Projection lens assembly
AssigneeZhejiang Sunny Optical Co., Ltd
InventorLin Huang
Life of this patent
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Abstract
The present disclosure discloses a projection lens assembly. The projection lens assembly includes, sequentially from an image-source side to an image side along an optical axis, a first lens having a positive refractive power; and a second lens having a positive refractive power. At least one of the first lens or the second lens is a glass lens. A total effective focal length f of the projection lens assembly and an effective focal length f2 of the second lens satisfy: 1<f/f2<1.5.
Claims14
A projection lens assembly comprising, sequentially from an image-source side to an image side along an optical axis,
- a first lens having a positive refractive power;
- and
- a second lens having a positive refractive power,
- wherein at least one of the first lens or the second lens is a glass lens, and
- a total effective focal length f of the projection lens assembly and an effective focal length f2 of the second lens satisfy:
- 1<f/f2<1.5,
- wherein a radius of curvature R1 of an image-source-side surface of the first lens and a radius of curvature R4 of an image-side surface of the second lens satisfy:
- −1.2<R1/R4<−0.8, and
- wherein an effective semi-diameter DT11 of the image-source-side surface of the first lens and an effective semi-diameter DT22 of the image-side surface of the second lens satisfy:
- 0.7<DT11/DT22<1.
A projection lens assembly comprising, sequentially from an image-source side to an image side along an optical axis,
- a first lens having a positive refractive power;
- and
- a second lens having a positive refractive power,
- wherein at least one of the first lens or the second lens is a glass lens, and
- a total effective focal length f of the projection lens assembly, an effective focal length f1 of the first lens, and an effective focal length f2 of the second lens satisfy:
- 0.5<f/(f1+f2)<0.8,
- wherein a radius of curvature R1 of an image-source-side surface of the first lens and a radius of curvature R4 of an image-side surface of the second lens satisfy:
- −1.2<R1/R4<−0.8, and
- wherein an effective semi-diameter DT11 of the image-source-side surface of the first lens and an effective semi-diameter DT22 of the image-side surface of the second lens satisfy:
- 0.7<DT11/DT22<1.
Dependencies are inferred from the claim text.