CN115524833A - Optical imaging lens - Google Patents
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- CN115524833A CN115524833A CN202211347703.2A CN202211347703A CN115524833A CN 115524833 A CN115524833 A CN 115524833A CN 202211347703 A CN202211347703 A CN 202211347703A CN 115524833 A CN115524833 A CN 115524833A
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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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Abstract
The present disclosure relates to the field of imaging lenses, and more particularly, to an optical imaging lens, which includes a first lens element to a ninth lens element along an optical axis in sequence from an object side to an image side; the first lens, the second lens, the third lens and the fourth lens respectively comprise an object side surface which faces the object side and enables the imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through; the first lens has a negative optical power, the second lens has a negative optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, the fifth lens has a positive optical power, the sixth lens has a negative optical power, the seventh lens has a positive optical power, the eighth lens has a positive optical power, the ninth lens has a positive optical power, and the following conditions are satisfied: 1.4<(f Front side /f Rear end )<2.1; the spherical lens and the non-spherical lens are matched for use, so that the imaging quality is good.
Description
Technical Field
The patent relates to the field of imaging lenses, in particular to an optical imaging lens.
Background
With the increasing development of wireless technology, wireless transmission technology is more and more accepted by various industries. As a special use mode, wireless image transmission is gradually seen by the majority of users and widely applied to work and life, and video conferences also play an important role in work. The existing video conference lens adopts too many lenses to correct aberration, so that the overall cost of the lens is too high; the imaging quality of the lens is poor due to the large distortion and the small imaging range of the lens, and the requirement of high-definition imaging cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an optical imaging lens which can solve the technical problems that the cost is increased due to more lenses, the imaging quality of the lens is poor due to larger lens distortion and small imaging range and the like.
In order to solve the technical problems, the invention provides the following technical scheme:
an optical imaging lens includes, in order along an optical axis from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element, and a ninth lens element; the first lens, the second lens, the third lens and the fourth lens respectively comprise an object side surface which faces the object side and enables the imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through;
the first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the third lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a plane or a concave surface;
the fifth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface;
the seventh lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the eighth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the ninth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
and the following conditional expressions are satisfied:
1.4<(f front side /f Rear end )<2.1；
The first to fourth lenses are front groups, the fifth to ninth lenses are rear groups, and f Front part Is the focal length of the front group lens, said f Rear end The focal length of the rear group lens.
Further, the following conditional formula is satisfied, 0.7<│f 4 /f Front part │<1.2, said f 4 Is the focal length of the fourth lens.
Further, the following conditional expression is satisfied, 6mm<CT 4 The CT 4 Is the thickness of the fourth lens along the optical axis.
Further, the following conditional expression is satisfied, TTL/(f × IMH (1-DIS)) <2.5, where f is a focal length of the lens, TTL is an optical total length of the lens, IMH is a half-image height of the lens, and DIS is an optical distortion of the lens.
Further, the following conditional formulae are satisfied, 1.6 yarn and 1.8, 1.5 yarn and 2 yarn 1.7, 1.5 yarn and 3 yarn 1.6, 1.8 yarn and 4, 1.5 yarn and 5 yarn 1.7, 1.6 yarn and 6 yarn 1.7, 1.5 yarn and 7 yarn 1.6, 1.5 yarn and 8 yarn 1.7 and 1.6 yarn and 9 yarn 1.7, and nd1 to nd9 are respectively the refractive indices of the first lens to the ninth lens.
Further, in accordance with a series of conditional expressions, 50-bundle-vd1-s 65, 60-bundle-vd2-s 70, 50-bundle-vd3-s 60, vd 4-s 30, 50-bundle-vd5-s 60, vd 6-s 30, 50-bundle-vd7-s 60, 50-bundle-vd8-s 60 and 50-bundle-vd9-s 70, the vd 1-vd 9 being abbe numbers of the first lens to the ninth lens, respectively.
Further, the following conditional expression, 19, is satisfied<f 1 <23、13<f 2 <14、7<f 3 <8、8.5<f 4 <9.5、 5<f 5 <7、4<f 6 <5、5<f 7 <6、4<f 8 <27 and 20<f 9 <30, said f 1 To f 9 The focal lengths of the first lens to the ninth lens are respectively.
Further, the following conditional formula, 7.5 is satisfied<(f 1 /f)<9、2<(f 2 /f)<3、2.5<(f 3 /f)<4.5、 2<(f 4 /f)<3、2<(f 5 /f)<3、2.5<(f 6 /f)<3.5、1.5<(f 7 /f)<3、2<(f 8 /f)<10 and 2<(f 9 /f)<4, said f 1 To f 9 The focal lengths of the first lens to the ninth lens are respectively.
Further, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses, and the first lens, the second lens, the fourth lens, the eighth lens and the ninth lens are all glass spherical lenses.
Further, the following conditional expression is satisfied, 2.49mm and f are both restricted to 2.51mm, and f is the focal length of the lens.
The invention has the beneficial effects that:
this scheme adopts nine formula structures, and wherein spherical lens and aspheric surface lens collocation use for optical imaging system is when spatial frequency reaches 125lp/mm, and full visual angle MTF all is greater than 0.41, has better imaging, can arrange 1/1.8 sensor, can reach 4K formation of image definition, satisfies user high definition's user demand. Meanwhile, distortion is controlled within 17%, normal image display is guaranteed, the phenomenon of figure distortion is reduced, and imaging quality is good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a light path diagram of an optical imaging lens according to a first embodiment of the present invention;
fig. 2 is a MTF graph of an optical imaging lens according to a first embodiment of the present invention;
FIG. 3 is a defocus graph of an optical imaging lens according to a first embodiment of the present invention;
FIG. 4 is a lateral chromatic aberration diagram of an optical imaging lens according to a first embodiment of the present invention;
fig. 5 is a longitudinal chromatic aberration curve of an optical imaging lens according to the first embodiment of the present invention;
FIG. 6 is a field curvature and distortion diagram of an optical imaging lens according to a first embodiment of the present invention;
fig. 7 is an optical path diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 8 is a MTF graph of an optical imaging lens according to a second embodiment of the present invention;
FIG. 9 is a defocus graph of an optical imaging lens according to a second embodiment of the present invention;
FIG. 10 is a lateral chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 11 is a longitudinal chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 12 is a diagram of curvature of field and distortion of an optical imaging lens according to a second embodiment of the present invention;
fig. 13 is a light path diagram of an optical imaging lens according to a third embodiment of the present invention;
fig. 14 is a MTF graph of an optical imaging lens according to a third embodiment of the present invention;
fig. 15 is a defocus graph of an optical imaging lens according to a third embodiment of the present invention;
FIG. 16 is a lateral chromatic aberration diagram of an optical imaging lens according to a third embodiment of the present invention;
fig. 17 is a longitudinal chromatic aberration curve diagram of an optical imaging lens according to a third embodiment of the present invention;
fig. 18 shows curvature of field and distortion of an optical imaging lens according to the third embodiment of the present invention.
Description of the main elements
1. A first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. A sixth lens; 7. a seventh lens; 8. an eighth lens; 9. a ninth lens; 10. a diaphragm; 11. a protective sheet; 12. an image plane.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1 to 18, an optical imaging lens includes, in order along an optical axis from an object side to an image side, a first lens element 1, a second lens element 2, a third lens element 3, a fourth lens element 4, a fifth lens element 5, a sixth lens element 6, a seventh lens element 7, an eighth lens element 8, and a ninth lens element 9; the first lens element 1 to the ninth lens element 9 each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light; further comprising a diaphragm 10, the diaphragm 10 being arranged between the fourth lens 4 and the fifth lens 5.
The first lens 1 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens 2 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the third lens 3 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens 4 has positive focal power, the object side surface is a convex surface, and the image side surface is a plane or a concave surface;
the fifth lens 5 has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens 6 has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface;
the seventh lens 7 has positive focal power, and the object side surface is a convex surface and the image side surface is a convex surface;
the eighth lens 8 has positive focal power, and the object-side surface is a convex surface and the image-side surface is a convex surface;
the ninth lens 9 has positive focal power, and has a convex object-side surface and a convex image-side surface;
the image side surfaces of the first lens 1, the second lens 2 and the third lens 3 are all bent towards the direction of the diaphragm 10, so that the low-distortion imaging effect of the lens can be realized under the condition of a large angle. The third lens 3, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are all plastic aspheric lenses, and the first lens 1, the second lens 2, the fourth lens 4, the eighth lens 8 and the ninth lens 9 are all glass spherical lenses. The optical structure can be better optimized by adding a plurality of plastic aspheric lenses in the glass spherical lens, and the design value can be better reached in the design process of the optical imaging lens.
Preferably, the following conditional formula is satisfied: 1.4<(f Front side /f Rear end )<2.1; the first lens element 1 to the fourth lens element 4 are front group, the fifth lens element 5 to the ninth lens element 9 are rear group, f Front part Focal length of front group lens, f Rear end For the focal length of the rear group lens, the front group lens and the rear group lens are controlled to meet the formula, the focal power ratio between the front group lens and the rear group lens can be better distributed, and then the imaging effect of the optical imaging lens is better controlled.
Preferably, the following conditional expression is satisfied, 6mm<CT 4 ，CT 4 The thickness of the fourth lens 4 is increased for the thickness of the fourth lens 4 along the optical axis, so that the aberration of the front three lenses caused by the corrected distortion can be better corrected, and the aberration of the front group of lenses can be more effectively controlled.
Preferably, the following conditional formula is satisfied: 0.7<│f 4 /f Front part │<1.2，f 4 The fourth lens 4 is increased for its focal lengthWhen the thickness of the lens 4 is reduced, the focal length ratio between the fourth lens 4 and the front group lens is controlled, so that the focal power of the front group lens can be better corrected, and the aberration correction capability of the optical imaging lens is improved.
Preferably, the following conditional formula is satisfied: TTL/(f IMH (1-DIS)) <2.5, f is the focal length of the lens, TTL is the optical total length of the lens, IMH is the half-image height of the lens, namely the half of the maximum image height of the lens; DIS is the optical distortion of camera lens, and control optical imaging lens satisfies the above formula, and optical imaging lens is the better control optics total length under the prerequisite of low distortion, has less volume, does benefit to the assembly of camera lens.
Preferably, the following conditional formula is satisfied: the 2.49mm and the f are woven together for 2.51mm, the HFOV is greater than or equal to 120 degrees, and the TTL is less than or equal to 30mm, the HFOV is the maximum field range which can be shot by the horizontal field of the optical imaging lens, the shooting range is large, and the image plane can contain larger picture frames. The field angle and the total optical length of the lens are controlled, and the characteristics of large field of view and small integral volume are met.
Preferably, the following conditional formula is satisfied: 1.6-nd1-type yarns 1.8, 1.5-nd2-type yarns 1.7, 1.5-nd3-type yarns 1.6, 1.8-type yarns nd4, 1.5-type yarns nd5-type yarns 1.7, 1.6-type yarns nd6-type yarns 1.7, 1.5-type yarns nd7-type yarns 1.6, 1.5-type yarns nd8-type yarns 1.7 and 1.6-type yarns nd-type yarns 1.7, and nd1 to nd9 are refractive indices of the first lens 1 to the ninth lens 9, respectively.
Preferably, the series of conditional expressions is satisfied: 50-n-vd1-s 65, 60-n-vd2-s 70, 50-n-vd3-s 60, vd4<30, 50-n-vd5-s 60, vd6<30, 50-n-vd7-s 60, 50-n-vd8-s 60 and 50-n-vd9-s 70, respectively, are Abbe's coefficients of the first lens 1 to the ninth lens 9.
Preferably, the following conditional formula is satisfied: 19<f 1 <23、13<f 2 <14、7<f 3 <8、8.5<f 4 <9.5、 5<f 5 <7、4<f 6 <5、5<f 7 <6、4<f 8 <27 and 20<f 9 <30，f 1 To f 9 The focal lengths of the first lens 1 to the ninth lens 9, respectively.
Preferably, the following conditional formula is satisfied, 7.5<(f 1 /f)<9、2<(f 2 /f)<3、2.5<(f 3 /f)<4.5、 2<(f 4 /f)<3、2<(f 5 /f)<3、2.5<(f 6 /f)<3.5、1.5<(f 7 /f)<3、2<(f 8 /f)<10 and 2<(f 9 /f)<4。
The optical imaging lens according to the present invention will be described in detail with specific embodiments.
Example one
Referring to fig. 1-6, an optical imaging lens includes, in order along an optical axis from an object side to an image side, a first lens element 1 to a ninth lens element 9; the first lens element 1 to the ninth lens element 9 each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light; further comprising a diaphragm 10, the diaphragm 10 being arranged between the fourth lens 4 and the fifth lens 5.
The first lens 1 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens 2 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the third lens 3 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens 4 has positive focal power, the object side surface is a convex surface, and the image side surface is a plane;
the fifth lens 5 has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens 6 has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface;
the seventh lens 7 has positive focal power, and the object-side surface is a convex surface and the image-side surface is a convex surface;
the eighth lens 8 has positive focal power, and the object-side surface is a convex surface and the image-side surface is a convex surface;
the ninth lens 9 has positive focal power, and has a convex object-side surface and a convex image-side surface;
the detailed optical data of this embodiment is shown in table 1.
Table 1 detailed optical data of example one
In this embodiment, the third lens 3, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are all plastic aspheric lenses, and the aspheric surfaces of the third lens 3, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are described in detail with reference to the following table 2:
table 2: coefficient of aspheric surface
The focal length of the optical imaging lens described in this embodiment is 2.50mm, ttl is 30mm, and f # =2.4.
In this embodiment, please refer to fig. 1 for a light path diagram of an optical imaging lens. Referring to fig. 2, it can be seen that, when the spatial frequency of the optical imaging lens reaches 125lp/mm, the MTF curve of the optical imaging lens with different focal lengths under the band of visible light 435nm to 650nm, which is disclosed in this embodiment, is greater than 0.41 for all the viewing angles, so that the optical imaging lens has a better imaging effect, can be matched with a 1/1.8 sensor, can achieve a 4K imaging definition, and meets the use requirement of a user for high definition. Referring to fig. 3, different curves represent defocus curves in the meridional direction and the sagittal direction in different fields of view, and as can be seen from fig. 3, peaks of almost all curves are near the zero-offset vertical axis, and at this time, the defocus characteristic of the optical imaging lens is excellent, and a larger effective focal depth range can be obtained. Referring to fig. 4, a transverse chromatic aberration curve of the optical imaging lens disclosed in this embodiment in a visible light band of 435nm to 650nm is shown, and it can be seen from fig. 4 that a maximum transverse chromatic aberration of the optical imaging lens in a visible light band is 18 μm; referring to fig. 5, it can be seen from fig. 5 that the maximum longitudinal chromatic aberration of the optical imaging lens in the visible light band is 0.04mm, and the transverse chromatic aberration and the longitudinal chromatic aberration of the optical imaging lens disclosed in this embodiment are better corrected. Referring to fig. 6, it can be seen from fig. 6 that the optical distortion of the optical imaging lens disclosed in this embodiment is less than 17%, the imaging quality is good, and the difficulty of later correction is reduced.
Example two
Referring to fig. 7-12, an optical imaging lens includes, in order from an object side to an image side along an optical axis, a first lens element 1 to a ninth lens element 9; the first lens element 1 to the ninth lens element 9 each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light; a diaphragm 10 is also included, the diaphragm 10 being arranged between the fourth lens 4 and the fifth lens 5.
The first lens 1 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens 2 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the third lens 3 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens 4 has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fifth lens 5 has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens element 6 has a negative focal power, and has a concave object-side surface and a concave image-side surface;
the seventh lens 7 has positive focal power, and the object-side surface is a convex surface and the image-side surface is a convex surface;
the eighth lens 8 has positive focal power, and the object-side surface is a convex surface and the image-side surface is a convex surface;
the ninth lens 9 has positive focal power, and has a convex object-side surface and a convex image-side surface;
the detailed optical data for this embodiment is shown in table 3.
Table 3 detailed optical data of example one
In this embodiment, the third lens 3, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are all plastic aspheric lenses, and the aspheric surfaces of the third lens 3, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are described in detail with reference to the following table 4:
table 4: coefficient of aspheric surface
The optical imaging lens described in this embodiment has a focal length of 2.50mm, a ttl of 30mm, and an f # =2.4.
In this embodiment, please refer to fig. 7 for a light path diagram of the optical imaging lens. Referring to fig. 8, it can be seen that when the spatial frequency of the optical imaging lens of this embodiment reaches 125lp/mm, the MTF of the optical imaging lens with different focal lengths in the visible light 435nm-650nm band is greater than 0.40, which has a better imaging effect, and can be matched with a 1/1.8 sensor, so as to achieve 4K imaging definition and meet the user requirement of high definition. Referring to fig. 9, different curves represent defocus curves in the meridional direction and the sagittal direction in different fields of view, and as can be seen from fig. 9, peaks of almost all curves are near the zero-offset vertical axis, and at this time, the defocus characteristic of the optical imaging lens is excellent, and a larger effective focal depth range can be obtained. Referring to fig. 10, a transverse chromatic aberration curve of the optical imaging lens disclosed in this embodiment in a visible light band of 435nm to 650nm is shown, and it can be seen from fig. 10 that a maximum transverse chromatic aberration of the optical imaging lens in a visible light band is 18.2 μm; referring to fig. 11, it can be seen from fig. 11 that the maximum longitudinal chromatic aberration of the optical imaging lens working in the visible light band is 0.04mm, and the lateral chromatic aberration and the longitudinal chromatic aberration of the optical imaging lens disclosed in this embodiment are well corrected. Referring to fig. 12, it can be seen from fig. 12 that the optical distortion of the optical imaging lens disclosed in this embodiment is less than 16.5% in the field curvature distortion curve of the visible light at a wavelength band of 435nm to 650nm, the imaging quality is good, and the difficulty in the later correction is reduced.
EXAMPLE III
Referring to fig. 13-18, an optical imaging lens includes, in order from an object side to an image side along an optical axis, a first lens element 1 to a ninth lens element 9; the first lens element 1 to the ninth lens element 9 each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough; further comprising a diaphragm 10, the diaphragm 10 being arranged between the fourth lens 4 and the fifth lens 5.
The first lens 1 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens 2 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the third lens 3 has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens 4 has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fifth lens 5 has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens element 6 has a negative focal power, and has a concave object-side surface and a concave image-side surface;
the seventh lens 7 has positive focal power, and the object side surface is a convex surface and the image side surface is a convex surface;
the eighth lens 8 has positive focal power, and the object-side surface is a convex surface and the image-side surface is a convex surface;
the ninth lens 9 has positive focal power, and has a convex object-side surface and a convex image-side surface;
the detailed optical data for this embodiment is shown in table 5.
Table 5 detailed optical data of example one
In this embodiment, the third lens 3, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all plastic aspheric lenses, and the aspheric surfaces of the third lens 3, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are described in detail with reference to the following table 6:
table 6: coefficient of aspheric surface
The optical imaging lens described in this embodiment has a focal length of 2.497mm, a ttl of 30mm, and an f # =2.4.
In this embodiment, please refer to fig. 13 for a light path diagram of the optical imaging lens. Referring to fig. 14, it can be seen that when the spatial frequency of the optical imaging lens of this embodiment reaches 125lp/mm, the MTF of the optical imaging lens with different focal lengths in the visible light 435nm-650nm band is greater than 0.40, which has a better imaging effect, and can be matched with a 1/1.8 sensor, so as to achieve 4K imaging definition, and meet the user requirement of high definition. Referring to fig. 15, different curves represent defocus curves in the meridional direction and the sagittal direction in different fields of view, and as can be seen from fig. 15, peaks of almost all curves are near the zero-offset vertical axis, and at this time, the defocus characteristic of the optical imaging lens is excellent, and a larger effective focal depth range can be obtained. Referring to fig. 16, a transverse chromatic aberration curve of the optical imaging lens disclosed in this embodiment in a visible light band of 435nm to 650nm is shown, and it can be seen from fig. 16 that a maximum transverse chromatic aberration of the optical imaging lens in a visible light band is 18 μm; referring to fig. 17, it can be seen from fig. 17 that the maximum longitudinal chromatic aberration of the optical imaging lens operating in the visible light band is 0.04mm, and the transverse chromatic aberration and the longitudinal chromatic aberration of the optical lens are better corrected. Referring to fig. 18, it can be seen from fig. 18 that the optical distortion of the optical imaging lens disclosed in this embodiment is less than 17% in a field curvature distortion curve of the visible light in a wavelength band of 435nm to 650nm, so that the imaging picture display is ensured to be normal, the phenomenon of figure distortion is reduced, the imaging quality is good, and the difficulty of later correction is reduced.
Table 7 shows the values of relevant important parameters for three examples of the invention:
table 7: relevant important parameters of various embodiments
| Conditional formula (II) | Example 1 | Example 2 | Example 3 |
| 0.7<│f 4 /f Front side │<1.2 | 0.7935 | 1.1689 | 1.1673 |
| 6<CT 4 | 6.904 | 6.325 | 6.976 |
| EFL | 2.7659 | 2.7653 | 2.7606 |
| 1.4<(f Front part /f Rear end )<2.1 | 2.012 | 1.478 | 1.506 |
| TTL/(f*IMH*(1-DIS))<2.5 | 2.335 | 2.332 | 2.338 |
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An optical imaging lens is characterized by comprising 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 in sequence from an object side to an image side along an optical axis; the first lens element to the ninth lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the third lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a plane or a concave surface;
the fifth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface;
the seventh lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the eighth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
the ninth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface;
and the following conditional expressions are satisfied:
1.4<(f front side /f Rear end )<2.1；
The first to fourth lenses are front groups, the fifth to ninth lenses are rear groups, and f Front side Is the focal length of the front group lens, said f Rear end The focal length of the rear group lens.
2. The optical imaging lens according to claim 1, characterized in that: satisfies the following conditional formula, 0.7<│f 4 /f Front side │<1.2, said f 4 Is the focal length of the fourth lens.
3. The optical imaging lens of claim 1, characterized in that: according to the following conditional formula, 6mm<CT 4 The CT 4 Is the thickness of the fourth lens along the optical axis.
4. The optical imaging lens according to claim 1, characterized in that: according to the following conditional expression, TTL/(f IMH (1-DIS)) <2.5, wherein f is the focal length of the lens, TTL is the optical total length of the lens, IMH is the half-image height of the lens, and DIS is the optical distortion of the lens.
5. The optical imaging lens of claim 1, characterized in that: the following conditional expressions are satisfied, 1.6-nd 1-or 1.8-or 1.5-or-nd 2-or-quarter 1.7-or 1.5-or-quarter 3-or-1.6-or 1.8-or-quarter 4-or 1.5-or-quarter 5-or-quarter 1.7-or 1.6-or-quarter 1.7-or 1.5-or-quarter 1.6-or-quarter 8-or-quarter 1.7-or 1.6-or-quarter 9-or-quarter 1.7-or-quarter, and nd1 to nd9 are refractive indices of first to ninth lenses, respectively.
6. The optical imaging lens of claim 1, characterized in that: in accordance with a series of conditional expressions, 50-t & lt 1 & gt, 65, 60-t & lt 2 & gt, 50-t & lt 3 & gt, v & lt 4 & lt 30, 50-t & lt 5 & gt, v & lt 6 & lt 30, 50-t & lt 7 & lt 60, 50-t & lt 8 & gt, 60 and 50-t 9 & lt 70 & gt are provided, and the v & lt 1 & gt to the v & lt 9 & gt are respectively abbe coefficients of first to ninth lenses.
7. The optical imaging lens according to claim 1, characterized in that: satisfies the following conditional formula 19<f 1 <23、13<f 2 <14、7<f 3 <8、8.5<f 4 <9.5、5<f 5 <7、4<f 6 <5、5<f 7 <6、4<f 8 <27 and 20<f 9 <30, said f 1 To f 9 The focal lengths of the first lens to the ninth lens are respectively.
8. The optical imaging lens according to claim 1, characterized in that: satisfies the following conditional formula, 7.5<(f 1 /f)<9、2<(f 2 /f)<3、2.5<(f 3 /f)<4.5、2<(f 4 /f)<3、2<(f 5 /f)<3、2.5<(f 6 /f)<3.5、1.5<(f 7 /f)<3、2<(f 8 /f)<10 and 2<(f 9 /f)<4, said f 1 To f 9 The focal lengths of the first lens to the ninth lens are respectively, and f is the focal length of the lens.
9. The optical imaging lens according to claim 1, characterized in that: the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses, and the first lens, the second lens, the fourth lens, the eighth lens and the ninth lens are all glass spherical lenses.
10. The optical imaging lens according to claim 1, characterized in that: the following conditional expression is met, 2.49mm and f are woven together for 2.51mm, and f is the focal length of the lens.
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| CN202211347703.2A CN115524833B (en) | 2022-10-31 | 2022-10-31 | Optical imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150362746A1 (en) * | 2014-06-13 | 2015-12-17 | Pegavision Corporation | Toric lens |
| CN108919468A (en) * | 2018-09-26 | 2018-11-30 | 浙江舜宇光学有限公司 | Optical imaging lens |
| US20180360298A1 (en) * | 2017-06-16 | 2018-12-20 | avateramedical GmBH | Objective Lens for an Endoscope |
| CN113109929A (en) * | 2021-06-16 | 2021-07-13 | 江西联创电子有限公司 | Optical imaging lens and imaging apparatus |
| CN114942515A (en) * | 2022-06-15 | 2022-08-26 | 厦门力鼎光电股份有限公司 | Wide-angle low-distortion optical imaging lens |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150362746A1 (en) * | 2014-06-13 | 2015-12-17 | Pegavision Corporation | Toric lens |
| US20180360298A1 (en) * | 2017-06-16 | 2018-12-20 | avateramedical GmBH | Objective Lens for an Endoscope |
| CN108919468A (en) * | 2018-09-26 | 2018-11-30 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN113109929A (en) * | 2021-06-16 | 2021-07-13 | 江西联创电子有限公司 | Optical imaging lens and imaging apparatus |
| CN114942515A (en) * | 2022-06-15 | 2022-08-26 | 厦门力鼎光电股份有限公司 | Wide-angle low-distortion optical imaging lens |
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