CN110333589A - A kind of optical mirror slip group - Google Patents
A kind of optical mirror slip group Download PDFInfo
- Publication number
- CN110333589A CN110333589A CN201910445148.9A CN201910445148A CN110333589A CN 110333589 A CN110333589 A CN 110333589A CN 201910445148 A CN201910445148 A CN 201910445148A CN 110333589 A CN110333589 A CN 110333589A
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- image
- lens
- lens element
- optical axis
- concave
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- 230000003287 optical effect Effects 0.000 title claims abstract description 72
- 239000011521 glass Substances 0.000 claims abstract description 9
- 238000003384 imaging method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000004075 alteration Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 201000009310 astigmatism Diseases 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 a kind of optical mirror slip group, which sequentially includes first, second, third, fourth and the 5th lens from object side to image side surface, wherein the first lens use glass material.By the concave-convex design configuration of five lens surfaces of design and aspherical setting, so that the entire length of optical mirror slip group shortens, improves image quality, enhance optical property.
Description
Technical Field
The invention belongs to the field of optical lenses, and particularly relates to an optical lens group.
Background
In addition to the basic requirements of performance resolution and high image resolution, the development trend of high-end mobile phone camera modules is to further require short overall lens length and large aperture application. Therefore, in order to balance the performance influence of the aberration caused by the lens when the lens is miniaturized and the aperture is enlarged, the number of the lenses needs to be increased to balance the performance influence, compared with the general six-piece plastic lenses, the challenge caused by the rear-section assembly quantity rate is solved, the design of adding 1 piece of glass and 4 pieces of plastic lenses is adopted in the scheme, the glass material selectivity is more various, the same benefit is achieved for reducing the number of the lenses, and the better imaging effect is achieved through the control of relevant parameters of all the lenses.
Disclosure of Invention
The invention provides a 5-piece lens group capable of achieving the same optical effect in order to solve the problem that a common six-piece plastic lens is thick as a whole, wherein a first lens is a glass lens.
Technical scheme
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 sequence along an optical axis, each lens element having 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 comprises a convex surface portion located in a region near an optical axis, and an image-side surface comprising a concave surface portion located 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 a convex object-side surface and a concave image-side surface, wherein the convex object-side surface and the concave image-side surface are respectively disposed on two sides of the object-side surface and the image-side surface, and at least one of the surfaces is aspheric;
the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface, wherein the concave object-side surface and the convex image-side surface are respectively located at two sides of the object-side surface and the image-side surface, and at least one of the surfaces is aspheric;
the fourth lens element with positive refractive power has a concave surface portion at an area near the optical axis on an image-side surface, a convex surface portion at an area near the optical axis on an image-side surface, and at least one aspheric surface;
the fifth lens element with negative refractive power has an object-side surface including a concave surface portion in a region near the optical axis, an image-side surface including a concave surface portion in a region near the optical axis, and at least one surface thereof being aspheric;
wherein,(ii) a And V1>56.5；
Wherein R1 is the radius of curvature of the first lens in the region where the object-side surface is located near the optical axis, R2 is the radius of curvature of the first lens in the region where the image-side surface is located near the optical axis, and V1 is the first lens Abbe number.
The invention further improves the following steps: the object side surface and the image side surface of the third lens are at least provided with an inflection point.
The invention further improves the following steps: the object side surface and the image side surface of the fifth lens are provided with at least one inflection point.
The invention further improves the following steps: the second to fifth lenses are made of plastic materials.
The contents written in the specification use, but are not limited to, the contents in table 1:
advantageous effects
According to the invention, the concave-convex curved surface arrangement of the five optical lenses is controlled, the relevant parameters are controlled through the relational expression, and the first lens is made of glass, so that good optical performance can be maintained, and the length of the lens can be effectively shortened.
Drawings
FIG. 1 is a schematic cross-sectional view of an optical lens assembly of embodiment 1.
FIG. 2 is a graph showing the field curvature and distortion at a wavelength of 555nm in example 1.
FIG. 3 is a detailed optical data table of each lens element of the optical lens assembly of example 1.
FIG. 4 is a table of aspheric data for the optical lens assembly of example 1.
FIG. 5 is a schematic cross-sectional view of an optical lens assembly of example 2.
FIG. 6 is a graph showing the field curvature and distortion at a wavelength of 555nm in example 2.
FIG. 7 is a detailed optical data table of the lenses of the optical lens assembly of example 2.
FIG. 8 is a table of aspheric data for the optical lens assemblies of example 2.
FIG. 9 is a cross-sectional view of the optical lens assembly of embodiment 3.
FIG. 10 is a graph showing the field curvature and distortion at a wavelength of 555nm in example 3.
FIG. 11 is a detailed optical data table of each lens of the optical lens assembly of example 3.
FIG. 12 is a table of aspheric data for the optical lens assemblies of example 3.
Detailed Description
Structure of each lens element of the lens assembly in embodiment 1 referring to fig. 1, a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, and a fifth lens element 150, wherein the first lens element is a glass lens element, and the second to fourth lens elements are made of plastic material 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 portion 1111 located in a region near the optical axis, and the image-side surface 112 includes a concave portion 1121 located in a region near the optical axis.
The second lens element 120 with negative refractive power. The object-side surface 121 includes a convex portion 1211 located in a vicinity of the optical axis, and the image-side surface 122 includes a concave portion 1221 located in a vicinity of the optical axis.
The third lens element 130 with positive refractive power. The object-side surface 131 includes a convex surface 1311 located in a region near the optical axis, the image-side surface 132 includes a convex surface 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 in a region near the optical axis.
The fifth lens element 150 has negative refractive power. The object-side surface 151 includes a concave portion 1511 located in a region near the optical axis, the image-side surface 152 includes a concave portion 1521 located in a region near the optical axis, and the image-side surface 152 has an inflection point B.
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 equations:
。
wherein:
r represents a radius of curvature of the lens surface;
z represents the depth of the aspheric surface (the perpendicular distance between a point on the aspheric surface at a distance Y from the optical axis and a tangent plane tangent to the vertex on the aspheric optical axis);
y represents a vertical distance between a point on the aspherical surface and the optical axis;
k is a conic constant (conic constant);
ai is the ith order aspheric coefficient.
In fig. 2, a field curvature diagram of 555nm wavelength in the present embodiment is plotted on the left side, 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 it can be seen that the variation of the horizontal field curvature position is ± 0.04 mm; the distortion diagrams of five different wavelengths 555nm are drawn on the right side of fig. 3, and it can be seen from fig. 2 that the distortion phase difference in the embodiment 1 is maintained within 2.0%, and the good imaging effect is achieved.
Example 1 optical parameters are shown in fig. 3, and aspheric coefficients in the object-side and image-side surfaces are shown in fig. 4; to obtain: the length of the length (TTL) on the optical axis from the first lens object-side surface 111 to the image plane 170 is 4.553mm, the effective Focal Length (FL) is 3.87mm, the half maximum field angle (HFOV) is 38.9 degrees, and the aperture value (Fno) is 2.0, where the value of R2/R1 is 2.95 and the value of V1 is 57.9.
Example 2 the structure of example 2 is shown in fig. 5, and similar components are labeled with similar reference numerals as in example 1, and only the beginning of the label is changed to 2, wherein the convex and concave portions and the inflection points of the object-side and image-side surfaces are the same as those in example 1, such as the object-side surface 211 of the first lens 210, the image-side surface 212 of the first lens 210, and so on. Example 2 differs from example 1 in the parameters such as the radius of curvature, lens thickness, lens gap, lens refractive index, dispersion coefficient, and aspherical surface coefficient.
FIG. 6 is a schematic diagram of the curvature of field with a wavelength of 555nm in the present embodiment, in which 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 it can be seen that the variation of the horizontal curvature of field position is + -0.04 mm; the distortion diagram of 555nm wavelength is drawn on the right side of fig. 6, and it can be seen that the distortion phase difference in embodiment 2 is maintained within 2.0%, and a good imaging effect is achieved.
Example 2 optical parameters are shown in fig. 7, and aspheric coefficients in the object-side and image-side surfaces are shown in fig. 8; to obtain: the length of the first lens object-side surface 211 to the image plane 170 on the optical axis (TTL) is 4.555mm, the effective Focal Length (FL) is 3.87mm, the half maximum field angle (HFOV) is 38.9 degrees, and the aperture value (Fno) is 2.0, where the value of R2/R1 is 3.1 and the value of V1 is 59.4.
Example 3 the structure of embodiment 3 is as shown in fig. 9, and the present embodiment uses the same reference numerals as in example 1 to indicate similar components, and is only changed to 3 at the beginning of the label, wherein the convex and concave portions and the reverse curvature of each object-side and image-side surface are the same as those in example 1, such as the object-side surface 311 of the first lens 310, the image-side surface 312 of the first lens 310, and so on. Example 3 differs from example 1 in the parameters such as the radius of curvature, lens thickness, lens gap, lens refractive index, dispersion coefficient, and aspherical surface coefficient.
FIG. 10 is a diagram of the curvature of field at a wavelength of 555nm in the present embodiment, in which 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 it can be seen that the variation of the horizontal curvature of field position is + -0.04 mm; the distortion diagram of 555nm wavelength is drawn on the right side of fig. 10, and it can be seen that the distortion phase difference in embodiment 2 is maintained within 2.0%, and a good imaging effect is achieved.
Example 3 optical parameters are shown in fig. 11, and aspheric coefficients in the object-side and image-side surfaces are shown in fig. 12; to obtain: the length of the first lens object-side surface 311 to the image plane 170 on the optical axis (TTL) is 4.556mm, the effective Focal Length (FL) is 3.87mm, and the half maximum field angle (HFOV) is 39.4 degrees, where R2/R1 has a value of 3.4, the aperture value (Fno) is 2.0, and the V1 value is 64.1.
The optical lens group is provided with 5 lenses, the first lens has positive refractive power, the area of the object side surface, which is positioned near the optical axis, is provided with a convex surface part, and the area of the image side surface, which is positioned near the optical axis, is provided with a concave surface part, so that light rays can be gathered; the second lens element with negative refractive power has a convex surface portion on the object-side surface and a concave surface portion on the image-side surface, which are respectively located at the areas near the optical axis, and is favorable for correcting aberration generated by the first lens element; the third lens element with positive refractive power has a convex surface portion near the optical axis on the object-side surface and a convex surface portion near the optical axis on the image-side surface, so that the aberration generated by the second lens element can be corrected; the fourth lens element with positive refractive power has a concave portion on the object-side surface and a convex portion on the image-side surface, and the concave portion and the convex portion are located on the object-side surface and the convex portion, respectively, so as to correct aberration generated by the second lens element; the fifth lens element with positive refractive power has a concave portion located in a region near the optical axis on the object-side surface and a concave portion located in a region near the optical axis on the image-side surface, thereby facilitating correction of phase difference generated by the fourth lens element.
The first lens is made of glass material and has a larger dispersion coefficient, so that better imaging quality can be obtained.
At least one of the object side surface and the image side surface of the first lens element to the fifth lens element is selected to be an aspheric surface, so that astigmatism and distortion of the whole optical lens assembly can be corrected, and imaging quality is enhanced.
The object side surface and the image side surface of the third lens and the fifth lens are respectively provided with at least one inflection point, which is favorable for correcting the aberration of the area near the circumference of the lens group.
When it is satisfied withAnd when the condition is adopted, the total length of the whole lens group is favorably reduced, and the imaging quality of the lens group is ensured.
When the condition V1>56.5 is satisfied, the overall length of the whole lens set is reduced.
Claims (4)
1. An optical lens assembly comprising, sequentially arranged along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, wherein the first lens element to the fifth lens element have refractive power, and 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 comprises a convex surface portion located in a region near an optical axis, and an image-side surface comprising a concave surface portion located 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 a convex object-side surface and a concave image-side surface, wherein the convex object-side surface and the concave image-side surface are respectively disposed on two sides of the object-side surface and the image-side surface, and at least one of the surfaces is aspheric;
the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface, wherein the concave object-side surface and the convex image-side surface are respectively located at two sides of the object-side surface and the image-side surface, and at least one of the surfaces is aspheric;
the fourth lens element with positive refractive power has a concave surface portion at an area near the optical axis on an image-side surface, a convex surface portion at an area near the optical axis on an image-side surface, and at least one aspheric surface;
the fifth lens element with negative refractive power has an object-side surface including a concave surface portion in a region near the optical axis, an image-side surface including a concave surface portion in a region near the optical axis, and at least one surface thereof being aspheric;
wherein,(ii) a And V1>56.5；
Wherein R1 is the radius of curvature of the first lens in the region where the object-side surface is located near the optical axis, R2 is the radius of curvature of the first lens in the region where the image-side surface is located near the optical axis, and V1 is the first lens Abbe number.
2. The set of claim 1, wherein the object-side surface and the image-side surface of the third lens element have at least one inflection point.
3. The optical lens assembly of claim 1 or 2, wherein the fifth lens element has at least one inflection point on the object-side surface and the image-side surface.
4. The optical lens assembly of claim 1, wherein the second to fifth lenses are made of plastic.
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 |
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| CN110333589A true CN110333589A (en) | 2019-10-15 |
| CN110333589B CN110333589B (en) | 2024-04-16 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120300316A1 (en) * | 2011-05-26 | 2012-11-29 | Largan Precision Co. | Optical Imaging Lens Assembly |
| 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 |
| US20130335833A1 (en) * | 2012-06-14 | 2013-12-19 | Largan Precision Co., Ltd. | Optical image lens system |
| 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 |
-
2019
- 2019-05-27 CN CN201910445148.9A patent/CN110333589B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120300316A1 (en) * | 2011-05-26 | 2012-11-29 | Largan Precision Co. | Optical Imaging Lens Assembly |
| 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 |
| US20130335833A1 (en) * | 2012-06-14 | 2013-12-19 | Largan Precision Co., Ltd. | Optical image lens system |
| 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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