Imaging lens
AssigneeGenius Electronic Optical Co., Ltd.
InventorShihhan Chen
Life of this patent
Estimating the term…
Abstract
A four element lens system for use with an imaging sensor includes first, second, third, and fourth lens elements and an optical filter that are arranged sequentially in order from an object side to an imaging side. The lens elements are coated with an anti-reflective film. The lens system further includes an optical filter that is disposed at a distance from the imaging sensor. The lens elements are relatively positioned to each other to satisfy specific conditions. The lens elements further include thickness to diameters ratios that satisfy specific conditions.
Claims15
An imaging lens comprising first, second, third, and fourth lens elements arranged in order from an object side to an imaging side, each of the first, second, third, and fourth lens elements having an object side surface facing toward the object side, and an imaging side surface facing toward the imaging side, wherein,
- 30<vd1−vd2;
- 0.4<d3avg/d4avg<0.7;
- and
- a ratio of a ratio between a sag at 5 percent point and a sag at 100 percent point of the imaging-side surface of the first lens element is in a range from −0.0082 to 0.0114.
An imaging lens comprising first, second, third, and fourth lens elements arranged in order from an object side to an imaging side, each of the first, second, third, and fourth lens elements having an object side surface facing toward the object side, and an imaging side surface facing toward the imaging side, the imaging lens satisfies the conditions of:
- 30<vd1−vd2;
- 0.5<d1avg/d2avg <0.9;
- and
- 0.4<d3avg/d4avg<0.7.
Dependencies are inferred from the claim text.