CN210038211U - Optical lens group - Google Patents
Optical lens group Download PDFInfo
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- CN210038211U CN210038211U CN201920731969.4U CN201920731969U CN210038211U CN 210038211 U CN210038211 U CN 210038211U CN 201920731969 U CN201920731969 U CN 201920731969U CN 210038211 U CN210038211 U CN 210038211U
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Abstract
The utility model discloses an optics lens group, this optics lens group includes first, second, third, fourth, fifth and sixth lens according to the preface from the object side to the image side. Through the concave-convex design configuration and the aspheric surface arrangement of the surfaces of the six lenses, the whole length of the optical lens group is shortened, the imaging quality is improved, and the optical performance is enhanced.
Description
Technical Field
The utility model belongs to the optical lens piece field, a special design optical lens piece group.
Background
With the development of mobile phones and other electronic devices, light and thin devices are increasingly favored by the field of view, and the size of an optical lens group serving as the device affects the thickness of the whole size of the device; at present, a lens is generally designed in a 5-piece mode, and the aperture value is generally 2.0; the aperture value is inversely proportional to the size of the aperture, and the larger the aperture is, the better the imaging quality is; therefore, to make a mobile phone light and thin and to increase the aperture, the problem of the size of the lens must be solved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the whole problem thick, that the light and thin type, big light ring optics lens group that 5 formula lens groups are little, provided a 6 formula lens group and constitute.
Technical scheme
An optical lens assembly includes, sequentially arranged along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, wherein the first to sixth lens elements have 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 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 second lens element with negative refractive power has a concave surface portion on the object-side surface and a concave surface portion on the image-side surface, wherein at least one surface of the second lens element is aspheric;
the third lens element with refractive power has an object-side surface including a concave surface portion located in a region near an optical axis, and at least one surface of the concave surface portion is aspheric;
the fourth lens element with refractive power has an image-side surface including a convex surface portion located in a region near the optical axis, wherein at least one surface of the convex surface portion is aspheric;
the fifth lens element with positive refractive power has a concave surface portion located in a region near an optical axis on an object-side surface and a convex surface portion located in a region near the optical axis on an image-side surface, and at least one surface of the fifth lens element is aspheric;
the sixth lens element with negative refractive power has an object-side surface having a concave surface portion located in a region near the optical axis, an image-side surface having a concave surface portion located in a region near the optical axis, and at least one of the object-side surface and the image-side surface having an inflection point, wherein at least one of the object-side surface and the image-side surface is aspheric;
therein, 1.0<
<2.25 and Fno more than or equal to 1.75 is less than or equal to 2.2;
where T3 represents the center thickness of the third lens on the optical axis, T4 represents the center thickness of the fourth lens on the optical axis, T34 represents the air gap between the third lens and the fourth lens on the optical axis, and Fno represents the aperture value.
An optical lens assembly, comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element sequentially arranged along an optical axis, each lens element having an object-side surface facing an object side and passing light therethrough and an image-side surface facing an image side and passing imaging light 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 second lens element with negative refractive power has a concave surface portion on the object-side surface and a concave surface portion on the image-side surface, wherein at least one surface of the second lens element is aspheric;
the third lens element with refractive power has an object-side surface including a concave surface portion located in a region near an optical axis, and at least one surface of the concave surface portion is aspheric;
the fourth lens element with refractive power has an image-side surface including a convex surface portion located in a region near the optical axis, wherein at least one surface of the convex surface portion is aspheric;
the fifth lens element with positive refractive power has a concave surface portion located in a region near an optical axis on an object-side surface and a convex surface portion located in a region near the optical axis on an image-side surface, and at least one surface of the fifth lens element is aspheric;
the sixth lens element with negative refractive power has an object-side surface having a concave surface portion located in a region near the optical axis, an image-side surface having a concave surface portion located in a region near the optical axis, and at least one of the object-side surface and the image-side surface having an inflection point, wherein at least one of the object-side surface and the image-side surface is aspheric;
therein, 1.0<
<2.25 and 0 ≤
<36；
Where T3 represents the center thickness of the third lens on the optical axis, T4 represents the center thickness of the fourth lens on the optical axis, T34 represents the air gap between the third lens and the fourth lens on the optical axis, the second lens Abbe number V2, and the fourth lens Abbe number V4.
The utility model discloses the further improvement is: the refractive powers of the third lens element and the fourth lens element are opposite.
The utility model discloses further improve and be: the first to sixth lenses are made of plastic materials.
Advantageous effects
The utility model discloses a concave-convex curved surface of six optical lens of control arranges to in order to control relevant parameter through the relational expression, can maintain good optical property, and effectively shorten camera lens length, increase camera lens light ring.
The contents written in the specification use, but are not limited to, the contents in table 1:
drawings
FIG. 1 is a schematic cross-sectional view I of the optical lens assembly of embodiment 1.
FIG. 2 is a schematic cross-sectional view II of the optical lens assembly of embodiment 1.
FIG. 3 is a graph showing astigmatism and distortion of light beams of different wavelengths in example 1.
FIG. 4 is a detailed optical data table of the lenses of the optical lens assembly of example 1.
FIG. 5 is a table of aspheric data for the optical lens assemblies of example 1.
FIG. 6 is a schematic cross-sectional view of an optical lens assembly of example 2.
FIG. 7 is a graph showing the astigmatism and distortion of light rays of different wavelengths in example 2.
FIG. 8 is a detailed optical data table of the lenses of the optical lens assembly of example 2.
FIG. 9 is a table of aspheric data for the optical lens assemblies of example 2.
FIG. 10 is a cross-sectional view of the optical lens assembly of embodiment 3.
FIG. 11 is a graph showing astigmatism and distortion of light beams with different wavelengths in example 3.
FIG. 12 is a detailed optical data table of each lens of the optical lens assembly of example 3.
FIG. 13 is a table of aspheric data for the optical lens assemblies of example 3.
FIG. 14 is a cross-sectional view of the optical lens assembly of embodiment 4.
FIG. 15 is a graph showing astigmatism and distortion of light beams of different wavelengths in example 4.
FIG. 16 is a detailed optical data table of the lenses of the optical lens assembly of example 4.
FIG. 17 is a table of aspheric data for the optical lens assembly of example 4.
Detailed Description
Structure of each lens element of the lens assembly in embodiment 1 referring to fig. 1 and 2, the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150, and the sixth lens element 160 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. At least one of the object-side surface 111 and the image-side surface 112 is aspheric.
The second lens element 120 with negative refractive power. The object-side surface 121 includes a concave portion 1211 located in a region near the optical axis, and the image-side surface 122 includes a concave portion 1221 located in a region near the optical axis. At least one of the object-side surface 121 and the image-side surface 122 is aspheric.
The third lens element 130 with refractive power. The object side surface 131 includes a concave surface 1311 located in a region near the optical axis. At least one of the object-side surface 131 and the image-side surface 132 is aspheric.
The fourth lens element 140 has refractive power. The image side surface 142 includes a convex portion 1421 located in a region near the optical axis. At least one of the image-side surface 141 and the object-side surface 142 is aspheric.
The fifth lens element 150 has positive 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 convex surface portion 1521 located in a region near the optical axis. At least one of the object-side surface 151 and the image-side surface 152 is aspheric.
The sixth lens element 160 with negative refractive power. The object side surface 161 includes a concave portion 1611 located in a region near the optical axis. The image side surface 162 includes a concave portion 1621 located in a region near the optical axis. At least one of the object-side surface 161 and the image-side surface 162 is aspheric, and the image-side surface 162 has an inflection point a.
Twelve 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, the object-side surface 151 and the image-side surface 152 of the fifth lens element 150, and the object-side surface 161 and the image-side surface 162 of the sixth lens element are defined according to 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. 3, astigmatism diagrams of five different wavelengths (470 nm, 510nm, 555nm, 610nm and 650 nm) in the present embodiment are plotted on the left side, wherein the horizontal axis is defined as the astigmatism position of each wavelength, and the vertical axis is defined as the image height, and it can be seen that the variation of the transverse astigmatism position is ± 0.04 mm; the distortion of five different wavelengths (470 nm, 510nm, 555nm, 610nm and 650 nm) 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%, and the good imaging effect is obtained.
Example 1 optical parameters are shown in fig. 4, and aspheric coefficients in the object-side and image-side surfaces are shown in fig. 5; to obtain: the length of the first lens object-side surface 111 to the imaging surface 180 on the optical axis (TTL) is 4.402mm, the effective Focal Length (FL) is 3.61mm, and the half maximum field angle (HFOV) is 38.4 degrees, where
Has a value of 1.53, an aperture value (Fno) of 1.8,
the value of (A) was 35.5.
Example 2 the structure of embodiment 2 is as shown in fig. 6, and the present embodiment uses the same reference numerals as those used in example 1 to indicate similar components, which is only changed to 2 at the beginning of the label, wherein the convex and concave portions and the reverse curvature of each object-side surface and image-side surface are the same as those in example 1 (not specifically shown in fig. 6), 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. 7 is a graph of astigmatism at five different wavelengths (470 nm, 510nm, 555nm, 610nm, and 650 nm) in the present embodiment, where the horizontal axis is defined as the astigmatism position at each wavelength and the vertical axis is defined as the image height, and it can be seen that the variation of the transverse astigmatism position is + -0.04 mm; the distortion diagrams of five different wavelengths (470 nm, 510nm, 555nm, 610nm and 650 nm) are plotted on the right side of fig. 7, and it can be seen that the distortion phase difference is maintained within 2.0% in example 2, and a good imaging effect is achieved.
In embodiment 2, the optical parameters are shown in fig. 8, and the aspheric coefficients in the object-side surface and the image-side surface are shown in fig. 9; to obtain: the length from the object-side surface 211 of the first lens to the image plane 280 on the optical axis (TTL) is 4.454mm, the effective focal length (FL) 3.61mm and a half maximum field angle (HFOV) of 38.4 degrees, wherein
Has a value of 1.22, an aperture value (Fno) of 1.8,
the value of (d) is 0.
FIG. 11 shows schematic diagrams of astigmatism at five different wavelengths (470 nm, 510nm, 555nm, 610nm and 650 nm) in the present embodiment, and it can be seen that the variation of the transverse astigmatism position is + -0.04 mm; the distortion diagrams of different wavelengths (470 nm, 510nm, 555nm, 610nm and 650 nm) are plotted on the right side of fig. 11, and it can be seen that the distortion phase difference is maintained within 2.0% in example 3, and a good imaging effect is achieved.
In embodiment 3, the optical parameters are shown in fig. 12, and the aspheric coefficients in the object-side surface and the image-side surface are shown in fig. 13; to obtain: the length on the optical axis (TTL) from the first lens object-side surface 311 to the imaging surface 380 is 4.453mm, the effective Focal Length (FL) is 3.61mm, and the half-maximum field angle (HFOV) is 38.4 degrees, whereHas a value of 1.28, an aperture value (Fno) of 1.9,the value of (d) is 0.
Embodiment 4 as shown in fig. 14, similar components are denoted by similar reference numerals as in embodiment 1, and only the beginning of the label is changed to 4, wherein the convex and concave portions and the inflection points of each of the object-side and image-side surfaces are the same as those in embodiment 1 (not specifically shown in fig. 14), such as the object-side surface 411 of the first lens 410, the image-side surface 412 of the first lens 410, and so on. Example 4 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. 15 is a graph of astigmatism at five different wavelengths (470 nm, 510nm, 555nm, 610nm, and 650 nm) in the present embodiment, and it can be seen that the variation of the transverse astigmatism position is + -0.04 mm; the distortion diagrams of five different wavelengths (470 nm, 510nm, 555nm, 610nm and 650 nm) are plotted on the right side of fig. 15, and it can be seen that the distortion phase difference is maintained within 2.0% in example 4, and a good imaging effect is achieved.
In embodiment 4, the optical parameters are shown in fig. 16, and the aspheric coefficients in the object-side surface and the image-side surface are shown in fig. 17; to obtain: the length of the length (TTL) on the optical axis from the object-side surface 411 to the image-forming surface 480 of the first lens is 4.401mm, the effective Focal Length (FL) is 3.61mm, and the half-maximum field angle (HFOV) is 38.4 degrees, where
Has a value of 1.56, an aperture value (Fno) of 2.0,
the value of (A) was 35.5.
The optical lens group comprises 6 lenses, the first lens has positive refractive power, and the area of the image side surface, which is positioned near the optical axis, is provided with a concave surface part, so that the field angle is increased; the second lens element with negative refractive power has a concave surface portion located at a region near the optical axis on the object-side surface and a concave surface portion located at a region near the optical axis on the image-side surface, so that aberration generated by the first lens element can be corrected; the third lens element and the fourth lens element have refractive power, the object-side surface of the third lens element has a concave surface portion near the optical axis, and the image-side surface of the fourth lens element has a convex surface portion near the optical axis, so that aberration generated by the second lens element can be corrected; the fifth lens element with positive refractive power has a concave portion on the object-side surface and a convex portion on the image-side surface, wherein the concave portion is located in a region near the optical axis, and the convex portion is located in a region near the optical axis, so that the aberration generated by the fourth lens element can be corrected; the sixth lens element with negative refractive power has a concave portion on the object-side surface and a concave portion on the image-side surface, which are located in the vicinity of the optical axis, and is favorable for correcting optical chromatic aberration caused by a large aperture.
At least one of the object side surface and the image side surface of the first lens element to the sixth 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 sixth lens element have at least one inflection point, which is favorable for correcting the aberration of the area near the circumference of the lens group.
When 1.0 is satisfied<
<And 2.2, the overall length of the lens group is favorably reduced, and the imaging quality of the lens group is ensured.
When the condition is more than or equal to 0
<And when the condition is 36, the overall length of the whole lens group is favorably 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, a fifth lens element and a sixth lens element, wherein the first to sixth lens elements each have refractive power, and each of the first to sixth lens elements 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 second lens element with negative refractive power has a concave surface portion on the object-side surface and a concave surface portion on the image-side surface, wherein at least one surface of the second lens element is aspheric;
the third lens element with refractive power has an object-side surface including a concave surface portion located in a region near an optical axis, and at least one surface of the concave surface portion is aspheric;
the fourth lens element with refractive power has an image-side surface including a convex surface portion located in a region near the optical axis, wherein at least one surface of the convex surface portion is aspheric;
the fifth lens element with positive refractive power has a concave surface portion located in a region near an optical axis on an object-side surface and a convex surface portion located in a region near the optical axis on an image-side surface, and at least one surface of the fifth lens element is aspheric;
the sixth lens element with negative refractive power has an object-side surface having a concave surface portion located in a region near the optical axis, an image-side surface having a concave surface portion located in a region near the optical axis, and at least one of the object-side surface and the image-side surface having an inflection point, wherein at least one of the object-side surface and the image-side surface is aspheric;
therein, 1.0<
<2.25 and Fno more than or equal to 1.75 is less than or equal to 2.2;
where T3 represents the center thickness of the third lens on the optical axis, T4 represents the center thickness of the fourth lens on the optical axis, T34 represents the gap between the third lens and the fourth lens on the optical axis, and Fno represents the aperture value.
2. 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, a fifth lens element and a sixth lens element, wherein the first to sixth lens elements each have refractive power, and each of the first to sixth lens elements 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 second lens element with negative refractive power has a concave surface portion on the object-side surface and a concave surface portion on the image-side surface, wherein at least one surface of the second lens element is aspheric;
the third lens element with refractive power has an object-side surface including a concave surface portion located in a region near an optical axis, and at least one surface of the concave surface portion is aspheric;
the fourth lens element with refractive power has an image-side surface including a convex surface portion located in a region near the optical axis, wherein at least one surface of the convex surface portion is aspheric;
the fifth lens element with positive refractive power has a concave surface portion located in a region near an optical axis on an object-side surface and a convex surface portion located in a region near the optical axis on an image-side surface, and at least one surface of the fifth lens element is aspheric;
the sixth lens element with negative refractive power has an object-side surface having a concave surface portion located in a region near the optical axis, an image-side surface having a concave surface portion located in a region near the optical axis, and at least one of the object-side surface and the image-side surface having an inflection point, wherein at least one of the object-side surface and the image-side surface is aspheric;
therein, 1.0<
<2.25 and 0 ≤
<36；
Where T3 represents the central thickness of the third lens on the optical axis, T4 represents the central thickness of the fourth lens on the optical axis, T34 represents the gap between the third lens and the fourth lens on the optical axis, V2 is the second lens Abbe number, and V4 is the fourth lens Abbe number.
3. The optical lens assembly as claimed in claim 1 or 2, wherein the refractive powers of the third and fourth lens elements are opposite.
4. The optical lens assembly of claim 1 or 2, wherein the first to sixth lenses are made of plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920731969.4U CN210038211U (en) | 2019-05-21 | 2019-05-21 | Optical lens group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920731969.4U CN210038211U (en) | 2019-05-21 | 2019-05-21 | Optical lens group |
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| Publication Number | Publication Date |
|---|---|
| CN210038211U true CN210038211U (en) | 2020-02-07 |
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ID=69367171
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920731969.4U Active CN210038211U (en) | 2019-05-21 | 2019-05-21 | Optical lens group |
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| CN (1) | CN210038211U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244435A (en) * | 2019-05-21 | 2019-09-17 | 江苏光腾光学有限公司 | A kind of optical mirror slip group |
-
2019
- 2019-05-21 CN CN201920731969.4U patent/CN210038211U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244435A (en) * | 2019-05-21 | 2019-09-17 | 江苏光腾光学有限公司 | A kind of optical mirror slip group |
| CN110244435B (en) * | 2019-05-21 | 2024-04-16 | 江苏光腾光学有限公司 | Optical lens group |
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