JP2010097003A

JP2010097003A - Lighting optical system for two plate type projector

Info

Publication number: JP2010097003A
Application number: JP2008268133A
Authority: JP
Inventors: Kazuji Hyakumura; 和司百村
Original assignee: Olympus Corp
Current assignee: Olympus Corp
Priority date: 2008-10-17
Filing date: 2008-10-17
Publication date: 2010-04-30

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightening optical system for a two plate type projector which can stably obtain lightening having a desired wavelength band, and can obtain stable color reproducibility over a long period without using a rotary color filter. <P>SOLUTION: The light path of the lightening of rectilinear polarized light from a light source part 10 is alternately changed into the first light path 21 and into the second light path 22 by a light path changing part 20. In the first light path 21, the light of the first wavelength region is selected by the first wavelength region selection element 33, and, in the second light path 22, the light of the second wavelength region is selected by the second wavelength region selection element 37, and the light is introduced into a two plate type spatial light modulation part 50. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、２板式投影装置用照明光学系に関するものである。 The present invention relates to an illumination optical system for a two-plate projector.

従来、２板式投影装置として、例えば図１１に概略斜視図で示す構成のものが知られている（例えば、特許文献１参照）。この２板式投影装置においては、リフレクタ１０１を有する白色光源１０２を用い、この白色光源１０２から発した光を、白色光源１０２の近傍に配置した回転式のカラーフィルタ１０３に入射させている。カラーフィルタ１０３は、図１２に平面図を示すように、黄色およびマゼンダに２分割されたフィルタ部分１０３Ｙ，１０３Ｍを有しており、黄色のフィルタ部分１０３Ｙを透過した光から、光の３原色のうち、赤色（Ｒ）と緑色（Ｇ）との２色を合成した光を抽出し、マゼンダのフィルタ部分１０３Ｍを透過した光から、光の３原色のうち、赤色と青色（Ｂ）との２色を合成した光を抽出するようにしている。 2. Description of the Related Art Conventionally, as a two-plate projector, for example, a configuration shown in a schematic perspective view in FIG. 11 is known (see, for example, Patent Document 1). In this two-plate projection apparatus, a white light source 102 having a reflector 101 is used, and light emitted from the white light source 102 is incident on a rotary color filter 103 disposed in the vicinity of the white light source 102. As shown in the plan view of FIG. 12, the color filter 103 has filter portions 103Y and 103M which are divided into yellow and magenta, and the three primary colors of light are transmitted from the light transmitted through the yellow filter portion 103Y. Among them, light obtained by combining two colors of red (R) and green (G) is extracted, and two of red and blue (B) among the three primary colors of light are extracted from the light transmitted through the magenta filter portion 103M. Light that combines colors is extracted.

カラーフィルタ１０３を透過した光は、図１３に部分詳細平面図をも示すように、第１の偏光素子１０４によりＳ偏光に変換して第１の積層波長板１０５に入射させ、該第１の積層波長板１０５により特定の波長帯域、例えばＲ光のみ偏光方向を９０度回転させてＰ偏光に変換して偏光分離手段１０６に入射させている。 The light transmitted through the color filter 103 is converted to S-polarized light by the first polarizing element 104 and is incident on the first laminated wave plate 105 as shown in the partial detailed plan view of FIG. The laminated wave plate 105 rotates the polarization direction of only a specific wavelength band, for example, R light by 90 degrees to convert it into P-polarized light and makes it incident on the polarization separating means 106.

偏光分離手段１０６は、第１の積層波長板１０５を経て入射する光のうち、Ｐ偏光のＲ光は透過させ、それ以外のＳ偏光のＧ光またはＢ光は反射させて、それぞれに対応した反射型液晶パネル１０７，１０８に入射させている。これにより、液晶パネル１０７において、偏光分離手段１０６を透過したＲ光を変調して、Ｓ偏光として反射させ、液晶パネル１０８において、カラーフィルタ１０３の回転に同期して、１回転中にＧ光およびＢ光を順次変調して、Ｐ偏光として反射させている。 The polarized light separating means 106 transmits the P-polarized R light among the light incident through the first laminated wave plate 105 and reflects the other S-polarized G light or B light. The light is incident on the reflective liquid crystal panels 107 and 108. As a result, the R light transmitted through the polarization separating means 106 is modulated and reflected as S-polarized light in the liquid crystal panel 107, and the G light and the G light are rotated in one rotation in synchronization with the rotation of the color filter 103 in the liquid crystal panel 108. B light is sequentially modulated and reflected as P-polarized light.

反射型液晶パネル１０７，１０８で変調されて反射された各光は、再び偏光分離手段１０６に入射させて、該偏光分離手段１０６で合成し、その合成光を第２の積層波長板１０９に入射させて、Ｒ光の偏光方向のみ９０度回転させている。これにより、合成された光（投影光）を、全てＰ偏光として、第２の偏光素子１１０に入射させている。 Each light modulated and reflected by the reflective liquid crystal panels 107 and 108 is again incident on the polarization separation means 106 and synthesized by the polarization separation means 106, and the synthesized light is incident on the second laminated wave plate 109. Thus, only the polarization direction of the R light is rotated by 90 degrees. Thereby, all the synthesized light (projection light) is incident on the second polarizing element 110 as P-polarized light.

第２の偏光素子１１０は、Ｐ偏光のみを透過するもので、この第２の偏光素子１１０を透過したＰ偏光の投影光を、投影レンズ１１１を経てスクリーン１１２に結像させるようにしている。なお、特定の波長帯域だけの偏光方向を回転させる第１の積層波長板１０５および第２の積層波長板１０９は、位相差板を積層することによって構成されている波長選択性偏光素子であるカラーリンク社のカラーセレクト（登録商標）を用いることができる。 The second polarizing element 110 transmits only the P-polarized light, and the P-polarized projection light transmitted through the second polarizing element 110 is imaged on the screen 112 via the projection lens 111. Note that the first laminated wave plate 105 and the second laminated wave plate 109 that rotate the polarization direction of only a specific wavelength band are color-selective polarizing elements that are configured by laminating retardation plates. Link Color Select (registered trademark) can be used.

図１１に示した２板式投影装置では、スクリーン１１２へ投影するＲ，Ｇ，Ｂの投影光の偏光方向をＰ偏光に揃えるようにしている。したがって、スクリーン１１２として、偏光スクリーンを用いることにより、投影光の位相と異なる外光などの光の影響を受けにくくできるので、壁面や通常のスクリーンに投影する場合と比較して、投影画像のコントラストを向上することが可能となる。 In the two-plate projection apparatus shown in FIG. 11, the polarization directions of the R, G, and B projection light projected onto the screen 112 are aligned with the P-polarized light. Therefore, the use of a polarizing screen as the screen 112 makes it less susceptible to the influence of light such as external light that differs from the phase of the projected light, so that the contrast of the projected image is higher than when projected onto a wall surface or a normal screen. Can be improved.

特許３６１８６１１号公報Japanese Patent No. 3618611

しかしながら、図１１に示した従来の２板式投影装置においては、白色光源１０２の近傍に、図１２に示したような回転式のカラーフィルタ１０３を配置して、ＲおよびＧの２色を合成した光と、ＲおよびＢの２色を合成した光とを順次に抽出するようにしている。 However, in the conventional two-plate projection apparatus shown in FIG. 11, a rotary color filter 103 as shown in FIG. 12 is arranged in the vicinity of the white light source 102 to combine the two colors R and G. Light and light obtained by combining the two colors R and B are sequentially extracted.

このため、カラーフィルタ１０３が白色光源１０２により加熱されて、温度による特性変化や劣化が生じ易くなる。その結果、Ｒ，Ｇ，Ｂの各色光の透過帯域が変化して、所望の波長帯域を有する照明光を得ることができなくなり、投影画像の色再現性が低下することが懸念される。また、カラーフィルタ１０３に入射する照明光の光束径が大きいと、投影光の色純度が低下することも懸念される。すなわち、図１２に示したカラーフィルタ１０３において、白色光源１０２からの照明光が、黄色のフィルタ部分１０３Ｙと、マゼンタのフィルタ部分１０３Ｍとの境界を横切る期間は、両方のフィルタ部分１０３Ｙ，１０３Ｍを透過した色光が混在した状態となる。このため、照明光の光束径が大きいと、この混在期間が長くなって、投影光の色純度が低下することになる。なお、投影光の色純度を高めるために、カラーフィルタ１０３を、照明光の集光点やその近傍に配置することが考えられる。しかし、この場合は、白色光源１０２の近傍に配置した場合と同様に、温度による特性変化や劣化が生じ易くなるため、投影画像の色再現性が低下することになる。 For this reason, the color filter 103 is heated by the white light source 102, and characteristic changes and deterioration due to temperature are likely to occur. As a result, the transmission band of each color light of R, G, and B changes, and it becomes impossible to obtain illumination light having a desired wavelength band, and there is a concern that the color reproducibility of the projected image is deteriorated. Further, when the light beam diameter of the illumination light incident on the color filter 103 is large, there is a concern that the color purity of the projection light is lowered. That is, in the color filter 103 shown in FIG. 12, the illumination light from the white light source 102 is transmitted through both the filter portions 103Y and 103M during a period of crossing the boundary between the yellow filter portion 103Y and the magenta filter portion 103M. The colored light is mixed. For this reason, if the luminous flux diameter of the illumination light is large, this mixture period becomes long, and the color purity of the projection light is lowered. In order to increase the color purity of the projection light, it is conceivable to arrange the color filter 103 at or near the condensing point of the illumination light. However, in this case, as in the case where it is arranged near the white light source 102, the characteristic change or deterioration due to temperature is likely to occur, so that the color reproducibility of the projected image is lowered.

したがって、上記の事情に鑑みてなされた本発明の目的は、回転式のカラーフィルタを用いることなく、所望の波長帯域を有する照明光を安定して得ることができ、長期間に亘って安定した色再現性が得られる２板式投影装置用照明光学系を提供することにある。 Therefore, the object of the present invention made in view of the above circumstances is to stably obtain illumination light having a desired wavelength band without using a rotary color filter, and to be stable over a long period of time. An object of the present invention is to provide an illumination optical system for a two-plate projector that can achieve color reproducibility.

上記目的を達成する請求項１に係る２板式投影装置用照明光学系の発明は、
白色光の照明光を出射する光源部と、
該光源部と２板式の空間変調部との間の照明光の光路を第１光路または第２光路に選択的に切り替える光路切り替え部と、
前記第１光路に配置され、前記照明光から第１波長領域の光を選択する第１波長領域選択素子を有する第１光路光学系と、
前記第２光路に配置され、前記照明光から第２波長領域の光を選択する第２波長領域選択素子を有する第２光路光学系と、
を有する、ことを特徴とするものである。 The invention of an illumination optical system for a two-plate projection device according to claim 1 that achieves the above object is as follows:
A light source unit that emits white illumination light;
An optical path switching unit that selectively switches the optical path of the illumination light between the light source unit and the two-plate spatial modulation unit to the first optical path or the second optical path;
A first optical path optical system having a first wavelength region selection element that is disposed in the first optical path and selects light in the first wavelength region from the illumination light;
A second optical path optical system that is disposed in the second optical path and has a second wavelength region selection element that selects light in the second wavelength region from the illumination light;
It is characterized by having.

請求項２に係る発明は、請求項１に記載の２板式投影装置用照明光学系において、
前記光路切り替え部は、回転方向にそれぞれ複数の光透過領域および光反射領域を形成した回転円板を有し、該回転円板に対する前記光源部からの照明光の入射位置および前記回転円板から前記２板式の空間光変調部への照明光の出射位置を、一方が一の前記光透過領域に位置するとき、他方は一の前記光反射領域に位置するように異なる位置に設定するとともに、前記入射位置への照明光の入射光路および前記出射位置からの照明光の出射光路に対して、前記回転円板を傾斜して配置し、
前記第１光路および前記第２光路は、前記入射位置と前記出射位置との間で、前記回転円板の一方の面側および他方の面側にそれぞれ形成して、
前記回転円板の前記光透過領域が前記入射位置に位置するときは、該光透過領域を透過した照明光を、前記第１光路を経て前記出射位置に位置する前記回転円板の前記光反射領域で反射させて前記出射光路に導き、
前記回転円板の前記光反射領域が前記入射位置に位置するときは、該光反射領域で反射される照明光を、前記第２光路を経て前記出射位置に位置する前記回転円板の前記光透過領域を透過させて前記出射光路に導くように構成した、ことを特徴とするものである。 The invention according to claim 2 is the illumination optical system for a two-plate projector according to claim 1,
The optical path switching unit includes a rotating disk in which a plurality of light transmission regions and light reflecting regions are formed in the rotation direction, respectively, and the incident position of the illumination light from the light source unit with respect to the rotating disk and the rotation disk The position where the illumination light is emitted to the two-plate spatial light modulator is set to a different position so that when one is located in one light transmission region, the other is located in one light reflection region, With respect to the incident optical path of the illumination light to the incident position and the exit optical path of the illumination light from the exit position, the rotating disk is disposed to be inclined,
The first optical path and the second optical path are formed on one surface side and the other surface side of the rotating disk between the incident position and the emission position, respectively.
When the light transmission region of the rotating disk is positioned at the incident position, the illumination light transmitted through the light transmitting region is reflected by the light of the rotating disk positioned at the emission position via the first optical path. Reflected in the region and led to the outgoing optical path,
When the light reflecting area of the rotating disk is located at the incident position, the illumination light reflected by the light reflecting area is transmitted through the second optical path and the light of the rotating disk located at the emitting position. It is configured to transmit the transmission region and guide it to the outgoing optical path.

請求項３に係る発明は、請求項１に記載の２板式投影装置用照明光学系において、
前記光路切り替え部は、回転方向にそれぞれ複数の光透過領域および光反射領域を形成した回転円板を有し、該回転円板に対する前記光源部からの照明光の入射位置および前記回転円板から前記２板式の空間光変調部への照明光の出射位置を、一方が一の前記光透過領域に位置するとき、他方は他の前記光透過領域に位置し、一方が一の前記光反射領域に位置するとき、他方は他の前記光反射領域に位置するように異なる位置に設定するとともに、前記入射位置への照明光の入射光路および前記出射位置からの照明光の出射光路に対して、前記回転円板を傾斜して配置し、
前記第１光路および前記第２光路は、前記入射位置と前記出射位置との間で、前記回転円板の一方の面側および他方の面側にそれぞれ形成して、
前記回転円板の一の前記光透過領域が前記入射位置に位置するときは、該光透過領域を透過した照明光を、前記第１光路を経て前記出射位置に位置する前記回転円板の他の前記光透過領域を透過させて前記出射光路に導き、
前記回転円板の一の前記光反射領域が前記入射位置に位置するときは、該光反射領域で反射される照明光を、前記第２光路を経て前記出射位置に位置する前記回転円板の他の前記光反射領域で反射させて前記出射光路に導くように構成した、ことを特徴とするものである。 The invention according to claim 3 is the illumination optical system for a two-plate projector according to claim 1,
The optical path switching unit includes a rotating disk in which a plurality of light transmission regions and light reflecting regions are formed in the rotation direction, respectively, and the incident position of the illumination light from the light source unit with respect to the rotating disk and the rotation disk When one of the illumination light emission positions to the two-plate spatial light modulator is located in the one light transmission region, the other is located in the other light transmission region, and the other is the one light reflection region. And the other is set to a different position so as to be located in the other light reflection region, and the incident light path of the illumination light to the incident position and the emission light path of the illumination light from the emission position , The rotating disk is disposed at an inclination,
The first optical path and the second optical path are formed on one surface side and the other surface side of the rotating disk between the incident position and the emission position, respectively.
When the light transmission region of one of the rotating disks is positioned at the incident position, the illumination light transmitted through the light transmitting region is transmitted to the rotating disk positioned at the emission position via the first optical path. Through the light transmission region and led to the outgoing light path,
When the light reflecting area of one of the rotating disks is located at the incident position, the illumination light reflected by the light reflecting area is transmitted to the rotating disk located at the emitting position via the second optical path. It is configured such that it is reflected by the other light reflecting region and guided to the outgoing light path.

請求項４に係る発明は、請求項２または３に記載の２板式投影装置用照明光学系において、
前記光源部は、出射する照明光を集光する集光レンズを有する、ことを特徴とするものである。 The invention according to claim 4 is the illumination optical system for a two-plate projector according to claim 2 or 3,
The light source unit has a condensing lens that condenses emitted illumination light.

請求項５に係る発明は、請求項４に記載の２板式投影装置用照明光学系において、
前記第１光路光学系は、前記入射位置から入射する照明光を反射させて平行光とする第１放物面ミラーと、該第１放物面ミラーを経た照明光を反射させて収束光として前記出射位置に導く第２放物面ミラーとを有し、前記第１放物面ミラーと前記第２放物面ミラーとの間の平行光の光路中に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、前記入射位置から入射する照明光を反射させて平行光とする第３放物面ミラーと、該第３放物面ミラーを経た照明光を反射させて収束光として前記出射位置に導く第４放物面ミラーとを有し、前記第３放物面ミラーと前記第４放物面ミラーとの間の平行光の光路中に前記第２波長領域選択素子を配置した、ことを特徴とするものである。 The invention according to claim 5 is the illumination optical system for a two-plate projector according to claim 4,
The first optical path optical system reflects the illumination light incident from the incident position to make parallel light, and reflects the illumination light that has passed through the first parabolic mirror as converged light. A second parabolic mirror that leads to the emission position, and the first wavelength region selection element is disposed in an optical path of parallel light between the first parabolic mirror and the second parabolic mirror. And
The second optical path optical system reflects the illumination light incident from the incident position to make parallel light, and reflects the illumination light that has passed through the third parabolic mirror as converged light. A fourth parabolic mirror that leads to the emission position, and the second wavelength region selection element is disposed in an optical path of parallel light between the third parabolic mirror and the fourth parabolic mirror. It is characterized by that.

請求項６に係る発明は、請求項４に記載の２板式投影装置用照明光学系において、
前記第１光路光学系は、前記入射位置から入射する照明光を平行光に変換する第１レンズと、該第１レンズを経た照明光を反射させる第１ミラーと、該第１ミラーを経た照明光を収束光として前記出射位置に導く第２レンズとを有し、前記第１レンズと前記第２レンズとの間の平行光の光路中に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、前記入射位置から入射する照明光を平行光に変換する第３レンズと、該第３レンズを経た照明光を反射させる第２ミラーと、該第２ミラーを経た照明光を収束光として前記出射位置に導く第４レンズとを有し、前記第３レンズと前記第４レンズとの間の平行光の光路中に前記第２波長領域選択素子を配置した、ことを特徴とするものである。 The invention according to claim 6 is the illumination optical system for a two-plate projector according to claim 4,
The first optical path optical system includes a first lens that converts illumination light incident from the incident position into parallel light, a first mirror that reflects illumination light that has passed through the first lens, and illumination that has passed through the first mirror. A second lens for guiding light to the emission position as convergent light, and arranging the first wavelength region selection element in an optical path of parallel light between the first lens and the second lens,
The second optical path optical system includes a third lens that converts illumination light incident from the incident position into parallel light, a second mirror that reflects illumination light that has passed through the third lens, and illumination that has passed through the second mirror. A fourth lens that guides light to the emission position as convergent light, and the second wavelength region selection element is disposed in the optical path of parallel light between the third lens and the fourth lens. It is a feature.

請求項７に係る発明は、請求項４に記載の２板式投影装置用照明光学系において、
前記第１光路光学系は、前記入射位置から入射する照明光を反射させて収束光として前記出射位置に導く第１楕円ミラーを有し、該第１楕円ミラーの入射側または出射側に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、前記入射位置から入射する照明光を反射させて収束光として前記出射位置に導く第２楕円ミラーを有し、該第２楕円ミラーの入射側または出射側に前記第２波長領域選択素子を配置した、ことを特徴とするものである。 The invention according to claim 7 is the illumination optical system for a two-plate projector according to claim 4,
The first optical path optical system includes a first elliptical mirror that reflects illumination light incident from the incident position and guides the illumination light as convergent light to the emission position, and the first optical path optical system includes the first elliptical mirror on the incident side or the emission side of the first elliptical mirror. One wavelength region selection element is arranged,
The second optical path optical system includes a second elliptical mirror that reflects illumination light incident from the incident position and guides the illumination light as convergent light to the emission position, and the second optical path optical system includes the second elliptical mirror on the incident side or the emission side of the second elliptical mirror. A two-wavelength region selection element is arranged.

請求項８に係る発明は、請求項４に記載の２板式投影装置用照明光学系において、
前記第１光路光学系は、第１共通レンズおよび第３ミラーを有し、前記入射位置から入射する照明光を、前記第１共通レンズで平行光に変換した後、前記第３ミラーで反射させて前記第１共通レンズにより収束光として前記出射位置に導き、前記第３ミラーに対する入射側または出射側で、該第３ミラーと前記第１共通レンズとの間の平行光の光路中に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、第２共通レンズおよび第４ミラーを有し、前記入射位置から入射する照明光を、前記第２共通レンズで平行光に変換した後、前記第４ミラーで反射させて前記第２共通レンズにより収束光として前記出射位置に導き、前記第４ミラーに対する入射側または出射側で、該第４ミラーと前記第２共通レンズとの間の平行光の光路中に前記第２波長領域選択素子を配置した、ことを特徴とするものである。 The invention according to claim 8 is the illumination optical system for a two-plate projector according to claim 4,
The first optical path optical system includes a first common lens and a third mirror. The illumination light incident from the incident position is converted into parallel light by the first common lens, and then reflected by the third mirror. The first common lens guides the converged light to the exit position, and enters the parallel light path between the third mirror and the first common lens on the incident side or the exit side with respect to the third mirror. One wavelength region selection element is arranged,
The second optical path optical system includes a second common lens and a fourth mirror. The illumination light incident from the incident position is converted into parallel light by the second common lens and then reflected by the fourth mirror. Then, the second common lens guides the converged light to the exit position, and enters the parallel light path between the fourth mirror and the second common lens on the incident side or the exit side with respect to the fourth mirror. A two-wavelength region selection element is arranged.

請求項９に係る発明は、請求項４乃至８のいずれか一項に記載の２板式投影装置用照明光学系において、
前記光源部からの照明光を、前記入射位置で集光させるように構成した、ことを特徴とするものである。 The invention according to claim 9 is the illumination optical system for a two-plate projector according to any one of claims 4 to 8,
The illumination light from the light source unit is configured to be condensed at the incident position.

請求項１０に係る発明は、請求項５乃至８のいずれか一項に記載の２板式投影装置用照明光学系において、
前記光源部からの照明光を、前記入射位置および前記出射位置でそれぞれ集光させるように構成した、ことを特徴とするものである。 The invention according to claim 10 is the illumination optical system for a two-plate projector according to any one of claims 5 to 8,
The illumination light from the light source unit is configured to be condensed at the incident position and the emission position, respectively.

本発明によれば、回転式のカラーフィルタを用いることなく、光源部からの照明光の光路を、光路切り替え部により、第１光路と第２光路とに交互に切り替えて、第１光路では第１波長領域選択素子により第１波長領域の光を選択し、第２光路では第２波長領域選択素子により第２波長領域の光を選択するようにしたので、所望の波長帯域を有する照明光を安定して得ることができ、長期間に亘って安定した色再現性を得ることができる。 According to the present invention, the optical path of the illumination light from the light source unit is switched alternately between the first optical path and the second optical path by the optical path switching unit without using a rotary color filter, and the first optical path is the first optical path. Since light of the first wavelength region is selected by the one wavelength region selection element and light of the second wavelength region is selected by the second wavelength region selection element in the second optical path, illumination light having a desired wavelength band is selected. It can be obtained stably, and stable color reproducibility can be obtained over a long period of time.

以下、本発明の実施の形態について、図を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（第１実施の形態）
図１は、本発明の第１実施の形態に係る照明光学系を用いる２板式投影装置の概略構成を示す図である。本実施の形態では、光源部１０から白色光の照明光を集光して出射させる。光源部１０は、リフレクタ１１および超高圧水銀ランプ１２を有する光源１３と、ロッドインテグレータ１５と、集光レンズ１６とを有し、光源１３から発生した無偏光の白色光の照明光を、ロッドインテグレータ１５を経て均一な明るさの直線偏光に変換した後、集光レンズ１６により集光して出射させるように構成する。 (First embodiment)
FIG. 1 is a diagram showing a schematic configuration of a two-plate projector using the illumination optical system according to the first embodiment of the present invention. In the present embodiment, white light illumination light is condensed from the light source unit 10 and emitted. The light source unit 10 includes a light source 13 having a reflector 11 and an ultra-high pressure mercury lamp 12, a rod integrator 15, and a condenser lens 16, and the non-polarized white illumination light generated from the light source 13 is converted into the rod integrator. After being converted to linearly polarized light having a uniform brightness through 15, the light is condensed and emitted by the condenser lens 16.

光源部１０から集光して出射される照明光は、入射光路１７から光路切り替え部２０に入射させ、該光路切り替え部２０により第１光路２１または第２光路２２に選択的に切り替えて、２板式の空間光変調部５０に導く。 The illumination light condensed and emitted from the light source unit 10 is incident on the optical path switching unit 20 from the incident optical path 17, and is selectively switched to the first optical path 21 or the second optical path 22 by the optical path switching unit 20. The light is guided to the plate-type spatial light modulator 50.

光路切り替え部２０は、モータ２５と、該モータ２５の出力軸に取り付けた回転円板２６とを有して構成する。回転円板２６には、図２に平面図を示すように、回転方向に、例えば開口からなる光透過領域２７とミラー面からなる光反射領域２８とを、回転速度および投影画像のフレームレートに応じて形成する。本実施の形態では、回転円板２６を円周方向に１２等分して、光透過領域２７と光反射領域２８とを、それぞれ６個ずつ交互に形成する。 The optical path switching unit 20 includes a motor 25 and a rotating disk 26 attached to the output shaft of the motor 25. As shown in the plan view of FIG. 2, the rotating disk 26 is provided with a light transmitting area 27 made of an opening and a light reflecting area 28 made of a mirror surface, for example, at a rotational speed and a frame rate of a projected image. Form according. In the present embodiment, the rotating disk 26 is equally divided into 12 in the circumferential direction, and six light transmitting regions 27 and six light reflecting regions 28 are alternately formed.

図１において、回転円板２６に対する光源部１０からの照明光の入射位置Ｐ１および回転円板２６から２板式の空間光変調部５０への照明光の出射位置Ｐ２は、図２に示すように、一方が光透過領域２７に位置するとき、他方は光反射領域２８に位置するように異なる位置に設定する。また、回転円板２６は、入射位置Ｐ１への照明光の入射光路１７および出射位置Ｐ２からの照明光の出射光路１８に対して、それぞれ４５度傾斜して配置して、入射位置Ｐ１と出射位置Ｐ２との間で、回転円板２６の一方の面側に第１光路２１を、他方の面側に第２光路２２をそれぞれ形成する。 In FIG. 1, the incident position P1 of the illumination light from the light source unit 10 with respect to the rotating disk 26 and the emission position P2 of the illumination light from the rotating disk 26 to the two-plate spatial light modulator 50 are as shown in FIG. When one is located in the light transmission region 27, the other is set at a different position so as to be located in the light reflection region 28. The rotating disk 26 is disposed at an inclination of 45 degrees with respect to the incident optical path 17 of the illumination light to the incident position P1 and the outgoing optical path 18 of the illumination light from the exit position P2, respectively. A first optical path 21 is formed on one surface side of the rotating disk 26 and a second optical path 22 is formed on the other surface side with respect to the emission position P2.

第１光路２１には、入射位置Ｐ１に位置する回転円板２６の光透過領域２７を透過した照明光を反射させて平行光とする第１放物面ミラー３１と、該第１放物面ミラー３１を経た照明光を反射させて収束光として出射位置に導く第２放物面ミラー３２と、これら第１放物面ミラー３１と第２放物面ミラー３２との間の平行光の光路中に配置した第１波長領域選択素子３３とを有する第１光路光学系３４を設ける。 The first optical path 21 includes a first paraboloid mirror 31 that reflects the illumination light transmitted through the light transmission region 27 of the rotating disk 26 located at the incident position P1 to be parallel light, and the first paraboloid. A second parabolic mirror 32 that reflects the illumination light that has passed through the mirror 31 and guides it to the exit position as convergent light, and an optical path of parallel light between the first parabolic mirror 31 and the second parabolic mirror 32 A first optical path optical system 34 having a first wavelength region selection element 33 disposed therein is provided.

同様に、第２光路２２には、入射位置Ｐ１に位置する回転円板２６の光反射領域２８で反射された照明光を反射させて平行光とする第３放物面ミラー３５と、該第３放物面ミラー３５を経た照明光を反射させて収束光として出射位置に導く第４放物面ミラー３６と、これら第３放物面ミラー３５と第４放物面ミラー３６との間の平行光の光路中に配置した第２波長領域選択素子３７とを有する第２光路光学系３８を設ける。 Similarly, the second optical path 22 includes a third paraboloidal mirror 35 that reflects the illumination light reflected by the light reflecting region 28 of the rotating disk 26 located at the incident position P1 to be parallel light, and the first parabolic mirror 35. A fourth paraboloidal mirror 36 that reflects the illumination light that has passed through the three parabolic mirrors 35 and guides it to the emission position as convergent light; and between the third parabolic mirror 35 and the fourth parabolic mirror 36. A second optical path optical system 38 having a second wavelength region selection element 37 disposed in the optical path of the parallel light is provided.

本実施の形態では、第１波長領域選択素子３３を黄色の色フィルタをもって構成し、この第１波長領域選択素子３３により、光源部１０からの白色光の照明光から、第１波長領域の光として、Ｒ光とＧ光とを透過させて選択する。また、第２波長領域選択素子３７は、マゼンダの色フィルタをもって構成し、この第２波長領域選択素子３７により、光源部１０からの白色光の照明光から、第２波長領域の光として、Ｒ光とＢ光とを透過させて選択する。 In the present embodiment, the first wavelength region selection element 33 is configured with a yellow color filter, and the first wavelength region selection element 33 causes the light in the first wavelength region to be generated from the white illumination light from the light source unit 10. Are selected by transmitting R light and G light. Further, the second wavelength region selection element 37 is configured with a magenta color filter, and the second wavelength region selection element 37 converts the white light from the light source unit 10 into light in the second wavelength region as R light. Select by transmitting light and B light.

また、本実施の形態では、光源部１０からの照明光を、集光レンズ１６により回転円板２６への入射位置Ｐ１に集光させるとともに、第１光路２１および第２光路２２による照明光をそれぞれ第２放物面ミラー３２および第４放物面ミラー３６により回転円板２６からの出射位置Ｐ２に集光させる。すなわち、第１光路光学系３４および第２光路光学系３８により、それぞれ入射位置Ｐ１における光源像を出射位置Ｐ２に中継する。 In the present embodiment, the illumination light from the light source unit 10 is condensed at the incident position P1 to the rotating disk 26 by the condenser lens 16, and the illumination light from the first optical path 21 and the second optical path 22 is condensed. The second parabolic mirror 32 and the fourth parabolic mirror 36 respectively focus the light on the emission position P2 from the rotating disk 26. That is, the light source image at the incident position P1 is relayed to the emission position P2 by the first optical path optical system 34 and the second optical path optical system 38, respectively.

このようにして、モータ２５により回転円板２６を回転させることにより、入射光路１７から入射した白色光の照明光を、第１光路２１と第２光路２２とに交互に切り替えて、第１光路２１が選択されたときは、第１波長領域選択素子３３によりＲ光およびＧ光を選択して出射光路１８に導き、第２光路２２が選択されたときは、第２波長領域選択素子３７によりＲ光およびＢ光を選択して出射光路１８に導いて、２板式の空間光変調部５０へ入射させるようにする。 Thus, by rotating the rotating disk 26 by the motor 25, the white illumination light incident from the incident optical path 17 is alternately switched between the first optical path 21 and the second optical path 22, and the first optical path is switched. When 21 is selected, R light and G light are selected by the first wavelength region selection element 33 and guided to the outgoing optical path 18, and when the second optical path 22 is selected, the second wavelength region selection element 37 is selected. Thus, the R light and the B light are selected and guided to the outgoing optical path 18 so as to be incident on the two-plate spatial light modulator 50.

２板式の空間光変調部５０は、コリメータレンズ５１と、ＴＩＲ（Total Internal Reflection）プリズム５２と、ダイクロイックプリズム５３と、２枚の反射型の空間光変調素子５４，５５とを有して構成する。 The two-plate spatial light modulator 50 includes a collimator lens 51, a TIR (Total Internal Reflection) prism 52, a dichroic prism 53, and two reflective spatial light modulators 54 and 55. .

光路切り替え部２０からの照明光は、コリメータレンズ５１により平行光に変換してＴＩＲプリズム５２に入射させ、ここで全反射させてダイクロイックプリズム５３に入射させる。 Illumination light from the optical path switching unit 20 is converted into parallel light by the collimator lens 51 and incident on the TIR prism 52, where it is totally reflected and incident on the dichroic prism 53.

ダイクロイックプリズム５３は、例えば、Ｒ光は反射させ、Ｇ光およびＢ光は透過させるように構成して、ダイクロイックプリズム５３で反射されて出射するＲ光を空間光変調素子５４に入射させ、ダイクロイックプリズム５３を透過して出射されるＧ光およびＢ光を空間光変調素子５５に入射させる。 The dichroic prism 53 is configured to reflect R light and transmit G light and B light, for example, and causes the R light reflected and emitted from the dichroic prism 53 to enter the spatial light modulation element 54, so that the dichroic prism The G light and the B light transmitted through 53 are made incident on the spatial light modulator 55.

空間光変調素子５４，５５は、例えば、変調光を入射方向とは異なる方向に反射させるTexas Instruments社の登録商標であるＤＭＤ（Digital Micromirror Device）を用い、空間光変調素子５４によりＲ光を変調し、空間光変調素子５５によりＧ光またはＢ光を変調して、それぞれの変調光をダイクロイックプリズム５３に入射させる。 The spatial light modulation elements 54 and 55 use, for example, DMD (Digital Micromirror Device), a registered trademark of Texas Instruments, which reflects modulated light in a direction different from the incident direction, and modulates R light by the spatial light modulation element 54. Then, the G light or the B light is modulated by the spatial light modulation element 55, and each modulated light is incident on the dichroic prism 53.

ダイクロイックプリズム５３に入射したＲ光の変調光とＧ光またはＢ光の変調光は、該ダイクロイックプリズム５３で合成し、その合成された変調光は、ＴＩＲプリズム５２を透過させて、投影レンズ６１により、例えば偏光スクリーンよりなるスクリーン６２に投影光として投影する。 The modulated light of R light and the modulated light of G light or B light incident on the dichroic prism 53 is synthesized by the dichroic prism 53, and the synthesized modulated light is transmitted through the TIR prism 52 and is projected by the projection lens 61. For example, the projection light is projected onto a screen 62 made of a polarizing screen.

すなわち、本実施の形態では、図３にＲ，Ｇ，Ｂの各光の投影タイミングを示すように、光路切り替え部２０の第１光路２１を経て、空間光変調部５０に、Ｒ光およびＧ光が入射する場合は、空間光変調素子５４によりＲ光を変調し、空間光変調素子５５によりＧ光を変調して、それらの変調光の合成光をスクリーン６２に投影する。また、光路切り替え部２０の第２光路２２を経て、空間光変調部５０に、Ｒ光およびＢ光が入射する場合は、空間光変調素子５４によりＲ光を変調し、空間光変調素子５５によりＢ光を変調して、それらの変調光の合成光をスクリーン６２に投影する。したがって、Ｒ光の変調光の投影時間を１とすると、Ｇ光およびＢ光の各変調光の投影時間は、０．５となる。 That is, in the present embodiment, as shown in FIG. 3, the projection timing of each of the R, G, and B lights, the first light path 21 of the light path switching unit 20 is passed to the spatial light modulation unit 50 to receive the R light and G light. When light is incident, the R light is modulated by the spatial light modulation element 54, the G light is modulated by the spatial light modulation element 55, and the combined light of these modulated lights is projected onto the screen 62. Further, when R light and B light are incident on the spatial light modulator 50 via the second optical path 22 of the optical path switching unit 20, the R light is modulated by the spatial light modulator 54, and the spatial light modulator 55 The B light is modulated, and the combined light of the modulated light is projected onto the screen 62. Therefore, if the projection time of the modulated light of R light is 1, the projection time of each modulated light of G light and B light is 0.5.

以上のように、本実施の形態によれば、回転式のカラーフィルタを用いることなく、光源部１０からの照明光の光路を、光路切り替え部２０により、第１光路２１と第２光路２２とに交互に切り替え、第１光路２１では第１波長領域選択素子３３によりＲ光およびＧ光を透過させ、第２光路２２では第２波長領域選択素子３７によりＲ光およびＢ光を透過させるようにしたので、所望の波長帯域を有する照明光を安定して得ることができ、長期間に亘って安定した色再現性を得ることができる。 As described above, according to the present embodiment, the optical path of the illumination light from the light source unit 10 is changed between the first optical path 21 and the second optical path 22 by the optical path switching unit 20 without using a rotary color filter. In the first optical path 21, R light and G light are transmitted by the first wavelength region selection element 33, and R light and B light are transmitted by the second wavelength region selection element 37 in the second optical path 22. Therefore, illumination light having a desired wavelength band can be stably obtained, and stable color reproducibility can be obtained over a long period of time.

しかも、第１波長領域選択素子３３および第２波長領域選択素子３７は、それぞれ平行光の光路中に配置するようにしたので、入射角による特性変化の影響を受けることもない。したがって、所望の波長帯域を有する照明光をより安定して得ることができる。 In addition, since the first wavelength region selection element 33 and the second wavelength region selection element 37 are arranged in the optical path of the parallel light, they are not affected by the characteristic change due to the incident angle. Therefore, illumination light having a desired wavelength band can be obtained more stably.

また、光源部１０からの照明光を、光路切り替え部２０の回転円板２６への入射位置Ｐ１において集光させるとともに、第１光路２１および第２光路２２による照明光をそれぞれ回転円板２６からの出射位置Ｐ２において集光させるようにしたので、回転円板に２６に対する照明光のスポット径を小さくできる。したがって、Ｒ光およびＧ光と、Ｒ光およびＢ光との面順次の切り替え時間、すなわちブランキング期間を短くできるので、表示画像のフレームレートを高くできる。 Further, the illumination light from the light source unit 10 is condensed at the incident position P1 to the rotating disk 26 of the optical path switching unit 20, and the illumination light from the first optical path 21 and the second optical path 22 is respectively transmitted from the rotating disk 26. Since the light is condensed at the emission position P2, the spot diameter of the illumination light with respect to the rotating disk 26 can be reduced. Therefore, the frame sequential switching time between the R light and G light, and the R light and B light, that is, the blanking period can be shortened, so that the frame rate of the display image can be increased.

しかも、回転円板２６は、例えば開口からなる光透過領域２７と、ミラー面からなる光反射領域２８とを形成して構成できるので、入射位置Ｐ１および出射位置Ｐ２において照明光を集光させても、熱による影響を受けることも殆どない。したがって、長期間に亘って安定して使用することができる。 In addition, the rotating disk 26 can be configured by forming, for example, a light transmission region 27 formed of an opening and a light reflection region 28 formed of a mirror surface, so that the illumination light is condensed at the incident position P1 and the emission position P2. However, it is hardly affected by heat. Therefore, it can be used stably over a long period of time.

また、本実施の形態では、空間光変調素子５４，５５として、ＤＭＤ（登録商標）を用いているので、反射型液晶パネルを用いる場合と比較して、光の損失を少なくでき、光の利用効率をさらに向上できる利点がある。 In this embodiment, since DMD (registered trademark) is used as the spatial light modulation elements 54 and 55, the loss of light can be reduced as compared with the case where a reflective liquid crystal panel is used. There is an advantage that the efficiency can be further improved.

さらに、本実施の形態では、超高圧水銀ランプ１２を用いて光源１３を構成し、Ｒ，Ｇ，Ｂの各変調光の投影時間を、Ｒ：Ｇ：Ｂ＝１．０：０．５：０．５、としているので、超高圧水銀ランプ１２からのＲ，Ｇ，Ｂの各光を最高強度で無駄なく利用して、色再現性を向上することができる。 Furthermore, in the present embodiment, the ultrahigh pressure mercury lamp 12 is used to configure the light source 13, and the projection time of each of the R, G, B modulated light is R: G: B = 1.0: 0.5: Therefore, the color reproducibility can be improved by using the R, G, and B lights from the ultra-high pressure mercury lamp 12 at the highest intensity without waste.

すなわち、超高圧水銀ランプ１２から放射される光のスペクトル分布は、例えば図４に示すよう、Ｂ光領域およびＧ光領域と比較して、Ｒ光領域の強度が不足したスペクトル分布となる。この場合、図５に示すｘｙ色度図上で、ＨＤＴＶ（High Definition TeleVision）で規定されている白点Ｗ１を再現するには、各光の強度比を、Ｒ：Ｇ：Ｂ＝１：０．６：０．４、程度に調整する必要がある。 That is, for example, as shown in FIG. 4, the spectral distribution of the light emitted from the ultrahigh pressure mercury lamp 12 is a spectral distribution in which the intensity of the R light region is insufficient as compared with the B light region and the G light region. In this case, in order to reproduce the white point W1 defined by HDTV (High Definition TeleVision) on the xy chromaticity diagram shown in FIG. 5, the intensity ratio of each light is set to R: G: B = 1: 0. .6: It is necessary to adjust to about 0.4.

しかし、本実施の形態におけるように、Ｒ，Ｇ，Ｂの各変調光の投影時間を、Ｒ：Ｇ：Ｂ＝１．０：０．５：０．５、とすると、Ｒ，Ｇ，Ｂの各光を最高強度で使用した場合の色度点Ｗ２を、ＨＤＴＶにおける白点Ｗ１の近傍にすることができる。したがって、上述したように、超高圧水銀ランプ１２からのＲ，Ｇ，Ｂの各光を最高強度で無駄なく利用して、色再現性を向上することができる。 However, as in the present embodiment, assuming that the projection time of each of the R, G, and B modulated light is R: G: B = 1.0: 0.5: 0.5, R, G, B The chromaticity point W2 when each of these lights is used at the maximum intensity can be in the vicinity of the white point W1 in HDTV. Therefore, as described above, it is possible to improve the color reproducibility by using each light of R, G, and B from the ultra-high pressure mercury lamp 12 at the highest intensity without waste.

なお、超高圧水銀ランプ１２からのＲ，Ｇ，Ｂの各光を、それぞれ空間光変調素子で変調して合成する３板式とした場合において、Ｒ，Ｇ，Ｂの各光を最高強度で使用した場合の色度点Ｗ３は、Ｒ光領域の強度が足りないため、Ｗ１の位置からＢ領域およびＧ領域にシフトした位置となる。したがって、３板式で白を再現するには、各光の強度比を、Ｒ：Ｇ：Ｂ＝１：０．６：０．４、程度に調整する必要があるため、Ｇ光で４０％、Ｂ光で６０％の光が無駄となる。 In the case of a three-plate type in which R, G, and B light from the ultra-high pressure mercury lamp 12 is modulated by a spatial light modulation element and combined, each light of R, G, and B is used with the highest intensity. In this case, since the intensity of the R light region is insufficient, the chromaticity point W3 is a position shifted from the position of W1 to the B region and the G region. Therefore, in order to reproduce white with a three-plate system, it is necessary to adjust the intensity ratio of each light to about R: G: B = 1: 0.6: 0.4. 60% of the B light is wasted.

（第２実施の形態）
図６は、本発明の第２実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。本実施の形態は、図１に示した第１実施の形態において、光路切り替え部２０により切り替えられる第１光路２１の第１光路光学系３４を、第１レンズ７１と、第１ミラー７２と、第２レンズ７３と、第１波長領域選択素子３３とで構成して、入射位置Ｐ１に集光して回転円板２６を透過する光源部１０からの照明光を、第１レンズ７１により平行光に変換した後、第１ミラー７２で反射させて第２レンズ７３により出射位置Ｐ２に集光させる。なお、第１波長領域選択素子３３は、第１レンズ７１と第２レンズ７３との間の平行光の光路中（図６では、第１ミラー７２と第２レンズ７３との間の光路中）に配置する。 (Second Embodiment)
FIG. 6 is a diagram showing the configuration of the main part of the illumination optical system for a two-plate projector according to the second embodiment of the present invention. In the present embodiment, in the first embodiment shown in FIG. 1, the first optical path optical system 34 of the first optical path 21 switched by the optical path switching unit 20 includes a first lens 71, a first mirror 72, The second lens 73 and the first wavelength region selection element 33 are used to illuminate the illumination light from the light source unit 10 that is condensed at the incident position P1 and transmitted through the rotating disk 26 with the first lens 71. Then, the light is reflected by the first mirror 72 and condensed by the second lens 73 at the emission position P2. The first wavelength region selection element 33 is in the optical path of parallel light between the first lens 71 and the second lens 73 (in FIG. 6, in the optical path between the first mirror 72 and the second lens 73). To place.

同様に、光路切り替え部２０により切り替えられる第２光路２２の第２光路光学系３８は、第３レンズ７５と、第２ミラー７６と、第４レンズ７７と、第２波長領域選択素子３７とで構成して、入射位置Ｐ１に集光して回転円板２６で反射される光源部１０からの照明光を、第３レンズ７５により平行光に変換した後、第２ミラー７６で反射させて、第４レンズ７７により出射位置Ｐ２に集光させる。なお、第２波長領域選択素子３７は、第３レンズ７５と第４レンズ７７との間の平行光の光路中（図６では、第２ミラー７６と第４レンズ７７との間の光路中）に配置する。その他の構成および作用は、第１実施の形態と同様である。 Similarly, the second optical path optical system 38 of the second optical path 22 switched by the optical path switching unit 20 includes a third lens 75, a second mirror 76, a fourth lens 77, and a second wavelength region selection element 37. The illumination light from the light source unit 10 that is condensed at the incident position P1 and reflected by the rotating disk 26 is converted into parallel light by the third lens 75, and then reflected by the second mirror 76. The light is condensed at the emission position P2 by the fourth lens 77. The second wavelength region selection element 37 is in the optical path of parallel light between the third lens 75 and the fourth lens 77 (in FIG. 6, in the optical path between the second mirror 76 and the fourth lens 77). To place. Other configurations and operations are the same as those in the first embodiment.

本実施の形態においても、第１実施の形態と同様の効果が得られる。 Also in this embodiment, the same effect as the first embodiment can be obtained.

（第３実施の形態）
図７は、本発明の第３実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。本実施の形態は、図１に示した第１実施の形態において、光路切り替え部２０により切り替えられる第１光路２１の第１光路光学系３４を、第１楕円ミラー８１と第１波長領域選択素子３３とで構成して、入射位置Ｐ１に集光して回転円板２６を透過する光源部１０からの照明光を、第１楕円ミラー８１で反射させて出射位置Ｐ２に集光させるとともに、この第１光路２１の任意の位置（図７では、第１楕円ミラー８１と出射位置Ｐ２との間の光路中）に、第１波長領域選択素子３３を配置する。 (Third embodiment)
FIG. 7 is a diagram showing a configuration of a main part of an illumination optical system for a two-plate projection apparatus according to the third embodiment of the present invention. In this embodiment, in the first embodiment shown in FIG. 1, the first optical path optical system 34 of the first optical path 21 switched by the optical path switching unit 20 is replaced with a first elliptical mirror 81 and a first wavelength region selection element. 33, the illumination light from the light source unit 10 that is condensed at the incident position P1 and transmitted through the rotating disk 26 is reflected by the first elliptical mirror 81 and condensed at the emission position P2, and this The first wavelength region selection element 33 is disposed at an arbitrary position of the first optical path 21 (in the optical path between the first elliptical mirror 81 and the emission position P2 in FIG. 7).

同様に、光路切り替え部２０により切り替えられる第２光路２２の第２光路光学系３８は、第２楕円ミラー８２と第２波長領域選択素子３７とで構成して、入射位置Ｐ１に集光して回転円板２６で反射される光源部１０からの照明光を、第２楕円ミラー８２で反射させて出射位置Ｐ２に集光させるとともに、この第２光路２２の任意の位置（図７では、第２楕円ミラー８２と出射位置Ｐ２との間の光路中）に、第２波長領域選択素子３７を配置する。その他の構成および作用は、第１実施の形態と同様である。 Similarly, the second optical path optical system 38 of the second optical path 22 switched by the optical path switching unit 20 is configured by the second elliptical mirror 82 and the second wavelength region selection element 37, and is condensed at the incident position P1. The illumination light from the light source unit 10 reflected by the rotating disk 26 is reflected by the second elliptical mirror 82 and condensed at the emission position P2, and at any position on the second optical path 22 (in FIG. The second wavelength region selection element 37 is disposed in the optical path between the two elliptical mirror 82 and the emission position P2. Other configurations and operations are the same as those in the first embodiment.

本実施の形態によれば、第１実施の形態と同様の効果が得られる他、第１実施の形態や第２実施の形態と比較して、第１光路光学系３４および第２光路光学系３８の部品点数を少なくできるので、簡単かつ安価にできる利点がある。 According to the present embodiment, the same effects as those of the first embodiment can be obtained, and the first optical path optical system 34 and the second optical path optical system are compared with the first embodiment and the second embodiment. Since the number of parts of 38 can be reduced, there is an advantage that it can be easily and inexpensively.

（第４実施の形態）
図８は、本発明の第４実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。本実施の形態は、図１に示した第１実施の形態において、光路切り替え部２０により切り替えられる第１光路２１の第１光路光学系３４を、第１共通レンズ９１と、第３ミラー９２と、第１波長領域選択素子３３とで構成して、入射位置Ｐ１に集光して回転円板２６を透過する光源部１０からの照明光を、第１共通レンズ９１により平行光に変換した後、第３ミラー９２で反射させ、さらに、第１共通レンズ９１により出射位置Ｐ２に集光させる。なお、第１波長領域選択素子３３は、第１共通レンズ９１と第３ミラー９２との間の平行光の光路中（図８では、第３ミラー９２の反射光路中）に配置する。 (Fourth embodiment)
FIG. 8 is a diagram showing a configuration of a main part of an illumination optical system for a two-plate projection apparatus according to the fourth embodiment of the present invention. In this embodiment, in the first embodiment shown in FIG. 1, the first optical path optical system 34 of the first optical path 21 switched by the optical path switching unit 20 is replaced with a first common lens 91, a third mirror 92, After the illumination light from the light source unit 10 configured by the first wavelength region selection element 33 and condensed at the incident position P1 and transmitted through the rotating disk 26 is converted into parallel light by the first common lens 91 Then, the light is reflected by the third mirror 92 and further condensed by the first common lens 91 at the emission position P2. The first wavelength region selection element 33 is disposed in the optical path of parallel light between the first common lens 91 and the third mirror 92 (in the reflected optical path of the third mirror 92 in FIG. 8).

同様に、光路切り替え部２０により切り替えられる第２光路２２の第２光路光学系３８は、第２共通レンズ９５と、第４ミラー９６と、第２波長領域選択素子３７とで構成して、入射位置Ｐ１に集光して回転円板２６で反射される光源部１０からの照明光を、第２共通レンズ９５により平行光に変換した後、第４ミラー９６で反射させ、さらに、第２共通レンズ９５により出射位置Ｐ２に集光させる。なお、第２波長領域選択素子３７は、第２共通レンズ９５と第４ミラー９６との間の平行光の光路中（図８では、第４ミラー９６の反射光路中）に配置する。その他の構成および作用は、第１実施の形態と同様である。 Similarly, the second optical path optical system 38 of the second optical path 22 switched by the optical path switching unit 20 includes a second common lens 95, a fourth mirror 96, and a second wavelength region selection element 37, and is incident. Illumination light from the light source unit 10 that is condensed at the position P1 and reflected by the rotating disk 26 is converted into parallel light by the second common lens 95, then reflected by the fourth mirror 96, and further reflected by the second common lens. The light is condensed at the emission position P2 by the lens 95. The second wavelength region selection element 37 is disposed in the optical path of parallel light between the second common lens 95 and the fourth mirror 96 (in the reflected light path of the fourth mirror 96 in FIG. 8). Other configurations and operations are the same as those in the first embodiment.

（第５実施の形態）
図９は、本発明の第５実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。本実施の形態は、図１に示した第１実施の形態において、光源部１０を、光路切り替え部２０に対して９０度回転して配置して、光源部１０からの照明光を光路切り替え部２０により第１光路２１または第２光路２２に選択的に切り替えて、２板式の空間光変調部５０に導く。 (Fifth embodiment)
FIG. 9 is a diagram showing a configuration of a main part of an illumination optical system for a two-plate projection apparatus according to the fifth embodiment of the present invention. In the present embodiment, in the first embodiment shown in FIG. 1, the light source unit 10 is rotated 90 degrees with respect to the optical path switching unit 20, and the illumination light from the light source unit 10 is transmitted to the optical path switching unit. 20 is selectively switched to the first optical path 21 or the second optical path 22 and guided to the two-plate spatial light modulator 50.

このため、回転円板２６に対する光源部１０からの照明光の入射位置Ｐ１、および回転円板２６から２板式の空間光変調部５０への照明光の出射位置Ｐ２は、図１０に示すように、一方が光透過領域２７に位置するときは、他方も他の光透過領域２７に位置し、一方が光反射領域２８に位置するときは、他方も他の光反射領域２８に位置するように設定する。 Therefore, the incident position P1 of the illumination light from the light source unit 10 with respect to the rotating disk 26 and the emission position P2 of the illumination light from the rotating disk 26 to the two-plate spatial light modulation unit 50 are as shown in FIG. When one is located in the light transmission region 27, the other is located in the other light transmission region 27, and when one is located in the light reflection region 28, the other is located in the other light reflection region 28. Set.

このようにして、モータ２５により回転円板２６を回転させることにより、入射光路１７から入射位置Ｐ１に入射した照明光を、回転円板２６で交互に反射および透過させて、第１光路２１と第２光路２２とに交互に入射させる。そして、回転円板２６で反射されて第１光路２１に入射した照明光は、第１光路光学系３４により、Ｒ光およびＧ光を選択して、出射位置Ｐ２において回転円板２６で反射させて出射光路１８に導く。また、回転円板２６を透過して第２光路２２に入射した照明光は、第２光路光学系３８により、Ｒ光およびＢ光を選択して、出射位置Ｐ２において回転円板２６を透過させて出射光路１８に導く。その他の構成および作用は、第１実施の形態と同様である。 Thus, by rotating the rotating disk 26 by the motor 25, the illumination light incident on the incident position P1 from the incident light path 17 is alternately reflected and transmitted by the rotating disk 26, and the first optical path 21 and The light is alternately incident on the second optical path 22. The illumination light reflected by the rotating disk 26 and incident on the first optical path 21 is selected by the first optical path optical system 34 as R light and G light and reflected by the rotating disk 26 at the emission position P2. To the outgoing optical path 18. The illumination light that has passed through the rotating disk 26 and entered the second optical path 22 is selected by the second optical path optical system 38 as R light and B light, and is transmitted through the rotating disk 26 at the emission position P2. To the outgoing optical path 18. Other configurations and operations are the same as those in the first embodiment.

したがって、本実施の形態においても、第１実施の形態と同様の効果が得られる。 Therefore, also in this embodiment, the same effect as the first embodiment can be obtained.

なお、本発明は、上記実施の形態にのみ限定されるものではなく、幾多の変形または変更が可能である。例えば、光源部１０は、高圧水銀ランプに限らず、キセノンランプ等の照明光を出射する公知のランプを用いて構成することもできるし、Ｒ，Ｇ，Ｂの３色ＬＥＤや３色レーザを用いて構成することもできる。 In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, the light source unit 10 is not limited to a high-pressure mercury lamp, and can be configured by using a known lamp that emits illumination light such as a xenon lamp, or an R, G, B three-color LED or a three-color laser. It can also be configured.

また、上記実施の形態では、空間光変調素子５４，５５としてＤＭＤ（登録商標）を用いたが、反射型液晶パネルを用いることもできる。さらに、上記各実施の形態では、光源部１０からの照明光を、光路切り替え部２０の回転円板２６への入射位置Ｐ１および回転円板２６からの出射位置Ｐ２において集光させるようにしたが、入射位置Ｐ１や出射位置Ｐ２からずれた位置に集光させてもよい。 In the above embodiment, DMD (registered trademark) is used as the spatial light modulators 54 and 55, but a reflective liquid crystal panel can also be used. Further, in each of the above embodiments, the illumination light from the light source unit 10 is condensed at the incident position P1 to the rotating disk 26 and the emitting position P2 from the rotating disk 26 of the optical path switching unit 20. The light may be condensed at a position shifted from the incident position P1 or the emission position P2.

また、光源部１０から照明光を平行光で出射させ、その平行光の状態を維持したまま、入射位置Ｐ１および出射位置Ｐ２を経て空間光変調部５０に導くように構成することもできる。この場合、第１光路光学系３４は、反射ミラーおよび第１波長領域選択素子３３で構成でき、同様に、第２光路光学系３８も、反射ミラーおよび第２波長領域選択素子３７で構成できるので、簡単かつ安価にできる。 Alternatively, the illumination light can be emitted from the light source unit 10 as parallel light and guided to the spatial light modulation unit 50 through the incident position P1 and the emission position P2 while maintaining the state of the parallel light. In this case, the first optical path optical system 34 can be composed of the reflection mirror and the first wavelength region selection element 33. Similarly, the second optical path optical system 38 can be composed of the reflection mirror and the second wavelength region selection element 37. Can be simple and inexpensive.

さらに、回転円板２６は、光源部１０からの照明光の入射光路１７および空間光変調部５０への出射光路１８に対して、４５度に傾斜して配置する場合に限らず、任意の角度に設定することができる。特に、第４実施の形態の場合には、入射位置Ｐ１おける入射光路１７の入射角および出射位置Ｐ２における出射光路１８の出射角が、４５度よりも小さくなるように回転円板２６を配置することにより、第１共通レンズ９１および第２共通レンズ９５の小型化を図ることができる。 Further, the rotating disk 26 is not limited to the case where the rotating disk 26 is disposed at an inclination of 45 degrees with respect to the incident light path 17 of the illumination light from the light source unit 10 and the outgoing light path 18 to the spatial light modulation unit 50, and is arbitrary. Can be set to angle. In particular, in the case of the fourth embodiment, the rotating disk 26 is arranged so that the incident angle of the incident optical path 17 at the incident position P1 and the outgoing angle of the outgoing optical path 18 at the outgoing position P2 are smaller than 45 degrees. By doing so, the size of the first common lens 91 and the second common lens 95 can be reduced.

さらに、第５実施の形態に示した光源部１０の配置は、第２〜４実施の形態にも同様に適用して、回転円板２６で反射されて第１光路２１に入射した照明光を、第１光路光学系３４を経て再び回転円板２６で反射させて２板式の空間光変調部５０に導き、回転円板２６を透過して第２光路２２に入射した照明光は、第２光路光学系３８を経て再び回転円板２６を透過させて２板式の空間光変調部５０に導くように構成することもできる。したがって、本発明によれば、２板式投影装置に組み込む場合に、レイアウトの自由度を向上することができる。また、回転円板２６に代えて、入射位置Ｐ１および出射位置Ｐ２に対応する位置に、それぞれ跳ね上げミラー等の回動ミラーを配置して、同様に、入射する照明光を選択的に透過または反射させるように構成することもできる。 Furthermore, the arrangement of the light source unit 10 shown in the fifth embodiment is similarly applied to the second to fourth embodiments, and the illumination light reflected by the rotating disk 26 and incident on the first optical path 21 is used. The illumination light that has been reflected by the rotating disk 26 again through the first optical path optical system 34, led to the two-plate spatial light modulator 50, and transmitted through the rotating disk 26 and incident on the second optical path 22 is second A configuration may also be adopted in which the rotating disk 26 is transmitted again through the optical path optical system 38 and guided to the two-plate spatial light modulator 50. Therefore, according to the present invention, when incorporated in a two-plate projection apparatus, the degree of freedom in layout can be improved. Further, instead of the rotating disk 26, rotating mirrors such as a flip-up mirror are respectively arranged at positions corresponding to the incident position P1 and the emission position P2, and similarly, the incident illumination light is selectively transmitted or transmitted. It can also be configured to reflect.

本発明の第１実施の形態に係る照明光学系を用いる２板式投影装置の概略構成を示す図である。1 is a diagram illustrating a schematic configuration of a two-plate projection apparatus using an illumination optical system according to a first embodiment of the present invention. 図１に示す回転円板の平面図である。It is a top view of the rotation disc shown in FIG. 図１に示す投影装置によるＲ，Ｇ，Ｂの各光の投影タイミングを示す図である。It is a figure which shows the projection timing of each light of R, G, B by the projector shown in FIG. 超高圧水銀ランプから放射される光のスペクトル分布を示す図である。It is a figure which shows the spectral distribution of the light radiated | emitted from an ultrahigh pressure mercury lamp. 図１に示す投影装置による色度点を、ＨＤＴＶにおける白点および３板式による色度点と比較して示す図である。It is a figure which compares the chromaticity point by the projector shown in FIG. 1 with the white point in HDTV, and the chromaticity point by a 3 plate type. 本発明の第２実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。It is a figure which shows the structure of the principal part of the illumination optical system for 2 plate type projectors which concerns on 2nd Embodiment of this invention. 本発明の第３実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。It is a figure which shows the structure of the principal part of the illumination optical system for 2 plate type projectors which concerns on 3rd Embodiment of this invention. 本発明の第４実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。It is a figure which shows the structure of the principal part of the illumination optical system for 2 plate type projectors which concerns on 4th Embodiment of this invention. 本発明の第５実施の形態に係る２板式投影装置用照明光学系の要部の構成を示す図である。It is a figure which shows the structure of the principal part of the illumination optical system for 2 plate type projectors which concerns on 5th Embodiment of this invention. 第５実施の形態の回転円板における入射位置と出射位置との関係を示す平面図である。It is a top view which shows the relationship between the incident position in the rotary disc of 5th Embodiment, and an output position. 従来の２板式投影装置の一例を示す図である。It is a figure which shows an example of the conventional 2 plate type | mold projection apparatus. 図１１に示すカラーフィルタの平面図である。It is a top view of the color filter shown in FIG. 図１１の部分詳細平面図である。FIG. 12 is a partial detailed plan view of FIG. 11.

符号の説明Explanation of symbols

１０光源部
１１リフレクタ
１２超高圧水銀ランプ
１３光源
１５ロッドインテグレータ
１６集光レンズ
１７入射光路
１８出射光路
２０光路切り替え部
２１第１光路
２２第２光路
２５モータ
２６回転円板
２７光透過領域
２８光反射領域
３１第１放物面ミラー
３２第２放物面ミラー
３３第１波長領域選択素子
３４第１光路光学系
３５第３放物面ミラー
３６第４放物面ミラー
３７第２波長領域選択素子
３８第２光路光学系
５０空間光変調部
５１コリメータレンズ
５２ＴＩＲプリズム
５３ダイクロイックプリズム
５４，５５空間光変調素子
６１投影レンズ
６２スクリーン
Ｐ１入射位置
Ｐ２出射位置
７１第１レンズ
７２第１ミラー
７３第２レンズ
７５第３レンズ
７６第２ミラー
７７第４レンズ
８１第１楕円ミラー
８２第２楕円ミラー
９１第１共通レンズ
９２第３ミラー
９５第２共通レンズ
９６第４ミラー DESCRIPTION OF SYMBOLS 10 Light source part 11 Reflector 12 Super high pressure mercury lamp 13 Light source 15 Rod integrator 16 Condensing lens 17 Incident optical path 18 Emission optical path 20 Optical path switching part 21 1st optical path 22 2nd optical path 25 Motor 26 Rotating disk 27 Light transmission area 28 Light Reflection region 31 First parabolic mirror 32 Second parabolic mirror 33 First wavelength region selection element 34 First optical path optical system 35 Third parabolic mirror 36 Fourth parabolic mirror 37 Second wavelength region selection element 38 Second optical path optical system 50 Spatial light modulator 51 Collimator lens 52 TIR prism 53 Dichroic prism 54,55 Spatial light modulator 61 Projection lens 62 Screen P1 Incident position P2 Emission position 71 First lens 72 First mirror 73 Second lens 75 Third lens 76 Second mirror 77 Fourth lens 81 1 ellipsoidal mirror 82 second ellipsoidal mirror 91 first common lens 92 the third mirror 95 second common lens 96 the fourth mirror

Claims

白色光の照明光を出射する光源部と、
該光源部と２板式の空間変調部との間の照明光の光路を第１光路または第２光路に選択的に切り替える光路切り替え部と、
前記第１光路に配置され、前記照明光から第１波長領域の光を選択する第１波長領域選択素子を有する第１光路光学系と、
前記第２光路に配置され、前記照明光から第２波長領域の光を選択する第２波長領域選択素子を有する第２光路光学系と、
を有する、ことを特徴とする２板式投影装置用照明光学系。 A light source unit that emits white illumination light;
An optical path switching unit that selectively switches the optical path of the illumination light between the light source unit and the two-plate spatial modulation unit to the first optical path or the second optical path;
A first optical path optical system having a first wavelength region selection element that is disposed in the first optical path and selects light in the first wavelength region from the illumination light;
A second optical path optical system that is disposed in the second optical path and has a second wavelength region selection element that selects light in the second wavelength region from the illumination light;
An illumination optical system for a two-plate projection apparatus, comprising:

前記光路切り替え部は、回転方向にそれぞれ複数の光透過領域および光反射領域を形成した回転円板を有し、該回転円板に対する前記光源部からの照明光の入射位置および前記回転円板から前記２板式の空間光変調部への照明光の出射位置を、一方が一の前記光透過領域に位置するとき、他方は一の前記光反射領域に位置するように異なる位置に設定するとともに、前記入射位置への照明光の入射光路および前記出射位置からの照明光の出射光路に対して、前記回転円板を傾斜して配置し、
前記第１光路および前記第２光路は、前記入射位置と前記出射位置との間で、前記回転円板の一方の面側および他方の面側にそれぞれ形成して、
前記回転円板の前記光透過領域が前記入射位置に位置するときは、該光透過領域を透過した照明光を、前記第１光路を経て前記出射位置に位置する前記回転円板の前記光反射領域で反射させて前記出射光路に導き、
前記回転円板の前記光反射領域が前記入射位置に位置するときは、該光反射領域で反射される照明光を、前記第２光路を経て前記出射位置に位置する前記回転円板の前記光透過領域を透過させて前記出射光路に導くように構成した、ことを特徴とする請求項１に記載の２板式投影装置用照明光学系。 The optical path switching unit includes a rotating disk in which a plurality of light transmission regions and light reflecting regions are formed in the rotation direction, respectively, and the incident position of the illumination light from the light source unit with respect to the rotating disk and the rotation disk The position where the illumination light is emitted to the two-plate spatial light modulator is set to a different position so that when one is located in one light transmission region, the other is located in one light reflection region, With respect to the incident optical path of the illumination light to the incident position and the exit optical path of the illumination light from the exit position, the rotating disk is disposed to be inclined,
The first optical path and the second optical path are formed on one surface side and the other surface side of the rotating disk between the incident position and the emission position, respectively.
When the light transmission region of the rotating disk is positioned at the incident position, the illumination light transmitted through the light transmitting region is reflected by the light of the rotating disk positioned at the emission position via the first optical path. Reflected in the region and led to the outgoing optical path,
When the light reflecting area of the rotating disk is located at the incident position, the illumination light reflected by the light reflecting area is transmitted through the second optical path and the light of the rotating disk located at the emitting position. 2. The illumination optical system for a two-plate projection apparatus according to claim 1, wherein the illumination optical system is configured to transmit a transmission region and guide it to the outgoing optical path.

前記光路切り替え部は、回転方向にそれぞれ複数の光透過領域および光反射領域を形成した回転円板を有し、該回転円板に対する前記光源部からの照明光の入射位置および前記回転円板から前記２板式の空間光変調部への照明光の出射位置を、一方が一の前記光透過領域に位置するとき、他方は他の前記光透過領域に位置し、一方が一の前記光反射領域に位置するとき、他方は他の前記光反射領域に位置するように異なる位置に設定するとともに、前記入射位置への照明光の入射光路および前記出射位置からの照明光の出射光路に対して、前記回転円板を傾斜して配置し、
前記第１光路および前記第２光路は、前記入射位置と前記出射位置との間で、前記回転円板の一方の面側および他方の面側にそれぞれ形成して、
前記回転円板の一の前記光透過領域が前記入射位置に位置するときは、該光透過領域を透過した照明光を、前記第１光路を経て前記出射位置に位置する前記回転円板の他の前記光透過領域を透過させて前記出射光路に導き、
前記回転円板の一の前記光反射領域が前記入射位置に位置するときは、該光反射領域で反射される照明光を、前記第２光路を経て前記出射位置に位置する前記回転円板の他の前記光反射領域で反射させて前記出射光路に導くように構成した、ことを特徴とする請求項１に記載の２板式投影装置用照明光学系。 The optical path switching unit includes a rotating disk in which a plurality of light transmission regions and light reflecting regions are formed in the rotation direction, respectively, and the incident position of the illumination light from the light source unit with respect to the rotating disk and the rotation disk When one of the illumination light emission positions to the two-plate spatial light modulator is located in the one light transmission region, the other is located in the other light transmission region, and the other is the one light reflection region. And the other is set to a different position so as to be located in the other light reflection region, and the incident light path of the illumination light to the incident position and the emission light path of the illumination light from the emission position , The rotating disk is disposed at an inclination,
The first optical path and the second optical path are formed on one surface side and the other surface side of the rotating disk between the incident position and the emission position, respectively.
When the light transmission region of one of the rotating disks is positioned at the incident position, the illumination light transmitted through the light transmitting region is transmitted to the rotating disk positioned at the emission position via the first optical path. Through the light transmission region and led to the outgoing light path,
When the light reflecting area of one of the rotating disks is located at the incident position, the illumination light reflected by the light reflecting area is transmitted to the rotating disk located at the emitting position via the second optical path. 2. The illumination optical system for a two-plate projector according to claim 1, wherein the illumination optical system is configured to be reflected by another light reflection region and guided to the outgoing light path.

前記光源部は、出射する照明光を集光する集光レンズを有する、ことを特徴とする請求項２または３に記載の２板式投影装置用照明光学系。 The illumination optical system for a two-plate projector according to claim 2, wherein the light source unit includes a condenser lens that collects emitted illumination light.

前記第１光路光学系は、前記入射位置から入射する照明光を反射させて平行光とする第１放物面ミラーと、該第１放物面ミラーを経た照明光を反射させて収束光として前記出射位置に導く第２放物面ミラーとを有し、前記第１放物面ミラーと前記第２放物面ミラーとの間の平行光の光路中に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、前記入射位置から入射する照明光を反射させて平行光とする第３放物面ミラーと、該第３放物面ミラーを経た照明光を反射させて収束光として前記出射位置に導く第４放物面ミラーとを有し、前記第３放物面ミラーと前記第４放物面ミラーとの間の平行光の光路中に前記第２波長領域選択素子を配置した、ことを特徴とする請求項４に記載の２板式投影装置用照明光学系。 The first optical path optical system reflects the illumination light incident from the incident position to make parallel light, and reflects the illumination light that has passed through the first parabolic mirror as converged light. A second parabolic mirror that leads to the emission position, and the first wavelength region selection element is disposed in an optical path of parallel light between the first parabolic mirror and the second parabolic mirror. And
The second optical path optical system reflects the illumination light incident from the incident position to make parallel light, and reflects the illumination light that has passed through the third parabolic mirror as converged light. A fourth parabolic mirror that leads to the emission position, and the second wavelength region selection element is disposed in an optical path of parallel light between the third parabolic mirror and the fourth parabolic mirror. The illumination optical system for a two-plate projector according to claim 4, wherein

前記第１光路光学系は、前記入射位置から入射する照明光を平行光に変換する第１レンズと、該第１レンズを経た照明光を反射させる第１ミラーと、該第１ミラーを経た照明光を収束光として前記出射位置に導く第２レンズとを有し、前記第１レンズと前記第２レンズとの間の平行光の光路中に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、前記入射位置から入射する照明光を平行光に変換する第３レンズと、該第３レンズを経た照明光を反射させる第２ミラーと、該第２ミラーを経た照明光を収束光として前記出射位置に導く第４レンズとを有し、前記第３レンズと前記第４レンズとの間の平行光の光路中に前記第２波長領域選択素子を配置した、ことを特徴とする請求項４に記載の２板式投影装置用照明光学系。 The first optical path optical system includes a first lens that converts illumination light incident from the incident position into parallel light, a first mirror that reflects illumination light that has passed through the first lens, and illumination that has passed through the first mirror. A second lens for guiding light to the emission position as convergent light, and arranging the first wavelength region selection element in an optical path of parallel light between the first lens and the second lens,
The second optical path optical system includes a third lens that converts illumination light incident from the incident position into parallel light, a second mirror that reflects illumination light that has passed through the third lens, and illumination that has passed through the second mirror. A fourth lens that guides light to the emission position as convergent light, and the second wavelength region selection element is disposed in the optical path of parallel light between the third lens and the fourth lens. The illumination optical system for a two-plate projector according to claim 4,

前記第１光路光学系は、前記入射位置から入射する照明光を反射させて収束光として前記出射位置に導く第１楕円ミラーを有し、該第１楕円ミラーの入射側または出射側に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、前記入射位置から入射する照明光を反射させて収束光として前記出射位置に導く第２楕円ミラーを有し、該第２楕円ミラーの入射側または出射側に前記第２波長領域選択素子を配置した、ことを特徴とする請求項４に記載の２板式投影装置用照明光学系。 The first optical path optical system includes a first elliptical mirror that reflects illumination light incident from the incident position and guides the illumination light as convergent light to the emission position, and the first optical path optical system includes the first elliptical mirror on the incident side or the emission side of the first elliptical mirror. One wavelength region selection element is arranged,
The second optical path optical system includes a second elliptical mirror that reflects illumination light incident from the incident position and guides the illumination light as convergent light to the emission position, and the second optical path optical system includes the second elliptical mirror on the incident side or the emission side of the second elliptical mirror. 5. The illumination optical system for a two-plate projector according to claim 4, wherein a two-wavelength region selection element is disposed.

前記第１光路光学系は、第１共通レンズおよび第３ミラーを有し、前記入射位置から入射する照明光を、前記第１共通レンズで平行光に変換した後、前記第３ミラーで反射させて前記第１共通レンズにより収束光として前記出射位置に導き、前記第３ミラーに対する入射側または出射側で、該第３ミラーと前記第１共通レンズとの間の平行光の光路中に前記第１波長領域選択素子を配置し、
前記第２光路光学系は、第２共通レンズおよび第４ミラーを有し、前記入射位置から入射する照明光を、前記第２共通レンズで平行光に変換した後、前記第４ミラーで反射させて前記第２共通レンズにより収束光として前記出射位置に導き、前記第４ミラーに対する入射側または出射側で、該第４ミラーと前記第２共通レンズとの間の平行光の光路中に前記第２波長領域選択素子を配置した、ことを特徴とする請求項４に記載の２板式投影装置用照明光学系。 The first optical path optical system includes a first common lens and a third mirror. The illumination light incident from the incident position is converted into parallel light by the first common lens, and then reflected by the third mirror. The first common lens guides the converged light to the exit position, and enters the parallel light path between the third mirror and the first common lens on the incident side or the exit side with respect to the third mirror. One wavelength region selection element is arranged,
The second optical path optical system includes a second common lens and a fourth mirror. The illumination light incident from the incident position is converted into parallel light by the second common lens and then reflected by the fourth mirror. Then, the second common lens guides the converged light to the exit position, and enters the parallel light path between the fourth mirror and the second common lens on the incident side or the exit side with respect to the fourth mirror. 5. The illumination optical system for a two-plate projector according to claim 4, wherein a two-wavelength region selection element is disposed.

前記光源部からの照明光を、前記入射位置で集光させるように構成した、ことを特徴とする請求項４乃至８のいずれか一項に記載の２板式投影装置用照明光学系。 The illumination optical system for a two-plate projector according to any one of claims 4 to 8, wherein illumination light from the light source unit is configured to be condensed at the incident position.

前記光源部からの照明光を、前記入射位置および前記出射位置でそれぞれ集光させるように構成した、ことを特徴とする請求項５乃至８のいずれか一項に記載の２板式投影装置用照明光学系。 The illumination for a two-plate projector according to any one of claims 5 to 8, wherein the illumination light from the light source unit is condensed at the incident position and the emission position, respectively. Optical system.