24mm breathing-eliminating full-frame camera lens

Abstract

The utility model discloses a 24-mm breathing-eliminating full-frame camera lens which sequentially comprises a first lens group, an iris diaphragm, a second lens group and a third lens group from an object side to an imaging surface, the first lens group serves as a fixed group, the focal power is positive, the first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, and the first lens is a meniscus negative lens bent towards an image surface; the second lens group serves as a focusing group, the focal power is positive, the second lens group comprises a ninth lens and a tenth lens, and the ninth lens is an aspheric glass lens; according to the utility model, the high performance of the F1.8 maximum aperture can be realized, the imaging is excellent at infinity and close-up distance, the distortion is less than 3%, the structure is simplified, and the tolerance tolerance is reduced, so that the change of the drawing angle of the system tends to be gentle when the far and near shooting is switched, the discomfort of video shooting is greatly reduced, and the shooting experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to camera lens technical field, concretely is a 24mm breathes full frame camera lens of eliminating. BACKGROUND

[0002] Because of the popularity of short videos on social platforms, more and more netizens share and exchange by shooting daily vlogs. For these groups, it is more efficient to have a small and portable automatic mirrorless camera lens. Early micro-single lenses on the market mainly focused on shooting quality, matching customer needs through large aperture, small distortion, and blur effects, but early products did not take into account the uncomfortable breathing and shaking during video shooting. If a lens can be developed that not only has excellent resolution, small distortion, large aperture, and portability, but also greatly reduces breathing and shaking during video shooting, it will be highly valued by professionals in the market and have great product competitiveness. Therefore, the utility model designs a 24mm breathes full frame camera lens to improve the above problems. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model aims at providing a 24mm breathes full frame camera lens, which can achieve F1.8 maximum aperture high performance, excellent imaging at infinite and close-up distance, less than 3% distortion, simplified structure, reduced tolerance, and smooth angle change when switching between far and close-up shooting, greatly reducing the discomfort of video shooting and improving the photography experience.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] A 24mm breathes full frame camera lens, sequentially including a first lens group, a variable diaphragm, a second lens group and a third lens group from the object side to the imaging surface;

[0006] The first lens group is a fixed group with positive refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens;

[0007] The second lens group is a focusing group with positive refractive power, including a ninth lens and a tenth lens, wherein the ninth lens is a non-spherical glass lens;

[0008] The third lens group is a fixed group with negative refractive power, including an eleventh lens, a twelfth lens and a thirteenth lens.

[0009] Preferably, the first lens 1 is a curved moon negative lens curved towards the image side, satisfying the following conditions:

[0010] -4 < (L1R2+L1R1) / (L1R2-L1R1) < -1.5

[0011] wherein L1R1 is the radius of curvature of the side of the first lens 1 close to the object side, and L1R2 is the radius of curvature of the side of the first lens 1 close to the imaging plane.

[0012] Preferably, the third lens is a meniscus positive lens curved toward the image side, satisfying the following condition:

[0013] Nd3>1.77

[0014] 4.4 < F3 / f < 7.1

[0015] wherein Nd3 is the refractive index of the third lens, F3 is the focal length of the third lens, and f is the focal length of the camera lens optical system.

[0016] Preferably, at least one lens in the first lens group satisfies the following condition:

[0017] Vd>70

[0018] wherein Vd is the Abbe number of the lens material in the first lens group.

[0019] Preferably, the focal length of the first lens group satisfies the following condition:

[0020] 0.59 < FG1 / f < 2.43

[0021] wherein FG1 is the focal length of the first lens group, and f is the focal length of the camera lens optical system.

[0022] Preferably, the first lens in the second lens group is a aspheric meniscus negative lens curved toward the object side, satisfying the following condition:

[0023] |L9R1| / f < 0.7

[0024] wherein L9R1 is the radius of curvature of the side of the ninth lens close to the object side, and f is the focal length of the camera lens optical system.

[0025] Preferably, the focal length of the second lens group satisfies the following condition:

[0026] 1.21 < FG2 / f < 2.79

[0027] wherein FG2 is the focal length of the second lens group, and f is the focal length of the camera lens optical system. Preferably, at least one lens in the third lens group satisfies the following condition:

[0028] Vd>70.4

[0029] Wherein, Vd is the Abbe number of the lens material in the third lens group.

[0030] Compared with the prior art, the utility model has the beneficial effects that:

[0031] The utility model discloses structure short and light weight, and when obtaining cost and appearance advantage, realize the high performance of F1.8 maximum aperture, and the imaging is excellent at infinite and near camera distance, and the distortion is less than 3%; System is divided into 3 groups of mirror groups, and the structure is simplified, and the tolerance accommodation degree is reduced; Use low wave high transmission glass material, restore real color; Through the calculation selection of the mobile group that satisfies low breathing effect, adjust the light incidence position and length and positive and negative focal length proportion of the mobile group, make the angle of view change tend to be gentle when the system switches in the near and far shooting, greatly reduce the discomfort of video shooting, improve the photographic experience, use aspheric glass lens in the mobile group, significantly reduce the size and weight of the mobile group, and the motor load is small, and the focusing efficiency is effectively guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the lens structure schematic diagram of 24mm breathing full camera lens;

[0033] Figure 2 It is the spherical aberration curve diagram of 24mm breathing full camera lens;

[0034] Figure 3 It is the field curvature curve diagram of 24mm breathing full camera lens;

[0035] Figure 4 It is the distortion curve diagram of 24mm breathing full camera lens.

[0036] In the drawing: G1, first lens group;G2, second lens group;G3, third lens group;1, first lens;2, second lens;3, third lens;4, fourth lens;5, fifth lens;6, sixth lens;7, seventh lens;8, eighth lens;9, ninth lens;10, tenth lens;11, eleventh lens;12, twelfth lens;13, thirteenth lens. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0038] Embodiment:

[0039] Please refer toFigure 1 The embodiment provides a 24mm breath-reducing full-frame camera lens, which comprises, in sequence from an object side to an imaging surface, a first lens group G1, a variable diaphragm, a second lens group G2 and a third lens group G3.

[0040] The first lens group G1 is a fixed group, has positive refractive power and comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and an eighth lens 8.

[0041] The second lens group G2 is a focusing group (moving group), has positive refractive power and comprises a ninth lens 9 and a tenth lens 10, wherein the ninth lens 9 is a non-spherical glass lens.

[0042] The third lens group G3 is a fixed group, has negative refractive power and comprises an eleventh lens 11, a twelfth lens 12 and a thirteenth lens 13, wherein the number of lenses in the first lens group G1, the second lens group G2 and the third lens group G3 is designed according to design and use requirements, and the number of lenses is increased or decreased, which belongs to the protection range of the embodiment.

[0043] In the embodiment, the first lens 1 is a meniscus negative lens bending towards an image side, and the following conditions are met:

[0044] -4<(L1 R2+L1 R1) / (L1 R2-L1 R1)<-1.5

[0045] Wherein L1 R1 is the curvature radius of the side of the first lens 1 close to the object side, and L1 R2 is the curvature radius of the side of the first lens 1 close to the imaging surface.

[0046] In the embodiment, the third lens 3 is a meniscus positive lens bending towards the image side, and the following conditions are met:

[0047] Nd3>1.77

[0048] 4.4<F3 / f<7.1

[0049] Wherein Nd3 is the refractive index of the third lens 3, F3 is the focal length of the third lens 3, and f is the focal length of the camera lens optical system.

[0050] In the embodiment, at least two lenses in the first lens group G1 meet the following conditions:

[0051] Vd>70

[0052] Wherein Vd is the Abbe number of the lens material in the first lens group G1.

[0053] In the embodiment, the focal length of the first lens group G1 meets the following conditions:

[0054] 0.59 < FG1 / f < 2.43

[0055] Where FG1 is the focal length of the first lens group G1, and f is the focal length of the camera lens optical system.

[0056] In this embodiment, the first lens in the second lens group G2 (i.e. the ninth lens 9) is a meniscus negative lens with a non-spherical surface curved towards the object side, and satisfies the following condition:

[0057] |L9R1| / f < 0.7

[0058] Where L9R1 is the radius of curvature of the side of the first lens in the second lens group G2 (i.e. the ninth lens 9) closer to the object side, and f is the focal length of the camera lens optical system.

[0059] In this embodiment, the focal length of the second lens group G2 satisfies the following condition:

[0060] 1.21 < FG2 / f < 2.79

[0061] Where FG2 is the focal length of the second lens group G2, and f is the focal length of the camera lens optical system. In this embodiment, at least one lens in the third lens group G3 satisfies the following condition:

[0062] Vd > 70.4

[0063] Where Vd is the Abbe number of the material of the lens in the third lens group G3.

[0064] As a preferred embodiment of the technical solution, the parameters of the camera lens embodiment are shown in Table 1 below, and the non-spherical coefficients of the non-spherical lenses are shown in Table 2 below. In the surface number column, the surface number is shown when the surface closer to the object side is set as the first surface and the surface numbers are sequentially increased towards the imaging surface side. The shape parameters of each lens are shown in the table:

[0065] Table 1

[0066]

[0067] Table 2

[0068] Surface number 14 15 k -3.688491 -7.174549 A4 -5.7836e-07 -5.5426788e-05 A6 -4.6776508e-08 2.4497316e-07 A8 4.0739182e-10 -1.1092454e-09 A10 -1.4873025e-12 3.6050791e-12 A12 1.3752243e-15 -5.9657115e-15

[0069] As a preferred embodiment of the technical solution, the positions of the focus compensation groups (moving groups) of the camera lens in different focus states in this embodiment are shown in Table 3 below, i.e. the numerical values of the two states of D1 and D2 in Table 1:

[0070] Table 3

[0071] Conjugate distance Infinity Closest (0.2m) D1 15.7mm 11.25mm D2 0.9mm 5.35mm

[0072] As a preferred technical solution, the physical parameters of the camera lens in the embodiment are shown in Table 4 as follows:

[0073] Table 4

[0074] Focal length f 24.34mm Relative aperture FNO. 1.85 Field of view angle ω 84.1° Optical total length 112.7mm

[0075] Figure 2 The spherical aberration curve of the camera lens in the embodiment is shown in the following figure, Figure 3 The field curvature curve of the camera lens in the embodiment is shown in the following figure, Figure 4 The distortion curve of the camera lens in the embodiment is shown in the following figure, and it can be seen that the camera lens of the embodiment has good imaging effect.

[0076] In the embodiment, through the limitation of the above condition formula, the structure is small and light, and the high performance of F1.8 maximum aperture is realized while the cost and appearance advantages are obtained. The imaging at infinite distance and close-up distance is excellent, and the distortion is less than 3%. The system is divided into three groups of lenses, the structure is simplified, and the tolerance allowance is reduced. Low-wave high-transmission glass material is used to restore real colors. The moving group satisfying low breathing effect is selected through calculation, the light incidence position and length of the moving group and the positive and negative focal length ratio are adjusted, the angle of view change of the system tends to be flat when shooting at far and near distances is switched, the discomfort of video shooting is greatly reduced, and the photography experience is improved. Aspherical glass lens is used in the moving group, the size and weight of the moving group are significantly reduced, the motor load is small, and the focusing efficiency is effectively guaranteed.

[0077] The above embodiment is a preferred implementation scheme of the utility model, in addition to this, the utility model can be realized in other ways, and any obvious replacement without departing from the technical scheme concept is within the protection scope of the utility model.

Claims

1. A 24mm full-frame camera lens with breath-free shutter release, characterized in that: From the object side to the imaging plane, the lens group consists of a first lens group (G1), a variable aperture, a second lens group (G2), and a third lens group (G3). The first lens group (G1) is a fixed group with positive optical power, including the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7) and the eighth lens (8); The second lens group (G2) serves as the focusing group, with positive optical power, and includes a ninth lens (9) and a tenth lens (10), wherein the ninth lens (9) is an aspherical glass lens; The third lens group (G3) is a fixed group with negative optical power, including the eleventh lens (11), the twelfth lens (12) and the thirteenth lens (13); The first lens (1) is a meniscus negative lens that bends toward the image plane and satisfies the following conditions: -4<(L1R2+L1R1) / (L1R2-L1R1)<-1.5 Wherein, L1R1 is the radius of curvature of the side of the first lens (1) near the object side, and L1R2 is the radius of curvature of the side of the first lens (1) near the imaging surface.

2. The 24mm full-frame camera lens with breath-free shutter speed according to claim 1, characterized in that: The third lens (3) is a meniscus positive lens that bends toward the image plane and satisfies the following conditions: Nd3>1.77 4.4 <F3 / f<7.1 Wherein, Nd3 is the refractive index of the third lens (3), F3 is the focal length of the third lens (3), and f is the focal length of the camera lens optical system.

3. A 24mm full-frame camera lens with breath-free shutter speed according to claim 1, characterized in that: At least two lenses in the first lens group (G1) satisfy the following condition: Vd>70 Wherein, Vd is the Abbe number of the lens material in the first lens group (G1).

4. A 24mm full-frame camera lens with breath-free shutter speed according to claim 1, characterized in that: The focal length of the first lens group (G1) satisfies the following condition: 0.59 <FG1 / f<2.43 Wherein, FG1 is the focal length of the first lens group (G1), and f is the focal length of the camera lens optical system.

5. A 24mm full-frame camera lens with breath-free imaging as described in claim 1, characterized in that: The first lens in the second lens group (G2) is an aspherical meniscus negative lens that bends toward the object surface and satisfies the following conditions: |L9R1| / f<0.7 Wherein, L9R1 is the radius of curvature of the side of the first lens in the second lens group (G2) closest to the object, and f is the focal length of the camera lens optical system.

6. A 24mm full-frame camera lens with breath-free shutter speed according to claim 1, characterized in that: The focal length of the second lens group (G2) satisfies the following condition: 1.21 <FG2 / f<2.79 Where FG2 is the focal length of the second lens group (G2), and f is the focal length of the camera lens optical system.

7. A 24mm full-frame camera lens with breath-free shutter speed according to claim 1, characterized in that: At least one lens in the third lens group (G3) satisfies the following condition: Vd>70.4 Wherein, Vd is the Abbe number of the lens material in the third lens group (G3).

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