CN113126263A - Ultrathin lens - Google Patents
Ultrathin lens Download PDFInfo
- Publication number
- CN113126263A CN113126263A CN202110542048.5A CN202110542048A CN113126263A CN 113126263 A CN113126263 A CN 113126263A CN 202110542048 A CN202110542048 A CN 202110542048A CN 113126263 A CN113126263 A CN 113126263A
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- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 238000003384 imaging method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000005286 illumination Methods 0.000 description 5
- 201000009310 astigmatism Diseases 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 235000013312 flour Nutrition 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention relates to the technical field of imaging, in particular to an ultrathin lens, which comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an optical filter and an image plane, wherein the diaphragm, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the optical filter and the image plane are sequentially distributed from an object side to an image side along an optical axis; the first lens has positive refractive power, and the object side surface is a convex surface; the second lens has negative refractive power, and the image side surface is a concave surface; the third lens has refractive power; the fourth lens has positive refractive power; the fifth lens element has a negative refractive power and has at least one convex surface on an off-axis image-side surface thereof. The ultrathin lens adopts five lenses, and the optical lens has the advantages of miniaturization, higher finished quality and the like through the matching of the focal power, the surface type, the central thickness of each lens, the axial distance between each lens and the like. The method is suitable for small portable electronic mobile equipment.
Description
Technical Field
The invention relates to the technical field of imaging, in particular to an ultrathin lens.
Background
With the development trend of electronic products in a form of being thin, light, thin, short, and small, the small-sized photographing lens with good imaging quality is becoming the mainstream in the market at present.
However, it is difficult for the current downsized photographing lens to satisfy both high pixel and short overall length.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an ultra-thin lens capable of shortening the total length of the lens with a great limitation on a large image height.
The ultrathin lens has smaller volume and good imaging quality.
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides an ultrathin lens, which comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an optical filter and an image plane, wherein the diaphragm, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the optical filter and the image plane are sequentially distributed from an object side to an image side along an optical axis; the first lens has positive refractive power, and the object side surface is a convex surface; the second lens has negative refractive power, and the image side surface is a concave surface; the third lens has refractive power; the fourth lens has positive refractive power; the fifth lens element has a negative refractive power and has at least one convex surface on an off-axis image-side surface thereof.
Further, the ultra-thin lens satisfies the following conditional expression:
TTL/IH<0.6
0.3<(R3+R4)/(R3-R4)<3
wherein, TTL is the total lens length, and IH is the lens image height; r3 and R4 are radii of curvature of the object-side surface and the image-side surface of the second lens, respectively.
Further, the ultra-thin lens satisfies the following conditional expression:
HFOV>85°
the HFOV is a field angle of the lens.
Further, the ultra-thin lens satisfies the following conditional expression:
2<|F2|/F<5
wherein F2 is the second lens focal length, and F is the lens focal length.
Further, the ultra-thin lens also satisfies the following relation:
1.5<(R7+R8)/(R7-R8)<2.5
wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens element, respectively.
Further, the object side and image side surfaces of the first to fifth lenses are aspheric, wherein aspheric coefficients satisfy the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8
+A10y10+A12y12+A14y14+A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
The invention has the beneficial effects that: the ultrathin lens provided by the invention adopts five lenses, and the optical lens has the advantages of miniaturization, higher quality and the like through the matching of the focal power, the surface type, the center thickness of each lens, the axial distance between each lens and the like. The method is suitable for small portable electronic mobile equipment.
Drawings
Fig. 1 illustrates a schematic structural view of an ultra-thin lens of the present invention;
fig. 2 is a schematic structural view showing an ultrathin lens according to embodiment 1 of the present invention;
fig. 3 shows an astigmatic field curvature diagram of an ultrathin lens of embodiment 1 of the present invention;
fig. 4 is a distortion graph showing an ultra-thin lens of embodiment 1 of the present invention;
fig. 5 is a graph showing a relative illuminance curve of an ultra-thin lens according to embodiment 1 of the present invention;
fig. 6 is a schematic structural view showing an ultrathin lens according to embodiment 2 of the present invention;
fig. 7 shows an astigmatic field curvature diagram of an ultrathin lens of embodiment 2 of the present invention;
fig. 8 is a distortion curve diagram of an ultrathin lens in embodiment 2 of the present invention;
fig. 9 is a graph showing a relative illuminance curve of the ultra-thin lens according to embodiment 2 of the present invention;
fig. 10 is a schematic structural view showing an ultrathin lens according to embodiment 2 of the present invention;
fig. 11 is an astigmatic field curvature diagram of an ultrathin lens according to embodiment 3 of the present invention;
fig. 12 is a distortion curve diagram of an ultrathin lens in embodiment 3 of the present invention;
fig. 13 is a graph showing a relative illuminance curve of the ultra-thin lens according to embodiment 3 of the present invention.
In the figure: p1: a first lens; p2: a second lens; p3: a third lens; p4: a fourth lens; p5: a fifth lens; stop: a diaphragm; IR-CUT: an optical filter; IMA: and (4) an image plane.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an ultra-thin lens. The ultrathin lens sequentially comprises from an object side to an image side along an optical axis: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an optical filter and an image plane. The first lens has positive refractive power, and the object side surface is a convex surface. The second lens has negative refractive power, and the image side surface is a concave surface. The third lens has refractive power. The fourth lens has a positive refractive power. The fifth lens element has a negative refractive power and has at least one convex surface on an off-axis image-side surface thereof.
Example 1
Fig. 2 shows an optical arrangement diagram of an ultrathin lens of embodiment 1 of the present invention. As shown in fig. 2, the ultrathin lens according to the exemplary embodiment of the present invention includes, in order from an object side to an image side along an optical axis: a STOP; a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a fifth lens P5, a filter IR-CUT, and an image plane IMA.
The ultrathin lens meets the following conditional expression:
TTL/IH<0.6
wherein, TTL is the total lens length, and IH is the lens image height. The conditional expression controls the total length of the fixed image height lens to be shorter (even if the fixed image height lens is suitable for ultra-thinning), so that the fixed image height lens is used for ultra-thinned small mobile equipment such as a mobile phone.
0.3<(R3+R4)/(R3-R4)<3
Wherein R3 and R4 are radii of curvature of the object-side surface and the image-side surface of the second lens, respectively. By reasonably distributing the curvature radius of the object side and the image side of the second lens, the light deflection angle can be reduced, and the sensitivity of the lens is reduced.
HFOV>85°
The HFOV is a field angle of the lens. The ultrathin lens meeting the conditional expression has a wide-angle effect and is suitable for common front-mounted and rear-mounted lenses.
2<|F2|/F<5
Wherein F2 is the second lens focal length, and F is the lens focal length. The ultrathin lens meeting the conditional expression is beneficial to reducing aberration and improving resolving power.
1.5<(R7+R8)/(R7-R8)<2.5
Wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens element, respectively. The ultrathin lens meeting the conditional expression is beneficial to reducing aberration and improving resolving power.
The design parameters of the ultrathin lens of the embodiment refer to the following table:
watch 1 (a)
Watch 1 (b)
In this embodiment, the lens meets the requirements of the above claims, and the specific parameters thereof are shown in the following table:
watch 1 (c)
Table one (a) shows the surface type, radius of curvature, thickness, and material 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 one (b) shows surface aspherical coefficients of the respective lenses of the optical lens of example 1.
According to the table one (a) and the table one (b), the lens shape and the lens attributes of the current embodiment are clearly shown.
Referring to fig. 2, which is an optical layout diagram of the ultra-thin lens of embodiment 1, it can be seen that the close arrangement of the lenses of the lens can realize the smaller structural feature of the lens.
From the astigmatic field curves in fig. 3, it is shown more clearly that: the maximum difference value of the astigmatism S line and the T line of the lens is less than 0.1mm, and the maximum value of the field curvature is less than 0.1mm, which shows that the lens has better capability of improving the astigmatism and the field curvature.
From the distortion curve in fig. 4, it is shown more clearly that: after the lens meets the requirements of the claims, the maximum distortion value of the lens is about 2%, which shows that the lens has good capability of improving the distortion.
According to the relative illuminance curve in fig. 5, it is clearly shown that: the relative illumination of the marginal field of view of the lens is more than 25%, which indicates that the lens has better brightness ratio.
Example 2
Fig. 6 shows an optical arrangement diagram of an ultrathin lens of embodiment 2 of the present invention. As shown in fig. 6, the ultrathin lens according to the exemplary embodiment of the present invention, in order from an object side to an image side along an optical axis, comprises: a STOP; a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a fifth lens P5, a filter IR-CUT, and an image plane IMA.
The design parameters of the ultrathin lens of the embodiment refer to the following table:
watch two (a)
Watch two (b)
| Flour mark | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 1 | -5.70E-01 | -2.28E-02 | 2.56E+00 | -4.97E+01 | 5.45E+02 | -3.67E+03 | 1.53E+04 | -3.84E+04 |
| 2 | -1.94E+00 | -4.02E-01 | 9.05E-01 | -1.59E+01 | 1.74E+02 | -1.08E+03 | 4.28E+03 | -1.10E+04 |
| 3 | -1.30E+01 | -1.92E-01 | 8.61E-01 | 6.58E+00 | -7.36E+01 | 5.53E+02 | -2.53E+03 | 6.36E+03 |
| 4 | 3.72E+01 | 8.37E-03 | 2.93E+00 | -3.50E+01 | 4.48E+02 | -3.42E+03 | 1.58E+04 | -4.32E+04 |
| 5 | 1.49E+00 | -6.12E-01 | 2.50E+00 | -2.86E+01 | 2.21E+02 | -1.13E+03 | 3.75E+03 | -7.74E+03 |
| 6 | -9.18E+01 | 1.86E-01 | -2.39E+00 | 1.12E+01 | -4.08E+01 | 1.06E+02 | -1.88E+02 | 2.12E+02 |
| 7 | -2.25E+01 | -3.13E-01 | -6.56E-02 | -9.40E-01 | 1.05E+01 | -3.35E+01 | 5.41E+01 | -4.75E+01 |
| 8 | -1.31E+00 | 9.40E-02 | -9.73E-01 | 3.19E+00 | -6.75E+00 | 1.01E+01 | -9.42E+00 | 5.14E+00 |
| 9 | -8.15E+01 | -6.36E-01 | 8.64E-01 | -6.36E-01 | 3.02E-01 | -9.67E-02 | 2.08E-02 | -2.88E-03 |
| 10 | -1.35E+01 | -2.34E-01 | 2.18E-01 | -1.39E-01 | 5.47E-02 | -1.18E-02 | 7.61E-04 | 2.11E-04 |
In this embodiment, the lens meets the requirements of the above claims, and the specific parameters are shown in the following table:
watch two (c)
Table two (a) shows the surface type, radius of curvature, thickness, and material 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 two (b) shows surface aspherical coefficients of the respective lenses of the optical lens of example 2.
According to the second table (a) and the second table (b), the lens shape and the attributes of the lens of the current embodiment are clearly shown.
Referring to fig. 6, which is an optical arrangement diagram of the ultra-thin lens of embodiment 2, it can be seen that the close arrangement of the lenses of the lens can realize the smaller structural features of the lens.
According to the astigmatic field curvature curve in fig. 7, it is clearly shown that the maximum difference between the astigmatic S line and the T line of the lens is below 0.1mm, and the maximum field curvature is below about 0.1mm, indicating that the lens has better capability of improving astigmatism and field curvature.
According to the distortion curve in fig. 8, it is clearly shown that after the lens meets the requirements of the claims, the maximum distortion value of the lens is about 2%, which indicates that the lens has a good capability of improving distortion.
According to the relative illumination curve in fig. 9, it is clearly shown that the relative illumination of the peripheral field of view of the lens is greater than 25%, indicating that the lens has a better brightness ratio.
Example 3
Fig. 10 is a schematic view showing an optical arrangement of an ultrathin lens according to embodiment 3 of the present invention. As shown in fig. 10, the ultrathin lens according to the exemplary embodiment of the present invention, in order from an object side to an image side along an optical axis, comprises: a STOP; a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a fifth lens P5, a filter IR-CUT, and an image plane IMA.
The design parameters of the ultrathin lens of the embodiment refer to the following table:
watch III (a)
Watch III (b)
| Flour mark | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 1 | -5.15E-01 | -8.04E-02 | 4.34E+00 | -8.82E+01 | 1.03E+03 | -7.37E+03 | 3.25E+04 | -8.60E+04 |
| 2 | -1.92E+00 | -3.79E-01 | 1.79E+00 | -1.34E+01 | 1.01E+02 | -6.03E+02 | 2.43E+03 | -6.80E+03 |
| 3 | -1.30E+01 | -3.34E-01 | 2.77E+00 | -2.04E+01 | 1.91E+02 | -1.32E+03 | 5.72E+03 | -1.54E+04 |
| 4 | 1.49E+01 | -1.39E-01 | 7.91E-01 | -1.51E+00 | 8.34E+01 | -1.07E+03 | 6.36E+03 | -2.04E+04 |
| 5 | 1.73E+00 | -6.29E-01 | 6.26E-01 | 3.12E+00 | -4.39E+01 | 2.02E+02 | -4.64E+02 | 4.71E+02 |
| 6 | -9.17E+01 | -9.63E-02 | -8.36E-01 | 4.92E+00 | -2.59E+01 | 9.21E+01 | -2.10E+02 | 2.95E+02 |
| 7 | -2.26E+01 | -8.60E-02 | -9.33E-01 | 4.12E+00 | -9.27E+00 | 1.29E+01 | -1.19E+01 | 7.18E+00 |
| 8 | -1.94E+00 | 5.43E-02 | -8.40E-01 | 2.30E+00 | -3.73E+00 | 4.97E+00 | -4.75E+00 | 2.76E+00 |
| 9 | -4.75E+01 | -6.05E-01 | 7.64E-01 | -5.22E-01 | 2.33E-01 | -7.01E-02 | 1.41E-02 | -1.79E-03 |
| 10 | -1.39E+01 | -2.67E-01 | 2.99E-01 | -2.34E-01 | 1.17E-01 | -3.65E-02 | 6.85E-03 | -6.95E-04 |
In this embodiment, the lens meets the requirements of the above claims, and the specific parameters are shown in the following table:
watch III (c)
Table three (a) shows the surface type, radius of curvature, thickness, and material of each lens of the optical lens of example 3. Wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table three (b) shows surface aspherical coefficients of the respective lenses of the optical lens of example 3.
According to table three (a) and table three (b), the lens shape and various attributes of the lens of the current embodiment are clearly shown.
Referring to fig. 10, which is an optical arrangement diagram of the ultra-thin lens of embodiment 3, it can be seen that the close arrangement of the lenses of the lens can realize the smaller structural features of the lens.
According to the astigmatic field curvature curve in fig. 11, it is clearly shown that the maximum difference between the astigmatic S line and the T line of the lens is below 0.1mm, and the maximum value of the field curvature is below about 0.1mm, which indicates that the lens has better capability of improving astigmatism and field curvature.
According to the distortion curve in fig. 12, it is clearly shown that after the lens meets the requirements of the claims, the maximum distortion value of the lens is about 2%, which indicates that the lens has a good capability of improving distortion.
According to the relative illumination curve in fig. 13, it is clearly shown that the relative illumination of the peripheral field of view of the lens is greater than 25%, indicating that the lens has a better brightness ratio.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (6)
1. An ultrathin lens is characterized by comprising a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an optical filter and an image plane which are sequentially distributed from an object side to an image side along an optical axis;
the first lens has positive refractive power, and the object side surface is a convex surface;
the second lens has negative refractive power, and the image side surface is a concave surface;
the third lens has refractive power;
the fourth lens has positive refractive power;
the fifth lens element has a negative refractive power and has at least one convex surface on an off-axis image-side surface thereof.
2. The ultra-thin lens of claim 1, wherein the ultra-thin lens satisfies the following conditional expression:
TTL/IH<0.6
0.3<(R3+R4)/(R3-R4)<3
wherein, TTL is the total lens length, and IH is the lens image height; r3 and R4 are radii of curvature of the object-side surface and the image-side surface of the second lens, respectively.
3. The ultra-thin lens of claim 1, wherein the ultra-thin lens satisfies the following conditional expression:
HFOV>85°
the HFOV is a field angle of the lens.
4. The ultra-thin lens of claim 1, wherein the ultra-thin lens satisfies the following conditional expression:
2<|F2|/F<5
wherein F2 is the second lens focal length, and F is the lens focal length.
5. The ultra-thin lens of claim 1, further satisfying the following relationship:
1.5<(R7+R8)/(R7-R8)<2.5
wherein R7 and R8 are radii of curvature of the object-side surface and the image-side surface of the fourth lens element, respectively.
6. The ultra-thin lens system of claim 1, wherein the object-side and image-side surfaces of the first to fifth lenses are aspheric, and the aspheric coefficients satisfy the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110515178A (en) * | 2019-08-14 | 2019-11-29 | 瑞声通讯科技(常州)有限公司 | Camera optical camera lens |
| CN210294659U (en) * | 2019-09-25 | 2020-04-10 | 辽宁中蓝电子科技有限公司 | Five-piece wide-angle lens |
| CN111929840A (en) * | 2020-09-21 | 2020-11-13 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| CN111929847A (en) * | 2020-09-23 | 2020-11-13 | 辽宁中蓝光电科技有限公司 | High-pixel large-aperture lens |
| CN112799218A (en) * | 2021-02-23 | 2021-05-14 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN214504007U (en) * | 2021-05-18 | 2021-10-26 | 辽宁中蓝光电科技有限公司 | Ultrathin lens |
-
2021
- 2021-05-18 CN CN202110542048.5A patent/CN113126263A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110515178A (en) * | 2019-08-14 | 2019-11-29 | 瑞声通讯科技(常州)有限公司 | Camera optical camera lens |
| CN210294659U (en) * | 2019-09-25 | 2020-04-10 | 辽宁中蓝电子科技有限公司 | Five-piece wide-angle lens |
| CN111929840A (en) * | 2020-09-21 | 2020-11-13 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| CN111929847A (en) * | 2020-09-23 | 2020-11-13 | 辽宁中蓝光电科技有限公司 | High-pixel large-aperture lens |
| CN112799218A (en) * | 2021-02-23 | 2021-05-14 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN214504007U (en) * | 2021-05-18 | 2021-10-26 | 辽宁中蓝光电科技有限公司 | Ultrathin lens |
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