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Camera lens group
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A camera lens and lens technology, which is applied in the field of camera lens groups, can solve problems such as inability to correct off-axis meridian aberration and sagittal aberration
Pending Publication Date: 2021-07-30
ZHEJIANG SUNNY OPTICAL CO LTD
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Problems solved by technology
Since the current various types of terminal camera lens groups mostly use rotationally symmetrical (axisymmetric) aspheric surface structures, and they only have sufficient degrees of freedom in the meridional direction, they cannot be well adjusted for off-axis meridional aberrations and arc Effective correction of sagittal aberration
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specific Embodiment 1
[0068] figure 1 It is a schematic diagram of the structure of the lens group of Embodiment 1 of the camera lens group of the present invention. The camera lens group includes in sequence from the object side to the image side along the optical axis: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, The fourth lens E4, the fifth lens E5, the filter E6 and the imaging surface S13.
[0069]The first lens E1 has positive refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has negative refractive power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has positive refractive power, its object side S5 is convex, and its image side S6 is convex. The fourth lens E4 has positive refractive power, its object side S7 is concave, and its image side S8 is convex. The fifth lens E5 has positive refractive power, its object side S9 is convex, and its image side S10 is convex. The filter E...
Embodiment 1
[0077] The camera lens group in embodiment 1 satisfies:
[0078] the tan 2 (Semi-FOV) × f=2.63mm, wherein, Semi-FOV is half of the maximum field of view angle of camera lens group, and f is the effective focal length of camera lens group;
[0079] f1 / f4=0.77, wherein, f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens;
[0080] f34 / BFL=3.72, wherein, f34 is the combined focal length of the third lens and the fourth lens, and BFL is the distance on the optical axis from the image side of the fifth lens to the imaging plane of the camera lens group;
[0081] f23 / R10=2.29, wherein, f23 is the combined focal length of the second lens and the third lens, and R10 is the radius of curvature of the image side of the fifth lens;
[0082] R3 / R4=3.09, wherein, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens;
[0083] R3 / R1=6.99, wherein, ...
specific Embodiment 2
[0104] Figure 4 It is a schematic diagram of the structure of the lens group of Embodiment 2 of the camera lens group of the present invention. The camera lens group includes in sequence from the object side to the image side along the optical axis: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, The fourth lens E4, the fifth lens E5, the filter E6 and the imaging surface S13.
[0105] The first lens E1 has positive refractive power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has negative refractive power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has positive refractive power, its object side S5 is concave, and its image side S6 is convex. The fourth lens E4 has positive refractive power, its object side S7 is concave, and its image side S8 is convex. The fifth lens E5 has positive refractive power, its object side S9 is convex, and its image side S10 is convex. The filte...
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Abstract
The invention discloses a camera lens group, which sequentially comprises, from an object side to an image side along an optical axis, a diaphragm; a first lens with positive focal power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens with focal power; a fourth lens with positive focal power, wherein the image side surface of the fourth lens is a convex surface; a fifth lens with focal power, wherein the image side surface of the fifth lens is a convex surface; at least one surface of at least one lens among the first to fifth lenses has a non-rotationally symmetrical aspheric surface; wherein half of the maximum field angle Semi-FOV of the camera lens group and the effective focal length f of the camera lens group meet the conditional expression that tan2 (Semi-FOV) * f is more than 0.50 mm and less than 3.00 mm. According to the camera lens group provided by the invention, the free-form surface is applied to the design and production of the camera lens, the meridian aberration and sagittal aberration outside the axis can be effectively corrected, and the camera lens group has the advantages of high pixel and miniaturization, and can better meet the use requirements of various special scenes.
Description
technical field [0001] The invention belongs to the field of optical imaging, in particular to a camera lens group including five lenses and a free-form surface design. Background technique [0002] With the development of miniaturized camera lenses and the popularity of large-size, high-pixel chips in recent years, major terminal manufacturers have put forward higher requirements for the performance of camera lenses. Since the current various types of terminal camera lens groups mostly use rotationally symmetrical (axisymmetric) aspheric surface structures, and they only have sufficient degrees of freedom in the meridional direction, they cannot be well adjusted for off-axis meridional aberrations and arc Sagittal aberration is effectively corrected. [0003] The free-form surface is a non-rotationally symmetric aspheric surface, which not only increases the non-rotationally symmetric component, but also increases the degree of freedom for optimization. It can effectively ...
Claims
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Application Information
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