Optical image capturing system including five lenses of −+++−, ++++−, −+−−+, +−++− or +−+++ refractive powers
AssigneeAbility Opto-Electronics Technology Co., Ltd.
InventorsYeong-Ming Chang, Chien-Hsun Lai, Yao-Wei Liu
Life of this patent
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Abstract
An optical image capturing system includes, along the optical axis in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. At least one lens among the first to the fifth lenses has positive refractive force. The fifth lens can have negative refractive force, wherein both surfaces thereof are aspheric, and at least one surface thereof has an inflection point. The lenses in the optical image capturing system which have refractive power include the first to the fifth lenses. The optical image capturing system can increase aperture value and improve the imaging quality for use in compact cameras.
Claims25
An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
- a first lens having refractive power;
- a second lens having refractive power;
- a third lens having refractive power;
- a fourth lens having refractive power;
- a fifth lens having refractive power;
- and
- an image plane specifically for infrared light;
- wherein the optical image capturing system has a total of the five lenses with refractive power;
- at least one lens among the first lens to the fifth lens has positive refractive power;
- each lens among the first lens to the fifth lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side;
- wherein the optical image capturing system satisfies:
- 0.5≤f/HEP≤0.9;
- 0 deg<HAF≤50 deg;
- and
- 0.9≤2(ARE/HEP)≤2.0;
- wherein f is a focal length of the optical image capturing system;
- HEP is an entrance pupil diameter of the optical image capturing system;
- HAF is a half of a maximum view angle of the optical image capturing system;
- for any surface of any lens, ARE is a profile curve length measured from a start point where the optical axis passes therethrough, along a surface profile thereof, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis.
Dependencies are inferred from the claim text.