Fixed focus lens and imaging system
First Claim
1. A fixed-focus lens capable of imaging a light valve disposed at a reduced side onto a magnified side comprising:
- a first lens group, disposed in the light path between the reduced side and the magnified side,a second lens group, disposed in the light path between the first lens group and the magnified side and comprising a first free form lens and an aspherical lens, the aspherical lens being disposed in the light path between the first lens group and the first free form lens, wherein the aspherical lens and the first free form lens both have negative refractive power, anda free form reflective mirror, disposed in the light path between the second lens group and the magnified side, wherein the free form reflective mirror is a convex mirror, and wherein an imaging surface imaged from the light valve by the fixed-focus lens in the magnified side is a curved surface.
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Accused Products
Abstract
A fixed-focus lens capable of imaging a light valve disposed at a reduced side onto a magnified side is provided. The fixed-focus lens includes a first lens group, a second lens group, and a free form reflective mirror. The first lens group is disposed in the light path between the reduced side and the magnified side. The second lens group is disposed in the light path between the first lens group and the magnified side and includes a first free form lens. The free form reflective mirror is disposed in the light path between the second lens group and the magnified side. An imaging surface imaged from the light valve by the fixed-focus lens is a curved surface. An imaging system using the fixed-focus lens is also provided.
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Citations
16 Claims
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1. A fixed-focus lens capable of imaging a light valve disposed at a reduced side onto a magnified side comprising:
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a first lens group, disposed in the light path between the reduced side and the magnified side, a second lens group, disposed in the light path between the first lens group and the magnified side and comprising a first free form lens and an aspherical lens, the aspherical lens being disposed in the light path between the first lens group and the first free form lens, wherein the aspherical lens and the first free form lens both have negative refractive power, and a free form reflective mirror, disposed in the light path between the second lens group and the magnified side, wherein the free form reflective mirror is a convex mirror, and wherein an imaging surface imaged from the light valve by the fixed-focus lens in the magnified side is a curved surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An imaging system, comprising:
a fixed-focus lens, capable of imaging a light valve disposed at a reduced side on to a magnified side comprising; a first lens group, disposed in the light path between the reduced side and the magnified side; a second lens group, disposed in the light path between the first lens group and the magnified side and comprising a first free form lens and an aspherical lens, the aspherical lens being disposed in the light path between the first lens group and the first free form lens, wherein the aspherical lens and the first free form lens both have negative refractive power; and a free form reflective mirror, disposed in the light path between the second lens group and the magnified side, wherein the free form reflective mirror is a convex mirror, and wherein an imaging surface imaged from the light valve by the fixed-focus lens in the magnified side is a curved surface; and a curved screen, disposed at the magnified side, wherein the imaging surface imaged from the light valve by the fixed-focus lens in the magnified side and the curved screen substantially coincide with each other. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
Specification