CN213633974U - Magnifying lens type optical lens - Google Patents
Magnifying lens type optical lens Download PDFInfo
- Publication number
- CN213633974U CN213633974U CN202022431852.XU CN202022431852U CN213633974U CN 213633974 U CN213633974 U CN 213633974U CN 202022431852 U CN202022431852 U CN 202022431852U CN 213633974 U CN213633974 U CN 213633974U
- Authority
- CN
- China
- Prior art keywords
- lens
- optical
- image
- lens group
- convex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model relates to an optical lens of magnifying glass formula, its technical essential is, contains according to the preface by thing side to image side along the optical axis: the lens comprises a first lens group and a second lens group consisting of four lenses; and the following conditional expressions are satisfied: HFOV <22 °; EFL > 3.6; HFOV2/HFOV > 1.5; EFL/F2>1.5, wherein, HFOV is half of the maximum field angle of the optical lens, EFL is the total effective focal length of the optical lens, HFOV2 is half of the maximum field angle of the second lens group as an independent lens, and F2 is the effective focal length of the second lens group. The utility model discloses a two lens group's form both can satisfy the shooting demand of the little focus of big visual field, can satisfy the requirement of the big focus of little visual field again to this realizes the characteristics of the similar magnifying glass of camera lens, realizes optical lens's diversification and multi-functional.
Description
Technical Field
The utility model relates to an optical system, concretely relates to optical lens of magnifying glass formula, applicable in portable electronic product such as cell-phone.
Background
Along with the rapid development of the mobile phone, the mobile phone realizes multiple shooting functions by adding different lenses, so that the using number of the lenses in the mobile phone is greatly increased, the attractiveness of the mobile phone is influenced, and the using cost of the lenses in the mobile phone manufacturing is increased.
Disclosure of Invention
The utility model aims at providing a dispose reasonable, convenient to use's magnifying glass formula's optical lens, adopt the form of two lens groups, both can satisfy the shooting demand of the little focus of big visual field, can satisfy the requirement of the big focus of little visual field again to this realizes the characteristics of the similar magnifying glass of camera lens, realizes optical lens's diversification and multi-functional.
The technical scheme of the utility model is that:
a magnifying lens type optical lens comprises, in order from an object side to an image side along an optical axis: the lens comprises a first lens group and a second lens group consisting of four lenses; and the following conditional expressions are satisfied:
HFOV<22°
EFL>3.6
HFOV2/HFOV>1.5
EFL/F2>1.5
the HFOV is a half of the maximum field angle of the optical lens, the EFL is the total effective focal length of the optical lens, the HFOV2 is a half of the maximum field angle of the second lens group as an independent lens, and the F2 is the effective focal length of the second lens group.
The magnifying lens type optical lens further satisfies the following conditional expressions:
HFOV2>39°
F2>2.2
wherein, HFOV2 is half of the maximum field angle of the second lens group as an independent lens, and F2 is the effective focal length of the second lens group.
In the above magnifying lens type optical lens, the diaphragm is located at the object side of the second lens group or in the second lens group.
In the magnifying lens type optical lens system, the first lens group includes four lenses, namely, a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the first lens E1 has positive focal power, the first lens object-side surface S1 is convex, and the first lens image-side surface S2 is concave; the second lens E2 has positive focal power, the second lens object-side surface S3 is convex, and the second lens image-side surface S4 is convex; the third lens E3 has positive focal power, the third lens object-side surface S5 is convex, and the third lens image-side surface S6 is convex; the fourth lens element E4 has negative power, and the fourth lens element has a concave object-side surface S7 and a concave image-side surface S8.
In the magnifying lens type optical lens system, the four lenses of the second lens group are the fifth lens element E5, the sixth lens element E6, the seventh lens element E7 and the eighth lens element E8; the fifth lens E5 has positive focal power, the fifth lens object-side surface S10 is convex, and the fifth lens image-side surface S11 is concave; the sixth lens element E6 has negative power, and the sixth lens element object-side surface S12 is concave and the sixth lens element image-side surface S13 is concave; the seventh lens element E7 has positive power, the seventh lens element object-side surface S14 is concave, and the seventh lens element image-side surface S15 is convex; the eighth lens element E8 has negative power, and the eighth lens element object-side surface S16 is convex and the eighth lens element image-side surface S17 is concave.
The utility model has the advantages that:
the whole optical lens adopts two lens groups with the same optical axis, and when the whole optical lens is used, the shooting requirements of large field of view and small focal length are met by reasonably distributing the focal length, the field angle, the diaphragm position and the like of each lens; meanwhile, the second lens group can be independently used, such as a flip phone or a flip watch, the first lens group is positioned on the cover body, and the second lens group is independently used behind the flip, so that the requirement of a small field of view and a large focal length is met, the characteristic that the lens is similar to a magnifier is realized, and the diversification and the multifunction of the optical lens are realized.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to embodiment 1 of the present invention;
fig. 2A is an on-axis chromatic aberration curve of the optical lens of embodiment 1;
fig. 2B is an astigmatism curve of the optical lens of embodiment 1;
fig. 2C is a distortion curve of the optical lens of embodiment 1;
fig. 2D is a chromatic aberration of magnification curve of the optical lens of embodiment 1;
fig. 3 is a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention;
fig. 4A is an on-axis chromatic aberration curve of the optical lens of embodiment 2;
fig. 4B is an astigmatism curve of the optical lens of embodiment 2;
fig. 4C is a distortion curve of the optical lens of embodiment 2;
fig. 4D is a chromatic aberration of magnification curve of the optical lens of embodiment 2.
In the figure: E1. a first lens, an e2. second lens, an E3. third lens, a E4. fourth lens, an sto. stop, a E5. fifth lens, a E6. sixth lens, a E7. seventh lens, a E8. eighth lens, and a E9. filter.
Detailed Description
Example 1
As shown in fig. 1, the magnifying lens optical lens, in order from an object side to an image side along an optical axis, includes: the lens comprises a first lens group and a second lens group consisting of four lenses.
In this embodiment, the first lens group includes four lenses, namely a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the first lens E1 has positive focal power, the first lens object-side surface S1 is convex, and the first lens image-side surface S2 is concave; the second lens E2 has positive focal power, the second lens object-side surface S3 is convex, and the second lens image-side surface S4 is convex; the third lens E3 has positive focal power, the third lens object-side surface S5 is convex, and the third lens image-side surface S6 is convex; the fourth lens element E4 has negative power, and the fourth lens element has a concave object-side surface S7 and a concave image-side surface S8. The four lenses of the second lens group are respectively the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8; the fifth lens E5 has positive focal power, the fifth lens object-side surface S10 is convex, and the fifth lens image-side surface S11 is concave; the sixth lens element E6 has negative power, and the sixth lens element object-side surface S12 is concave and the sixth lens element image-side surface S13 is concave; the seventh lens element E7 has positive power, the seventh lens element object-side surface S14 is concave, and the seventh lens element image-side surface S15 is convex; the eighth lens element E8 has negative power, and the eighth lens element object-side surface S16 is convex and the eighth lens element image-side surface S17 is concave. The diaphragm is located at the object side of the second lens group or in the second lens group. The optical lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image forming surface. The light from the object passes through the respective lens surfaces S1 to S19 in order and is finally imaged on the imaging plane S20.
The magnifying lens type optical lens meets the following conditional expression:
HFOV<22°
EFL>3.6
HFOV2>39°
F2>2.2
the HFOV is a half of the maximum field angle of the optical lens, the EFL is the total effective focal length of the optical lens, the HFOV2 is a half of the maximum field angle of the second lens group as an independent lens, and the F2 is the effective focal length of the second lens group.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical lens of example 1, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 1
As can be seen from table 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. In the present embodiment, the surface shape of each aspheric lens can be defined using, but not limited to, the following aspheric formula:
wherein chi is the rise of the distance from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); a. theiIs the correction coefficient of the i-th order of the aspherical surface. The high-order coefficient coefficients A4, A6, A8, A10, A12, A14 and A16 usable for each of the aspherical mirror surfaces S1-S10 in example 1 are given in Table 2 below.
TABLE 2
Table 3 shows the total effective focal length EFL of the optical lens, the effective focal lengths f1 to f8 of the first to eighth lenses, the total optical length TTL of the optical lens, half of the maximum field angle HFOV of the optical lens, and half of the maximum field angle HFOV2 of the second lens group as an independent lens in example 1.
TABLE 3
| f1(mm) | 61.671003 | EFL(mm) | 3.64 |
| f2(mm) | 10.292341 | TTL(mm) | 8.35924 |
| f3(mm) | 11.209549 | HFOV(°) | 21.92 |
| f4(mm) | -3.672506 | F2(mm) | 2.28 |
| f5(mm) | 2.416077 | HFOV2(°) | 39.1° |
| f6(mm) | -7.267794 | HFOV2/HFOV | 1.7 |
| f7(mm) | 1.575004 | EFL/F2 | 1.59 |
| f8(mm) | -1.614527 |
Fig. 2A shows an on-axis chromatic aberration curve of the optical lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical lens of embodiment 1. Fig. 2C shows a distortion curve of the optical lens of embodiment 1, which represents the distortion magnitude values in the case of different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical lens of embodiment 1, which represents a deviation of different image heights on an image plane after light passes through the lens. As can be seen from fig. 2A to 2D, the optical lens system of embodiment 1 can achieve good imaging quality.
Example 2
As shown in fig. 3, the magnifying lens optical lens, in order from an object side to an image side along an optical axis, includes: the lens comprises a first lens group and a second lens group consisting of four lenses. The configurations of the first lens group and the second lens group are the same as those of embodiment 1, and a description similar to that of embodiment 1 is omitted for the sake of brevity.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical lens of example 2, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 4
Table 5 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 5
Table 6 shows the total effective focal length EFL of the optical lens, the effective focal lengths f1 to f8 of the first to eighth lenses, the total optical length TTL of the optical lens, half of the maximum field angle HFOV of the optical lens, and half of the maximum field angle HFOV2 of the second lens group as an independent lens in example 2.
| f1(mm) | 63.924787 | EFL(mm) | 3.601 |
| f2(mm) | 10.348914 | TTL(mm) | 8.31627 |
| f3(mm) | 11.252323 | HFOV(°) | 21.99 |
| f4(mm) | -3.733706 | F2(mm) | 2.28 |
| f5(mm) | 2.416077 | HFOV2(°) | 39.1 |
| f6(mm) | -7.267794 | HFOV2/HFOV | 1.77 |
| f7(mm) | 1.575004 | EFL/F2 | 1.57 |
| f8(mm) | -1.614527 |
Fig. 4A shows an on-axis chromatic aberration curve of the optical lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical lens of embodiment 2. Fig. 4C shows a distortion curve of the optical lens of embodiment 2, which represents the distortion magnitude values in the case of different viewing angles. Fig. 4D shows a chromatic aberration of magnification curve of the optical lens of embodiment 2, which represents a deviation of different image heights on an image plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical lens system of embodiment 2 can achieve good imaging quality.
Claims (5)
1. A magnifying lens type optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens group and a second lens group consisting of four lenses; and the following conditional expressions are satisfied:
HFOV<22°
EFL>3.6
HFOV2/HFOV>1.5
EFL/F2>1.5
the HFOV is a half of the maximum field angle of the optical lens, the EFL is the total effective focal length of the optical lens, the HFOV2 is a half of the maximum field angle of the second lens group as an independent lens, and the F2 is the effective focal length of the second lens group.
2. A magnifying lens type optical lens according to claim 1, further satisfying the following conditional expression:
HFOV2>39°
F2>2.2
wherein, HFOV2 is half of the maximum field angle of the second lens group as an independent lens, and F2 is the effective focal length of the second lens group.
3. A magnifying optical lens according to claim 1, wherein: the diaphragm is located at the object side of the second lens group or in the second lens group.
4. A magnifying optical lens according to claim 1, wherein: the first lens group consists of four lenses, namely a first lens (E1), a second lens (E2), a third lens (E3) and a fourth lens (E4); the first lens (E1) has positive optical power, the first lens object side surface (S1) is convex, and the first lens image side surface (S2) is concave; the second lens (E2) has positive focal power, the second lens object-side surface (S3) is convex, and the second lens image-side surface (S4) is convex; the third lens (E3) has positive focal power, the third lens object-side surface (S5) is convex, and the third lens image-side surface (S6) is convex; the fourth lens (E4) has negative power, the fourth lens object-side surface (S7) is concave, and the fourth lens image-side surface (S8) is concave.
5. A magnifying optical lens according to claim 1, wherein: the four lenses of the second lens group are respectively a fifth lens (E5), a sixth lens (E6), a seventh lens (E7) and an eighth lens (E8); the fifth lens (E5) has positive optical power, the fifth lens object-side surface (S10) is convex, and the fifth lens image-side surface (S11) is concave; the sixth lens (E6) has negative focal power, the sixth lens object-side surface (S12) is a concave surface, and the sixth lens image-side surface (S13) is a concave surface; the seventh lens (E7) has positive focal power, the seventh lens object-side surface (S14) is a concave surface, and the seventh lens image-side surface (S15) is a convex surface; the eighth lens (E8) has negative power, the eighth lens object-side surface (S16) is convex, and the eighth lens image-side surface (S17) is concave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022431852.XU CN213633974U (en) | 2020-10-28 | 2020-10-28 | Magnifying lens type optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022431852.XU CN213633974U (en) | 2020-10-28 | 2020-10-28 | Magnifying lens type optical lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213633974U true CN213633974U (en) | 2021-07-06 |
Family
ID=76626157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022431852.XU Active CN213633974U (en) | 2020-10-28 | 2020-10-28 | Magnifying lens type optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213633974U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488475A (en) * | 2021-12-29 | 2022-05-13 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
-
2020
- 2020-10-28 CN CN202022431852.XU patent/CN213633974U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488475A (en) * | 2021-12-29 | 2022-05-13 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
| CN114488475B (en) * | 2021-12-29 | 2023-09-05 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110007444B (en) | Optical imaging lens | |
| CN107490841B (en) | Image pickup lens group | |
| CN110554484A (en) | Optical imaging system | |
| CN109031620B (en) | Optical imaging lens group | |
| CN209979916U (en) | Optical imaging system | |
| CN111505805A (en) | Image pickup lens assembly | |
| CN211086748U (en) | Optical imaging lens | |
| CN110208925B (en) | Optical imaging lens | |
| US11953655B2 (en) | Optical imaging system | |
| CN211318862U (en) | Optical imaging lens | |
| CN112748545B (en) | Optical imaging lens | |
| CN211014809U (en) | Optical imaging system | |
| CN110515186B (en) | Optical imaging lens | |
| CN112130286A (en) | Optical imaging lens | |
| CN210015278U (en) | Optical imaging lens | |
| CN111552059A (en) | Optical imaging lens | |
| CN214623165U (en) | Optical imaging lens | |
| CN212623295U (en) | Optical imaging lens | |
| CN111352210A (en) | Imaging lens | |
| CN211857037U (en) | Image pickup lens assembly | |
| CN211857034U (en) | Optical imaging lens | |
| CN211043778U (en) | Optical imaging system | |
| CN211086762U (en) | Image pickup lens assembly | |
| CN210924083U (en) | Optical imaging lens | |
| CN210119628U (en) | Optical imaging lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A magnifier type optical lens Effective date of registration: 20220929 Granted publication date: 20210706 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2022210000157 |