IMAGING LENS
First Claim
Patent Images
1. An imaging lens comprising:
- a first lens group; and
a second lens group, arranged in this order from an object side to an image plane side,wherein said first lens group includes a first lens, a second lens, and a third lens having negative refractive power,said second lens group includes a fourth lens, a fifth lens, and a sixth lens,said third lens has a concave surface facing the image plane side near an optical axis thereof,said fifth lens has a concave surface facing the image plane side near an optical axis thereof, andsaid fourth lens has an Abbe'"'"'s number ν
d4 and said fifth lens has an Abbe'"'"'s number ν
d5 so that the following conditional expressions are satisfied;
15<
ν
d4<
35,
40<
ν
d5<
75.
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Accused Products
Abstract
An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens having negative refractive power. The second lens group includes a fourth lens, a fifth lens, and a sixth lens. The third lens has a concave surface facing the image plane side near an optical axis thereof. The fifth lens has a concave surface facing the image plane side near an optical axis thereof. The fourth lens has a specific Abbe'"'"'s number. The fifth lens has a specific Abbe'"'"'s number.
15 Citations
14 Claims
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1. An imaging lens comprising:
-
a first lens group; and a second lens group, arranged in this order from an object side to an image plane side, wherein said first lens group includes a first lens, a second lens, and a third lens having negative refractive power, said second lens group includes a fourth lens, a fifth lens, and a sixth lens, said third lens has a concave surface facing the image plane side near an optical axis thereof, said fifth lens has a concave surface facing the image plane side near an optical axis thereof, and said fourth lens has an Abbe'"'"'s number ν
d4 and said fifth lens has an Abbe'"'"'s number ν
d5 so that the following conditional expressions are satisfied;
15<
ν
d4<
35,
40<
ν
d5<
75. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification