CN110333589B - Optical lens group - Google Patents
Optical lens group Download PDFInfo
- Publication number
- CN110333589B CN110333589B CN201910445148.9A CN201910445148A CN110333589B CN 110333589 B CN110333589 B CN 110333589B CN 201910445148 A CN201910445148 A CN 201910445148A CN 110333589 B CN110333589 B CN 110333589B
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- lens
- lens element
- image
- optical axis
- refractive power
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- 230000003287 optical effect Effects 0.000 title claims abstract description 76
- 238000003384 imaging method Methods 0.000 claims abstract description 12
- 239000011521 glass Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000004075 alteration Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses an optical lens group, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side surface to an image side surface, wherein the first lens is made of glass materials. By designing the concave-convex design configuration and the aspheric surface arrangement of the surfaces of the five lenses, the overall length of the optical lens group is shortened, the imaging quality is improved, and the optical performance is enhanced.
Description
Technical Field
The invention belongs to the field of optical lenses, and particularly relates to an optical lens group.
Background
The development of high-end mobile phone camera modules has so far required short overall lens length and large aperture applications in addition to basic requirements for performance resolution and high image quality resolution. Therefore, in order to balance the miniaturization and large aperture of the lens, the number of lenses needs to be increased to balance the influence of aberration caused by the lens on performance, compared with the general six-lens plastic lens, the design of 1-lens and 4-lens plastic lens is adopted, the selectivity of glass materials is more various, the same benefits are achieved by reducing the number of lenses and further achieving the same performance effect, and better imaging effect is achieved through the control of related parameters of each lens.
Disclosure of Invention
In order to solve the problem that the whole of a general six-piece plastic lens is thicker, the invention provides a 5-piece lens group capable of achieving the same optical effect, wherein the first lens is a glass lens.
Technical proposal
An optical lens assembly comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in order along an optical axis, each lens element having an object-side surface facing an object side and passing light and an image-side surface facing an image side and passing imaging light,
the first lens element with positive refractive power has a convex surface portion in a region near an optical axis, and the image-side surface has a concave surface portion in a region near the optical axis, wherein at least one surface of the first lens element is aspheric;
the first lens is made of glass;
the second lens element with negative refractive power has an object-side surface comprising a convex portion in a region near the optical axis, and an image-side surface comprising a concave portion in a region near the optical axis, wherein at least one of the surfaces is aspheric;
the third lens element with positive refractive power has an object-side surface comprising a convex portion in an area near an optical axis, and an image-side surface comprising a convex portion in an area near the optical axis, wherein at least one of the surfaces is aspheric;
the fourth lens element with positive refractive power has an image-side surface comprising a concave portion in a region near the optical axis, and an image-side surface comprising a convex portion in a region near the optical axis, wherein at least one of the surfaces is aspheric;
the fifth lens element with negative refractive power has an object-side surface comprising a concave portion in an area near an optical axis, and an image-side surface comprising a concave portion in an area near the optical axis, wherein at least one of the surfaces is aspheric;
wherein,the method comprises the steps of carrying out a first treatment on the surface of the V1>56.5；
Wherein R1 is the radius of curvature of the object-side surface of the first lens in the vicinity of the optical axis, R2 is the image-side surface of the first lens in the light
The radius of curvature of the near-axis region, V1, is the first lens abbe number.
The invention is further improved as follows: the third lens object side surface and the image side surface are provided with at least one inflection point.
The invention is further improved as follows: the fifth lens element has at least one inflection point on an object-side surface and an image-side surface.
The invention is further improved as follows: the second to fifth lenses are made of plastic materials.
The content written in the specification uses, but is not limited to, the content in table 1:
advantageous effects
According to the invention, by controlling the concave-convex curved surface arrangement of the five optical lenses and controlling related parameters by a relational expression, and the first lens is made of glass, good optical performance can be maintained, and the lens length can be effectively shortened.
Drawings
Fig. 1 is a schematic cross-sectional view of an optical lens assembly according to example 1.
FIG. 2 is a graph showing the curvature of field and distortion at a wavelength of 555nm in example 1.
Fig. 3 is a detailed optical data table diagram of each lens of the optical lens group in example 1.
Fig. 4 is a table diagram of aspherical data in the optical lens group of example 1.
Fig. 5 is a schematic cross-sectional view of an optical lens assembly in embodiment 2.
FIG. 6 is a graph showing the curvature of field and distortion at a wavelength of 555nm in example 2.
Fig. 7 is a detailed optical data table diagram of each lens of the optical lens group in example 2.
Fig. 8 is a table diagram of aspherical data in the optical lens group of example 2.
Fig. 9 is a schematic cross-sectional view of an optical lens assembly in embodiment 3.
FIG. 10 is a graph showing the curvature of field and distortion at a wavelength of 555nm in example 3.
Fig. 11 is a detailed optical data table diagram of each lens of the optical lens group of example 3.
Fig. 12 is a table diagram of aspherical data in the optical lens group of example 3.
Detailed Description
Embodiment 1 lens assembly structure each lens assembly structure is shown in fig. 1, wherein the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, and the fifth lens element 150 are glass lenses, and the second to fourth lens elements are plastic or other transparent materials; the planar lens 170 is a filter.
In the present embodiment, the first lens element 110 has positive refractive power. The object side surface 111 includes a convex surface 1111 located near the optical axis, and the image side surface 112 includes a concave surface 1121 located near the optical axis.
The second lens element 120 has negative refractive power. Object side 121 includes a convex portion 1211 located in the vicinity of the optical axis, and image side 122 includes a concave portion 1221 located in the vicinity of the optical axis.
The third lens element 130 has positive refractive power. The object-side surface 131 includes a convex portion 1311 located in a region near the optical axis, and the image-side surface 132 includes a convex portion 1321 located near the optical axis, and the object-side surface 132 has an inflection point a.
The fourth lens element 140 has positive refractive power. The object side surface 141 includes a concave portion 1411 located near the optical axis, and the image side surface 142 includes a convex portion 1421 located near the optical axis.
The fifth lens element 150 with negative refractive power. The object-side surface 151 includes a concave portion 1511 located in a vicinity of the optical axis, the image-side surface 152 includes a concave portion 1521 located in a vicinity of the optical axis, and the image-side surface 152 has an inflection point B.
The total of ten aspheric surfaces of the object-side surface 111 and the image-side surface 112 of the first lens element 110, the object-side surface 121 and the image-side surface 122 of the second lens element 120, the object-side surface 131 and the image-side surface 132 of the third lens element, the object-side surface 141 and the image-side surface 142 of the fourth lens element, and the object-side surface 151 and the image-side surface 152 of the fifth lens element 150 are defined by the following aspheric curve formula:
wherein:
r represents the radius of curvature of the lens surface;
z represents the depth of the aspheric surface (the point on the aspheric surface that is Y from the optical axis and is perpendicular to the tangential plane that is tangential to the vertex on the optical axis of the aspheric surface);
y represents the vertical distance between the point on the aspheric curved surface and the optical axis;
k is a conic constant;
ai is the i-th order aspheric coefficient.
The left side of fig. 2 is a graph showing a field curvature at a wavelength of 555nm in the present embodiment, wherein the horizontal axis is defined as the field curvature position of each wavelength, the vertical axis is defined as the image height, and the variation of the horizontal field curvature position is + -0.04 mm; the distortion at 555nm is plotted on the right side of fig. 3, and it can be seen from fig. 2 that the distortion phase difference in example 1 is maintained within 2.0%, so that good imaging effect is achieved.
Example 1 optical parameters are shown in fig. 3, and aspherical coefficients in the object side and image side are shown in fig. 4; the following steps are obtained: the length of the first lens object-side surface 111 to the imaging surface 170 on the optical axis (TTL) is 4.553 mm, the effective Focal Length (FL) is 3.87mm, the half maximum field angle (HFOV) is 38.9 degrees, the aperture value (Fno) is 2.0, wherein the value of R2/R1 is 2.95 and the V1 value is 57.9.
Embodiment 2 is shown in fig. 5, in which like reference numerals denote like elements with respect to embodiment 1, and only the reference numerals are changed to 2 at the beginning, wherein the convex and concave portions of the object-side and image-side surfaces and the inflection points are the same as those in embodiment 1, such as the object-side surface 211 of the first lens element 210, the image-side surface 212 of the first lens element 210, and so on. Example 2 differs from example 1 in the parameters such as radius of curvature, lens thickness, lens gap, lens refractive index, dispersion coefficient, aspherical coefficient, and the like.
The left side of FIG. 6 is a graph showing the field curvature at 555nm in this embodiment, wherein the horizontal axis is defined as the field curvature position of each wavelength, and the vertical axis is defined as the image height, and the variation of the horizontal field curvature position is + -0.04 mm; the right side of fig. 6 is a schematic diagram of the distortion at 555nm, and it can be seen that the distortion phase difference in example 2 is maintained within 2.0%, so as to achieve a good imaging effect.
Example 2 optical parameters are shown in fig. 7, and aspherical coefficients in the object side and image side are shown in fig. 8; the following steps are obtained: the length of the first lens object-side surface 211 to the imaging surface 170 on the optical axis (TTL) is 4.555 mm, the effective Focal Length (FL) is 3.87mm, the half maximum field angle (HFOV) is 38.9 degrees, the aperture value (Fno) is 2.0, wherein the value of R2/R1 is 3.1 and the V1 value is 59.4.
Embodiment 3 is shown in fig. 9, in which like reference numerals denote like elements throughout the embodiments 1, and only the reference numerals are changed to 3, wherein the convex and concave portions of the object-side and image-side surfaces and the inflection points are the same as those of embodiment 1, such as the object-side surface 311 of the first lens element 310, the image-side surface 312 of the first lens element 310, and so on. Example 3 differs from example 1 in the parameters such as radius of curvature, lens thickness, lens gap, lens refractive index, dispersion coefficient, aspherical coefficient, and the like.
The left side of fig. 10 is a graph showing the curvature of field at 555nm in the present embodiment, wherein the horizontal axis is defined as the curvature of field position of each wavelength, and the vertical axis is defined as the image height, and the variation of the curvature of field position in the horizontal direction is ±0.04mm; the right side of fig. 10 is a schematic diagram of the distortion at 555nm, and it can be seen that the distortion phase difference in example 2 is maintained within 2.0%, so as to achieve a good imaging effect.
Example 3 optical parameters are shown in fig. 11, and aspherical coefficients in the object side and image side are shown in fig. 12; the following results: the length of the first lens object-side surface 311 to the imaging surface 170 on the optical axis (TTL) is 4.556 mm, the effective Focal Length (FL) is 3.87mm, the half maximum field angle (HFOV) is 39.4 degrees, the value of R2/R1 is 3.4, the aperture value (Fno) is 2.0, and the V1 value is 64.1.
The optical lens assembly has 5 lens elements with positive refractive power, wherein the image-side surface of the object-side surface has a convex surface portion in a region near the optical axis, and the image-side surface has a concave surface portion near the optical axis, which is beneficial to gathering light rays; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface, respectively, for correcting aberration generated by the first lens element; the third lens element with positive refractive power has a convex surface portion near an optical axis on an object-side surface and a convex surface portion near the optical axis on an image-side surface, which are beneficial to correcting phase differences generated by the second lens element; the fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface, respectively, for correcting aberration generated by the second lens element; the fifth lens element with positive refractive power has an object-side surface with a concave portion in a region near the optical axis, and the image-side surface comprises a concave portion in a region near the optical axis, which is beneficial to correcting the phase difference generated by the fourth lens element.
The first lens is made of glass material, has larger dispersion coefficient and can obtain better imaging quality.
At least one of the object side surface and the image side surface of the first lens to the fifth lens is an aspheric surface, so that the integral astigmatism and distortion of the optical lens group can be corrected, and the imaging quality can be enhanced.
The object side surface and the image side surface of the third lens element and the fifth lens element respectively have at least one inflection point, which is beneficial to correcting the aberration of the peripheral area of the lens assembly.
When meeting the requirementsThe overall length of the lens group can be reduced and the image of the lens group can be ensured under the condition
Quality.
When the V1>56.5 conditional expression is satisfied, the overall length of the overall lens group is reduced.
Claims (1)
1. An optical lens assembly comprising five lens elements, wherein a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element are arranged in order along an optical axis, each of the first to fifth lens elements has refractive power, each lens element has an object-side surface facing an object side and allowing light to pass therethrough and an image-side surface facing an image side and allowing imaging light to pass therethrough,
the first lens element with positive refractive power has a convex surface portion in a region near an optical axis, and the image-side surface has a concave surface portion in a region near the optical axis, wherein at least one surface of the first lens element is aspheric;
the first lens is made of glass;
the second lens element with negative refractive power has an object-side surface comprising a convex portion in a region near the optical axis, and an image-side surface comprising a concave portion in a region near the optical axis, wherein at least one of the surfaces is aspheric;
the third lens element with positive refractive power has an object-side surface comprising a convex portion in an area near an optical axis, and an image-side surface comprising a convex portion in an area near the optical axis, wherein at least one of the surfaces is aspheric;
the fourth lens element with positive refractive power has an image-side surface comprising a concave portion in a region near the optical axis, and an image-side surface comprising a convex portion in a region near the optical axis, wherein at least one of the surfaces is aspheric;
the fifth lens element with negative refractive power has an object-side surface comprising a concave portion in an area near an optical axis, and an image-side surface comprising a concave portion in an area near the optical axis, wherein at least one of the surfaces is aspheric;
wherein,the method comprises the steps of carrying out a first treatment on the surface of the V1>56.5；
Wherein R1 is the radius of curvature of the object-side surface of the first lens element in the vicinity of the optical axis, R2 is the radius of curvature of the image-side surface of the first lens element in the vicinity of the optical axis, V1 is the first lens Abbe number,
the third lens element has at least one inflection point on the object-side surface and the image-side surface,
the fifth lens element has at least one inflection point on the object-side surface and the image-side surface,
the second to fifth lenses are made of plastic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910445148.9A CN110333589B (en) | 2019-05-27 | 2019-05-27 | Optical lens group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910445148.9A CN110333589B (en) | 2019-05-27 | 2019-05-27 | Optical lens group |
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| Publication Number | Publication Date |
|---|---|
| CN110333589A CN110333589A (en) | 2019-10-15 |
| CN110333589B true CN110333589B (en) | 2024-04-16 |
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| CN201910445148.9A Active CN110333589B (en) | 2019-05-27 | 2019-05-27 | Optical lens group |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033907A (en) * | 2011-09-28 | 2013-04-10 | 大立光电股份有限公司 | Optical imaging lens system |
| TW201317617A (en) * | 2012-03-30 | 2013-05-01 | 玉晶光電股份有限公司 | Mobile device and optical imaging lens thereof |
| CN103293637A (en) * | 2013-02-06 | 2013-09-11 | 玉晶光电(厦门)有限公司 | Five-patch type optical imaging lens and electronic device using same |
| TW201508323A (en) * | 2014-08-27 | 2015-03-01 | 玉晶光電股份有限公司 | Imaging lens and electronic apparatus utilizing the imaging lens |
| TWI524109B (en) * | 2015-02-05 | 2016-03-01 | 光燿科技股份有限公司 | Optical imaging lens |
| CN106970457A (en) * | 2017-01-24 | 2017-07-21 | 玉晶光电(厦门)有限公司 | Optical mirror slip group |
| CN210051954U (en) * | 2019-05-27 | 2020-02-11 | 江苏光腾光学有限公司 | Optical lens group |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI453498B (en) * | 2011-05-26 | 2014-09-21 | Largan Precision Co | Optical imaging lens assembly |
| TWI474072B (en) * | 2012-06-14 | 2015-02-21 | Largan Precision Co Ltd | Optical image lens system |
-
2019
- 2019-05-27 CN CN201910445148.9A patent/CN110333589B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033907A (en) * | 2011-09-28 | 2013-04-10 | 大立光电股份有限公司 | Optical imaging lens system |
| TW201317617A (en) * | 2012-03-30 | 2013-05-01 | 玉晶光電股份有限公司 | Mobile device and optical imaging lens thereof |
| CN103293637A (en) * | 2013-02-06 | 2013-09-11 | 玉晶光电(厦门)有限公司 | Five-patch type optical imaging lens and electronic device using same |
| TW201508323A (en) * | 2014-08-27 | 2015-03-01 | 玉晶光電股份有限公司 | Imaging lens and electronic apparatus utilizing the imaging lens |
| TWI524109B (en) * | 2015-02-05 | 2016-03-01 | 光燿科技股份有限公司 | Optical imaging lens |
| CN106970457A (en) * | 2017-01-24 | 2017-07-21 | 玉晶光电(厦门)有限公司 | Optical mirror slip group |
| CN210051954U (en) * | 2019-05-27 | 2020-02-11 | 江苏光腾光学有限公司 | Optical lens group |
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| Publication number | Publication date |
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| CN110333589A (en) | 2019-10-15 |
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