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US 11,899,170 B2Granted
Optical lens and projection apparatus
AssigneeYoung Optics Inc.
InventorsYu-Chen Lin, Chun-Tung Wu
Life of this patent
Estimating the term…
Abstract
An optical lens includes a first lens with a positive refractive power, a second lens having a diffractive optical surface and a negative refractive power, and a third lens with a positive refractive power arranged in order from a magnified side to a minified side. A total number of lenses with refractive powers in the optical lens is smaller than six, and the first lens, the second lens and the third lens are made of plastic.
Claims16
A projection lens, comprising:
- a first lens with a positive refractive power, a second lens having a diffractive optical surface and a negative refractive power, and a third lens with a positive refractive power arranged in order from a magnified side to a minified side, a total number of lenses with refractive powers in the projection lens being smaller than six, and the first lens, the second lens and the third lens of the projection lens being aspheric lenses and made of plastic.
A projection apparatus, comprising:
- a light source;
- a light valve disposed downstream from and in a light path of the light source;
- and
- an optical lens disposed downstream from and in a light path of the light valve, the optical lens comprising a first lens with a positive refractive power, a second lens having a diffractive optical surface and a negative refractive power, and a third lens with a positive refractive power arranged in order from a magnified side to a minified side, a total number of lenses with refractive powers in the optical lens being smaller than six, and the first lens, the second lens and the third lens being aspheric lenses and made of plastic.
1 more element
A projection apparatus, comprising:
- a light source;
- a light valve disposed downstream from and in a light path of the light source;
- and
- an optical lens disposed downstream from and in a light path of the light valve, the optical lens consisting essentially of a first lens, a second lens, and a third lens arranged in order in a direction, the second lens having at least one diffractive optical surface, the first lens, the second lens and the third lens being aspheric lenses and made of plastic, and a total number of lenses with refractive powers in the optical lens being smaller than six, wherein a depth of the at least one diffractive optical surface is in the range of 0.29 um-2.5 um, and the projection apparatus is configured for projecting a real image.
1 more element
Dependencies are inferred from the claim text.