Optical lens
AssigneeYoung Optics Inc.
InventorChen-Cheng Liao
Life of this patent
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Abstract
An optical lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged sequentially along an optical axis from an magnified side to a minified side. A center thickness of the first lens is TH1, a center thickness of the second lens is TH2, a center thickness of the third lens is TH3, a center thickness of the fourth lens is TH4, a center thickness of the fifth lens is TH5, and an effective focal length of the optical lens is EFL, wherein the optical lens fits at least one of the following conditions: (1) 0.52<(TH1+TH2+TH3)/EFL<1.0; (2) 0.5<(TH3+TH4+TH5)/EFL<0.65; and (3) (TH1+TH2+TH3)/(TH3+TH4+TH5)>1.20. The optical lens can reduce aberration and has high resolution.
Claims20
An optical lens, comprising:
- a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged along an optical axis from a magnified side to a minified side, wherein a center thickness of the first lens is TH1, a center thickness of the second lens is TH2, a center thickness of the third lens is TH3, a center thickness of the fourth lens is TH4, a center thickness of the fifth lens is TH5, an effective focal length of the optical lens is EFL, and the optical lens fits at least one of the following conditions:
- (1) 0.52<(TH1+TH2+TH3)/EFL<1.0;
- (2) 0.5<(TH3+TH4+TH5)/EFL<0.65;
- and (3) (TH1+TH2+TH3)/(TH3+TH4+TH5)>1.20, and wherein the third lens includes a surface facing the minified side, and the fourth lens includes a surface facing the magnified side, and wherein an end point of the surface facing the minified side of the third lens closest to the minified side projects onto the light axis to form a first projection point, and an end point of the surface facing the magnified side of the fourth lens closest to the magnified side projects onto the light axis to form a second projection point, and wherein the first projection point is located between the second projection point and the magnified side.
An optical lens, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged along an optical axis from a magnified side to a minified side, wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, and the fifth lens has negative refractive power, and wherein the third lens includes a surface facing the minified side, and the fourth lens includes a surface facing the magnified side, and wherein an end point of the surface facing the minified side of the third lens closest to the minified side projects onto the light axis to form a first projection point, and an end point of the surface facing the magnified side of the fourth lens closest to the magnified side projects onto the light axis to form a second projection point, and wherein the first projection point is located between the second projection point and the magnified side.
Dependencies are inferred from the claim text.