CN112462485B - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN112462485B CN112462485B CN201910842019.3A CN201910842019A CN112462485B CN 112462485 B CN112462485 B CN 112462485B CN 201910842019 A CN201910842019 A CN 201910842019A CN 112462485 B CN112462485 B CN 112462485B
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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Abstract
An imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens. The first lens has negative refractive power and comprises a concave surface facing the image side. The second lens has a negative refractive power. The third lens has a positive refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has a negative refractive power. The seventh lens has refractive power. The eighth lens has refractive power. The ninth lens element is a meniscus lens element and has a convex surface facing the object side and a concave surface facing the image side. The first, second, third, fourth, fifth, sixth, seventh, eighth and ninth lenses are arranged in order from an object side to an image side along an optical axis.
Description
Technical Field
The invention relates to an imaging lens.
Background
The development trend of the existing imaging lens is not only continuously developing towards a large aperture and a high resolution, but also needs to have the capability of resisting the change of the ambient temperature along with different application requirements, the existing imaging lens cannot meet the existing requirements, and another imaging lens with a new structure is needed to meet the requirements of the large aperture, the high resolution and the resistance to the change of the ambient temperature.
Disclosure of Invention
The invention aims to solve the technical problem that an imaging lens in the prior art cannot meet the requirements of large aperture, high resolution and environmental temperature change resistance at the same time, and provides the imaging lens which is small in aperture value, high in resolution, resistant to environmental temperature change and still has good optical performance.
The present invention provides an imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. The first lens has negative refractive power and comprises a concave surface facing the image side. The second lens has a negative refractive power. The third lens has a positive refractive power. The fourth lens has positive refractive power. The fifth lens has a positive refractive power. The sixth lens has negative refractive power. The seventh lens has a refractive power. The eighth lens has refractive power. The ninth lens element is a meniscus lens element and has a convex surface facing the object side and a concave 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, the eighth lens element and the ninth lens element are sequentially disposed from an object side to an image side along an optical axis.
The third lens element has a convex surface facing the image side, and the sixth lens element has a concave surface facing the object side.
The first lens element can further include a concave surface facing the object side, the second lens element can include a concave surface facing the object side, and the fourth lens element can be a meniscus lens element.
The second lens element includes a convex surface facing the object side, the third lens element includes a convex surface facing the object side, the fourth lens element includes a convex surface facing the object side and a concave surface facing the image side, the fifth lens element includes a convex surface facing the object side and another convex surface facing the image side, the sixth lens element includes a concave surface facing the image side, the seventh lens element has a positive refractive power, the seventh lens element includes a convex surface facing the object side and another convex surface facing the image side, the eighth lens element has a positive refractive power, the eighth lens element includes a convex surface facing the object side and another convex surface facing the image side, the ninth lens element is a meniscus lens element having a negative refractive power, and the ninth lens element includes a convex surface facing the object side and a concave surface facing the image side.
The second lens element is a meniscus lens element, the fourth lens element is a meniscus lens element, the seventh lens element has a positive refractive power, the seventh lens element includes a convex surface facing the object side and another convex surface facing the image side, the eighth lens element has a negative refractive power, the eighth lens element includes a convex surface facing the object side and a concave surface facing the image side, the ninth lens element has a positive refractive power, and the ninth lens element includes a convex surface facing the object side and a concave surface facing the image side.
The seventh lens element includes a concave surface facing the image side, the eighth lens element has a positive refractive power, the eighth lens element includes a convex surface facing the object side and another convex surface facing the image side, the ninth lens element is a meniscus lens element having a positive refractive power, the ninth lens element includes a convex surface facing the object side and a concave surface facing the image side, the imaging lens assembly further includes a tenth lens element disposed between the sixth lens element and the seventh lens element, the tenth lens element has a negative refractive power, and the tenth lens element includes a convex surface facing the object side and a concave surface facing the image side.
The imaging lens meets the following conditions: 1 < f 1234 /f＜2.1；-1.2＜f 7 /f 8 Less than 0.7; wherein f is the effective focal length of the imaging lens, f 1234 Is the combined effective focal length of the first lens, the second lens, the third lens and the fourth lens, f 7 Is the effective focal length of the seventh lens, f 8 Is the effective focal length of the eighth lens.
Wherein the fifth lens is cemented with the sixth lens or the seventh lens is cemented with the eighth lens.
The imaging lens meets the following conditions: f/TTL is more than 0.2 and less than 0.35; t is more than 7.5 9 /T 1 < 14; A/IH is more than 1.3 and less than 2.1; wherein f is the effective focal length of the imaging lens, TTL is the distance between the object side surface of the first lens element and the imaging surface on the optical axis, and T 1 Is the thickness of the first lens on the optical axis, T 9 The thickness of the ninth lens element on the optical axis, A is the diameter of the aperture stop, and IH is the maximum image height of the imaging lens.
Conditions are as follows: f/TTL is more than 0.2 and less than 0.35, and the imaging lens can be miniaturized. Conditions are as follows: 1 < f 1234 The/f is less than 2.1, the refractive power distribution of the front section lens of the imaging lens can be balanced, so that the field size of the imaging lens is effectively controlled, and the resolution is obviously improved. Conditions are as follows: -1.2 < f 7 /f 8 Less than 0.7, the function of correcting aberration can be improved.
The imaging lens has the following beneficial effects: the aperture value is small, the resolution is high, the environment temperature change is resisted, and the optical performance is still good.
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 schematic lens arrangement diagram of a first embodiment of an imaging lens according to the present invention.
Fig. 2A is a Field Curvature (Field Curvature) diagram of the first embodiment of the imaging lens according to the present invention.
Fig. 2B is a Distortion (Distortion) diagram of the first embodiment of the imaging lens according to the present invention.
Fig. 2C is a Lateral chromatic aberration (lareal Color) diagram of the first embodiment of the imaging lens according to the present invention.
Fig. 3 is a lens arrangement diagram of a second embodiment of an imaging lens according to the present invention.
Fig. 4A is a curvature of field diagram of a second embodiment of an imaging lens according to the present invention.
Fig. 4B is a distortion diagram of the second embodiment of the imaging lens according to the present invention.
Fig. 4C is a lateral chromatic aberration diagram of the second embodiment of the imaging lens according to the present invention.
Fig. 5 is a lens arrangement diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6A is a field curvature diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6B is a distortion diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6C is a lateral chromatic aberration diagram of a third embodiment of an imaging lens according to the present invention.
Detailed Description
The present invention provides an imaging lens, including: the first lens has negative refractive power and comprises a concave surface facing the image side; the second lens has negative refractive power; the third lens has positive refractive power; the fourth lens has positive refractive power; the fifth lens has positive refractive power; the sixth lens has negative refractive power; the seventh lens has refractive power; the eighth lens has refractive power; the ninth lens element is a meniscus lens element, which has a convex surface facing the object side and a concave 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, the eighth lens element and the ninth lens element are sequentially arranged along an optical axis from an object side to an image side.
Please refer to the following tables i, iii, iv, sixty and seventy, wherein tables i, iii and sixty are the related parameter tables of the lenses of the first to third embodiments of the imaging lens according to the present invention, respectively, and tables iv and seventy are the related parameter tables of the aspheric surfaces of the aspheric lenses of tables iii and sixty, respectively.
Fig. 1, 3 and 5 are schematic lens configurations of the first, second and third embodiments of the imaging lens of the present invention, respectively, wherein the first lenses L11, L21 and L31 are biconcave lenses with negative refractive power and made of glass material, the object side surfaces S11, S21 and S31 are concave surfaces, the image side surfaces S12, S22 and S32 are concave surfaces, and the object side surfaces S11, S21 and S31 and the image side surfaces S12, S22 and S32 are spherical surfaces.
The second lenses L12, L22, and L32 are meniscus lenses with negative refractive power, made of glass, and have concave object-side surfaces S13, S23, and S33, convex image-side surfaces S14, S24, and S34, and spherical surfaces on the object-side surfaces S13, S23, S33 and the image-side surfaces S14, S24, and S34.
The third lenses L13, L23 and L33 are biconvex lenses with positive refractive power, made of glass, and have convex object-side surfaces S15, S25 and S35, convex image-side surfaces S16, S26 and S36, and spherical surfaces on the object-side surfaces S15, S25 and S35 and the image-side surfaces S16, S26 and S36.
The fourth lenses L14, L24, and L34 are meniscus lenses with positive refractive power, and are made of glass, and the object-side surfaces S17, S27, and S37 are convex surfaces, the image-side surfaces S18, S28, and S38 are concave surfaces, and the object-side surfaces S17, S27, and S37 and the image-side surfaces S18, S28, and S38 are all spherical surfaces.
The fifth lenses L15, L25, and L35 are biconvex lenses with positive refractive power, and are made of glass material, and the object side surfaces S110, S210, and S310 are convex surfaces, the image side surfaces S111, S211, and S311 are convex surfaces, and the object side surfaces S110, S210, and S310 and the image side surfaces S111, S211, and S311 are spherical surfaces.
The sixth lenses L16, L26, and L36 are biconcave lenses with negative refractive power, and are made of glass materials, wherein the object-side surfaces S111, S211, and S311 are concave surfaces, the image-side surfaces S112, S212, and S312 are concave surfaces, and the object-side surfaces S111, S211, and S311 and the image-side surfaces S112, S212, and S312 are spherical surfaces.
The seventh lenses L17, L27, and L37 have positive refractive power, are made of glass material, and have convex object-side surfaces S113, S213, and S314, and spherical object-side surfaces S113, S213, and S314 and image-side surfaces S114, S214, and S315.
The eighth lenses L18, L28, and L38 are made of glass material, and the object-side surfaces S115, S215, and S316 are convex surfaces, and the object-side surfaces S115, S215, and S316 and the image-side surfaces S116, S216, and S317 are spherical surfaces.
The ninth lenses L19, L29, and L39 are made of glass, and have convex object-side surfaces S117, S217, and S318 and concave image-side surfaces S118, S218, and S319.
The fifth lenses L15, L25, and L35 are cemented to the sixth lenses L16, L26, and L36, respectively.
In addition, the imaging lenses 1, 2, 3 at least satisfy one of the following conditions:
0.2＜f/TTL＜0.35 (1)
7.5＜T 9 /T 1 ＜14 (2)
1＜f 1234 /f＜2.1 (3)
-1.2＜f 7 /f 8 ＜0.7 (4)
1.3＜A/IH＜2.1 (5)
wherein f is the effective focal length of the imaging lenses 1, 2, 3 in the first to third embodiments, f 7 Effective focal length f of the seventh lenses L17, L27, L37 in the first to third embodiments 8 Effective focal length, f, of the eighth lenses L18, L28, L38 in the first to third embodiments 1234 In the first to third embodiments, the first lenses L11, L21, L31, the second lenses L12, L22, L32, the third lenses L13, L23, L33 and the fourth lenses L14, L24 and L34 have combined effective focal lengths, TTL is the distance between the object side surfaces S11, S21 and S31 of the first lenses L11, L21 and L31 to the imaging surfaces S1, IMA2 and IMA3 on the optical axes OA1, OA2 and OA3 respectively, and T2 is the distance between the imaging surfaces S1, IMA2 and IMA3 on the optical axes OA1, OA2 and OA3 respectively 1 The thicknesses, T, of the first lenses L11, L21, L31 on the optical axes OA1, OA2, OA3 in the first to third embodiments 9 Is the first instanceIn the embodiments to the third embodiment, the thicknesses of the ninth lenses L19, L29, and L39 on the optical axes OA1, OA2, OA3 are shown, a is the diameters of the apertures ST1, ST2, and ST3 in the embodiments to the third embodiment, and IH is the maximum image height of the imaging lenses 1, 2, and 3 in the embodiments to the third embodiment. Therefore, the imaging lenses 1, 2 and 3 can effectively reduce the aperture value, effectively improve the resolution and effectively resist the environmental temperature change.
A first embodiment of the imaging lens of the present invention will now be described in detail. Referring to fig. 1, the imaging 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, an aperture stop ST1, a fifth lens element L15, 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 twelfth paragraphs, wherein:
the seventh lens element L17 is a biconvex lens, and its image-side surface S114 is a convex surface;
the eighth lens element L18 is a biconvex lens with positive refractive power, and has a convex image-side surface S116;
the ninth lens element L19 has negative refractive power, and has an object-side surface S117 and an image-side surface S118 both being spherical surfaces;
the optical filter OF1 has an object-side surface S119 and an image-side surface S120 both being flat;
the object-side surface S121 and the image-side surface S122 of the cover glass CG1 are both planar.
By using the design that the lens, the aperture ST1 at least satisfy one of the conditions (1) to (5), the imaging lens 1 can effectively reduce the aperture value, effectively improve the resolution, and effectively resist the environmental temperature variation.
If the value of f/TTL is less than 0.2 under condition (1), it is difficult to achieve the purpose of downsizing the imaging lens. Therefore, the value of f/TTL must be at least greater than 0.2, so the optimum effect range is 0.2 < f/TTL < 0.35, and the optimum imaging lens miniaturization condition is satisfied in the range.
The first table is a table of relevant parameters of each lens of the imaging lens 1 in fig. 1.
Watch 1
The second table shows the related parameter values of the imaging lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from the second table that the imaging lens 1 of the first embodiment can satisfy the requirements of the conditions (1) to (5).
In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet requirements, as can be seen from fig. 2A to 2C. Fig. 2A is a view showing a curvature of field of the imaging lens 1 of the first embodiment. Fig. 2B is a distortion diagram of the imaging lens 1 of the first embodiment. Fig. 2C is a lateral chromatic aberration diagram of the imaging lens 1 of the first embodiment.
As can be seen from fig. 2A, the curvature of field of the imaging lens 1 of the first embodiment is between-0.015 mm and 0.02 mm.
As can be seen from fig. 2B, the distortion of the imaging lens 1 of the first embodiment is between-9% and 0%.
As can be seen from fig. 2C, the imaging lens 1 of the first embodiment has a lateral chromatic aberration between-0.1 μm and 1.5 μm.
It is apparent that the field curvature, distortion, and lateral chromatic aberration of the imaging lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.
Referring to fig. 3, fig. 3 is a schematic lens configuration diagram of an imaging lens system according to a second embodiment of the invention. The imaging lens 2 includes, in order from an object side to an image side along an optical axis OA2, a first lens element L21, a second lens element L22, a third lens element L23, a fourth lens element L24, an aperture ST2, a fifth lens element L25, a sixth lens element L26, a seventh lens element L27, an eighth lens element L28, a ninth lens element L29, a filter OF2, and a protective glass CG 2. In imaging, light from the object side is finally imaged on an imaging surface IMA 2. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the seventh lens element L27 is a biconvex lens element, and its image-side surface S214 is convex;
the eighth lens L28 is a meniscus lens having a negative refractive power, and its image-side surface S216 is a concave surface;
the ninth lens element L29 has positive refractive power, and has an object-side surface S217 and an image-side surface S218 both being aspheric surfaces;
the optical filter OF2 has an object-side surface S219 and an image-side surface S220 both being planar;
the object-side surface S221 and the image-side surface S222 of the cover glass CG2 are both planar.
By using the design of the lens, the aperture ST2 and at least one of the conditions (1) to (5), the imaging lens 2 can effectively reduce the aperture value, effectively improve the resolution and effectively resist the environmental temperature change.
Wherein if the condition (3) f 1234 If the value of/f is less than 1, the performance of the imaging lens is poor and the resolution is low. Thus, f 1234 The value of/f must be at least greater than 1, so that the optimum effect range is 1 < f 1234 The/f is less than 2.1, and the performance and the resolution of the imaging lens can be improved according with the range.
Table three is a table of the relevant parameters of each lens of the imaging lens 2 in fig. 3.
Watch III
The aspherical surface sag z of the aspherical lens in table three is obtained by the following equation:
z＝ch 2 /{1+[1-(k+1)c 2 h 2 ] 1/2 }+Ah 4 +Bh 6 +Ch 8 +Dh 10
wherein:
c: a curvature;
h: the vertical distance from any point on the surface of the lens to the optical axis;
k: the cone coefficient;
a to D: and (4) aspheric surface coefficients.
The fourth table is a table of the relevant parameters of the aspheric surface of the aspheric lens in the third table, where k is the Conic coefficient (Conic Constant) and A-D are aspheric coefficients.
Watch four
Table five shows the related parameter values of the imaging lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table five that the imaging lens 2 of the second embodiment can satisfy the requirements of the conditions (1) to (5).
Watch five
In addition, the optical performance of the imaging lens 2 of the second embodiment can also be satisfied, as can be seen from fig. 4A to 4C. Fig. 4A is a view showing a curvature of field of the imaging lens 2 of the second embodiment. Fig. 4B is a distortion diagram of the imaging lens 2 of the second embodiment. Fig. 4C is a lateral chromatic aberration diagram of the imaging lens 2 of the second embodiment.
As can be seen from fig. 4A, the curvature of field of the imaging lens 2 of the second embodiment is between-0.01 mm and 0.03 mm.
As can be seen from fig. 4B, the distortion of the imaging lens 2 of the second embodiment is between-9% and 0%.
As can be seen from fig. 4C, the lateral chromatic aberration of the imaging lens 2 of the second embodiment is between-0.5 μm and 1.1 μm.
It is apparent that the field curvature, distortion, and lateral chromatic aberration of the imaging lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.
Referring to fig. 5, fig. 5 is a lens configuration diagram of an imaging lens system according to a third embodiment of the invention. The imaging lens 3 includes, in order from an object side to an image side along an optical axis OA3, a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, an aperture ST3, a fifth lens L35, a sixth lens L36, a tenth lens L310, 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 twelfth paragraphs, wherein:
the tenth lens element L310 is a meniscus lens element with negative refractive power, and has a convex object-side surface S313, a concave image-side surface S314, and spherical object-side surfaces S313 and S314;
the seventh lens element L37 is a meniscus lens element with a concave image-side surface S315;
the tenth lens L310 is cemented to the seventh lens L37;
the eighth lens element L38 is a biconvex lens element with positive refractive power, and its image-side surface S317 is a convex surface;
the ninth lens element L39 has positive refractive power, and has an object-side surface S318 and an image-side surface S319 which are aspheric surfaces;
the filter OF3 has an object-side surface S320 and an image-side surface S321 both being planar;
the object-side surface S322 and the image-side surface S323 of the cover glass CG3 are both planar.
By using the above lens, the diaphragm ST3 and the design at least satisfying one of the conditions (1) to (5), the imaging lens 3 can effectively reduce the diaphragm value, effectively improve the resolution, and effectively resist the environmental temperature variation.
If condition (4) f 7 /f 8 If the value of (d) is greater than 0.7, the function of correcting the aberration is not good. Thus, f 7 /f 8 The value of (a) is at least less than 0.7, so that the optimum effect is in the range-1.2 < f 7 /f 8 Is less than 0.7, and the optimal aberration correction condition is achieved according to the range, and the assembling sensitivity of the imaging lens is reduced.
Table six is a table of parameters related to the respective lenses of the imaging lens 3 in fig. 5.
Watch six
The definition of the aspheric surface sag z of the aspheric lens in table six is the same as that of the aspheric lens in table three in the second embodiment, and is not repeated herein.
Table seven is a table of parameters associated with the aspherical surfaces of the aspherical lenses of Table six, where k is a Conic coefficient (Conic Constant) and A to D are aspherical coefficients.
Watch seven
Table eight shows the values of the parameters associated with the imaging lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (5), and it can be seen from table eight that the imaging lens 3 of the third embodiment can satisfy the requirements of the conditions (1) to (5).
Watch eight
In addition, the optical performance of the imaging lens 3 of the third embodiment can also be satisfied, as can be seen from fig. 6A to 6C. Fig. 6A is a view showing a curvature of field of the imaging lens 3 of the third embodiment. Fig. 6B is a diagram showing a distortion of the imaging lens 3 of the third embodiment. Fig. 6C is a lateral chromatic aberration diagram of the imaging lens 3 of the third embodiment.
As can be seen from fig. 6A, the field curvature of the imaging lens 3 of the third embodiment is between-0.015 mm to 0.025 mm.
As can be seen from fig. 6B, the distortion of the imaging lens 3 of the third embodiment is between-9% and 0%.
As can be seen from fig. 6C, the imaging lens 3 of the third embodiment has a lateral chromatic aberration between 0 μm and 2.2 μm.
It is apparent that the curvature of field, distortion, and lateral chromatic aberration of the imaging lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.
The invention meets the conditions that f/TTL is more than 0.2 and less than 0.35 and f is more than 1 1234 /f＜2.1、-1.2＜f 7 /f 8 Centered at < 0.7, the values for the examples of the invention also fall within the range of the remaining conditions. The condition that f/TTL is more than 0.2 and less than 0.35 can help the imaging lens to achieve miniaturization. Condition 1 < f 1234 The/f is less than 2.1, so that the resolution ratio can be obviously improved. Formula-1.2 < f 7 /f 8 Less than 0.7, the function of correcting aberration can be improved.
Although the present invention has been described with reference to the above embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An imaging lens, characterized by comprising:
the first lens has negative refractive power and comprises a concave surface facing the image side;
the second lens has negative refractive power;
the third lens has positive refractive power;
the fourth lens has positive refractive power;
the fifth lens has positive refractive power;
the sixth lens has negative refractive power;
the seventh lens has positive refractive power;
the eighth lens has refractive power; and
the ninth lens element is a meniscus lens element, and the ninth lens element has a convex surface facing the object side and a concave surface facing the image side;
wherein 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, the eighth lens element and the ninth lens element are sequentially disposed along an optical axis from the object side to the image side;
the imaging lens further comprises an aperture, and at least one of the following conditions is satisfied:
0.2＜f/TTL＜0.35；
7.5＜T 9 /T 1 ＜14；
1.3＜A/IH＜2.1；
f is the effective focal length of the imaging lens, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, T 1 Is the thickness of the first lens on the optical axis, T 9 The thickness of the ninth lens element on the optical axis, A is the diameter of the aperture stop, and IH is the maximum image height of the imaging lens.
2. The imaging lens of claim 1, characterized in that:
the third lens element includes a convex surface facing the image side; and
the sixth lens element includes a concave surface facing the object side.
3. The imaging lens of claim 2, characterized in that:
the first lens further comprises a concave surface facing the object side;
the second lens comprises a concave surface facing the object side; and
the fourth lens is a meniscus lens.
4. The imaging lens according to any one of claims 1 to 3, characterized in that:
the second lens element includes a convex surface facing the image side;
the third lens element includes a convex surface facing the object side;
the fourth lens element includes a convex surface facing the object side and a concave surface facing the image side;
the fifth lens element comprises a convex surface facing the object side and another convex surface facing the image side;
the sixth lens element comprises a concave surface facing the image side;
the seventh lens element includes a convex surface facing the object side and another convex surface facing the image side;
the eighth lens element with positive refractive power comprises a convex surface facing the object side and another convex surface facing the image side; and
the ninth lens element with negative refractive power has a convex surface facing the object side and a concave surface facing the image side.
5. The imaging lens according to any one of claims 1 to 3, characterized in that:
the second lens is a meniscus lens;
the fourth lens is a meniscus lens;
the seventh lens element includes a convex surface facing the object side and another convex surface facing the image side;
the eighth lens element with negative refractive power has a convex surface facing the object side and a concave surface facing the image side; and
the ninth lens element with a meniscus shape has a positive refractive power, and has a convex surface facing the object side and a concave surface facing the image side.
6. The imaging lens according to any one of claims 1 to 3, characterized in that:
the seventh lens element comprises a concave surface facing the image side;
the eighth lens element with positive refractive power comprises a convex surface facing the object side and another convex surface facing the image side; and
the ninth lens element with a meniscus refractive power has a positive refractive power, and includes a convex surface facing the object side and a concave surface facing the image side;
the imaging lens assembly further includes a tenth lens disposed between the sixth lens and the seventh lens, the tenth lens being a meniscus lens with a negative refractive power, the tenth lens including a convex surface facing the object side and a concave surface facing the image side.
7. The imaging lens according to any one of claims 1 to 3, characterized in that: the imaging lens at least meets one of the following conditions:
1＜f 1234 /f＜2.1；
-1.2＜f 7 /f 8 ＜0.7；
wherein f is the effective focal length of the imaging lens, f 1234 Is the combined effective focal length of the first lens, the second lens, the third lens and the fourth lens, f 7 Is the effective focal length of the seventh lens, f 8 The effective focal length of the eighth lens.
8. The imaging lens of claim 6, wherein: the fifth lens is cemented with the sixth lens or the seventh lens is cemented with the eighth lens.
9. An imaging lens, characterized in that, there are nine lenses having refractive powers along an optical axis from an object side to an image side:
the first lens has negative refractive power and comprises a concave surface facing the image side;
the second lens has negative refractive power;
the third lens has positive refractive power;
the fourth lens has positive refractive power;
the fifth lens has positive refractive power;
the sixth lens has negative refractive power;
the seventh lens has positive refractive power;
the eighth lens has refractive power; and
the ninth lens element is a meniscus lens element, the ninth lens element having a convex surface facing the object side and a concave surface facing the image side;
wherein 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, the eighth lens element and the ninth lens element are sequentially disposed along an optical axis from the object side to the image side;
the imaging lens meets the following conditions:
1＜f 1234 /f＜2.1；
-1.2＜f 7 /f 8 ＜0.7；
wherein f is the effective focal length of the imaging lens, f 1234 Is the combined effective focal length of the first lens, the second lens, the third lens and the fourth lens, f 7 Is the effective focal length of the seventh lens, f 8 Is the effective focal length of the eighth lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910842019.3A CN112462485B (en) | 2019-09-06 | 2019-09-06 | Imaging lens |
| US17/000,470 US11815666B2 (en) | 2019-09-06 | 2020-08-24 | Wide-angle lens assembly including nine lenses of −−+++−++− or −−+++−+−+, or ten lenses of −−+++−−+++ or −−−+++−+−+ refractive powers |
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| CN201910842019.3A CN112462485B (en) | 2019-09-06 | 2019-09-06 | Imaging lens |
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| CN112462485B true CN112462485B (en) | 2022-07-26 |
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| CN115268014A (en) * | 2021-04-29 | 2022-11-01 | 信泰光学(深圳)有限公司 | Wide-angle lens |
| CN114442276B (en) * | 2022-01-12 | 2024-08-13 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN114779440B (en) * | 2022-04-29 | 2024-01-12 | 福建福光天瞳光学有限公司 | 8K ultra-high definition optical lens and imaging method thereof |
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