CN112285890A - Super large light ring camera lens and have its digital camera, video camera - Google Patents

Super large light ring camera lens and have its digital camera, video camera Download PDF

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Publication number
CN112285890A
CN112285890A CN202011235405.5A CN202011235405A CN112285890A CN 112285890 A CN112285890 A CN 112285890A CN 202011235405 A CN202011235405 A CN 202011235405A CN 112285890 A CN112285890 A CN 112285890A
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lens group
lens
group
large aperture
infinity
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李大勇
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Anhui Changgeng Optics Technology Co ltd
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Anhui Changgeng Optics Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses

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Abstract

The invention belongs to the technical field of optical devices, and particularly relates to an ultra-large aperture lens and a digital camera and a video camera with the same, wherein the ultra-large aperture lens sequentially comprises a first lens group with negative diopter, a second lens group with positive diopter and a third lens group with positive diopter from an object side to an image surface side, and a diaphragm is arranged between the second lens group and the third lens group; the surface of the second lens group closest to the image plane side is a concave surface, and the surface of the third lens group closest to the object side is a concave surface; when an object is focused from infinity to a close distance, the first lens group is fixed, the third lens group as a main focusing group moves from the image plane side to the object side, and the second lens group as an auxiliary focusing group moves to correct the image plane curvature and the spherical aberration; and satisfies the following conditional expressions: (D1+ D2)/F is more than or equal to 0.5 and less than or equal to 2.0; the absolute value of F3/F is more than or equal to 0.5 and less than or equal to 1.5; the lens with the ultra-large aperture provided by the invention can realize excellent imaging effect from infinity to a close distance, and realizes miniaturization, low cost and easy mass production.

Description

Super large light ring camera lens and have its digital camera, video camera
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to an oversized aperture lens and a digital camera and a video camera with the oversized aperture lens.
Background
At present, with the popularization of digital cameras and video cameras, the requirements of various shooting occasions are gradually diversified, especially in shooting in a dark environment, more noise can be eliminated by using a lens with an oversized aperture, and brightness and clarity of pictures are ensured.
In addition, as shown in japanese patent laid-open No. 2020122941, although the first group is fixed and the second group is moved to focus, the distance between the two groups can be changed to correct the change of the field curvature and spherical aberration, but the first group is too complicated, the entrance pupil position is too close to the image plane, the first group is bulky, the whole optical system is large, and the optimum combination effect of miniaturization and high performance cannot be achieved.
Disclosure of Invention
The invention aims to provide an ultra-large aperture lens which can well correct aberrations such as field curvature, spherical aberration and the like caused by the change of object distance and has small volume and low cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a super-large aperture lens comprises a first lens group with negative diopter, a second lens group with positive diopter and a third lens group with positive diopter in sequence from an object side to an image surface side, wherein a diaphragm is arranged between the second lens group and the third lens group;
the surface of the second lens group closest to the image surface side is a concave surface, and the surface of the third lens group closest to the object side is a concave surface;
when an object is focused from infinity to a close distance, the first lens group is fixed, the third lens group as a main focusing group moves from the image plane side to the object side, and the second lens group as an auxiliary focusing group moves to correct the image plane curvature and the spherical aberration; and satisfies the following conditional expressions:
0.5≤(D1+D2)/F≤2.0 (1)
0.5≤|F3/F|≤1.5 (2)
wherein:
d1: a spacing between the first lens group and the second lens group in an infinity state;
d2: a spacing between the second lens group and the third lens group in an infinity state;
f: focal length of the entire optical system at infinity;
f3: focal distance of the third lens group.
In a further technical scheme, the oversized aperture lens further meets the following conditional expression:
0.6≤|F1/F2|≤1.6 (3)
wherein:
f1: a focal length of the first lens group;
f2: focal distance of the second lens group.
In a further technical scheme, the oversized aperture lens further meets the following conditional expression:
2≤|F1/F|≤6 (4)
wherein:
f: focal length of the entire optical system at infinity;
f1: a focal length of the first lens group.
In the present invention, if the upper limit of the conditional expression (1) is exceeded, the interval between the first lens group, the second lens group, and the third lens group is sufficiently large, and although the space required for the in-focus movement is easily solved, the volume of the entire optical system becomes extremely large, and it is difficult to achieve the demand for miniaturization. If the lower limit of the conditional expression (1) is exceeded, miniaturization is easily achieved, but since the movement space of the focusing group is too small, it is difficult to achieve a close-range focusing function, and the degree of freedom of auxiliary focusing of the second lens group is reduced, and the ability to correct aberrations such as field curvature and spherical aberration is weakened, so that high performance requirements cannot be achieved.
If the upper limit of the conditional expression (2) is exceeded, the diopter of the third lens group will be weakened, and although it is beneficial to correct the aberration, the moving amount of the third lens group as the main focusing group will be increased, so that the volume of the whole optical system will become very large, and it is difficult to achieve the requirements of an ultra-large aperture and a small volume. If the lower limit of the conditional expression (2) is exceeded, the light intensity of the third lens group becomes strong, and although the volume can be easily controlled, since the power is too strong, more aberrations such as spherical aberration and coma aberration are generated, and high performance is hardly ensured.
If the upper limit of the conditional expression (3) is exceeded, the diopter of the first lens group will be weak or the diopter of the second lens group will become strong, so that the size can be easily miniaturized, but since the diopter of the first lens group is too weak, various aberrations of correcting the second lens group and the third lens group become weak, it becomes more difficult to achieve high performance, and it is also difficult to achieve a wide-angle effect. If the lower limit of the conditional expression (3) is exceeded, the diopter of the second lens group becomes weak, and although the aberration generated by the second lens group itself is small, the auxiliary aberration correction capability in focusing is weak, and therefore it is difficult to realize a high-performance super-large aperture effect.
If the upper limit of the conditional expression (4) is exceeded, the diopter of the first lens group becomes weak, so that the size can be easily miniaturized, but since the diopter of the first lens group is too weak, various aberrations of the second lens group and the third lens group become weak, it becomes more difficult to achieve high performance, and it is difficult to achieve a wide angle effect. If the lower limit of the conditional expression (4) is exceeded, the diopter of the first lens group becomes strong, and although good aberration correction can be achieved for the second lens group and the third lens group, too much correction causes too high tolerance sensitivity between groups, too high processing requirement, difficulty in realizing mass production, too low yield, and increased manufacturing cost.
The invention also provides a digital camera with the oversized aperture lens.
The invention also provides a camera with the oversized aperture lens.
Compared with the prior art, the ultra-large aperture lens provided by the invention can realize excellent imaging effect from infinity to close range, and is miniaturized, low in cost and easy for mass production.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a schematic structural diagram of an ultra-large aperture lens in embodiment 1;
FIG. 2 shows the infinity, close range spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification of example 1;
fig. 3 is a schematic structural diagram of an ultra-large aperture lens in embodiment 2;
FIG. 4 shows the infinity, close range spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification of example 2;
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified below by combining the specific drawings and the embodiments.
Example 1
Referring to fig. 1, the super-large aperture lens includes, in order from an object side to an image plane side, a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a stop, and a third lens group G3 with positive refractive power;
when the object is focused from infinity to close range, the first lens group G1 is fixed, and the second lens group G2 and the third lens group G3 move respectively to realize focusing.
Infinity, near spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification of example 1 are shown in fig. 2.
The aspheric formula used in this embodiment is:
Figure BDA0002762768810000041
wherein the aspheric shape defines:
y: radial coordinates from the optical axis;
z: the offset of the optical axis direction from the intersection point of the aspheric surface and the optical axis;
r: the radius of curvature of the reference sphere of the aspheric surface;
k: aspheric coefficients of 4 times, 6 times, 8 times, 10 times and 12 times.
The data for this example are as follows:
r (mm): radius of curvature of each face
D (mm): individual lens spacing and lens thickness
Nd: refractive index of each glass of d line
Vd: abbe number of glass
Example 1 optical data
Figure BDA0002762768810000042
Figure BDA0002762768810000051
Figure BDA0002762768810000052
Aspherical surface K 4(B) 6(C) 8(D) 10(E) 12(F)
22 -95.0 -4.12938E-05 -4.48879E-08 1.51208E-09 -1.05207E-11 2.11271E-14
23 0.0 1.34979E-05 -1.88126E-07 2.99514E-09 -1.80286E-11 3.71618E-14
Distance of object inf 1270
D(2) 15.2058 14.4236
D(10) 4.273 4.7242
D(23) 12.8798 13.212
Example 2
Referring to fig. 3, the super-large aperture lens includes, in order from an object side to an image plane side, a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a stop, and a third lens group G3 with positive refractive power;
when the object is focused from infinity to close range, the first lens group G1 is fixed, and the second lens group G2 and the third lens group G3 move respectively to realize focusing.
Infinity, near spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification of example 2 are shown in fig. 4.
The aspheric formula used in this embodiment is:
Figure BDA0002762768810000061
wherein the aspheric shape defines:
y: radial coordinates from the optical axis;
z: the offset of the optical axis direction from the intersection point of the aspheric surface and the optical axis;
r: the radius of curvature of the reference sphere of the aspheric surface;
k: aspheric coefficients of 4 times, 6 times, 8 times, 10 times and 12 times.
The data for this example are as follows:
r (mm): radius of curvature of each face
D (mm): lens spacing and lens thickness Nd: refractive index of each glass of d line
Vd: abbe number of glass
Example 2 optical data
Focal length 44.89
Fno 0.98
Semi-drawing angle omega 25.6°
Figure BDA0002762768810000071
Figure BDA0002762768810000081
Aspherical surface K 4(B) 6(C) 8(D) 10(E) 12(F)
22 -95.0 -5.44460E-05 1.29944E-07 -2.15045E-10 3.43403E-13 -2.08375E-15
23 0.0 -2.26938E-05 4.66871E-08 5.31197E-10 -2.34658E-12 2.67922E-15
Distance of object inf 2500
D(2) 11.6660 9.4148
D(9) 8.9660 10.3063
D(23) 12.8692 13.7801
The condition formula satisfies the condition:
conditional formula (II) Example 1 Example 2
The conditional formula (1) is that (D1+ D2)/F is more than or equal to 0.5 and less than or equal to 2.0 1.376 0.666
The conditional expression (2) is that | F3/F | is more than or equal to 0.5 and less than or equal to 1.5 1.037 0.789
The conditional expression (3) is that | F1/F2| is more than or equal to 0.6 |, and is more than or equal to 1.6 | 0.901 1.215
The conditional expression (4) is that | F1/F | < 6 > is more than or equal to 2 ≦ F1/F | 3.140 4.904
The oversized aperture lens provided by the invention solves the problems that the curvature of field and the variation of spherical aberration generated by the variation of object distance cannot be corrected by the whole focusing in the market, and the like, and the problem that the oversized aperture exchange camera lens with small volume and high performance cannot be realized due to the mode of front group fixing and back combined focusing with complex structure of the embodiment in the known patent mentioned in the background technology.
The lens with the ultra-large aperture can well correct aberrations such as field curvature, spherical aberration and the like caused by the change of the object distance, has small volume and low cost, and has better application prospect on digital cameras and video cameras.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. The super-large aperture lens is characterized by comprising a first lens group (G1) with negative diopter, a second lens group (G2) with positive diopter and a third lens group (G3) with positive diopter in sequence from the object side to the image surface side, wherein a diaphragm is arranged between the second lens group (G2) and the third lens group (G3);
the surface of the second lens group (G2) closest to the image surface side is a concave surface, and the surface of the third lens group (G3) closest to the object side is a concave surface;
when the object is focused from infinity to a close distance, the first lens group (G1) is fixed, the third lens group (G3) as a main focusing group moves from the image plane side to the object side, and the second lens group (G2) as an auxiliary focusing group moves to correct the curvature of field and the spherical aberration; and satisfies the following conditional expressions:
0.5≤(D1+D2)/F≤2.0 (1)
0.5≤|F3/F|≤1.5 (2)
wherein:
d1: a spacing of the first lens group (G1) and the second lens group (G2) in an infinity state;
d2: a spacing of the second lens group (G2) and the third lens group (G3) in an infinity state;
f: focal length of the entire optical system at infinity;
f3: a focal length of the third lens group (G3).
2. The ultra-large aperture lens according to claim 1, further satisfying the following conditional expression:
0.6≤|F1/F2|≤1.6 (3)
wherein:
f1: a focal length of the first lens group (G1);
f2: focal distance of the second lens group (G2).
3. The ultra-large aperture lens according to claim 1, further satisfying the following conditional expression:
2≤|F1/F|≤6 (4)
wherein:
f: focal length of the entire optical system at infinity;
f1: a focal length of the first lens group (G1).
4. A digital camera having the extra-large aperture lens of any one of claims 1 to 3.
5. A camera having the ultra-large aperture lens of any one of claims 1 to 3.
CN202011235405.5A 2020-11-05 2020-11-05 Super large light ring camera lens and have its digital camera, video camera Pending CN112285890A (en)

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CN202011235405.5A CN112285890A (en) 2020-11-05 2020-11-05 Super large light ring camera lens and have its digital camera, video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011235405.5A CN112285890A (en) 2020-11-05 2020-11-05 Super large light ring camera lens and have its digital camera, video camera

Publications (1)

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