Imaging lens
AssigneeKantatsu 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.
Claims17
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;
- 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;
- a sixth lens that is a double-sided aspheric lens having negative refractive power, an image-side surface of the sixth lens having an aspheric shape in which a portion near an optical axis has a concave shape and the concave shape changes to a convex shape in a peripheral portion separated from the optical axis;
- a seventh lens that is a double-sided aspheric lens;
- and
- air gaps disposed between each pair of adjacent lenses.
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 and a meniscus shape near an optical axis;
- 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;
- a sixth lens that is a double-sided aspheric lens having negative refractive power;
- a seventh lens that is a double-sided aspheric lens;
- and
- air gaps disposed between each pair of adjacent lenses,
- wherein an image-side surface of the sixth lens has an aspheric shape in which a portion near the optical axis has a concave shape and the concave shape changes to a convex shape in a peripheral portion separated from the 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 or negative refractive power;
- a third lens;
- a fourth lens that is a double-sided aspheric lens having positive refractive power;
- a fifth lens that is a double-sided aspheric lens;
- a sixth lens that is a double-sided aspheric lens having negative refractive power;
- a seventh lens that is a double-sided aspheric lens;
- and
- air gaps disposed between each pair of adjacent lenses,
- wherein an image-side surface of the sixth lens has an aspheric shape in which a portion near an optical axis has a concave shape and the concave shape changes to a convex shape in a peripheral portion separated from the optical axis, and
- when f12 is a composite focal length of the first lens and the second lens, and f is an overall focal length of the imaging lens, a conditional expression (1) below is satisfied:
- 0<f12/f. (1)
Dependencies are inferred from the claim text.