CN113031202A - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN113031202A CN113031202A CN201911250161.5A CN201911250161A CN113031202A CN 113031202 A CN113031202 A CN 113031202A CN 201911250161 A CN201911250161 A CN 201911250161A CN 113031202 A CN113031202 A CN 113031202A
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- G02B13/18—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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Abstract
A wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens has a refractive power of a meniscus lens. The second lens has a negative refractive power and is a meniscus lens. The third lens has a refractive power. The fourth lens has positive refractive power. The fifth lens has refractive power and comprises a convex surface facing the object side. The sixth lens has a positive refractive power. The seventh lens has refractive power and comprises a concave surface facing the object side. The eighth lens element has refractive power and includes a convex surface facing the image side. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element and the eighth lens element are sequentially disposed along an optical axis from an object side to an image side, and respective positions of the lens elements are fixed.
Description
Technical Field
The invention relates to a wide-angle lens.
Background
The current wide-angle lens cannot meet the current requirements, and needs another wide-angle lens with a new framework to meet the requirements of miniaturization, large aperture, high resolution and environmental temperature change resistance.
Disclosure of Invention
The present invention is directed to a wide-angle lens, which has a short total length, a small aperture value, a high resolution, and resistance to ambient temperature change, but still has good optical performance.
The present invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has a refractive power of a meniscus lens. The second lens has a negative refractive power and is a meniscus lens. The third lens has a refractive power. The fourth lens has positive refractive power. The fifth lens has refractive power and comprises a convex surface facing the object side. The sixth lens has a positive refractive power. The seventh lens has refractive power and comprises a concave surface facing the object side. The eighth lens element has refractive power and includes a convex surface facing the image side. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element and the eighth lens element are sequentially disposed along an optical axis from an object side to an image side, and respective positions of the lens elements are fixed.
Wherein the sixth lens is cemented with the seventh lens.
The image sensor can further include a ninth lens element disposed between the seventh lens element and the image side, the ninth lens element having negative refractive power and including a concave surface facing the object side.
Wherein the eighth lens is cemented with the ninth lens.
The fourth lens element with positive refractive power includes a convex surface facing the object side and another convex surface facing the image side.
The first lens element with positive refractive power has a convex surface facing the object side and a concave surface facing the image side, the second lens element with a convex surface facing the object side and a concave surface facing the image side, the third lens element with negative refractive power has a concave surface facing the image side, the fourth lens element with a convex surface facing the image side, the fifth lens element with positive refractive power has a convex surface facing the object side and another convex surface facing the image side, the seventh lens element with negative refractive power has a convex surface facing the object side, and the eighth lens element with positive refractive power may further have a convex surface facing the object side.
The fifth lens element can further comprise a convex surface facing the object side and another convex surface facing the image side, the seventh lens element has negative refractive power, the eighth lens element has positive refractive power, and the eighth lens element can further comprise a concave surface facing the object side and another convex surface facing the image side.
The wide-angle lens meets the following conditions: TTL/f is more than 5.5 and less than 10; TTL/R is more than 1.311Less than 2.6; wherein f is the effective focal length of the wide-angle lens, R11The radius of curvature of the object-side surface of the first lens element, TTL is the distance between the object-side surface of the first lens element and the image plane on the optical axis.
The wide-angle lens meets the following conditions: 0.03 < | f12/f34Less than 1.7; wherein f is12Is the combined effective focal length of the first lens and the second lens, f34Is the combined effective focal length of the third lens and the fourth lens.
The wide-angle lens meets the following conditions: 64.3>Vd1>30；54.5>Vd2>35; wherein, Vd1Abbe number of the first lens, Vd2Is the abbe number of the second lens.
When TTL/f satisfies the above condition, the wide-angle lens can be effectively balancedThe visual angle and the total length are favorable for more various application fields. When TTL/R11When the above conditions are satisfied, the optical total length can be shortened, and the characteristic of miniaturization of the wide-angle lens can be enhanced. When f12/f34When the condition is met, the refractive power distribution of the side end and the middle section of the lens can be balanced, so that the size of the visual angle of the lens can be effectively controlled. When Vd is measured1When the above conditions are satisfied, the first lens can have an appropriate abbe number to correct chromatic aberration. When Vd is measured2When the above conditions are satisfied, the second lens can have an appropriate abbe number to correct chromatic aberration.
The wide-angle lens has the following beneficial effects: the lens has the advantages of short total length, small aperture value, high resolution, environmental temperature change resistance and good optical performance.
Drawings
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Fig. 1 is a lens arrangement diagram of a first embodiment of a wide-angle lens according to the present invention.
Fig. 2A, 2B, 2C, 2D, 2E, 2F, and 2G are a Field Curvature (Field Curvature) diagram, a Distortion (Distortion) diagram, a Lateral chromatic aberration (Lateral Color) diagram, a Relative Illumination (Relative Illumination) diagram, a Spot (Spot) diagram, a Modulation Transfer Function (Modulation Transfer Function) diagram, and a defocus Modulation Transfer Function (Through Focus Modulation Transfer Function) diagram, respectively, of the first embodiment of the wide-angle lens according to the present invention.
Fig. 3 is a lens arrangement diagram of a second embodiment of a wide-angle lens according to the present invention.
Fig. 4A, 4B, 4C, 4D, 4E, 4F, and 4G are a field curvature diagram, a distortion diagram, a lateral chromatic aberration diagram, a relative illumination diagram, a light point diagram, a modulation conversion function diagram, and a defocus modulation conversion function diagram, respectively, according to a second embodiment of the wide-angle lens of the present invention.
Fig. 5 is a lens arrangement diagram of a third embodiment of a wide-angle lens according to the present invention.
Fig. 6A, 6B, 6C, 6D, 6E, 6F, and 6G are a field curvature diagram, a distortion diagram, a lateral chromatic aberration diagram, a relative illumination diagram, a light point diagram, a modulation conversion function diagram, and a defocus modulation conversion function diagram, respectively, according to a third embodiment of the wide-angle lens of the present invention.
Fig. 7 is a lens arrangement diagram of a fourth embodiment of a wide-angle lens according to the present invention.
Fig. 8A, 8B, 8C, 8D, 8E, 8F, and 8G are a field curvature diagram, a distortion diagram, a lateral chromatic aberration diagram, a relative illumination diagram, a light point diagram, a modulation conversion function diagram, and a defocus modulation conversion function diagram, respectively, according to a fourth embodiment of the wide-angle lens of the present invention.
Fig. 9 is a lens arrangement diagram of a fifth embodiment of a wide-angle lens according to the present invention.
Fig. 10A, 10B, 10C, 10D, 10E, 10F, and 10G are a field curvature diagram, a distortion diagram, a lateral chromatic aberration diagram, a relative illumination diagram, a light point diagram, a modulation conversion function diagram, and a defocus modulation conversion function diagram, respectively, according to a fifth embodiment of the wide-angle lens of the present invention.
Fig. 11 is a lens arrangement diagram of a sixth embodiment of a wide-angle lens according to the present invention.
Fig. 12A, 12B, 12C, 12D, 12E, 12F, and 12G are a field curvature diagram, a distortion diagram, a lateral chromatic aberration diagram, a relative illumination diagram, a light point diagram, a modulation conversion function diagram, and a defocus modulation conversion function diagram, respectively, according to a sixth embodiment of the wide-angle lens of the present invention.
Fig. 13 is a lens arrangement diagram of a seventh embodiment of a wide-angle lens according to the present invention.
Fig. 14A, 14B, 14C, 14D, and 14E are a Longitudinal Aberration (Longitudinal Aberration) diagram, a field curvature diagram, a distortion diagram, a lateral Aberration diagram, and a modulation transfer function diagram, respectively, of a seventh embodiment of the wide-angle lens according to the present invention.
Fig. 15 is a lens arrangement diagram of an eighth embodiment of a wide-angle lens according to the present invention.
Fig. 16A, 16B, 16C, 16D and 16E are a longitudinal aberration diagram, a field curvature diagram, a distortion diagram, a lateral aberration diagram and a modulation transfer function diagram of the eighth embodiment of the wide-angle lens according to the invention, respectively.
Fig. 17 is a lens arrangement diagram of a ninth embodiment of the wide-angle lens according to the present invention.
Fig. 18A, 18B, 18C, 18D, and 18E are a longitudinal aberration diagram, a field curvature diagram, a distortion diagram, a lateral aberration diagram, and a modulation transfer function diagram, respectively, of a ninth embodiment of the wide-angle lens according to the invention.
Detailed Description
The present invention provides a wide-angle lens, including: the first lens has refractive power and is a meniscus lens; the second lens has negative refractive power, and is a meniscus lens; the third lens has refractive power; the fourth lens has positive refractive power; the fifth lens has refractive power, and the fifth lens comprises a convex surface facing the object side; the sixth lens has positive refractive power; the seventh lens has refractive power, and the seventh lens comprises a concave surface facing the object side; the eighth lens element with refractive power has a convex surface facing the image side; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element and the eighth lens element are sequentially disposed along an optical axis from an object side to an image side, and respective positions of the lens elements are fixed.
The object-side surface of the first lens element can be convex; therefore, the light receiving device is beneficial to receiving light, reduces the surface reflection of the wide-field light and improves the illumination of the wide field. The surface of the image side of the first lens can be a concave surface; this helps reduce the occurrence of astigmatism. The second lens may have a negative refractive power; therefore, the aberration and the distortion generated by the first lens are corrected. The object side surface of the second lens can be a convex surface; therefore, the surface shape of the second lens can be adjusted, and the incident light with a large visual angle can be favorably received and smoothly transmitted in the wide-angle lens. The image side surface of the second lens can be a concave surface; this helps reduce the occurrence of astigmatism. The fifth lens may have a positive refractive power; therefore, the positive refractive power of the wide-angle lens is uniformly distributed, so that the aberration generated by a single lens is reduced. The object-side surface of the fifth lens element can be convex; therefore, the surface shape of the fifth lens can be adjusted, and off-axis aberration such as image bending and the like can be corrected. The sixth lens element has positive refractive power, and has a convex object-side surface and a convex image-side surface; therefore, the light-gathering capacity of the wide-angle lens can be provided, and the total length of the wide-angle lens is reduced so as to meet the requirement of miniaturization. The seventh lens may have a negative refractive power; therefore, the positive refractive power of the sixth lens is balanced, and chromatic aberration is effectively corrected. The object side surface of the seventh lens element can be concave; thereby, the color difference can be corrected. The eighth lens may have a positive refractive power; therefore, the seventh lens with stronger negative refractive power is matched, and the peripheral aberration is corrected. The image side surface of the eighth lens element can be convex; thereby, the total length of the wide-angle lens is further reduced. In the wide-angle lens disclosed by the invention, the diaphragm is configured as a middle diaphragm, which is beneficial to enlarging the field angle of the wide-angle lens. The middle diaphragm means that the diaphragm is arranged between the first lens and the imaging surface.
Please refer to the following tables i, iii, iv, nineth, eleventh, twelfth, fourteenth, fifteenth, seventeenth, eighteenth, twenty and twenty-one, wherein the tables i, iii, iv, seventeenth, nineteenth, eleventh, fourteenth, seventeenth and twenty are the related parameter tables of the lenses according to the first to ninth embodiments of the wide-angle lens of the present invention, respectively, and the tables twelve, fifteenth, eighteen and twenty-one are the related parameter tables of the aspheric surfaces of the aspheric lenses of the tables eleven, fourteenth, seventeenth and twenty, respectively.
Fig. 1, 3, 5, 7, 9, 11, 13, 15, and 17 are schematic lens configurations of first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth embodiments of the wide-angle lens according to the present invention, respectively, wherein the first lenses L11, L21, L31, L41, L51, L61, L71, L81, and L91 are meniscus lenses made of glass material, and have concave object side surfaces S11, and are spherical surfaces, and all of the object side surfaces S11.
The second lenses L12, L22, L32, L42, L52, L62, L72, L82, and L92 are meniscus lenses having negative refractive power, and are made of glass materials, and the object side surfaces S13, S13 are convex surfaces, the image side surfaces S13, and S13 are concave surfaces, and the object side surfaces S13, and S13 are spherical surfaces.
The third lenses L13, L23, L33, L43, L53, L63, L73, L83, and L93 have refractive power and are made of glass.
The fourth lenses L14, L24, L34, L44, L54, L64, L74, L84, and L94 have positive refractive power and are made of glass.
The fifth lenses L15, L25, L35, L45, L55, L65, L75, L85, and L95 have positive refractive power, are made of glass material, and have convex object-side surfaces S19, S29, S39, S49, S59, S69, S710, S810, and S910, and spherical object-side surfaces S19, S29, S39, S49, S59, S69, S710, S810, and S910 and image-side surfaces S110, S210, S310, S410, S510, S610, S711, S811, and S911.
The sixth lenses L16, L26, L36, L46, L56, L66, L76, L86, and L96 are biconvex lenses having positive refractive power, and are made of glass material, the object side surfaces S112, S212, S312, S412, S512, S612, S712, S812, and S912 are convex surfaces, the image side surfaces S113, S213, S313, S413, S513, S613, S713, S813, and S913 are convex surfaces, and the object side surfaces S112, S212, S312, S412, S512, S612, S712, S812, S912 and the image side surfaces S113, S213, S313, S413, S513, S613, S713, S813, and S913 are spherical surfaces.
The seventh lenses L17, L27, L37, L47, L57, L67, L77, L87, and L97 have negative refractive power, are made of glass material, and have concave object-side surfaces S113, S213, S313, S413, S513, S613, S713, S813, and S913, and spherical object-side surfaces S113, S213, S313, S413, S513, S613, S713, S813, and S913 and image-side surfaces S114, S214, S314, S414, S514, S614, S714, S814, and S914.
The eighth lenses L18, L28, L38, L48, L58, L68, L78, L88, and L98 have positive refractive power, are made of glass material, and have convex image side surfaces S116, S216, S316, S416, S516, S616, S716, S816, and S916.
Sixth lenses L16, L26, L36, L46, L56, L66, L76, L86, L96 are cemented with seventh lenses L17, L27, L37, L47, L57, L67, L77, L87, L97, respectively.
In addition, the wide- angle lenses 1, 2, 3, 4, 5, 6, 7, 8, 9 satisfy at least one of the following conditions:
5.5＜TTL/f＜10 (1)
1.3＜TTL/R11＜2.6 (2)
0.03＜|f12/f34|＜1.7 (3)
64.3>Vd1>30 (4)
54.5>Vd2>35 (5)
where f is the effective focal length of the wide-angle lenses 1, 2, 3, 4, 5, 6, 7, 8, 9 in the first to ninth embodiments, and f12In the first to ninth embodiments, the combined effective focal length of the first lens L11, L21, L31, L41, L51, L61, L71, L81, L91 and the second lens L12, L22, L32, L42, L52, L62, L72, L82, L92, f34In the first to ninth embodiments, the combined effective focal length of the third lens L13, L23, L33, L43, L53, L63, L73, L83, L93 and the fourth lens L14, L24, L34, L44, L54, L64, L74, L84, L94, R11In the first to ninth embodiments, the object side surfaces S, S of the first lenses L, L are radii of curvature, TTL is the distance between the object side surfaces S, S of the first lenses L, L to the imaging surfaces IMA, OA, VD, OA, and the distance between the object side surfaces S, S and S of the first lenses L, and L to the imaging1Abbe numbers, Vd, of the first lenses L11, L21, L31, L41, L51, L61, L71, L81, and L91 in the first to ninth embodiments2In the first to ninth embodiments, abbe coefficients of the second lenses L12, L22, L32, L42, L52, L62, L72, L82, and L92. So that the wide- angle lenses 1, 2, 3, 4, 5, 6,7. 8, 9 can effective lens total length of reducing, effective aperture value of reducing, effectual improvement resolution ratio, effective ambient temperature change of resisting, effectual correction aberration, effectual correction chromatic aberration.
A first embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to fig. 1, the wide-angle lens 1 includes, in order from an object side to an image side along an optical axis OA1, a first lens element L11, a second lens element L12, a third lens element L13, a fourth lens element L14, a fifth lens element L15, an aperture stop ST1, a sixth lens element L16, a seventh lens element L17, an eighth lens element L18, a ninth lens element L19, a filter OF1, and a protective glass CG 1. In imaging, light from the object side is finally imaged on the imaging surface IMA 1. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L11 has positive refractive power;
the third lens element L13 is a biconcave lens element with negative refractive power, and has a concave object-side surface S15, a concave image-side surface S16, and spherical object-side and image-side surfaces S15 and S16, respectively;
the fourth lens element L14 is a meniscus lens element with a concave object-side surface S17, a convex image-side surface S18, and spherical object-side surfaces S17 and S18;
the fifth lens element L15 is a biconvex lens element, and the image-side surface S110 thereof is convex;
the seventh lens element L17 is a meniscus lens element with the image-side surface S114 being convex;
the eighth lens element L18 is a biconvex lens element, in which the object-side surface S115 is a convex surface, and both the object-side surface S115 and the image-side surface S116 are spherical surfaces;
the ninth lens element L19 is a meniscus lens element with negative refractive power and made of glass, wherein the object-side surface S116 is concave, the image-side surface S117 is convex, and both the object-side surface S116 and the image-side surface S117 are spherical surfaces;
the eighth lens L18 is cemented with the ninth lens L19;
the filter OF1 has an object-side surface S118 and an image-side surface S119 that are both planar;
the object-side surface S120 and the image-side surface S121 of the protective glass CG1 are both planar;
by using the design of the lens, the aperture ST1 and at least one of the conditions (1) to (5), the wide-angle lens 1 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist the environmental temperature change, effectively correct the aberration, and effectively correct the chromatic aberration.
If the value of TTL/f is greater than 10 in condition (1), it is difficult to achieve the purpose of downsizing the lens. Therefore, the value of TTL/f is at least less than 10, so the best effect range is 5.5 < TTL/f < 10, and the condition of best lens miniaturization is met in the range.
Table one is a table of relevant parameters of each lens of the wide-angle lens 1 in fig. 1.
Table two shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table two that the wide-angle lens 1 of the first embodiment can satisfy the requirements of the conditions (1) to (5).
Watch two
| f12 | -20.245mm | f34 | -13.7mm | ||
| TTL/f | 9.722 | TTL/R11 | 1.917 | |f12/f34| | 1.478 |
| Vd1 | 62.9 | Vd2 | 46.5 |
In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirement, and as can be seen from fig. 2A, the field curvature of the wide-angle lens 1 of the first embodiment is between-0.01 mm and 0.04 mm. As can be seen from fig. 2B, the wide-angle lens 1 of the first embodiment has a distortion of-8% to 0%. As can be seen from fig. 2C, the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between-0.5 μm and 1.7 μm. As shown in fig. 2D, the relative illumination of the wide-angle lens 1 of the first embodiment is between 0.58 and 1.0. As can be seen from fig. 2E, the wide-angle lens 1 of the first embodiment has a Root Mean Square (Root Mean Square) radius of the light spot of 0.912 μm and a geometric (Geometrical) radius of 3.298 μm when the image height is 0.000mm, has a Root Mean Square (Root Mean Square) radius of 1.479 μm and a geometric (Geometrical) radius of 6.950 μm when the image height is 2.778mm, and has a Root Mean Square (Root Mean Square) radius of 1.893 μm and a geometric (Geometrical) radius of 11.756 μm when the image height is 3.928 mm. As shown in fig. 2F, the wide-angle lens 1 of the first embodiment has a modulation transfer function value between 0.60 and 1.0. As shown in fig. 2G, the wide-angle lens 1 of the first embodiment has a modulation transfer function value between 0.0 and 0.76 when the focus offset is between-0.05 mm and 0.05 mm.
It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the relative illumination, the lens resolution and the focal depth can also meet the requirements, so that better optical performance can be obtained.
Referring to fig. 3, fig. 3 is a schematic lens configuration diagram of a wide-angle lens according to a second embodiment of the invention. The wide-angle lens 2 includes, in order from an object side to an image side along an optical axis OA2, a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, a fifth lens L25, an aperture ST2, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29, a filter OF2, and a protective glass CG 2. In imaging, light from the object side is finally imaged on the imaging surface IMA 2. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L21 has positive refractive power;
the third lens element L23 is a meniscus lens element with negative refractive power, the object-side surface S25 being convex, the image-side surface S26 being concave, and both the object-side surface S25 and the image-side surface S26 being spherical surfaces;
the fourth lens element L24 is a meniscus lens element with a concave object-side surface S27, a convex image-side surface S28, and spherical object-side surfaces S27 and S28;
the fifth lens element L25 is a biconvex lens element, and the image-side surface S210 thereof is convex;
the seventh lens element L27 is a meniscus lens element with the image-side surface S214 being convex;
the eighth lens element L28 is a biconvex lens element, in which the object-side surface S215 is a convex surface, and both the object-side surface S215 and the image-side surface S216 are spherical surfaces;
the ninth lens element L29 is a meniscus lens element with negative refractive power and made of glass, wherein the object-side surface S216 is concave, the image-side surface S217 is convex, and both the object-side surface S216 and the image-side surface S217 are spherical surfaces;
the eighth lens L28 is cemented with the ninth lens L29;
the filter OF2 has an object-side surface S218 and an image-side surface S219 that are both planar;
the object side surface S220 and the image side surface S221 of the protective glass CG2 are both planes;
by using the design of the lens, the aperture ST2 and at least one of the conditions (1) to (5), the wide-angle lens 2 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist the environmental temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
If condition (2) TTL/R11If the value of (b) is more than 2.6, it is difficult to shorten the total lens length. Thus, TTL/R11The value of (A) is at least less than 10, so that the optimum effect range is 1.3 < TTL/R11And < 2.6, and the condition of optimal lens miniaturization is met in the range.
Table three is a table of the relevant parameters of each lens of the wide-angle lens 2 in fig. 3.
Watch III
Table four shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen that the wide-angle lens 2 of the second embodiment can satisfy the requirements of the conditions (1) to (5).
Watch four
| f12 | -18.599mm | f34 | -13.133mm | ||
| TTL/f | 9.773 | TTL/R11 | 2.472 | |f12/f34| | 1.416 |
| Vd1 | 58.9 | Vd2 | 46.5 |
In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirement, and as can be seen from fig. 4A, the field curvature of the wide-angle lens 2 of the second embodiment is between-0.03 mm and 0.04 mm. As can be seen from fig. 4B, the wide-angle lens 2 of the second embodiment has a distortion of-8% to 0%. As can be seen from fig. 4C, the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between-0.5 μm and 1.7 μm. As shown in fig. 4D, the relative illumination of the wide-angle lens 2 of the second embodiment is between 0.68 and 1.0. As can be seen from fig. 4E, the wide-angle lens 2 of the second embodiment has a light spot with a root mean square radius of 1.192 μm and a geometric radius of 6.500 μm when the image height is 0.000mm, 2.110 μm and 11.556 μm when the image height is 2.778mm, 3.310 μm and 15.712 μm when the image height is 3.928 mm. As shown in fig. 4F, the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.55 and 1.0. As can be seen from fig. 4G, the wide-angle lens 2 of the second embodiment has a modulation transfer function value between 0.0 and 0.75 when the focus offset is between-0.05 mm and 0.05 mm.
It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the relative illumination, the lens resolution and the focal depth can also meet the requirements, so that better optical performance can be obtained.
Referring to fig. 5, fig. 5 is a schematic lens configuration diagram of a wide-angle lens according to a third embodiment of the invention. The wide-angle lens 3 includes, in order from the object side to the image side along an optical axis OA3, a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, a fifth lens L35, an aperture ST3, a sixth lens L36, a seventh lens L37, an eighth lens L38, a ninth lens L39, a filter OF3, and a protective glass CG 3. In imaging, light from the object side is finally imaged on the imaging surface IMA 3. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L31 has positive refractive power;
the third lens element L33 is a biconcave lens element with negative refractive power, and has a concave object-side surface S35, a concave image-side surface S36, and spherical object-side and image-side surfaces S35 and S36, respectively;
the fourth lens element L34 is a meniscus lens element with a concave object-side surface S37, a convex image-side surface S38, and spherical object-side surfaces S37 and S38;
the fifth lens element L35 is a meniscus lens element with a concave image-side surface S310;
the seventh lens element L37 is a meniscus lens element with the image-side surface S314 being convex;
the eighth lens element L38 is a biconvex lens element, in which the object-side surface S315 is a convex surface, and both the object-side surface S315 and the image-side surface S316 are spherical surfaces;
the ninth lens element L39 is a meniscus lens element with negative refractive power and made of glass, wherein the object-side surface S316 is concave, the image-side surface S317 is convex, and the object-side surface S316 and the image-side surface S317 are spherical surfaces;
the eighth lens L38 is cemented with the ninth lens L39;
the filter OF3 has an object-side surface S318 and an image-side surface S319 that are both planar;
the object-side surface S320 and the image-side surface S321 of the protective glass CG3 are both planar;
by using the design of the lens, the stop ST3 and at least one of the conditions (1) to (5), the wide-angle lens 3 can effectively reduce the total length of the lens, effectively reduce the stop value, effectively improve the resolution, effectively resist the ambient temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
If the condition (3) | f12/f34If the numerical value of | is greater than 1.7, the power distribution capability of balancing the side end and the middle section of the lens object is reduced. Therefore, | f12/f34The value of | must be at least less than 1.7, so the optimum effect range is 0.03 < | f12/f34If the | is less than 1.7, the size of the visual angle of the lens can be effectively controlled according with the range.
Table five is a table of the relevant parameters of each lens of the wide-angle lens 3 in fig. 5.
Watch five
Table six shows the relevant parameter values of the wide-angle lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table six that the wide-angle lens 3 of the third embodiment can satisfy the requirements of the conditions (1) to (5).
Watch six
| f12 | -23.259mm | f34 | -14.807mm | ||
| TTL/f | 8.722 | TTL/R11 | 1.624 | |f12/f34| | 1.571 |
| Vd1 | 62.9 | Vd2 | 49.5 |
In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirement, and as can be seen from fig. 6A, the field curvature of the wide-angle lens 3 of the third embodiment is between-0.02 mm and 0.05 mm. As can be seen from fig. 6B, the wide-angle lens 3 of the third embodiment has a distortion of-8% to 0%. As can be seen from fig. 6C, the lateral chromatic aberration of the wide-angle lens 3 of the third embodiment is between-0.5 μm and 1.3 μm. As shown in fig. 6D, the wide-angle lens 3 of the third embodiment has a relative illumination intensity between 0.73 and 1.0. As can be seen from fig. 6E, the wide-angle lens 3 of the third embodiment has a light spot with a root mean square radius of 1.141 μm and a geometric radius of 2.847 μm when the image height is 0.000mm, a light spot with a root mean square radius of 1.816 μm and a geometric radius of 8.275 μm when the image height is 2.778mm, and a light spot with a root mean square radius of 3.448 μm and a geometric radius of 16.413 μm when the image height is 3.928 mm. As shown in fig. 6F, the wide-angle lens 3 of the third embodiment has a modulation transfer function value between 0.58 and 1.0. As can be seen from fig. 6G, the wide-angle lens 3 of the third embodiment has a modulation transfer function value between 0.0 and 0.72 when the focus offset is between-0.05 mm and 0.05 mm.
It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the relative illumination, the lens resolution and the focal depth can also meet the requirements, so that better optical performance can be obtained.
Referring to fig. 7, fig. 7 is a schematic lens configuration diagram of a wide-angle lens according to a fourth embodiment of the invention. The wide-angle lens 4 includes, in order from the object side to the image side along an optical axis OA4, a first lens L41, a second lens L42, a third lens L43, a fourth lens L44, a fifth lens L45, an aperture ST4, a sixth lens L46, a seventh lens L47, an eighth lens L48, a ninth lens L49, and a cover glass CG 4. In imaging, light from the object side is finally imaged on the imaging surface IMA 4. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L41 has positive refractive power;
the third lens element L43 is a biconcave lens element with negative refractive power, and has a concave object-side surface S45, a concave image-side surface S46, and spherical object-side and image-side surfaces S45 and S46, respectively;
the fourth lens element L44 is a meniscus lens element with a concave object-side surface S47, a convex image-side surface S48, and spherical object-side surfaces S47 and S48;
the fifth lens element L45 is a biconvex lens element, and the image-side surface S410 thereof is a convex surface;
the seventh lens element L47 is a meniscus lens element with the image-side surface S414 being convex;
the eighth lens element L48 is a biconvex lens element, in which the object-side surface S415 is a convex surface, and both the object-side surface S415 and the image-side surface S416 are spherical surfaces;
the ninth lens element L49 is a meniscus lens element with negative refractive power and made of glass material, wherein the object-side surface S416 is concave, the image-side surface S417 is convex, and both the object-side surface S416 and the image-side surface S417 are spherical surfaces;
the eighth lens L48 is cemented with the ninth lens L49;
the object side surface S418 and the image side surface S419 of the cover glass CG4 are both planar;
by using the design of the lens, the stop ST4 and at least one of the conditions (1) to (5), the wide-angle lens 4 can effectively reduce the total length of the lens, effectively reduce the stop value, effectively improve the resolution, effectively resist the ambient temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
If condition (4) Vd1If the numerical value of (2) is less than 30, the achromatic function is not good. Thus, Vd1The value of (A) is at least greater than 30, so that the optimum effect range is 64.3>Vd1>If the number of pixels is within this range, the optimum achromatic condition is satisfied at 30.
Table seven is a table of the relevant parameters of each lens of the wide-angle lens 4 in fig. 7.
Watch seven
Table eight shows the relevant parameter values of the wide-angle lens 4 of the fourth embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table eight that the wide-angle lens 4 of the fourth embodiment can satisfy the requirements of the conditions (1) to (5).
Table eight
| f12 | -21.151mm | f34 | -13.404mm | ||
| TTL/f | 9.708 | TTL/R11 | 2.048 | |f12/f34| | 1.578 |
| Vd1 | 61.2 | Vd2 | 49.5 |
In addition, the optical performance of the wide-angle lens 4 of the fourth embodiment can also meet the requirement, and as can be seen from fig. 8A, the field curvature of the wide-angle lens 4 of the fourth embodiment is between-0.015 mm and 0.035 mm. As can be seen from fig. 8B, the wide-angle lens 4 of the fourth embodiment has a distortion of-8% to 0%. As can be seen from fig. 8C, the lateral chromatic aberration of the wide-angle lens 4 of the fourth embodiment is between-0.6 μm and 1.6 μm. As shown in fig. 8D, the relative illumination of the wide-angle lens 4 of the fourth embodiment is between 0.58 and 1.0. As can be seen from fig. 8E, the wide-angle lens 4 of the fourth embodiment has a light spot with a root mean square radius of 0.824 μm and a geometric radius of 3.083 μm when the image height is 0.000mm, a light spot with a root mean square radius of 1.389 μm and a geometric radius of 6.870 μm when the image height is 2.750mm, and a light spot with a root mean square radius of 1.973 μm and a geometric radius of 11.821 μm when the image height is 3.928 mm. As shown in fig. 8F, the wide-angle lens 4 of the fourth embodiment has a modulation transfer function value between 0.58 and 1.0. As can be seen from fig. 8G, the wide-angle lens 4 of the fourth embodiment has a modulation transfer function value between 0.0 and 0.72 when the focus offset is between-0.05 mm and 0.05 mm.
It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 4 of the fourth embodiment can be effectively corrected, and the relative illumination, the lens resolution and the focal depth can also meet the requirements, so that better optical performance can be obtained.
Referring to fig. 9, fig. 9 is a schematic lens configuration diagram of a wide-angle lens according to a fifth embodiment of the invention. The wide-angle lens 5 includes, in order from the object side to the image side along an optical axis OA5, a first lens L51, a second lens L52, a third lens L53, a fourth lens L54, a fifth lens L55, an aperture ST5, a sixth lens L56, a seventh lens L57, an eighth lens L58, a ninth lens L59, a tenth lens L510, and a protective glass CG 5. In imaging, light from the object side is finally imaged on the imaging surface IMA 5. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L51 has positive refractive power;
the third lens element L53 is a biconcave lens element with negative refractive power, and has a concave object-side surface S55, a concave image-side surface S56, and spherical object-side and image-side surfaces S55 and S56, respectively;
the fourth lens element L54 is a biconvex lens element, in which the object-side surface S57 is convex, the image-side surface S58 is convex, and both the object-side surface S57 and the image-side surface S58 are spherical surfaces;
the fifth lens element L55 is a meniscus lens element with the image-side surface S510 being concave;
the seventh lens element L57 is a biconcave lens element, and the image-side surface S514 is concave;
the eighth lens element L58 is a biconvex lens element, in which the object-side surface S515 is a convex surface, and both the object-side surface S515 and the image-side surface S516 are spherical surfaces;
the ninth lens element L59 is a biconcave lens element with negative refractive power and made of glass, and has a concave object-side surface S517 and a concave image-side surface S518, both of which are spherical surfaces;
the tenth lens element L510 is a biconvex lens element with positive refractive power, and is made of glass material, and has a convex object-side surface S519, a convex image-side surface S520, and both the object-side surface S519 and the image-side surface S520 being spherical surfaces;
the object-side surface S521 and the image-side surface S522 of the cover glass CG5 are both planar;
by using the design of the lens, the aperture ST5 and at least one of the conditions (1) to (5), the wide-angle lens 5 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist the environmental temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
If the following conditions are satisfied: TTL/f is more than 5.5 and less than 10. Therefore, the positive refractive power of the fifth lens element L55 and the positive refractive power of the object-side surface S59, the positive refractive power of the sixth lens element L56 and the shape configurations of the object-side surface S512 and the image-side surface S513, the seventh lens element L57 and the object-side surface S513, and the eighth lens element L58 and the image-side surface S516 can be enhanced, and the total length and the angle of view of the wide-angle lens 5 can be effectively balanced. If the following conditions are satisfied: TTL/R is more than 1.311< 2.6 and 0.03 < | f12/f34< 1.7. Therefore, the combination and the arrangement of the center stop can enhance the negative refractive power of the object-side surface S51, the image-side surface S52 and the second lens element L52 of the first lens element L51 and the shape arrangement of the object-side surface S53 and the image-side surface S54, thereby enhancing the miniaturization of the wide-angle lens 5 and effectively controlling the size of the angle of view of the lens, and helping the wide-angle lens to balance the size of the stop, the angle of view and the total length. If the following conditions are satisfied: 64.3>Vd1>30 and 54.5>Vd2>35. Thereby, the first stage can be strengthenedThe lens L51 and the second lens L52 have achromatic functions.
Table nine is a table of correlation parameters of the respective lenses of the wide-angle lens 5 in fig. 9.
Watch nine
Table ten shows the relevant parameter values of the wide-angle lens 5 of the fifth embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table ten that the wide-angle lens 5 of the fifth embodiment can satisfy the requirements of the conditions (1) to (5).
Watch ten
| f12 | -18.568mm | f34 | -527.76mm | ||
| TTL/f | 8.531 | TTL/R11 | 1.633 | |f12/f34| | 0.035 |
| Vd1 | 55.2 | Vd2 | 40.9 |
In addition, the optical performance of the wide-angle lens 5 of the fifth embodiment can also meet the requirement, and as can be seen from fig. 10A, the field curvature of the wide-angle lens 5 of the fifth embodiment is between-0.02 mm and 0.03 mm. As can be seen from fig. 10B, the wide-angle lens 5 of the fifth embodiment has a distortion of-8% to 0%. As can be seen from fig. 10C, the lateral chromatic aberration of the wide-angle lens 5 of the fifth embodiment is between-0.3 μm and 1.6 μm. As shown in fig. 10D, the relative illumination of the wide-angle lens 5 of the fifth embodiment is between 0.69 and 1.0. As can be seen from fig. 10E, the wide-angle lens 5 of the fifth embodiment has a light spot with a root mean square radius of 0.787 μm and a geometric radius of 3.168 μm when the image height is 0.000mm, a light spot with a root mean square radius of 1.114 μm and a geometric radius of 6.010 μm when the image height is 2.750mm, and a light spot with a root mean square radius of 2.082 μm and a geometric radius of 9.702 μm when the image height is 3.928 mm. As can be seen from fig. 10F, the wide-angle lens 5 of the fifth embodiment has a modulation transfer function value between 0.59 and 1.0. As can be seen from fig. 10G, the wide-angle lens 5 of the fifth embodiment has a modulation transfer function value between 0.0 and 0.72 when the focus offset is between-0.05 mm and 0.05 mm.
It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 5 of the fifth embodiment can be effectively corrected, and the relative illumination, the lens resolution and the focal depth can also meet the requirements, so that better optical performance can be obtained.
Referring to fig. 11, fig. 11 is a schematic lens configuration diagram of a wide-angle lens according to a sixth embodiment of the invention. The wide-angle lens 6 includes, in order from an object side to an image side along an optical axis OA6, a first lens element L61, a second lens element L62, a third lens element L63, a fourth lens element L64, a fifth lens element L65, an aperture ST6, a sixth lens element L66, a seventh lens element L67, an eighth lens element L68, and a protective glass CG 6. In imaging, light from the object side is finally imaged on the imaging surface IMA 6. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L61 has positive refractive power;
the third lens element L63 is a biconcave lens element with negative refractive power, and has a concave object-side surface S65, a concave image-side surface S66, and spherical object-side and image-side surfaces S65 and S66, respectively;
the fourth lens element L64 is a biconvex lens element, in which the object-side surface S67 is convex, the image-side surface S68 is convex, and both the object-side surface S67 and the image-side surface S68 are spherical surfaces;
the fifth lens element L65 is a meniscus lens element with a concave image-side surface S610;
the seventh lens element L67 is a biconcave lens element, and its image-side surface S614 is concave;
the eighth lens element L68 is a biconvex lens element, in which the object-side surface S615 is a convex surface, and both the object-side surface S615 and the image-side surface S616 are aspheric surfaces;
the object side surface S617 and the image side surface S618 of the protective glass CG6 are both planar;
by using the design of the lens, the aperture ST6 and at least one of the conditions (1) to (5), the wide-angle lens 6 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist the environmental temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
If condition (5) Vd2If the numerical value of (2) is less than 35, the achromatic function is not good. Thus, Vd2Must be at least greater than 35, so that the optimum effect range is 54.5>Vd2>35, if the range is satisfied, the optimum achromatization condition is satisfied.
Table eleven is a table of the correlation parameters of the respective lenses of the wide-angle lens 6 in fig. 11.
Watch eleven
The aspherical surface concavity z of the aspherical lens in table eleven is obtained by the following formula:
z＝ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8
wherein:
c: a curvature;
h: the vertical distance from any point on the surface of the lens to the optical axis;
k: a cone coefficient;
a to C: an aspheric surface coefficient.
TABLE twelve is a table of relevant parameters for the aspheric surfaces of the aspheric lens elements of TABLE eleven, where k is the Conic coefficient (Conic Constant) and A-C are aspheric coefficients.
Watch twelve
Table thirteen shows the relevant parameter values of the wide-angle lens 6 of the sixth embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table thirteen that the wide-angle lens 6 of the sixth embodiment can satisfy the requirements of the conditions (1) to (5).
Watch thirteen
| f12 | -24.246mm | f34 | -31.159mm | ||
| TTL/f | 9.452 | TTL/R11 | 1.765 | |f12/f34| | 0.778 |
| Vd1 | 62.9 | Vd2 | 53.8 |
In addition, the optical performance of the wide-angle lens 6 of the sixth embodiment can also meet the requirement, and as can be seen from fig. 12A, the field curvature of the wide-angle lens 6 of the sixth embodiment is between-0.02 mm and 0.035 mm. As can be seen from fig. 12B, the wide-angle lens 6 of the sixth embodiment has a distortion of-8% to 0%. As can be seen from fig. 12C, the lateral chromatic aberration of the wide-angle lens 6 of the sixth embodiment is between-0.5 μm and 1.4 μm. As shown in fig. 12D, the relative illumination of the wide-angle lens 6 of the sixth embodiment is between 0.60 and 1.0. As can be seen from fig. 12E, the wide-angle lens 6 of the sixth embodiment has a light spot with a root mean square radius of 1.052 μm and a geometric radius of 3.992 μm when the image height is 0.000mm, a light spot with a root mean square radius of 1.153 μm and a geometric radius of 6.678 μm when the image height is 2.750mm, and a light spot with a root mean square radius of 1.821 μm and a geometric radius of 10.259 μm when the image height is 3.923 mm. As shown in fig. 12F, the modulation transfer function value of the wide-angle lens 6 of the sixth embodiment is between 0.56 and 1.0. As can be seen from fig. 12G, the wide-angle lens 6 of the sixth embodiment has a modulation transfer function value between 0.0 and 0.72 when the focus offset is between-0.05 mm and 0.05 mm.
It is obvious that the field curvature, distortion and lateral chromatic aberration of the wide-angle lens 6 of the sixth embodiment can be effectively corrected, and the relative illuminance, the lens resolution and the focal depth can also meet the requirements, so that better optical performance can be obtained.
Referring to fig. 13, fig. 13 is a schematic lens configuration diagram of a wide-angle lens according to a seventh embodiment of the invention. The wide-angle lens 7 includes, in order from an object side to an image side along an optical axis OA7, a first lens L71, a second lens L72, a third lens L73, a fourth lens L74, an aperture ST7, a fifth lens L75, a sixth lens L76, a seventh lens L77, an eighth lens L78, a ninth lens L79, a filter OF7, and a protective glass CG 7. In imaging, light from the object side is finally imaged on the imaging surface IMA 7. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L71 has negative refractive power;
the third lens element L73 is a meniscus lens element with positive refractive power, and has a concave object-side surface S75, a convex image-side surface S76, and aspheric object-side surfaces S75 and S76;
the fourth lens element L74 is a meniscus lens element with a convex object-side surface S77, a concave image-side surface S78, and aspheric surfaces on both the object-side surface S77 and the image-side surface S78;
the fifth lens element L75 is a biconvex lens element, and its image-side surface S711 is a convex surface;
the seventh lens element L77 is a biconcave lens element, and its image-side surface S714 is a concave surface;
the eighth lens element L78 is a meniscus lens element with a concave object-side surface S715 and both object-side surface S715 and image-side surface S716 being aspheric surfaces;
the ninth lens element L79 is a meniscus lens element with negative refractive power and made of glass material, wherein the object-side surface S717 is concave, the image-side surface S718 is convex, and the object-side surface S717 and the image-side surface S718 are both spherical surfaces;
the object-side surface S719 and the image-side surface S720 OF the filter OF7 are both planar;
the object side surface S721 and the image side surface S722 of the protective glass CG7 are both planar;
by using the design of the lens, the aperture ST7 and at least one of the conditions (1) to (5), the wide-angle lens 7 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist the environmental temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
Table fourteen is a table of correlation parameters of each lens of the wide-angle lens 7 in fig. 13.
Table fourteen
The aspherical surface concavity z of the aspherical lens in table fourteen is as defined in the sixth embodiment. Table fifteen is a table of relevant parameters of the aspheric surface of the aspheric lens in table fourteen, and the definition of the relevant coefficients is the same as that of the sixth embodiment, which is not repeated herein.
Fifteen items of table
Table sixteenth shows the related parameter values of the wide-angle lens 7 of the seventh embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table sixteenth that the wide-angle lens 7 of the seventh embodiment can satisfy the requirements of the conditions (1) to (5).
Watch sixteen
| f12 | -6.99mm | f34 | 13.28mm | ||
| TTL/f | 7.547 | TTL/R11 | 1.504 | |f12/f34| | 0.526 |
| Vd1 | 35.3 | Vd2 | 40.8 |
In addition, the optical performance of the wide-angle lens 7 of the seventh embodiment can also meet the requirement, and as can be seen from fig. 14A, the longitudinal aberration of the wide-angle lens 7 of the seventh embodiment is between-0.015 mm and 0.03 mm. As can be seen from fig. 14B, the field curvature of the wide-angle lens 7 of the seventh embodiment is between-0.04 mm and 0.06 mm. As can be seen from fig. 14C, the wide-angle lens 7 of the seventh embodiment has a distortion of-80% to 0%. As can be seen from fig. 14D, the wide-angle lens 7 of the seventh embodiment has a lateral chromatic aberration between 0 μm and 4.0 μm. As shown in fig. 14E, the modulation transfer function value of the wide-angle lens 7 of the seventh embodiment is between 0.48 and 1.0.
It is obvious that the longitudinal aberration, curvature of field, distortion and lateral chromatic aberration of the wide-angle lens 7 of the seventh embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.
Referring to fig. 15, fig. 15 is a schematic lens configuration diagram of an eighth embodiment of a wide-angle lens according to the invention. The wide-angle lens 8 includes, in order from an object side to an image side along an optical axis OA8, a first lens L81, a second lens L82, a third lens L83, a fourth lens L84, an aperture ST8, a fifth lens L85, a sixth lens L86, a seventh lens L87, an eighth lens L88, a ninth lens L89, a filter OF8, and a protective glass CG 8. In imaging, light from the object side is finally imaged on the imaging surface IMA 8. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L81 has negative refractive power;
the third lens element L83 is a meniscus lens element with positive refractive power, and has a concave object-side surface S85, a convex image-side surface S86, and aspheric object-side surfaces S85 and S86;
the fourth lens element L84 is a meniscus lens element with a convex object-side surface S87, a concave image-side surface S88, and aspheric surfaces on both the object-side surface S87 and the image-side surface S88;
the fifth lens element L85 is a biconvex lens element, and its image-side surface S811 is a convex surface;
the seventh lens element L87 is a meniscus lens element with the image-side surface S814 being convex;
the eighth lens element L88 is a meniscus lens element with a concave object-side surface S815 and aspheric object-side surfaces S815 and S816;
the ninth lens element L89 is a meniscus lens element with negative refractive power and made of glass material, wherein the object-side surface S817 is concave, the image-side surface S818 is convex, and both the object-side surface S817 and the image-side surface S818 are spherical surfaces;
the filter OF8 has an object-side surface S819 and an image-side surface S820 that are both planar;
the object side surface S821 and the image side surface S822 of the protective glass CG8 are both planar;
by using the design of the lens, the aperture ST8 and at least one of the conditions (1) to (5), the wide-angle lens 8 can effectively reduce the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist the environmental temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
Table seventeenth is a table of relevant parameters of each lens of the wide-angle lens 8 in fig. 15.
Seventeen table
The aspherical surface concavity z of the aspherical lens in seventeenth embodiment is as defined in the sixth embodiment. Table eighteen is a table of related parameters of the aspheric surface of the aspheric lens in table seventeen, and the related coefficients are defined as the same as those in the sixth embodiment, which is not repeated herein.
Watch eighteen
Table nineteen shows the relevant parameter values of the wide-angle lens 8 of the eighth embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table nineteen that the wide-angle lens 8 of the eighth embodiment can satisfy the requirements of the conditions (1) to (5).
Table nineteen
| f12 | -7.06mm | f34 | 18.22mm | ||
| TTL/f | 7.551 | TTL/R11 | 1.560 | |f12/f34| | 0.387 |
| Vd1 | 35.3 | Vd2 | 40.8 |
In addition, the optical performance of the wide-angle lens 8 of the eighth embodiment can also meet the requirement, and as can be seen from fig. 16A, the longitudinal aberration of the wide-angle lens 8 of the eighth embodiment is between-0.01 mm and 0.025 mm. As can be seen from fig. 16B, the field curvature of the wide-angle lens 8 of the eighth embodiment is between-0.04 mm and 0.06 mm. As can be seen from fig. 16C, the distortion of the wide-angle lens 8 of the eighth embodiment is between-80% and 0%. As can be seen from fig. 16D, the wide-angle lens 8 of the eighth embodiment has a lateral chromatic aberration between 0 μm and 3.5 μm. As can be seen from fig. 16E, the wide-angle lens 8 of the eighth embodiment has a modulation transfer function value between 0.49 and 1.0.
It is obvious that the longitudinal aberration, curvature of field, distortion and lateral chromatic aberration of the wide-angle lens 8 of the eighth embodiment can be effectively corrected, and the resolution of the lens can meet the requirements, thereby obtaining better optical performance.
Referring to fig. 17, fig. 17 is a schematic lens configuration diagram of a ninth embodiment of a wide-angle lens according to the invention. The wide-angle lens 9 includes, in order from an object side to an image side along an optical axis OA9, a first lens L91, a second lens L92, a third lens L93, a fourth lens L94, an aperture ST9, a fifth lens L95, a sixth lens L96, a seventh lens L97, an eighth lens L98, a ninth lens L99, a filter OF9, and a protective glass CG 9. In imaging, light from the object side is finally imaged on the imaging surface IMA 9. According to [ embodiments ] the first to eleventh paragraphs, wherein:
the first lens L91 has negative refractive power;
the third lens element L93 is a meniscus lens element with positive refractive power, and has a concave object-side surface S95, a convex image-side surface S96, and aspheric object-side surfaces S95 and S96;
the fourth lens element L94 is a meniscus lens element with a convex object-side surface S97, a concave image-side surface S98, and aspheric surfaces on both the object-side surface S97 and the image-side surface S98;
the fifth lens element L95 is a biconvex lens element, and its image-side surface S911 is a convex surface;
the seventh lens element L97 is a meniscus lens element with the image-side surface S914 being convex;
the eighth lens element L98 is a meniscus lens element with a concave object-side surface S915, and both object-side surface S915 and image-side surface S916 being aspheric surfaces;
the ninth lens element L99 is a meniscus lens element with negative refractive power and made of glass, wherein the object-side surface S917 is concave, the image-side surface S918 is convex, and the object-side surface S917 and the image-side surface S918 are both spherical surfaces;
the filter OF9 has an object-side surface S919 and an image-side surface S920 both being planar;
the object side surface S921 and the image side surface S922 of the cover glass CG9 are both planar;
by using the design of the lens, the stop ST9 and at least one of the conditions (1) to (5), the wide-angle lens 9 can effectively reduce the total length of the lens, effectively reduce the stop value, effectively improve the resolution, effectively resist the ambient temperature variation, effectively correct the aberration, and effectively correct the chromatic aberration.
Table twenty is a table of relevant parameters of each lens of the wide-angle lens 9 in fig. 17.
Watch twenty
The aspherical surface concavity z of the aspherical lens in table twenty is defined as in the sixth embodiment. Table twenty-one is a table of relevant parameters of the aspheric surface of the aspheric lens in table twenty, and the definition of the relevant coefficients is the same as that in the sixth embodiment, which is not repeated herein.
TABLE twenty one
Twenty-two are the related parameter values of the wide-angle lens 9 of the ninth embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from the table twenty-two that the wide-angle lens 9 of the ninth embodiment can satisfy the requirements of the conditions (1) to (5).
Watch twenty two
| f12 | -6.12mm | f34 | 12.27mm | ||
| TTL/f | 5.851 | TTL/R11 | 1.468 | |f12/f34| | 0.498 |
| Vd1 | 35.3 | Vd2 | 40.8 |
In addition, the optical performance of the wide-angle lens 9 of the ninth embodiment can also meet the requirement, and as can be seen from fig. 18A, the longitudinal aberration of the wide-angle lens 9 of the ninth embodiment is between-0.01 mm and 0.03 mm. As can be seen from fig. 18B, the field curvature of the wide-angle lens 9 of the ninth embodiment is between-0.04 mm and 0.13 mm. As can be seen from fig. 18C, the distortion of the wide-angle lens 9 of the ninth embodiment is between-80% and 0%. As can be seen from fig. 18D, the wide-angle lens 9 of the ninth embodiment has a lateral chromatic aberration between 0.5 μm and 4.0 μm. As can be seen from fig. 18E, the modulation transfer function value of the wide-angle lens 9 of the ninth embodiment is between 0.40 and 1.0.
It is obvious that the longitudinal aberration, curvature of field, distortion and lateral chromatic aberration of the wide-angle lens 9 of the ninth embodiment can be effectively corrected, and the resolution of the lens can meet the requirements, so as to obtain better optical performance.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A wide-angle lens, comprising:
the first lens has refractive power and comprises a convex surface facing the object side;
the second lens has refractive power, and comprises a convex surface facing the object side and a concave surface facing the image side;
the third lens has refractive power;
the fourth lens has positive refractive power;
the fifth lens has refractive power and comprises a convex surface facing the object side;
the sixth lens has positive refractive power;
the seventh lens has refractive power, and the seventh lens comprises a concave surface facing the object side; and
the eighth lens has refractive power;
the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element and the eighth lens element are sequentially disposed along an optical axis from an object side to an image side, and relative positions of the lens elements are fixed.
2. The wide-angle lens of claim 1, wherein the sixth lens is cemented with the seventh lens.
3. The wide-angle lens of claim 2, further comprising a ninth lens element disposed between the seventh lens element and the image side, the ninth lens element having negative refractive power and comprising a concave surface facing the object side.
4. The wide-angle lens of claim 3, wherein the eighth lens is cemented with the ninth lens.
5. The wide-angle lens of claim 3, further comprising a tenth lens element disposed between the seventh lens element and the image side, the tenth lens element having positive refractive power and comprising a convex surface facing the object side and another convex surface facing the image side.
6. The wide-angle lens of claim 1,
the first lens has positive refractive power;
the third lens element with negative refractive power comprises a concave surface facing the image side;
the fourth lens element includes a convex surface facing the image side; and
the eighth lens element includes a convex surface facing the object side.
7. The wide-angle lens of claim 1,
the first lens has negative refractive power;
the third lens has positive refractive power;
at least one object side surface of the third lens element and the eighth lens element is a concave surface;
at least one image side surface of the third lens element and the fifth lens element is a convex surface; and
the fourth lens element includes a convex surface facing the object side and a concave surface facing the image side.
8. The wide-angle lens of claim 1,
the first lens element further comprises a concave surface facing the image side; and
the sixth lens element includes a convex surface facing the object side and another convex surface facing the image side.
9. The wide-angle lens of claim 1,
at least one of the second lens and the seventh lens has negative refractive power;
at least one of the fifth lens element and the eighth lens element has a positive refractive power.
10. The wide-angle lens of any one of claims 1 to 7, wherein the wide-angle lens satisfies the following condition:
5.5＜TTL/f＜10；
1.3＜TTL/R11＜2.6；
0.03＜|f12/f34|＜1.7；
64.3>Vd1>30；
54.5>Vd2>35；
wherein f is the effective focal length of the wide-angle lens, f12Is the combined effective focal length of the first lens and the second lens, f34Is the combined effective focal length, R, of the third lens and the fourth lens11Is the curvature radius of the object side surface of the first lens element, TTL is the distance between the object side surface of the first lens element and the image plane on the optical axis, Vd1Is Abbe number, Vd, of the first lens2Is the abbe number of the second lens.
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| CN201911250161.5A CN113031202B (en) | 2019-12-09 | 2019-12-09 | Wide-angle lens |
| US17/114,778 US20210173180A1 (en) | 2019-12-09 | 2020-12-08 | Wide-Angle Lens Assembly |
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| CN201911250161.5A CN113031202B (en) | 2019-12-09 | 2019-12-09 | Wide-angle lens |
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| CN117270167A (en) * | 2023-11-23 | 2023-12-22 | 江西联益光学有限公司 | Optical lens |
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| US20170307858A1 (en) * | 2016-04-20 | 2017-10-26 | Ability Enterprise Co., Ltd. | Optical lens |
| JP2018081240A (en) * | 2016-11-17 | 2018-05-24 | コニカミノルタ株式会社 | Imaging optical system and imaging apparatus |
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| CN117270167B (en) * | 2023-11-23 | 2024-02-20 | 江西联益光学有限公司 | Optical lens |
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