| 摘要 |
A projection lens disposed between an enlarged side and a reduced side is provided. The projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, which are sequentially arranged from the enlarged side to the reduced side. Refractive powers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively negative, positive, positive, negative, positive and positive. A focal length of the third lens is greater than or equal to 20 mm and is less than or equal to 200 mm. An optical engine is also provided. |
| 主权项 |
1. A projection lens disposed between an enlarged side and a reduced side, the projection lens comprising:
a first lens disposed between the enlarged side and the reduced side, the first lens having a negative refractive power; a second lens disposed between the first lens and the reduced side, the second lens having a positive refractive power; a third lens disposed between the second lens and the reduced side, the third lens having a positive refractive power, wherein a focal length of the third lens is greater than or equal to 20 mm and is less than or equal to 200 mm; a fourth lens disposed between the third lens and the reduced side, the fourth lens having a negative refractive power; a fifth lens disposed between the fourth lens and the reduced side, the fifth lens having a positive refractive power; and a sixth lens disposed between the fifth lens and the reduced side, the sixth lens having a positive refractive power, wherein the first lens and the third lens are aspherical lenses. |
