Projection lens assembly
AssigneeZhejiang Sunny Optical Co., Ltd
InventorsLin HUANG, Litong SONG
Life of this patent
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Abstract
The present disclosure discloses a projection lens assembly. The projection lens assembly includes, sequentially along an optical axis from an image side to a source side, a first lens, a second lens, a third lens, and a fourth lens. The first lens has a positive refractive power, and an image-side surface of the first lens is a convex surface. The second lens has a positive refractive power or a negative refractive power, and a source-side surface of the second lens is a convex surface. The third lens has a positive refractive power. The fourth lens has a positive refractive power or a negative refractive power.
Claims19
A projection lens assembly comprising, sequentially along an optical axis from an image side to a source side, a first lens, a second lens, a third lens, and a fourth lens, wherein
- the first lens has a positive refractive power, and an image-side surface of the first lens is a convex surface;
- the second lens has a positive refractive power or a negative refractive power, and a source-side surface of the second lens is a convex surface;
- the third lens has a positive refractive power;
- and
- the fourth lens has a positive refractive power or a negative refractive power.
A projection lens assembly comprising, sequentially along an optical axis from an image side to a source side, a first lens, a second lens, a third lens, and a fourth lens, wherein
- the first lens has a positive refractive power, and an image-side surface of the first lens is a convex surface;
- the second lens has a positive refractive power or a negative refractive power, and a source-side surface of the second lens is a convex surface;
- the third lens has a positive refractive power;
- the fourth lens has a positive refractive power or a negative refractive power;
- and
- an effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy:
- 2.0<|f1/f2|<2.8.
Dependencies are inferred from the claim text.