Projection lens, projection system and electronic device

Abstract

The present disclosure relates to the field of optical technology, and particularly relates to a projection lens, a projection system and an electronic device. The projection lens of the present disclosure comprises a first lens group, an aperture stop and a second lens group arranged in sequence along an optical axis from a projection surface to an image source surface; the first lens group has a negative focal power, and the second lens group has a positive focal power; the first lens group is composed of a first lens sheet, a first sub-lens group and a pre-stop lens arranged in sequence along the optical axis from the projection surface to the image source surface; the first sub-lens group comprises at least one lens sheet with a negative focal power; the first lens sheet and the pre-stop lens respectively have a positive focal power, and the first sub-lens group has a negative focal power; the second lens group is composed of a post-stop lens and a second sub-lens group arranged in sequence along the optical axis from the projection surface to the image source surface; the second sub-lens group has a positive focal power and comprises a group of cemented lenses with a positive focal power, and the post-stop lens has a negative focal power. The focusing range of the projection lens is greater than or equal to 500 mm.

Description

Technical Field

[0001] This disclosure relates to the field of optical technology, and in particular to a projection lens, projection system and electronic device. Background Technology

[0002] In the field of machine vision, a specified optical pattern is projected onto a target object using a projection system. A camera captures the distortion pattern of the corresponding optical pattern after it passes through the target object. By analyzing the deformation of the pattern, the three-dimensional shape and surface texture of the object can be determined.

[0003] The projection lens of the projection system and the imaging lens of the camera together constitute the core optical module of machine vision inspection, and their optical performance directly affects image quality and inspection accuracy. The resolution, distortion, and imaging uniformity of the projection lens are key performance parameters that ensure accurate projection of structured light patterns.

[0004] Therefore, it is necessary to provide a projection lens that can clearly project patterns over a large focusing range. Utility Model Content

[0005] This disclosure provides a projection lens, projection system, and electronic device capable of clearly projecting patterns over a large focusing range.

[0006] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0007] The first aspect of this disclosure provides a projection lens, comprising: a first lens group, an aperture stop, and a second lens group arranged sequentially along an optical axis from a projection surface to an image source surface; wherein the projection surface is used to display a projected image; and the image source surface is used to display an image to be projected.

[0008] The first lens group has negative optical power, and the second lens group has positive optical power;

[0009] The first lens group consists of a first lens, a first sub-lens group, and a front aperture lens arranged sequentially along the optical axis from the projection surface to the image source surface; the first sub-lens group includes at least one lens with negative optical power; wherein, the first lens has positive optical power, the first sub-lens group has negative optical power, and the front aperture lens has positive optical power.

[0010] The second lens group consists of an aperture rear lens and a second sub-lens group arranged sequentially along the optical axis from the projection surface to the image source surface; the second sub-lens group includes a set of cemented lenses with positive optical power, the second sub-lens group has positive optical power, and the aperture rear lens has negative optical power;

[0011] The focusing range of the projection lens is greater than or equal to 500mm;

[0012] The distortion curve of the projection lens exhibits a monotonic variation across the entire field of view;

[0013] The contrast ratio of the MTF of each field of view of the projection lens is greater than 0.7 at a spatial frequency of 93 cycles / mm.

[0014] The relative illumination of the projection lens across the entire field of view is greater than 96%.

[0015] Compared with the prior art, the projection lens provided by the first aspect of this disclosure has the following advantages:

[0016] The projection lens disclosed herein has a negative optical power of the first lens group and a positive optical power of the second lens group, forming a "negative-positive" optical power structure. The first lens group causes light to diverge, expands the field of view, reduces the curvature of the image plane, and makes the aberration change gradually at different object distances. The second lens group causes light to converge, compensates for the divergence effect of the first group, ensures that the sensitivity of the image plane position to changes with the object distance is reduced, and enables the projection lens to adapt to a larger focusing range.

[0017] The aperture stop is located between the two sets of lenses to balance the contribution of aberrations before and after focusing, reducing astigmatism and field curvature changes during focusing.

[0018] The cemented lens (positive power) of the second sub-lens group corrects axial chromatic aberration, preventing different wavelengths of light from separating due to changes in object distance, and maintaining color consistency across the entire focusing range.

[0019] The combination of the first sub-lens group (negative optical power) and the front lens of the aperture stop (positive optical power) can correct field curvature and distortion, and reduce image plane drift during focusing.

[0020] The first lens has positive optical power, converges light, and controls the projection angle. It works in conjunction with the first sub-lens group with negative optical power within the first lens group to counteract image curvature, ensuring that the edges and center of the screen are clear at the same time, and that the image surface remains flat at different object distances (projection distances).

[0021] The projection lens of this embodiment has high resolution and high uniformity within a focusing range of 500mm or more, enabling clear imaging.

[0022] As an improvement to the projection lens described above, the projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the projection surface to the image source surface.

[0023] The aperture stop is located between the fifth lens and the sixth lens, the fifth lens being the front lens of the aperture stop and the sixth lens being the rear lens of the aperture stop;

[0024] The second lens, the third lens, and the fourth lens form the first sub-lens group;

[0025] The seventh and eighth lenses are cemented lenses; the seventh, eighth, ninth, and tenth lenses form the second sub-lens group;

[0026] The second lens, the third lens, and the fourth lens each have negative optical power; the seventh lens has negative optical power; and the eighth lens, the ninth lens, and the tenth lens each have positive optical power.

[0027] As an improvement to the projection lens disclosed herein, the first lens, the second lens, the third lens, and the fourth lens are convex and concave lenses respectively; the fifth lens is a biconvex lens; the sixth lens is a convex and concave lens; the seventh lens is a plano-concave lens; and the eighth, ninth, and tenth lenses are biconvex lenses respectively.

[0028] As an improvement to the projection lens disclosed herein, the radius of curvature R011 of the projection-side surface of the first lens is 20.8 mm to 33.8 mm, and the radius of curvature R012 of the image-source-side surface is 49 mm to 73.5 mm; the radius of curvature R021 of the projection-side surface of the second lens is 11.9 mm to 19.6 mm, and the radius of curvature R022 of the image-source-side surface is 6.3 mm to 11.6 mm; the radius of curvature R031 of the projection-side surface of the third lens is... The fourth lens has a projection-side surface curvature radius R032 of 6.54mm to 10.7mm, ranging from 19.3mm to 26.5mm; the projection-side surface curvature radius R041 of the fourth lens is 16.57mm to 425mm, and the image source-side surface curvature radius R042 is 6.76mm to 13.4mm; the projection-side surface curvature radius R051 of the fifth lens is 15mm to 32.7mm, and the image source-side surface curvature radius R052 is -83.3mm to -57mm. The radius of curvature R061 of the projection-side surface of the sixth lens is 77.4 mm to 209 mm, and the radius of curvature R062 of the image-source-side surface is 14.6 mm to 29 mm; the radius of curvature R071 of the projection-side surface of the seventh lens is greater than or equal to 566 mm, and the radius of curvature R072 of the image-source-side surface is 11.65 mm to 23.2 mm; the radius of curvature R081 of the projection-side surface of the eighth lens is 11.65 mm to 23.2 mm. The radius of curvature R082 of the image source side surface is -23.5mm to -11.65mm; the radius of curvature R091 of the projection side surface of the ninth lens is 31.1mm to 63.5mm, and the radius of curvature R092 of the image source side surface is -47.3mm to -31.1mm; the radius of curvature R0101 of the projection side surface of the tenth lens is 17.4mm to 29.8mm, and the radius of curvature R0102 of the image source side surface is -55.5mm to -26.4mm.

[0029] As an improvement to the projection lens disclosed herein, the center thickness GT01 of the first lens is 2.8mm to 5mm; the center thickness GT02 of the second lens is 1.64mm to 2.9mm; the center thickness GT03 of the third lens is 1.64mm to 2.9mm; the center thickness GT04 of the fourth lens is 1.49mm to 2.7mm; the center thickness GT05 of the fifth lens is 1.51mm to 2.7mm; the center thickness GT06 of the sixth lens is 1.5mm to 2.7mm; the center thickness GT07 of the seventh lens is 1.5mm to 2.7mm; the center thickness GT08 of the eighth lens is 3mm to 4.8mm; the center thickness GT09 of the ninth lens is 2mm to 3.7mm; and the center thickness GT010 of the tenth lens is 2.7mm to 4.8mm.

[0030] As an improvement to the projection lens disclosed herein, the air gap distance AT01 between the first lens and the second lens along the optical axis is 0.15mm to 0.27mm; the air gap distance AT02 between the second lens and the third lens along the optical axis is 2.7mm to 3.6mm; the air gap distance AT03 between the third lens and the fourth lens along the optical axis is 2.1mm to 3.8mm; the air gap distance AT04 between the fourth lens and the fifth lens along the optical axis is 4.4mm to 8mm; and the air gap distance between the fifth lens and the aperture stop along the optical axis is... The distance AT05 is 1.6mm to 3.1mm; the air gap AT06 between the aperture stop and the sixth lens along the optical axis is 1mm to 3.3mm; the air gap AT07 between the sixth lens and the seventh lens along the optical axis is 0.69mm to 1.2mm; the seventh lens and the eighth lens are cemented lenses; the air gap AT08 between the eighth lens and the ninth lens along the optical axis is 0.2mm to 0.27mm; the air gap AT09 between the ninth lens and the tenth lens along the optical axis is 0.2mm to 0.27mm.

[0031] As an improvement to the projection lens disclosed herein, the focal length f01 of the first lens is 44mm to 77mm; the focal length f02 of the second lens is -40mm to -20mm; the focal length f03 of the third lens is -38mm to -16mm; the focal length f04 of the fourth lens is -30mm to -23mm; the focal length f05 of the fifth lens is 13.5mm to 25mm; the focal length f06 of the sixth lens is -46mm to -20.4mm; the focal length f07 of the seventh lens is -25mm to -13mm; the focal length f08 of the eighth lens is 10.2mm to 21mm; the focal length f09 of the ninth lens is 20.5mm to 34mm; and the focal length f010 of the tenth lens is 17mm to 30mm.

[0032] As an improvement to the projection lens disclosed herein, the first lens has a refractive index NO1 of 1.73–1.75 and an Abbe number V01 of 52.3; the second lens has a refractive index NO2 of 1.75–1.81 and an Abbe number V02 of 46.2–52.3; the third lens has a refractive index NO3 of 1.64–1.71 and an Abbe number V03 of 54.8–60; the fourth lens has a refractive index NO4 of 1.50–1.52 and an Abbe number V04 of 64.2–81.6; and the fifth lens has a refractive index NO5 of 1.85–1.91 and an Abbe number V01 of 52.3. The refractive index of the sixth lens is 23.8–27; the refractive index of the seventh lens is 1.72–1.85, and the Abbe number of the eighth lens is 68.3–68.8; the refractive index of the ninth lens is 1.75–1.78, and the Abbe number of the tenth lens is 52.3; the refractive index of the tenth lens is 1.62, and the Abbe number of the tenth lens is 60.3.

[0033] As an improvement to the projection lens disclosed herein, the effective focal length fp of the projection lens is 5mm to 10mm, the aperture number Fno1 is F / 1.7 to F / 4, the image target size IMG1 is 6mm to 11mm, the working wavelength is 435nm to 680nm, the total optical length TTL1 of the projection lens is 46mm to 82mm, and the back focal length BFL1 is 13.5mm to 24mm.

[0034] As an improvement to the projection lens described above, the focal length fa1 of the first lens group is -240mm to -179mm, the focal length fb1 of the second lens group is 8.82mm to 160mm, and the focal length fc1 of the first sub-lens group is -40mm to -20mm.

[0035] The axial distance d012 between the first lens group and the second lens group is 2.7mm to 6.4mm.

[0036] As an improvement to the projection lens of the present disclosure, the focal length fa1 of the first lens group and the effective focal length fp of the projection lens satisfy |fa1 / fp|=19~35; the focal length fb1 of the second lens group and the effective focal length fp of the projection lens satisfy fb1 / fp=1.6~1.8.

[0037] The focal length fc1 of the first sub-lens group and the effective focal length fp of the projection lens satisfy |fc1 / fp|=4~4.5.

[0038] As an improvement to the projection lens disclosed herein, all lenses are made of glass and all lenses are spherical lenses.

[0039] A second aspect of this disclosure provides a projection system, comprising: a pattern generation module and a projection lens as described in any one aspect of the first aspect, wherein the pattern generation module generates a projection pattern, and the projection lens is used to project the projection pattern onto the surface of a test object.

[0040] The projection system provided in the second aspect of this disclosure, since it includes the projection lens described in the first aspect, also has the same advantages as the projection lens described in the first aspect.

[0041] A third aspect of this disclosure provides an electronic device, including: an imaging lens, an image sensor, and a projection system as described in the second aspect, the projection system being used to project a pattern toward the surface of a measured object;

[0042] The light reflected from the surface of the object being measured passes through the imaging lens and forms a detection image on the image sensor.

[0043] As an improvement to the electronic device described above, the imaging lens includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged coaxially from the object side to the image side; an aperture stop is provided between the seventh lens and the eighth lens;

[0044] The first lens has positive optical power; the second lens has negative optical power; the third lens has negative optical power; the fourth lens has negative optical power; the fifth lens has positive optical power; the sixth lens has positive optical power; the seventh lens has positive optical power; the eighth lens has positive optical power; the ninth lens has positive optical power; and the tenth and eleventh lenses each have negative optical power.

[0045] The first lens is a convex-concave lens, the second lens is a convex-concave lens, the first and second lenses are cemented lenses, the third lens is a convex-concave lens, the fourth lens is a biconcave lens, the fifth lens is a biconvex lens, the fourth and fifth lenses are cemented lenses, the sixth lens is a biconvex lens, the seventh lens is a biconvex lens, the eighth lens is a concave-convex lens, the ninth lens is a biconvex lens, the tenth lens is a biconvex lens, the eleventh lens is a concave-convex lens, and the tenth and eleventh lenses are cemented lenses; the effective focal length fi of the imaging lens is 8mm to 14mm, and the operating wavelength is 400nm to 700nm.

[0046] As an improvement to the aforementioned electronic device of this disclosure, the first lens has a refractive index N1 of 1.65–1.70 and an Abbe number V1 of 54.5–55; the second lens has a refractive index N2 of 1.50–1.55 and an Abbe number V2 of 52.0–52.5; the third lens has a refractive index N3 of 1.50–1.55 and an Abbe number V3 of 62.0–62.5; the fourth lens has a refractive index N4 of 1.85–1.90 and an Abbe number V4 of 23.5–24.0; the fifth lens has a refractive index N5 of 1.65–1.70 and an Abbe number V5 of 54.5–55.0; and the sixth lens has a refractive index N6 of… The refractive index of the seventh lens is 1.90–1.95, and the Abbe number V6 is 20.5–21.0; the refractive index of the eighth lens is 1.60–1.65, and the Abbe number V6 is 63.0–63.5; the refractive index of the ninth lens is 1.55–1.60, and the Abbe number is 68.0–68.5; the refractive index of the tenth lens is 1.55–1.60, and the Abbe number V10 is 68.0–68.5; the refractive index of the eleventh lens is 1.85–1.90, and the Abbe number V11 is 23.5–24.0.

[0047] As an improvement to the electronic device described in this disclosure, the first lens, the second lens, and the third lens form a front lens group;

[0048] The fourth lens, the fifth lens, the sixth lens, and the seventh lens form a lens group;

[0049] The eighth lens, the ninth lens, the tenth lens, and the eleventh lens form a rear lens group;

[0050] The front lens group has negative optical power; the middle lens group and the rear lens group each have positive optical power. As an improvement to the above-mentioned electronic device of this disclosure, the focal length fa2 of the front lens group is -30mm to -15mm;

[0051] The focal length fb2 of the middle lens group is 12mm to 27mm;

[0052] The focal length fc2 of the rear lens group is 15mm to 30mm;

[0053] The axial distance d12 between the front lens group and the middle lens group is 2mm to 7mm; the axial distance d23 between the middle lens group and the rear lens group is 6mm to 15mm.

[0054] As an improvement to the above-described electronic device of this disclosure, the focal length fa2 of the front lens group and the effective focal length fi of the imaging lens satisfy 1.95 < |fa2 / fi| < 1.96, the focal length fb2 of the middle lens group and the effective focal length fi of the imaging lens satisfy 1.74 < fb2 / fi < 1.75, and the focal length fc2 of the rear lens group and the effective focal length fi of the imaging lens satisfy 2.12 < fc2 / fi < 2.13.

[0055] The axial distance d12 between the front lens group and the middle lens group and the axial distance d23 between the middle lens group and the rear lens group satisfy 0.4 < d12 / d23 < 0.41.

[0056] As an improvement to the aforementioned electronic device of this disclosure, the radius of curvature R11 of the incident surface of the first lens is 16.1 mm to 23.4 mm, and the radius of curvature R12 of the exit surface is 87.7 mm to 126.8 mm; the radius of curvature R21 of the incident surface of the second lens is 87.7 mm to 126.8 mm, and the radius of curvature R22 of the exit surface is 6.9 mm to 10.0 mm; the radius of curvature R31 of the incident surface of the third lens is 13.8 mm to 20.1 mm, and the radius of curvature R22 of the exit surface is 6.9 mm to 10.0 mm. The radius of curvature R32 of the fourth lens is 7.1 mm to 10.4 mm; the radius of curvature R41 of the incident surface of the fourth lens is -11.6 mm to -8.0 mm, and the radius of curvature R42 of the exit surface is 35.6 mm to 51.5 mm; the radius of curvature R51 of the incident surface of the fifth lens is 35.6 mm to 51.5 mm, and the radius of curvature R52 of the exit surface is -15.3 mm to -10.5 mm; the radius of curvature R61 of the incident surface of the sixth lens is 49.7 mm to 71.9 mm. The radius of curvature R62 of the exit surface of the seventh lens is -78.0 mm to -53.9 mm; the radius of curvature R71 of the incident surface of the seventh lens is 35.8 mm to 51.9 mm, and the radius of curvature R72 of the exit surface is -354.1 mm to -245.1 mm; the radius of curvature R81 of the incident surface of the eighth lens is -61.2 mm to -42.3 mm, and the radius of curvature R82 of the exit surface is -23.4 mm to -16.1 mm; the radius of curvature R91 of the incident surface of the ninth lens is... The incident surface of the tenth lens has a radius of curvature of 71.1mm to 102.9mm, and the exit surface radius of curvature R92 is -41.0mm to -28.3mm; the incident surface radius of curvature R101 of the eleventh lens has a radius of curvature of -13.1mm to -9.0mm, and the exit surface radius of curvature R112 is -147.1mm to -101.8mm.

[0057] As an improvement to the above-described electronic device, the radius of curvature R11 of the incident surface of the first lens and the radius of curvature R22 of the exit surface of the second lens satisfy 1.6 < R11 / R22 < 3.4.

[0058] The radius of curvature R41 of the incident surface of the fourth lens and the radius of curvature R52 of the exit surface of the fifth lens satisfy 0.5 < R41 / R52 < 1.2.

[0059] The radius of curvature R101 of the incident surface of the tenth lens and the radius of curvature R112 of the exit surface of the eleventh lens satisfy 0.2 < |R101 / R112| < 0.5.

[0060] As an improvement to the aforementioned electronic device of this disclosure, the center thickness GT1 of the first lens is 3.5 mm to 5.1 mm; the center thickness GT2 of the second lens is 1.0 mm to 1.6 mm; the center thickness GT3 of the third lens is 2.4 mm to 3.5 mm; the center thickness GT4 of the fourth lens is 1.0 mm to 1.5 mm; the center thickness GT5 of the fifth lens is 4.5 mm to 6.6 mm; the center thickness GT6 of the sixth lens is 1.7 mm to 2.6 mm; the center thickness GT7 of the seventh lens is 1.6 mm to 2.4 mm; the center thickness GT8 of the eighth lens is 1.4 mm to 2.1 mm; the center thickness GT9 of the ninth lens is 1.4 mm to 2.2 mm; the center thickness GT10 of the tenth lens is 2.0 mm to 3.1 mm; and the center thickness GT11 of the eleventh lens is 1.0 mm to 1.5 mm.

[0061] As an improvement to the electronic device described above, the center thickness GT1 of the first lens and the center thickness GT2 of the second lens satisfy 2.1 < GT1 / GT2 < 5.1;

[0062] The center thickness GT4 of the fourth lens and the center thickness GT5 of the fifth lens satisfy 0.15 < GT4 / GT5 < 0.4;

[0063] The center thickness GT10 of the tenth lens and the center thickness GT11 of the eleventh lens satisfy 1.3 < GT10 / GT11 < 3.1.

[0064] As an improvement to the aforementioned electronic device of this disclosure, the first lens and the second lens are cemented lenses; the air gap distance AT1 between the second lens and the third lens along the optical axis is 2.48 mm to 3.59 mm; the air gap distance AT2 between the third lens and the fourth lens along the optical axis is 3.43 mm to 4.97 mm; the fourth lens and the fifth lens are cemented lenses; the air gap distance AT3 between the fifth lens and the sixth lens along the optical axis is 0.15 mm to 0.23 mm; the air gap distance AT4 between the sixth lens and the seventh lens along the optical axis is 0.07 mm to 0.11 mm; The air gap AT5 between the seventh lens and the aperture stop along the optical axis is 6.87 mm to 9.94 mm; the air gap AT6 between the aperture stop and the eighth lens along the optical axis is 1.68 mm to 2.43 mm; the air gap AT7 between the eighth lens and the ninth lens along the optical axis is 0.12 mm to 0.18 mm; the air gap AT8 between the ninth lens and the tenth lens along the optical axis is 0.25 mm to 0.37 mm; the tenth lens and the eleventh lens are cemented lenses; the air gap BFL between the eleventh lens and the image plane along the optical axis is 9.68 mm to 14.00 mm.

[0065] As an improvement to the above-mentioned electronic device disclosed herein, the air gap distance AT5 between the seventh lens and the aperture stop along the optical axis and the air gap distance AT6 between the aperture stop and the eighth lens along the optical axis satisfy 8.5 < AT5 + AT6 < 12.4.

[0066] The air gap distance BFL between the eleventh lens and the image plane along the optical axis satisfies 0.14 < BFL / TTL2 < 0.27 with respect to the total optical length TTL2 of the system.

[0067] As an improvement to the aforementioned electronic device of this disclosure, the focal length f1 of the first lens is 23.7mm to 34.4mm; the focal length f2 of the second lens is -18.4mm to -12.6mm; the focal length f3 of the third lens is -48.1mm to -33.2mm; the focal length f4 of the fourth lens is -12.4mm to -8.5mm; the focal length f5 of the fifth lens is 15.9mm to 23.1mm; and the sixth lens... The focal length of the seventh lens is f6, which is 26.4mm to 38.2mm; the focal length of the eighth lens is f7, which is 37.6mm to 54.5mm; the focal length of the ninth lens is f8, which is 40.6mm to 58.7mm; the focal length of the ninth lens is f9, which is 33.7mm to 48.8mm; the focal length of the tenth lens is f10, which is -122.3mm to -84.6mm; and the focal length of the eleventh lens is f11, which is -61.8mm to -42.7mm.

[0068] As an improvement to the aforementioned electronic device, the focal length f1 of the first lens satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; the focal length f2 of the second lens satisfies 0.9 < |f2 / fi| < 2.1 with respect to the effective focal length fi of the lens; the focal length f3 of the third lens satisfies 2.5 < |f3 / fi| < 5.4 with respect to the effective focal length fi of the lens; the focal length f4 of the fourth lens satisfies 0.6 < |f4 / fi| < 1.4 with respect to the effective focal length fi of the lens; the focal length f5 of the fifth lens satisfies 1.2 < f5 / fi < 2.5 with respect to the effective focal length fi of the lens; and the focal length f6 of the sixth ... and the focal length f6 of the sixth lens satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; and the focal length f1 of the third lens satisfies 1.8 < The effective focal lengths fi of the lenses satisfy 2.0 < f6 / fi < 4.2; the focal length f7 of the seventh lens satisfies 2.8 < f7 / fi < 6.1; the focal length f8 of the eighth lens satisfies 3.1 < f8 / fi < 6.6; the focal length f9 of the ninth lens satisfies 2.5 < f9 / fi < 5.5; the focal length f10 of the tenth lens satisfies 6.5 < |f10 / fi| < 1.4; and the focal length f11 of the eleventh lens satisfies 3.2 < |f11 / fi| < 6.9.

[0069] As an improvement to the above-mentioned electronic device disclosed herein, the aperture number Fno2 of the imaging lens is F2.0 to F8.0, the half field of view is 20° to 30°, the image target size IMG2 is 6mm to 12mm, and the total optical length TTL2 of the system is 46.7mm to 67.5mm.

[0070] The effective focal length fi of the imaging lens and the image-side target size IMG2 of the imaging lens satisfy the condition 0.85 < fi / IMG2 < 1.81.

[0071] As an improvement to the electronic device described above, the imaging lens has a field curvature of less than 20 μm and an optical distortion of less than 4.5% across the entire field of view.

[0072] The distortion curve of the imaging lens exhibits a monotonic variation across the entire field of view;

[0073] The imaging lens has a full-field relative illumination greater than 92%;

[0074] The imaging lens has a contrast ratio greater than 0.3 at a spatial frequency of 400 lp / mm with a full field of view MTF value.

[0075] The imaging lens has a contrast attenuation of zero at a spatial frequency of 800 lp / mm with a full field of view MTF value.

[0076] Within the entire operating band of the imaging lens, the offset of the transverse chromatic aberration is less than 2 μm and converges within the Airy disk.

[0077] Within the temperature range of -20℃ to 60℃, the contrast variation of the full-field MTF value of the imaging lens at a spatial frequency of 200 lp / mm is less than 0.05.

[0078] Within the temperature range of -20℃ to 60℃, the focal shift of the imaging lens changes by less than 0.005mm.

[0079] As an improvement to the electronic device described above, each lens of the imaging lens is a glass lens, and each lens of the imaging lens is a spherical lens.

[0080] The electronic device provided in the third aspect of this disclosure, since it includes the projection system described in the second aspect, also has the same advantages as the projection system described in the second aspect. Attached Figure Description

[0081] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments of this disclosure or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only a part of the embodiments of this disclosure. These drawings and text descriptions are not intended to limit the scope of the concept of this disclosure in any way, but to illustrate the concept of this disclosure to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0082] Figure 1 This is a schematic diagram of the projection system provided in an embodiment of the present disclosure;

[0083] Figure 2 A distortion diagram of a projection lens provided in an embodiment of this disclosure;

[0084] Figure 3 MTF curve of the projection lens provided in the embodiments of this disclosure;

[0085] Figure 4 A relative illumination curve of the projection lens provided in an embodiment of this disclosure;

[0086] Figure 5 This is a schematic diagram of the structure of an imaging lens provided in an embodiment of the present disclosure;

[0087] Figure 6 Field curvature diagram of the imaging lens provided in the embodiments of this disclosure;

[0088] Figure 7 A distortion diagram of an imaging lens provided in an embodiment of this disclosure;

[0089] Figure 8 MTF curve of the imaging lens provided in the embodiments of this disclosure, with a diffraction-limited schematic line;

[0090] Figure 9 MTF curve of the imaging lens provided in the embodiments of this disclosure;

[0091] Figure 10 MTF curve of the imaging lens provided in the embodiments of this disclosure when the contrast decays to 0;

[0092] Figure 11 A relative illumination curve of the imaging lens provided in the embodiments of this disclosure;

[0093] Figure 12 A transverse chromatic aberration diagram of an imaging lens provided in an embodiment of this disclosure;

[0094] Figure 13 MTF curve of the imaging lens at 20°C as provided in the embodiments of this disclosure;

[0095] Figure 14 MTF curve of the imaging lens provided in this embodiment of the present disclosure when focusing at -20°C;

[0096] Figure 15 MTF curve of the imaging lens at 60°C when focusing, as provided in the embodiments of this disclosure;

[0097] Figure 16 MTF curve of the imaging lens provided in this embodiment of the present disclosure in a defocused state when focusing at 20°C;

[0098] Figure 17 MTF curve of the imaging lens provided in this embodiment of the present disclosure in the defocus state when focusing at -20°C;

[0099] Figure 18 MTF curve of the imaging lens provided in this embodiment of the present disclosure in a defocused state when focusing at 60°C;

[0100] Figure 19 A dot diagram of the imaging lens provided in the embodiments of this disclosure. Detailed Implementation

[0101] With the continuous development of optical imaging technology, image processing technology, and computer technology, structured light 3D measurement technology has been widely used in industrial inspection, intelligent manufacturing, and 3D reconstruction. This type of technology has significant advantages such as high measurement accuracy, fast response speed, low system cost, and flexible adaptability, and is gradually becoming an important means of non-contact 3D measurement.

[0102] As application scenarios become more complex and measurement accuracy demands increase, structured light systems place higher performance requirements on projection lenses, especially in terms of image clarity, brightness uniformity, and optical distortion control.

[0103] In a structured light measurement system, the projection lens and the imaging lens together constitute the core optical module, and their optical performance directly affects the overall measurement accuracy and image quality of the system. Among them, the resolution, distortion control capability, and imaging uniformity of the projection lens are key parameters to ensure the accurate projection of the structured light pattern.

[0104] In related technologies, in order to achieve high-quality projection across the entire field of view, a combination of multiple lenses is used, which results in a complex overall structure, a large number of lenses, and problems such as large lens size, heavy weight, and high cost.

[0105] In view of this, embodiments of the present disclosure provide a projection lens that can produce clear images at a distance of 500mm or greater, while also having high resolution, high uniformity, and low distortion.

[0106] Furthermore, all lenses in the projection lens are made of glass and spherical lenses, reducing costs.

[0107] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0108] Example 1

[0109] Combination Figure 1 This disclosure provides a projection lens, which includes: a first lens group L01, an aperture stop ST1, and a second lens group L02 arranged sequentially along the optical axis from the projection surface to the image source surface 13; wherein, the projection surface is used to display the projected image; and the image source surface 13 is used to display the image to be projected.

[0110] The first lens group L01 has negative optical power, and the second lens group L02 has positive optical power;

[0111] The first lens group L01 consists of a first lens G01, a first sub-lens group L11, and a front aperture lens arranged sequentially along the optical axis from the projection plane to the image source plane 13; the first sub-lens group L11 includes at least one lens with negative optical power; wherein, the first lens G01 has positive optical power, the first sub-lens group L11 has negative optical power, and the front aperture lens has positive optical power.

[0112] The second lens group L02 consists of an aperture rear lens and a second sub-lens group L21 arranged sequentially along the optical axis from the projection plane to the image source plane 13; the second sub-lens group L21 includes a set of cemented lenses with positive optical power, the second sub-lens group L21 has positive optical power, and the aperture rear lens has negative optical power.

[0113] When the projection lens projects onto the surface of the target object, the surface of the target object serves as the surface receiving the projected image, i.e., the projection surface. Image source surface 13 is the plane of the microdisplay device in the projection system. The microdisplay device is used to generate structured light patterns; for example, it is a digital micromirror device (DMD) plane, a liquid crystal display (LCD) plane, etc. In this embodiment, a DMD is used to generate the structured light pattern, and image source surface 1312 is the plane of the DMD chip. Light is projected from image source surface 13 onto the projection surface.

[0114] Each lens group includes at least one lens. Each lens group may contain either a split lens or a cemented lens. The lenses within each lens group may be all spherical lenses, all aspherical lenses, or a combination of spherical and aspherical lenses.

[0115] The lens material is either colorless optical glass or optical plastic. Optical plastic is low-cost for mass production, easy to process into aspherical surfaces, and lightweight. Optical glass has stable mechanical and thermal properties, and chromatic aberration can be eliminated and image quality improved by combining different refractive indices and Abbe numbers. Industrial robots are used in diverse environments, requiring high environmental temperature stability.

[0116] In some embodiments, all lenses of the projection lens are made of glass, and all lenses are spherical lenses. Firstly, glass has higher transmittance and better image quality compared to plastic. Secondly, glass has far superior physical and chemical stability compared to plastic, making it better adaptable to various environments and extending its lifespan. Furthermore, spherical glass lenses are significantly cheaper than aspherical glass lenses.

[0117] The negative optical power of the first lens group L01 and the positive optical power of the second lens group L02 form a "negative-positive" optical power structure. The first lens group L01 causes light to diverge, expands the field of view, reduces the curvature of the image plane, and makes the aberration change gradually at different object distances. The second lens group L02 causes light to converge, compensates for the divergence effect of the first group, and ensures that the sensitivity of the image plane position to changes with the object distance is reduced, so that the projection lens can be adapted to a larger focusing range.

[0118] The aperture stop ST1 is located between the two lens groups to balance the contribution of aberrations before and after focusing, reducing astigmatism and field curvature changes during focusing.

[0119] The cemented lens (positive power) of the second sub-lens group L21 corrects axial chromatic aberration, preventing different wavelengths of light from separating due to changes in object distance and maintaining color consistency across the entire focusing range.

[0120] The combination of the first sub-lens group L11 (negative optical power) and the front lens of the aperture stop (positive optical power) can correct field curvature and distortion, and reduce image plane drift during focusing.

[0121] The first lens G01 has positive optical power, converges light, controls the projection angle, and cooperates with the first sub-lens group L11 with negative optical power in the first lens group L01 to counteract the curvature of the image plane, ensuring that the edges and center of the screen are clear at the same time, and that the image plane remains flat under different object distances (projection distances).

[0122] The first sub-lens group L11 may include multiple lenses with negative optical power. For example, the first sub-lens group L11 introduces a large amount of negative field curvature to compensate for the positive field curvature introduced by other lenses at different object distances, so as to maintain high and stable modulation transfer function performance.

[0123] With the above settings, the projection lens of this embodiment has high resolution and high uniformity over a large focusing range, enabling clear imaging.

[0124] In some embodiments of this disclosure, the projection lens includes a first lens G01, a second lens G02, a third lens G03, a fourth lens G04, a fifth lens G05, a sixth lens G06, a seventh lens G07, an eighth lens G08, a ninth lens G09, and a tenth lens G010 arranged sequentially along the optical axis from the projection surface to the image source surface 13.

[0125] The aperture stop ST1 is located between the fifth lens G05 and the sixth lens G06. The fifth lens G05 is the front lens of the aperture stop, and the sixth lens G06 is the rear lens of the aperture stop.

[0126] The second lens G02, the third lens G03, and the fourth lens G04 form the first sub-lens group L11;

[0127] The seventh lens G07 and the eighth lens G08 are cemented lenses; the seventh lens G07, the eighth lens G08, the ninth lens G09 and the tenth lens G010 form the second sub-lens group L21;

[0128] The second lens G02, the third lens G03, and the fourth lens G04 each have negative optical power; the seventh lens G07 has negative optical power; and the eighth lens G08, the ninth lens G09, and the tenth lens G010 each have positive optical power.

[0129] Continue to refer to Figure 1 An equivalent prism 11 and a cover glass 12 are also provided between the tenth lens G010 and the image source surface 13.

[0130] Through the above settings, combined with Figure 1 The diagram shows the structure of the projection lens. The projection lens of this embodiment has a simple structure and good lens manufacturability while ensuring the size and volume of the lens optical path.

[0131] In this embodiment, the first lens G01 has positive optical power and introduces a large negative distortion to compensate for the positive distortion produced by other lenses, thereby suppressing overall system distortion. The second, third, and fourth lenses G02 and G03 all have negative optical power, effectively converging large-angle incident rays from off-axis directions, allowing them to enter the optical system and thus compressing the overall optical path length, achieving smooth light transitions. The fifth lens G05 has positive optical power to adjust the direction of light propagation, allowing light to pass smoothly through the aperture stop ST1 located behind it. The sixth lens G06 has negative optical power, receiving the outgoing light from the aperture stop and making the light propagation trend smoother, thereby creating good lighting conditions for subsequent imaging. The seventh and eighth lenses G07 and G08 form a cemented lens group with overall positive optical power, sharing the optical power of subsequent lenses. The eighth lens G08 can be made of an optical material with a specific thermo-optical coefficient to compensate for thermal differences caused by changes in ambient temperature. The ninth lens G09 and the tenth lens G010 have positive optical power and distribute the degree of light refraction to converge the light onto the image plane.

[0132] In this disclosure, the last lens of the first lens group L01 and the last lens of the second lens group L02, namely the fifth lens G05 and the tenth lens G010, introduce a large amount of positive spherical aberration to compensate for the negative spherical aberration introduced by other lenses at different object distances, so as to maintain high and stable modulation transfer function (MTF) performance.

[0133] It should be noted that the functional descriptions of the lenses described above are based on the angle from which light enters from the first lens G01 and exits from the tenth lens G010, thus forming an image. In this embodiment of the present disclosure, the projection lens projects the image from the image source surface 13 through the tenth lens G010, sequentially to the first lens G01, and onto the projection surface.

[0134] In this embodiment, the first lens G01, the second lens G02, the third lens G03, and the fourth lens G04 are convex and concave lenses, respectively; the fifth lens G05 is a biconvex lens; the sixth lens G06 is a convex and concave lens; the seventh lens G07 is a plano-concave lens; and the eighth lens G08, the ninth lens G09, and the tenth lens G010 are biconvex lenses, respectively.

[0135] The effective focal length fp of the projection lens disclosed herein is 5mm to 10mm, the aperture number Fno1 is F / 1.7 to F / 4, the image target size IMG1 is 6mm to 11mm, the working wavelength is 435nm to 680nm, the total optical length TTL1 of the projection lens system is 46mm to 82mm, and the system back focal length BFL1 is 13.5mm to 24mm.

[0136] The focal length fa1 of the first lens group L01 is -240mm to -179mm, the focal length fb1 of the second lens group L02 is 8.82mm to 160mm, and the focal length fc1 of the first sub-lens group L11 is -40mm to -20mm.

[0137] The axial distance d012 between the first lens group L01 and the second lens group L02 is 2.7mm to 6.4mm.

[0138] The focal length fa1 of the first lens group L01 and the effective focal length fp of the projection lens satisfy |fa1 / fp|=19~35; the focal length fb1 of the second lens group L02 and the effective focal length fp of the projection lens satisfy fb1 / fp=1.6~1.8.

[0139] The focal length fc1 of the first sub-lens group L11 and the effective focal length fp of the projection lens satisfy |fc1 / fp|=4~4.5.

[0140] In this embodiment, the first lens G01 has a projection-side surface radius of curvature R011 of 20.8 mm to 33.8 mm and an image-source-side surface radius of curvature R012 of 49 mm to 73.5 mm; the second lens G02 has a projection-side surface radius of curvature R021 of 11.9 mm to 19.6 mm and an image-source-side surface radius of curvature R022 of 6.3 mm to 11.6 mm; and the third lens G03 has a projection-side surface radius of curvature R031 of 19.3 mm. The first lens, G04, has a projection-side surface radius of curvature R032 of 6.54mm to 10.7mm. The second lens, G04, has a projection-side surface radius of curvature R041 of 16.57mm to 425mm and an image source-side surface radius of curvature R042 of 6.76mm to 13.4mm. The third lens, G05, has a projection-side surface radius of curvature R051 of 15mm to 32.7mm and an image source-side surface radius of curvature R052 of -83.3mm to -57.6mm. The sixth lens G06 has a projection-side surface radius of curvature R061 of 77.4 mm to 209 mm and an image-source-side surface radius of curvature R062 of 14.6 mm to 29 mm. The seventh lens G07 has a projection-side surface radius of curvature R071 greater than or equal to 566 mm and an image-source-side surface radius of curvature R072 of 11.65 mm to 23.2 mm. The eighth lens G08 has a projection-side surface radius of curvature R081 of 11.65 mm to 23.2 mm. The radius of curvature R082 of the source-side surface is -23.5 mm to -11.65 mm; the radius of curvature R091 of the projection-side surface of the ninth lens G09 is 31.1 mm to 63.5 mm, and the radius of curvature R092 of the image source-side surface is -47.3 mm to -31.1 mm; the radius of curvature R0101 of the projection-side surface of the tenth lens G010 is 17.4 mm to 29.8 mm, and the radius of curvature R0102 of the image source-side surface is -55.5 mm to -26.4 mm.

[0141] Among them, the projection side surface faces the projection plane, and the image source side surface faces the image source plane 13.

[0142] In this embodiment, the center thickness GT01 of the first lens G01 is 2.8mm to 5mm; the center thickness GT02 of the second lens G02 is 1.64mm to 2.9mm; the center thickness GT03 of the third lens G03 is 1.64mm to 2.9mm; the center thickness GT04 of the fourth lens G04 is 1.49mm to 2.7mm; the center thickness GT05 of the fifth lens G05 is 1.51mm to 2.7mm; the center thickness GT06 of the sixth lens G06 is 1.5mm to 2.7mm; the center thickness GT07 of the seventh lens G07 is 1.5mm to 2.7mm; the center thickness GT08 of the eighth lens G08 is 3mm to 4.8mm; the center thickness GT09 of the ninth lens G09 is 2mm to 3.7mm; and the center thickness GT010 of the tenth lens G010 is 2.7mm to 4.8mm. The center thickness of the lens refers to the thickness of the lens along the optical axis at its center.

[0143] The center thickness GT011 of the equivalent prism 11 can be 12mm.

[0144] In this embodiment, the air gap AT01 between the first lens G01 and the second lens G02 along the optical axis is 0.15mm to 0.27mm; the air gap AT02 between the second lens G02 and the third lens G03 along the optical axis is 2.7mm to 3.6mm; the air gap AT03 between the third lens G03 and the fourth lens G04 along the optical axis is 2.1mm to 3.8mm; the air gap AT04 between the fourth lens G04 and the fifth lens G05 along the optical axis is 4.4mm to 8mm; and the air gap AT04 between the fifth lens G05 and the aperture stop ST1 along the optical axis is... 5 is 1.6mm to 3.1mm; the air gap AT06 between aperture stop ST1 and the sixth lens G06 along the optical axis is 1mm to 3.3mm; the air gap AT07 between the sixth lens G06 and the seventh lens G07 along the optical axis is 0.69mm to 1.2mm; the seventh lens G07 and the eighth lens G08 are cemented lenses; the air gap AT08 between the eighth lens G08 and the ninth lens G09 along the optical axis is 0.2mm to 0.27mm; the air gap AT09 between the ninth lens G09 and the tenth lens G010 along the optical axis is 0.2mm to 0.27mm.

[0145] Among them, the air gap between the tenth lens G010 and the equivalent prism 11 along the optical axis is 3mm to 5.5mm, and the distance between the equivalent prism 11 and the image source surface 13 along the optical axis is 2mm to 2.6mm. In this gap, there is a cover glass 12 with a center thickness of 1.1mm.

[0146] The air gap AT05 between the fifth lens G05 and the aperture stop ST1 along the optical axis and the air gap AT06 between the aperture stop ST1 and the sixth lens G06 along the optical axis satisfy AT04+AT05=2.7mm~6.4mm.

[0147] In this embodiment, the focal length f01 of the first lens G01 is 44mm to 77mm; the focal length f02 of the second lens G02 is -40mm to -20mm; the focal length f03 of the third lens G03 is -38mm to -16mm; the focal length f04 of the fourth lens G04 is -30mm to -23mm; the focal length f05 of the fifth lens G05 is 13.5mm to 25mm; the focal length f06 of the sixth lens G06 is -46mm to -20.4mm; the focal length f07 of the seventh lens G07 is -25mm to -13mm; the focal length f08 of the eighth lens G08 is 10.2mm to 21mm; the focal length f09 of the ninth lens G09 is 20.5mm to 34mm; and the focal length f010 of the tenth lens G010 is 17mm to 30mm.

[0148] In this embodiment, the first lens G01 has a refractive index NO1 of 1.73–1.75 and an Abbe number V01 of 52.3; the second lens G02 has a refractive index NO2 of 1.75–1.81 and an Abbe number V02 of 46.2–52.3; the third lens G03 has a refractive index NO3 of 1.64–1.71 and an Abbe number V03 of 54.8–60; the fourth lens G04 has a refractive index NO4 of 1.50–1.52 and an Abbe number V04 of 64.2–81.6; and the fifth lens G05 has a refractive index NO5 of 1.85–1.91 and an Abbe number V05 of 23. The refractive index of the sixth lens G06 is 1.72–1.85, and the Abbe number is 23.8–24.9; the refractive index of the seventh lens G07 is 1.85–1.91, and the Abbe number is 22.9–23.8; the refractive index of the eighth lens G08 is 1.57–1.59, and the Abbe number is 68.3–68.8; the refractive index of the ninth lens G09 is 1.75–1.78, and the Abbe number is 52.3; the refractive index of the tenth lens G010 is 1.62, and the Abbe number is 60.3. The refractive index of the equivalent prism 11 is 1.71, and the Abbe number is 53.8. The embodiments of this disclosure define the material properties of each lens by limiting its refractive index and Abbe number.

[0149] In this disclosure, each lens or lens group of the optical lens has its own unique functional focus. Through reasonable allocation of optical power and material matching, various aberrations are balanced and kept within a range that does not affect accuracy.

[0150] The following is combined with Figures 2 to 4 The performance of the projection lens in the embodiments of this disclosure is explained. Among them, Figure 2 A distortion diagram of a projection lens provided in an embodiment of this disclosure; Figure 3 MTF curve of the projection lens provided in the embodiments of this disclosure; Figure 4 A relative illumination curve of the projection lens provided in an embodiment of this disclosure.

[0151] exist Figure 2 In the distortion diagram, the vertical axis represents the field of view, and the horizontal axis represents the distortion value. Each curve represents the distortion value at different wavelengths within the operating band. Combined with... Figure 2 The distortion curve of the projection lens in this embodiment exhibits a monotonic variation across the entire field of view. Specifically, from the central field of view (0°) to the edge field of view (31.47°), the distortion gradually increases from 0 to 3%, showing a monotonic change. Compared to a non-monotonic distortion curve, a monotonic distortion curve helps simplify the correction process during 3D reconstruction, enabling the algorithm to more accurately compensate for distortion, reduce errors, achieve higher fitting accuracy, and ultimately achieve higher detection accuracy.

[0152] In some possible embodiments, the distortion of the projection lens is less than 3%, resulting in less full-frame distortion in the image.

[0153] like Figure 3 The MTF (Modulation Transfer Function) curve shown is plotted with spatial frequency on the horizontal axis (linear period / mm) and contrast on the vertical axis (range 0-1). Solid and dashed lines represent the meridional and sagittal components of the MTF at different fields of view. The solid line represents the meridional contrast component, perpendicular to the optical axis; the dashed line represents the sagittal contrast component, along the optical axis. Higher curves and closer together indicate higher image quality. Figure 3 The contrast ratio of the MTF in each field of view of the projection lens is greater than 0.7 at a spatial frequency of 93 cycles / mm, which enables high-resolution imaging, reduces image blur, makes the image clearer, and improves image quality.

[0154] Figure 4The relative illumination curve is shown on the horizontal axis, where the horizontal axis represents the field of view in mm. 0 mm represents the center field of view, and 4 mm represents the edge field of view. The vertical axis represents relative illumination, ranging from 0 to 1. The projection lens of this embodiment has a relative illumination of 100% in the center field of view and greater than 96% in the edge field of view. This higher relative illumination in the edge field of view ensures the uniformity of the overall image, preventing vignetting even at the edges. The difference between edge and center brightness is small, reducing the need for post-processing brightness correction.

[0155] The following are three specific examples of projection lenses.

[0156] Example 1

[0157] In this disclosed example, the effective focal length fp of the projection lens is 5mm, the aperture number Fno1 is F / 1.7, the image target size IMG1 is 6mm, the working wavelength is 435nm~680nm, the total optical length of the system TTL1 is 46mm, and the back focal length BFL1 of the system is 13.5mm.

[0158] The focal length fa1 of the first lens group L01 is -179mm, the focal length fb1 of the second lens group L02 is 8.82mm, and the focal length fc1 of the first sub-lens group L11 is -20mm. The axial distance d012 between the first lens group L01 and the second lens group L02 is 2.7mm.

[0159] The focal length fa1 of the first lens group L01 satisfies |fa1 / fp|=35 with the effective focal length fp of the projection lens; the focal length fb1 of the second lens group L02 satisfies fb1 / fp=1.7 with the effective focal length fp of the projection lens; and the focal length fc1 of the first sub-lens group L11 satisfies |fc1 / fp|=4 with the effective focal length fp of the projection lens.

[0160] The radii of curvature of each lens are as follows: Lens G01: Projection-side radius of curvature R011 is 20.8 mm, and image-source-side radius of curvature R012 is 49 mm; Lens G02: Projection-side radius of curvature R021 is 11.9 mm, and image-source-side radius of curvature R022 is 6.3 mm; Lens G03: Projection-side radius of curvature R031 is 19.8 mm, and image-source-side radius of curvature R032 is 6.54 mm; Lens G04: Projection-side radius of curvature R041 is 16.57 mm, and image-source-side radius of curvature R042 is 6.76 mm; Lens G05: Projection-side radius of curvature R051 is 15 mm, and image-source-side radius of curvature R052 is -57.6 mm. m; The radius of curvature R061 of the projection side surface of the sixth lens G06 is 77.4 mm, and the radius of curvature R062 of the image source side surface is 14.6 mm; The radius of curvature R071 of the projection side surface of the seventh lens G07 is infinite, and the radius of curvature R072 of the image source side surface is 11.65 mm; The radius of curvature R081 of the projection side surface of the eighth lens G08 is 11.65 mm, and the radius of curvature R082 of the image source side surface is -11.65 mm; The radius of curvature R091 of the projection side surface of the ninth lens G09 is 31.1 mm, and the radius of curvature R092 of the image source side surface is -31.1 mm; The radius of curvature R0101 of the projection side surface of the tenth lens G010 is 17.4 mm, and the radius of curvature R0102 of the image source side surface is -26.4 mm.

[0161] The center thicknesses of each lens are as follows: the center thickness GT01 of the first lens G01 is 2.8 mm; the center thickness GT02 of the second lens G02 is 1.64 mm; the center thickness GT03 of the third lens G03 is 1.64 mm; the center thickness GT04 of the fourth lens G04 is 1.49 mm; the center thickness GT05 of the fifth lens G05 is 1.51 mm; the center thickness GT06 of the sixth lens G06 is 1.5 mm; the center thickness GT07 of the seventh lens G07 is 1.5 mm; the center thickness GT08 of the eighth lens G08 is 3 mm; the center thickness GT09 of the ninth lens G09 is 2 mm; the center thickness GT010 of the tenth lens G010 is 2.7 mm; and the center thickness GT011 of the equivalent prism 11 is 12 mm.

[0162] The air gaps between the lenses are as follows: the air gap AT01 between the first lens G01 and the second lens G02 along the optical axis is 0.15 mm; the air gap AT02 between the second lens G02 and the third lens G03 along the optical axis is 2.7 mm; the air gap AT03 between the third lens G03 and the fourth lens G04 along the optical axis is 2.1 mm; the air gap AT04 between the fourth lens G04 and the fifth lens G05 along the optical axis is 4.4 mm; the air gap AT05 between the fifth lens G05 and the aperture stop along the optical axis is 1.6 mm; the air gap A between the aperture stop and the sixth lens G06 along the optical axis is... T06 is 1mm; the air gap AT07 between the sixth lens G06 and the seventh lens G07 along the optical axis is 0.69mm; the seventh lens G07 and the eighth lens G08 are cemented lenses; the air gap AT08 between the eighth lens G08 and the ninth lens G09 along the optical axis is 0.2mm; the air gap AT09 between the ninth lens G09 and the tenth lens G010 along the optical axis is 0.2mm; the air gap between the tenth lens G010 and the equivalent prism 11 along the optical axis is 3mm, and the distance between the equivalent prism 11 and the image plane 13 along the optical axis is 2.4mm. Among them, there is a cover glass 12 with a center thickness of 1.1mm.

[0163] The air gap AT05 between the fifth lens G05 and the aperture stop along the optical axis and the air gap AT06 between the aperture stop and the sixth lens G06 along the optical axis satisfy AT04 + AT05 = 2.7 mm.

[0164] The focal lengths of the lenses are as follows: the first lens G01 has a focal length of f01 of 44mm; the second lens G02 has a focal length of f02 of -20mm; the third lens G03 has a focal length of f03 of -16mm; the fourth lens G04 has a focal length of f04 of -23mm; the fifth lens G05 has a focal length of f05 of 13.5mm; the sixth lens G06 has a focal length of f06 of -20.4mm; the seventh lens G07 has a focal length of f07 of -13mm; the eighth lens G08 has a focal length of f08 of 10.2mm; the ninth lens G09 has a focal length of f09 of 20.5mm; and the tenth lens G010 has a focal length of f010 of 17mm.

[0165] The optical material parameters of each lens are as follows: Lens G01 has a refractive index (N01) of 1.73 and an Abbe number (V01) of 52.3; Lens G02 has a refractive index (N02) of 1.75 and an Abbe number (V02) of 52.3; Lens G03 has a refractive index (N03) of 1.64 and an Abbe number (V03) of 60; Lens G04 has a refractive index (N04) of 1.52 and an Abbe number (V04) of 64.2; Lens G05 has a refractive index (N05) of 1.85 and an Abbe number (V05) of 23.8; and Lens G06 has a refractive index (N01) of... The refractive index of the seventh lens G07 is 1.85, and the Abbe number V06 is 23.8; the refractive index of the eighth lens G08 is 1.59, and the Abbe number V08 is 68.3; the refractive index of the ninth lens G09 is 1.75, and the Abbe number V09 is 52.3; the refractive index of the tenth lens G010 is 1.62, and the Abbe number V010 is 60.3; the refractive index of the equivalent prism 11 is 1.71, and the Abbe number V010 is 53.8.

[0166] Example 2

[0167] In this disclosed example, the effective focal length fp of the projection lens is 7mm, the aperture number Fno1 is F / 1.7, the image target size IMG1 is 8mm, the working wavelength is 435nm~680nm, the total optical length of the system TTL1 is 60mm, and the back focal length BFL1 of the system is 18mm.

[0168] The focal length fa1 of the first lens group L01 is -240mm, the focal length fb1 of the second lens group L02 is 12mm, and the focal length fc1 of the first sub-lens group L11 is -27mm. The axial distance d012 between the first lens group L01 and the second lens group L02 is 3.6mm.

[0169] The focal length fa1 of the first lens group L01 satisfies |fa1 / fp|=34 with the effective focal length fp of the projection lens; the focal length fb1 of the second lens group L02 satisfies fb1 / fp=1.8 with the effective focal length fp of the projection lens; and the focal length fc1 of the first sub-lens group L11 satisfies |fc1 / fp|=4 with the effective focal length fp of the projection lens.

[0170] The radii of curvature of each lens are as follows: Lens G01 has a projection-side surface radius of curvature R011 of 28 mm and an image-source-side surface radius of curvature R012 of 67 mm; Lens G02 has a projection-side surface radius of curvature R021 of 16 mm and an image-source-side surface radius of curvature R022 of 8.5 mm; Lens G03 has a projection-side surface radius of curvature R031 of 26.5 mm and an image-source-side surface radius of curvature R032 of 8.7 mm; Lens G04 has a projection-side surface radius of curvature R041 of 22 mm and an image-source-side surface radius of curvature R042 of 9 mm; Lens G05 has a projection-side surface radius of curvature R051 of 20 mm and an image-source-side surface radius of curvature R052 of... -77mm; The sixth lens G06 has a projection-side surface radius of curvature R061 of 104mm and an image-source-side surface radius of curvature R062 of 19mm; The seventh lens G07 has a projection-side surface radius of curvature R071 of infinity and an image-source-side surface radius of curvature R072 of 15mm; The eighth lens G08 has a projection-side surface radius of curvature R081 of 16mm and an image-source-side surface radius of curvature R082 of -15mm; The ninth lens G09 has a projection-side surface radius of curvature R091 of 41mm and an image-source-side surface radius of curvature R092 of -41mm; The tenth lens G010 has a projection-side surface radius of curvature R0101 of 23mm and an image-source-side surface radius of curvature R0102 of -35mm.

[0171] The center thicknesses of each lens are as follows: the center thickness GT01 of the first lens G01 is 3.78 mm; the center thickness GT02 of the second lens G02 is 2.2 mm; the center thickness GT03 of the third lens G03 is 2.2 mm; the center thickness GT04 of the fourth lens G04 is 2 mm; the center thickness GT05 of the fifth lens G05 is 2 mm; the center thickness GT06 of the sixth lens G06 is 2 mm; the center thickness GT07 of the seventh lens G07 is 2 mm; the center thickness GT08 of the eighth lens G08 is 3.88 mm; the center thickness GT09 of the ninth lens G09 is 2.7 mm; the center thickness GT010 of the tenth lens G010 is 3.6 mm; and the center thickness GT011 of the equivalent prism 11 is 12 mm.

[0172] The air gaps between the lenses are as follows: the air gap AT01 between the first lens G01 and the second lens G02 along the optical axis is 0.2 mm; the air gap AT02 between the second lens G02 and the third lens G03 along the optical axis is 3.6 mm; the air gap AT03 between the third lens G03 and the fourth lens G04 along the optical axis is 2.8 mm; the air gap AT04 between the fourth lens G04 and the fifth lens G05 along the optical axis is 6 mm; the air gap AT05 between the fifth lens G05 and the aperture stop along the optical axis is 2.2 mm; the air gap AT05 between the aperture stop and the sixth lens G06 along the optical axis is... 06 is 1.4mm; the air gap AT07 between the sixth lens G06 and the seventh lens G07 along the optical axis is 0.9mm; the seventh lens G07 and the eighth lens G08 are cemented lenses; the air gap AT08 between the eighth lens G08 and the ninth lens G09 along the optical axis is 0.2mm; the air gap AT09 between the ninth lens G09 and the tenth lens G010 along the optical axis is 0.2mm; the air gap between the tenth lens G010 and the equivalent prism 11 along the optical axis is 4mm, and the distance between the equivalent prism 11 and the image plane 13 along the optical axis is 2mm, wherein there is a cover glass 12 with a center thickness of 1.1mm.

[0173] The air gap AT05 between the fifth lens G05 and the aperture stop along the optical axis and the air gap AT06 between the aperture stop and the sixth lens G06 along the optical axis satisfy AT04 + AT05 = 3.6 mm.

[0174] The focal lengths of the lenses are as follows: the first lens G01 has a focal length f01 of 60mm; the second lens G02 has a focal length f02 of -27mm; the third lens G03 has a focal length f03 of -21mm; the fourth lens G04 has a focal length f04 of -30mm; the fifth lens G05 has a focal length f05 of 18mm; the sixth lens G06 has a focal length f06 of -27mm; the seventh lens G07 has a focal length f07 of -17.5mm; the eighth lens G08 has a focal length f08 of 13.5mm; the ninth lens G09 has a focal length f09 of 27mm; and the tenth lens G010 has a focal length f010 of 23mm.

[0175] The optical material parameters of each lens are as follows: Lens G01 has a refractive index (N01) of 1.73 and an Abbe number (V01) of 52.3; Lens G02 has a refractive index (N02) of 1.75 and an Abbe number (V02) of 52.3; Lens G03 has a refractive index (N03) of 1.64 and an Abbe number (V03) of 60; Lens G04 has a refractive index (N04) of 1.52 and an Abbe number (V04) of 64.2; Lens G05 has a refractive index (N05) of 1.85 and an Abbe number (V05) of 23.8; and Lens G06 has a refractive index (N01) of... The refractive index of the seventh lens G07 is 1.85, and the Abbe number V06 is 23.8; the refractive index of the eighth lens G08 is 1.59, and the Abbe number V08 is 68.3; the refractive index of the ninth lens G09 is 1.75, and the Abbe number V09 is 52.3; the refractive index of the tenth lens G010 is 1.62, and the Abbe number V010 is 60.3; the refractive index of the equivalent prism 11 is 1.71, and the Abbe number V010 is 53.8.

[0176] Example 3

[0177] In this disclosed example, the effective focal length fp of the projection lens is 10mm, the aperture number Fno1 is F / 1.7, the image target size IMG1 is 11mm, the working wavelength is 435nm~680nm, the total optical length of the system TTL1 is 82mm, and the back focal length BFL1 of the system is 24mm.

[0178] The focal length fa1 of the first lens group L01 is -190mm, the focal length fb1 of the second lens group L02 is 16mm, and the focal length fc1 of the first sub-lens group L11 is -40mm. The axial distance d012 between the first lens group L01 and the second lens group L02 is 6.4mm.

[0179] The focal length fa1 of the first lens group L01 satisfies |fa1 / fp|=19 with the effective focal length fp of the projection lens; the focal length fb1 of the second lens group L02 satisfies fb1 / fp=1.6 with the effective focal length fp of the projection lens; and the focal length fc1 of the first sub-lens group L11 satisfies |fc1 / fp|=4.5 with the effective focal length fp of the projection lens.

[0180] The radii of curvature of each lens are as follows: Lens G01 has a projection-side surface radius of curvature R011 of 33.8 mm and an image-source-side surface radius of curvature R012 of 73.5 mm; Lens G02 has a projection-side surface radius of curvature R021 of 19.6 mm and an image-source-side surface radius of curvature R022 of 11.6 mm; Lens G03 has a projection-side surface radius of curvature R031 of 19.3 mm and an image-source-side surface radius of curvature R032 of 10.7 mm; Lens G04 has a projection-side surface radius of curvature R041 of 425 mm and an image-source-side surface radius of curvature R042 of 13.4 mm; Lens G05 has a projection-side surface radius of curvature R051 of 32.7 mm and an image-source-side surface radius of curvature R052 of -8 mm. 3.3mm; The radius of curvature R061 of the projection side surface of the sixth lens G06 is 209mm, and the radius of curvature R062 of the image source side surface is 29mm; The radius of curvature R071 of the projection side surface of the seventh lens G07 is 566mm, and the radius of curvature R072 of the image source side surface is 23.2mm; The radius of curvature R081 of the projection side surface of the eighth lens G08 is 23.2mm, and the radius of curvature R082 of the image source side surface is -23.5mm; The radius of curvature R091 of the projection side surface of the ninth lens G09 is 63.5mm, and the radius of curvature R092 of the image source side surface is -47.3mm; The radius of curvature R0101 of the projection side surface of the tenth lens G010 is 29.8mm, and the radius of curvature R0102 of the image source side surface is -55.5mm.

[0181] The center thicknesses of each lens are as follows: the center thickness GT01 of the first lens G01 is 5mm; the center thickness GT02 of the second lens G02 is 2.9mm; the center thickness GT03 of the third lens G03 is 2.9mm; the center thickness GT04 of the fourth lens G04 is 2.7mm; the center thickness GT05 of the fifth lens G05 is 2.7mm; the center thickness GT06 of the sixth lens G06 is 2.7mm; the center thickness GT07 of the seventh lens G07 is 2.7mm; the center thickness GT08 of the eighth lens G08 is 4.8mm; the center thickness GT09 of the ninth lens G09 is 3.7mm; the center thickness GT010 of the tenth lens G010 is 4.8mm; and the center thickness GT011 of the equivalent prism 11 is 12mm.

[0182] The air gaps between the lenses are as follows: the air gap AT01 between the first lens G01 and the second lens G02 along the optical axis is 0.27 mm; the air gap AT02 between the second lens G02 and the third lens G03 along the optical axis is 3.4 mm; the air gap AT03 between the third lens G03 and the fourth lens G04 along the optical axis is 3.8 mm; the air gap AT04 between the fourth lens G04 and the fifth lens G05 along the optical axis is 8 mm; the air gap AT05 between the fifth lens G05 and the aperture stop ST1 along the optical axis is 3.1 mm; the air gap A between the aperture stop ST1 and the sixth lens G06 along the optical axis is... T06 is 3.3mm; the air gap AT07 between the sixth lens G06 and the seventh lens G07 along the optical axis is 1.2mm; the seventh lens G07 and the eighth lens G08 are cemented lenses; the air gap AT08 between the eighth lens G08 and the ninth lens G09 along the optical axis is 0.27mm; the air gap AT09 between the ninth lens G09 and the tenth lens G010 along the optical axis is 0.27mm; the air gap between the tenth lens G010 and the equivalent prism 11 along the optical axis is 5.5mm, and the distance between the equivalent prism 11 and the image plane 13 along the optical axis is 2.6mm, in which there is a cover glass 12 with a center thickness of 1.1mm.

[0183] The air gap AT05 between the fifth lens G05 and the aperture stop ST1 along the optical axis and the air gap AT06 between the aperture stop ST1 and the sixth lens G06 along the optical axis satisfy AT04 + AT05 = 6.4 mm.

[0184] The focal lengths of each lens are as follows: the first lens G01 has a focal length of f01 of 77mm; the second lens G02 has a focal length of f02 of -40mm; the third lens G03 has a focal length of f03 of -38mm; the fourth lens G04 has a focal length of f04 of -27mm; the fifth lens G05 has a focal length of f05 of 25mm; the sixth lens G06 has a focal length of f06 of -46mm; the seventh lens G07 has a focal length of f07 of -25mm; the eighth lens G08 has a focal length of f08 of 21mm; the ninth lens G09 has a focal length of f09 of 34mm; and the tenth lens G010 has a focal length of f010 of 30mm.

[0185] The optical material parameters of each lens are as follows: Lens G01 has a refractive index (N01) of 1.75 and an Abbe number (V01) of 52.3; Lens G02 has a refractive index (N02) of 1.81 and an Abbe number (V02) of 46.2; Lens G03 has a refractive index (N03) of 1.71 and an Abbe number (V03) of 54.8; Lens G04 has a refractive index (N04) of 1.5 and an Abbe number (V04) of 81.6; Lens G05 has a refractive index (N05) of 1.91 and an Abbe number (V05) of 27; and Lens G06 has a refractive index of... The refractive index of the seventh lens G07 is 1.72, and the Abbe number V06 is 24.9; the refractive index of the eighth lens G08 is 1.57, and the Abbe number V08 is 68.8; the refractive index of the ninth lens G09 is 1.78, and the Abbe number V09 is 48.9; the refractive index of the tenth lens G010 is 1.64, and the Abbe number V010 is 61.5; the refractive index of the equivalent prism 11 is 1.71, and the Abbe number V010 is 53.8.

[0186] Example 2

[0187] In the field of machine vision technology, besides the projection lens affecting detection accuracy, the characteristics of the imaging lens are also crucial. Existing imaging technologies cannot achieve high-definition imaging across the entire field of view on a sufficiently large target surface. They suffer from significant drawbacks, such as insufficient edge field-of-view illumination (low uniformity across the entire field of view) and noticeable differences in image formation across different wavelengths (large chromatic aberration). Furthermore, most imaging lenses exhibit poor temperature stability and cannot achieve stable imaging without focus shift across the entire temperature range of -20℃ to 60℃.

[0188] In view of this, the present disclosure also provides an imaging lens that can further improve resolution compared to industrial lenses of the same focal length, while having high uniformity, low chromatic aberration and thermal optical performance, thereby improving detection accuracy, provided that the field of view is large enough.

[0189] This disclosure provides an imaging lens that achieves clear imaging over a sufficiently large field of view, while maintaining ultra-high resolution, low chromatic aberration, high uniformity, no pyrolysis, and low cost.

[0190] Combination Figure 5 The imaging lens of this embodiment includes a front lens group L1, a middle lens group L2 and a rear lens group L3 arranged coaxially from the object side to the image side.

[0191] These three lens groups can each consist of at least one lens, which can be a doublet or a cemented lens. The lenses in the three lens groups can be spherical lenses, aspherical lenses, or a combination of spherical and aspherical lenses.

[0192] Lenses can be made of materials such as colorless optical glass and optical plastics. Optical plastics are low-cost for mass production, easy to process into aspherical surfaces, and lightweight. Optical glass has stable mechanical and thermal properties, and chromatic aberration can be eliminated and image quality improved by combining different refractive indices and Abbe numbers. Industrial robots are used in diverse environments, requiring high environmental temperature stability.

[0193] The imaging lens of this embodiment has a half field of view of 20° to 30°; the image-side target size IMG2 of the imaging lens is 6mm to 12mm; the effective focal length fi of the imaging lens is 8mm to 14mm; and the aperture number Fno2 is F2.0 to F8.0.

[0194] The focal length fa2 of the front lens group L1 is -30mm to -15mm; the focal length fb2 of the middle lens group L2 is 12mm to 27mm; and the focal length fc2 of the rear lens group L3 is 15mm to 30mm.

[0195] The axial distance d12 between the front lens group L1 and the middle lens group L2 is 2 mm to 7 mm; the axial distance d23 between the middle lens group L2 and the rear lens group L3 is 6 mm to 15 mm. In this disclosure, the axial distance refers to the distance along the optical axis.

[0196] In some embodiments of this disclosure, the effective focal length fi of the imaging lens is 9mm to 13mm, the aperture number Fno2 is F / 2.8, the half field of view is 22.6°, the image target size IMG2 is 7.21mm to 10.41mm, the working wavelength is 400nm to 700nm, and the total optical length TTL2 of the system is 46.7mm to 67.5mm.

[0197] The effective focal length fi of the imaging lens and the image-side target size IMG2 of the imaging lens satisfy the condition 0.85 < fi / IMG2 < 1.81.

[0198] Continue to refer to Figure 5 The imaging lens of this embodiment includes: a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, a ninth lens G9, a tenth lens G10, and an eleventh lens G11 arranged coaxially from the object side to the image side. An aperture stop ST2 is provided between the seventh lens G7 and the eighth lens G8.

[0199] from Figure 5 It can be seen that, under the premise of ensuring the optical path size and volume of the imaging lens, the imaging lens has a simple structure and the individual lenses have good manufacturability.

[0200] Among them, the first lens G1, the second lens G2 and the third lens G3 form the front lens group L1;

[0201] The fourth lens G4, the fifth lens G5, the sixth lens G6, and the seventh lens G7 form the middle lens group L2;

[0202] The eighth lens G8, the ninth lens G9, the tenth lens G10, and the eleventh lens G11 form the lens group L3.

[0203] The front lens group L1 has negative optical power, while the middle lens group L2 and the rear lens group L3 each have positive optical power. The front lens group L1 diverges light rays, while the middle lens group L2 and the rear lens group L3 converge light rays. This structure is beneficial for balancing aberrations, controlling distortion, achieving heatless operation, and providing space for optimizing the position of the aperture stop.

[0204] In some embodiments, the focal length fa2 of the front lens group L1 is -25.47mm to -17.63mm; the focal length fb2 of the middle lens group L2 is 15.69mm to 22.67mm; and the focal length fc2 of the rear lens group L3 is 19.09mm to 27.58mm.

[0205] The axial distance d12 between the front lens group L1 and the middle lens group L2 is 3.4mm to 5.0mm; the axial distance d23 between the middle lens group L2 and the rear lens group L3 is 8.5mm to 12.4mm.

[0206] In some embodiments of this disclosure, the focal length fa2 of the front lens group L1 and the effective focal length fi of the imaging lens satisfy 1.95 < |fa2 / fi| < 1.96, the focal length fb2 of the middle lens group L2 and the effective focal length fi of the imaging lens satisfy 1.74 < fb2 / fi < 1.75, and the focal length fc2 of the rear lens group L3 and the effective focal length fi of the imaging lens satisfy 2.12 < fc2 / fi < 2.13.

[0207] The axial distance d12 between the front lens group L1 and the middle lens group L2, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 satisfy 0.4 < d12 / d23 < 0.41.

[0208] Each lens or lens group of the imaging lens disclosed herein has its own unique functional focus. By combining eleven lenses and selecting materials, the goals of ultra-high resolution, high uniformity, low chromatic aberration, and no pyrolysis are achieved.

[0209] In the disclosed embodiment, the first lens G1 has positive optical power; the second lens G2 has negative optical power; the third lens G3 has negative optical power; the fourth lens G4 has negative optical power; the fifth lens G5 has positive optical power; the sixth lens G6 has positive optical power; the seventh lens G7 has positive optical power; the eighth lens G8 has positive optical power; the ninth lens G9 has positive optical power; and the tenth lens G10 and the eleventh lens G11 each have negative optical power.

[0210] The first lens G1 is a convex-concave lens, the second lens G2 is a convex-concave lens, the first lens G1 and the second lens G2 are cemented lenses, the third lens G3 is a convex-concave lens, the fourth lens G4 is a biconcave lens, the fifth lens G5 is a biconvex lens, the fourth lens G4 and the fifth lens G5 are cemented lenses, the sixth lens G6 is a biconvex lens, the seventh lens G7 is a biconvex lens, the eighth lens G8 is a concave-convex lens, the ninth lens G9 is a biconvex lens, the tenth lens G10 is a biconvex lens, the eleventh lens G11 is a concave-convex lens, and the tenth lens G10 and the eleventh lens G11 are cemented lenses.

[0211] In this embodiment, by setting the optical power and surface shape of the eleven lenses, the imaging lens has a high diffraction limit, providing optimization space for achieving high resolution. Furthermore, by balancing the distribution of optical power among the lenses and coordinating the surface shapes, aberrations are reduced, thus improving resolution.

[0212] The first lens G1 has positive optical power, which can converge off-axis beams at large angles, reducing the occurrence of higher-order aberrations (such as spherical aberration and coma). The smooth light deflection lays the foundation for subsequent aberration correction.

[0213] The second lens G2 and the first lens G1 are cemented lenses, which is beneficial for correcting the axial chromatic aberration of the front lens group. The negative optical power of the second lens G2 is an important component of the negative optical power of the front lens group L1.

[0214] The third lens G3 has negative optical power and a convex-concave meniscus shape, which further diverges light rays and primarily corrects field curvature and astigmatism. It corrects the field curvature caused by the diverging rays from the front lens group, making the entire image plane flatter and ensuring sharpness at both the edges and center of the field of view. Furthermore, the negative optical power of the third lens G3 is the main contributor to the negative optical power of the front lens group L1.

[0215] The positive and negative optical powers of the fourth lens G4 and the fifth lens G5 are combined to form a cemented lens, which constitutes a chromatic aberration correction unit to help control spherical aberration and field curvature.

[0216] The sixth lens G6 has positive optical power and is a biconvex lens used to converge light rays. In this embodiment, the refractive index of the sixth lens G6 is greater than 1.9 and the Abbe number is less than 25. The high refractive index allows for the use of a smoother surface, significantly reducing the contribution of spherical aberration and reducing spherical aberration while maintaining optical power.

[0217] The seventh lens, G7, has positive optical power and is the lens in front of the aperture stop ST2, which can optimize central aberration.

[0218] The eighth lens G8 behind the aperture stop ST2 has negative optical power, which balances the positive optical power of the rear lens group L3.

[0219] The ninth lens G9 has positive optical power and strong light-converging ability; it also provides core positive refractive power for the rear lens group L3, converging light onto the image plane and directly affecting the sharpness of the image. In this embodiment, the ninth lens G9 has an Abbe number greater than 65 and a refractive index less than 1.6, which means that while providing optical power, the ninth lens G9 produces relatively small chromatic aberration and spherical aberration.

[0220] The tenth lens G10 and the eleventh lens G11 form a cemented lens, both of which have negative optical power. The Abbe number of the tenth lens G10 is greater than 65, and the Abbe number of the eleventh lens G11 is less than 25. The combination of the two can effectively correct chromatic aberration.

[0221] It should be noted that the above restrictions on refractive index and Abbe number only apply to one endpoint, not that the other endpoint can be chosen infinitely. The following section restricts the range of Abbe number and refractive index for each lens.

[0222] In this embodiment, the first lens G1 has a refractive index N1 of 1.65–1.70 and an Abbe number V1 of 54.5–55; the second lens G2 has a refractive index N2 of 1.50–1.55 and an Abbe number V2 of 52.0–52.5; the third lens G3 has a refractive index N3 of 1.50–1.55 and an Abbe number V3 of 62.0–62.5; the fourth lens G4 has a refractive index N4 of 1.85–1.90 and an Abbe number V4 of 23.5–24.0; the fifth lens G5 has a refractive index N5 of 1.65–1.70 and an Abbe number V5 of 54.5–55.0; and the sixth lens G6 has a refractive index N6 of 1.90–1.70. The refractive index of the seventh lens G7 is 1.95, and the Abbe number V6 is 20.5–21.0; the refractive index of the eighth lens G8 is 1.60–1.65, and the Abbe number V8 is 63.0–63.5; the refractive index of the ninth lens G9 is 1.55–1.60, and the Abbe number is 68.0–68.5; the refractive index of the tenth lens G10 is 1.55–1.60, and the Abbe number V10 is 68.0–68.5; the refractive index of the eleventh lens G11 is 1.85–1.90, and the Abbe number V11 is 23.5–24.0.

[0223] In this embodiment, the radius of curvature R11 of the incident surface of the first lens G1 is 16.1 mm to 23.4 mm, and the radius of curvature R12 of the exit surface is 87.7 mm to 126.8 mm; the radius of curvature R21 of the incident surface of the second lens G2 is 87.7 mm to 126.8 mm, and the radius of curvature R22 of the exit surface is 6.9 mm to 10.0 mm; the radius of curvature R31 of the incident surface of the third lens G3 is 13.8 mm to 20.1 mm, and the radius of curvature R32 of the exit surface is... The radius of curvature of the incident surface of the fourth lens G4 is 7.1mm to 10.4mm; the radius of curvature of the incident surface of the fifth lens G5 is 35.6mm to 51.5mm, and the radius of curvature of the exit surface of the sixth lens G6 is 49.7mm to 71.9mm. The radius of curvature R62 of the seventh lens G7 is -78.0 mm to -53.9 mm; the radius of curvature R71 of the incident surface of the seventh lens G7 is 35.8 mm to 51.9 mm, and the radius of curvature R72 of the exit surface is -354.1 mm to -245.1 mm; the radius of curvature R81 of the incident surface of the eighth lens G8 is -61.2 mm to -42.3 mm, and the radius of curvature R82 of the exit surface is -23.4 mm to -16.1 mm; the radius of curvature R91 of the incident surface of the ninth lens G9 is 71 mm. The radius of curvature of the incident surface of the tenth lens G10 is 1mm to 102.9mm, and the radius of curvature of the exit surface R92 is -41.0mm to -28.3mm; the radius of curvature of the incident surface R101 of the eleventh lens G11 is 30.6mm to 44.3mm, and the radius of curvature of the exit surface R102 is -13.1mm to -9.0mm; the radius of curvature of the incident surface R111 of the eleventh lens G11 is -13.1mm to -9.0mm, and the radius of curvature of the exit surface R112 is -147.1mm to -101.8mm.

[0224] Combination Figure 5 The incident surface of a lens is the surface of the lens facing the object; the exit surface of a lens is the surface of the lens facing the image.

[0225] In this embodiment of the present disclosure, the radius of curvature R11 of the incident surface of the first lens G1 and the radius of curvature R22 of the exit surface of the second lens G2 satisfy 1.6 < R11 / R22 < 3.4.

[0226] The radius of curvature R41 of the incident surface of the fourth lens G4 and the radius of curvature R52 of the exit surface of the fifth lens G5 satisfy 0.5 < R41 / R52 < 1.2.

[0227] The radius of curvature R101 of the incident surface of the tenth lens G10 and the radius of curvature R112 of the exit surface of the eleventh lens G11 satisfy 0.2 < |R101 / R112| < 0.5.

[0228] In this embodiment, the center thickness GT1 of the first lens G1 is 3.5mm to 5.1mm; the center thickness GT2 of the second lens G2 is 1.0mm to 1.6mm; the center thickness GT3 of the third lens G3 is 2.4mm to 3.5mm; the center thickness GT4 of the fourth lens G4 is 1.0mm to 1.5mm; the center thickness GT5 of the fifth lens G5 is 4.5mm to 6.6mm; the center thickness GT6 of the sixth lens G6 is 1.7mm to 2.6mm; the center thickness GT7 of the seventh lens G7 is 1.6mm to 2.4mm; the center thickness GT8 of the eighth lens G8 is 1.4mm to 2.1mm; the center thickness GT9 of the ninth lens G9 is 1.4mm to 2.2mm; the center thickness GT10 of the tenth lens G10 is 2.0mm to 3.1mm; and the center thickness GT11 of the eleventh lens G11 is 1.0mm to 1.5mm. The center thickness of the lens refers to the thickness of the lens at its center along the optical axis.

[0229] In this embodiment of the present disclosure, the center thickness GT1 of the first lens G1 and the center thickness GT2 of the second lens G2 satisfy 2.1 < GT1 / GT2 < 5.1;

[0230] The center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.15 < GT4 / GT5 < 0.4;

[0231] The center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 1.3 < GT10 / GT11 < 3.1.

[0232] In this embodiment, the first lens G1 and the second lens G2 are cemented lenses; the air gap AT1 between the second lens G2 and the third lens G3 along the optical axis is 2.48 mm to 3.59 mm; the air gap AT2 between the third lens G3 and the fourth lens G4 along the optical axis is 3.43 mm to 4.97 mm; the fourth lens G4 and the fifth lens G5 are cemented lenses; the air gap AT3 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.15 mm to 0.23 mm; the air gap AT4 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0.07 mm to 0.11 mm; the seventh lens G7 and the aperture... The air gap distance AT5 between aperture stop ST2 and the optical axis is 6.87 mm to 9.94 mm; the air gap distance AT6 between aperture stop ST2 and the eighth lens G8 and the optical axis is 1.68 mm to 2.43 mm; the air gap distance AT7 between the eighth lens G8 and the ninth lens G9 and the optical axis is 0.12 mm to 0.18 mm; the air gap distance AT8 between the ninth lens G9 and the tenth lens G10 and the optical axis is 0.25 mm to 0.37 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air gap distance BFL between the eleventh lens G11 and the image plane and the optical axis is 9.68 mm to 14.00 mm.

[0233] In this embodiment of the present disclosure, the air gap distance AT5 between the seventh lens G7 and the aperture stop ST2 along the optical axis and the air gap distance AT6 between the aperture stop ST2 and the eighth lens G8 along the optical axis satisfy 8.5 < AT5 + AT6 < 12.4.

[0234] The air gap distance BFL between the eleventh lens G11 and the image plane along the optical axis satisfies 0.14 < BFL / TTL2 < 0.27 with respect to the total optical length of the system TTL2.

[0235] In this embodiment, the focal length f1 of the first lens G1 is 23.7mm to 34.4mm; the focal length f2 of the second lens G2 is -18.4mm to -12.6mm; the focal length f3 of the third lens G3 is -48.1mm to -33.2mm; the focal length f4 of the fourth lens G4 is -12.4mm to -8.5mm; the focal length f5 of the fifth lens G5 is 15.9mm to 23.1mm; and the focal length f6 of the sixth lens G6 is... The focal length of the seventh lens G7 is 37.6mm to 54.5mm; the focal length of the eighth lens G8 is 40.6mm to 58.7mm; the focal length of the ninth lens G9 is 33.7mm to 48.8mm; the focal length of the tenth lens G10 is -122.3mm to -84.6mm; and the focal length of the eleventh lens G11 is -61.8mm to -42.7mm.

[0236] In this embodiment, the focal length f1 of the first lens G1 satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; the focal length f2 of the second lens G2 satisfies 0.9 < |f2 / fi| < 2.1 with respect to the effective focal length fi of the lens; the focal length f3 of the third lens G3 satisfies 2.5 < |f3 / fi| < 5.4 with respect to the effective focal length fi of the lens; the focal length f4 of the fourth lens G4 satisfies 0.6 < |f4 / fi| < 1.4 with respect to the effective focal length fi of the lens; the focal length f5 of the fifth lens G5 satisfies 1.2 < f5 / fi < 2.5 with respect to the effective focal length fi of the lens; and the focal length f6 of the sixth lens G6 satisfies 1.2 < f5 / fi < 2.5 with respect to the effective focal length fi of the lens; and the focal length f6 of the sixth lens G6 satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; and the focal length f6 of the sixth lens G1 satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; and the focal length f2 of the second lens G2 satisfies 0.9 < |f2 / fi| < 2.1 with respect to the effective focal length fi of the lens; and the focal length f3 of the third lens G3 satisfies 2.5 < |f3 / fi| < 5.4 with respect to the effective focal length fi of the lens; and the focal length f4 of the fourth lens G4 satisfies 0.6 < |f4 / fi| < 1.4 with respect to the effective focal length fi of the lens; and the focal length f6 of the sixth lens G6 satisfies 1.2 < f5 / fi < 2.5 with respect to the effective focal length fi The focal lengths fi satisfy 2.0 < f6 / fi < 4.2; the focal length f7 of the seventh lens G7 satisfies 2.8 < f7 / fi < 6.1; the focal length f8 of the eighth lens G8 satisfies 3.1 < f8 / fi < 6.6; the focal length f9 of the ninth lens G9 satisfies 2.5 < f9 / fi < 5.5; the focal length f10 of the tenth lens G10 satisfies 6.5 < |f10 / fi| < 1.4; the focal length f11 of the eleventh lens G11 satisfies 3.2 < |f11 / fi| < 6.9.

[0237] By setting up the combination structure of each lens as described above, the imaging performance of the imaging lens is improved.

[0238] The first lens G1 and the second lens G2 are cemented together, and there is a difference between the Abbe number of the first lens G1 and the Abbe number of the second lens G2, which serves to correct axial chromatic aberration.

[0239] The negative optical power of the second lens G2, in conjunction with the positive optical power of the first lens G1, provides thermal compensation.

[0240] In the front lens group L1, the third lens G3 has the highest Abbe number, which is beneficial for improving thermal stability and suppressing residual chromatic aberration generated by the front lens group L1.

[0241] The sixth lens, G6, has the highest refractive index and the lowest Abbe number among the eleven lenses. Its high refractive index is crucial for maintaining optical power while reducing spherical aberration. Moreover, the high refractive index allows for the use of smoother surfaces, significantly reducing spherical aberration and improving the MTF of the central field of view.

[0242] The Abbe number of the seventh lens G7 is greater than that of the sixth lens G6, and the difference between the Abbe numbers of the seventh lens G7 and the sixth lens G6 can be greater than 20. The difference between the Abbe number of the seventh lens G7 and the Abbe number of the lens with the highest Abbe number among the eleven lenses is also greater than 20. Thus, the seventh lens G7, with its relatively moderate focal length and medium Abbe number, is ideally positioned for optimizing aberration balance. A significant gap exists between the seventh lens G7 and the aperture stop ST2, providing conditions for achieving a symmetrical optical path. Furthermore, as the last lens before the aperture stop ST2, optimizing the seventh lens G7 can first improve the imaging quality of the edge field of view, achieving high uniformity across the entire image plane.

[0243] The eighth lens, G8, participates in thermal compensation. Among these eleven lenses, arranged from highest to lowest Abbe number, the eighth lens, G8, ranks among the top three in Abbe number. The eighth lens, G8, uses a material with a high Abbe number, resulting in better thermal stability.

[0244] The ninth lens G9 and the tenth lens G10 have the same Abbe number, and the ninth lens G9 and the tenth lens G10 have the largest Abbe number; the ninth lens G9 and the tenth lens G10 have the same refractive index.

[0245] The ninth lens, G9, employs a high Abbe number and a relatively low refractive index, resulting in minimal chromatic and spherical aberration while providing optical power. Furthermore, the high Abbe number material contributes the least to chromatic aberration.

[0246] The combination of the high Abbe number and weak negative power of the tenth lens G10 and the low Abbe number and negative power of the eleventh lens G11 is key to efficiently correcting magnification chromatic aberration and ensuring color consistency and resolution at the edge of the field of view.

[0247] The imaging lens disclosed herein possesses ultra-high resolution while also being compatible with high uniformity, low chromatic aberration, no pyrolysis, extremely high manufacturability, and extremely low cost.

[0248] The following lenses play a crucial role in achieving the ultra-high resolution of the imaging lens: The first lens G1 of the front lens group L1 balances incident light and reduces higher-order aberrations. The high refractive index of the sixth lens G6 of the middle lens group L2 helps reduce spherical aberration; the seventh lens G7 optimizes central aberration. The ninth lens G9 of the rear lens group L3 provides core positive optical power. These three lens groups work together to eliminate spherical and coma aberrations; the overall balanced optical power distribution helps reduce aberrations.

[0249] The following lenses play a crucial role in the high uniformity of the imaging lens, which translates to low field curvature, low astigmatism, low distortion, and low chromatic aberration at magnification: The third lens G3 in the front lens group L1 and the eighth lens G8 in the rear lens group L3 strongly correct field curvature. The aperture stop ST2, located between the seventh lens G7 and the eighth lens G8, achieves optical path symmetry, which helps reduce off-axis aberrations. The seventh lens G7 in the middle lens group L2 is designed to optimize off-axis coma and astigmatism. The tenth lens G10 and the eleventh lens G11 are cemented together to strongly correct chromatic aberration at magnification. Furthermore, the eleventh lens G11 plays a final role in fine-tuning field curvature, astigmatism, distortion, and telecentrism.

[0250] Low chromatic aberration in an imaging lens means low axial chromatic aberration, low second-order chromatic aberration, and low magnification chromatic aberration. Specifically, the first lens G1 and the second lens G2 are cemented together to correct the axial chromatic aberration of the original lens group L1. The fourth lens G4 and the fifth lens G5 are cemented together, utilizing the combination of the ultra-high dispersion fourth lens G4 and the low dispersion fifth lens G5 to strongly correct the system's second-order chromatic aberration (gF line chromatic aberration). The third lens G3, the eighth lens G8, and the ninth lens G9 use high Abbe number materials, which helps suppress chromatic aberration. The combination of the high-dispersion eleventh lens G11 and the high Abbe number tenth lens G10 helps correct magnification chromatic aberration. The Abbe number arrangement of the eleven lenses helps to balance chromatic aberration overall.

[0251] The lens disclosed also features heat-free characteristics. The front lens group L1 has negative optical power, while the middle lens group L2 and rear lens group L3 each have positive optical power. Temperature drift is reduced by utilizing the differences in thermal characteristics of the front lens group L1, middle lens group L2, and rear lens group L3—namely, the positive and negative compensation of their coefficients of thermal expansion and refractive index temperature coefficients. The focal length of the middle lens group L2 plays an adjustment role. Furthermore, among the eleven lenses, the third lens G3, the eighth lens G8, the ninth lens G9, and the tenth lens G10 have higher Abbe numbers, and their refractive index temperature coefficients are generally smaller or more stable, which is beneficial for improving the thermal stability of the imaging lens. The material combination of the cemented fourth lens G4 and fifth lens G5, as well as the cemented tenth lens G10 and eleventh lens G11, further enhances the thermal stability of the imaging lens. In addition, reasonable air gaps, such as a larger axial distance d23 between the middle lens group L2 and the rear lens group L3, provide space for thermal expansion and participate in thermal compensation calculations.

[0252] The lens disclosed herein can effectively balance and process various aberrations through the synergistic effect between the aforementioned lenses, thereby improving the imaging performance and thermal stability of the imaging lens.

[0253] The imaging lens disclosed herein does not incorporate vignetting during its design process, allowing as much light from the peripheral field of view as possible to pass through the lens and reach the image plane, thereby enabling the lens to achieve high relative illumination and ensuring the uniformity of the image.

[0254] All lenses in the imaging lens disclosed herein are glass lenses. Compared to plastic, glass has higher transmittance and better imaging effect. Furthermore, glass has far better physical and chemical stability than plastic, making it more adaptable to various environments and extending its service life.

[0255] The imaging lens disclosed herein uses spherical lenses for each element. Spherical glass lenses are significantly cheaper than aspherical glass lenses.

[0256] The imaging lens disclosed herein has reasonable shapes, processing tolerances, and assembly tolerances for each lens element, which is conducive to improving production yield.

[0257] Combination Figure 6 In the field curvature diagram, the vertical axis represents the field of view, and the horizontal axis is in millimeters. Solid and dashed lines represent the meridional and sagittal components of the field curvature at different wavelengths within the working band. Solid lines represent the meridional field curvature component, which is perpendicular to the optical axis; dashed lines represent the sagittal field curvature component, which is along the optical axis.

[0258] Combination Figure 7 In the distortion diagram, the vertical axis represents the field of view, and the horizontal axis represents the distortion value. Each curve represents the distortion value at different wavelengths within the working band.

[0259] In this disclosure, the field curvature of the imaging lens across the entire field of view is less than 20 μm; the distortion curve of the imaging lens exhibits a monotonic change across the entire field of view, with an optical distortion value of less than 4.5%; this ensures that the entire imaging image exhibits minimal distortion, facilitating algorithm correction and thus guaranteeing the imaging effect.

[0260] Combination Figures 8 to 10 The MTF (Modulation Transfer Function) curve is plotted with the horizontal axis representing spatial frequency in linear periods per millimeter (also called line pairs per millimeter, lp / mm) and the vertical axis representing contrast in the range of 0-1. The solid and dashed lines represent the meridional and sagittal components of the MTF at different fields of view. The solid line represents the meridional contrast component, which is perpendicular to the optical axis; the dashed line represents the sagittal contrast component, which is along the optical axis. Higher curves and closer together indicate higher image quality.

[0261] like Figure 8As shown, the black line represents the diffraction limit. The diffraction limit curve represents the theoretical maximum value of MTF (Mean Transmission Frequency) as a function of spatial frequency in an aberration-free, ideal optical system. The MTF curve of any practical lens cannot exceed this curve, but can only approach it. The MTF diffraction limit is the physical ceiling of an optical system's resolution, determined by wavelength and aperture. A design that closely adheres to the diffraction limit signifies near-perfect aberration correction and excellent overall performance. Figure 8 In this lens, the MTF curve closely approximates the diffraction-limited curve, exhibiting high resolution and making it suitable for use in ultra-high pixel chips.

[0262] Combination Figure 9 The imaging lens has a contrast ratio greater than 0.3 at a spatial frequency of 400 lp / mm with a full field of view MTF value.

[0263] The minimum resolvable line pair width of the imaging lens is 1 / 400 lp / mm, which is 2.5 μm. According to the Nyquist sampling theorem, the sensor pixel size needs to be less than or equal to 1.25 μm to fully utilize the optical resolution. For a 1 / 1.8-inch image sensor with an aspect ratio of 4:3, the actual imaging area is typically 7.2 mm × 5.4 mm, and the individual pixel size of a 24-megapixel sensor is 1.2 μm.

[0264] Thus, the imaging lens disclosed herein meets the application requirements of 24-megapixel high resolution when adapted to a 1 / 1.8-inch image sensor, and the imaging quality is very high.

[0265] Combination Figure 10 The imaging lens of this disclosure exhibits zero contrast attenuation across its entire field of view MTF value at a spatial frequency of 800 lp / mm. This enables the lens to resolve extremely fine microscopic details that are indistinguishable by conventional optical systems, providing imaging capabilities for fields such as semiconductor nanoscale defect detection, super-resolution microscopy, cutting-edge lithography verification, and ultra-high precision machine vision. This lens fundamentally raises the resolution ceiling of optical systems, improving image clarity and information acquisition capabilities.

[0266] The imaging lens of this embodiment not only has extremely high MTF contrast across the entire image, but also exhibits exceptional convergence, while field curvature and astigmatism are effectively suppressed to minimal levels. This characteristic ensures that the lens provides extremely uniform, sharp, and detail-rich high-contrast images across the entire image plane and under broad spectral conditions, significantly eliminating edge image quality degradation. This enhances the overall image clarity and detail reproduction capabilities required for applications such as industrial visual inspection and precision measurement, guaranteeing inspection accuracy and reliability.

[0267] Combination Figure 11The horizontal axis of the relative illumination curve represents the field of view, in millimeters. 0 mm represents the central field of view, and 4.4 mm represents the edge field of view. The vertical axis represents relative illumination, ranging from 0 to 1. The imaging lens of this disclosure has a total field of view relative illumination greater than 92%. This extremely high relative illumination ensures the uniformity of the overall image, preventing vignetting even at the edges, and minimizing the difference in brightness between the edges and the center.

[0268] exist Figure 12 In the transverse chromatic aberration diagram, the horizontal axis represents the transverse chromatic aberration offset in μm, and the vertical axis represents the field of view in mm. The dashed line at ±2.0 μm denotes the Airy disk boundary. The blue line is the F line, with a wavelength of 486.1 nm, which is the Hβ spectral line of hydrogen, representing the blue light band; the red line is the C line, with a wavelength of 656.3 nm, which is the Hα spectral line of hydrogen, representing the red light band. The F / C line accurately characterizes the dispersion properties. The vertical line at 0 μm is the d line, with a wavelength of 587.6 nm, a helium spectral line, serving as an international resolution evaluation benchmark.

[0269] Depend on Figure 12 As can be seen from the embodiments disclosed herein, the offset of the transverse chromatic aberration is less than 2 μm across the entire operating wavelength of the imaging lens and converges within the Airy disk. This extremely small chromatic aberration effectively avoids issues such as color fringing (chromatic aberration), detail blurring, and spatial displacement in the imaging process.

[0270] The imaging lens of this disclosure covers the core spectrum from blue to red light, possessing both technical versatility and application universality. It is directly compatible with cutting-edge applications such as semiconductor detection (red light penetrates silicon-based materials), multicolor fluorescence microscopy (blue-green excitation / red light emission), and high-precision industrial vision (blue LED lighting).

[0271] Figure 13 , Figure 14 , Figure 15 The figures are MTF (Modulation Transfer Function) curves of the imaging lens of this embodiment when focusing at 20°C, -20°C and 60°C.

[0272] Within the temperature range of -20℃ to 60℃, the contrast variation of the imaging lens's full-field MTF value at a spatial frequency of 200 lp / mm is less than 0.05.

[0273] Figure 16 , Figure 17 as well as Figure 18The figures show the MTF (Modulation Transfer Function) curves under defocus conditions at 20°C, -20°C, and 60°C, respectively, according to embodiments of this disclosure. In these curves, the horizontal axis represents the focal displacement (or simply focal shift), in millimeters; the vertical axis represents the contrast, with a value range of 0-1. The solid and dashed lines represent the meridional and sagittal components of the MTF under different fields of view.

[0274] Within the temperature range of -20℃ to 60℃, the focal shift of the imaging lens changes by less than 0.005mm.

[0275] The imaging lens disclosed herein has good temperature stability and is suitable for high-precision imaging requirements under harsh temperature conditions.

[0276] Reference Figure 19 The dot plot shows that the imaging rays from all fields of view (including the edge fields of view) are highly convergent, and the dispersion spot converges within the theoretical Airy disk range, indicating that the imaging lens of this embodiment has stable imaging and near-diffraction-limited high imaging quality. The high convergence of the dot plot within the Airy disk indicates that the imaging lens of this disclosure has excellent control and correction of monochromatic geometric aberrations such as astigmatism and coma that affect imaging sharpness.

[0277] The imaging lens disclosed herein achieves approximately the physical limit of resolution (diffraction limit) achievable by an optical system across the entire imaging plane. This ensures ultra-high and uniform imaging sharpness from the center to the edge of the image, effectively eliminating degradation factors such as decreased edge field of view resolution, astigmatism, and coma commonly found in traditional designs.

[0278] As can be seen from the above, the imaging lens of this embodiment has ultra-high resolution, while also being compatible with high uniformity, low chromatic aberration, no pyrolysis, extremely high mass production capability, and extremely low cost.

[0279] The following section presents three specific examples of imaging lenses.

[0280] Example 1

[0281] In this disclosed example, the effective focal length f of the imaging lens is 9 mm, the aperture number Fno2 is F / 2.8, the half field of view is 22.5°, the image-side target size IMG2 is 7.21 mm, the operating wavelength is 400 nm to 700 nm, and the total optical length TTL2 of the system is 46.7 mm.

[0282] The effective focal length fi of the imaging lens and the image-side target size IMG2 satisfy the condition 1.24 < fi / IMG2 < 1.25.

[0283] The focal length fa2 of the front lens group L1 is -17.63mm, the focal length fb2 of the middle lens group L2 is 15.69mm, and the focal length fc2 of the rear lens group L3 is 19.10mm. The axial distance d12 between the front lens group L1 and the middle lens group L2 is 3.44mm, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 is 8.56mm.

[0284] The focal length fa2 of the front lens group L1 and the effective focal length fi of the imaging lens satisfy 1.95 < |fa2 / fi| < 1.96. The focal length fb2 of the middle lens group L2 and the effective focal length fi of the imaging lens satisfy 1.74 < fb2 / fi < 1.75. The focal length fc2 of the rear lens group L3 and the effective focal length fi of the imaging lens satisfy 2.12 < fc2 / fi < 2.13. The axial distance d12 between the front lens group L1 and the middle lens group L2, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 satisfy 0.40 < d12 / d23 < 0.41.

[0285] The radii of curvature of each lens are as follows: Lens G1 has an incident surface radius of curvature R11 of 16.14 mm and an exit surface radius of curvature R12 of 87.76 mm; Lens G2 has an incident surface radius of curvature R21 of 87.76 mm and an exit surface radius of curvature R22 of 6.92 mm; Lens G3 has an incident surface radius of curvature R31 of 13.85 mm and an exit surface radius of curvature R32 of 7.18 mm; Lens G4 has an incident surface radius of curvature R41 of -8.09 mm and an exit surface radius of curvature R42 of 35.63 mm; Lens G5 has an incident surface radius of curvature R51 of 35.63 mm and an exit surface radius of curvature R52 of -10.56 mm; Lens G6 has an incident surface radius of curvature R61 of 49.72 mm. The radius of curvature of the exit surface of the seventh lens G7 is -53.98 mm; the radius of curvature of the incident surface of the eighth lens G8 is -42.36 mm, and the radius of curvature of the exit surface of the ninth lens G9 is -28.38 mm; the radius of curvature of the incident surface of the tenth lens G10 is 30.62 mm, and the radius of curvature of the exit surface of the eleventh lens G11 is -9.06 mm; the radius of curvature of the incident surface of the eleventh lens G11 is -9.06 mm, and the radius of curvature of the exit surface of the eleventh lens G11 is -101.81 mm.

[0286] In the first group of cemented lenses, the radius of curvature R11 of the incident surface of the first lens G1 and the radius of curvature R22 of the exit surface of the second lens G2 satisfy 2.3 < R11 / R22 < 2.4; in the second group of cemented lenses, the radius of curvature R41 of the incident surface of the fourth lens G4 and the radius of curvature R52 of the exit surface of the fifth lens G5 satisfy 0.7 < R41 / R52 < 0.8; in the third group of cemented lenses, the radius of curvature R101 of the incident surface of the tenth lens G10 and the radius of curvature R112 of the exit surface of the eleventh lens G11 satisfy 0.3 < |R101 / R112| < 0.4.

[0287] The center thicknesses of each lens are as follows: 1st lens G1, center thickness GT1 is 3.50mm; 2nd lens G2, center thickness GT2 is 1.05mm; 3rd lens G3, center thickness GT3 is 2.41mm; 4th lens G4, center thickness GT4 is 1.02mm; 5th lens G5, center thickness GT5 is 4.52mm; 6th lens G6, center thickness GT6 is 1.76mm; 7th lens G7, center thickness GT7 is 1.64mm; 8th lens G8, center thickness GT8 is 1.42mm; 9th lens G9, center thickness GT9 is 1.49mm; 10th lens G10, center thickness GT10 is 2.08mm; 11th lens G11, center thickness GT11 is 1.03mm.

[0288] In the first group of cemented lenses, the center thickness GT1 of the first lens G1 and the center thickness GT2 of the second lens G2 satisfy 3.3 < GT1 / GT2 < 3.4; in the second group of cemented lenses, the center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.2 < GT4 / GT5 < 0.3; in the third group of cemented lenses, the center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 2.0 < GT10 / GT11 < 2.1.

[0289] The air gaps between the lenses are as follows: the first lens G1 and the second lens G2 are cemented lenses; the air gap AT1 between the second lens G2 and the third lens G3 along the optical axis is 2.48 mm; the air gap AT2 between the third lens G3 and the fourth lens G4 along the optical axis is 3.44 mm; the fourth lens G4 and the fifth lens G5 are cemented lenses; the air gap AT3 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.16 mm; the air gap AT4 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0.07 mm; the seventh lens G... The air gap AT5 between aperture stop ST2 and the eighth lens G8 along the optical axis is 6.88 mm; the air gap AT6 between aperture stop ST2 and the eighth lens G8 along the optical axis is 1.68 mm; the air gap AT7 between the eighth lens G8 and the ninth lens G9 along the optical axis is 0.12 mm; the air gap AT8 between the ninth lens G9 and the tenth lens G10 along the optical axis is 0.25 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air gap BFL between the eleventh lens G11 and the image plane along the optical axis is 9.69 mm.

[0290] The air gap AT5 between the seventh lens G7 and the aperture stop ST2 along the optical axis and the air gap AT6 between the aperture stop ST2 and the eighth lens G8 along the optical axis satisfy 8.5 < AT5 + AT6 < 8.6.

[0291] The air gap distance BFL between the eleventh lens G11 and the image plane along the optical axis satisfies 0.20 < BFL / TTL2 < 0.21 with respect to the total optical length of the system TTL2.

[0292] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 23.8 mm; the focal length f2 of the second lens G2 is -12.7 mm; the focal length f3 of the third lens G3 is -33.3 mm; the focal length f4 of the fourth lens G4 is -8.6 mm; the focal length f5 of the fifth lens G5 is 15.9 mm; the focal length f6 of the sixth lens G6 is 26.4 mm; the focal length f7 of the seventh lens G7 is 37.7 mm; the focal length f8 of the eighth lens G8 is 40.6 mm; the focal length f9 of the ninth lens G9 is 33.8 mm; the focal length f10 of the tenth lens G10 is -84.7 mm; and the focal length f11 of the eleventh lens G11 is -42.7 mm.

[0293] The focal length f1 of the first lens G1 and the effective focal length fi of the imaging lens satisfy 2.6 < f1 / fi < 2.7; the focal length f2 of the second lens G2 and the effective focal length fi of the imaging lens satisfy 1.4 < |f2 / fi| < 1.5; the focal length f3 of the third lens G3 and the effective focal length fi of the imaging lens satisfy 3.65 < |f3 / fi| < 3.75; the focal length f4 of the fourth lens G4 and the effective focal length fi of the imaging lens satisfy 0.9 < |f4 / fi| < 1.0; the focal length f5 of the fifth lens G5 and the effective focal length fi of the imaging lens satisfy 1.7 < f5 / fi < 1.8; the focal length f6 of the sixth lens G6 and the effective focal length fi of the imaging lens satisfy 2.6 < f1 / fi < 2.7; the focal length f1 of the second lens G2 and the effective focal length fi of the imaging lens satisfy 1.4 < |f2 / fi| < 1.5; the focal length f3 of the third lens G3 and the effective focal length fi of the imaging lens satisfy 3.65 < |f3 / fi| < 3.75; the focal length f4 of the fourth lens G4 and the effective focal length fi of the imaging lens satisfy 0.9 < |f4 / fi| < 1.0; the focal length f5 of the fifth lens G5 and the effective focal length fi of the imaging lens satisfy 1.7 < f5 / fi < 1.8; the focal length f6 of the sixth lens G6 ... The following conditions must be met for i: 2.9 < f6 / fi < 3.0; the following conditions must be met for the focal length of the seventh lens G7 (f7) and the effective focal length of the imaging lens (fi): 4.1 < f7 / fi < 4.2; the following conditions must be met for the focal length of the eighth lens G8 (f8) and the effective focal length of the imaging lens (fi): 4.5 < f8 / fi < 4.6; the following conditions must be met for the focal length of the ninth lens G9 (f9) and the effective focal length of the imaging lens (fi): 3.7 < f9 / fi < 3.8; the following conditions must be met for the focal length of the tenth lens G10 (f10) and the effective focal length of the imaging lens (fi): 9.4 < |f10 / fi| < 9.5; and the following conditions must be met for the focal length of the eleventh lens G11 (f11) and the effective focal length of the imaging lens (fi): 4.7 < |f11 / fi| < 4.8.

[0294] The optical material parameters of each lens are as follows: Lens G1 has a refractive index N1 of 1.69 and an Abbe number V1 of 54.5; Lens G2 has a refractive index N2 of 1.52 and an Abbe number V2 of 52.1; Lens G3 has a refractive index N3 of 1.50 and an Abbe number V3 of 62.1; Lens G4 has a refractive index N4 of 1.85 and an Abbe number V4 of 23.8; Lens G5 has a refractive index N5 of 1.69 and an Abbe number V5 of 54.5; Lens G6 has a refractive index... The refractive index of the seventh lens G7 is 1.92, and the Abbe number V6 is 20.9; the refractive index of the eighth lens G8 is 1.81, and the Abbe number V7 is 40.9; the refractive index of the ninth lens G9 is 1.62, and the Abbe number V8 is 63.4; the refractive index of the tenth lens G10 is 1.59, and the Abbe number V10 is 68.3; the refractive index of the eleventh lens G11 is 1.85, and the Abbe number V11 is 23.8.

[0295] Example 2

[0296] In this disclosed example, the effective focal length f of the imaging lens is 11 mm, the aperture number Fno2 is F / 2.8, the half field of view is 22.5°, the image-side target size IMG2 is 8.81 mm, the operating wavelength is 400 nm to 700 nm, and the total optical length TTL2 of the system is 57.1 mm.

[0297] The effective focal length fi of the imaging lens and the image-side target size IMG2 satisfy the condition 1.24 < fi / IMG2 < 1.25.

[0298] The focal length fa2 of the front lens group L1 is -21.55mm, the focal length fb2 of the middle lens group L2 is 19.18mm, and the focal length fc2 of the rear lens group L3 is 23.34mm. The axial distance d12 between the front lens group L1 and the middle lens group L2 is 4.20mm, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 is 10.46mm.

[0299] The focal length fa2 of the front lens group L1 and the effective focal length fi of the imaging lens satisfy 1.95 < |fa2 / fi| < 1.96. The focal length fb2 of the middle lens group L2 and the effective focal length fi of the imaging lens satisfy 1.74 < fb2 / fi < 1.75. The focal length fc2 of the rear lens group L3 and the effective focal length fi of the imaging lens satisfy 2.12 < fc2 / fi < 2.13. The axial distance d12 between the front lens group L1 and the middle lens group L2, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 satisfy 0.40 < d12 / d23 < 0.41.

[0300] The radii of curvature of each lens are as follows: Lens G1 has an incident surface radius of curvature R11 of 19.73 mm and an exit surface radius of curvature R12 of 107.27 mm; Lens G2 has an incident surface radius of curvature R21 of 107.27 mm and an exit surface radius of curvature R22 of 8.46 mm; Lens G3 has an incident surface radius of curvature R31 of 16.93 mm and an exit surface radius of curvature R32 of 8.78 mm; Lens G4 has an incident surface radius of curvature R41 of -9.88 mm and an exit surface radius of curvature R42 of 43.55 mm; Lens G5 has an incident surface radius of curvature R51 of 43.55 mm and an exit surface radius of curvature R52 of -12.90 mm; Lens G6 has an incident surface radius of curvature R61 of 60.77 mm. The radius of curvature of the exit surface of the seventh lens G7 is -65.97 mm; the radius of curvature of the incident surface of the eighth lens G8 is -51.77 mm, and the radius of curvature of the exit surface of the ninth lens G9 is -34.69 mm; the radius of curvature of the incident surface of the tenth lens G10 is 37.42 mm, and the radius of curvature of the exit surface of the eleventh lens G11 is -11.07 mm; the radius of curvature of the incident surface of the eleventh lens G11 is -11.07 mm, and the radius of curvature of the exit surface of the eleventh lens G11 is -124.43 mm.

[0301] In the first group of cemented lenses, the radius of curvature R11 of the incident surface of the first lens G1 and the radius of curvature R22 of the exit surface of the second lens G2 satisfy 2.3 < R11 / R22 < 2.4; in the second group of cemented lenses, the radius of curvature R41 of the incident surface of the fourth lens G4 and the radius of curvature R52 of the exit surface of the fifth lens G5 satisfy 0.7 < R41 / R52 < 0.8; in the third group of cemented lenses, the radius of curvature R101 of the incident surface of the tenth lens G10 and the radius of curvature R112 of the exit surface of the eleventh lens G11 satisfy 0.3 < |R101 / R112| < 0.4.

[0302] The center thicknesses of each lens are as follows: 1st lens G1, center thickness GT1 is 4.30mm; 2nd lens G2, center thickness GT2 is 1.28mm; 3rd lens G3, center thickness GT3 is 2.94mm; 4th lens G4, center thickness GT4 is 1.24mm; 5th lens G5, center thickness GT5 is 5.52mm; 6th lens G6, center thickness GT6 is 2.15mm; 7th lens G7, center thickness GT7 is 2.00mm; 8th lens G8, center thickness GT8 is 1.74mm; 9th lens G9, center thickness GT9 is 1.82mm; 10th lens G10, center thickness GT10 is 2.54mm; 11th lens G11, center thickness GT11 is 1.26mm.

[0303] In the first group of cemented lenses, the center thickness GT1 of the first lens G1 and the center thickness GT2 of the second lens G2 satisfy 3.3 < GT1 / GT2 < 3.4; in the second group of cemented lenses, the center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.2 < GT4 / GT5 < 0.3; in the third group of cemented lenses, the center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 2.0 < GT10 / GT11 < 2.1.

[0304] The air gaps between the lenses are as follows: the first lens G1 and the second lens G2 are cemented lenses; the air gap AT1 between the second lens G2 and the third lens G3 along the optical axis is 3.03 mm; the air gap AT2 between the third lens G3 and the fourth lens G4 along the optical axis is 4.20 mm; the fourth lens G4 and the fifth lens G5 are cemented lenses; the air gap AT3 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.19 mm; the air gap AT4 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0.09 mm; the seventh lens G... The air gap AT5 between aperture stop ST2 and the eighth lens G8 along the optical axis is 8.41 mm; the air gap AT6 between aperture stop ST2 and the eighth lens G8 along the optical axis is 2.06 mm; the air gap AT7 between the eighth lens G8 and the ninth lens G9 along the optical axis is 0.15 mm; the air gap AT8 between the ninth lens G9 and the tenth lens G10 along the optical axis is 0.31 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air gap BFL between the eleventh lens G11 and the image plane along the optical axis is 11.84 mm.

[0305] The air gap AT5 between the seventh lens G7 and the aperture stop ST2 along the optical axis and the air gap AT6 between the aperture stop ST2 and the eighth lens G8 along the optical axis satisfy 10.4 < AT5 + AT6 < 10.5.

[0306] The air gap distance BFL between the eleventh lens G11 and the image plane along the optical axis satisfies 0.20 < BFL / TTL2 < 0.21 with respect to the total optical length of the system TTL2.

[0307] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 29.1 mm; the focal length f2 of the second lens G2 is -15.5 mm; the focal length f3 of the third lens G3 is -40.7 mm; the focal length f4 of the fourth lens G4 is -10.5 mm; the focal length f5 of the fifth lens G5 is 19.5 mm; the focal length f6 of the sixth lens G6 is 32.3 mm; the focal length f7 of the seventh lens G7 is 46.1 mm; the focal length f8 of the eighth lens G8 is 49.6 mm; the focal length f9 of the ninth lens G9 is 41.3 mm; the focal length f10 of the tenth lens G10 is -103.5 mm; and the focal length f11 of the eleventh lens G11 is -52.2 mm.

[0308] The focal length f1 of the first lens G1 and the effective focal length fi of the imaging lens satisfy 2.6 < f1 / fi < 2.7; the focal length f2 of the second lens G2 and the effective focal length fi of the imaging lens satisfy 1.4 < |f2 / fi| < 1.5; the focal length f3 of the third lens G3 and the effective focal length fi of the imaging lens satisfy 3.65 < |f3 / fi| < 3.75; the focal length f4 of the fourth lens G4 and the effective focal length fi of the imaging lens satisfy 0.9 < |f4 / fi| < 1.0; the focal length f5 of the fifth lens G5 and the effective focal length fi of the imaging lens satisfy 1.7 < f5 / fi < 1.8; the focal length f6 of the sixth lens G6 and the effective focal length fi of the imaging lens satisfy 2.6 < f1 / fi < 2.7; the focal length f1 of the second lens G2 and the effective focal length fi of the imaging lens satisfy 1.4 < |f2 / fi| < 1.5; the focal length f3 of the third lens G3 and the effective focal length fi of the imaging lens satisfy 3.65 < |f3 / fi| < 3.75; the focal length f4 of the fourth lens G4 and the effective focal length fi of the imaging lens satisfy 0.9 < |f4 / fi| < 1.0; the focal length f5 of the fifth lens G5 and the effective focal length fi of the imaging lens satisfy 1.7 < f5 / fi < 1.8; the focal length f6 of the sixth lens G6 ... The following conditions must be met for i: 2.9 < f6 / fi < 3.0; the following conditions must be met for the focal length of the seventh lens G7 (f7) and the effective focal length of the imaging lens (fi): 4.1 < f7 / fi < 4.2; the following conditions must be met for the focal length of the eighth lens G8 (f8) and the effective focal length of the imaging lens (fi): 4.5 < f8 / fi < 4.6; the following conditions must be met for the focal length of the ninth lens G9 (f9) and the effective focal length of the imaging lens (fi): 3.7 < f9 / fi < 3.8; the following conditions must be met for the focal length of the tenth lens G10 (f10) and the effective focal length of the imaging lens (fi): 9.4 < |f10 / fi| < 9.5; and the following conditions must be met for the focal length of the eleventh lens G11 (f11) and the effective focal length of the imaging lens (fi): 4.7 < |f11 / fi| < 4.8.

[0309] The optical material parameters of each lens are as follows: Lens G1 has a refractive index N1 of 1.69 and an Abbe number V1 of 54.5; Lens G2 has a refractive index N2 of 1.52 and an Abbe number V2 of 52.1; Lens G3 has a refractive index N3 of 1.50 and an Abbe number V3 of 62.1; Lens G4 has a refractive index N4 of 1.85 and an Abbe number V4 of 23.8; Lens G5 has a refractive index N5 of 1.69 and an Abbe number V5 of 54.5; Lens G6 has a refractive index... The refractive index of the seventh lens G7 is 1.92, and the Abbe number V6 is 20.9; the refractive index of the eighth lens G8 is 1.81, and the Abbe number V7 is 40.9; the refractive index of the ninth lens G9 is 1.62, and the Abbe number V8 is 63.4; the refractive index of the tenth lens G10 is 1.59, and the Abbe number V10 is 68.3; the refractive index of the eleventh lens G11 is 1.85, and the Abbe number V11 is 23.8.

[0310] Example 3

[0311] In this disclosed example, the effective focal length f of the imaging lens is 13mm, the aperture number Fno2 is F / 2.8, the half field of view is 22.5°, the image target size IMG2 is 10.4mm, the working wavelength is 400nm~700nm, and the total optical length TTL2 of the system is 67.5mm.

[0312] The effective focal length fi of the imaging lens and the image-side target size IMG2 satisfy the condition 1.24 < fi / IMG2 < 1.25.

[0313] The focal length fa2 of the front lens group L1 is -25.47mm, the focal length fb2 of the middle lens group L2 is 22.67mm, and the focal length fc2 of the rear lens group L3 is 27.58mm. The axial distance d12 between the front lens group L1 and the middle lens group L2 is 4.97mm, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 is 12.37mm.

[0314] The focal length fa2 of the front lens group L1 and the effective focal length fi of the imaging lens satisfy 1.95 < |fa2 / fi| < 1.96. The focal length fb2 of the middle lens group L2 and the effective focal length fi of the imaging lens satisfy 1.74 < fb2 / fi < 1.75. The focal length fc2 of the rear lens group L3 and the effective focal length fi of the imaging lens satisfy 2.12 < fc2 / fi < 2.13. The axial distance d12 between the front lens group L1 and the middle lens group L2, and the axial distance d23 between the middle lens group L2 and the rear lens group L3 satisfy 0.40 < d12 / d23 < 0.41.

[0315] The radii of curvature of each lens are as follows: Lens G1 has an incident surface radius of curvature R11 of 23.32 mm and an exit surface radius of curvature R12 of 126.77 mm; Lens G2 has an incident surface radius of curvature R21 of 126.77 mm and an exit surface radius of curvature R22 of 10.00 mm; Lens G3 has an incident surface radius of curvature R31 of 20.01 mm and an exit surface radius of curvature R32 of 10.37 mm; Lens G4 has an incident surface radius of curvature R41 of -11.68 mm and an exit surface radius of curvature R42 of 51.46 mm; Lens G5 has an incident surface radius of curvature R51 of 51.46 mm and an exit surface radius of curvature R52 of -15.25 mm; Lens G6 has an incident surface radius of curvature R61 of 71.82 mm. The radius of curvature of the incident surface of the seventh lens G7 is 51.84 mm, and the radius of curvature of the exit surface is -354.08 mm; the radius of curvature of the incident surface of the eighth lens G8 is -61.18 mm, and the radius of curvature of the exit surface is -23.36 mm; the radius of curvature of the incident surface of the ninth lens G9 is 102.80 mm, and the radius of curvature of the exit surface is -41.00 mm; the radius of curvature of the incident surface of the tenth lens G10 is 44.22 mm, and the radius of curvature of the exit surface is -13.08 mm; the radius of curvature of the incident surface of the eleventh lens G11 is -13.08 mm, and the radius of curvature of the exit surface is -147.06 mm.

[0316] In the first group of cemented lenses, the radius of curvature R11 of the incident surface of the first lens G1 and the radius of curvature R22 of the exit surface of the second lens G2 satisfy 2.3 < R11 / R22 < 2.4; in the second group of cemented lenses, the radius of curvature R41 of the incident surface of the fourth lens G4 and the radius of curvature R52 of the exit surface of the fifth lens G5 satisfy 0.7 < R41 / R52 < 0.8; in the third group of cemented lenses, the radius of curvature R101 of the incident surface of the tenth lens G10 and the radius of curvature R112 of the exit surface of the eleventh lens G11 satisfy 0.3 < |R101 / R112| < 0.4.

[0317] The center thicknesses of each lens are as follows: 1st lens G1, center thickness GT1 is 5.08mm; 2nd lens G2, center thickness GT2 is 1.51mm; 3rd lens G3, center thickness GT3 is 3.48mm; 4th lens G4, center thickness GT4 is 1.47mm; 5th lens G5, center thickness GT5 is 6.53mm; 6th lens G6, center thickness GT6 is 2.54mm; 7th lens G7, center thickness GT7 is 2.37mm; 8th lens G8, center thickness GT8 is 2.06mm; 9th lens G9, center thickness GT9 is 2.15mm; 10th lens G10, center thickness GT10 is 3.00mm; 11th lens G11, center thickness GT11 is 1.49mm.

[0318] In the first group of cemented lenses, the center thickness GT1 of the first lens G1 and the center thickness GT2 of the second lens G2 satisfy 3.3 < GT1 / GT2 < 3.4; in the second group of cemented lenses, the center thickness GT4 of the fourth lens G4 and the center thickness GT5 of the fifth lens G5 satisfy 0.2 < GT4 / GT5 < 0.3; in the third group of cemented lenses, the center thickness GT10 of the tenth lens G10 and the center thickness GT11 of the eleventh lens G11 satisfy 2.0 < GT10 / GT11 < 2.1.

[0319] The air gaps between the lenses are as follows: the first lens G1 and the second lens G2 are cemented lenses; the air gap AT1 between the second lens G2 and the third lens G3 along the optical axis is 3.58 mm; the air gap AT2 between the third lens G3 and the fourth lens G4 along the optical axis is 4.97 mm; the fourth lens G4 and the fifth lens G5 are cemented lenses; the air gap AT3 between the fifth lens G5 and the sixth lens G6 along the optical axis is 0.23 mm; the air gap AT4 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0.11 mm; the seventh lens G... The air gap AT5 between aperture stop ST2 and the eighth lens G8 along the optical axis is 9.94 mm; the air gap AT6 between aperture stop ST2 and the eighth lens G8 along the optical axis is 2.43 mm; the air gap AT7 between the eighth lens G8 and the ninth lens G9 along the optical axis is 0.18 mm; the air gap AT8 between the ninth lens G9 and the tenth lens G10 along the optical axis is 0.37 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air gap BFL between the eleventh lens G11 and the image plane along the optical axis is 13.99 mm.

[0320] The air gap AT5 between the seventh lens G7 and the aperture stop ST2 along the optical axis and the air gap AT6 between the aperture stop ST2 and the eighth lens G8 along the optical axis satisfy 12.3 < AT5 + AT6 < 12.4.

[0321] The air gap distance BFL between the eleventh lens G11 and the image plane along the optical axis satisfies 0.20 < BFL / TTL2 < 0.21 with respect to the total optical length of the system TTL2.

[0322] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 34.3 mm; the focal length f2 of the second lens G2 is -18.3 mm; the focal length f3 of the third lens G3 is -48.1 mm; the focal length f4 of the fourth lens G4 is -12.4 mm; the focal length f5 of the fifth lens G5 is 23.0 mm; the focal length f6 of the sixth lens G6 is 38.2 mm; the focal length f7 of the seventh lens G7 is 54.4 mm; the focal length f8 of the eighth lens G8 is 58.7 mm; the focal length f9 of the ninth lens G9 is 48.8 mm; the focal length f10 of the tenth lens G10 is -122.3 mm; and the focal length f11 of the eleventh lens G11 is -61.7 mm.

[0323] The focal length f1 of the first lens G1 and the effective focal length fi of the imaging lens satisfy 2.6 < f1 / fi < 2.7; the focal length f2 of the second lens G2 and the effective focal length fi of the imaging lens satisfy 1.4 < |f2 / fi| < 1.5; the focal length f3 of the third lens G3 and the effective focal length fi of the imaging lens satisfy 3.65 < |f3 / fi| < 3.75; the focal length f4 of the fourth lens G4 and the effective focal length fi of the imaging lens satisfy 0.9 < |f4 / fi| < 1.0; the focal length f5 of the fifth lens G5 and the effective focal length fi of the imaging lens satisfy 1.7 < f5 / fi < 1.8; the focal length f6 of the sixth lens G6 and the effective focal length fi of the imaging lens satisfy 2.6 < f1 / fi < 2.7; the focal length f1 of the second lens G2 and the effective focal length fi of the imaging lens satisfy 1.4 < |f2 / fi| < 1.5; the focal length f3 of the third lens G3 and the effective focal length fi of the imaging lens satisfy 3.65 < |f3 / fi| < 3.75; the focal length f4 of the fourth lens G4 and the effective focal length fi of the imaging lens satisfy 0.9 < |f4 / fi| < 1.0; the focal length f5 of the fifth lens G5 and the effective focal length fi of the imaging lens satisfy 1.7 < f5 / fi < 1.8; the focal length f6 of the sixth lens G6 ... The following conditions must be met for i: 2.9 < f6 / fi < 3.0; the following conditions must be met for the focal length of the seventh lens G7 (f7) and the effective focal length of the imaging lens (fi): 4.1 < f7 / fi < 4.2; the following conditions must be met for the focal length of the eighth lens G8 (f8) and the effective focal length of the imaging lens (fi): 4.5 < f8 / fi < 4.6; the following conditions must be met for the focal length of the ninth lens G9 (f9) and the effective focal length of the imaging lens (fi): 3.7 < f9 / fi < 3.8; the following conditions must be met for the focal length of the tenth lens G10 (f10) and the effective focal length of the imaging lens (fi): 9.4 < |f10 / fi| < 9.5; and the following conditions must be met for the focal length of the eleventh lens G11 (f11) and the effective focal length of the imaging lens (fi): 4.7 < |f11 / fi| < 4.8.

[0324] The optical material parameters of each lens are as follows: Lens G1 has a refractive index N1 of 1.69 and an Abbe number V1 of 54.5; Lens G2 has a refractive index N2 of 1.52 and an Abbe number V2 of 52.1; Lens G3 has a refractive index N3 of 1.50 and an Abbe number V3 of 62.1; Lens G4 has a refractive index N4 of 1.85 and an Abbe number V4 of 23.8; Lens G5 has a refractive index N5 of 1.69 and an Abbe number V5 of 54.5; Lens G6 has a refractive index... The refractive index of the seventh lens G7 is 1.92, and the Abbe number V6 is 20.9; the refractive index of the eighth lens G8 is 1.81, and the Abbe number V7 is 40.9; the refractive index of the ninth lens G9 is 1.62, and the Abbe number V8 is 63.4; the refractive index of the tenth lens G10 is 1.59, and the Abbe number V10 is 68.3; the refractive index of the eleventh lens G11 is 1.85, and the Abbe number V11 is 23.8.

[0325] Example 3

[0326] Combination Figure 1 This disclosure also provides a projection system, which includes: a pattern generation module and a projection lens of Embodiment 1. The pattern generation module generates a projection pattern, and the projection lens is used to project the projection pattern onto the surface of the object being measured.

[0327] The structure, function, and effect of the projection lens provided in this embodiment are the same as those in Embodiment 1 above. For details, please refer to Embodiment 1 above, and it will not be repeated here.

[0328] The pattern generation module and the projection lens are provided with an equivalent prism 11, a cover glass 12 and a DMD chip, and the DMD chip forms the image source surface 13.

[0329] The pattern generation module may also include a light source and a light-diffusing unit and a reflector disposed between the light source and the equivalent prism, which will not be described in detail here. The projection lens of this embodiment can be adapted to different types of light sources, wherein the light source may be an LED array, a laser diode, etc.

[0330] Example 4

[0331] This disclosure also discloses an electronic device, including: an imaging lens, an image sensor, and a projection system provided in Embodiment 3, the projection system being used to project a pattern toward the surface of the object being measured;

[0332] The light reflected from the surface of the object being measured passes through the imaging lens and forms a detection image on the image sensor.

[0333] This disclosure also provides an electronic device that includes the projection lens provided in Embodiment 1.

[0334] This disclosure also provides an electronic device that includes the imaging lens provided in Embodiment 2.

[0335] This disclosure also provides an electronic device, which includes a projection lens provided in Embodiment 1 and an imaging lens provided in Embodiment 2.

[0336] The structure, function, and effect of the projection lens and imaging lens in the electronic device provided in this embodiment are the same as those in the above embodiments. Specific details can be found in the above embodiments and will not be repeated here. Therefore, the electronic device of this disclosure embodiment also has the same advantages as the above embodiments.

[0337] In the above description, the use of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0338] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A projection lens, characterized in that, include: Along the optical axis, a first lens group, an aperture stop, and a second lens group are sequentially arranged from the projection surface to the image source surface; wherein, the projection surface is used to display the projected image; and the image source surface is used to display the image to be projected. The first lens group has negative optical power, and the second lens group has positive optical power; The first lens group consists of a first lens, a first sub-lens group, and a front aperture lens arranged sequentially along the optical axis from the projection surface to the image source surface; the first sub-lens group includes at least one lens with negative optical power; wherein, the first lens has positive optical power, the first sub-lens group has negative optical power, and the front aperture lens has positive optical power. The second lens group consists of an aperture rear lens and a second sub-lens group arranged sequentially along the optical axis from the projection surface to the image source surface; the second sub-lens group includes a set of cemented lenses with positive optical power, the second sub-lens group has positive optical power, and the aperture rear lens has negative optical power; The focusing range of the projection lens is greater than or equal to 500mm; The distortion curve of the projection lens exhibits a monotonic variation across the entire field of view; The contrast ratio of the MTF in each field of view of the projection lens is greater than 0.7 at a spatial frequency of 93 cycles / mm. The relative illumination of the projection lens across the entire field of view is greater than 96%.

2. The projection lens according to claim 1, characterized in that, The projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the projection surface to the image source surface; The aperture stop is located between the fifth lens and the sixth lens, the fifth lens being the front lens of the aperture stop and the sixth lens being the rear lens of the aperture stop; The second lens, the third lens, and the fourth lens form the first sub-lens group; The seventh and eighth lenses are cemented lenses; the seventh, eighth, ninth, and tenth lenses form the second sub-lens group; The second lens, the third lens, and the fourth lens each have negative optical power; the seventh lens has negative optical power; and the eighth lens, the ninth lens, and the tenth lens each have positive optical power.

3. The projection lens according to claim 2, characterized in that, The first lens, the second lens, the third lens, and the fourth lens are convex and concave lenses, respectively; the fifth lens is a biconvex lens; the sixth lens is a convex and concave lens; the seventh lens is a plano-concave lens; and the eighth, ninth, and tenth lenses are biconvex lenses, respectively.

4. The projection lens according to claim 2, characterized in that, The first lens has a projection-side surface radius of curvature R011 of 20.8 mm to 33.8 mm and an image-source-side surface radius of curvature R012 of 49 mm to 73.5 mm; the second lens has a projection-side surface radius of curvature R021 of 11.9 mm to 19.6 mm and an image-source-side surface radius of curvature R022 of 6.3 mm to 11.6 mm; and the third lens has a projection-side surface radius of curvature R031 of 19.3 mm to 26.5 mm. The radius of curvature R032 of the image source side surface is 6.54mm to 10.7mm; the radius of curvature R041 of the projection side surface of the fourth lens is 16.57mm to 425mm, and the radius of curvature R042 of the image source side surface is 6.76mm to 13.4mm; the radius of curvature R051 of the projection side surface of the fifth lens is 15mm to 32.7mm, and the radius of curvature R052 of the image source side surface is -83.3mm to -57.6mm; the sixth... The seventh lens has a projection-side surface radius of curvature R061 of 77.4 mm to 209 mm and an image-source-side surface radius of curvature R062 of 14.6 mm to 29 mm; the seventh lens has a projection-side surface radius of curvature R071 greater than or equal to 566 mm and an image-source-side surface radius of curvature R072 of 11.65 mm to 23.2 mm; the eighth lens has a projection-side surface radius of curvature R081 of 11.65 mm to 23.2 mm and an image-source-side surface radius of curvature R062 of 14.6 mm to 29 mm. The radius of curvature R082 of the surface is -23.5mm to -11.65mm; the radius of curvature R091 of the projection side surface of the ninth lens is 31.1mm to 63.5mm, and the radius of curvature R092 of the image source side surface is -47.3mm to -31.1mm; the radius of curvature R0101 of the projection side surface of the tenth lens is 17.4mm to 29.8mm, and the radius of curvature R0102 of the image source side surface is -55.5mm to -26.4mm.

5. The projection lens according to claim 2, characterized in that, The center thickness of the first lens GT01 is 2.8mm to 5mm; the center thickness of the second lens GT02 is 1.64mm to 2.9mm; the center thickness of the third lens GT03 is 1.64mm to 2.9mm; the center thickness of the fourth lens GT04 is 1.49mm to 2.7mm; the center thickness of the fifth lens GT05 is 1.51mm to 2.7mm; the center thickness of the sixth lens GT06 is 1.5mm to 2.7mm; the center thickness of the seventh lens GT07 is 1.5mm to 2.7mm; the center thickness of the eighth lens GT08 is 3mm to 4.8mm; the center thickness of the ninth lens GT09 is 2mm to 3.7mm; and the center thickness of the tenth lens GT010 is 2.7mm to 4.8mm.

6. The projection lens according to claim 2, characterized in that, The air gap AT01 between the first lens and the second lens along the optical axis is 0.15mm to 0.27mm; the air gap AT02 between the second lens and the third lens along the optical axis is 2.7mm to 3.6mm; the air gap AT03 between the third lens and the fourth lens along the optical axis is 2.1mm to 3.8mm; the air gap AT04 between the fourth lens and the fifth lens along the optical axis is 4.4mm to 8mm; and the air gap AT05 between the fifth lens and the aperture stop along the optical axis is 1mm. The aperture stop and the sixth lens are 6mm to 3.1mm apart; the air gap AT06 between the aperture stop and the sixth lens along the optical axis is 1mm to 3.3mm; the air gap AT07 between the sixth lens and the seventh lens along the optical axis is 0.69mm to 1.2mm; the seventh lens and the eighth lens are cemented lenses; the air gap AT08 between the eighth lens and the ninth lens along the optical axis is 0.2mm to 0.27mm; the air gap AT09 between the ninth lens and the tenth lens along the optical axis is 0.2mm to 0.27mm.

7. The projection lens according to claim 2, characterized in that, The focal length f01 of the first lens is 44mm to 77mm; the focal length f02 of the second lens is -40mm to -20mm; the focal length f03 of the third lens is -38mm to -16mm; the focal length f04 of the fourth lens is -30mm to -23mm; the focal length f05 of the fifth lens is 13.5mm to 25mm; the focal length f06 of the sixth lens is -46mm to -20.4mm; the focal length f07 of the seventh lens is -25mm to -13mm; the focal length f08 of the eighth lens is 10.2mm to 21mm; the focal length f09 of the ninth lens is 20.5mm to 34mm; and the focal length f010 of the tenth lens is 17mm to 30mm.

8. The projection lens according to claim 2, characterized in that, The first lens has a refractive index (NO1) of 1.73–1.75 and an Abbe number (V01) of 52.3; the second lens has a refractive index (NO2) of 1.75–1.81 and an Abbe number (V02) of 46.2–52.3; the third lens has a refractive index (NO3) of 1.64–1.71 and an Abbe number (V03) of 54.8–60; the fourth lens has a refractive index (NO4) of 1.50–1.52 and an Abbe number (V04) of 64.2–81.6; and the fifth lens has a refractive index (NO5) of 1.85–1.91 and an Abbe number (V05) of 23.8–2. 7; The refractive index N06 of the sixth lens is 1.72–1.85, and the Abbe number V06 is 23.8–24.9; the refractive index N07 of the seventh lens is 1.85–1.91, and the Abbe number V07 is 22.9–23.8; the refractive index N08 of the eighth lens is 1.57–1.59, and the Abbe number V08 is 68.3–68.8; the refractive index N09 of the ninth lens is 1.75–1.78, and the Abbe number V09 is 52.3; the refractive index N010 of the tenth lens is 1.62, and the Abbe number V010 is 60.

3.

9. The projection lens according to any one of claims 1-8, characterized in that, The effective focal length fp of the projection lens is 5mm to 10mm, the aperture number Fno1 is F / 1.7 to F / 4, the image target size IMG1 is 6mm to 11mm, the working wavelength is 435nm to 680nm, the total optical length TTL1 of the projection lens system is 46mm to 82mm, and the system back focal length BFL1 is 13.5mm to 24mm.

10. The projection lens according to any one of claims 1-8, characterized in that, The focal length fa1 of the first lens group is -240mm to -179mm, the focal length fb1 of the second lens group is 8.82mm to 160mm, and the focal length fc1 of the first sub-lens group is -40mm to -20mm. The axial distance d012 between the first lens group and the second lens group is 2.7mm to 6.4mm.

11. The projection lens according to any one of claims 1-8, characterized in that, The focal length fa1 of the first lens group and the effective focal length fp of the projection lens satisfy |fa1 / fp|=19~35; the focal length fb1 of the second lens group and the effective focal length fp of the projection lens satisfy fb1 / fp=1.6~1.8; The focal length fc1 of the first sub-lens group and the effective focal length fp of the projection lens satisfy |fc1 / fp|=4~4.

5.

12. The projection lens according to any one of claims 1-8, characterized in that, All lenses are made of glass, and all lenses are spherical lenses.

13. A projection system, characterized in that, include: The pattern generation module and the projection lens according to any one of claims 1-12, wherein the pattern generation module generates a projection pattern and the projection lens is used to project the projection pattern onto the surface of the object being measured.

14. An electronic device, comprising: An imaging lens, an image sensor, and a projection system as described in claim 13, the projection system being used to project a pattern toward the surface of an object being measured; The light reflected from the surface of the object being measured passes through the imaging lens and forms a detection image on the image sensor.

15. The electronic device according to claim 14, characterized in that, The imaging lens includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged coaxially from the object side to the image side; an aperture stop is provided between the seventh lens and the eighth lens; The first lens has positive optical power; the second lens has negative optical power; the third lens has negative optical power; the fourth lens has negative optical power; the fifth lens has positive optical power; the sixth lens has positive optical power; the seventh lens has positive optical power; the eighth lens has positive optical power; the ninth lens has positive optical power; and the tenth and eleventh lenses each have negative optical power. The first lens is a convex-concave lens, the second lens is a convex-concave lens, the first and second lenses are cemented lenses, the third lens is a convex-concave lens, the fourth lens is a biconcave lens, the fifth lens is a biconvex lens, the fourth and fifth lenses are cemented lenses, the sixth lens is a biconvex lens, the seventh lens is a biconvex lens, the eighth lens is a concave-convex lens, the ninth lens is a biconvex lens, the tenth lens is a biconvex lens, the eleventh lens is a concave-convex lens, and the tenth and eleventh lenses are cemented lenses; the effective focal length fi of the imaging lens is 8mm to 14mm, and the operating wavelength is 400nm to 700nm.

16. The electronic device according to claim 15, characterized in that, The first lens has a refractive index N1 of 1.65–1.70 and an Abbe number V1 of 54.5–55; the second lens has a refractive index N2 of 1.50–1.55 and an Abbe number V2 of 52.0–52.5; the third lens has a refractive index N3 of 1.50–1.55 and an Abbe number V3 of 62.0–62.5; the fourth lens has a refractive index N4 of 1.85–1.90 and an Abbe number V4 of 23.5–24.0; the fifth lens has a refractive index N5 of 1.65–1.70 and an Abbe number V5 of 54.5–55.0; and the sixth lens has a refractive index N6 of 1.90–1.

95. The refractive index of the seventh lens is 1.80–1.85, and the Abbe number V7 is 40.5–41.0; the refractive index of the eighth lens is 1.60–1.65, and the Abbe number V8 is 63.0–63.5; the refractive index of the ninth lens is 1.55–1.60, and the Abbe number is 68.0–68.5; the refractive index of the tenth lens is 1.55–1.60, and the Abbe number V10 is 68.0–68.5; the refractive index of the eleventh lens is 1.85–1.90, and the Abbe number V11 is 23.5–24.

0.

17. The electronic device according to claim 15, characterized in that, The first lens, the second lens, and the third lens form a front lens group; The fourth lens, the fifth lens, the sixth lens, and the seventh lens form a lens group; The eighth lens, the ninth lens, the tenth lens, and the eleventh lens form a rear lens group; The front lens group has negative optical power; the middle lens group and the rear lens group each have positive optical power.

18. The electronic device according to claim 17, characterized in that, The focal length fa2 of the front lens group is -30mm to -15mm; The focal length fb2 of the middle lens group is 12mm to 27mm; The focal length fc2 of the rear lens group is 15mm to 30mm; The axial distance d12 between the front lens group and the middle lens group is 2mm to 7mm; the axial distance d23 between the middle lens group and the rear lens group is 6mm to 15mm.

19. The electronic device according to claim 17, characterized in that, The focal length fa2 of the front lens group and the effective focal length fi of the imaging lens satisfy 1.95 < |fa2 / fi| < 1.96; the focal length fb2 of the middle lens group and the effective focal length fi of the imaging lens satisfy 1.74 < fb2 / fi < 1.75; and the focal length fc2 of the rear lens group and the effective focal length fi of the imaging lens satisfy 2.12 < fc2 / fi < 2.

13. The axial distance d12 between the front lens group and the middle lens group and the axial distance d23 between the middle lens group and the rear lens group satisfy 0.4 < d12 / d23 < 0.

41.

20. The electronic device according to claim 15, characterized in that, The first lens has an incident surface radius of curvature R11 of 16.1 mm to 23.4 mm and an exit surface radius of curvature R12 of 87.7 mm to 126.8 mm; the second lens has an incident surface radius of curvature R21 of 87.7 mm to 126.8 mm and an exit surface radius of curvature R22 of 6.9 mm to 10.0 mm; the third lens has an incident surface radius of curvature R31 of 13.8 mm to 20.1 mm and an exit surface radius of curvature R32 of 7.1 mm. The radius of curvature of the incident surface of the fourth lens is -11.6mm to -8.0mm, and the radius of curvature of the exit surface is 35.6mm to 51.5mm; the radius of curvature of the incident surface of the fifth lens is 35.6mm to 51.5mm, and the radius of curvature of the exit surface is -15.3mm to -10.5mm; the radius of curvature of the incident surface of the sixth lens is 49.7mm to 71.9mm, and the radius of curvature of the exit surface is -11.6mm to -8.0mm. The radius of curvature R62 of the seventh lens is -78.0mm to -53.9mm; the radius of curvature R71 of the incident surface of the seventh lens is 35.8mm to 51.9mm, and the radius of curvature R72 of the exit surface is -354.1mm to -245.1mm; the radius of curvature R81 of the incident surface of the eighth lens is -61.2mm to -42.3mm, and the radius of curvature R82 of the exit surface is -23.4mm to -16.1mm; the radius of curvature R91 of the incident surface of the ninth lens is 71mm. The radius of curvature of the incident surface of the tenth lens is 1mm to 102.9mm, and the radius of curvature of the exit surface R92 is -41.0mm to -28.3mm; the radius of curvature of the incident surface of the eleventh lens is 30.6mm to 44.3mm, and the radius of curvature of the exit surface R102 is -13.1mm to -9.0mm; the radius of curvature of the incident surface of the eleventh lens is -13.1mm to -9.0mm, and the radius of curvature of the exit surface R112 is -147.1mm to -101.8mm.

21. The electronic device according to claim 20, characterized in that, The radius of curvature R11 of the incident surface of the first lens and the radius of curvature R22 of the exit surface of the second lens satisfy 1.6 < R11 / R22 < 3.

4. The radius of curvature R41 of the incident surface of the fourth lens and the radius of curvature R52 of the exit surface of the fifth lens satisfy 0.5 < R41 / R52 < 1.

2. The radius of curvature R101 of the incident surface of the tenth lens and the radius of curvature R112 of the exit surface of the eleventh lens satisfy 0.2 < |R101 / R112| < 0.

5.

22. The electronic device according to claim 15, characterized in that, The center thickness GT1 of the first lens is 3.5mm to 5.1mm; the center thickness GT2 of the second lens is 1.0mm to 1.6mm; the center thickness GT3 of the third lens is 2.4mm to 3.5mm; the center thickness GT4 of the fourth lens is 1.0mm to 1.5mm; the center thickness GT5 of the fifth lens is 4.5mm to 6.6mm; the center thickness GT6 of the sixth lens is 1.7mm to 2.6mm; the center thickness GT7 of the seventh lens is 1.6mm to 2.4mm; the center thickness GT8 of the eighth lens is 1.4mm to 2.1mm; the center thickness GT9 of the ninth lens is 1.4mm to 2.2mm; the center thickness GT10 of the tenth lens is 2.0mm to 3.1mm; and the center thickness GT11 of the eleventh lens is 1.0mm to 1.5mm.

23. The electronic device according to claim 22, characterized in that, The center thickness GT1 of the first lens and the center thickness GT2 of the second lens satisfy 2.1 < GT1 / GT2 < 5.1; The center thickness GT4 of the fourth lens and the center thickness GT5 of the fifth lens satisfy 0.15 < GT4 / GT5 < 0.4; The center thickness GT10 of the tenth lens and the center thickness GT11 of the eleventh lens satisfy 1.3 < GT10 / GT11 < 3.

1.

24. The electronic device according to claim 15, characterized in that, The first and second lenses are cemented lenses; the air gap AT1 between the second and third lenses along the optical axis is 2.48 mm to 3.59 mm; the air gap AT2 between the third and fourth lenses along the optical axis is 3.43 mm to 4.97 mm; the fourth and fifth lenses are cemented lenses; the air gap AT3 between the fifth and sixth lenses along the optical axis is 0.15 mm to 0.23 mm; the air gap AT4 between the sixth and seventh lenses along the optical axis is 0.07 mm to 0.11 mm; the seventh lens and the aperture... The air gap distance AT5 along the optical axis of the aperture stop is 6.87mm to 9.94mm; the air gap distance AT6 between the aperture stop and the eighth lens along the optical axis is 1.68mm to 2.43mm; the air gap distance AT7 between the eighth lens and the ninth lens along the optical axis is 0.12mm to 0.18mm; the air gap distance AT8 between the ninth lens and the tenth lens along the optical axis is 0.25mm to 0.37mm; the tenth lens and the eleventh lens are cemented lenses; the air gap distance BFL between the eleventh lens and the image plane along the optical axis is 9.68mm to 14.00mm.

25. The electronic device according to claim 24, characterized in that, The air gap AT5 between the seventh lens and the aperture stop along the optical axis and the air gap AT6 between the aperture stop and the eighth lens along the optical axis satisfy 8.5 < AT5 + AT6 < 12.

4. The air gap distance BFL between the eleventh lens and the image plane along the optical axis satisfies 0.14 < BFL / TTL2 < 0.27 with respect to the total optical length TTL2 of the system.

26. The electronic device according to claim 15, characterized in that, The focal length f1 of the first lens is 23.7mm to 34.4mm; the focal length f2 of the second lens is -18.4mm to -12.6mm; the focal length f3 of the third lens is -48.1mm to -33.2mm; the focal length f4 of the fourth lens is -12.4mm to -8.5mm; the focal length f5 of the fifth lens is 15.9mm to 23.1mm; the focal length f6 of the sixth lens is 26.4mm to 38.2mm; the focal length f7 of the seventh lens is 37.6mm to 54.5mm; the focal length f8 of the eighth lens is 40.6mm to 58.7mm; the focal length f9 of the ninth lens is 33.7mm to 48.8mm; the focal length f10 of the tenth lens is -122.3mm to -84.6mm; and the focal length f11 of the eleventh lens is -61.8mm to -42.7mm.

27. The electronic device according to claim 15, characterized in that, The focal length f1 of the first lens satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; the focal length f2 of the second lens satisfies 0.9 < |f2 / fi| < 2.1 with respect to the effective focal length fi of the lens; the focal length f3 of the third lens satisfies 2.5 < |f3 / fi| < 5.4 with respect to the effective focal length fi of the lens; the focal length f4 of the fourth lens satisfies 0.6 < |f4 / fi| < 1.4 with respect to the effective focal length fi of the lens; the focal length f5 of the fifth lens satisfies 1.2 < f5 / fi < 2.5 with respect to the effective focal length fi of the lens; the focal length f6 of the sixth lens satisfies 1.2 < f5 / fi < 2.5 with respect to the effective focal length fi of the lens; the focal length f6 of the sixth lens satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; the focal length f2 of the second lens satisfies 0.9 < |f2 / fi| < 2.1 with respect to the effective focal length fi of the lens; the focal length f3 of the third lens satisfies 2.5 < |f3 / fi| < 5.4 with respect to the effective focal length fi of the lens; the focal length f4 of the fourth lens satisfies 0.6 < |f4 / fi| < 1.4 with respect to the effective focal length fi of the lens; the focal length f5 of the fifth lens satisfies 1.2 < f5 / fi < 2.5 with respect to the effective focal length fi of the lens; the focal length f6 of the sixth lens satisfies 1.8 < f1 / fi < 3.9 with respect to the effective focal length fi of the lens; the focal length f1 of the third lens satisfies 1.8 < f1 / fi < 3.9 with respect to the The following conditions must be met for the focal lengths of the lenses: f10 and f21; f6 / fi and f21; f7 and f8; f8 and f21; f9 and f21; f9 and f21; f9 and f21; f11 and f21; f11 and f21; f11 and f21.

28. The electronic device according to any one of claims 15-27, characterized in that, The imaging lens has an aperture number Fno2 of F2.0 to F8.0, a half field of view of 20° to 30°, an image-side target size IMG2 of 6mm to 12mm, and a total optical length TTL2 of 46.7mm to 67.5mm. The effective focal length fi of the imaging lens and the image-side target size IMG2 of the imaging lens satisfy the condition 0.85 < fi / IMG2 < 1.

81.

29. The electronic device according to any one of claims 15-27, characterized in that, The imaging lens has a field curvature of less than 20 μm and an optical distortion of less than 4.5% across the entire field of view. The distortion curve of the imaging lens exhibits a monotonic variation across the entire field of view; The imaging lens has a full-field relative illumination greater than 92%; The imaging lens has a contrast ratio greater than 0.3 at a spatial frequency of 400 lp / mm with a full field of view MTF value. The imaging lens has a contrast attenuation of zero at a spatial frequency of 800 lp / mm with a full field of view MTF value. Within the entire operating band of the imaging lens, the offset of the transverse chromatic aberration is less than 2 μm and converges within the Airy disk. Within the temperature range of -20℃ to 60℃, the contrast variation of the full-field MTF value of the imaging lens at a spatial frequency of 200 lp / mm is less than 0.

05. Within the temperature range of -20℃ to 60℃, the focal shift of the imaging lens changes by less than 0.005mm.

30. The electronic device according to any one of claims 15-27, characterized in that, Each lens of the imaging lens is a glass lens, and each lens of the imaging lens is a spherical lens.

Images