Wide-angle lens assembly
A wide-angle lens assembly includes, in order from an object side to an image side along an optical axis, a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with positive refractive power; wherein, the wide-angle lens assembly satisfies the following condition: 0.2<f/f7<0.5; where f is a focal length of the wide-angle lens assembly and f7 is a focal length of the seventh lens. With the aforementioned design, the wide-angle lens assembly can have a large FOV and an improved imaging quality.
1. A wide-angle lens assembly, in order from an object side to an image side along an optical axis, comprising:
a first lens with negative refractive power;
a second lens with negative refractive power;
a third lens with positive refractive power;
a fourth lens with positive refractive power;
a fifth lens with positive refractive power;
a sixth lens with negative refractive power; and
a seventh lens with positive refractive power; wherein, the wide-angle lens assembly satisfies the following condition:
0.2< f/f 7<0.5;
where f is a focal length of the wide-angle lens assembly and f7 is a focal length of the seventh lens.
2. The wide-angle lens assembly as claimed in claim 1 , wherein the fifth lens is adhered to the sixth lens to form a doublet.
3. The wide-angle lens assembly as claimed in claim 1 , wherein the wide-angle lens assembly further satisfies the following condition:
−0.9< f/f 6<−0.4;
where f6 is the focal length of the sixth lens.
4. The wide-angle lens assembly as claimed in claim 1 , wherein the wide-angle lens assembly further satisfies the following condition:
Vd 4>60;
where Vd4 is an Abbe number of the fourth lens.
5. The wide-angle lens assembly as claimed in claim 1 , wherein the wide-angle lens assembly further satisfies the following condition:
4<( f 1+ f 2+ f 3+ f 4+ f 5+ f 6+ f 7)/ f< 6;
where f1 is a focal length of the first lens; f2 is a focal length of the second lens; f3 is a focal length of the third lens; f4 is a focal length of the fourth lens; f5 is a focal length of the fifth lens; f6 is a focal length of the sixth lens.
6. The wide-angle lens assembly as claimed in claim 1 , wherein the wide-angle lens assembly further satisfies the following condition:
3<( R 1/ R 2)<6;
where R 1 is an R value of an object-side surface of the first lens; R 2 is an R value of an image side of the first lens.
7. The wide-angle lens assembly as claimed in claim 1 , wherein at least one surface of the second lens is aspheric.
8. The wide-angle lens assembly as claimed in claim 1 , wherein at least one surface of the fourth lens is aspheric.
9. The wide-angle lens assembly as claimed in claim 1 , wherein at least one surface of the seventh lens is aspheric.
10. The wide-angle lens assembly of claim 1 , wherein the seventh lens is of a meniscus shape having an object side surface being convex and an image side surface being concave.