Compact image pickup lens
A compact image pickup lens includes, in order from an object side to an image side, a first lens element G 1 of positive refractive power, a second lens element G 2 of positive refractive power, and a third lens element G 3 of negative refractive power. The first lens element has a meniscus shape with its convex surface L 1 on the object side. The second lens element also has a meniscus shape but with its convex surface L 4 on the image side. Each of the first, second and third lens elements has at least one aspheric surface. An aperture STO is further positioned in front of the second lens element. The image pickup lens satisfies the following conditions: 0.85≦(v 1 /v 2 )≦1.15 and 0.85≦(v 2 /v 3 )≦1.25, where v 1 is the Abbe number at the d-line (587.5618 nm) of the first lens element, v 2 is the Abbe number at the d-line (587.5618 nm) of the second lens element, and v 3 is the Abbe number at the d-line (587.5618 nm) of the third lens element.
1. An image pickup lens, in order from an object side to an image side along an optical axis thereof, comprising:
a first lens element of positive refractive power, the first lens element having a meniscus shape and an object-side surface convex toward the object side;
a second lens element of positive refractive power, the second lens element having a meniscus shape and an image-side surface convex toward the image side; and
a third lens element of negative refractive power, the third lens element having an aspheric surface on the image side;
wherein, the first, second and third lens elements satisfy the following conditions:
0.85
≤
v
1
v
2
≤
1.15
0.85
≤
v
2
v
3
≤
1.25
where, v 1 represents the Abbe number at the d-line of the first lens element, v 2 represents the Abbe number at the d-line of the second lens element, and v 3 represents the Abbe number at the d-line of the third lens element; the wavelength at the d-line being 587.5618 nm; and
wherein the first and second lens elements have the same Abbe number at the d-line.
2. The image pickup lens as claimed in claim 1 , wherein the third lens element has a negative on-axis refractive power and a positive peripheral refractive power.
3. The image pickup lens as claimed in claim 2 , wherein each of the first and second lens elements has at least one aspheric surface.
4. The image pickup lens as claimed in claim 2 , further comprising an aperture positioned in front of the second lens element.
5. The image pickup lens as claimed in claim 4 , wherein each of the first and second lens elements has at least one aspheric surface.
6. The image pickup lens as claimed in claim 1 , further comprising an aperture positioned in front of the second lens element.
7. The image pickup lens as claimed in claim 6 , wherein each of the first and second lens elements has at least one aspheric surface.
8. The image pickup lens as claimed in claim 1 , wherein each of the first and second lens elements has at least one aspheric surface.
9. An image pickup lens, in order from an object side to an image side along an optical axis thereof, comprising:
a first lens element of positive refractive power, the first lens element having a meniscus shape and an object-side surface convex toward the object side;
a second lens element of positive refractive power, the second lens element having a meniscus shape and an image-side surface convex toward the image side;
an aperture positioned between the first and second lens elements; and
a third lens element of negative refractive power, the third lens element having an aspheric surface on the image side;
wherein, the first, second and third lens elements satisfy the following conditions:
0.85
≤
v
1
v
2
≤
1.15
0.85
≤
v
2
v
3
≤
1.25
where, v 1 represents the Abbe number at the d-line of the first lens element, v 2 represents the Abbe number at the d-line of the second lens element, and v 3 represents the Abbe number at the d-line of the third lens element; the wavelength at the d-line being 587.5618 nm; and
wherein the first and second lens elements have the same Abbe number at the d-line.
10. The image pickup lens as claimed in claim 9 , wherein the third lens element has a negative on-axis refractive power and a positive peripheral refractive power.
11. The image pickup lens as claimed in claim 10 , wherein each of the first and second lens elements has at least one aspheric surface.
12. The image pickup lens as claimed in claim 9 , wherein each of the first and second lens elements has at least one aspheric surface.
13. An image pickup lens, in order from an object side to an image side along an optical axis thereof, comprising:
a first lens element of positive refractive power, the first lens element having a meniscus shape and an object-side surface convex toward the object side;
a second lens element of positive refractive power, the second lens element having a meniscus shape and an image-side surface convex toward the image side; and
a third lens element of negative refractive power, the third lens element having an aspheric surface on the image side, and having a negative on-axis refractive power and a positive peripheral refractive power;
wherein, the first, second and third lens elements satisfy the following conditions:
0.85
≤
v
1
v
2
≤
1.15
0.85
≤
v
2
v
3
≤
1.25
where, v 1 represents the Abbe number at the d-line of the first lens element, v 2 represents the Abbe number at the d-line of the second lens element, and v 3 represents the Abbe number at the d-line of the third lens element; the wavelength at the d-line being 587.5618 nm; and
wherein the first and second lens elements have the same Abbe number at the d-line.
14. The image pickup lens as claimed in claim 13 , further comprising an aperture positioned in front of the second lens element.
15. The image pickup lens as claimed in claim 14 , wherein each of the first and second lens elements has at least one aspheric surface.
16. The image pickup lens as claimed in claim 13 ,wherein each of the first and second lens elements has at least one aspheric surface.
17. The image pickup lens as claimed in claim 1 , wherein the first, second and third lens elements have the same Abbe number at the d-line.
18. The image pickup lens as claimed in claim 9 , wherein the first, second and third lens elements have the same Abbe number at the d-line.
19. The image pickup lens as claimed in claim 13 , wherein the first, second and third lens elements have the same Abbe number at the d-line.