Imaging optical lens assembly
First Claim
1. An imaging optical lens assembly including, in order from an object side to an image side:
- a first lens group comprising a first lens element with positive refractive power, no lens element with refractive power being disposed between the first lens element and an imaged object, the first lens element being the only lens element with refractive power in the first lens group; and
a second lens group comprising, in order from the object side to the image side;
a second lens element with negative refractive power;
a third lens element; and
a fourth lens element;
wherein focusing adjustment is performed by moving the first lens element along an optical axis, such that as a distance between the object and the imaging optical lens assembly changes from far to near, a distance between the first lens element and an image plane changes from near to far, and during focusing the other lens elements in the imaging optical lens assembly do not move relative to the imaging plane; and
wherein the number of the lens elements with refractive power in the imaging optical lens assembly is N, and it satisfies the relation;
4≦
N≦
5.
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Accused Products
Abstract
The present invention provides an imaging optical lens assembly including, in order from the object side to the image side: a first lens group comprising a first lens element with positive refractive power, no lens element with refractive power being disposed between the first lens element and an imaged object, the first lens element being the only lens element with refractive power in the first lens group; and a second lens group comprising, in order from the object side to the image side: a second lens element with negative refractive power; a third lens element; and a fourth lens element; wherein focusing adjustment is performed by moving the first lens element along an optical axis, such that as a distance between the imaged object and the imaging optical lens assembly changes from far to near, a distance between the first lens element and an image plane changes from near to far; and wherein the number of the lens elements with refractive power in the imaging optical lens assembly is N, and it satisfies the relation: 4≦N≦5. The abovementioned arrangement of optical elements and focusing adjustment method enable the imaging optical lens assembly to obtain good image quality and consume less power.
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Citations
19 Claims
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1. An imaging optical lens assembly including, in order from an object side to an image side:
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a first lens group comprising a first lens element with positive refractive power, no lens element with refractive power being disposed between the first lens element and an imaged object, the first lens element being the only lens element with refractive power in the first lens group; and a second lens group comprising, in order from the object side to the image side; a second lens element with negative refractive power; a third lens element; and a fourth lens element; wherein focusing adjustment is performed by moving the first lens element along an optical axis, such that as a distance between the object and the imaging optical lens assembly changes from far to near, a distance between the first lens element and an image plane changes from near to far, and during focusing the other lens elements in the imaging optical lens assembly do not move relative to the imaging plane; and
wherein the number of the lens elements with refractive power in the imaging optical lens assembly is N, and it satisfies the relation;
4≦
N≦
5.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for performing focusing for an imaging optical lens assembly, wherein the imaging optical lens assembly includes, in order from an object side to an image side:
- a first lens group comprising a first lens element with positive refractive power, no lens element with refractive power being disposed between the first lens element and an imaged object, the first lens element being the only lens element with refractive power in the first lens group; and
a second lens group comprising, in order from the object side to the image side;
a second lens element with negative refractive power;
a third lens element and a fourth lens element; and
wherein the method for performing focusing includes moving the first lens element along an optical axis, such that as a distance between the imaged object and the imaging optical lens assembly changes from far to near, a distance between the first lens element and an image plane changes from near to far. - View Dependent Claims (19)
- a first lens group comprising a first lens element with positive refractive power, no lens element with refractive power being disposed between the first lens element and an imaged object, the first lens element being the only lens element with refractive power in the first lens group; and
Specification