| 摘要 |
A fixed-focus lens including a first lens group and a second lens group is provided. The first lens group having a negative refractive power includes a first lens, a second lens and a third lens arranged in sequence from an object side to an image side, in which refractive powers of the first, second and third lenses are negative, negative and positive in sequence. The second lens group having a positive refractive power is located between the first lens group and the image side, and the second lens group includes a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side, in which refractive powers of the fourth, fifth and sixth lenses are positive, negative and positive in sequence. The first, second, third, fourth, fifth and sixth lenses are separated from each other. |
| 主权项 |
1. A fixed-focus lens, comprising:
a first lens group having a negative refractive power, the first lens group comprising a first lens, a second lens and a third lens arranged in sequence from an object side to an image side, and refractive powers of the first lens, the second lens and the third lens being negative, negative and positive in sequence; and a second lens group having a positive refractive power, disposed between the first lens group and the image side, the second lens group comprising a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side, and refractive powers of the fourth lens, the fifth lens and the sixth lens being positive, negative and positive in sequence, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are separated from each other, and an Abbe number of the fourth lens is greater than 70. |
