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US 9,989,731 B2Granted
Optical imaging lens
AssigneeGenius Electronic Optical (Xiamen) Co., Ltd.
InventorsKuo-Wen Chang, Wei-Chih Chao, Feng Li
Life of this patent
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Abstract
An optical imaging lens includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The first lens element has positive refracting power. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The second lens element has refracting power. At least one of the object-side surface and the image-side surface of the third lens element is an aspheric surface. The object-side surface and the image-side surface of the fourth lens element are both aspheric surfaces.
Claims20
An optical imaging lens, comprising:
- a plurality of lens elements arranged in order from an object side to an image side along an optical axis, the lens elements comprising a first lens element, a second lens element, a third lens element, and a fourth lens element, arranged in order from the object side to the image side along the optical axis, the first lens element is arranged to be a lens element having refracting power in a first order from the object side to the image side, the fourth lens element is arranged to be a lens element having refracting power in a first order from the image side to the object side, the third lens element is arranged to be a lens element having refracting power in a second order from the image side to the object side, the second lens element is arranged to be a lens element having refracting power in a third order from the image side to the object side, each of the first to the fourth lens elements respectively having an object-side surface facing the object side and allowing image rays to pass through, and an image-side surface facing the image side and allowing the image rays to pass through;
- the first lens element having a positive refracting power and the object-side surface of the first lens element having a convex portion in a vicinity of the optical axis;
- at least one of the object-side surface and the image-side surface of the third lens element being an aspheric surface;
- the object-side surface and the image-side surface of the fourth lens element being both aspheric surfaces;
- and
- the optical imaging lens having only one variable gap, and the variable gap being a gap between adjacent two lens elements,
- wherein the optical imaging lens satisfies:
- 0.7≤EFL/(fG×F/#),
- where EFL is an effective focal length of the optical imaging lens, fG is a focal length of a lens group formed from all of lens elements at an object side of the variable gap, and F/# is a f-number of the optical imaging lens.
6 more elements
An optical imaging lens, comprising:
- a plurality of lens elements, arranged in order from an object side to an image side along an optical axis, the lens elements comprising a first lens element, a second lens element, a third lens element, and a fourth lens element, arranged in order from the object side to the image side along the optical axis, the first lens element is arranged to be a lens element having refracting power in a first order from the object side to the image side, the fourth lens element is arranged to be a lens element having refracting power in a first order from the image side to the object side, the third lens element is arranged to be a lens element having refracting power in a second order from the image side to the object side, the second lens element is arranged to be a lens element having refracting power in a third order from the image side to the object side, each of the first to the fourth lens elements having an object-side surface facing the object side and allowing image rays to pass through, and an image-side surface facing the image side and allowing the image rays to pass through;
- the first lens element having a positive refracting power and the object-side surface of the first lens element having a convex portion in a vicinity of the optical axis;
- at least one of the object-side surface and the image-side surface of the third lens element being an aspheric surface;
- the object-side surface and the image-side surface of the fourth lens element being both aspheric surfaces;
- and
- the optical imaging lens having only one variable gap,
- wherein the optical imaging lens satisfies:
- 0.5≤EFL/(fG×F/#);
- and
- (TTL×F/#)/EFL≤2.4,
- where EFL is an effective focal length of the optical imaging lens, fG is a focal length of a lens group formed from all of lens elements at an object side of the variable gap, F/# is a f-number of the optical imaging lens, and TTL is distance on the optical axis between the object-side surface of the first lens element and an image plane of the optical image lens.
8 more elements
Dependencies are inferred from the claim text.