Imaging lens
AssigneeTokyo Visionary Optics Co., Ltd.
InventorMasaya Hashimoto
Life of this patent
Estimating the term…
Abstract
An imaging lens which uses a larger number of constituent lenses for higher performance and features compactness and a wide field of view. The imaging lens is composed of seven lenses to form an image of an object on a solid-state image sensor. The constituent lenses are arranged in the following order from an object side to an image side: a first lens with positive refractive power; a second lens with positive or negative refractive power; a third lens with negative refractive power; a fourth lens with positive or negative refractive power as a double-sided aspheric lens; a meniscus fifth lens having a convex surface on the image side; a sixth lens with positive or negative refractive power as a double-sided aspheric lens; and a seventh lens with negative refractive power, in which an air gap is provided between lenses.
Claims20
An imaging lens for a solid-state image sensor, comprising in order from an object side to an image side of the imaging lens:
- 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 that is a double-sided aspheric lens having positive or negative refractive power;
- a fifth lens that is a double-sided aspheric lens having positive or negative refractive power;
- a sixth lens that is a double-sided aspheric lens having positive or negative refractive power;
- a seventh lens that is a double-sided aspheric lens having negative refractive power;
- and
- air gaps disposed between each pair of adjacent lenses,
- wherein the imaging lens has a total of seven single lenses, and the sixth lens has a concave surface on the image side near an optical axis.
An imaging lens for a solid-state image sensor, comprising in order from an object side to an image side of the imaging lens:
- a first lens having positive refractive power;
- a second lens having positive refractive power;
- a third lens having negative refractive power;
- a fourth lens that is a double-sided aspheric lens having positive or negative refractive power;
- a fifth lens that is a double-sided aspheric lens having positive or negative refractive power;
- a sixth lens that is a double-sided aspheric lens having positive or negative refractive power;
- a seventh lens that is a double-sided aspheric lens having negative refractive power;
- and
- air gaps disposed between each pair of adjacent lenses,
- wherein the third lens has a convex surface on the object side near an optical axis, and conditional expression (8) below is satisfied:
- 20<νd3<30 (8)
- where
- νd3:
- Abbe number of the third lens at d-ray.
Dependencies are inferred from the claim text.