Taking lens system
AssigneeKonica Minolta Opto, Inc.
InventorMasashi Isono
Life of this patent
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Abstract
A taking lens system for forming an image on a solid-state image sensor has, from the object side thereof: an aperture stop, a first lens element having a positive optical power and convex to the object side, a second lens element having a positive optical power and convex to the image-surface side, and a third lens element having a negative optical power and concave to the image-surface side. Alternatively, a taking lens system for forming an image on a solid-state image sensor has an aperture stop, a first lens element having a positive optical power, having a meniscus shape, and convex to the object side, a second lens element having a positive optical power, and a third lens element having a negative optical power. In addition, in either case, the taking lens system fulfills prescribed conditional formulae.
Claims8
A taking lens system for forming an image on a solid-state image sensor, the taking lens system comprising, from an object side thereof:
- an aperture stop;
- a first lens element having a positive optical power and convex to the object side;
- a second lens element having a positive optical power and convex to an image-surface side;
- and
- a third lens element having a negative optical power and concave to the image-surface side,
- wherein the following conditional formulae (1) and (2) are fulfilled:
- 1.3<f1/f2<3 (1)
- −4<(r2+r3)/(r2−r3)<−2 (2)
- where
- f1 represents a focal length of the first lens element;
- f2 represents a focal length of the second lens element;
- r2 represents a radius of curvature of an object-side surface of the first lens element;
- and
- r3 represents a radius of curvature of an image-side surface of the first lens element.
A taking lens system for forming an image on a solid-state image sensor, the taking lens system comprising, from an object side thereof:
- an aperture stop;
- a first lens element having a positive optical power, having a meniscus shape, and convex to the object side;
- a second lens element having a positive optical power;
- and
- a third lens element having a negative optical power,
- wherein the following conditional formulae (1) and (2) are fulfilled:
- 1.3<f1/f2<3 (1)
- −4<(r2+r3)/(r2−r3)<−2 (2)
- where
- f1 represents a focal length of the first lens element;
- f2 represents a focal length of the second lens element;
- r2 represents a radius of curvature of an object-side surface of the first lens element;
- and
- r3 represents a radius of curvature of an image-side surface of the first lens element.
Dependencies are inferred from the claim text.