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US 12,306,381 B2Granted
Camera lens assembly comprising four lenses of +−++, ++−+ or +−−+ regractive powers
AssigneeZhejiang Sunny Optical Co., Ltd
InventorXinquan Wang
Life of this patent
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Abstract
The present disclosure discloses a camera lens assembly, the camera lens assembly having a total effective focal length f and an entrance pupil diameter EPD, and along an optical axis from an object side to an image side sequentially including a first lens, a second lens, a third lens and a fourth lens, wherein the first lens and the fourth lens have positive refractive powers, an image-side surface of the first lens is a concave surface, and an object-side surface of the fourth lens is a convex surface. In addition, the total effective focal length f and the entrance pupil diameter EPD satisfy: f/EPD≤2.
Claims7
A camera lens assembly, the camera lens assembly along an optical axis from an object side to an image side sequentially comprising:
- a first lens, a second lens, a third lens and a fourth lens, a number of lenses in the camera lens assembly being four;
- wherein, the first lens has a positive refractive power, and an image-side surface of the first lens is a concave surface;
- the fourth lens has a positive refractive power, and an object-side surface of the fourth lens is a convex surface;
- a filter is disposed between the fourth lens and the image side, the filter is a band-pass filter, a band-pass wavelength λ of the band-pass filter is determined based on a wavelength of a used light source, a long wave cut-off wavelength of the band-pass wavelength λ is 15 nm to 50 nm longer than a longest wavelength of the wavelength of the used light source, and a short wave cut-off wavelength of the band-pass wavelength λ is 15 nm to 50 nm shorter than a shortest wavelength of the wavelength of the used light source;
- the camera lens assembly having a total effective focal length f and an entrance pupil diameter EPD, wherein the total effective focal length f and the entrance pupil diameter EPD satisfy:
- 1.5≤f/EPD≤1.6;
- an effective focal length f1 of the first lens and the total effective focal length f of the camera lens assembly satisfies:
- 1<f1/f<1.9;
- and
- a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy:
- 1.207≤(CT2+CT3)/CT4<1.6 and 0.5<CT2/CT3<1.
8 more elements
A camera lens assembly, the camera lens assembly along an optical axis from an object side to an image side sequentially comprising:
- a first lens, a second lens, a third lens and a fourth lens, a number of lenses in the camera lens assembly being four;
- wherein, the first lens has a positive refractive power, and an image-side surface of the first lens is a concave surface;
- the fourth lens has a positive refractive power, and an object-side surface of the fourth lens is a convex surface;
- a filter is disposed between the fourth lens and the image side, the filter is a band-pass filter, a band-pass wavelength λ of the band-pass filter is determined based on a wavelength of a used light source, a long wave cut-off wavelength of the band-pass wavelength λ is 15 nm to 50 nm longer than a longest wavelength of the wavelength of the used light source, and a short wave cut-off wavelength of the band-pass wavelength λ is 15 nm to 50 nm shorter than a shortest wavelength of the wavelength of the used light source;
- the camera lens assembly having a total effective focal length f and an entrance pupil diameter EPD, wherein the total effective focal length f and the entrance pupil diameter EPD satisfy:
- 1.5≤f/EPD≤1.6;
- a center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy:
- 0.728≤CT2/CT3<1;
- and
- an effective focal length f1 of the first lens and the total effective focal length f of the camera lens assembly satisfies:
- 1<f1/f<1.9.
8 more elements
A camera lens assembly, the camera lens assembly along an optical axis from an object side to an image side sequentially comprising:
- a first lens, a second lens, a third lens and a fourth lens, a number of lenses in the camera lens assembly being four;
- wherein, the first lens has a positive refractive power, and an image-side surface of the first lens is a concave surface;
- the fourth lens has a positive refractive power, and an object-side surface of the fourth lens is a convex surface;
- a filter is disposed between the fourth lens and the image side, the filter is a band-pass filter, a band-pass wavelength λ of the band-pass filter is determined based on a wavelength of a used light source, a long wave cut-off wavelength of the band-pass wavelength λ is 15 nm to 50 nm longer than a longest wavelength of the wavelength of the used light source, and a short wave cut-off wavelength of the band-pass wavelength λ is 15 nm to 50 nm shorter than a shortest wavelength of the wavelength of the used light source;
- the camera lens assembly having a total effective focal length f and an entrance pupil diameter EPD, wherein the total effective focal length f and the entrance pupil diameter EPD satisfy:
- 1.5≤f/EPD≤1.6;
- an effective radius DT11 of an object-side surface of the first lens, and an effective radius DT22 of an image-side surface of the second lens satisfy:
- 0.7<DT11/DT22<1.2;
- and
- a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy:
- 1.207≤(CT2+CT3)/CT4<1.6 and 0.5<CT2/CT3<1.
8 more elements
Dependencies are inferred from the claim text.