Optical lens
AssigneeAbility Enterprise Co., Ltd.
InventorChia-Hung Chen
Life of this patent
Estimating the term…
Abstract
An optical lens is provided. The optical lens includes, in order from an object side to an image-forming side, a first lens having refractive power, a second lens having refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power and a fifth lens having refractive power. The object-side surface of the first lens is a concave surface or a flat surface. The overall optical effect of the first lens and the second lens is negative refractive power. The refractive rate on the object-side surface and/or the image-side surface of the fifth lens from the center point in a radial direction away from the optical axis changes in the same tendency.
Claims5
An optical lens, in order from an object side to an image-forming side, consisting of:
- a first lens having refractive power, an object-side surface of the first lens is one of a concave surface and a flat surface;
- a second lens having refractive power, an overall optical effect of the first lens and the second lens is negative refractive power;
- a third lens having positive refractive power, an Abbe number of the third lens is V3;
- a fourth lens having positive refractive power;
- and
- a fifth lens having negative refractive power, an Abbe number of the fifth lens is V5, the optical lens satisfies V5>V3, a distance from the object-side surface of the first lens to an imaging plane is TTL, a focal length of the optical lens is f, an image height of the optical lens is Y′, a field of view of the optical lens is FOV, an aperture of the optical lens is Fno, the optical lens satisfies 2≤TTL/f≤4, and further satisfies at least one of the following conditions:
- 0.5≤f/Y′≤1.5, 90°≤FOV≤180° and 0<(Fno×TTL)/(FOV×Y′)≤0.3.
Dependencies are inferred from the claim text.