JP2012256075A5

JP2012256075A5 -

Info

Publication number: JP2012256075A5
Application number: JP2012205019
Authority: JP
Publication date: 2013-02-14
Anticipated expiration: 2023-12-08

Description

The present invention has been made in view of the above-described circumstances, and employs an imaging optical system including a reflecting surface in order to reduce the projection space outside the projection apparatus while increasing the size of the projection screen. However, it is an object of the present invention to provide a projection optical system that can correct chromatic aberration and can project a large screen.

That is, the projection optical system according to claim 1 has "first and second optical systems arranged in the first and second order from the light valve side on the projection side of the light valve. The optical system includes a refractive optical system composed of a plurality of lenses that are not decentered from each other and has a positive power, and the second optical system includes a reflecting surface having a positive power and has a positive power. and, wherein an image formed by the light valve is imaged as an intermediate image on the optical path, and reflects the light beam after formed as the intermediate image by the reflecting surface, projected on the projection plane as a final image, the The imaging light beam generated from the center of the image formed on the light valve is viewed in a plane parallel to the cross section including the imaging light beam from the light valve to the final image. Between the reflecting surface having a positive power and the final image, Crosses the optical axis coincident with said plurality of lenses in until the last surface of the second optical system from Tobarubu incident approximately the center of the final image "be characterized.

The projection optical system according to claim 2 has "first and second optical systems arranged in the order of first and second from the light valve side on the projection side of the light valve. The optical system includes a refractive optical system composed of a plurality of lenses that are not decentered from each other and has a positive power, and the second optical system includes a reflecting surface having a positive power and has a positive power. the images formed by the light valve is imaged as an intermediate image on the optical path, and reflects the light beam after formed as the intermediate image by the reflecting surface, projected on the projection plane as a final image, the light The first light beam generated from the center of the image formed on the bulb is reflected on the reflection surface having the positive power and viewed from a plane parallel to the cross section including the first and second image light beams. Between the optical system and the reflecting surface having the positive power and the final image. The projection optical system is characterized in that it intersects the optical axes that coincide with each other in the plurality of lenses between the light valve and the final surface of the second optical system, and is incident on the approximate center of the final image. .
According to a third aspect of the present invention, there is provided a projection optical system comprising: a first and a second optical system disposed in order of first and second from the light valve side on the projection side of the light valve; The optical system includes a refractive optical system composed of a plurality of lenses that are not decentered from each other, has a positive power, and the second optical system is connected to the projection side of the light valve from the light valve side. An image formed on the light path as an intermediate image on the light path by sequentially including a first reflection surface and a second reflection surface having a positive power in order, The imaged light beam after being imaged is reflected by the reflecting surface and projected onto the projection surface as a final image, and the imaged light beam generated from the center of the image formed on the light valve is reflected by the first reflecting surface. Viewed from a plane parallel to the cross section including the imaging light flux before and after being formed. In the optical system, the second axis as viewed from a plane parallel to the cross section including the imaging light flux before and after being reflected by the second reflecting surface and intersecting the optical axis coincident with the plurality of lenses. Between the reflecting surface and the final image, it intersects the optical axis that coincides with the plurality of lenses between the light valve and the final surface of the second optical system, and is incident on the approximate center of the final image. It is characterized by that.
The shape of the intermediate image can be “a shape that reduces the trapezoidal distortion of the final image” and is configured to “form an intermediate image with a shape distorted in reverse to the trapezoidal distortion of the final image” Can do. The intermediate image can have a shape of “the side with the largest incident angle on the projection surface is the shortest”.

In the "image projection apparatus that irradiates the light bulb for image formation with illumination light from the light source and enlarges and projects the image formed on the light valve by the projection optical system", the image formed on the light valve is enlarged and projected. The projection optical system according to claim 1, 2 or 3 can be used .

The projection optical system according to the present invention has first and second optical systems arranged in the first and second order from the light valve side on the projection side of the light valve, and the first optical system. Includes a refractive optical system composed of a plurality of lenses that are not decentered from each other, has a positive power, and the second optical system includes a reflecting surface having a positive power, has a positive power, and The image formed by the light valve is formed as an intermediate image on the optical path, and the intermediate image is further magnified by reflecting the light beam formed as the intermediate image on the reflecting surface, and the projection is performed as the final image. Since the projection is performed on the surface, a large projection magnification can be realized, and the first optical system is composed of a plurality of lenses. Therefore, even when a color synthesis prism is used, chromatic aberration correction can be performed using chromatic dispersion characteristics. The optical path of the imaging light beam is included in the second optical system Because folded back by the reflecting surface can be made compact.

Claims

A projection optical system for enlarging and projecting an image formed on a light valve onto a projection surface,
On the projection side of the light valve, it has first and second optical systems arranged in the first and second order from the light valve side,
The first optical system includes a refractive optical system composed of a plurality of lenses that are not decentered from each other, and has a positive power,
The second optical system includes a reflecting surface having a positive power, and has a positive power;
The image formed by the light valve is imaged as an intermediate image on the optical path , the light beam after being imaged as the intermediate image is reflected by the reflecting surface, and projected onto the projection surface as a final image,
The imaging light beam generated from the center of the image formed on the light valve is viewed in a plane parallel to the cross section including the imaging light beam from the light valve to the final image. The final image intersects the optical axis that coincides with the plurality of lenses between the light valve and the final surface of the second optical system between the positive power reflecting surface and the final image. A projection optical system characterized by being incident at approximately the center of the projection optical system.
A projection optical system for enlarging and projecting an image formed on a light valve onto a projection surface,
On the projection side of the light valve, it has first and second optical systems arranged in the first and second order from the light valve side,
The first optical system includes a refractive optical system composed of a plurality of lenses that are not decentered from each other, and has a positive power,
The second optical system includes a reflecting surface having a positive power, and has a positive power;
The image formed by the light valve is imaged as an intermediate image on the optical path , the light beam after being imaged as the intermediate image is reflected by the reflecting surface, and projected onto the projection surface as a final image,
The imaging light beam generated from the center of the image formed on the light valve is viewed from a plane parallel to the cross section including the imaging light beam before and after being reflected by the reflecting surface having the positive power. An optical axis that coincides with the plurality of lenses in the first optical system and between the reflection surface having the positive power and the final image between the light valve and the final surface of the second optical system; A projection optical system that intersects and enters approximately the center of the final image.
A projection optical system for enlarging and projecting an image formed on a light valve onto a projection surface,
  On the projection side of the light valve, it has first and second optical systems arranged in the first and second order from the light valve side,
  The first optical system includes a refractive optical system composed of a plurality of lenses that are not decentered from each other, and has a positive power,
  The second optical system includes a first reflecting surface and a second reflecting surface having a positive power in this order from the light valve side to the projection side of the light valve, and has a positive power.
  The image formed on the light valve is formed as an intermediate image on the optical path, the light beam after being formed as the intermediate image is reflected by the reflecting surface, and projected onto the projection surface as a final image,
An image forming light beam generated from the center of the image formed on the light valve is viewed from a plane parallel to a cross section including the image forming light beam before and after being reflected by the first reflecting surface. In the optical system, the second reflection as seen from a plane parallel to the cross section including the imaging light flux before and after being reflected by the second reflecting surface and intersecting the optical axis coincident with the plurality of lenses. Crossing the optical axis coincident with the plurality of lenses between the light valve and the final surface of the second optical system between the surface and the final image, and is incident on approximately the center of the final image Projection optical system.