Optical imaging system
AssigneeZhejiang Sunny Optical Co., Ltd
InventorsMing Li, Saifeng Lyu
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Abstract
The disclosure discloses an optical imaging system including a first lens, a second lens, a third lens, and a plurality of subsequent lenses with refractive power and disposed sequentially along an optical axis from an object side to an image side, wherein a lens adjacent to an object side of a lens closest to an imaging plane has a positive refractive power, wherein the lens closest to the imaging plane has a negative refractive power, and an object side surface and an image side surface of the lens closest to an imaging plane are aspheric, and wherein a combined focal length f23 of the second lens and the third lens and an effective focal length fn of the lens closest to the imaging plane satisfy: −1.5<f23/fn<5.
Claims16
An optical imaging system including a first lens, a second lens, a third lens, and a plurality of subsequent lenses with refractive power and disposed sequentially along an optical axis from an object side to an image side,
- wherein the first to third lenses have +−+ refractive powers, an object side surface of the first lens is convex, and an image side surface of the second lens is concave,
- wherein a lens adjacent to an object side of a lens closest to an imaging plane has a positive refractive power,
- wherein the lens closest to the imaging plane has a negative refractive power, and an object side surface and an image side surface of the lens closest to the imaging plane are aspheric,
- wherein the total number of lenses is no greater than six,
- wherein a combined focal length f23 of the second lens and the third lens and an effective focal length fn of the lens closest to the imaging plane satisfy:
- −1.5<f23/fn<5, and wherein a half diagonal length ImgH of an effective pixel region on the imaging plane and an effective half-aperture DTn1 of the object-side surface of the lens closest to the imaging plane satisfy:
- 1<ImgH/DTn1<1.6,
- wherein f1≤4.35 mm and 3.04 mm≤f≤4.73 mm where f1 is an effective focal length of the first lens, and f is an effective foal length of the optical imaging system.
An optical imaging system including a first lens, a second lens, a third lens, and a plurality of subsequent lenses with refractive power and disposed sequentially along an optical axis from an object side to an image side,
- wherein the first to third lenses have +−+ refractive powers, an object side surface of the first lens is convex, and an image side surface of the second lens is concave,
- wherein a lens adjacent to an object side of a lens closest to an imaging plane has a positive refractive power,
- wherein the lens closest to the imaging plane has a negative refractive power, and an object-side surface and an image-side surface of the lens closest to the imaging plane are aspheric,
- wherein the total number of lenses is no greater than six,
- wherein an effective focal length f of the optical imaging system and an effective focal length f2 of the second lens satisfy:
- −3<f2/f<1.5, and
- wherein a half diagonal length ImgH of an effective pixel region on the imaging plane and an effective half-aperture DTn1 of the object-side surface of the lens closest to the imaging plane satisfy:
- 1<ImgH/DTn1<1.6,
- wherein f1≤3.17 mm and 3.04 mm≤f≤4.73 mm, where f1 is an effective focal length of the first lens.
Dependencies are inferred from the claim text.