CN213399041U - 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 PDFInfo
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- CN213399041U CN213399041U CN202022555387.0U CN202022555387U CN213399041U CN 213399041 U CN213399041 U CN 213399041U CN 202022555387 U CN202022555387 U CN 202022555387U CN 213399041 U CN213399041 U CN 213399041U
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Abstract
The utility model belongs to the technical field of optical devices, in particular 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 utility model provides an outstanding imaging effect can be realized to closely the homoenergetic from infinity to the super large light ring camera lens, has realized the miniaturization, and low cost, easy volume production change.
Description
Technical Field
The utility model belongs to the technical field of optical device, concretely relates to super large light ring camera lens and have its digital camera, camera.
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.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model aims to provide a super large light ring camera lens, aberrations such as field curvature, spherical aberration that this camera lens correction that can be fine arouses because of the change of object distance, and small, with low costs.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
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.
The utility model discloses in, if exceed the upper limit of conditional expression (1), the interval between first lens group, the second lens group to and the third lens group is enough big, though solve very easily and close burnt required space that moves, but whole optical system's volume will be very huge, hardly realizes miniaturized demand. 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 utility model also provides a digital camera of having above-mentioned super large light ring camera lens.
The utility model also provides a camera of having above-mentioned super large light ring camera lens.
Compared with the prior art, the utility model provides a super large light ring camera lens can realize outstanding formation of image effect from infinity to closely the homoenergetic, and has realized the miniaturization, low cost, easy volume production.
Other features and advantages of the present invention will be described in detail in the following detailed description.
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, creation features, achievement purposes and effects of the present invention easy to understand, the present invention will be further clarified by the following specific drawings and 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:
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
| 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:
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 2 optical data
| Focal length | 44.89 |
| Fno | 0.98 |
| Semi-drawing angle omega | 25.6° |
| 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 utility model provides a super large light ring camera lens has overcome on the market all focus can't correct the crooked and spherical aberration variation scheduling problem of image planes because of the object distance changes and produce to and among the well-known patent that the background art mentioned, the front group that the structure of embodiment is complicated is fixed, the burnt mode of back combination, and lead to unable realization small size, the problem of the super large light ring exchange camera lens of high performance.
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 features of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the description of the above embodiments and the description is only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications are all within the scope of the present 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022555387.0U CN213399041U (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 |
|---|---|---|---|
| CN202022555387.0U CN213399041U (en) | 2020-11-05 | 2020-11-05 | Super large light ring camera lens and have its digital camera, video camera |
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| Publication Number | Publication Date |
|---|---|
| CN213399041U true CN213399041U (en) | 2021-06-08 |
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| CN202022555387.0U Active CN213399041U (en) | 2020-11-05 | 2020-11-05 | Super large light ring camera lens and have its digital camera, video camera |
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| Country | Link |
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