Lens module and terminal device

Abstract

A lens module (200, 300, 400, 500, 600, 700, 800) and a terminal device. The lens module (200, 300, 400, 500, 600, 700, 800) comprises a plurality of lenses sequentially arranged from an object side to an image side, wherein any one of the plurality of lenses has an image-side surface facing the image side and an object-side surface facing the object side; the object-side surface and the image-side surface each comprise at least one flat surface; on the flat surface, the included angle between the tangent at a point other than the surface center within an effective diameter for imaging and the tangent at the surface center is 0°-20°; at least one of the plurality of lenses is a specific-wavelength-absorbing glass lens; at least one flat surface is located on the specific-wavelength-absorbing glass lens; and an ultraviolet-infrared cut filter (201, 301, 401, 501, 601, 701, 801) is located on a flat surface on one specific-wavelength-absorbing glass lens.

Description

Lens module and terminal device TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of optical lenses, in particular to a lens module and a terminal device. BACKGROUND

[0002] Current terminal devices are usually configured with a lens module to achieve image capturing function. The lens module in the terminal device is usually designed for visible light imaging. In order to avoid infrared light from being incident on the photosensitive element of the lens module to form interference light and affect the normal imaging of the lens module, and improve the imaging quality of the lens module, the lens module is usually configured with a filter to cut off infrared light.

[0003] With the increasing demand for the shooting quality of the lens module, the number of lenses is increasing, which leads to an increase in the total height of the lens module. The presence of the filter makes the thickness of the lens module larger, and the lens is prone to ghosting phenomenon, which affects the imaging quality of the lens module. The angle drift problem of the lens transmittance also needs to be improved.

[0004] SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a lens module and a terminal device, which can meet the requirements of infrared cut-off, small angle drift amount of lens transmittance, high imaging quality and light and thin lens module without configuring a filter to cut off infrared light.

[0006] To solve the above technical problems, the present application provides a lens module, comprising: a plurality of lenses arranged in order from an object side to an image side, any lens of the plurality of lenses has an image side surface facing the image side and an object side surface facing the object side, and at least one of the object side surface and the image side surface comprises a flat surface, an included angle between a tangent of a point on the flat surface for imaging and a tangent of a center of the flat surface is 0-20°; at least one lens of the plurality of lenses is a specific wavelength absorbing glass lens, and at least one flat surface is located on the specific wavelength absorbing glass lens; an ultraviolet and infrared cut-off film, the ultraviolet and infrared cut-off film is located on the flat surface of one specific wavelength absorbing glass lens, and the ultraviolet and infrared cut-off film has an absorption effect on ultraviolet and infrared bands.

[0007] In some embodiments, an absorption coating is further included, the absorption coating absorbs light of a specific wavelength, the specific wavelength includes at least one of an ultraviolet band, an infrared band and a near-infrared band, the absorption coating and the ultraviolet and infrared cut-off film are both arranged on the flat surface of the specific wavelength absorbing glass lens, and the absorption coating is located between the cut-off film and the flat surface.

[0008] In some embodiments, an absorption coating is further included, the absorption coating absorbs light of a specific wavelength, the specific wavelength including at least one of an ultraviolet waveband, an infrared waveband, and a near-infrared waveband; a plastic lens is further included, another of the flat surfaces is located on the plastic lens, the UV-IR cut film is disposed on the flat surface of the specific wavelength absorption glass lens, and the absorption coating is disposed on the flat surface of the plastic lens.

[0009] In some embodiments, the specific wavelength absorption glass lens is a blue glass lens.

[0010] In some embodiments, an absorption coating is further included, the absorption coating absorbs light of a specific wavelength, the specific wavelength including at least one of an ultraviolet waveband, an infrared waveband, and a near-infrared waveband; a plastic lens is further included, another of the flat surfaces is located on the plastic lens, the UV-IR cut film is disposed on the flat surface of the specific wavelength absorption glass lens, and the absorption coating is disposed on the flat surface of the plastic lens.

[0011] In some embodiments, an absorption coating is further included, the absorption coating absorbs light of a specific wavelength, the specific wavelength including at least one of an ultraviolet waveband, an infrared waveband, and a near-infrared waveband; a plastic lens is further included, another of the flat surfaces is located on the plastic lens, the UV-IR cut film is disposed on the flat surface of the specific wavelength absorption glass lens, and the absorption coating is disposed on the flat surface of the plastic lens.

[0012] In some embodiments, an absorption coating is further included, the absorption coating absorbs light of a specific wavelength, the specific wavelength including at least one of an ultraviolet waveband, an infrared waveband, and a near-infrared waveband; a plastic lens is further included, another of the flat surfaces is located on the plastic lens, the UV-IR cut film is disposed on the flat surface of the specific wavelength absorption glass lens, and the absorption coating is disposed on the flat surface of the plastic lens.

[0013] In some embodiments, an absorption coating is further included, the absorption coating absorbs light of a specific wavelength, the specific wavelength including at least one of an ultraviolet waveband, an infrared waveband, and a near-infrared waveband; a plastic lens is further included, another of the flat surfaces is located on the plastic lens, the UV-IR cut film is disposed on the flat surface of the specific wavelength absorption glass lens, and the absorption coating is disposed on the flat surface of the plastic lens.

[0014] In some embodiments, the specific wavelength absorption glass lens is a blue glass lens. Another aspect of the present application provides a terminal device comprising the lens module described in the above embodiments.

[0015] The beneficial effects of the present application are that the lens module comprises an ultraviolet-infrared cutoff film, which can absorb light in the ultraviolet and infrared wave bands, and can replace the filter in the related art. Since the filter in the related art is not used, the thickness of the lens module can be reduced, making the lens module lightweight and thin. The lens module can comprise at least one specific wavelength absorption glass lens among the plurality of lenses. The ultraviolet-infrared cutoff film is arranged on the flat surface of the specific wavelength absorption glass lens. The flat surface is relatively flat, so that the spectral drift at the center and edge positions of the lens can be small. At the same time, the specific wavelength absorption glass lens makes the angle deviation of the transmittance of the lens module about the incident angle small, thereby improving the transmittance angle deviation problem in the related art. The lens module of the present application has a higher infrared cutoff absorption value and higher imaging quality. The lens module can further comprise at least one specific wavelength absorption glass lens and at least one second glass lens among the plurality of lenses. The ultraviolet-infrared cutoff film can be arranged on the flat surface of the specific wavelength absorption glass lens or on the flat surface of the second glass lens. The flat surface is relatively flat, so that the spectral drift at the center and edge positions of the lens can be small, and the angle deviation of the lens module can be small, thereby improving the angle deviation problem in the related art. The lens module of the present application has a higher infrared cutoff absorption value and higher imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are illustrated by way of example in the drawings that are for illustrative purposes only, and not for the purposes of limiting the embodiments, unless otherwise explicitly stated in the specification. The drawings in the accompanying drawings are not necessarily to scale, unless otherwise explicitly stated in the specification. In order to more clearly illustrate the technical solutions in the embodiments or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] FIG. 1 is a structural schematic diagram of a lens module in the related art;

[0018] FIG. 2 is a structural schematic diagram of a lens module according to an embodiment of the present application;

[0019] FIG. 3 is a structural schematic diagram of a first lens in the lens module according to an embodiment of the present application;

[0020] FIG. 4 is a partial structural schematic diagram of FIG. 3;

[0021] Fig. 5 is a schematic diagram of a structure of a lens module according to an embodiment of the present application;

[0022] Fig. 6 is a schematic diagram of a structure of a lens module according to another embodiment of the present application;

[0023] Fig. 7 is a schematic diagram of a structure of a lens module according to another embodiment of the present application;

[0024] Fig. 8 is a schematic diagram of a structure of a lens module according to another embodiment of the present application;

[0025] Fig. 9 is a schematic diagram of a structure of a lens module according to another embodiment of the present application;

[0026] Fig. 10 is a schematic diagram of a structure of a lens module according to another embodiment of the present application;

[0027] Fig. 11 is a schematic diagram of a structure of a lens module according to a comparative example;

[0028] Fig. 12 is a transmittance curve diagram of light rays at 0° and 30° incident angles of the lens module according to the comparative example 1;

[0029] Fig. 13 is a transmittance curve diagram of light rays at 0° and 30° incident angles of the lens module according to the comparative example 2;

[0030] Fig. 14 is a transmittance curve diagram of light rays at 0° and 30° incident angles of the lens module according to the embodiment 1;

[0031] Fig. 15 is a transmittance curve diagram of light rays at 0° and 30° incident angles of the lens module according to the embodiment 2;

[0032] Fig. 16 is a schematic diagram of internal transmittance curves of the blue glass lens under light irradiation according to the comparative example 1, the embodiment 1 and the embodiment 2;

[0033] Fig. 17 is a schematic diagram of internal transmittance curves of the dyed plastic lens under light irradiation according to the comparative example 2;

[0034] Fig. 18 is a schematic diagram of transmittance curves of the blue glass lens under light irradiation according to the embodiment 2;

[0035] Fig. 19 is a schematic diagram of a ghosting simulation of the lens module according to the comparative example 1;

[0036] Fig. 20 is an enlarged schematic diagram of the A1 region in Fig. 19;

[0037] Fig. 21 is an enlarged schematic diagram of the B1 region in Fig. 19;

[0038] Fig. 22 is a schematic diagram of a ghosting simulation of the lens module according to the comparative example 2;

[0039] Fig. 23 is a schematic diagram of a ghosting simulation of the lens module according to the embodiment 1;

[0040] Figure 24 is a schematic diagram of a ghosting simulation of the lens module in Example Two.

[0041] Figure 25 is a schematic diagram of a ghosting simulation of the lens module in Comparative Example One.

[0042] Figure 26 is a schematic diagram of an enlarged view of the A2 region in Figure 25.

[0043] Figure 27 is a schematic diagram of an enlarged view of the B2 region in Figure 25.

[0044] Figure 28 is a schematic diagram of a ghosting simulation of the lens module in Comparative Example Two.

[0045] Figure 29 is a schematic diagram of a ghosting simulation of the lens module in Example One.

[0046] Figure 30 is a schematic diagram of a ghosting simulation of the lens module in Example Two.

[0047] Figure 31 is a schematic diagram of a ghosting simulation of the lens module in Comparative Example One.

[0048] Figure 32 is a schematic diagram of a ghosting simulation of the lens module in Comparative Example Two.

[0049] Figure 33 is a schematic diagram of an enlarged view of the A3 region in Figure 32.

[0050] Figure 34 is a schematic diagram of an enlarged view of the B3 region in Figure 32.

[0051] Figure 35 is a schematic diagram of a ghosting simulation of the lens module in Example One.

[0052] Figure 36 is a schematic diagram of a ghosting simulation of the lens module in Example Two.

[0053] Figure 37 is a schematic diagram of a ghosting simulation of the lens module in Comparative Example One.

[0054] Figure 38 is a schematic diagram of an enlarged view of the A4 region in Figure 37.

[0055] Figure 39 is a schematic diagram of a ghosting simulation of the lens module in Comparative Example Two.

[0056] Figure 40 is a schematic diagram of a ghosting simulation of the lens module in Example One.

[0057] Figure 41 is a schematic diagram of a ghosting simulation of the lens module in Example Two. DETAILED DESCRIPTION

[0058] Figure 1 is a schematic diagram of a structure of a lens module in the related art.

[0059] Referring to FIG. 1, a lens module 100 in the related art includes a plurality of lenses arranged in order from an object side to an image side. In FIG. 1, seven lenses are taken as an example, which include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The lens module 100 further includes a glass filter GF.

[0060] The glass filter GF is used to absorb light in an infrared band to improve the optical quality of the lens module. However, the glass filter GF occupies a certain space, making the thickness of the lens module 100 larger, and is prone to ghosting phenomenon to affect the imaging quality of the lens module 100, and the angle drift problem of the lens module remains to be improved.

[0061] The embodiment of the present application provides a lens module, which comprises a plurality of lenses arranged in sequence from an object side to an image side, any lens of the plurality of lenses has an image side surface facing the image side and an object side surface facing the object side, at least one of the object side surface and the image side surface is a flat surface, and the included angle between the tangent of a point on the flat surface except the center of the surface and the tangent of the center of the flat surface is 0-20 degrees; at least one lens of the plurality of lenses is a specific wavelength absorption glass lens, and the at least one flat surface is located on the specific wavelength absorption glass lens; and an ultraviolet and infrared cutoff film is located on the flat surface of the specific wavelength absorption glass lens. The ultraviolet and infrared cutoff film is arranged on the flat surface of the specific wavelength absorption glass lens, so that the filter in the related art is replaced, thereby reducing the thickness of the lens module of the embodiment of the present application. The ultraviolet and infrared cutoff film is located on the flat surface of the specific wavelength absorption glass lens, the included angle between the tangent of a point on the flat surface except the center of the surface and the tangent of the center of the flat surface in the optical effective diameter for imaging is 0-20 degrees, the value of the included angle is small, the spectral drift of the lens center and the edge position is small, thereby the lens module of the embodiment of the present application can improve the angle drift problem, the infrared cutoff absorption value of the lens module of the embodiment of the present application is high, the ghost phenomenon can be weakened, and the imaging quality of the lens module is improved. The embodiment of the present application also provides a lens module, which comprises a plurality of lenses arranged in sequence from an object side to an image side, any lens of the plurality of lenses has an image side surface facing the image side and an object side surface facing the object side, at least one of the object side surface and the image side surface is a flat surface, the included angle between the tangent of a point on the flat surface except the center of the surface and the tangent of the center of the flat surface in the optical effective diameter for imaging is 0-20 degrees, the optical effective diameter for imaging refers to the lens area through which the light can pass and reach the optical imaging sensor to participate in imaging after passing through the lens, and the corresponding structure area for supporting and fixing the lens is arranged outside the optical effective diameter; the plurality of lenses comprises at least one specific wavelength absorption glass lens and at least one second glass lens; and an ultraviolet and infrared cutoff film is arranged on the flat surface of the specific wavelength absorption glass lens or the flat surface of the second glass lens. The existence of the ultraviolet and infrared cutoff film can replace the filter of the lens module in the related art, thereby reducing the thickness of the lens module of the embodiment of the present application. The ultraviolet and infrared cutoff film can be arranged on the flat surface of the specific wavelength absorption glass lens or the second glass lens, the flat surface is relatively flat, the spectral drift of the lens center and the edge position is small, the angle drift problem of the lens module can be improved, the infrared cutoff absorption value of the lens module of the embodiment of the present application is high, the ghost phenomenon can be weakened, and the imaging quality of the lens module is improved.

[0062] In order to make the objects, technical solutions and advantages of the present application clearer, the various embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the various embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and various changes and modifications based on the following various embodiments.

[0063] Fig. 2 is a structural schematic diagram of a lens module provided by an embodiment of the present application.

[0064] Referring to Fig. 2, the first embodiment of the present application provides a lens module 200, which comprises: a plurality of lenses arranged in order from an object side to an image side, any lens of the plurality of lenses has an image side surface facing the image side and an object side surface facing the object side, and at least one of the object side surface and the image side surface comprises a flat surface, an included angle between a tangent of a point within an optical effective diameter for imaging on the flat surface and a tangent of a center of the flat surface is 0°-20°, at least one lens of the plurality of lenses is a specific wavelength absorption glass lens, and at least one flat surface is located on the specific wavelength absorption glass lens. The lens module 200 further comprises an ultraviolet-infrared cutoff film 201, which is located on a flat surface of a specific wavelength absorption glass lens, the ultraviolet-infrared cutoff film 201 has an absorption effect on ultraviolet and infrared light, and a cutoff wavelength range is 350-420 nm and 690-1200 nm. This embodiment takes seven lenses as an example, which comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7.

[0065] In this embodiment, the first lens L1 is a specific wavelength absorption glass lens, the second lens L2 is a plastic lens, the third lens L3 is a plastic lens, the fourth lens L4 is a plastic lens, the fifth lens L5 is a plastic lens, the sixth lens L6 is a plastic lens, and the seventh lens L7 is a plastic lens.

[0066] It can be understood that the embodiment of the present application takes seven lenses as an example, and the number of lenses in the lens module can be other numbers in other embodiments, for example, three, four, five, six or eight, etc. The embodiment of the present application takes a specific wavelength absorption glass lens in the lens module as an example, and the ultraviolet and infrared cutoff film is located on the flat surface of the glass lens. In other embodiments, the number of specific wavelength absorption glass lenses in the lens module can be more than one, for example, two, three, etc. When the number of glass lenses in the lens module is more than one, the ultraviolet and infrared cutoff film can be located on the flat surface of any specific wavelength absorption glass lens. The first lens L1 in the lens module of the embodiment of the present application is taken as an example of a specific wavelength absorption glass lens, and in other embodiments, other lenses, for example, the second lens L2, the third lens L3 or the fourth lens L4, etc. can be specific wavelength absorption glass lenses. The first lens L1 image side surface is taken as an example of a flat surface in this embodiment, and in fact, the object surface of the first lens L1 can also be a flat surface.

[0067] The specific wavelength absorption glass lens has an absorption effect on 550nm-1100nm, can absorb infrared band light, thereby improving the infrared cutoff absorption value of the lens module 200, and can be a blue glass lens or a dyed glass that has an absorption effect on the infrared band.

[0068] In this embodiment, the first lens L1 can be a blue glass lens, which is made of blue glass material as raw material. Its function is to filter infrared light by absorption. Because the blue wavelength has high transmittance, the blue glass lens has better transmittance than other glass lenses. In other embodiments, the first lens L1 can also be a green glass lens, which absorbs infrared band light.

[0069] In this embodiment, the plurality of lenses of the lens module 200 can be aspherical lenses. Aspherical lenses can provide more natural and less visually distorted visual effects, making the view look more realistic, and can improve the optical performance of the lens module 200. Aspherical lenses also have high durability and wear resistance, which can improve the reliability of the lens module 200.

[0070] In other embodiments, the lenses in the lens module can also be spherical lenses.

[0071] The first lens L1 can be made by wafer level glass technology (WLG), glass mold technology (GMO) or wafer level optical technology (WLO). The WLG wafer level glass technology is to process a glass wafer through a series of processes such as softening, high-precision mold alignment heating forming, cutting, cleaning, film coating, etc. The GMO glass mold technology is to process a glass blank through heating, mold forming, cooling, material taking, film coating, etc. The WLO wafer level optical technology is to coat optical glue on the glass substrate, and then perform light curing forming, and finally cutting forming. Among them, the WLG technology has advantages in mass production feasibility, production efficiency, lens precision and performance, etc., which can improve the quality and production efficiency of the lens module 200.

[0072] FIG. 3 is a structural schematic diagram of the first lens in the lens module according to the embodiment of the present application. FIG. 4 is a partial structural schematic diagram of FIG. 3.

[0073] Referring to FIGS. 3 and 4 simultaneously, the included angle between the tangent of the point on the flat surface within the optical effective diameter for imaging and the tangent of the center of the flat surface is 0°-20°, for example, 0°, 3°, 6°, 9°, 12°, 15°, 18° or 20°. The included angles α1 and α2 shown in FIG. 4 are both less than 20°. In fact, the included angles of the tangents of the points on the flat surface except the center of the flat surface are different, but the values of the included angles are all within the range of 0°-20°. The included angles within this range can make the spectral angle drift of the center and the edge of the first lens smaller, so that the lens module 200 can improve the angle drift problem.

[0074] It can be understood that FIG. 4 shows the case of the smooth surface of the first lens according to the embodiment, and the smooth surface on other lenses can also refer to FIG. 4.

[0075] The ultraviolet and infrared cut film 201 is an IRCUT (Infra-Red Cut) film, which is used to cut off the light in the infrared band. The ultraviolet and infrared cut film 201 has a high infrared cut-off absorption value, so that the infrared cut-off absorption value of the lens module 200 is high.

[0076] It should be noted that if the ultraviolet and infrared cutoff film is deposited on the surface of the plastic lens such as resin lens, there are problems of low film performance, large surface shape change, poor stability, poor reliability and the like; if the ultraviolet and infrared cutoff film is deposited on the surface of the white glass lens, the film color will present red color affecting the appearance color of the lens. If the ultraviolet and infrared cutoff film is deposited on the specific wavelength absorption glass lens, the film color will not appear red problem, and has the advantages of high film performance, small surface shape change, good stability, good reliability and the like. Therefore, the ultraviolet and infrared cutoff film is deposited on the specific wavelength absorption glass lens in the embodiment of the application, which can improve the imaging quality of the lens module.

[0077] Optionally, the ultraviolet and infrared cutoff film 201 can be deposited on the flat surface of the first lens L1 by an atomic layer deposition process, so that the ultraviolet and infrared cutoff film 201 has high uniformity and density on the flat surface of the first lens L1, and the reliability of the cutoff film 201 in filtering infrared light can be improved.

[0078] Optionally, the ultraviolet and infrared cutoff film 201 can also be deposited on the flat surface of the first lens L1 by a physical vapor deposition process (PVD), which can achieve a high film deposition rate, so that the ultraviolet and infrared cutoff film 201 has a fast deposition rate on the first lens L1, thereby improving the production efficiency of the lens module 200; PVD can also be performed at low temperature, reducing the thermal stress and oxidation risk of the substrate material, so that the ultraviolet and infrared cutoff film 201 can have high crystallinity, density and flatness, thereby improving the reliability of the lens module 200; compared with other deposition technologies, PVD does not need to use chemical reaction or high-temperature heat source, which can reduce energy consumption.

[0079] Optionally, the lens module 200 further comprises an anti-reflection film 202 located on the object side and the image side of the lens. The anti-reflection film 202, also known as AR (anti-reflection) film or anti-reflection film, is used to reduce or eliminate the reflected light of the optical surface such as prism, plane mirror and the like, thereby increasing the light transmittance of the lens, so that the light can be maximally presented to the user, and the optical performance of the lens module 200 can be improved.

[0080] Figure 5 is a structural schematic diagram of a lens module provided by the second embodiment of the application.

[0081] Referring to Figure 5, the second embodiment of the application provides a lens module 300. The second embodiment is basically the same as the first embodiment, and the symbol meanings are the same as those of the first embodiment; the ultraviolet and infrared cutoff film 301 and the anti-reflection film 302 can be referred to the corresponding description of the first embodiment, which will not be repeated here.

[0082] In the embodiment, the first lens L1 is a specific wavelength absorption glass lens, the second lens L2 is a plastic lens, the third lens L3 is a plastic lens, the fourth lens L4 is a plastic lens, the fifth lens L5 is a plastic lens, the sixth lens L6 is a plastic lens, and the seventh lens L7 is a plastic lens.

[0083] The lens module 300 further comprises an absorption coating 303, the absorption coating 303 absorbs light of specific wavelengths, the specific wavelengths comprising at least one of ultraviolet, infrared and near-infrared wavebands, and when the absorption coating 303 has absorption effect on light of the infrared waveband, the infrared cut-off absorption value of the lens module 300 can be improved, and meanwhile the transmittance difference between different incident angles can be further reduced.

[0084] In the embodiment, the absorption coating 303 and the ultraviolet-infrared cut-off film 301 are both arranged on the flat surface of the first lens L1, and the absorption coating 303 is located between the ultraviolet-infrared cut-off film 301 and the flat surface of the first lens L1. The absorption coating 303 can be prepared on the flat surface of the first lens L1 by using a spin coating process, which is simple in operation and low in cost, and is conducive to improving the preparation efficiency of the absorption coating 303 and reducing the production cost, and the flat surface is relatively flat, which can improve the reliability of the absorption coating 303 on the first lens L1.

[0085] In the embodiment, the absorption coating 303 is located between the flat surface of the first lens L1 and the ultraviolet-infrared cut-off film 301. When the absorption coating 303 and the ultraviolet-infrared cut-off film 301 are prepared on the first lens L1, compared with the scheme of first depositing the ultraviolet-infrared cut-off film 301 on the first lens L1 and then spin coating the absorption coating 303 on the surface of the ultraviolet-infrared cut-off film 301, the scheme of first spin coating the absorption coating 303 on the first lens L1 and then depositing the ultraviolet-infrared cut-off film 301 on the absorption coating 303 will not cause the problem of insufficient adhesion of the absorption coating 303 caused by spin coating the absorption coating 303 on the ultraviolet-infrared cut-off film 301, so that the absorption coating 303 located between the flat surface of the first lens L1 and the ultraviolet-infrared cut-off film 301 can improve the reliability of the lens module 300.

[0086] FIG. 6 is a structural schematic diagram of a lens module provided by a third embodiment of the present application.

[0087] Referring to FIG. 6, a second embodiment of the present application provides a lens module 400. The third embodiment is basically the same as the first embodiment, and the symbol meanings are the same as those of the first embodiment. The ultraviolet-infrared cut-off film 401 and the anti-reflection film 402 can refer to the corresponding description of the first embodiment, which will not be described here.

[0088] In the embodiment, the first lens L1 is a specific wavelength absorption glass lens, the second lens L2 is a plastic lens, the third lens L3 is a plastic lens, the fourth lens L4 is a plastic lens, the fifth lens L5 is a plastic lens, the sixth lens L6 is a plastic lens, and the seventh lens L7 is a plastic lens.

[0089] The lens module 400 further comprises an absorption coating 403, the absorption coating 403 absorbs light of specific wavelengths, the specific wavelengths including at least one of the ultraviolet waveband, the infrared waveband, and the near-infrared waveband, and the absorption coating 403 has absorption effect on light of the infrared waveband, so that the infrared cut-off absorption value of the lens module 400 can be further improved.

[0090] The absorption coating 403 is located on the flat surface of the third lens L3. The absorption coating 403 can be prepared on the flat surface of the third lens L3 by using a spin coating process, which is simple to operate and low in cost, and is conducive to improving the preparation efficiency of the absorption coating 403 and reducing the production cost, and the flat surface is relatively flat, so that the reliability of the absorption coating 403 on the third lens L3 can be improved.

[0091] It can be understood that the absorption coating is taken as an example on the third lens L3 in the embodiment, and in other embodiments, the absorption coating can also be located on the smooth surface of other plastic lenses.

[0092] FIG. 7 is a structural schematic diagram of a lens module provided by an embodiment four of the present application.

[0093] Referring to FIG. 7, a fourth embodiment of the present application provides a lens module 500, which comprises: a plurality of lenses arranged in order from an object side to an image side, any lens of the plurality of lenses has an image side surface facing the image side and an object side surface facing the object side, at least one of the object side surface and the image side surface includes a flat surface, an included angle between a tangent of a point in an optical effective diameter for imaging on the flat surface and a tangent of a center of the flat surface is 0°-20°, and the plurality of lenses includes at least one specific wavelength absorption glass lens and at least one second glass lens. The lens module 200 further comprises an ultraviolet and infrared cut-off film 201, the ultraviolet and infrared cut-off film 201 is arranged on the flat surface of the second glass lens, and the ultraviolet and infrared cut-off film 201 has absorption effect on light of the infrared waveband. The embodiment takes seven lenses as an example, which includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

[0094] In the embodiment, the first lens L1 is a specific wavelength absorption glass lens, the second lens L2 is a plastic lens, the third lens L3 is a second glass lens, the fourth lens L4 is a plastic lens, the fifth lens L5 is a plastic lens, the sixth lens L6 is a plastic lens, and the seventh lens L7 is a plastic lens.

[0095] It can be understood that the embodiment of the present application takes seven lenses as an example, and in other embodiments, the number of lenses of the lens module can be other numbers, for example, three, four, five, six, eight, and the like. The embodiment of the present application takes the lens module containing one specific wavelength absorption glass lens and one second glass lens as an example, and the ultraviolet and infrared cutoff film can be located on the flat surface of the second glass lens. In other embodiments, the ultraviolet and infrared cutoff film can also be located on the flat surface of the specific wavelength absorption glass lens. The embodiment of the present application takes the first lens L1 as the specific wavelength absorption glass lens in the lens module as an example, and in other embodiments, other lenses, for example, the second lens L2, the third lens L3, or the fourth lens L4, can be the specific wavelength absorption glass lens. The embodiment of the present application takes the third lens L3 as the second glass lens in the lens module as an example, and in other embodiments, other lenses, for example, the first lens L1, the second lens L2, or the fourth lens L4, can be the second glass lens.

[0096] The second glass lens is a lens made of glass, which can be a white glass lens and the like.

[0097] The specific wavelength absorption glass lens, the ultraviolet and infrared cutoff film 501, and the antireflection film 502 in the embodiment can refer to the corresponding description of the first embodiment, which will not be repeated here.

[0098] FIG. 8 is a structural schematic diagram of a lens module provided by an embodiment of the present application.

[0099] Referring to FIG. 8, the fifth embodiment of the present application provides a lens module 600. The fifth embodiment is basically the same as the fourth embodiment, and the symbol meanings are the same as those of the first embodiment. The ultraviolet and infrared cutoff film 601 and the antireflection film 602 can refer to the corresponding description of the fourth embodiment, which will not be repeated here.

[0100] In the embodiment, the first lens L1 is a specific wavelength absorption glass lens, the second lens L2 is a plastic lens, the third lens L3 is a second glass lens, the fourth lens L4 is a plastic lens, the fifth lens L5 is a plastic lens, the sixth lens L6 is a plastic lens, and the seventh lens L7 is a plastic lens.

[0101] The lens module 600 further includes an absorption coating 603, which absorbs light of a specific wavelength, the specific wavelength including at least one of an ultraviolet waveband, an infrared waveband, and a near-infrared waveband. When the absorption coating 603 has an absorption effect on the infrared waveband, the infrared cutoff absorption value of the lens module 600 can be improved.

[0102] In the embodiment, the absorbing coating 603 and the ultraviolet-infrared cutoff film 601 are both arranged on the flat surface of the third lens L3, and the absorbing coating 603 is located between the ultraviolet-infrared cutoff film 301 and the flat surface of the third lens L3. Compared with the scheme of first depositing the ultraviolet-infrared cutoff film 601 on the third lens L3 and then spin-coating the absorbing coating 603 on the surface of the ultraviolet-infrared cutoff film 601, the scheme of first spin-coating the absorbing coating 603 on the third lens L3 and then depositing the ultraviolet-infrared cutoff film 601 on the absorbing coating 603 can not cause the problem of insufficient adhesion of the absorbing coating 603 caused by spin-coating the absorbing coating 603 on the ultraviolet-infrared cutoff film 301, so that the absorbing coating 603 located between the flat surface of the third lens L3 and the ultraviolet-infrared cutoff film 601 can improve the reliability of the lens module 600.

[0103] FIG. 9 is a structural schematic diagram of a lens module provided by an embodiment of the present application.

[0104] Referring to FIG. 9, a sixth embodiment of the present application provides a lens module 700. The sixth embodiment is basically the same as the fourth embodiment, and the symbol meanings are the same as those of the fourth embodiment; the ultraviolet-infrared cutoff film 701 and the antireflection film 702 can refer to the corresponding descriptions of the fourth embodiment, which will not be described herein.

[0105] In the embodiment, the first lens L1 is a specific wavelength absorbing glass lens, the second lens L2 is a plastic lens, the third lens L3 is a second glass lens, the fourth lens L4 is a plastic lens, the fifth lens L5 is a plastic lens, the sixth lens L6 is a plastic lens, and the seventh lens L7 is a plastic lens.

[0106] The lens module 700 further includes an absorbing coating 703, the absorbing coating 703 absorbs light of a specific wavelength, the specific wavelength including at least one of an ultraviolet waveband, an infrared waveband and a near-infrared waveband, and the absorbing coating 703 has an absorption effect on light of the infrared waveband, so that the infrared cutoff absorption value of the lens module 700 can be further improved.

[0107] It can be understood that, in the embodiment, the ultraviolet-infrared cutoff film 701 is arranged on the flat surface of the specific wavelength absorbing glass lens, and the absorbing coating 703 is arranged on the flat surface of the second glass lens. In other embodiments, the ultraviolet-infrared cutoff film 701 can be arranged on the flat surface of the second glass lens, and the absorbing coating 703 can be arranged on the flat surface of the second glass lens.

[0108] FIG. 10 is a structural schematic diagram of a lens module provided by an embodiment of the present application.

[0109] Referring to FIG. 10, a seventh embodiment of the present application provides a lens module 800. The seventh embodiment is basically the same as the fourth embodiment, and the symbol meanings are the same as those of the fourth embodiment; the ultraviolet-infrared cutoff film 801 and the anti-reflection film 802 can refer to the corresponding descriptions of the fourth embodiment, and will not be repeated here.

[0110] In the present embodiment, the first lens L1 is a special wavelength absorption glass lens, the second lens L2 is a second glass lens, the third lens L3 is a plastic lens, the fourth lens L4 is a plastic lens, the fifth lens L5 is a plastic lens, the sixth lens L6 is a plastic lens, and the seventh lens L7 is a plastic lens.

[0111] The lens module 800 further comprises an absorption coating 803, which absorbs light of a specific wavelength, the specific wavelength including at least one of the ultraviolet waveband, the infrared waveband and the near-infrared waveband. When the absorption coating 803 has absorption effect on the infrared waveband, the infrared cutoff absorption value of the lens module 800 can be improved.

[0112] In the present embodiment, the absorption coating 803 is arranged on the flat surface of the plastic lens.

[0113] FIG. 11 is a structural schematic view of a lens module provided by a comparative example two.

[0114] Referring to FIG. 11, the lens module 900 in the comparative example two, the symbol meanings of the comparative example two are the same as those of the first embodiment; the ultraviolet-infrared cutoff film 901 and the anti-reflection film 902 can refer to the corresponding descriptions of the first embodiment, and will not be repeated here.

[0115] Table 1 shows the lens conditions in the lens modules of the comparative example one, the comparative example two, the first embodiment and the second embodiment.

[0116] Table 1

[0117] The structures of the lens modules of the comparative example one and the comparative example two in Table 1 can refer to FIG. 1 and FIG. 11 respectively, and the structures of the lens modules of the first embodiment and the second embodiment can refer to FIG. 2 and FIG. 5 respectively. R1 and R2 in Table 1 correspond to the object side surface and the image side surface of the lens respectively.

[0118] The lens module provided by the comparative example two also does not include a filter, although the ultraviolet-infrared cutoff film is used in the comparative example two to replace the filter in the comparative example one to make the lens module thinner, however, the angle drift problem and the strong ghost phenomenon still exist in the comparative example two, which will be analyzed in combination with the drawings below.

[0119] Fig. 12 is a transmittance curve diagram of the light ray 0° incidence and 30° incidence of the lens module in the comparative example one; Fig. 13 is a transmittance curve diagram of the light ray 0° incidence and 30° incidence of the lens module in the comparative example two; Fig. 14 is a transmittance curve diagram of the light ray 0° incidence and 30° incidence of the lens module in the embodiment one; Fig. 15 is a transmittance curve diagram of the light ray 0° incidence and 30° incidence of the lens module in the embodiment two. Wherein, the solid line is the 0° incidence angle, and the dotted line is the 30° incidence angle.

[0120] Meanwhile, referring to Figs. 12-15, in the lens modules of the comparative example one, the comparative example two and the embodiment one, there is an angle drift problem at the 0° incidence angle and the 30° incidence angle, wherein the angle drift amount of the embodiment one is slightly lower than that of the comparative example one, the angle drift amount of the embodiment two is smaller, and is obviously smaller than that of the comparative example one, the comparative example two and the comparative example three. Therefore, the lens module of the embodiment can improve the angle drift problem in the related art.

[0121] Fig. 16 is a transmittance curve diagram of the light irradiation on the blue glass lens in the comparative example one, the embodiment one and the embodiment two.

[0122] Referring to Fig. 16, the blue glass lens in the comparative example one, the embodiment one and the embodiment two has obvious absorption at 550nm-1100nm, and has stronger absorption at about 830nm. It can be understood that the blue glass lens in the comparative example one is the filter in the comparative example one, the blue glass lens in the embodiment one is the first lens, and the blue glass lens in the embodiment two is the first lens. The blue glass lens in the comparative example one, the embodiment one and the embodiment two has absorption to the infrared waveband light, thereby indicating that the first lens in the embodiment one and the embodiment two can replace the filter in the comparative example one, so that the lens module in the embodiment one and the embodiment two can be more lightweight.

[0123] Fig. 17 is a transmittance curve diagram of the light irradiation on the dyed plastic lens in the comparative example two.

[0124] Referring to Fig. 17, the dyed plastic lens in the comparative example two has obvious absorption at 380nm-480nm and 600nm-800nm, and has stronger absorption at about 710nm. The dyed plastic lens in the comparative example two has stronger absorption to the infrared waveband, thereby making the lens module in the comparative example two have higher infrared cutoff absorption value.

[0125] Fig. 18 is a transmittance curve diagram of the light irradiation on the blue glass lens in the embodiment two.

[0126] Referring to FIG. 18, the absorption coating in Embodiment Two has obvious absorption at 380 nm-480 nm and 580 nm-800 nm, and has relatively strong absorption at about 380 nm and 700 nm-750 nm. The absorption coating has relatively strong absorption to light in the infrared band, which can improve the infrared cutoff absorption value of the lens module in Embodiment Two.

[0127] FIG. 19 is a schematic diagram of a ghost simulation of the lens module in Comparative Example One, and FIG. 20 is an enlarged schematic diagram of the A1 region in FIG. 19, the light path of which is as follows: the light incident at 0° from the object side is reflected on the object side of the filter after passing through all the lenses, then passes through the seventh lens, the sixth lens and the fifth lens in turn, is reflected on the object side of the fifth lens, and then passes through the sixth lens, the seventh lens and the filter in turn to reach the imaging surface. FIG. 21 is an enlarged schematic diagram of the B1 region in FIG. 19, the light path of which is as follows: the light incident at 0° from the object side is reflected on the object side of the filter after passing through all the lenses, then passes through the seventh lens, is reflected on the image side of the sixth lens, and then passes through the seventh lens and the filter in turn to reach the imaging surface. FIG. 22 is a schematic diagram of a ghost simulation of the lens module in Comparative Example Two, and FIG. 23 is a schematic diagram of a ghost simulation of the lens module in Embodiment One, and FIG. 24 is a schematic diagram of a ghost simulation of the lens module in Embodiment Two.

[0128] Referring to FIGS. 19-24, Comparative Examples One and Two and Embodiments One and Two all use the same optical design lens, and the Lighttools software is used to simulate and simulate the ghost, and FIGS. 19-24 can be obtained. As can be seen from the figures, compared with the ghost phenomenon of the lens module in Comparative Example One, the ghost phenomenon of the lens modules in Comparative Examples Two, Embodiments One and Two is obviously weakened after the filter is removed, and the imaging quality of the lens modules in Comparative Examples Two, Embodiments One and Two is better than that of the lens module in Comparative Example One. The ghost phenomenon of the lens module in Embodiment Two is the weakest, and the imaging quality of the lens module in Embodiment Two is the best.

[0129] Figure 25 is a ghost simulation diagram of the lens module in Comparative Example 1, Figure 26 is an enlarged diagram of the A2 region in Figure 25, and the light path is: the light ray incident from the object side at 5° is reflected on the object side of the filter after passing through all the lenses, then passes through the seventh lens, is reflected on the object side of the seventh lens, and then passes through the seventh lens and the filter in sequence to reach the imaging surface. Figure 27 is an enlarged diagram of the B2 region in Figure 25, and the light path is: the light ray incident from the object side at 5° is reflected on the object side of the filter after passing through all the lenses, then passes through the seventh lens and the sixth lens in sequence, is reflected on the image side of the fifth lens, and then passes through the sixth lens, the seventh lens and the filter in sequence to reach the imaging surface. Figure 28 is a ghost simulation diagram of the lens module in Comparative Example 2, Figure 29 is a ghost simulation diagram of the lens module in Comparative Example 3, and Figure 30 is a ghost simulation diagram of the lens module in Embodiment 1.

[0130] Meanwhile, with reference to Figures 25 to 30, compared with the ghost phenomenon of the lens module in Comparative Example 1, the ghost phenomenon of the lens modules in Comparative Example 2, Embodiment 1 and Embodiment 2 is obviously weakened after the filter is cancelled, and the imaging quality of the lens modules in Comparative Example 2, Embodiment 1 and Embodiment 2 is better than that of the lens module in Comparative Example 1. The ghost phenomenon of the lens module in Embodiment 2 is the weakest, and the imaging quality of the lens module in Embodiment 2 is the best.

[0131] Figure 31 is a ghost simulation diagram of the lens module in Comparative Example 1, Figure 32 is a ghost simulation diagram of the lens module in Comparative Example 2, Figure 33 is an enlarged diagram of the A3 region in Figure 32, and the light path is: the light ray incident from the object side at 35° passes through the first lens, the second lens, the third lens, the fourth lens and the fifth lens, is reflected on the object side of the sixth lens, then passes through the fifth lens, the fourth lens, the third lens and the second lens, is reflected on the image side of the first lens, then passes through the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the filter in sequence to reach the imaging surface. Figure 34 is an enlarged diagram of the B3 region in Figure 32, and the light path is: the light ray incident from the object side at 35° passes through the first lens, the second lens, the third lens, the fourth lens and the fifth lens, is reflected on the image side of the fifth lens, then passes through the fifth lens, the fourth lens, the third lens and the second lens, is reflected on the image side of the first lens, then passes through the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the filter in sequence to reach the imaging surface. Figure 35 is a ghost simulation diagram of the lens module in Comparative Example 3, and Figure 36 is a ghost simulation diagram of the lens module in Embodiment 1.

[0132] Meanwhile, referring to FIGS. 31-36, compared with the ghost phenomenon of the lens module of Comparative Example 1, the ghost phenomenon of the lens module of Comparative Example 2, the ghost phenomenon of the lens module of Example 1, and the ghost phenomenon of the lens module of Example 2, the ghost phenomenon of the lens module of Example 2 is the weakest, and the imaging quality of the lens module of Example 2 is better than the imaging quality of the lens module of Comparative Example 2 and the imaging quality of the lens module of Example 1.

[0133] It can be understood that, in actual use, the light rays include light rays with different incident angles. Although the lens module of Example 1 has a part of the ghost phenomenon of the first lens L1 related to the image side at an incident angle of 35°, the ghost phenomenon of the lens module of Example 1 is weaker at other incident angles, and is weaker than the ghost phenomenon of the lens modules of Comparative Example 1 and Comparative Example 2. Therefore, it can be considered that the lens modules of Example 1 and Example 2 can weaken the ghost phenomenon and improve the imaging quality of the lens modules.

[0134] FIG. 37 is a ghost simulation diagram of the lens module of Comparative Example 1, and FIG. 38 is an enlarged diagram of the A4 region in FIG. 37. The light path is as follows: the light ray with an incident angle of 58° from the object side passes through the first lens, and then is reflected four times between the object side and the image side of the first lens, and then passes through the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the filter in sequence, and finally reaches the imaging surface. FIG. 39 is a ghost simulation diagram of the lens module of Comparative Example 2. FIG. 40 is a ghost simulation diagram of the lens module of Comparative Example 3. FIG. 41 is a ghost simulation diagram of the lens module of Example 1.

[0135] Meanwhile, referring to FIGS. 37-41, compared with the ghost phenomenon of the lens module of Comparative Example 1, the ghost phenomenon of the lens modules of Example 2 and Example 1 is significantly weakened after the filter is removed, the ghost phenomenon of Comparative Example 2 is stronger than that of Comparative Example 1, and the imaging quality of the lens modules of Example 2 and Example 1 is higher.

[0136] By comparing the ghost simulation diagrams of the lens modules of Comparative Example 1, Comparative Example 2, Example 1, and Example 2 at different angles, it can be found that the ghost phenomenon of the lens modules of Example 1 and Example 2 is weaker than that of Comparative Example 1, Comparative Example 2, and Example 1. The lens modules of Example 1 and Example 2 can weaken the ghost phenomenon of the lens modules in the related art, thereby improving the optical quality of the lens modules. The ghost phenomenon of Example 2 is weaker than that of Example 1, and the optical quality of the lens module of Example 2 is the best.

[0137] Table 2 is the test results of the reliability tests of Comparative Example 1, Comparative Example 2, Example 1, and Example 2.

[0138] In Table 2, the specific test environment is as follows: high temperature and high humidity: 85℃±2℃, 85%±5%RH, 480h; high temperature: 85℃±2℃, 600h; low temperature: -40℃±2℃, 600h; cold and hot impact: 120 cycles; 1 cycle: -40℃ (30 minutes), 85℃ (30 minutes); 600h.

[0139] Table 2

[0140] Referring to Table 2, in the reliability test, the lens module of the comparative example 1, the comparative example 2, the embodiment 1 and the embodiment 2 are in good appearance without film layer misting, film peeling, film cracking, film drumming and other problems under different test environments. This also shows that, after the deposition of the cut-off film on the glass lens and the spin coating of the absorption coating on any lens in the lens module of the embodiment of the application instead of the optical filter in the related art, the lens module of the embodiment of the application still has excellent reliability under different test environments.

[0141] In the above-mentioned lens module of the embodiment of the application, the presence of the specific wavelength absorption glass lens and the ultraviolet and infrared cut-off film can replace the optical filter in the related art, so that the thickness of the lens module of the embodiment of the application is smaller. When at least one lens of the plurality of lenses of the lens module is the specific wavelength absorption glass lens, the ultraviolet and infrared cut-off film is arranged on the flat surface of the specific wavelength absorption glass lens, the flat surface is relatively flat, so that the spectral drift of the lens center and the edge position can be smaller, and the specific wavelength absorption glass lens can improve the angle drift problem with respect to the incident angle, the lens module of the embodiment of the application can also weaken the ghosting phenomenon and improve the imaging quality of the lens module. When the plurality of lenses of the lens module includes at least one specific wavelength absorption glass lens and at least one second glass lens, the ultraviolet and infrared cut-off film is arranged on the flat surface of the specific wavelength absorption glass lens or on the flat surface of the second glass lens, the flat surface is relatively flat, so that the spectral drift of the lens center and the edge position can be smaller, the lens module of the embodiment of the application can improve the angle drift problem, the lens module of the embodiment of the application can also weaken the ghosting phenomenon and improve the imaging quality of the lens module.

[0142] Another embodiment of the application provides a terminal device including the lens module described in the above-mentioned embodiments. The same or corresponding parts of the terminal device are the same as or corresponding to the above-mentioned embodiments, and the corresponding descriptions of the above-mentioned embodiments will not be described in detail.

[0143] The terminal device can be a smart phone, a tablet computer, a notebook computer or a smart watch, etc.

[0144] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present application, and in practical applications, various changes can be made in form and details without departing from the spirit and scope of the present application. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A lens module, characterized in that: include: a plurality of lenses arranged sequentially from the object side to the image side, each of the plurality of lenses having an image-side surface facing the image side and an object-side surface facing the object side, and at least one of the object-side surface and the image-side surface comprises a flat surface, wherein an angle between a tangent line of a point on the flat surface within an optically effective diameter for imaging, excluding the center of the surface, and a tangent line at the center of the flat surface is 0°-20°; At least one lens among the plurality of lenses is a specific wavelength absorbing glass lens, and at least one of the flat surfaces is located on the specific wavelength absorbing glass lens; An ultraviolet infrared cut-off film is located on the flat surface of one of the specific wavelength absorbing glass lenses, and has an absorption effect on light in the ultraviolet and infrared bands.

2. The lens module according to claim 1, wherein: It also includes an absorption coating, which absorbs light of a specific wavelength, wherein the specific wavelength includes at least one of the ultraviolet band, the infrared band, and the near-infrared band. The absorption coating and the ultraviolet infrared cut-off film are both arranged on the flat surface of the specific wavelength absorbing glass lens, and the absorption coating is located between the ultraviolet infrared cut-off film and the flat surface.

3. The lens module according to claim 1, wherein: It also includes an absorption coating, which absorbs light of a specific wavelength, wherein the specific wavelength includes at least one of the ultraviolet band, the infrared band, and the near-infrared band; it also includes a plastic lens, the other flat surface is located on the plastic lens, the ultraviolet infrared cut-off film is arranged on the flat surface of the specific wavelength absorbing glass lens, and the absorption coating is arranged on the flat surface of the plastic lens.

4. The lens module according to claim 1, wherein: The specific wavelength absorbing glass lens is a blue glass lens or a dyed glass that has an absorbing effect on the infrared band.

5. A lens module, characterized in that: include: a plurality of lenses arranged sequentially from the object side to the image side, each of the plurality of lenses having an image-side surface facing the image side and an object-side surface facing the object side, and at least one of the object-side surface and the image-side surface comprises a flat surface, wherein an angle between a tangent line of a point on the flat surface within an optically effective diameter for imaging, excluding the center of the surface, and a tangent line at the center of the flat surface is 0°-20°; The plurality of lenses include at least one specific wavelength absorbing glass lens and at least one second glass lens; Ultraviolet infrared cut-off film, the ultraviolet infrared cut-off film is arranged on the flat surface of the specific wavelength absorbing glass lens The ultraviolet and infrared cutting film is arranged on the surface or on the flat surface of the second glass lens, and the ultraviolet and infrared cutting film has an absorption effect on light in the ultraviolet and infrared bands.

6. The lens module according to claim 5, characterized in that: It also includes an absorption coating, which absorbs light of a specific wavelength, wherein the specific wavelength includes at least one of an ultraviolet band, an infrared band, and a near-infrared band. The ultraviolet infrared cut-off film and the absorption coating are located on the same flat surface, and the absorption coating is located between the ultraviolet infrared cut-off film and the flat surface.

7. The lens module according to claim 5, wherein: It also includes an absorption coating, which absorbs light of a specific wavelength, wherein the specific wavelength includes at least one of the ultraviolet band, the infrared band, and the near-infrared band. One of the ultraviolet infrared cut-off film and the absorption coating is arranged on the flat surface of the specific wavelength absorbing glass lens, and the other is arranged on the flat surface of the second glass lens.

8. The lens module according to claim 5, wherein: It also includes an absorption coating that absorbs light of a specific wavelength, wherein the specific wavelength includes at least one of an ultraviolet band, an infrared band, and a near-infrared band. It also includes a plastic lens, wherein one of the absorption coatings is arranged on the flat surface of the plastic lens.

9. The lens module according to claim 5, wherein: The specific wavelength absorbing glass lens is a blue glass lens or a dyed glass that has an absorbing effect on the infrared band.

10. A terminal device, characterized in that: Comprising the lens module as described in claims 1-9.

Images