IMAGE PICKUP LENS AND IMAGE PICKUP UNIT

• US 20140063323A1
• Filed: 07/18/2013
• Published: 03/06/2014
• Est. Priority Date: 08/28/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yamazaki, Takayuki, Nabeta, Kenshi
• Granted Patent: US 9,285,568 B2
• Time in Patent Office: Days
• US Class Current: 348/335
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/18 with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration G02B13/002 takes precedence

Abstract

An image pickup lens includes: in recited order from object plane toward image plane, a first lens having positive refractive power; a second lens having positive or negative refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power; a fifth lens having positive refractive power; and a sixth lens having negative refractive power and having optical surfaces, an image-sided surface of the optical surfaces having an aspherical shape with one or more inflection points other than an intersection point of the image-sided surface and an optical axis.

Claims

1. An image pickup lens comprising:

in recited order from object plane toward image plane,

a first lens having positive refractive power;

a second lens having positive or negative refractive power;

a third lens having negative refractive power;

a fourth lens having negative refractive power;

a fifth lens having positive refractive power; and

a sixth lens having negative refractive power and having optical surfaces, an image-sided surface of the optical surfaces having an aspherical shape with one or more inflection points other than an intersection point of the image-sided surface and an optical axis.

2. The image pickup lens according to claim 1, wherein following conditional expression is satisfied,

14≦

ν

3≦

35 

 

(1)

where ν

3 is an Abbe number of the third lens.

3. The image pickup lens according to claim 1, wherein following conditional expression is satisfied,

20≦

ν

5≦

60 

 

(2)

where ν

5 is an Abbe number of the fifth lens.

4. The image pickup lens according to claim 1, wherein following conditional expression is satisfied,

0.4≦

f1to2/f≦

1.0 

 

(3)

where f is a total focal length of the image pickup lens, and

f1to2 is a combined focal length of the first lens and the second lens.

5. The image pickup lens according to claim 1, wherein following conditional expression is satisfied,

−

1≦

f1/f2≦

30 

 

(4)

where f1 is a focal length of the first lens, and

f2 is a focal length of the second lens.

6. The image pickup lens according to claim 1, wherein following conditional expression is satisfied,

0≦

f3/f4≦

1.0 

 

(5)

where f3 is a focal length of the third lens, and

f4 is a focal length of the fourth lens.

7. The image pickup lens according to claim 1, wherein following conditional expression is satisfied,

−

10≦

(R9+R10)/(R9−

R10)≦

1 

 

(6)

where R9 is a radius of curvature of an object-sided surface of the fifth lens, and

R10 is a radius of curvature of an image-sided surface of the fifth lens.

8. The image pickup lens according to claim 1, wherein following conditional expression is satisfied,

−

5≦

(R11+R12)/(R11−

R12)≦

10 

 

(7)

where R11 is a radius of curvature of an object-sided surface of the sixth lens, and

R12 is a radius of curvature of an image-sided surface of the sixth lens.

9. The image pickup lens according to claim 1, further comprising an aperture stop arranged on an object-plane side of the first lens or between the first lens and the second lens.

10. The image pickup lens according to claim 1, wherein all of the first to sixth lenses are formed of plastic material, or only the first lens or the second lens in the first to sixth lenses is formed of glass material.

11. The image pickup lens according to claim 1, wherein the third lens is formed of a material same as a material of the fourth lens.

12. An image pickup unit with an image pickup lens and an image pickup device outputting an image pickup signal based on an optical image formed by the image pickup lens, the image pickup lens comprising:

in recited order from object plane toward image plane,

a first lens having positive refractive power;

a second lens having positive or negative refractive power;

a third lens having negative refractive power;

a fourth lens having negative refractive power;

a fifth lens having positive refractive power; and

a sixth lens having negative refractive power and having optical surfaces, an image-sided surface of the optical surfaces having an aspherical shape with one or more inflection points other than an intersection point of the image-sided surface and an optical axis.