A zoom lens

Abstract

The application discloses a zoom lens, which comprises a system front group and a system rear group arranged in sequence along an optical axis from an object plane to an image plane, the system front group has negative optical power, and the system rear group has positive optical power; the overall zoom lens forms a reverse telephoto structure, which can effectively improve the back working distance of the zoom lens and meet the space requirement of the structural components of the zoom lens. Meanwhile, the long working distance is beneficial to improving the edge illumination of the zoom lens, so that the zoom lens can achieve 1 / 1.8'' large image surface and the image brightness is also uniform. In addition, the optical power of the system front group at the long-focus end and the optical power of the system front group at the wide-angle end meet the characteristics that the zoom lens can realize large aperture at the long-focus end; the optical power of the system rear group at the long-focus end and the optical power of the system rear group at the wide-angle end meet the characteristics that the motion state of different groups can be well reflected, which is beneficial to the structural optimization of the zoom lens, improves the cam motion mode, makes the structure of the zoom lens more reasonable, is more beneficial to production, and saves cost.

Description

Technical Field

[0001] The present invention relates to the field of optical device technology, and in particular to a zoom lens. Background Technology

[0002] With the continuous advancement of technology and the continuous improvement of craftsmanship in various industries, society has placed increasingly higher demands on zoom security lenses. In terms of performance, the relative aperture at the telephoto end of ordinary zoom lenses decreases sharply due to the increase in focal length, resulting in significant differences in image brightness at different focal lengths and unstable image brightness. At the same time, due to limitations in manufacturing processes, previous zoom lenses generally produced images with low pixel counts and blurry image quality.

[0003] Therefore, based on the above requirements, it is necessary to develop a high-definition, large-aperture zoom security lens, so that the zoom lens has the characteristics of variable focal length, constant large aperture and high pixel count. Summary of the Invention

[0004] This invention provides a zoom lens that achieves a zoom lens design with high image quality.

[0005] This invention provides a zoom lens, including a front group of systems and a rear group of systems arranged sequentially along the optical axis from the object plane to the image plane. The front group of systems has negative optical power, and the rear group of systems has positive optical power.

[0006] The optical power of the system's front group at the wide-angle end is: The optical power at the telephoto end is: The optical power of the system's rear group at the wide-angle end is: The optical power at the telephoto end is:

[0007] in,

[0008] Optionally, the front group of the system includes a first fixed lens group and a zoom lens group, and the rear group of the system includes a second fixed lens group and a compensation lens group;

[0009] The first fixed lens group has positive optical power, the zoom lens group has negative optical power, the second fixed lens group has positive optical power, and the compensation lens group has positive optical power.

[0010] Optionally, the optical power of the first fixed lens group is The optical power of the zoom lens group is: The optical power of the second fixed lens group is The optical power of the compensation lens group is: The zoom lens has an optical power of [missing value] at the wide-angle end.

[0011] in,

[0012] Optionally, the first fixed lens group includes a first lens, a second lens, and a third lens arranged sequentially from the object plane to the image plane, wherein the first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power.

[0013] The zoom lens group includes a fourth lens, a fifth lens, and a sixth lens. The fourth lens has negative optical power, the fifth lens has negative optical power, and the sixth lens has positive optical power.

[0014] The second fixed lens group includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens, wherein the seventh lens has positive optical power, the ninth lens has positive optical power, and the tenth lens has negative optical power;

[0015] The compensation lens group includes an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens. The eleventh lens has positive optical power, the thirteenth lens has negative optical power, and the fourteenth lens has positive optical power.

[0016] Optionally, the optical power of the first lens is The optical power of the second lens is The optical power of the third lens is The optical power of the fourth lens is: The optical power of the fifth lens is The optical power of the sixth lens is: The optical power of the seventh lens is The optical power of the tenth lens is:

[0017] in,

[0018] Optionally, the first lens and the second lens are cemented together; the fifth lens and the sixth lens are cemented together; and the ninth lens and the tenth lens are cemented together.

[0019] Optionally, the Abbe number of the first lens is vd1, the Abbe number of the second lens is vd2, the refractive index of the third lens is nd3, the Abbe number of the third lens is vd3, the refractive index of the fifth lens is nd5, the Abbe number of the fifth lens is vd5, the refractive index of the sixth lens is nd6, the Abbe number of the sixth lens is vd6, the Abbe number of the ninth lens is vd9, and the Abbe number of the tenth lens is vd10.

[0020] Among them, vd1 < 28.08, vd2 > 72.13, nd3 < 1.751, and vd3 > 72.08;

[0021] nd5<1.720, nd6>1.700, vd5>61.51, vd6<30.30;

[0022] vd9>62.00, vd10<40.00.

[0023] Optionally, the first lens includes a first object-side surface near the object surface and a first image-side surface near the image surface, wherein the first object-side surface is convex and the first image-side surface is concave.

[0024] The second lens includes a second image-side surface near the image plane, and the second image-side surface is convex.

[0025] The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is concave.

[0026] The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is concave, and the fourth image-side surface is concave.

[0027] The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is concave, and the fifth image-side surface is concave.

[0028] The seventh lens includes a seventh object-side surface near the object surface, and the seventh object-side surface is convex.

[0029] The eighth lens includes an eighth object-side surface near the object plane and an eighth image-side surface near the image plane. The eighth object-side surface is convex, and the eighth image-side surface is concave.

[0030] The ninth lens includes a ninth object-side surface near the object plane and a ninth image-side surface near the image plane. The ninth object-side surface is convex, and the ninth image-side surface is convex.

[0031] The tenth lens includes a tenth image side surface near the image plane, and the tenth image side surface is concave.

[0032] The eleventh lens includes an eleventh object-side surface near the object plane and an eleventh image-side surface near the image plane. The eleventh object-side surface is convex, and the eleventh image-side surface is convex.

[0033] The twelfth lens includes a twelfth object-side surface near the object plane and a twelfth image-side surface near the image plane. The twelfth object-side surface is concave, and the twelfth image-side surface is convex.

[0034] The thirteenth lens includes a thirteenth object-side surface near the object plane and a thirteenth image-side surface near the image plane. The thirteenth object-side surface is concave, and the thirteenth image-side surface is concave.

[0035] The fourteenth lens includes a fourteenth object-side surface near the object plane and a fourteenth image-side surface near the image plane. The fourteenth object-side surface is convex, and the fourteenth image-side surface is concave.

[0036] Optionally, the center thickness of the thirteenth lens is THIC. 13 The edge thickness of the thirteenth lens is EG. 13 The center thickness of the fourteenth lens is THIC. 14 The edge thickness of the fourteenth lens is EG. 14 ;

[0037] Among them, 0.300 <THIC 13 / EG 13 <1.000, EG 14 / THIC 14 <1.000.

[0038] Optionally, the zoom lens has an optical power of [missing value] at the wide-angle end. The optical power at the telephoto end is:

[0039] in,

[0040] Optionally, the zoom lens has an F-number of F at the wide-angle end. W At the telephoto end, the F-number is F. T ;

[0041] Among them, F T / F W <1.159.

[0042] Optionally, it is characterized by F T >1.593.

[0043] Optionally, the field of view of the zoom lens at the telephoto end is ω. T ;

[0044] Where, ω T ≥15.369°.

[0045] Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the ninth lens, the tenth lens, and the eleventh lens are all glass spherical lenses;

[0046] The eighth lens, the twelfth lens, the thirteenth lens, and the fourteenth lens are all plastic aspherical lenses.

[0047] Optionally, the zoom lens may also include an aperture stop and a filter;

[0048] The aperture is disposed in the optical path between the front group and the rear group of the system;

[0049] The filter is disposed in the optical path between the rear group of the system and the image plane.

[0050] The zoom lens provided by this invention includes a front group and a rear group. The front group has negative optical power, and the rear group has positive optical power. The overall zoom lens forms a reverse telephoto structure, which can effectively increase the rear working distance of the zoom lens and meet the space requirements of zoom lens structural components (such as filters, base length, etc.). Simultaneously, the longer working distance helps improve the edge illumination of the zoom lens, enabling the zoom lens to achieve uniform image brightness even with a 1 / 1.8” large image plane. Furthermore, the optical power of the front group at the telephoto end... Optical power at the wide-angle end satisfy This is advantageous for zoom lenses to achieve a large aperture at the telephoto end; furthermore, the system's rear array has a high optical power at the telephoto end. Optical power of the system's rear group at the wide-angle end satisfy The ratio of optical power at different focal lengths between different groups can well reflect the movement of different groups, which is conducive to the structural optimization of zoom lenses, improving the cam movement mode, making the structure of zoom lenses more reasonable, more conducive to production, and saving costs.

[0051] It should be understood that the description in this section is not intended to identify key or essential features of the invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0054] Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0055] Figure 3 This is a schematic diagram of the light fan at the wide-angle end of the zoom lens provided in Embodiment 1 of the present invention.

[0056] Figure 4 This is a schematic diagram of the axial chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 1 of the present invention;

[0057] Figure 5 This is a schematic diagram of the transverse chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 1 of the present invention;

[0058] Figure 6 This is a schematic diagram of the light fan at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention;

[0059] Figure 7 This is a schematic diagram of the axial chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention;

[0060] Figure 8 This is a schematic diagram of the transverse chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention;

[0061] Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0062] Figure 10 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0063] Figure 11 This is a schematic diagram of the light fan at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention;

[0064] Figure 12 This is a schematic diagram of the axial chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention;

[0065] Figure 13 This is a schematic diagram of the transverse chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention;

[0066] Figure 14 This is a schematic diagram of the light fan at the telephoto end of the zoom lens provided in Embodiment 2 of the present invention.

[0067] Figure 15 This is a schematic diagram of the axial chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 2 of the present invention;

[0068] Figure 16 This is a schematic diagram of the vertical chromatic aberration of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0069] Figure 17 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0070] Figure 18 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0071] Figure 19 This is a schematic diagram of the light fan at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention;

[0072] Figure 20 This is a schematic diagram of the axial chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention;

[0073] Figure 21 This is a schematic diagram of the transverse chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention;

[0074] Figure 22 This is a schematic diagram of the light fan at the telephoto end of the zoom lens provided in Embodiment 3 of the present invention;

[0075] Figure 23 This is a schematic diagram of the axial chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 3 of the present invention;

[0076] Figure 24 This is a schematic diagram of the vertical chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 3 of the present invention. Detailed Implementation

[0077] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0078] Example 1

[0079] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention, as shown below. Figure 1 and Figure 2As shown, the zoom lens provided in Embodiment 1 of the present invention includes a front group G1 and a rear group G2 arranged sequentially along the optical axis from the object plane to the image plane. The front group G1 has negative optical power, and the rear group G2 has positive optical power. The optical power of the front group G1 at the wide-angle end is... The optical power at the telephoto end is: The optical power of the rear group G2 at the wide-angle end is: The optical power at the telephoto end is: in,

[0080]

[0081] Specifically, the front group G1 of the system can be understood as a combination of multiple lenses located in the front part of the optical path structure of the zoom lens, and the rear group G2 of the system can be understood as a combination of multiple lenses located in the rear part of the optical path structure of the zoom lens.

[0082] Furthermore, optical power is equal to the difference between the convergence of the beam at the image plane and the convergence of the beam at the object plane, characterizing the zoom lens's ability to deflect light. The larger the absolute value of the optical power, the stronger the bending ability of light; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light is converging; when the optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., a surface of the lens), a single lens, or a zoom lens (i.e., a lens group) formed by multiple lenses. In this embodiment of the invention, the front group G1 of the system has negative optical power, and the rear group G2 of the system has positive optical power. Thus, the front group G1 and the rear group G2 together constitute an anti-telephoto structure, which can effectively improve the rear working distance of the zoom lens and meet the space requirements of zoom lens structural components (such as filters, base length, etc.). At the same time, a long working distance helps to improve the edge illumination of the zoom lens, enabling the zoom lens to achieve a large image size of 1 / 1.8” while maintaining uniform image brightness.

[0083] Furthermore, the optical power of the system's front group G1 at the wide-angle end... Optical power at the telephoto end Between satisfy This makes it easier for zoom lenses to achieve a large aperture at the telephoto end. Specifically, in this embodiment of the invention, the F-number of the zoom lens at the telephoto end is F... T , of which F T >1.593, meaning the zoom lens meets the large aperture requirement at the telephoto end, which helps improve image brightness and quality at the telephoto end. Meanwhile, the system's rear G2 has a high optical power at the wide-angle end. Optical power at the telephoto end satisfy The ratio of optical power of the front group G1 and the rear group G2 at different focal lengths can well reflect the movement of different groups, which is beneficial to the optimization of zoom lens structure, improves the cam movement mode, makes the zoom lens structure more reasonable, more conducive to production, and saves costs.

[0084] Based on the above embodiments, continue to refer to Figure 1 and Figure 2 As shown, the zoom lens also includes an aperture stop STO and a filter 115; the aperture stop STO is disposed in the optical path between the front group G1 and the rear group G2 of the system; the filter 115 is disposed in the optical path between the rear group G3 of the system and the image plane.

[0085] Specifically, by setting the aperture stop STO, the propagation direction of the light beam can be adjusted, which is beneficial to improving image quality. Furthermore, in this zoom lens, the aperture stop STO can be located in the optical path between the front group G1 and the rear group G2 of the system. The purpose is to control the higher-order aberrations of the lens at the front end of the lens, ensuring good image quality while improving image height and expanding the target area at the rear end of the lens. Further, the filter 115 is disposed in the optical path between the rear group G2 and the image plane. The filter 115 can filter out interference light, improving the imaging effect of the zoom lens. Further, the zoom lens provided in this embodiment of the invention may also include a protective glass and an image acquisition element. The protective glass can be disposed on the image-side of the filter, and the image acquisition element can be disposed on the image-side of the protective glass. The protective glass protects the optical system, and the image acquisition element acquires images, enabling the optical system to perform its normal imaging function.

[0086] Based on the above embodiments, continue to refer to Figure 1 and Figure 2 As shown, the front group G1 of the system includes a first fixed lens group S1 and a zoom lens group S2, and the rear group G2 of the system includes a second fixed lens group S3 and a compensation lens group S4; the first fixed lens group S1 has positive optical power, the zoom lens group S2 has negative optical power, the second fixed lens group S3 has positive optical power, and the compensation lens group S4 has positive optical power.

[0087] Specifically, in the zoom lens provided in this embodiment, the first fixed lens group S1, the zoom lens group S2, the second fixed lens group S3, and the compensation lens group S4 can be disposed in one lens barrel. Figure 1 and Figure 2 (Not shown in the image). The first fixed lens group S1 and the second fixed lens group S3 are fixed in position within the lens barrel. The zoom lens group S2 and the compensation lens group S4 can reciprocate along the optical axis within the lens barrel. Through the movement of the zoom lens group S2 and the compensation lens group S4, the focal length of the zoom lens can be continuously changed from wide-angle to telephoto, ensuring high image quality at each focal point.

[0088] It is understandable that during the zoom process achieved by moving the zoom lens group S2, the zoom lens is at its shortest focal length, which is when it is at the wide-angle end, and at its longest focal length, which is when it is at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths, as well as different lengths or shapes.

[0089] Furthermore, the first fixed lens group S1 has positive optical power, which can compress the overall light aperture at the telephoto end and increase the field of view at the telephoto end. Specifically, the zoom lens provided in this embodiment of the invention has a field of view of ω at the telephoto end. T , where ω T With a focal length of ≥15.369°, the zoom lens maintains a good field of view at the telephoto end, ensuring image quality. Furthermore, the zoom lens group S2 has negative optical power, which expands the on-axis aperture, increasing the relative aperture at the wide-angle end and achieving a large aperture. The second fixed lens group S3 has positive optical power, effectively optimizing on-axis and transverse aberrations at different focal lengths, improving image quality. The compensation lens group S4 has positive optical power, used to optimize off-axis and transverse chromatic aberrations, improving image quality at different focal lengths and fields of view.

[0090] Based on the above embodiments, the optical power of the first fixed lens group S1 is The optical power of the zoom lens group S2 is The optical power of the second fixed lens group S3 is: The optical power of the compensating lens group S4 is The zoom lens has an optical power of 1000 at the wide-angle end. in, A certain ratio of optical power can effectively adjust the structure of a zoom lens, making the light change from the wide-angle end to the telephoto end of the zoom lens gradual. This helps to reduce aberrations in the zoom lens, improve the overall image quality of the zoom lens, and ensure good resolution at different focal lengths.

[0091] Based on the above embodiments, the first fixed lens group S1 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially from the object plane to the image plane. The first lens 101 has negative optical power, the second lens 102 has positive optical power, and the third lens 103 has positive optical power. The zoom lens group S2 includes a fourth lens 104, a fifth lens 105, and a sixth lens 106. The fourth lens 104 has negative optical power, the fifth lens 105 has negative optical power, and the sixth lens 106 has positive optical power. The second fixed lens group S3 includes a seventh lens 107, an eighth lens 108, a ninth lens 109, and a tenth lens 110. The seventh lens 107 has positive optical power, the ninth lens 109 has positive optical power, and the tenth lens 110 has negative optical power. The compensation lens group S4 includes an eleventh lens 111, a twelfth lens 112, a thirteenth lens 113, and a fourteenth lens 114. The eleventh lens 111 has positive optical power, the thirteenth lens 113 has negative optical power, and the fourteenth lens 114 has positive optical power.

[0092] Specifically, the first lens 101 is a negative power lens. The negative power of the first lens 101 reduces the off-axis beam tilt angle, which not only optimizes the chromatic aberration caused by the first fixed lens group S1 itself but also effectively reduces aberrations in the off-axis field of view. The second lens 102 and the third lens 103 are both positive power lenses. Thus, the second lens 102 and the third lens 103 can promptly correct the larger aberrations produced by the first lens 101, especially significantly correcting edge aberrations in zoom lenses, thereby improving the imaging resolution of the zoom lens. Furthermore, the negative power of the first lens 101, the positive power of the second lens 102, and the positive power of the third lens 103 ensure that the positive power setting of the first fixed lens group S1 can be achieved. Furthermore, the negative optical power settings of the fourth lens 104, the fifth lens 105, and the sixth lens 106 ensure that the negative optical power setting of the zoom lens group S2 can be achieved, and the negative optical power setting of the fourth lens 104 can neutralize the negative spherical aberration caused by the positive optical power setting of the first fixed lens group S. Furthermore, the positive optical power settings of the seventh lens 107, the ninth lens 109, and the tenth lens 110 enable the positive optical power setting of the second fixed lens group S3. The positive optical power settings of the eleventh lens 111, the thirteenth lens 113, and the fourteenth lens 114 enable the positive optical power setting of the compensation lens group S4. Furthermore, the eighth lens 108 and the twelfth lens 112 are both lenses with optical power; the optical power of these two lenses can be positive or negative, and this embodiment of the invention does not limit this.

[0093] Based on the above embodiments, the optical power of the first lens 101 is: The optical power of the second lens 102 is The optical power of the third lens 103 is: The optical power of the fourth lens 104 is The optical power of the fifth lens 105 is The optical power of the sixth lens 106 is The optical power of the seventh lens 107 is The optical power of the tenth lens 110 is in,

[0094] Specifically, the absolute value of the maximum optical power among the first lens 101, the second lens 102, and the third lens 103 is in Appropriate optical power can reduce the contribution of a single lens to aberrations in a zoom lens.

[0095] Furthermore, the absolute value of the minimum optical power among the fourth lens 104, the fifth lens 105, and the sixth lens 106 is in A certain optical power can better improve the zoom ratio and relative aperture of the system.

[0096] Furthermore, the optical power of the seventh lens 107 satisfy Appropriate optical power can reduce the aperture angle brought about by the front group G1 of the system and reduce the volume of the rear group G2 of the system.

[0097] Furthermore, the optical power of the tenth lens 110 is... satisfy This effectively reduces the chromatic aberration of the second fixed lens group S3 on the zoom lens, which is beneficial for the zoom lens to achieve infrared confocal characteristics.

[0098] Based on the above embodiments, continue to refer to Figure 1 and Figure 2 As shown, the first lens 101 and the second lens 102 are cemented together; the fifth lens 105 and the sixth lens 106 are cemented together; and the ninth lens 109 and the tenth lens 110 are cemented together.

[0099] Specifically, the cemented joint of the first lens 101 and the second lens 102 can be understood as follows: the image-side surface of the first lens 101 is bonded to the object-side surface of the second lens 102, meaning the image-side surface of the first lens 101 is bonded to the object-side surface of the second lens 102. Similarly, the cemented joint of the fifth lens 105 and the sixth lens 106 can be understood as follows: the image-side surface of the fifth lens 105 is bonded to the object-side surface of the sixth lens 106, meaning the image-side surface of the fifth lens 105 is bonded to the object-side surface of the sixth lens 106. Likewise, the cemented joint of the ninth lens 109 and the tenth lens 110 can be understood as follows: the image-side surface of the ninth lens 109 is bonded to the object-side surface of the tenth lens 110, meaning the image-side surface of the ninth lens 109 is bonded to the object-side surface of the tenth lens 110. By cementing the first lens 101 and the second lens 102 together, the air gap between them can be reduced. Similarly, cementing the fifth lens 105 and the sixth lens 105 together reduces the air gap between them. Likewise, cementing the ninth lens 109 and the tenth lens 110 together reduces the air gap between them. All these methods contribute to reducing the overall optical length of the lens and also reduce tolerance sensitivity issues such as tilting / eccentricity during lens assembly, simplifying the assembly process in lens manufacturing and improving equipment efficiency. Furthermore, the cementing of the first lens 101 and the second lens 102, the fifth lens 105 and the sixth lens 105, and the ninth lens 109 and the tenth lens 110 together also reduces light loss caused by inter-lens reflections, improving illumination and reducing the risk of ghosting. Furthermore, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in zoom lenses can improve image quality and reduce light energy reflection loss, thereby improving image quality and enhancing the sharpness of the lens image. Furthermore, the cementing arrangements between the first lens 101 and the second lens 102, between the fifth lens 105 and the sixth lens 106, and between the ninth lens 109 and the tenth lens 110 can be achieved through spacer support or adhesive bonding. This embodiment of the invention does not limit the specific bonding method.

[0100] Based on the above embodiments, the Abbe number of the first lens 101 is vd1, the Abbe number of the second lens 102 is vd2, the refractive index of the third lens 103 is nd3, and the Abbe number of the third lens 103 is vd3, the refractive index of the fifth lens 105 is nd5, and the Abbe number of the fifth lens 105 is vd5, the refractive index of the sixth lens 106 is nd6, and the Abbe number of the sixth lens 106 is vd6, the Abbe number of the ninth lens 109 is vd9, and the Abbe number of the tenth lens 110 is vd10; wherein, vd1 < 28.08, vd2 > 72.13, nd3 < 1.751, vd3 > 72.08; nd5 < 1.720, nd6 > 1.700, vd5 > 61.51, vd6 < 30.30; vd9 > 62.00, and vd10 < 40.00.

[0101] Specifically, setting vd1 < 28.08, vd2 > 72.13, nd3 < 1.751, vd3 > 72.08, nd5 < 1.720, nd6 > 1.700, vd5 > 61.51, and vd6 < 30.30, this combination of low refractive index material and high Abbe number reduces the impact of a single lens on chromatic aberration in the zoom lens. This allows the zoom lens to not only achieve chromatic aberration correction in the visible light band but also reduce axial chromatic aberration in the infrared band, which is beneficial for achieving infrared confocal characteristics in the zoom lens. Furthermore, setting vd9 > 62.00 and vd10 < 40.00 effectively reduces the impact of chromatic aberration from the second fixed lens group S3 on the zoom lens, further contributing to achieving infrared confocal characteristics in the zoom lens.

[0102] Based on the above embodiments, continue to refer to Figure 1 and Figure 2As shown, the first lens 101 includes a first object-side surface near the object plane and a first image-side surface near the image plane, the first object-side surface being convex and the first image-side surface being concave; the second lens 102 includes a second image-side surface near the image plane, the second image-side surface being convex; the third lens 103 includes a third object-side surface near the object plane and a third image-side surface near the image plane, the third object-side surface being convex and the third image-side surface being concave; the fourth lens 104 includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane, the fourth object-side surface being concave and the fourth image-side surface being concave; the fifth lens 105 includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane, the fifth object-side surface being concave and the fifth image-side surface being concave; the seventh lens 107 includes a seventh object-side surface near the object plane, the seventh object-side surface being convex; the eighth lens 108 includes an eighth object-side surface near the object plane and an eighth image-side surface near the image plane, the eighth object-side surface being convex and the eighth image-side surface being concave. The image side is concave; the ninth lens 109 includes a ninth object side near the object plane and a ninth image side near the image plane, the ninth object side and the ninth image side are convex; the tenth lens 110 includes a tenth image side near the image plane, the tenth image side is concave; the eleventh lens 111 includes an eleventh object side near the object plane and an eleventh image side near the image plane, the eleventh object side and the eleventh image side are convex; the twelfth lens 112 includes a twelfth object side near the object plane and a twelfth image side near the image plane, the twelfth object side is concave and the twelfth image side is convex; the thirteenth lens 113 includes a thirteenth object side near the object plane and a thirteenth image side near the image plane, the thirteenth object side and the thirteenth image side are concave; the fourteenth lens 114 includes a fourteenth object side near the object plane and a fourteenth image side near the image plane, the fourteenth object side is convex and the fourteenth image side is concave.

[0103] Specifically, the object-side surface of a lens can be understood as the surface of the lens closest to the object plane, and the image-side surface can be understood as the surface of the lens closest to the image plane. The first object-side surface is convex, and the first image-side surface is concave. That is, the object-side surface of the first lens 101 convexes towards the object plane near the optical axis, and the image-side surface is concave towards the image plane near the optical axis; thus, the first lens 102 is a convex-concave lens. The second image-side surface is convex, meaning the image-side surface of the second lens 102 convexes towards the image plane near the optical axis. The third object-side surface is convex, and the third image-side surface is concave. That is, the object-side surface of the third lens 103 convexes towards the object plane near the optical axis, and the image-side surface is concave towards the image plane near the optical axis; thus, the third lens 103 is a convex-concave lens. The fourth object-side surface is concave, and the fourth image-side surface is concave. That is, the object-side surface of the fourth lens 104 is concave towards the object plane near the optical axis, and the image-side surface is concave towards the image plane near the optical axis; thus, the fourth lens 104 is a biconcave lens. The fourth lens 104 is biconcave on both the object and image sides to reduce its spherical aberration. The fifth object side is concave, and the fifth image side is also concave; that is, the object side of the fifth lens 105 is concave towards the object plane near the optical axis, and the image side is concave towards the image plane near the optical axis, making the fifth lens 105 a biconcave lens. The fifth lens 105 uses the same shape as the fourth lens 104 and is cemented with the sixth lens 106. This reduces chromatic aberration at magnification and position in the zoom lens group S2, which helps reduce resolving differences between visible and infrared light at different focal lengths.

[0104] The seventh object-side surface is convex, meaning the object-side surface of the seventh lens 107 convexes towards the object plane near the optical axis. The eighth image-side surface is both convex and concave, meaning the object-side surface of the eighth lens 108 convexes towards the object plane near the optical axis, while the image-side surface is concave towards the image plane near the optical axis; therefore, the eighth lens 108 is a convex-concave lens. The ninth object-side surface and the ninth image-side surface are both convex, meaning the object-side surface of the ninth lens 109 convexes towards the object plane near the optical axis, while the image-side surface is concave towards the image plane near the optical axis; therefore, the ninth lens 109 is a biconvex lens. The tenth image-side surface is concave, meaning the image-side surface of the tenth lens 110 is concave towards the image plane near the optical axis. The eleventh object-side surface and the eleventh image-side surface are both convex, meaning the object-side surface of the eleventh lens 111 convexes towards the object plane near the optical axis, while the image-side surface is concave towards the image plane near the optical axis; therefore, the eleventh lens 111 is a biconvex lens. The surface shape of the eleventh lens 111, combined with its positive power setting, can reduce spherical aberration in the compensation lens group. The twelfth image-side surface is concave, and the twelfth image-side surface is convex. That is, the object-side surface of the twelfth lens 112 is concave towards the object plane near the optical axis, and the image-side surface is convex towards the image plane near the optical axis; in other words, the twelfth lens 112 is a lens with a concave-convex structure. The concave-convex shape design of the twelfth lens 112, combined with the biconvex structure design of the eleventh lens 111, can further reduce the impact of spherical aberration on the system, thereby improving the system's coma. The thirteenth image-side surface is concave, and the thirteenth image-side surface is concave. That is, the object-side surface of the thirteenth lens 113 is concave towards the object plane near the optical axis, and the image-side surface is concave towards the image plane near the optical axis; in other words, the thirteenth lens 113 is a lens with a biconcave structure. The fourteenth image side is convex, and the fourteenth image side is concave. That is, the object side of the fourteenth lens 114 convexes towards the object plane near the optical axis, and the image side is concave towards the image plane near the optical axis. In other words, the fourteenth lens 114 is a lens with a convex-concave structure. By designing the surface shape of each lens and combining it with the optical power of each lens, the imaging effect of the zoom lens can be further adjusted.

[0105] Based on the above embodiments, the center thickness of the thirteenth lens 113 is THIC. 13 The edge thickness of the thirteenth lens 113 is EG. 13 The center thickness of the fourteenth lens 114 is THIC 14 The edge thickness of the fourteenth lens 114 is EG. 14 ; of which, 0.300 <THIC 13 / EG 13 <1.000, EG 14 / THIC 14 <1.000. This setting helps optimize the system's off-axis field-of-view resolution and improve system image quality.

[0106] Based on the above embodiments, the zoom lens has the following optical power at the wide-angle end: The optical power at the telephoto end is: in, This is beneficial for achieving the large zoom ratio characteristic of zoom lenses.

[0107] Based on the above embodiments, the F-number of the zoom lens at the wide-angle end is F. W At the telephoto end, the F-number is F. T Among them, F T / F W <1.159, which helps to achieve the characteristic of constant aperture at different focal lengths of zoom lenses, ensuring small differences in image brightness at different focal lengths and high image brightness stability.

[0108] Based on the above embodiments, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107, the ninth lens 109, the tenth lens 110, and the eleventh lens 111 are all glass spherical lenses; the eighth lens 108, the twelfth lens 112, the thirteenth lens 113, and the fourteenth lens 114 are all plastic aspherical lenses.

[0109] Specifically, spherical lenses are characterized by a constant curvature from the center to the periphery, ensuring a simple lens configuration. Furthermore, due to the low coefficient of thermal expansion and good stability of glass lenses, it is possible to design the first lens 101, second lens 102, third lens 103, fourth lens 104, fifth lens 105, sixth lens 106, seventh lens 107, ninth lens 109, tenth lens 110, and eleventh lens 111 as glass spherical lenses. The thermal properties of glass spherical lenses are more stable, ensuring good resolving power over a wide temperature range when handling higher optical powers. In addition, compared to plastic aspherical lenses, glass offers a wider range of material choices, with more freedom in selecting refractive index and Abbe number. This allows for better control of higher aberrations and chromatic aberrations, meeting the needs of use under complex conditions.

[0110] Aspherical lenses are characterized by a continuous change in curvature from the center to the periphery, unlike spherical lenses which have a constant curvature. Aspherical lenses offer superior radius of curvature characteristics, improving distortion and astigmatism. Furthermore, aspherical lenses can be made of plastic, which simplifies manufacturing processes and reduces cost. Using a plastic aspherical lens for the eighth lens effectively optimizes advanced on-axis and transverse aberrations, reduces resolving differences between the visible and infrared on-axis fields of view, and lowers the overall cost of the optical system. The use of plastic aspherical lenses for the twelfth, thirteenth, and fourteenth lenses (112, 113, and 114) effectively improves off-axis resolving, ensuring good resolution even with a large 1 / 1.8” target area. This design also reduces resolving differences between the visible and infrared off-axis fields of view, and the extensive use of plastic material further reduces manufacturing costs.

[0111] As a feasible implementation method, the parameters of each lens in the zoom lens will be explained next.

[0112] Table 1. Optical design values ​​for the zoom lens in Example 1.

[0113]

[0114] Table 2 Design values ​​of optical physical parameters for a zoom lens

[0115] Face number Surface type radius of curvature thickness nd vd / dPgF Half-caliber K value 1 Standard surface 134.735 0.576 1.588 20.00 / 0.000 9.869 0.000 2 Standard surface 66.531 1.934 1.577 95.00 / 0.000 9.755 0.000 3 Standard surface -94.111 0.277 9.668 0.000 4 Standard surface 23.696 2.252 1.448 95.00 / 0.000 9.017 0.000 5 Standard surface 65.383 -4.564 8.779 0.000 6 Standard surface INF STEP1 10.681 0.000 7 Standard surface -48.814 0.549 1.900 23.79 / 0.000 5.756 0.000 8 Standard surface 17.865 1.729 5.300 0.000 9 Standard surface -21.807 0.566 1.646 95.00 / 0.000 5.233 0.000 10 Standard surface 21.807 1.343 2.082 19.98 / 0.000 5.313 0.000 11 Standard surface -119.115 21.864 5.304 0.000 12 Standard surface INF -STEP1 10.680 0.000 13 STO INF -0.501 5.413 0.000 14 Standard surface 8.718 3.048 1.556 19.94 / 0.000 5.637 0.000 15 Standard surface 1081.859 0.353 5.637 0.000 16 even aspherical surface 15.476 0.599 1.331 95.00 / 0.000 5.068 2.018 17 even aspherical surface 10.520 0.569 4.741 1.198 18 Standard surface 8.906 3.855 1.616 95.00 / 0.000 4.669 0.000 19 Standard surface -8.140 0.562 1.788 19.92 / 0.000 4.669 0.000 20 Standard surface 7.399 -0.833 3.801 0.000 21 Standard surface INF STEP2 3.584 0.000 22 Standard surface 9.569 2.766 1.752 95.00 / 0.000 4.010 0.000 23 Standard surface -17.875 0.056 4.010 0.000 24 even aspherical surface -26.573 4.232 1.778 19.99 / 0.000 3.935 0.000 25 even aspherical surface -12.335 0.250 4.043 -46.270 26 even aspherical surface -4.536 1.141 1.861 95.00 / 0.000 3.940 -6.949 27 even aspherical surface -25.771 0.246 3.876 34.392 28 even aspherical surface 4.614 1.002 1.951 19.97 / 0.000 4.048 -3.613 29 even aspherical surface 5.772 4.019 4.232 0.516 30 Standard surface INF -STEP2 0.000 31 Standard surface INF 0.700 1.517 64.20 / 0.000 0.000 32 Standard surface INF 2.985 0.000 33 Image

[0116] In Table 2 above, the surface numbers are assigned according to the surface sequence of each lens. "1" represents the object surface of the first lens, and "2" represents the image surface of the first lens. "STO" indicates the aperture stop of the lens; the radius of curvature represents the curvature of the lens surface, in mm. A positive value indicates that the surface bends towards the object surface, and a negative value indicates that the surface bends towards the image surface. "INF" indicates that the surface is flat and the radius of curvature is infinite. Thickness represents the central axial distance between the current surface and the next surface, in mm. "nd" represents the refractive power of the material between the current surface and the next surface. A blank space indicates that the current location is air with a refractive index of 1. "vd" represents the dispersion characteristics of the material between the current surface and the next surface, with a blank space indicating that the current location is air. dPgF represents the relative partial dispersion of the material. Half-aperture indicates half the aperture size of the current surface. The K value represents the magnitude of the conic coefficient of the aspherical surface.

[0117] Table 3. Zoom intervals at the wide-angle and telephoto ends of a zoom lens.

[0118] Wide-angle end telephoto end STEP1 5.841 21.108 STEP2 2.809 2.003 focal length 10.821 29.755 F / # 1.693 1.770 Field of view 50.51° 17.09°

[0119] The zoom intervals in Table 3 are the different intervals at the wide-angle and telephoto ends of the lens.

[0120] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0121]

[0122] Where z is the axial sagitta in the Z-direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, numerically the reciprocal of the radius of curvature R; k is the fitted conic coefficient; a4, a6, a8, a10, a12, a14, a16 are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order higher-order aspherical coefficients corresponding to the aspherical surface, a i r i These can be combined to form higher-order terms for the corresponding aspherical surfaces.

[0123] Table 4. Design values ​​of aspherical conic coefficient for a zoom lens.

[0124]

[0125] "9.681E-05" means 9.681 * 10 -5 All other coefficients are represented in this way.

[0126] Furthermore, Figure 3 The ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention is as follows: Figure 3 As shown, in a single image, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. The light rays in the image describe the aberrations of the system's principal rays. Ideally, each curve should completely coincide with the horizontal axis, at which point all light rays in that field of view are focused at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. As can be seen from the figure, the principal wavelength of this zoom lens is quite close to the horizontal axis in all fields of view, indicating that monochromatic aberrations in each field of view are well corrected.

[0127] Figure 4 This is a schematic diagram of the field curvature chromatic aberration of the zoom lens at the wide-angle end according to Embodiment 1 of the present invention. In the diagram, the vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, and the vertical vertex represents the pupil vertex. The horizontal direction represents the axial chromatic aberration at different wavelengths (specifically 436nm, 486nm, 546nm, 588nm, 656nm, and 850nm), in millimeters (mm). As shown in the figure, the system's axial chromatic aberration is within ±0.05mm, indicating that the system's chromatic aberration correction is good and it can effectively achieve the system's infrared confocal characteristic.

[0128] Figure 5This is a transverse chromatic aberration diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. In the diagram, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. The horizontal direction represents the offset within a meridian range with 0.546 μm as the reference, in micrometers (μm). The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). As shown in the diagram, the transverse chromatic aberration of each wavelength (specifically 436 nm, 486.1 nm, 546 nm, 587.6 nm, and 656.3 nm) is within ±10 μm, indicating that the system has good chromatic aberration correction. As the angle increases, the transverse chromatic aberrations of each wavelength overlap, indicating that the system has a certain degree of chromatic aberration correction in each field of view.

[0129] Figure 6 The ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention is as follows: Figure 6 As shown, in a single image, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. The light rays in the image describe the aberrations of the system's principal rays. Ideally, each curve should completely coincide with the horizontal axis, at which point all light rays in that field of view are focused at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. As can be seen from the figure, the principal wavelength of this zoom lens is quite close to the horizontal axis in all fields of view, indicating that monochromatic aberrations in each field of view are well corrected.

[0130] Figure 7 This is a schematic diagram of the axial chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention. The vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, and the vertical vertex represents the pupil vertex. The horizontal direction represents the axial chromatic aberration at different wavelengths (specifically 436nm, 486nm, 546nm, 588nm, 656nm, and 850nm), in millimeters (mm). As shown in the figure, the system's axial chromatic aberration is within ±0.05mm, indicating that the system's chromatic aberration correction is good and it can effectively achieve the system's infrared confocal characteristic.

[0131] Figure 8 This is a transverse chromatic aberration diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention. In the diagram, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. The horizontal direction represents the offset within a meridian range with 0.546 μm as the reference, in micrometers (μm). The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). As shown in the diagram, the transverse chromatic aberration of each wavelength (specifically 436 nm, 486.1 nm, 546 nm, 587.6 nm, and 656.3 nm) is within ±10 μm, indicating that the system has good chromatic aberration correction. As the angle increases, the transverse chromatic aberrations of each wavelength overlap, indicating that the system has a certain degree of chromatic aberration correction for each field of view.

[0132] In summary, the zoom lens provided in Embodiment 1 of the present invention uses a glass-plastic hybrid lens to achieve high-pixel imaging with a large 1 / 1.8” target surface, while also featuring infrared confocal lens, constant large aperture, and low cost.

[0133] Example 2

[0134] Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention. Figure 10 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, as shown below. Figure 9 and Figure 10 As shown, the zoom lens provided in Embodiment 2 of the present invention includes a front group G1 and a rear group G2 arranged sequentially along the optical axis from the object plane to the image plane. The front group G1 has negative optical power, and the rear group G2 has positive optical power. The optical power of the front group G1 at the wide-angle end is... The optical power at the telephoto end is: The optical power of the rear group G2 at the wide-angle end is: The optical power at the telephoto end is: in,

[0135]

[0136] The lens setup is the same as in Embodiment 1, and will not be repeated here.

[0137] As another feasible implementation method, the specific parameters of the zoom lens are explained below.

[0138] Table 5. Optical design values ​​for the zoom lens in Example 2.

[0139]

[0140] Table 6 Design values ​​of optical physical parameters for a zoom lens

[0141] Face number Surface type radius of curvature thickness nd vd / dPgF Half-caliber K value 1 Standard surface 71.304 0.579 1.676 24.730 / 0.000 10.686 0.000 2 Standard surface 33.224 2.275 1.638 80.140 / 0.000 10.469 0.000 3 Standard surface -340.162 0.285 10.401 0.000 4 Standard surface 40.168 1.625 1.592 80.090 / 0.000 9.957 0.000 5 Standard surface 116.660 -3.796 9.786 0.000 6 Standard surface INF STEP1 9.442 0.000 7 Standard surface -181.392 0.549 1.818 80.100 / 0.000 6.263 0.000 8 Standard surface 30.776 1.408 5.883 0.000 9 Standard surface -25.040 0.554 1.700 80.140 / 0.000 5.796 0.000 10 Standard surface 25.040 1.356 1.844 25.040 / 0.000 5.702 0.000 11 Standard surface 127.440 21.973 5.651 0.000 12 Standard surface INF -STEP1 6.203 0.000 13 STO INF -0.600 5.413 0.000 14 Standard surface 8.745 3.021 1.685 23.480 / 0.000 5.688 0.000 15 Standard surface 353.106 0.525 5.688 0.000 16 even aspherical surface 22.394 0.811 1.534 60.030 / 0.000 5.048 2.018 17 even aspherical surface 9.551 1.008 4.547 1.198 18 Standard surface 11.273 3.575 1.797 82.230 / 0.000 4.517 0.000 19 Standard surface -7.039 0.591 1.897 18.230 / 0.000 4.517 0.000 20 Standard surface 10.475 0.130 3.843 0.000 21 Standard surface INF STEP2 3.810 0.000 22 Standard surface 11.920 3.023 1.811 24.680 / 0.000 4.431 0.000 23 Standard surface -33.045 0.058 4.431 0.000 24 even aspherical surface -57.845 2.106 1.625 24.730 / 0.000 4.405 0.000 25 even aspherical surface -15.276 0.303 4.388 -46.270 26 even aspherical surface -4.790 1.006 1.593 60.350 / 0.000 4.333 -6.949 27 even aspherical surface -219.281 0.249 4.146 34.392 28 even aspherical surface 4.455 1.148 1.618 24.040 / 0.000 4.213 -3.613 29 even aspherical surface 5.858 4.116 4.355 0.516 30 Standard surface INF -STEP2 0.000 31 Standard surface INF 0.700 1.517 64.200 / 0.000 0.000 32 Standard surface INF 2.985 0.000 33 Image

[0142] In Table 6 above, the surface numbers are assigned according to the surface sequence of each lens. "1" represents the object surface of the first lens, and "2" represents the image surface of the first lens. "STO" indicates the aperture stop of the lens; the radius of curvature represents the curvature of the lens surface, in mm. A positive value indicates that the surface bends towards the object surface, and a negative value indicates that the surface bends towards the image surface. "INF" indicates that the surface is flat and the radius of curvature is infinite. Thickness represents the central axial distance between the current surface and the next surface, in mm. "nd" represents the refractive power of the material between the current surface and the next surface. A blank space indicates that the current position is air with a refractive index of 1. "vd" represents the dispersion characteristics of the material between the current surface and the next surface, with a blank space indicating that the current position is air. dPgF represents the relative partial dispersion of the material. Half-aperture indicates half the aperture size of the current surface. The K value represents the magnitude of the conic coefficient of the aspherical surface.

[0143] Table 7. Zoom intervals at the wide-angle and telephoto ends of a zoom lens.

[0144] Wide-angle end telephoto end STEP1 4.614 21.108 STEP2 3.504 2.033 focal length 11.178 29.768 F / # 1.686 1.778 Field of view 49.34° 17.08°

[0145] The zoom intervals in Table 7 are the different intervals at the wide-angle and telephoto ends of the lens.

[0146] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0147]

[0148] Where z is the axial sagitta in the Z-direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, numerically the reciprocal of the radius of curvature R; k is the fitted conic coefficient; a4, a6, a8, a10, a12, a14, a16 are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order higher-order aspherical coefficients corresponding to the aspherical surface, a i r i These can be combined to form higher-order terms for the corresponding aspherical surfaces.

[0149] Table 8. Design values ​​of aspherical conic coefficient for a zoom lens.

[0150]

[0151] "2.531E-04" means 2.531 * 10 -4 All other coefficients are represented in this way.

[0152] Furthermore, Figure 11 The ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention is as follows: Figure 11As shown, in a single image, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. The light rays in the image describe the aberrations of the system's principal rays. Ideally, each curve should completely coincide with the horizontal axis, at which point all light rays in that field of view are focused at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. As can be seen from the figure, the principal wavelength of this zoom lens is quite close to the horizontal axis in all fields of view, indicating that monochromatic aberrations in each field of view are well corrected.

[0153] Figure 12 This is a schematic diagram of the field curvature chromatic aberration of the zoom lens at the wide-angle end according to Embodiment 2 of the present invention. In the diagram, the vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, and the vertical vertex represents the pupil vertex. The horizontal direction represents the axial chromatic aberration at different wavelengths (specifically 436nm, 486nm, 546nm, 588nm, 656nm, and 850nm), in millimeters (mm). As shown in the figure, the system's axial chromatic aberration is within ±0.05mm, indicating that the system's chromatic aberration correction is good and it can effectively achieve the system's infrared confocal characteristic.

[0154] Figure 13 This is a transverse chromatic aberration diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention. In the diagram, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. The horizontal direction represents the offset within a meridian range with 0.546 μm as the reference, in micrometers (μm). The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). As shown in the diagram, the transverse chromatic aberration of each wavelength (specifically 436 nm, 486.1 nm, 546 nm, 587.6 nm, and 656.3 nm) is within ±10 μm, indicating that the system has good chromatic aberration correction. As the angle increases, the transverse chromatic aberrations of each wavelength overlap, indicating that the system has a certain degree of chromatic aberration correction in each field of view.

[0155] Figure 14 The ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention is as follows: Figure 14 As shown, in a single image, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. The light rays in the image describe the aberrations of the system's principal rays. Ideally, each curve should completely coincide with the horizontal axis, at which point all light rays in that field of view are focused at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. As can be seen from the figure, the principal wavelength of this zoom lens is quite close to the horizontal axis in all fields of view, indicating that monochromatic aberrations in each field of view are well corrected.

[0156] Figure 15This is a schematic diagram of the axial chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 2 of the present invention. The vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, and the vertical vertex represents the pupil vertex. The horizontal direction represents the axial chromatic aberration at different wavelengths (specifically 436nm, 486nm, 546nm, 588nm, 656nm, and 850nm), in millimeters (mm). As shown in the figure, the system's axial chromatic aberration is within ±0.05mm, indicating that the system's chromatic aberration correction is good and it can effectively achieve the system's infrared confocal characteristic.

[0157] Figure 16 This is a transverse chromatic aberration diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention. In the diagram, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. The horizontal direction represents the offset within a meridian range with 0.546 μm as the reference, in micrometers (μm). The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). As shown in the diagram, the transverse chromatic aberration of each wavelength (specifically 436 nm, 486.1 nm, 546 nm, 587.6 nm, and 656.3 nm) is within ±10 μm, indicating that the system has good chromatic aberration correction. As the angle increases, the transverse chromatic aberrations of each wavelength overlap, indicating that the system has a certain degree of chromatic aberration correction for each field of view.

[0158] In summary, the zoom lens provided in Embodiment 2 of the present invention uses a glass-plastic hybrid lens to achieve high-pixel imaging with a large 1 / 1.8” target surface, while also featuring infrared confocal lens, constant large aperture, and low cost.

[0159] Example 3

[0160] Figure 17 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention. Figure 18 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention, as shown below. Figure 17 and Figure 18 As shown, the zoom lens provided in Embodiment 3 of the present invention includes a front group G1 and a rear group G2 arranged sequentially along the optical axis from the object plane to the image plane. The front group G1 has negative optical power, and the rear group G2 has positive optical power. The optical power of the front group G1 at the wide-angle end is... The optical power at the telephoto end is: The optical power of the rear group G2 at the wide-angle end is: The optical power at the telephoto end is: in,

[0161]

[0162] The lens setup is the same as in Embodiment 1, and will not be repeated here.

[0163] As another feasible implementation method, the specific parameters of the zoom lens are explained below.

[0164] Table 9. Optical design values ​​for the zoom lens in Example 3.

[0165]

[0166] Table 10 Design values ​​of optical physical parameters for a zoom lens

[0167] Face number Surface type radius of curvature thickness nd vd Half-caliber K value 1 Standard surface 331.002 0.786 1.847 31.200 / -0.040 9.954 0.000 2 Standard surface 69.187 1.900 1.497 90.040 / -0.050 9.815 0.000 3 Standard surface -76.343 0.273 9.755 0.000 4 Standard surface 24.182 2.087 1.520 84.610 / 0.051 9.195 0.000 5 Standard surface 122.659 -6.046 9.052 0.000 6 Standard surface INF STEP1 11.511 0.000 7 Standard surface -46.647 0.520 1.755 46.310 / 0.003 5.458 0.000 8 Standard surface 19.322 1.296 5.256 0.000 9 Standard surface -30.096 2.584 1.593 68.340 / 0.000 5.252 0.000 10 Standard surface 26.226 1.378 2.139 27.560 / 0.000 5.471 0.000 11 Standard surface 389.660 22.256 5.480 0.000 12 Standard surface INF -STEP1 9.236 0.000 13 STO INF -0.522 5.413 0.000 14 Standard surface 11.608 2.952 1.438 94.520 / 0.000 5.658 0.000 15 Standard surface -47.042 1.144 5.658 0.000 16 even aspherical surface 7.816 1.378 1.536 55.980 / 0.000 5.082 0.341 17 even aspherical surface 5.005 0.251 4.701 -1.036 18 Standard surface 6.754 3.052 1.593 68.630 / 0.000 4.544 0.000 19 Standard surface -99.793 0.583 1.654 39.540 / 0.000 4.544 0.000 20 Standard surface 9.912 0.040 4.111 0.000 21 Standard surface INF STEP2 4.178 0.000 22 Standard surface 12.312 2.691 1.497 42.740 / 0.095 3.966 0.000 23 Standard surface -9.013 0.128 3.966 0.000 24 even aspherical surface -11.596 1.573 1.811 20.940 / -0.018 3.748 0.000 25 even aspherical surface -41.053 0.235 3.793 -46.270 26 even aspherical surface -6.115 0.794 1.640 23.500 / 0.000 3.738 -6.949 27 even aspherical surface 3929.550 0.052 3.786 34.392 28 even aspherical surface 3.488 2.143 1.629 24.640 / 0.000 3.937 -3.613 29 even aspherical surface 5.744 5.013 3.776 0.516 30 Standard surface INF -STEP2 0.000 31 Standard surface INF 0.700 1.517 64.200 / 0.000 0.000 32 Standard surface INF 2.985 0.000 33 Image

[0168] In Table 10 above, the surface numbers are assigned according to the surface sequence of each lens. "1" represents the object surface of the first lens, and "2" represents the image surface of the first lens. "STO" indicates the aperture stop of the lens; the radius of curvature represents the curvature of the lens surface, in mm. A positive value indicates that the surface bends towards the object surface, and a negative value indicates that the surface bends towards the image surface. "INF" indicates that the surface is flat and the radius of curvature is infinite. Thickness represents the central axial distance between the current surface and the next surface, in mm. "nd" represents the refractive power of the material between the current surface and the next surface. A blank space indicates that the current location is air with a refractive index of 1. "vd" represents the dispersion characteristics of the material between the current surface and the next surface, with a blank space indicating that the current location is air. dPgF represents the relative partial dispersion of the material. Half-aperture indicates half the aperture size of the current surface. The K value represents the magnitude of the conic coefficient of the aspherical surface.

[0169] Table 11 Zoom intervals at the wide-angle and telephoto ends of a zoom lens

[0170] Wide-angle end telephoto end STEP1 6.964 21.108 STEP2 2.019 2.082 focal length 12.202 26.180 F / # 1.775 1.771 Field of view 43.62° 19.19°

[0171] The zoom intervals in Table 11 are the different intervals at the wide-angle and telephoto ends of the lens.

[0172] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0173]

[0174] Where z is the axial sagitta in the Z-direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, numerically the reciprocal of the radius of curvature R; k is the fitted conic coefficient; a4, a6, a8, a10, a12, a14, a16 are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order higher-order aspherical coefficients corresponding to the aspherical surface, a i r i These can be combined to form higher-order terms for the corresponding aspherical surfaces.

[0175] Table 12 Design values ​​of aspherical conic coefficient in a zoom lens

[0176]

[0177] "-7.765E-04" means -7.765 * 10 -4 All other coefficients are represented in this way.

[0178] Furthermore, further still, Figure 19 The ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention is as follows: Figure 19 As shown, in a single image, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. The light rays in the image describe the aberrations of the system's principal rays. Ideally, each curve should completely coincide with the horizontal axis, at which point all light rays in that field of view are focused at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. As can be seen from the figure, the principal wavelength of this zoom lens is quite close to the horizontal axis in all fields of view, indicating that monochromatic aberrations in each field of view are well corrected.

[0179] Figure 20 This is a schematic diagram of the field curvature chromatic aberration of the zoom lens at the wide-angle end according to Embodiment 3 of the present invention. In the diagram, the vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, and the vertical vertex represents the pupil vertex. The horizontal direction represents the axial chromatic aberration at different wavelengths (specifically 436nm, 486nm, 546nm, 588nm, 656nm, and 850nm), in millimeters (mm). As shown in the figure, the system's axial chromatic aberration is within ±0.05mm, indicating that the system's chromatic aberration correction is good and it can effectively achieve the system's infrared confocal characteristic.

[0180] Figure 21 This is a transverse chromatic aberration diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention. In the diagram, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. The horizontal direction represents the offset within a meridian range with 0.546 μm as the reference, in micrometers (μm). The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). As shown in the diagram, the transverse chromatic aberration of each wavelength (specifically 436 nm, 486.1 nm, 546 nm, 587.6 nm, and 656.3 nm) is within ±10 μm, indicating that the system has good chromatic aberration correction. As the angle increases, the transverse chromatic aberrations of each wavelength overlap, indicating that the system has a certain degree of chromatic aberration correction in each field of view.

[0181] Figure 22 The ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention is as follows: Figure 22As shown, in a single image, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. The light rays in the image describe the aberrations of the system's principal rays. Ideally, each curve should completely coincide with the horizontal axis, at which point all light rays in that field of view are focused at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. As can be seen from the figure, the principal wavelength of this zoom lens is quite close to the horizontal axis in all fields of view, indicating that monochromatic aberrations in each field of view are well corrected.

[0182] Figure 23 This is a schematic diagram of the axial chromatic aberration at the telephoto end of the zoom lens provided in Embodiment 3 of the present invention. The vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, and the vertical vertex represents the pupil vertex. The horizontal direction represents the axial chromatic aberration at different wavelengths (specifically 436nm, 486nm, 546nm, 588nm, 656nm, and 850nm), in millimeters (mm). As shown in the figure, the system's axial chromatic aberration is within ±0.05mm, indicating that the system's chromatic aberration correction is good and it can effectively achieve the system's infrared confocal characteristic.

[0183] Figure 24 This is a transverse chromatic aberration diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention. In the diagram, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle. The horizontal direction represents the offset within a meridian range with 0.546 μm as the reference, in micrometers (μm). The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). As shown in the diagram, the transverse chromatic aberration of each wavelength (specifically 436 nm, 486.1 nm, 546 nm, 587.6 nm, and 656.3 nm) is within ±10 μm, indicating that the system has good chromatic aberration correction. As the angle increases, the transverse chromatic aberrations of each wavelength overlap, indicating that the system has a certain degree of chromatic aberration correction for each field of view.

[0184] In summary, the zoom lens provided in Embodiment 3 of the present invention uses a glass-plastic hybrid lens to achieve high-pixel imaging with a large 1 / 1.8” target surface, while also featuring infrared confocal lens, constant large aperture, and low cost.

[0185] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A zoom lens, characterized in that, It includes a system front group and a system back group arranged sequentially along the optical axis from the object plane to the image plane, wherein the system front group has negative optical power and the system back group has positive optical power; The optical power of the system's front group at the wide-angle end is: At the telephoto end, the optical power is ; The optical power of the system's rear group at the wide-angle end is: At the telephoto end, the optical power is ; in, , ; The front group of the system includes a first fixed lens group and a zoom lens group, and the rear group of the system includes a second fixed lens group and a compensation lens group. The first fixed lens group has positive optical power, the zoom lens group has negative optical power, the second fixed lens group has positive optical power, and the compensation lens group has positive optical power; The first fixed lens group includes a first lens, a second lens, and a third lens arranged sequentially from the object plane to the image plane. The first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power. The zoom lens group includes a fourth lens, a fifth lens, and a sixth lens. The fourth lens has negative optical power, the fifth lens has negative optical power, and the sixth lens has positive optical power. The second fixed lens group includes a seventh lens, an eighth lens, a ninth lens, and a tenth lens, wherein the seventh lens has positive optical power, the ninth lens has positive optical power, and the tenth lens has negative optical power; The compensation lens group includes an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens. The eleventh lens has positive optical power, the thirteenth lens has negative optical power, and the fourteenth lens has positive optical power. The zoom lens has fourteen lenses with optical power.

2. The zoom lens according to claim 1, characterized in that, The optical power of the first fixed lens group is The optical power of the zoom lens group is The optical power of the second fixed lens group is The optical power of the compensation lens group is The zoom lens has an optical power of [value missing] at the wide-angle end. ; in, ; ; ; .

3. The zoom lens according to claim 1, characterized in that, The optical power of the first lens is The optical power of the second lens is The optical power of the third lens is The optical power of the fourth lens is The optical power of the fifth lens is The optical power of the sixth lens is The optical power of the seventh lens is The optical power of the tenth lens is ; in, ; ; , .

4. The zoom lens according to claim 1, characterized in that, The first lens and the second lens are cemented together; the fifth lens and the sixth lens are cemented together; the ninth lens and the tenth lens are cemented together.

5. The zoom lens according to claim 4, characterized in that, The Abbe number of the first lens is vd1, the Abbe number of the second lens is vd2, the refractive index of the third lens is nd3, the Abbe number of the third lens is vd3, the refractive index of the fifth lens is nd5, the Abbe number of the fifth lens is vd5, the refractive index of the sixth lens is nd6, the Abbe number of the sixth lens is vd6, the Abbe number of the ninth lens is vd9, and the Abbe number of the tenth lens is vd10. in, , , , ; ， ， ， ； ， 。 6. The zoom lens according to claim 1, characterized in that, The first lens includes a first object-side surface near the object plane and a first image-side surface near the image plane. The first object-side surface is convex, and the first image-side surface is concave. The second lens includes a second image-side surface near the image plane, and the second image-side surface is convex. The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is concave. The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is concave, and the fourth image-side surface is concave. The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is concave, and the fifth image-side surface is concave. The seventh lens includes a seventh object-side surface near the object surface, and the seventh object-side surface is convex. The eighth lens includes an eighth object-side surface near the object plane and an eighth image-side surface near the image plane. The eighth object-side surface is convex, and the eighth image-side surface is concave. The ninth lens includes a ninth object-side surface near the object plane and a ninth image-side surface near the image plane. The ninth object-side surface is convex, and the ninth image-side surface is convex. The tenth lens includes a tenth image side surface near the image plane, and the tenth image side surface is concave. The eleventh lens includes an eleventh object-side surface near the object plane and an eleventh image-side surface near the image plane. The eleventh object-side surface is convex, and the eleventh image-side surface is convex. The twelfth lens includes a twelfth object-side surface near the object plane and a twelfth image-side surface near the image plane. The twelfth object-side surface is concave, and the twelfth image-side surface is convex. The thirteenth lens includes a thirteenth object-side surface near the object plane and a thirteenth image-side surface near the image plane. The thirteenth object-side surface is concave, and the thirteenth image-side surface is concave. The fourteenth lens includes a fourteenth object-side surface near the object plane and a fourteenth image-side surface near the image plane. The fourteenth object-side surface is convex, and the fourteenth image-side surface is concave.

7. The zoom lens according to claim 6, characterized in that, The center thickness of the thirteenth lens is The edge thickness of the thirteenth lens is The center thickness of the fourteenth lens is The edge thickness of the fourteenth lens is ; in, , .

8. The zoom lens according to claim 1, characterized in that, The zoom lens has an optical power of [missing value] at the wide-angle end. At the telephoto end, the optical power is ; in, .

9. The zoom lens according to claim 1, characterized in that, The zoom lens has an F-number of [value missing] at the wide-angle end. At the telephoto end, the F-number is ; in, .

10. The zoom lens according to claim 1, characterized in that, The zoom lens has an F-number of [value missing] at the telephoto end. ; in, .

11. The zoom lens according to claim 1, characterized in that, The zoom lens has a field of view of [missing information] at the telephoto end. ; in, .

12. The zoom lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the ninth lens, the tenth lens, and the eleventh lens are all glass spherical lenses; The eighth lens, the twelfth lens, the thirteenth lens, and the fourteenth lens are all plastic aspherical lenses.

13. The zoom lens according to claim 1, characterized in that, The zoom lens also includes an aperture stop and a filter; The aperture is disposed in the optical path between the front group and the rear group of the system; The filter is disposed in the optical path between the rear group of the system and the image plane.

Images