CN211402913U - Ultra-small zoom lens - Google Patents
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- CN211402913U CN211402913U CN202020261695.XU CN202020261695U CN211402913U CN 211402913 U CN211402913 U CN 211402913U CN 202020261695 U CN202020261695 U CN 202020261695U CN 211402913 U CN211402913 U CN 211402913U
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Abstract
The utility model discloses a super small zoom adopts the mixed 9 formula designs of moulding of glass, is first lens, second lens, third lens, fourth lens, diaphragm, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens according to the preface by thing side to picture side, and wherein first, second, third, seventh, ninth lens have negative refractive index, and fourth, fifth, sixth and eighth lens utensil positive refractive index. The design can effectively shorten the length of the lens and maintain the system performance, and simultaneously covers common short-focus using focus sections, such as focus sections of 2.8mm, 3.6mm, 4mm, 6mm, 8mm and the like, so that the total application range of the lens is wider, and the cost performance is extremely high.
Description
Technical Field
The utility model belongs to the technical field of the security protection control, specifically relate to an ultra-small zoom.
Background
The monitoring cameras are increasingly applied, and gradually put forward the requirements of 24-hour continuous monitoring, monitoring in a low-illumination environment, large-view monitoring and the like, so that the trend of requiring high-definition monitoring images is promoted.
In factory, building and parking lot which require continuous monitoring for 24 hours, there is an increasing demand for small-sized and high-quality day and night cameras. The day and night camera has the advantage that clear images can be observed even in an environment with low illumination and even no visible light illumination, by using a night mode (black and white images at night) and illuminating a monitored object with a near infrared lamp. Meanwhile, the monitoring object can be observed and identified.
If the common daily-use lens is arranged on a camera for day and night use, when a night mode is used, due to the influence of longitudinal chromatic aberration, focusing can generate an eccentric focus, and clear images cannot be acquired. In order to prevent the occurrence of a partial focus and to enable the lens to be used in a day-night camera, it is necessary to reduce longitudinal chromatic aberration as much as possible in a range from a visible light region to a near-infrared light region.
The optical monitoring lens on the market at present has the obvious defects that The Total Length (TTL) of the optical lens is too large, and the number of lenses is too large, so that the overall cost and the volume of the lens are too high, and the use is influenced; the transfer function is not well controlled, the resolution is low, the image sharpness is poor, and the image is not uniform; the focal length span is small, the field angle span is small, and the switching flexibility is poor; the infrared confocal performance is poor, the defocusing amount is large when visible infrared is switched, and the image quality is poor when infrared is used; and low variable multiple, imperfect covering focal length section and low practicability.
Therefore, the utility model provides a novel day and night dual-purpose super small zoom monitoring lens.
SUMMERY OF THE UTILITY MODEL
In order to improve the existing monitoring lens, the utility model provides a super-small zoom lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens from an object side to an image side in sequence;
the first lens element with negative refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is concave;
the second lens element with negative refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is concave and the image-side surface is concave;
the third lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is concave;
the fourth lens element with positive refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is convex;
the fifth lens element with positive refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is concave;
the sixth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is convex;
the seventh lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is concave and the image-side surface is concave;
the eighth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is convex;
the ninth lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is concave and the image-side surface is convex.
The first to fourth lenses constitute a focusing lens group; the fifth to ninth constitute a variable power lens group.
The ultra-small zoom lens has only nine lenses with the refractive index.
Preferably, the ultra-small zoom lens further satisfies: the third lens and the fourth lens are mutually glued.
Preferably, the ultra-small zoom lens further satisfies: the sixth lens and the seventh lens are cemented to each other.
Preferably, the ultra-small zoom lens further satisfies: and | vd4-vd3| >30, wherein vd3 and vd4 are the abbe numbers of the third lens and the fourth lens respectively.
Preferably, the ultra-small zoom lens further satisfies: and | vd7-vd6| >30, wherein vd6 and vd7 are the abbe numbers of the sixth lens and the seventh lens, respectively.
Preferably, the ultra-small zoom lens further satisfies: the third lens and the ninth lens are designed to be 16-order even-order plastic aspheric surfaces.
Preferably, the ultra-small zoom lens further satisfies: the first lens and the seventh lens are made of high-refractive-index materials, and nd1 is 1.835, and nd7 is 1.847, wherein nd1 is the refractive index of the first lens, and nd7 is the refractive index of the seventh lens.
Preferably, the ultra-small zoom lens further satisfies: the second lens, the third lens and the sixth lens are made of materials with larger dispersion coefficients, wherein vd 2-58.35, vd 3-59.51, vd 6-51.16, and vd2, vd3 and vd6 are the dispersion coefficients of the second lens, the third lens and the sixth lens respectively.
The beneficial effects of the utility model reside in that:
1. the optical TTL is less than 33mm, and a glass-plastic mixed 9-piece design is adopted, so that the overall size of the lens is small, and the manufacturing cost is low;
2. the transfer function is well controlled, the resolution is high (2K), the resolution is high, the image sharpness is high, and the image is uniform;
3. the focal length span is large, the field angle span is large, and the switching flexibility is strong;
4. and the switching piece is used for visible-infrared switching, so that the infrared imaging quality is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a first embodiment of the present invention at a shortest focal length;
fig. 2 is a schematic structural view of the first embodiment of the present invention at the longest focal length;
fig. 3 is a graph of MTF of 0.450-0.650 μm in the visible light at the shortest focal length according to the first embodiment of the present invention;
fig. 4 is a defocus graph of 0.450-0.650 μm in visible light at the shortest focal length according to the first embodiment of the present invention;
fig. 5 is an MTF graph of infrared 850nm at the shortest focal length according to the first embodiment of the present invention;
fig. 6 is a defocus graph of 850nm infrared rays at the shortest focal length according to the first embodiment of the present invention;
fig. 7 is a graph of lateral chromatic aberration at the shortest focal length according to the first embodiment of the present invention;
fig. 8 is a schematic view of longitudinal aberration at the shortest focal length according to the first embodiment of the present invention;
fig. 9 is a graph of MTF of 0.450-0.650 μm in the visible light at the longest focal length according to the first embodiment of the present invention;
fig. 10 is a defocus graph of 0.450-0.650 μm in visible light at the longest focal length according to the first embodiment of the present invention;
fig. 11 is an MTF graph of infrared 850nm at the longest focal length according to the first embodiment of the present invention;
fig. 12 is a defocus graph of 850nm infrared rays at the longest focal length according to the first embodiment of the present invention;
fig. 13 is a graph of lateral chromatic aberration at the longest focal length according to the first embodiment of the present invention;
fig. 14 is a diagram illustrating longitudinal aberrations at the longest focal length according to the first embodiment of the present invention;
fig. 15 is a schematic structural view of the second embodiment of the present invention at the shortest focal length;
fig. 16 is a schematic structural view of the second embodiment of the present invention at the longest focal length;
fig. 17 is an MTF graph of 0.450 to 0.650 μm in visible light at the shortest focal length according to embodiment two of the present invention;
fig. 18 is a defocus graph of 0.450-0.650 μm in visible light at the shortest focal length according to the second embodiment of the present invention;
fig. 19 is an MTF graph of infrared 850nm at the shortest focal length according to the second embodiment of the present invention;
fig. 20 is a defocus graph of 850nm infrared rays at the shortest focal length according to the second embodiment of the present invention;
fig. 21 is a lateral chromatic aberration curve diagram of the second embodiment of the present invention at the shortest focal length;
fig. 22 is a schematic view of longitudinal aberration at the shortest focal length according to the second embodiment of the present invention;
fig. 23 is an MTF graph of 0.450 to 0.656 μm in visible light at the longest focal length according to embodiment two of the present invention;
fig. 24 is a defocus graph of 0.450 to 0.656 μm in visible light at the longest focal length according to embodiment two of the present invention;
fig. 25 is an MTF graph of infrared 850nm at the longest focal length according to the second embodiment of the present invention;
fig. 26 is a defocus graph of 850nm infrared rays at the longest focal length according to the second embodiment of the present invention;
fig. 27 is a lateral chromatic aberration curve diagram of the second embodiment of the present invention at the longest focal length;
fig. 28 is a schematic view of longitudinal aberration at the longest focal length according to the second embodiment of the present invention;
fig. 29 is a schematic structural view of the third embodiment of the present invention at the shortest focal length;
fig. 30 is a schematic structural view of the third embodiment of the present invention at the longest focal length;
fig. 31 is an MTF graph of 0.450 to 0.650 μm in visible light at the shortest focal length according to the third embodiment of the present invention;
fig. 32 is a defocus graph of 0.450-0.650 μm in visible light at the shortest focal length according to the third embodiment of the present invention;
fig. 33 is an MTF graph of infrared 850nm at the shortest focal length according to the third embodiment of the present invention;
fig. 34 is a defocus graph of 850nm infrared rays at the shortest focal length according to the third embodiment of the present invention;
fig. 35 is a lateral chromatic aberration curve diagram of the third embodiment of the present invention at the shortest focal length;
fig. 36 is a schematic view of longitudinal aberration at the shortest focal length according to the third embodiment of the present invention;
fig. 37 is an MTF graph of 0.450 to 0.656 μm in visible light at the longest focal length according to the third embodiment of the present invention;
fig. 38 is a defocus graph of 0.450 to 0.656 μm in visible light at the longest focal length according to the third embodiment of the present invention;
fig. 39 is an MTF graph of infrared 850nm at the longest focal length according to the third embodiment of the present invention;
fig. 40 is a defocus graph of 850nm infrared rays at the longest focal length according to the third embodiment of the present invention;
fig. 41 is a lateral chromatic aberration curve diagram of the third embodiment of the present invention at the longest focal length;
fig. 42 is a diagram illustrating longitudinal aberrations at the longest focal length according to the third embodiment of the present invention;
fig. 43 is a schematic structural view of the fourth embodiment of the present invention at the shortest focal length;
fig. 44 is a schematic structural view of the fourth embodiment of the present invention at the longest focal length;
fig. 45 is an MTF graph of 0.450 to 0.650 μm in visible light at the shortest focal length according to the fourth embodiment of the present invention;
fig. 46 is a defocus graph of 0.450-0.650 μm in visible light at the shortest focal length according to the fourth embodiment of the present invention;
fig. 47 is an MTF graph of infrared 850nm at the shortest focal length according to the fourth embodiment of the present invention;
fig. 48 is a defocus graph of 850nm infrared rays at the shortest focal length according to the fourth embodiment of the present invention;
fig. 49 is a graph of lateral chromatic aberration at the shortest focal length according to the fourth embodiment of the present invention;
fig. 50 is a schematic view of longitudinal aberration at the shortest focal length according to the fourth embodiment of the present invention;
fig. 51 is an MTF graph of 0.450 to 0.656 μm in visible light at the longest focal length according to embodiment four of the present invention;
fig. 52 is a defocus graph of 0.450-0.656 μm in visible light at the longest focal length according to the fourth embodiment of the present invention;
fig. 53 is an MTF graph of infrared 850nm at the longest focal length according to the fourth embodiment of the present invention;
fig. 54 is a defocus graph of 850nm infrared rays at the longest focal length according to the fourth embodiment of the present invention;
fig. 55 is a graph of lateral chromatic aberration at the longest focal length according to the fourth embodiment of the present invention;
fig. 56 is a diagram illustrating longitudinal aberrations at the longest focal length according to the fourth embodiment of the present invention.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The utility model provides a super small zoom includes first lens, second lens, third lens, fourth lens, diaphragm, fifth lens, sixth lens, seventh lens, eighth lens and ninth lens according to the preface by thing side to picture side.
The first lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a convex surface portion in a peripheral vicinity region, and the image-side surface has a concave surface portion in an optical axis vicinity region.
The second lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a concave portion in a peripheral vicinity region, and the image-side surface has a concave portion in an optical axis vicinity region.
The third lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a convex surface portion in a peripheral vicinity region, and the image-side surface has a concave surface portion in an optical axis vicinity region.
The fourth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a convex surface portion in a peripheral vicinity region, and the image-side surface has a concave surface portion in an optical axis vicinity region.
The fifth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a convex surface portion in a peripheral vicinity region, and the image-side surface has a concave surface portion in an optical axis vicinity region.
The sixth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a convex surface portion in a peripheral vicinity region, and the image-side surface has a convex surface portion in an optical axis vicinity region.
The seventh lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a concave portion in a peripheral vicinity region, and the image-side surface has a concave portion in an optical axis vicinity region.
The eighth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a convex surface portion in a peripheral vicinity region, and the image-side surface has a convex surface portion in an optical axis vicinity region.
The ninth lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface has a concave surface portion in a peripheral vicinity region, and the image-side surface has a convex surface portion in an optical axis vicinity region.
The first to fourth lenses constitute a focusing lens group; the fifth to ninth constitute a variable power lens group.
The utility model adopts nine lenses, and through the arrangement design of the refractive index and the surface type of each lens, the optical TTL is less than 33mm, the whole volume of the lens is small, and the manufacturing cost is low; the transfer function is well controlled, the resolution is high (2K), the resolution is high, the image sharpness is high, and the image is uniform; the focal length span is large, the field angle span is large, and the switching flexibility is strong; the switching piece is used for visible-infrared switching, the infrared imaging quality is improved, and the like.
Preferably, the ultra-small zoom lens further satisfies: the third lens and the fourth lens are veneers, and | vd4-vd3| >30, wherein vd3 and vd4 are the abbe numbers of the third lens and the fourth lens respectively, which is beneficial to correcting chromatic aberration.
Preferably, the ultra-small zoom lens further satisfies: the sixth lens and the seventh lens are veneers, and | vd7-vd6| >30, wherein vd6 and vd7 are the abbe numbers of the sixth lens and the seventh lens respectively, which is beneficial to correcting chromatic aberration.
Preferably, the ultra-small zoom lens further satisfies: the third lens and the ninth lens are designed to be 16-order even-order plastic aspheric surfaces, so that the second-order spectrum and high-order aberration are corrected, the structural design of the lens is facilitated, and the cost of the lens is reduced.
Preferably, the ultra-small zoom lens further satisfies: and the nd1 is 1.835, the nd7 is 1.847, and the first lens and the seventh lens are made of high-refractive-index materials, so that the optical structure can be optimized well.
Preferably, the ultra-small zoom lens further satisfies: and vd2 is 58.35, vd3 is 59.51, vd6 is 51.16, and the second lens, the third lens and the sixth lens are all made of materials with larger dispersion coefficients, so that the chromatic dispersion of light is reduced, and the chromatic aberration is optimized.
Preferably, the lens in the design adopts a visible-infrared switching sheet design, visible and infrared imaging quality is considered, and the overall imaging quality is improved.
The zoom lens of the present invention will be described in detail with specific embodiments.
Implement one
As shown in fig. 1 and 2, a super-small zoom lens includes, in order along an optical axis I, a first lens 1 to a fourth lens 4, a stop 10, a fifth lens 5 to a ninth lens 9, a cover glass 100, and an image plane 1000 from an object side a1 to an image side a 2; the first lens element 1 to the ninth lens element 9 each include an object-side surface facing the object side a1 and passing the imaging light rays, and an image-side surface facing the image side a2 and passing the imaging light rays.
The first lens element 1 has a negative refractive index, the object-side surface 11 of the first lens element 1 is a convex surface, and the image-side surface 12 of the first lens element 1 is a concave surface; the second lens element 2 has a negative refractive index, the object-side surface 21 of the second lens element 2 is concave, and the image-side surface 22 of the second lens element 2 is concave; the third lens element 3 has a negative refractive index, the object-side surface 31 of the third lens element 3 is convex, and the image-side surface 32 of the third lens element 3 is convex; the fourth lens element 4 with positive refractive index has a convex object-side surface 41 of the fourth lens element 4 and a convex image-side surface 42 of the fourth lens element 4; the first to fourth lenses 1 to 4 constitute a focusing lens group movable back and forth along the optical axis I with respect to the diaphragm 10.
The fifth lens element 5 with positive refractive index has a convex object-side surface 51 of the fifth lens element 5 and a concave image-side surface 52 of the fifth lens element 5; the sixth lens element 6 with positive refractive index has a convex object-side surface 61 of the sixth lens element 6 and a convex image-side surface 62 of the sixth lens element 6; the seventh lens element 7 has a negative refractive index, and an object-side surface 71 of the seventh lens element 7 is concave and an image-side surface 72 of the seventh lens element 7 is concave; the eighth lens element 8 with positive refractive index has a convex object-side surface 81 of the eighth lens element 8 and a convex image-side surface 82 of the eighth lens element 8; the ninth lens element 9 has a negative refractive index, and an object-side surface 91 of the ninth lens element 9 is convex and an image-side surface 92 of the ninth lens element 9 is convex. The fifth lens 5 to the ninth lens 9 constitute a variable power lens group that can move back and forth along the optical axis I with respect to the stop 10.
In this embodiment, a combination of seven glass sheets and two plastic aspheric surfaces is used, which includes 2 sets of double-cemented lenses, the first lens 1 to the fourth lens 4 are front sets of the lens, the fifth lens 5 to the ninth lens 9 are rear sets of the lens, the third lens and the fourth lens are cemented lenses, the sixth lens and the seventh lens are cemented lenses, the fifth lens and the ninth lens are plastic aspheric lenses, and the stop 10 is located between the fourth lens and the fifth lens.
Detailed optical data at the shortest focal length (wide angle) of this embodiment are shown in table 1-1.
TABLE 1-1 detailed optical data at shortest focal length of example one
Detailed optical data at the longest focal length (tele) of this embodiment are shown in tables 1-2.
TABLE 1-2 detailed optical data at longest focal length of example one
In this embodiment, the object- side surfaces 31 and 91 and the image- side surfaces 32 and 92 are defined by the following aspheric curve formulas:
wherein:
z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);
c: curvature of aspheric vertex (the vertex curvature);
k: cone coefficient (Conic Constant);
rn: normalized radius (normalysis radius (NRADIUS));
u：r/rn；
am: mth order QconCoefficient (is the m)thQconcoefficient)；
Qm con: mth order QconPolynomial (the m)thQconpolynomial)。
Referring to fig. 3-14, specifically, referring to fig. 3 and 5, it can be seen from the graphs that the transfer function is well controlled, the resolution is low, the MTF value of 200lp/mm spatial frequency is as low as 0.25 in the wide angle environment and is even lower than 0.1 in the telephoto environment; under the infrared environment and under the space frequency of 200lp/mm, MTF values are all larger than 0.18, and shooting noise is less; as shown in fig. 4 and 6, the confocal performance of visible light and infrared 850nm is good, the defocusing amount during visible and infrared switching is less than 4 μm at a wide angle, and the defocusing amount during visible and infrared switching is less than 10 μm at a long focus; the transverse chromatic aberration is shown in detail in fig. 7 and fig. 13, and it can be seen that the transverse chromatic aberration is less than +/-0.005 mm; the longitudinal aberration diagrams are shown in detail in fig. 8 and 14, and it can be seen that the chromatic aberration in the transverse axis is small.
In this embodiment, TTL <32.3mm, and the focal length range is between 3.15mm-8.0 mm.
Example two
As shown in fig. 15 and 16, in this embodiment, the surface-type convexo-concave and the refractive index of each lens element are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.
Detailed optical data at the shortest focal length (wide angle) of this embodiment are shown in table 2-1.
TABLE 2-1 detailed optical data at shortest focal Length for example two
Detailed optical data at the longest focal length (tele) of this embodiment are shown in table 2-2.
TABLE 2-2 detailed optical data at longest focal Length for example two
Please refer to fig. 17-28 for the resolution of the present embodiment, specifically, refer to fig. 17 and fig. 19, which show that the transfer function is well controlled, the resolution is low, the MTF value of 200lp/mm spatial frequency is as low as 0.25 in the wide angle environment, and the MTF value of 200lp/mm spatial frequency is even lower than 0.1 in the telephoto environment; under the infrared environment and under the space frequency of 200lp/mm, MTF values are all larger than 0.18, and shooting noise is less; as shown in fig. 18 and 20, the confocal performance of visible light and infrared light of 850nm is good, the defocusing amount during visible and infrared switching is less than 4 μm at a wide angle, and the defocusing amount during visible and infrared switching is less than 10 μm at a telephoto; the transverse chromatic aberration is shown in detail in fig. 21 and 27, and it can be seen that the transverse chromatic aberration is less than ± 0.005 mm; the longitudinal aberration diagrams are shown in detail in fig. 22 and 28, and it can be seen that the chromatic aberration in the transverse axis is small.
In this embodiment, TTL <32.3mm, and the focal length range is between 3.14mm-8.0 mm.
EXAMPLE III
As shown in fig. 29 and 30, the lens elements of this embodiment have the same surface type convexo-concave and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.
Detailed optical data at the shortest focal length (wide angle) of this embodiment are shown in table 3-1.
TABLE 3-1 detailed optical data at shortest focal length for example III
The detailed optical data at the longest focal length (tele) of this embodiment is shown in table 3-2.
TABLE 3-2 detailed optical data at longest focal length for example III
Please refer to fig. 31-42 for the resolution of the present embodiment, specifically, refer to fig. 31 and 33, which show that the transfer function is well controlled, the resolution is low, the MTF value of 200lp/mm spatial frequency is as low as 0.28 in the wide angle environment and is even lower than 0.1 in the telephoto environment; under the infrared environment and under the space frequency of 200lp/mm, MTF values are all larger than 0.18, and shooting noise is less; as shown in fig. 32 and 34, the confocal performance of visible light and infrared light of 850nm is good, the defocus amount at the time of visible light and infrared light switching is less than 4 μm at a wide angle, and the defocus amount at the time of visible light and infrared light switching is less than 10 μm at a telephoto; the transverse chromatic aberration is shown in detail in fig. 35 and fig. 41, and it can be seen that the transverse chromatic aberration is less than ± 0.005 mm; the longitudinal aberration diagrams are shown in fig. 36 and 42 in detail, and it can be seen that the chromatic aberration in the transverse axis is small.
In this embodiment, TTL <32.5mm, and the focal length range is between 3.14mm-8.0 mm.
Example four
As shown in fig. 43 and 44, the lens of this embodiment has the same surface type convexo-concave and refractive index as the lens of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
Detailed optical data at the shortest focal length (wide angle) of this embodiment is shown in table 4-1.
TABLE 4-1 detailed optical data at shortest focal length for example four
The detailed optical data at the longest focal length (tele) of this embodiment is shown in table 4-2.
TABLE 4-2 detailed optical data at longest focal length for example four
Please refer to fig. 45-56 for the resolution of the present embodiment, specifically, refer to fig. 45 and 47, which show that the transfer function is well controlled, the resolution is low, the MTF value of 200lp/mm spatial frequency is as low as 0.28 in the wide angle environment and is even lower than 0.1 in the telephoto environment; under the infrared environment and under the space frequency of 200lp/mm, MTF values are all larger than 0.18, and shooting noise is less; as shown in fig. 46 and 48, the confocal performance of visible light and infrared 850nm is good, the defocusing amount during visible and infrared switching is less than 4 μm at a wide angle, and the defocusing amount during visible and infrared switching is less than 10 μm at a telephoto; the transverse chromatic aberration is shown in detail in fig. 49 and 56, and it can be seen that the transverse chromatic aberration is less than ± 0.005 mm; the longitudinal aberration diagrams are shown in detail in fig. 50 and 56, and it can be seen that the chromatic aberration in the transverse axis is small.
In this embodiment, TTL <32.7mm, and the focal length range is between 3.15mm-8.0 mm.
The foregoing is merely a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, as long as the technical effects of the present invention are achieved by the same means, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present disclosure should be included within the scope of the present disclosure. All belong to the protection scope of the utility model. The technical solution and/or the embodiments of the invention may be subject to various modifications and variations within the scope of the invention.
Claims (8)
1. A zoom lens with super-small size is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a diaphragm, 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;
the first lens element with negative refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is concave;
the second lens element with negative refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is concave and the image-side surface is concave;
the third lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is concave;
the fourth lens element with positive refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is convex;
the fifth lens element with positive refractive index has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is concave;
the sixth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is convex;
the seventh lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is concave and the image-side surface is concave;
the eighth lens element with positive refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is convex and the image-side surface is convex;
the ninth lens element with negative refractive power has an object-side surface facing the object side and an image-side surface facing the image side, wherein the object-side surface is concave and the image-side surface is convex;
the first to fourth lenses constitute a focusing lens group; fifth to ninth constitute a variable power lens group; the third lens and the ninth lens are both aspheric lenses;
the ultra-small zoom lens adopts a glass-plastic mixed 9-piece design, and only the nine lenses with the refractive index are provided.
2. The ultra-small zoom lens according to claim 1, further satisfying: the third lens and the fourth lens are mutually glued.
3. The ultra-small zoom lens according to claim 1, further satisfying: the sixth lens and the seventh lens are cemented to each other.
4. The ultra-small zoom lens according to claim 1, further satisfying: and | vd4-vd3| >30, wherein vd3 and vd4 are the abbe numbers of the third lens and the fourth lens respectively.
5. The ultra-small zoom lens according to claim 1, further satisfying: and | vd7-vd6| >30, wherein vd6 and vd7 are the abbe numbers of the sixth lens and the seventh lens, respectively.
6. The ultra-small zoom lens according to claim 1, further satisfying: the third lens and the ninth lens are designed to be 16-order even-order plastic aspheric surfaces.
7. The ultra-small zoom lens according to claim 1, further satisfying: the first lens and the seventh lens are made of high-refractive-index materials, and nd1 is 1.835, and nd7 is 1.847, wherein nd1 is the refractive index of the first lens, and nd7 is the refractive index of the seventh lens.
8. The ultra-small zoom lens according to claim 1, further satisfying: the second lens, the third lens and the sixth lens are made of materials with larger dispersion coefficients, wherein vd 2-58.35, vd 3-59.51, vd 6-51.16, and vd2, vd3 and vd6 are the dispersion coefficients of the second lens, the third lens and the sixth lens respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020261695.XU CN211402913U (en) | 2020-03-06 | 2020-03-06 | Ultra-small zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020261695.XU CN211402913U (en) | 2020-03-06 | 2020-03-06 | Ultra-small zoom lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175953A (en) * | 2020-03-06 | 2020-05-19 | 厦门力鼎光电股份有限公司 | Ultra-small zoom lens |
| WO2022077600A1 (en) * | 2020-10-14 | 2022-04-21 | 诚瑞光学(深圳)有限公司 | Optical camera lens |
-
2020
- 2020-03-06 CN CN202020261695.XU patent/CN211402913U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175953A (en) * | 2020-03-06 | 2020-05-19 | 厦门力鼎光电股份有限公司 | Ultra-small zoom lens |
| WO2022077600A1 (en) * | 2020-10-14 | 2022-04-21 | 诚瑞光学(深圳)有限公司 | Optical camera lens |
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