JP2003156683A5

JP2003156683A5 -

Info

Publication number: JP2003156683A5
Application number: JP2002246483A
Authority: JP
Filing date: 2002-08-27
Publication date: 2005-03-10
Anticipated expiration: 2022-08-27

Description

【００１３】
このために本発明は、分離された色光の各々に対応して備えられ、これらの分離された色光の各々を駆動電圧により光変調し、映像色光として形成する横長な矩形の画像形成素子と、この画像形成素子から出力される映像色光としての光を合成する光合成素子と、これらの光合成素子により合成された光が入射される第２レンズ群と、この第２レンズ群を通過した光が絞りを介して入射される第１Ｂレンズ群と、横長な矩形形状に形成され、第１Ｂレンズ群を通過した光について、その短辺方向に沿って所定角度を成して上向きに反射させて出射するようにされた光路変換手段と、この光路変換手段から入射された光を透過してスクリーンに対して投射するようにして設けられ、画像形成素子の短辺方向に対応して有効光線外とされる部分がカットされた形状のレンズを有する第１Ａレンズ群とを備え、第２レンズ群、第１Ｂレンズ群および第１Ａレンズ群の組み合わせにより全体として正の屈折力を有するレンズと負の屈折力を有するレンズが組み合わされたレトロフォーカスタイプとなるようにして、投射レンズを構成することとした。 0013
To this end, the present invention is provided with a horizontally long rectangular image forming element corresponding to each of the separated colored lights and photomodulating each of the separated colored lights with a driving voltage to form an image colored light. A photosynthetic element that synthesizes light as image color light output from this image forming element, a second lens group into which the light synthesized by these photosynthetic elements is incident, and light that has passed through the second lens group are narrowed down. The first B lens group incident through the lens and the light formed in a horizontally long rectangular shape and passing through the first B lens group are reflected upward at a predetermined angle along the short side direction and emitted. The optical path conversion means is provided so as to transmit the light incident from the optical path conversion means and project it onto the screen, and is considered to be out of the effective light beam corresponding to the short side direction of the image forming element. It is provided with a first A lens group having a lens having a cut shape, and a lens having a positive refractive force as a whole and a negative refractive force due to the combination of the second lens group, the first B lens group and the first A lens group. It was decided to configure the projection lens so that it would be a retrofocus type in which the lenses having the above were combined.

【００１４】
また、光源と、この光源からの光を複数の色光に分離する光分離手段と、この光分離手段により分離された色光の各々に対応して備えられ、これら分離された色光の各々を駆動電圧により光変調し、映像色光として形成する横長な矩形の画像形成素子と、これら画像形成素子から出力される映像色光としての光を合成する光合成素子と、これら光合成素子により合成された光が入射される第２レンズ群と、この第２レンズ群を通過した光が絞りを介して入射される第１Ｂレンズ群と、横長な矩形形状に形成され、第１Ｂレンズ群を通過した光について、その短辺方向に沿って所定角度を成して上向きに反射させて出射するようにされた光路変換手段と、この光路変換手段から入射された光を透過してスクリーンに対して投射するようにして設けられ、画像形成素子の短辺方向に対応して有効光線外とされる部分がカットされた形状のレンズを有する第１Ａレンズ群と、この第１Ａレンズ群により投射された画像を表示するスクリーンとを備え、第２レンズ群、第１Ｂレンズ群および第１Ａレンズ群の組み合わせから成るレンズ系としては、全体として正の屈折力を有するレンズと負の屈折力を有するレンズが組み合わされたレトロフォーカスタイプとされるようにして、プロジェクション表示装置を構成することとした。 0014.
Further, a light source, a light separating means for separating the light from the light source into a plurality of colored lights, and the colored light separated by the light separating means are provided corresponding to each of the separated colored lights, and the driving voltage of each of the separated colored lights is provided. A horizontally long rectangular image forming element that is light-modulated and formed as image color light, a photosynthesis element that synthesizes light as image color light output from these image forming elements, and light synthesized by these photosynthesis elements are incident. The second lens group, the first B lens group in which the light passing through the second lens group is incident through the aperture, and the light formed into a horizontally long rectangular shape and passing through the first B lens group are short. An optical path conversion means that forms a predetermined angle along the side direction and reflects upward to emit light, and a light path conversion means that transmits light incident from the optical path conversion means and projects it onto a screen. A first A lens group having a lens having a shape in which a portion outside the effective light beam corresponding to the short side direction of the image forming element is cut, and a screen displaying an image projected by the first A lens group. As a lens system consisting of a combination of a second lens group, a first B lens group, and a first A lens group, a retrofocus type in which a lens having a positive refractive power and a lens having a negative refractive power as a whole are combined. It was decided to configure the projection display device so as to be.

【００１６】
上記各構成によれば、本発明の投射レンズ単体、又は、本発明のプロジェクション表示装置を構成する投射レンズとしては、その内部に光路変換手段を備えていることとなる。そして、このような投射レンズにつき、上記構成によるレンズ群と光路変換手段の配置とすることで、高画角であって、かつ長いバックフォーカスでありながらも短い投射距離が確保され、かつ、テレセントリック性が保たれる投射レンズを得ることが可能になる。 0016.
According to each of the above configurations, the projection lens of the present invention alone or the projection lens constituting the projection display device of the present invention is provided with an optical path conversion means inside thereof. By arranging the lens group and the optical path conversion means according to the above configuration for such a projection lens, a short projection distance can be secured while having a high angle of view and a long back focus, and telecentric. It is possible to obtain a projection lens that maintains its properties.

【００４９】
そして、本実施の形態としては、後述するように、前側の負の屈折力を持つレンズＬ２に相当する第１レンズ群０において、負の屈折力を有する第１Ａレンズ群１００と、正の屈折力を有する第１Ｂレンズ群２００の間隔を広く取ると共に、バランスのよい屈折力配分とすることで、投射レンズ２０内における光路変換を可能とするだけの広い空間が得られるようにしているものである。[0049]
Then, as the present embodiment, as will be described later, in the first lens group 0 corresponding to the lens L2 having a negative refractive power on the front side, the first A lens group 100 having a negative refractive power and the positive refraction By widening the distance between the first B lens group 200 having power and by providing a well- balanced refractive power distribution, it is possible to obtain a wide space that enables optical path conversion in the projection lens 20. be.

【００６４】
また、図１３及び図１４に示す投射レンズ２０の構成によると、第１Ａレンズ群を形成するレンズ（１０１，１０２）については、その外形が、光路変換の方向（画像表示素子の短辺方向）の有効光線外部分がカットされた形状を有している。[0064]
Further, according to the configuration of the projection lens 20 shown in FIGS. 13 and 14, the outer shape of the lenses (101, 102) forming the first A lens group is the direction of optical path conversion (the short side direction of the image display element ). It has a shape in which the outer part of the effective light beam is cut.

Claims

A horizontally long rectangular image forming element provided corresponding to each of the separated color lights, and light-modulating each of the separated color lights with a drive voltage to form an image color light;
  A light combining element for combining the light as the image color light output from the image forming element;
  A second lens group into which light combined by the light combining element is incident;
  A first B lens group to which light having passed through the second lens group is incident through a stop;
  An optical path conversion means which is formed in a horizontal rectangular shape and is reflected upward at a predetermined angle along the short side direction of light which has passed through the first B lens group, and emitted;
  It is provided in such a manner that light incident from the light path conversion means is transmitted and projected onto the screen, and a portion cut out of the portion outside the effective light beam corresponding to the short side direction of the image forming element is cut. A first A lens group having a lens;
  And a lens having a positive refractive power as a whole and a lens having a negative refractive power are combined to be a retrofocus type by combining the second lens group, the first B lens group, and the first A lens group. ing,
  Projection lens characterized by

The focal length of the entire system is FL by the second lens group, the first B lens group and the first A lens group, the back focus from the image forming element to the forefront of the first A lens group is FB, and the front focal point of the second lens group The position is FFP2, the distance between the aperture stop and the second lens group is Dst, and the air conversion distance on the optical axis of the first A lens group and the first B lens group is D2.
      FB / FL> 2.2
      0.59 <| FFP2 / Dst | <0.96
      3.75 <D2 / FL
    The projection lens according to claim 1, satisfying the following conditional expression.

The projection lens according to claim 1, wherein the first B lens group is a cemented lens.

2. The projection lens according to claim 1, wherein the second lens unit includes, in order from the image forming element side, glass lenses of at least a positive lens, a positive lens, and a cemented lens.

The projection lens according to claim 1, wherein the second lens group is configured to include at least a positive lens, a cemented lens, and a glass lens of a positive lens in order of closest to the image forming element side.

The second lens group is characterized by including, in order from the screen side, a glass lens in the order of at least a cemented lens, a positive lens, a central air gap that is the widest in the second lens group, and a positive lens. The projection lens according to claim 1.

The second lens group is characterized by being provided with, from the screen side, at least a positive lens, a cemented lens, and a glass lens of a positive lens having the strongest refractive power in the second lens group. The projection lens described in.

The projection lens according to claim 1, wherein the aspheric lens in the second lens group is located closest to the screen.

The projection lens according to claim 1, wherein the aspheric lens in the second lens group is located closest to the image forming element.

The projection lens according to claim 1, wherein the aspheric lens in the second lens group is a biconcave lens having negative refractive power.

The optical path conversion means is configured to reflect the P-polarization component more strongly than the S-polarization component, or to reflect the S-polarization component more strongly than the P-polarization component. The projection lens described in.

Light source,
  Light separating means for separating light from the light source into a plurality of color lights;
  Provided for each of the color lights separated by the light separating means, each of the separated color lights A horizontally long rectangular image forming element which is light modulated by a drive voltage and formed as image color light;
  A light combining element for combining the light as the image color light output from the image forming element;
  A second lens group into which light combined by the light combining element is incident;
  A first B lens group to which light having passed through the second lens group is incident through a stop;
  An optical path conversion means which is formed in a horizontal rectangular shape and is reflected upward at a predetermined angle along the short side direction of light which has passed through the first B lens group, and emitted;
  It is provided in such a manner that light incident from the light path conversion means is transmitted and projected onto the screen, and a portion cut out of the portion outside the effective light beam corresponding to the short side direction of the image forming element is cut. A first A lens group having a lens;
  A screen for displaying an image projected by the first lens group A,
  A lens system consisting of a combination of the second lens group, the first B lens group, and the first A lens group is a retrofocus type in which a lens having positive refractive power and a lens having negative refractive power are combined as a whole. ing,
  A projection display apparatus characterized in that.

The focal length of the entire system is FL by the second lens group, the first B lens group and the first A lens group, the back focus from the image forming element to the forefront of the first A lens group is FB, and the front focal point of the second lens group The position is FFP2, the distance between the aperture stop and the second lens group is Dst, and the air conversion distance on the optical axis of the first A lens group and the first B lens group is D2.
      FB / FL> 2.2
      0.59 <| FFP2 / Dst | <0.96
      3.75 <D2 / FL
    The projection display apparatus according to claim 12, wherein the following conditional expression is satisfied.