Patent ID: 9261670
Filing Date: 2016-02-16
CPC Classification: G02B

Claim Text:
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.