CN112346229A - Full-frame optical imaging system and optical equipment thereof - Google Patents
Full-frame optical imaging system and optical equipment thereof Download PDFInfo
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- CN112346229A CN112346229A CN202011340217.9A CN202011340217A CN112346229A CN 112346229 A CN112346229 A CN 112346229A CN 202011340217 A CN202011340217 A CN 202011340217A CN 112346229 A CN112346229 A CN 112346229A
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144111—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged ++-+
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Abstract
The invention provides a full-frame optical imaging system and optical equipment thereof, which sequentially comprise from an object side to an image side: a first lens group having positive power, an aperture stop, a second lens group having positive power, a third lens group having negative power, and a fourth lens group having positive power; in the focusing process, the third lens group moves towards the image side along the optical axis, and the positions of the first lens group, the second lens group and the fourth lens group relative to the image surface are kept unchanged; the first lens group satisfies the following conditional expression: F1/F is more than or equal to 1.3 and less than or equal to 2.5, (1); the second lens group satisfies the following conditional expression: F3/F is not less than-4.5 and not more than-3.0, (2). The invention also provides an optical device provided with the full-frame optical imaging system. The focusing assembly of the imaging system only consists of one lens, so that the weight of the focusing assembly and the total weight of the optical imaging system are reduced, and the rapid focusing of the optical imaging system and the imaging equipment is facilitated.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a full-frame optical imaging system and optical equipment thereof.
Background
With the continuous development of electronic technology, the body of the digital camera becomes smaller and smaller, and the corresponding short flange distance enables the micro-single digital camera to be smaller and smaller in matching with the lens. The method brings high-performance experience and excellent convenience to consumers in various application scenes. In addition, nowadays, more and more micro single cameras are increasing their ability of high-speed shooting processing, and the high-precision high-speed focusing lens matched with the micro single cameras is being demanded by consumers. However, some of the original factory shots are expensive, and consumers also want to have some high-performance products at a reasonable price.
Disclosure of Invention
The invention provides a full-frame optical imaging system and optical equipment thereof aiming at the defects and market demands in the prior art, the full-frame optical imaging system is small in size and light in weight, an internal focusing component can be composed of only one lens, the full-frame wide-angle large-aperture optical imaging system has the characteristics of high focusing speed and excellent imaging performance, and is suitable for the full-frame wide-angle large-aperture optical imaging system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a full-frame optical imaging system includes, in order from an object side to an image side: a first lens group having positive power, an aperture stop, a second lens group having positive power, a third lens group having negative power, and a fourth lens group having positive power; in the focusing process, the third lens group moves towards the image side along the optical axis, and the positions of the first lens group, the second lens group and the fourth lens group relative to the image surface are kept unchanged;
the second lens group comprises a seventh lens with negative focal power, an eighth lens with positive focal power and a ninth lens with positive focal power which are arranged in sequence, and the seventh lens and the eighth lens are combined into a cemented lens group; the third lens group is composed of a tenth lens having negative optical power; the fourth lens group comprises an eleventh lens with positive focal power and a twelfth lens with negative focal power which are arranged in sequence;
in the above, the first lens group satisfies the following conditional expression:
1.3≤F1/F≤2.5，(1)；
where F denotes a focal length of the optical imaging system, and F1 denotes a composite focal length of the first lens group.
As a preferable mode, the third lens group satisfies the following conditional expression:
-4.5≤F3/F≤-3.0，(2)；
where F denotes a focal length of the optical imaging system, and F3 denotes a composite focal length of the third lens group.
As a preferable scheme, the following conditional expression is satisfied:
0.3≤L1S/L≤0.5，(3)；
where L1S denotes a distance from a surface of the first lens group closest to the object side to the aperture stop, and L denotes a distance from a surface of the optical imaging system closest to the object side to the image plane.
As a preferable mode, the fourth lens group satisfies the following conditional expression:
0.7≤(R1+R2)/(R1-R2)≤2.3，(4)；
wherein R1 represents a curvature radius value of the fourth lens group on the object side, and R2 represents a curvature radius value of the fourth lens group on the image side.
Preferably, the first lens group includes a first lens with negative power, a second lens with negative power, a third lens with negative power, a fourth lens with positive power and a fifth lens with positive power, which are arranged in sequence, and the third lens and the fourth lens are combined into a cemented lens group.
Preferably, the first lens group includes a first lens with negative power, a second lens with negative power, a third lens with negative power, a fourth lens with negative power, a fifth lens with positive power and a sixth lens with positive power, which are arranged in sequence, and the fourth lens and the fifth lens are combined into a cemented lens group.
Preferably, the first lens group includes a first lens with negative power, a second lens with negative power, a third lens with positive power, a fourth lens with negative power, a fifth lens with positive power and a sixth lens with positive power, which are arranged in sequence, and the fourth lens and the fifth lens are combined into a cemented lens group.
Preferably, the second lens, the eighth lens and the eleventh lens are all low-dispersion lenses having an abbe number higher than 70 for light with a wavelength of 587.6 nm.
An optical apparatus is provided with the full-frame optical imaging system described above.
Compared with the prior art, the invention has the following beneficial effects:
the focusing assembly of the optical imaging system only consists of one lens, so that the weight of the focusing group and the load of the pushing motor are reduced, and the quick focusing of the optical imaging system and the imaging equipment is facilitated. And under the condition of satisfying the conditional expressions (1) and (2), the focusing movement amount is controlled, the length change of the optical system is effectively inhibited, and the large aperture is convenient for shooting a wide scene and ensuring the edge brightness. Aspheric lenses are used to further reduce spherical aberration and off-axis aberration, while reducing the number of lenses ensures light weight of the lens.
To more clearly illustrate the structural features and technical means of the present invention and the specific objects and functions attained thereby, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1 is a schematic structural view showing embodiment 1 of the present invention;
FIG. 2 is a diagram showing spherical aberration in infinity focusing according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram showing spherical aberration at the closest in-focus distance in embodiment 1 of the present invention;
FIG. 4 shows a schematic view of the curvature of field in infinity focusing according to example 1 of the present invention;
FIG. 5 shows a distortion diagram of embodiment 1 of the present invention in infinity focusing;
FIG. 6 is a schematic view showing curvature of field at the closest in-focus distance in example 1 of the present invention;
FIG. 7 is a diagram showing distortion at the closest in-focus distance in embodiment 1 of the present invention;
FIG. 8 is a schematic structural view showing embodiment 2 of the present invention;
FIG. 9 is a diagram showing spherical aberration in infinity focusing according to embodiment 2 of the present invention;
FIG. 10 is a diagram showing spherical aberration at the closest in-focus distance in embodiment 2 of the present invention;
FIG. 11 shows a schematic view of the curvature of field in infinity focusing according to example 2 of the present invention;
FIG. 12 shows a distortion diagram of embodiment 2 of the present invention in infinity focusing;
FIG. 13 is a schematic view showing curvature of field at the closest in-focus distance in accordance with example 2 of the present invention;
FIG. 14 is a diagram showing distortion at the closest in-focus distance in embodiment 2 of the present invention;
FIG. 15 is a schematic structural view showing embodiment 3 of the present invention;
FIG. 16 is a diagram showing spherical aberration in infinity focusing according to embodiment 3 of the present invention;
FIG. 17 is a diagram showing spherical aberration at the closest in-focus distance in embodiment 3 of the present invention;
FIG. 18 shows a schematic view of the curvature of field in infinity focusing for example 3 of the present invention;
FIG. 19 shows a distortion diagram of embodiment 3 of the present invention in infinity focusing;
FIG. 20 is a schematic view showing curvature of field at the closest in-focus distance in example 3 of the present invention;
fig. 21 shows a distortion diagram at the closest in-focus distance in embodiment 3 of the present invention.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed and operated in specific orientations, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
As shown in fig. 1 to 21, a full-frame optical imaging system, in order from an object side to an image side, comprises: a first lens group G1 having positive power, an aperture stop STP, a second lens group G2 having positive power, a third lens group G3 having negative power, and a fourth lens group G4 having positive power; the third lens group G3 moves in the direction of the image side along the optical axis during focusing, and the first lens group G1, the second lens group G2, and the fourth lens group G4 remain unchanged with respect to the image plane IMG position;
the second lens group G2 comprises a seventh lens L21 with negative focal power, an eighth lens L22 with positive focal power and a ninth lens L23 with positive focal power which are arranged in sequence, and the seventh lens L21 and the eighth lens L22 are combined into a cemented lens group; the third lens group G3 is composed of a tenth lens L31 having negative optical power; the fourth lens group G4 includes an eleventh lens L41 having positive power and a twelfth lens L42 having negative power, which are disposed in this order; the eighth lens L22 and the eleventh lens L41 are low-dispersion lenses with Abbe numbers higher than 70 about light rays with the wavelength of 587.6 nm;
the first lens group G1 satisfies the following conditional expression:
1.3≤F1/F≤2.5，(1)；
where F denotes a focal length of the optical imaging system, and F1 denotes a resultant focal length of the first lens group G1.
If it is lower than the lower limit in the conditional expression (1), the negative focal length of the first lens group G1 decreases and the positive spherical aberration increases. Meanwhile, the paraxial imaging magnification of the rear group lens becomes large, and the caliber of the rear group lens is increased, which is not beneficial to the miniaturization of the lens. If the upper limit of the conditional expression (1) is exceeded, the negative focal length of the first lens group G1 increases, and the entire lens length increases, which is not favorable for downsizing the lens.
The third lens group G3 satisfies the following conditional expression:
-4.5≤F3/F≤-3.0，(2)；
where F denotes a focal length of the optical imaging system, and F3 denotes a resultant focal length of the third lens group G3.
If the value is lower than the lower limit in conditional expression (2), the negative focal length of the third lens group G3 increases, and the lens as a whole increases, and the focusing stroke also increases. If it is higher than the upper limit in the conditional expression (2), the negative focal length of the third lens group G3 will decrease, i.e., the negative power will increase. In the focusing process, the deflection angle of the light beam is greatly changed along with the aberration generated by the third lens group G3.
The optical imaging system satisfies the following conditional expression:
0.3≤L1S/L≤0.5，(3)；
where L1S denotes a distance from the object-side closest surface of the first lens group G1 to the aperture stop STP, and L denotes a distance (total optical length) from the object-side closest surface of the optical imaging system to the image plane.
If the value is lower than the lower limit in the conditional expression (3), the aperture stop STP will gradually approach the first lens group G1, the lens aperture near the image side will increase, and the off-axis aberration generated by the rear group, especially the astigmatism, will increase accordingly. If the value is higher than the upper limit in the conditional expression (3), the aperture stop STP will gradually approach the image plane, which will cause the light of the first lens group G1 to be effectively increased, and further increase the aperture of the lens, which is not favorable for the miniaturization of the lens.
The fourth lens group G4 twelfth lens L42 satisfies the following conditional expression:
0.7≤(R1+R2)/(R1-R2)≤2.3，(4)
where R1 denotes a curvature radius value of the fourth lens group G4 on the object side of the twelfth lens L42, and R2 denotes a curvature radius value of the fourth lens group G4 on the image side of the twelfth lens L42.
If the value is lower than the lower limit in the conditional expression (4), the twelfth lens L42 gradually becomes a plano-concave negative lens, which is weak in correcting the off-axis coma astigmatism. If the upper limit of the conditional expression (4) is exceeded, the twelfth lens L42 gradually becomes a meniscus negative lens, and the lens is excessively bent to be disadvantageous to lens processing.
The invention also provides optical equipment which is provided with the full-frame optical imaging system.
In the present invention, a parallel glass plate GL configured by a filter is disposed between the fourth lens group G4 and the image plane IMG. The back focal length is a distance from the image side surface of the fourth lens group G4 to the image surface IMG, where the parallel glass plate GL can transform into air.
Example 1
Fig. 1 is a schematic structural view of an optical imaging system according to embodiment 1. As shown in fig. 1, in the present embodiment, the first lens group G1 includes a first lens L11 having negative power, a second lens L12 having negative power, a third lens L13 having negative power, a fourth lens L14 having positive power, and a fifth lens L15 having positive power, which are arranged in this order, the third lens L13 and the fourth lens L14 are combined into a cemented lens group, and the second lens L12 is a low dispersion lens having an abbe number higher than 70 with respect to light having a wavelength of 587.6 nm.
The numerical data of the full frame optical imaging system are shown in tables 1, 2 and 3:
TABLE 1
TABLE 2
TABLE 3
Wherein, the surface number represents the surface number of each lens from the object side to the image side;
in embodiment 1, the object-side surface and the image-side surface at L23 and L31 are formed to be aspherical. In the following tables, the fourth, sixth, eighth, tenth order aspheric coefficients a4, a6, A8, a10 and the conic constant k of the aspheric surface are shown together.
The aspheric shape definition will be described, and the following embodiments will not be repeated to describe the aspheric shape definition:
and y is the radial coordinate from the optical axis.
z is the offset of the intersection point of the aspheric surface and the optical axis in the direction of the optical axis.
r is the curvature radius of the reference spherical surface of the aspheric surface.
K, aspheric coefficients 4, 6, 8, 10, 12, 14, 16;
the spherical aberration curve diagram shows the spherical aberration curve when the F-number is 1.4, wherein, the F line, the d line and the C line respectively represent the spherical aberration at a wave length of 486nm, a wave length of 587nm and a wave length of 656nm, the abscissa represents the size of the spherical aberration value, and the ordinate represents the normalized field of view. The field curvature graph represents a field curvature from the imaging center to the periphery, wherein a solid line S represents the value of a main ray d line on a sagittal image surface, a solid line T represents the value of the main ray d line on a meridional image surface, the abscissa represents the magnitude of the field curvature value, and the ordinate represents the field of view. The distortion curve diagram represents a distortion curve from the imaging center to the periphery, in which the abscissa represents the distortion value and the ordinate represents the field of view. The above description of various spherical aberration, curvature of field, distortion graphs is the same as other embodiments, and will not be repeated herein. FIGS. 2-3 are graphs showing spherical aberration in focusing at infinity and in focusing at closest in example 1, and FIGS. 4-7 are graphs showing curvature of field and distortion in focusing at infinity and at closest in example 1. The integral axial chromatic spherical aberration is less than 0.2mm, and the edge of a shot object is not easy to generate chromatic dispersion. The original distortion of the distance from infinity to the nearest focus is less than 2.5%, and the original distortion can be basically less than 1% by matching with the internal correction of the camera.
Example 2
Fig. 8 is a schematic structural view of the full-frame optical imaging system of embodiment 2. In this embodiment 2, the first lens group G1 includes, in order, a first lens L11 having negative power, a second lens L12 having negative power, a third lens L13 having negative power, a fourth lens L14 having negative power, a fifth lens L15 having positive power, and a sixth lens L16 having positive power, the fourth lens L14 and the fifth lens L15 are combined into a cemented lens group, and the second lens L12 is a low dispersion lens having an abbe number higher than 70 with respect to a light ray having a wavelength of 587.6 nm.
Hereinafter, table 4, table 5 and table 6 show various numerical data about the full-frame optical imaging system of the present embodiment.
TABLE 4
TABLE 5
TABLE 6
Fig. 9 to 10 show spherical aberration diagrams in focusing at infinity and in closest focus in example 2, and fig. 11 to 14 show graphs of curvature of field and distortion in focusing at infinity and in closest focus in example 2. The integral axial chromatic spherical aberration is less than 0.2mm, and the edge of a shot object is not easy to generate chromatic dispersion. The original distortion of the distance from infinity to the nearest focus is less than 2.5%, and the original distortion can be basically less than 1% by matching with the internal correction of the camera.
Example 3
Fig. 15 is a schematic structural view of the full-frame optical imaging system according to embodiment 3. In this embodiment 3, the first lens group G1 includes, in order, a first lens L11 having negative refractive power, a second lens L12 having negative refractive power, a third lens L13 having positive refractive power, a fourth lens L14 having negative refractive power, a fifth lens L15 having positive refractive power, and a sixth lens L16 having positive refractive power, the fourth lens L14 and the fifth lens L15 are combined into a cemented lens group, and the second lens L12 is a low dispersion lens having an abbe number higher than 70 with respect to a light ray having a wavelength of 587.6 nm.
Hereinafter, tables 7, 8, and 9 show various numerical data about the full-frame optical imaging system of the present embodiment.
TABLE 7
TABLE 8
TABLE 9
FIGS. 16 to 17 are graphs showing spherical aberration at infinity focusing and at closest focusing in example 3, and FIGS. 18 to 21 are graphs showing curvature of field and distortion at infinity and at closest focusing in example 3. The integral axial chromatic spherical aberration is less than 0.2mm, and the edge of a shot object is not easy to generate chromatic dispersion. The original distortion of the distance from infinity to the nearest focus is less than 2.5%, and the original distortion can be basically less than 1% by matching with the internal correction of the camera.
Table 13 shows a table of calculated values of conditional expressions 1 to 7 for each example:
watch 13
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. 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 (9)
1. A full-frame optical imaging system, comprising, in order from an object side to an image side: a first lens group having positive power, an aperture stop, a second lens group having positive power, a third lens group having negative power, and a fourth lens group having positive power; in the focusing process, the third lens group moves towards the image side along the optical axis, and the positions of the first lens group, the second lens group and the fourth lens group relative to the image surface are kept unchanged;
the second lens group comprises a seventh lens with negative focal power, an eighth lens with positive focal power and a ninth lens with positive focal power which are arranged in sequence, and the seventh lens and the eighth lens are combined into a cemented lens group; the third lens group is composed of a tenth lens having negative optical power; the fourth lens group comprises an eleventh lens with positive focal power and a twelfth lens with negative focal power which are arranged in sequence;
in the above, the first lens group satisfies the following conditional expression:
1.3≤F1/F≤2.5，(1)；
where F denotes a focal length of the optical imaging system, and F1 denotes a composite focal length of the first lens group.
2. A full frame optical imaging system according to claim 1, wherein said third lens group satisfies the following conditional expression:
-4.5≤F3/F≤-3.0，(2)；
where F denotes a focal length of the optical imaging system, and F3 denotes a composite focal length of the third lens group.
3. A full frame optical imaging system according to claim 1, wherein the following conditional expression is satisfied:
0.3≤L1S/L≤0.5，(3)；
where L1S denotes a distance from a surface of the first lens group closest to the object side to the aperture stop, and L denotes a distance from a surface of the optical imaging system closest to the object side to the image plane.
4. A full frame optical imaging system according to claim 1, wherein said fourth lens group satisfies the following conditional expression:
0.7≤(R1+R2)/(R1-R2)≤2.3，(4)；
wherein R1 represents a curvature radius value of the fourth lens group on the object side, and R2 represents a curvature radius value of the fourth lens group on the image side.
5. The full-frame optical imaging system according to claim 1, wherein the first lens group includes a first lens having a negative power, a second lens having a negative power, a third lens having a negative power, a fourth lens having a positive power, and a fifth lens having a positive power, which are arranged in this order, and the third lens and the fourth lens are combined into a cemented lens group.
6. The full-frame optical imaging system according to claim 1, wherein the first lens group includes a first lens having a negative power, a second lens having a negative power, a third lens having a negative power, a fourth lens having a negative power, a fifth lens having a positive power, and a sixth lens having a positive power, which are arranged in this order, and the fourth lens and the fifth lens are combined into a cemented lens group.
7. The full-frame optical imaging system according to claim 1, wherein the first lens group includes a first lens having a negative power, a second lens having a negative power, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, and a sixth lens having a positive power, which are arranged in this order, and the fourth lens and the fifth lens are combined into a cemented lens group.
8. A full-frame optical imaging system according to any one of claims 5 to 7, wherein the second lens, the eighth lens and the eleventh lens are all low-dispersion lenses having an Abbe number higher than 70 with respect to light with a wavelength of 587.6 nm.
9. An optical device, characterized by: the optical device is provided with a full-picture optical imaging system according to any one of claims 1 to 8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217425A (en) * | 2021-12-21 | 2022-03-22 | 安徽国芯智能装备有限公司 | Multiplying power inner adjusting lens for photoetching machine |
| CN115598804A (en) * | 2022-11-30 | 2023-01-13 | 浙江大华技术股份有限公司（Cn） | Optical lens and imaging device |
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2020
- 2020-11-25 CN CN202011340217.9A patent/CN112346229A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217425A (en) * | 2021-12-21 | 2022-03-22 | 安徽国芯智能装备有限公司 | Multiplying power inner adjusting lens for photoetching machine |
| CN114217425B (en) * | 2021-12-21 | 2024-04-09 | 安徽国芯光刻技术有限公司 | Multiplying power internal adjusting lens for photoetching machine |
| CN115598804A (en) * | 2022-11-30 | 2023-01-13 | 浙江大华技术股份有限公司（Cn） | Optical lens and imaging device |
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