 1032.

蛍光体１０４は、入射した青色光の一部を黄色光に波長変換し、残りを波長変換せずに出射させる。黄色光と波長変換されなかった青色光とが合成されることで白色光が生成される。蛍光体１０４から拡散光としての出射した白色光は、コリメータレンズＢ１０５で再び平行光に近づけられて光源装置１００から出射し、後段の照明光学系に入射する。 The phosphor 104 wavelength-converts a part of the incident blue light into yellow light and emits the rest without wavelength conversion. White light is generated by synthesizing yellow light and blue light that has not been wavelength-converted. The white light emitted from the phosphor 104 as diffused light is brought close to the parallel light again by the collimator lens B105, emitted from the light source device 100, and incident on the illumination optical system in the subsequent stage.

照明光学系は、２つのフライアイレンズにより構成される光分割光学系２００とコンデンサレンズ３００により構成されている。光分割光学系２００は、入射した光を複数の光に分割する。該複数の光はコンデンサレンズ３００によって光変調素子４００上にて互いに重ね合わせられるように集光される。これにより、光変調素子４００の変調面が均一な光強度で照明される。 The illumination optical system is composed of an optical division optical system 200 composed of two fly-eye lenses and a condenser lens 300. The optical division optical system 200 divides the incident light into a plurality of light. The plurality of lights are collected by the condenser lens 300 so as to be superposed on the light modulation element 400. As a result, the modulation surface of the light modulation element 400 is illuminated with a uniform light intensity.

光変調素子４００は、液晶パネルやデジタルマイクロミラーデバイス等により構成され、入射した光（照明光）をプロジェクタに外部から入力された映像信号に応じて変調する。光変調素子４００から出射した変調光（画像光）は、投射光学系５００によりスクリーン（被投射面）６００に拡大投射される。これによりスクリーン６００上に投射画像が表示される。 The light modulation element 400 is composed of a liquid crystal panel, a digital micromirror device, or the like, and modulates incident light (illumination light) according to a video signal input from the outside to the projector. The modulated light (image light) emitted from the light modulation element 400 is magnified and projected onto the screen (projected surface) 600 by the projection optical system 500. As a result, the projected image is displayed on the screen 600.

次に、微細構造素子１０３を微細構造面１０３２が蛍光体１０４側を向くように配置した理由を、図６を用いて説明する。 Next, the reason why the microstructure element 103 is arranged so that the microstructure surface 1032 faces the phosphor 104 side will be described with reference to FIG.

コリメータレンズＡ１０２を通過した光は、レーザ光源１０１の発光部が有限の大きさを有していることや各光学素子の配置誤差等もあるため完全な平行光とはならず、わずかに拡散または収束している。微細構造素子１０３は、図３に示す微細構造のピッチや段差（高さ）によって図４に示す光強度分布を図５に示す光強度分布に変換するように設計されるが、このとき側面１０３２ｂに当たる光は想定されていない。わずかに拡散または収束した光は、その拡散または収束の光軸に対する角度αに応じて図６の左側に示すように微細構造面１０３２の側面１０３２ｂに当たる。 The light that has passed through the collimator lens A102 is not completely parallel light due to the fact that the light emitting portion of the laser light source 101 has a finite size and the arrangement error of each optical element, and is slightly diffused or slightly diffused. It is converging. The microstructure element 103 is designed to convert the light intensity distribution shown in FIG. 4 into the light intensity distribution shown in FIG. 5 according to the pitch and step (height) of the microstructure shown in FIG. The light that hits is not expected. The slightly diffused or converged light hits the side surface 1032b of the microstructure surface 1032 as shown on the left side of FIG. 6 according to the angle α of the diffused or converged optical axis.

しかし、図６の右側に示すように微細構造面１０３２が出射側（蛍光体１０４側）であると、レーザ光源１０１側の入射面（平面）１０３３への入射による屈折によって光の光軸に対する角度βがαより小さくなる。この結果、光が側面１０３２ｂに当たる率（量）が下がり、図５に示す想定（理想）に近い光強度分布が蛍光体１０４上で得られる。これにより、後段の照明光学系において高い照明効率と均一な照度分布を実現することが容易となる。 However, as shown on the right side of FIG. 6, when the microstructure surface 1032 is on the exit side (phosphor body 104 side), the angle with respect to the optical axis due to refraction due to incidence on the incident surface (plane) 1033 on the laser light source 101 side β is smaller than α. As a result, the rate (amount) of light hitting the side surface 1032b decreases, and a light intensity distribution close to the assumption (ideal) shown in FIG. 5 can be obtained on the phosphor 104. This makes it easy to realize high lighting efficiency and a uniform illuminance distribution in the subsequent illumination optical system.

このように本実施例によれば、微細構造素子１０３における微細構造面１０３２の向きを適切に設定したことで、より効率が高い光源装置１００、さらにはプロジェクタを実現することができる。 As described above, according to the present embodiment, by appropriately setting the orientation of the microstructure surface 1032 in the microstructure element 103, a more efficient light source device 100 and further a projector can be realized.

図７は、本発明の実施例２である光源装置１１０を備えたプロジェクタのうち光源装置１１０、照明光学系および光変調素子４００を示している。光源装置１１０は、複数のレーザ光源１１１（１１１Ｒ，１１１Ｇ，１１１Ｂ）、複数のコリメータレンズＡ１１２（１１２Ｒ，１１２Ｇ，１１２Ｂ）、複数の微細構造素子１１３（１１３Ｒ，１１３Ｇ，１１３Ｂ）、複数の拡散板（光学素子としての拡散素子）１１４および複数のコリメータレンズＢ１１５により構成されている。符号に付されたＲ，ＧおよびＢはそれぞれ、赤色光、緑色光および青色光用の構成要素であることを示している。 FIG. 7 shows the light source device 110, the illumination optical system, and the light modulation element 400 among the projectors provided with the light source device 110 according to the second embodiment of the present invention. The light source device 110 includes a plurality of laser light sources 111 (111R, 111G, 111B), a plurality of collimator lenses A112 (112R, 112G, 112B), a plurality of microstructure elements 113 (113R, 113G, 113B), and a plurality of diffusers (11R, 113G, 113B). It is composed of a diffuser element) 114 as an optical element and a plurality of collimator lenses B115. The symbols R, G and B indicate that they are components for red light, green light and blue light, respectively.

なお、複数の微細構造素子１１３Ｒ，１１３Ｇ，１１３Ｂのそれぞれに代えて、微細構造素子を１つずつ設け、該１つずつの微細構造素子における複数の領域に複数のレーザ光源１１１Ｒ，１１１Ｇ，１１１Ｂからの光が入射するように構成してもよい。同様に、複数の拡散板１１４に代えて、１つの拡散板を設け、該１つの拡散板における複数の領域に後述する白色光が入射するように構成してもよい。 In addition, instead of each of the plurality of microstructure elements 113R, 113G, 113B, one microstructure element is provided, and from a plurality of laser light sources 111R, 111G, 111B in a plurality of regions of the one microstructure element. It may be configured so that the light of the above is incident. Similarly, one diffuser plate may be provided instead of the plurality of diffuser plates 114 so that the white light described later is incident on the plurality of regions of the one diffuser plate.

複数のレーザ光源１１１Ｒは赤色（Ｒ）光を発し、複数のレーザ光源１１１Ｇは緑色（Ｇ）光を発する。複数のレーザ光源１１１Ｂは青色（Ｂ）光を発する。各レーザ光源１１１からの拡散光は、コリメータレンズＡ１１２により一点鎖線で示す光軸が延びる方向（光軸方向）に進む平行光に近づけられて微細構造素子１１３に入射する。微細構造素子１１３は、実施例１と同様に構成されたものであり、その平面が入射面となるようにレーザ光源１１１側を向き、微細構造面が拡散板１１４側（光学素子側）を向くように配置されている。なお、ここにいう微細構造面が拡散板１１４側を向くとは、実施例１でも説明したように、ダイクロイックミラーＡ１１６，Ｂ１１７での反射を含む屈曲光路を直線光路に展開したときに微細構造面が拡散板１１４側を向いているという意味である。 The plurality of laser light sources 111R emit red (R) light, and the plurality of laser light sources 111G emit green (G) light. The plurality of laser light sources 111B emit blue (B) light. The diffused light from each laser light source 111 is brought close to the parallel light traveling in the direction in which the optical axis indicated by the one-point chain line extends (optical axis direction) by the collimator lens A112, and is incident on the microstructure element 113. The microstructure element 113 is configured in the same manner as in the first embodiment, and the plane thereof faces the laser light source 111 side so that the plane thereof becomes the incident surface, and the microstructure surface faces the diffuser plate 114 side (optical element side). It is arranged like this. It should be noted that the fact that the microstructure surface referred to here faces the diffuser plate 114 side means that the microstructure surface is developed into a straight optical path when the bent optical path including reflection by the dichroic mirrors A116 and B117 is developed as described in the first embodiment. Means that is facing the diffuser plate 114 side.

微細構造素子１１３にその平面から入射した光（図４に示すような光強度分布を有する光）は、微細構造面で回折されてダイクロイックミラーＡ１１６，Ｂ１１７を介して拡散板１１４に照射され（入射し）、拡散板１１４上に図５に示したような所定の光強度分布を形成する。言い換えれば、実施例１と同様に、微細構造面はその光学作用としての回折作用によって、入射した光の光軸に直交する断面形状の縦横比を変換する。 The light incident on the microstructure element 113 from its plane (light having a light intensity distribution as shown in FIG. 4) is diffracted on the microstructure surface and irradiated to the diffuser plate 114 via the dichroic mirrors A116 and B117 (incident). However, a predetermined light intensity distribution as shown in FIG. 5 is formed on the diffuser plate 114. In other words, as in the first embodiment, the microstructure surface transforms the aspect ratio of the cross-sectional shape orthogonal to the optical axis of the incident light by the diffraction action as its optical action.

ダイクロイックミラーＡ１１６はＧ光とＢ光を透過してＲ光を反射し、ダイクロイックミラーＢ１１７はＢ光を反射してＧ光とＲ光を透過させる。微細構造素子１１３Ｒから出射してダイクロイックミラーＡ１１６により反射されたＲ光、微細構造素子１１３Ｇから出射してダイクロイックミラーＡ１１６，Ｂ１１７を透過したＧ光および微細構造素子１１３Ｂから出射してダイクロイックミラーＢ１１７により反射されたＢ光は、互いに合成されて白色光を形成する。拡散板１１４に入射いて拡散光となった白色光は、コリメータレンズＢ１１５で再び光軸方向に進む平行光に近づけられて光源装置１１０から出射し、後段の照明光学系に入射する。 The dichroic mirror A116 transmits G light and B light and reflects R light, and the dichroic mirror B117 reflects B light and transmits G light and R light. R light emitted from the microstructure element 113R and reflected by the dichroic mirror A116, G light emitted from the microstructure element 113G and transmitted through the dichroic mirrors A116 and B117, and emitted from the microstructure element 113B and reflected by the dichroic mirror B117. The resulting B light is combined with each other to form white light. The white light incident on the diffuser plate 114 and becoming diffused light is brought close to the parallel light traveling in the optical axis direction again by the collimator lens B115, emitted from the light source device 110, and incident on the illumination optical system in the subsequent stage.

照明光学系は、実施例１と同様に２つのフライアイレンズにより構成される光分割光学系２００とコンデンサレンズ３００により構成され、入射した光を複数の光に分割してこれらを光変調素子４００上で重ね合わせるように集光する。 The illumination optical system is composed of an optical division optical system 200 composed of two fly-eye lenses and a condenser lens 300 as in the first embodiment, and divides the incident light into a plurality of lights and divides these into a plurality of lights and divides them into an optical modulation element 400. Condensate so that they overlap on top.

本実施例でも、微細構造素子１１３を微細構造面が出射側（拡散板１１４側）に向くように配置したことで、微細構造素子１１３に入射した光が微細構造の側面に当たる率（量）が下がり、図５に示すような想定（理想）に近い光強度分布が拡散板１１４上で得られる。これにより、後段の照明光学系において高い照明効率と均一な照度分布を実現することが容易となる。 Also in this embodiment, by arranging the microstructure element 113 so that the microstructure surface faces the exit side (diffusion plate 114 side), the rate (amount) of the light incident on the microstructure element 113 hitting the side surface of the microstructure is increased. A light intensity distribution close to the assumption (ideal) as shown in FIG. 5 is obtained on the diffuser plate 114. This makes it easy to realize high lighting efficiency and a uniform illuminance distribution in the subsequent illumination optical system.

本実施例によれば、微細構造素子１１３における微細構造面の向きを適切に設定したことで、より効率が高い光源装置１１０、さらにはプロジェクタを実現することができる。 According to this embodiment, by appropriately setting the orientation of the microstructure surface of the microstructure element 113, a more efficient light source device 110 and further a projector can be realized.

図８は、実施例１で説明した光源装置１００を備えたプロジェクタのうち光源装置１００、照明光学系および光変調素子４００を示している。本実施例のプロジェクタは、照明光学系が光分割光学系２００を有さない点で実施例１と異なる。本実施例では、実施例１と同様に、蛍光体１０４上に図５に示すような光強度分布が形成され、その光強度分布をコリメータレンズＢ１０５とコンデンサレンズ３００によって光変調素子４００上に投影する。 FIG. 8 shows the light source device 100, the illumination optical system, and the light modulation element 400 among the projectors provided with the light source device 100 described in the first embodiment. The projector of this embodiment is different from that of the first embodiment in that the illumination optical system does not have the optical division optical system 200. In this embodiment, similarly to the first embodiment, a light intensity distribution as shown in FIG. 5 is formed on the phosphor 104, and the light intensity distribution is projected onto the light modulation element 400 by the collimator lens B105 and the condenser lens 300. To do.

このように光分割光学系２００を有さないプロジェクタにも、微細構造素子１０３の微細構造面を蛍光体１０４側に向けた実施例１の光源装置１００を用いることができる。 As described above, the light source device 100 of the first embodiment can be used for the projector which does not have the optical division optical system 200, in which the microstructure surface of the microstructure element 103 is directed to the phosphor 104 side.

なお、上記各実施例ではプロジェクタに用いられる光源装置について説明したが、各実施例の光源装置をプロジェクタ以外の装置に用いてもよい。 Although the light source device used for the projector has been described in each of the above embodiments, the light source device of each embodiment may be used for a device other than the projector.

以上説明した各実施例は代表的な例にすぎず、本発明の実施に際しては、各実施例に対して種々の変形や変更が可能である。 Each of the above-described examples is only a representative example, and various modifications and changes can be made to each of the examples in carrying out the present invention.

１０１，１１１ レーザ光源
１０３，１１３ 微細構造素子
１０４ 蛍光体
１１４ 拡散板
101,111 Laser light source 103,113 Microstructure element 104 Fluorescent material 114 Diffusing plate

Claims (9)

光源と、
該光源からの光が照射される光学素子と、
前記光源と前記光学素子との間に配置され、前記光源からの光に対して作用する微細構造面を有する微細構造素子とを含み、
前記微細構造素子は、前記微細構造面が前記光学素子側を向くように配置されていることを特徴とする光源装置。 Light source and
An optical element irradiated with light from the light source and
Includes a microstructure element that is disposed between the light source and the optical element and has a microstructure surface that acts on the light from the light source.
The microstructure element is a light source device characterized in that the microstructure surface is arranged so as to face the optical element side. 前記光源と前記微細構造素子との間に、前記光源からの拡散光を平行光に変換するコリメート素子を有することを特徴とする請求項１に記載の光源装置。 The light source device according to claim 1, further comprising a collimating element that converts diffused light from the light source into parallel light between the light source and the microstructure element. 前記微細構造面は、入射した光を回折させる作用を有することを特徴とする請求項１または２に記載の光源装置。 The light source device according to claim 1 or 2, wherein the microstructure surface has an action of diffracting incident light. 前記微細構造面は、入射した光の断面形状を変換する作用を有することを特徴とする請求項１から３のいずれか一項に記載の光源装置。 The light source device according to any one of claims 1 to 3, wherein the microstructure surface has an action of changing a cross-sectional shape of incident light. 前記微細構造素子における前記微細構造面とは異なる入射面が平面であることを特徴とする請求項１から４のいずれか一項に記載の光源装置。 The light source device according to any one of claims 1 to 4, wherein the incident surface of the microstructure element different from the microstructure surface is a flat surface. 前記光学素子は、入射した光を該入射した光の波長と異なる波長の光に変換する波長変換素子であることを特徴とする請求項１から５のいずれか一項に記載の光源装置。 The light source device according to any one of claims 1 to 5, wherein the optical element is a wavelength conversion element that converts incident light into light having a wavelength different from the wavelength of the incident light. 前記光学素子は、入射した光を拡散させる拡散素子であることを特徴とする請求項１から５のいずれか一項に記載の光源装置。 The light source device according to any one of claims 1 to 5, wherein the optical element is a diffusion element that diffuses incident light. 前記光源を複数有し、
該複数の光源に対して、少なくとも１つの微細構造素子が設けられていることを特徴とする請求項１から７のいずれか一項に記載の光源装置。 Having a plurality of the light sources
The light source device according to any one of claims 1 to 7, wherein at least one microstructure element is provided for the plurality of light sources. 請求項１から８のいずれか一項に記載の光源装置と、
該光源装置から出射した光を変調する光変調素子とを有し、
前記光変調素子からの光を投射して画像を表示することを特徴とする画像投射装置。 The light source device according to any one of claims 1 to 8.
It has a light modulation element that modulates the light emitted from the light source device.
An image projection device characterized by projecting light from the light modulation element to display an image.
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