Imaging lens
AssigneeKantatsu Co., Ltd.
InventorYukio Sekine
Life of this patent
Estimating the term…
Abstract
An imaging lens which uses a larger number of constituent lenses for higher performance and features a low F-value, low-profile design and a wide field of view. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in order from an object side to an image side: a first positive refractive power lens; a second negative refractive power lens; a third lens; a fourth lens; a fifth lens; a sixth lens having a concave image-side surface near an optical axis; and a seventh negative refractive power lens.
Claims20
An imaging lens in which elements are arranged in order from an object side to an image side, comprising:
- a first lens with positive refractive power;
- a second lens with negative refractive power;
- a third lens;
- a fourth lens;
- a fifth lens;
- a sixth lens having a concave surface on the image side near an optical axis;
- and
- a seventh lens with negative refractive power.
An imaging lens in which elements are arranged in order from an object side to an image side, comprising:
- a first lens with positive refractive power having a biconvex shape near an optical axis;
- a second lens;
- a third lens;
- a fourth lens;
- a fifth lens;
- a sixth lens as a double-sided aspheric lens having a convex surface on the object side near the optical axis;
- and
- a seventh lens with negative refractive power as a meniscus double-sided aspheric lens;
- wherein a conditional expression (10) below is satisfied;
- 2.0<|f34/f| (10)
- where
- f:
- focal length of an overall optical system of the imaging lens, and
- f34:
- composite focal length of the third lens and the fourth lens.
Dependencies are inferred from the claim text.