Projection type image display apparatus and projection optical system
First Claim
1. A projection type image display apparatus comprising:
- a light source;
an illumination optical system that uniformly illuminates beams, which are emitted from the light source, on a surface of an image modulation element as a primary image plane; and
a projection optical system that projects image information of the primary image plane modulated by the image modulation element on a screen as a secondary image plane in an enlarged manner,wherein the projection optical system includesa first optical system that has a positive refractive power and includes a plurality of transmissive surfaces, anda second optical system that has a positive refractive power and includes a concave reflective surface,wherein the first optical system hasa first reflective surface disposed between any surfaces of the plurality of transmissive surfaces, anda second reflective surface disposed between the first optical system and second optical system, andwherein assuming that an optical axis is a z axis, a y-axis rotation angle of the first reflective surface is β
1, and a y-axis rotation angle of the second reflective surface is β
2, the following conditional expressions are satisfied
20°
<
|β
1|<
45°
(1)
20°
<
|β
2|<
45°
(2).
1 Assignment
0 Petitions
Accused Products
Abstract
A projection type image display apparatus includes: a light source; an illumination optical system that uniformly illuminates beams, which are emitted from the light source, on a surface of an image modulation element as a primary image plane; and a projection optical system that projects image information of the primary image plane modulated by the image modulation element on a screen as a secondary image plane in an enlarged manner. The projection optical system includes a first optical system having a positive refractive power and including a plurality of transmissive surfaces, and a second optical system having a positive refractive power and including a concave reflective surface. The first optical system has a first reflective surface disposed between any surfaces of the plurality of transmissive surfaces, and a second reflective surface disposed between the first optical system and second optical system.
23 Citations
6 Claims
-
1. A projection type image display apparatus comprising:
-
a light source; an illumination optical system that uniformly illuminates beams, which are emitted from the light source, on a surface of an image modulation element as a primary image plane; and a projection optical system that projects image information of the primary image plane modulated by the image modulation element on a screen as a secondary image plane in an enlarged manner, wherein the projection optical system includes a first optical system that has a positive refractive power and includes a plurality of transmissive surfaces, and a second optical system that has a positive refractive power and includes a concave reflective surface, wherein the first optical system has a first reflective surface disposed between any surfaces of the plurality of transmissive surfaces, and a second reflective surface disposed between the first optical system and second optical system, and wherein assuming that an optical axis is a z axis, a y-axis rotation angle of the first reflective surface is β
1, and a y-axis rotation angle of the second reflective surface is β
2, the following conditional expressions are satisfied
20°
<
|β
1|<
45°
(1)
20°
<
|β
2|<
45°
(2). - View Dependent Claims (2, 3, 5)
-
-
4. A projection type image display apparatus comprising:
-
a light source; an illumination optical system that uniformly illuminates beams, which are emitted from the light source, on a surface of an image modulation element as a primary image plane; and a projection optical system that projects image information of the primary image plane modulated by the image modulation element on a screen as a secondary image plane in an enlarged manner, wherein the projection optical system includes a first optical system that has a positive refractive power and includes a plurality of transmissive surfaces, and a second optical system that has a positive refractive power and includes a concave reflective surface, wherein the first optical system has a first reflective surface disposed between any surfaces of the plurality of transmissive surfaces, and a second reflective surface disposed between the first optical system and second optical system, and wherein assuming that an optical axis is a z axis, a y-axis rotation angle of the first reflective surface is β
1, a y-axis rotation angle of the second reflective surface is β
2, an x-axis rotation angle of the first reflective surface is α
1, and an x-axis rotation angle of the second reflective surface is α
2, the following conditional expressions are satisfied
20°
<
|β
1|<
45°
(1)
20°
<
|β
2|<
45°
(2)
3°
<
|α
1|<
20°
(3)
3°
<
|α
2|<
20°
(4)
−
10°
<
α
1+α
2<
10°
(5)
−
10°
<
β
1+β
2<
10°
(6).
-
-
6. A projection optical system comprising:
-
a first optical system that has a positive refractive power and includes a plurality of transmissive surfaces, and a second optical system that has a positive refractive power and includes a concave reflective surface, wherein the projection optical system is configured to project an image in an enlarged manner from a primary image plane on a reduction side to a secondary image plane on a magnification side, wherein the first optical system has a first reflective surface disposed between any surfaces of the plurality of transmissive surfaces, and a second reflective surface disposed between the first optical system and second optical system, and wherein assuming that an optical axis is a z axis, a y-axis rotation angle of the first reflective surface is β
1, a y-axis rotation angle of the second reflective surface is β
2, an x-axis rotation angle of the first reflective surface is α
1, and an x-axis rotation angle of the second reflective surface is α
2, the following conditional expressions are satisfied
20°
<
|β
1|<
45°
(1)
20°
<
|β
2|<
45°
(2)
3°
<
|α
1|<
20°
(3)
3°
<
|α
2|<
20°
(4)
−
10°
<
α
1+α
2<
10°
(5)
−
10°
<
β
1+β
2<
10°
(6).
-
Specification