CN117970616A - Optical system lens and imaging device - Google Patents
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- CN117970616A CN117970616A CN202410364591.4A CN202410364591A CN117970616A CN 117970616 A CN117970616 A CN 117970616A CN 202410364591 A CN202410364591 A CN 202410364591A CN 117970616 A CN117970616 A CN 117970616A
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Abstract
The invention discloses an optical system lens and an imaging device, and belongs to the field of optics. An optical system lens sequentially comprises a first fixed lens group with positive focal power, a focusing lens group with negative focal power and a second fixed lens group with positive focal power from an object plane side to an image plane side; the optical system lens satisfies the following conditions: -7.5 < f1/f < -5.3; -5.9 < f2/f < -3.1; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the lens of the optical system. The invention can collect the incident light of the lens, control the light path of the lens, reduce the volume of the lens and balance the aberration generated when the light passes through the diaphragm.
Description
Technical Field
The present invention relates to the field of optics, and in particular, to an optical system lens and an imaging device.
Background
The fixed focus lens has the characteristics of large aperture, good imaging quality, low price and the like, and is widely applied to the field of security protection. In some scenes in the security field, due to the limitation of the installation environment, higher requirements are put on miniaturization of the lens, however, the corresponding lens is larger in size at present, and the requirements are difficult to meet.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an optical system lens and an imaging device.
The aim of the invention is realized by the following technical scheme:
The first aspect of the present invention discloses an optical system lens, which is composed of a first fixed lens group with positive focal power, a focusing lens group with negative focal power and a second fixed lens group with positive focal power in order from an object plane side to an image plane side;
the first fixed lens group comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power in sequence from the object plane side to the image plane side;
The focusing lens group consists of a seventh lens with negative focal power and an eighth lens with positive focal power;
The second fixed lens group comprises a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with positive focal power, a twelfth lens with negative focal power and a thirteenth lens with positive focal power in sequence from the object plane side to the image plane side;
The optical system lens satisfies the following conditions:
-7.5＜f1/f＜-5.3；
-5.9＜f2/f＜-3.1；
Wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the lens of the optical system.
Further, the first lens, the third lens, the fourth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens are all spherical lenses, and the second lens, the fifth lens, the sixth lens and the thirteenth lens are all aspherical lenses.
Further, the seventh lens and the eighth lens are cemented to form a cemented lens, the ninth lens and the tenth lens are cemented to form a cemented lens, and the eleventh lens and the twelfth lens are cemented to form a cemented lens.
Further, the optical system lens satisfies the following conditions:
15.5＜TTL/f＜16.5；
wherein TTL is the total optical length of the lens of the optical system.
Further, the optical system lens satisfies the following conditions:
P3＜0.5mm；
wherein P3 is the sum of the air gaps between the lenses in the second fixed lens group.
Further, the optical system lens satisfies the following conditions:
-4.5＜fg2/f＜-3.0；
Where fg2 is the combined focal length of the focusing lens group.
Further, the optical system lens satisfies the following conditions:
-0.9＜R011/f1＜--0.1；
wherein R011 is the radius of curvature of the object side of the first lens.
Further, the refractive index of the seventh lens is 1.9, and the abbe number of the seventh lens is 31.32.
Further, the refractive index of the eighth lens is 1.95, and the abbe number of the eighth lens is 17.94.
A second aspect of the present invention discloses an image forming apparatus including:
an optical system lens according to a first aspect of the present invention;
And an imaging element configured to receive an image formed by the optical system lens.
The beneficial effects of the invention are as follows:
(1) The invention can converge the incident light of the lens, control the light path of the lens, reduce the volume of the lens and balance the aberration generated when the light passes through the diaphragm by limiting the structure and the parameters;
(2) The invention can ensure the high-quality imaging effect of the lens while realizing the miniaturization of the lens of the optical system by optimizing the optical total length and the focal length;
(3) The invention is beneficial to reducing the volume of the lens of the optical system by using the aspheric lens in the first fixed lens group and the second fixed lens group.
Drawings
FIG. 1 is a schematic view of a first optical lens system according to the present invention;
FIG. 2 is a coma diagram of a lens of a first optical system according to the present invention;
FIG. 3 is an aberration diagram of a lens of a first optical system according to the present invention;
FIG. 4 is a schematic diagram of a lens assembly of a second optical system according to the present invention;
FIG. 5 is a coma diagram of a lens of a second optical system according to the present invention;
FIG. 6 is an aberration diagram of a lens of a second optical system according to the present invention;
FIG. 7 is a schematic diagram of a third optical lens system according to the present invention;
FIG. 8 is a coma diagram of a third optical system lens according to the present invention;
FIG. 9 is an aberration diagram of a third optical system lens according to the present invention;
In the figure, a 1-first lens, a 2-second lens, a 3-third lens, a 4-fourth lens, a 5-fifth lens, a 6-sixth lens, a 7-seventh lens, a 8-eighth lens, a 9-ninth lens, a 10-tenth lens, a 11-eleventh lens, a 12-twelfth lens, a 13-thirteenth lens, STO-stop, G1-first fixed lens group, G2-focusing lens group, G3-second fixed lens group.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
Referring to fig. 1 to 9, the present invention provides an optical system lens and an imaging device:
Example 1
As shown in fig. 1, the optical system lens is composed of a first fixed lens group G1 with positive power, a focusing lens group G2 with negative power, and a second fixed lens group G3 with positive power in order from the object plane side to the image plane side.
The first fixed lens group G1 is composed of, in order from the object plane side to the image plane side, a first lens a1 of negative power, a second lens a2 of negative power, a third lens a3 of negative power, a fourth lens a4 of positive power, a fifth lens a5 of negative power, and a sixth lens a6 of positive power.
The focusing lens group G2 is composed of a seventh lens a7 of negative power and an eighth lens a8 of positive power.
The second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a ninth lens a9 of negative power, a tenth lens a10 of positive power, an eleventh lens a11 of positive power, a twelfth lens a12 of negative power, and a thirteenth lens a13 of positive power.
The optical system lens satisfies the following conditions:
-7.5＜f1/f＜-5.3；
-5.9＜f2/f＜-3.1；
Wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the lens of the optical system.
In this embodiment, through the above structure and parameter limitation, the incident light of the lens can be converged, the optical path of the lens can be controlled, the volume of the lens can be reduced, and the aberration generated when the light passes through the diaphragm can be balanced.
The first lens a1, the third lens a3, the fourth lens a4, the seventh lens a7, the eighth lens a8, the ninth lens a9, the tenth lens a10, the eleventh lens a11 and the twelfth lens a12 are all spherical lenses, and the second lens a2, the fifth lens a5, the sixth lens a6 and the thirteenth lens a13 are all aspherical lenses. By using the aspheric lens, the number of lenses in the optical system lens is reduced, and the volume of the optical system lens is further reduced.
The seventh lens a7 and the eighth lens a8 are cemented to form a cemented lens, the ninth lens a9 and the tenth lens a10 are cemented to form a cemented lens, and the eleventh lens a11 and the twelfth lens a12 are cemented to form a cemented lens. By using a cemented lens, reflection and scattering between lenses are reduced, a wider field of view is possible, and better environmental adaptation is achieved.
The optical system lens satisfies the following conditions:
15.5＜TTL/f＜16.5；
wherein TTL is the total optical length of the lens of the optical system.
By optimizing the configuration of TTL/f, the miniaturization of the lens of the optical system can be realized, and the lens can be ensured to have high-quality imaging effect.
The optical system lens satisfies the following conditions:
P3＜0.5mm；
wherein P3 is the sum of the air gaps between the lenses in the second fixed lens group G3. In the embodiment, P3 is smaller than 0.5mm, so that the structure of the lens of the optical system is more compact, and the volume of the lens is reduced.
The optical system lens satisfies the following conditions:
-4.5＜fg2/f＜-3.0；
Where fg2 is the combined focal length of the focusing lens group.
By optimally configuring fg2/f, the imaging quality of the lens is improved.
The optical system lens satisfies the following conditions:
-0.9＜R011/f1＜--0.1；
wherein R011 is the radius of curvature of the object side of the first lens.
By optimally configuring R011/f01, light rays with larger angles can stably enter the optical system lens, so that the angle of view of the optical system lens is enlarged, and the imaging stability is improved.
The refractive index of the seventh lens a7 is 1.9, and the abbe number of the seventh lens a7 is 31.32.
The refractive index of the eighth lens a8 is 1.95, and the abbe number of the eighth lens a8 is 17.94.
Example two
As shown in fig. 1 to 3, the optical system lens is composed of a first fixed lens group G1 with positive power, a focusing lens group G2 with negative power, and a second fixed lens group G3 with positive power in order from the object plane side to the image plane side.
The first fixed lens group G1 is composed of, in order from the object plane side to the image plane side, a first lens a1 of negative power, a second lens a2 of negative power, a third lens a3 of negative power, a fourth lens a4 of positive power, a fifth lens a5 of negative power, and a sixth lens a6 of positive power.
The focusing lens group G2 is composed of a seventh lens a7 of negative power and an eighth lens a8 of positive power.
The second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a ninth lens a9 of negative power, a tenth lens a10 of positive power, an eleventh lens a11 of positive power, a twelfth lens a12 of negative power, and a thirteenth lens a13 of positive power.
The basic lens data of the optical system lens of the present embodiment are shown in table 1, and the aspherical coefficients are shown in tables 2 and 3.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In tables 2 and 3, K is a conic coefficient; in tables 1 to 3, E is a scientific count number, for example E-05 represents 10 -5.
TABLE 1
TABLE 2
TABLE 3 Table 3
In this embodiment, the focal length of the optical system lens is 13.30mm, the FNO is 1.26, the half angle is 42.24 degrees, the TTL is 210.00mm, and the STP to IMG is 127.97mm, wherein FNO is the f-number of the optical system lens, and TTL is the total optical length of the optical system lens.
f1/f=-76.52mm/13.3mm=-5.75；
-7.5＜f1/f＜-5.3；
Wherein f1 is the focal length of the first lens, and f is the focal length of the lens of the optical system.
f2/f=-77.66mm/13.3mm=-5.84；
-5.9＜f2/f＜-3.1；
Wherein f2 is the focal length of the second lens, and f is the focal length of the lens of the optical system.
Example III
As shown in fig. 4 to 6, the optical system lens is composed of a first fixed lens group G1 with positive power, a focusing lens group G2 with negative power, and a second fixed lens group G3 with positive power in order from the object plane side to the image plane side.
The first fixed lens group G1 is composed of, in order from the object plane side to the image plane side, a first lens a1 of negative power, a second lens a2 of negative power, a third lens a3 of negative power, a fourth lens a4 of positive power, a fifth lens a5 of negative power, and a sixth lens a6 of positive power.
The focusing lens group G2 is composed of a seventh lens a7 of negative power and an eighth lens a8 of positive power.
The second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a ninth lens a9 of negative power, a tenth lens a10 of positive power, an eleventh lens a11 of positive power, a twelfth lens a12 of negative power, and a thirteenth lens a13 of positive power.
The basic lens data of the optical system lens of the present embodiment are shown in table 4, and the aspherical coefficients are shown in tables 5 and 6.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In tables 5 and 6, K is the conic coefficient; in tables 4 to 6, E is a scientific count number, for example E-05 represents 10 -5.
TABLE 4 Table 4
TABLE 5
TABLE 6
In this embodiment, the focal length of the optical system lens is 15.15mm, the FNO is 1.47, the half angle is 37.83 degrees, the TTL is 244.89mm, and the STP to IMG is 110.62mm, wherein FNO is the f-number of the optical system lens, and TTL is the total optical length of the optical system lens.
f1/f=-106.69mm/15.15mm=-7.04；
-7.5＜f1/f＜-5.3；
Wherein f1 is the focal length of the first lens, and f is the focal length of the lens of the optical system.
f2/f=-51.86mm/15.15mm=-3.42；
-5.9＜f2/f＜-3.1；
Wherein f2 is the focal length of the second lens, and f is the focal length of the lens of the optical system.
Example IV
As shown in fig. 7 to 9, the optical system lens is composed of a first fixed lens group G1 of positive power, a focusing lens group G2 of negative power, and a second fixed lens group G3 of positive power in this order from the object plane side to the image plane side.
The first fixed lens group G1 is composed of, in order from the object plane side to the image plane side, a first lens a1 of negative power, a second lens a2 of negative power, a third lens a3 of negative power, a fourth lens a4 of positive power, a fifth lens a5 of negative power, and a sixth lens a6 of positive power.
The focusing lens group G2 is composed of a seventh lens a7 of negative power and an eighth lens a8 of positive power.
The second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a ninth lens a9 of negative power, a tenth lens a10 of positive power, an eleventh lens a11 of positive power, a twelfth lens a12 of negative power, and a thirteenth lens a13 of positive power.
The basic lens data of the optical system lens of the present embodiment are shown in table 7, and the aspherical coefficients are shown in tables 8 and 9.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In tables 8 and 9, K is the conic coefficient; in tables 7 to 9, E is a scientific count number, for example E-05 represents 10 -5.
TABLE 7
TABLE 8
TABLE 9
In this embodiment, the focal length of the optical system lens is 15.15mm, the FNO is 1.47, the half angle is 34.86 degrees, the TTL is 244.89mm, and the STP to IMG is 156.13mm, wherein FNO is the f-number of the optical system lens, and TTL is the total optical length of the optical system lens.
f1/f=-83.07mm/15.15mm=-5.48；
-7.5＜f1/f＜-5.3；
Wherein f1 is the focal length of the first lens, and f is the focal length of the lens of the optical system.
f2/f=-64.94mm/15.15mm=-4.29；
-5.9＜f2/f＜-3.1；
Wherein f2 is the focal length of the second lens, and f is the focal length of the lens of the optical system.
Example five
An image forming apparatus comprising: an optical system lens as described in any one of the above embodiments; and an imaging element configured to receive an image formed by the optical system lens.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (10)
1. An optical system lens is characterized by comprising a first fixed lens group with positive focal power, a focusing lens group with negative focal power and a second fixed lens group with positive focal power in sequence from an object plane side to an image plane side;
the first fixed lens group comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power in sequence from the object plane side to the image plane side;
The focusing lens group consists of a seventh lens with negative focal power and an eighth lens with positive focal power;
The second fixed lens group comprises a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with positive focal power, a twelfth lens with negative focal power and a thirteenth lens with positive focal power in sequence from the object plane side to the image plane side;
The optical system lens satisfies the following conditions:
-7.5＜f1/f＜-5.3；
-5.9＜f2/f＜-3.1；
Wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the lens of the optical system.
2. The optical system lens of claim 1, wherein the first lens, the third lens, the fourth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens are spherical lenses, and the second lens, the fifth lens, the sixth lens and the thirteenth lens are aspherical lenses.
3. An optical system lens according to claim 1, wherein the seventh lens and the eighth lens are cemented to form a cemented lens, the ninth lens and the tenth lens are cemented to form a cemented lens, and the eleventh lens and the twelfth lens are cemented to form a cemented lens.
4. An optical system lens according to claim 1, wherein the optical system lens satisfies the following condition:
15.5＜TTL/f＜16.5；
wherein TTL is the total optical length of the lens of the optical system.
5. An optical system lens according to claim 1, wherein the optical system lens satisfies the following condition:
P3＜0.5mm；
wherein P3 is the sum of the air gaps between the lenses in the second fixed lens group.
6. An optical system lens according to claim 1, wherein the optical system lens satisfies the following condition:
-4.5＜fg2/f＜-3.0；
Where fg2 is the combined focal length of the focusing lens group.
7. An optical system lens according to claim 1, wherein the optical system lens satisfies the following condition:
-0.9＜R011/f1＜--0.1；
wherein R011 is the radius of curvature of the object side of the first lens.
8. An optical system lens according to claim 1, wherein the refractive index of the seventh lens is 1.9 and the abbe number of the seventh lens is 31.32.
9. An optical system lens according to claim 1, wherein the refractive index of the eighth lens is 1.95 and the abbe number of the eighth lens is 17.94.
10. An image forming apparatus, comprising:
The optical system lens according to any one of claims 1 to 9;
And an imaging element configured to receive an image formed by the optical system lens.
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| JP2020056865A (en) * | 2018-10-01 | 2020-04-09 | キヤノン株式会社 | Optical system and image capturing device having the same |
| CN113126267A (en) * | 2021-05-21 | 2021-07-16 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN113655605A (en) * | 2021-08-23 | 2021-11-16 | 嘉兴中润光学科技股份有限公司 | Magnifying lens, optical system and imaging device |
| CN216210202U (en) * | 2021-09-26 | 2022-04-05 | 嘉兴中润光学科技股份有限公司 | Film lens and imaging device |
| JP2023074094A (en) * | 2021-11-17 | 2023-05-29 | 株式会社シグマ | Optical system |
| US20230384569A1 (en) * | 2022-05-31 | 2023-11-30 | Panasonic Intellectual Property Management Co., Ltd. | Imaging optical system, image capture device, and camera system |
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