Image pickup lens and image pickup unit
AssigneeSony Corporation
InventorsTakayuki Yamazaki, Kenshi Nabeta
Life of this patent
Estimating the term…
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.
Claims11
An image pickup lens comprising:
- in recited order from an object plane towards an 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 biconvex shape;
- 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,
- wherein following conditional expression is satisfied,
- 0≦f3/f4≦1.0 (1)
- where f3 is a focal length of the third lens, and
- f4 is a focal length of the fourth lens.
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 an object plane towards an 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,
- wherein following conditional expression is satisfied,
- 0≦f3/f4≦1.0 (1)
- where f3 is a focal length of the third lens, and
- f4 is a focal length of the fourth lens.
Dependencies are inferred from the claim text.