CN115508972A - Optical lens and camera module - Google Patents

Abstract

The application discloses optical lens and module of making a video recording, this optical lens includes the lens cone and sets up the lens group in the lens cone, the lens group includes first lens and the second lens that set gradually from the object side to the picture side, first lens and second lens are the glass lens, first lens including be used for the first optics district of formation of image with around the first structural area outside first optics district, the second lens is including the second optics district that is used for the formation of image and around the second structural area outside second optics district, first structural area and second structural area are mutually in the limit. The first lens and the second lens are mutually matched, so that the eccentricity between the first lens and the second lens is favorably reduced, and the imaging quality of the optical lens is improved; the first lens and the second lens are mutually matched, so that the distance between the first lens and the second lens is favorably reduced, and the overall height of the optical lens is favorably reduced.

Description

Optical lens and camera module

Technical Field

The application relates to the technical field of lenses, in particular to an optical lens and a camera module.

Background

With the improvement of living standard, consumers have higher and higher requirements for the camera function of terminal devices such as mobile phones and tablet phones, and not only require that the aberration such as astigmatism, curvature of field, distortion and the like of the lens is low, but also require that the specification parameters such as the field angle, the aperture, the light transmittance and the like of the lens are required, and while the lens parameters are improved and the lens imaging is improved, the lens height (referred to as total optical length TTL) is increased, but for the terminal devices such as mobile phones, the device thickness is also an important parameter.

How to control the height of the lens while improving the lens parameters and improving the lens imaging is an important subject of research and development of various manufacturers at present, wherein, increasing the refractive index of the lens and adopting a glass lens is one of the feasible schemes at present. The glass lens is manufactured by a molding technology at present, which mainly utilizes the characteristic that viscosity of glass is reduced along with the rise of temperature, a glass preform which is shaped preliminarily is placed in a mold which is formed by precision machining, the temperature is raised to be between the glass conversion temperature and the softening point under a proper environment atmosphere, the glass is deformed by applying pressure on the surface of a mold core, the shape of the mold core is converted, the pressure is removed after cooling, the mold is separated, and a finished product is taken out. However, the molding process has a large defect, the surface accuracy of the glass lens is difficult to control, so that the lens has large eccentricity, the mold is easy to wear, the mold needs to be maintained for many times, and the cost is high.

Disclosure of Invention

An object of this application is to provide an optical lens and have this optical lens's module of making a video recording, be favorable to improving the formation of image quality.

Another objective of the present application is to provide an optical lens and a camera module having the same, which are beneficial to reducing the height of the lens.

In order to achieve the above object, the present application provides an optical lens, including a lens barrel and a lens group disposed in the lens barrel, the lens group includes a first lens and a second lens sequentially disposed from an object side to an image side, the first lens and the second lens are glass lenses, the first lens includes a first optical area for imaging and surrounds a first structural area outside the first optical area, the second lens includes a second optical area for imaging and surrounds a second structural area outside the second optical area, the first structural area and the second structural area are mutually engaged.

Further, the refractive indices of the first lens and the second lens are not equal.

Further, the refractive index of the first lens and/or the second lens is larger than 1.6, and the abbe number of the first lens and/or the second lens is larger than 56.

Further, the refractive index of the first lens and/or the second lens is greater than 1.8.

Further, a distance between optical axes of the first lens and the second lens is less than 3 μm.

Further, the glass lens is obtained by cutting a wafer, the wafer comprises a plurality of optical areas arranged in an array, the optical areas are mutually spaced, the area of the wafer except for the optical areas is a non-optical area, and the wafer is suitable for cutting in the non-optical area to separate the optical areas, so that a plurality of glass lenses are obtained.

Further, an adhesive is disposed between the first structural area and the second structural area to bond the first lens and the second lens.

Further, the optical axis of the first lens is not coincident with the central axis of the first structural region, and/or the optical axis of the second lens is not coincident with the central axis of the second structural region.

Further, a gap exists between the peripheral side surface of the first lens and/or the second lens and the lens barrel, and the width of the gap is 10-50 μm.

Furthermore, a matched lens group consisting of the first lens and the second lens is fixedly connected with the lens barrel through an adhesive, and the first structural area and/or the second structural area are/is adhered with the lens barrel.

Further, only the peripheral side surface of the first structure region is bonded to the lens barrel.

Further, the peripheral side surface of the second structure area is bonded with the lens barrel.

Further, a first rough surface is arranged on the peripheral side surface and/or the object side surface of the first structure area, the roughness Ra of the first rough surface is 0.006-0.015 [ mu ] m, the roughness of the first rough surface is larger than that of the first optical area, and an adhesive is arranged between the first rough surface and the lens barrel to adhere the first lens and the lens barrel; and/or the peripheral side surface of the second structure area is provided with a second rough surface, the roughness Ra of the second rough surface is 0.006-0.015 mu m, the roughness of the second rough surface is greater than that of the second optical area, and an adhesive is arranged between the second rough surface and the lens barrel to bond the second lens and the lens barrel.

Further, the ratio of the coefficient of thermal expansion of the lens barrel to the coefficient of thermal expansion of the glass lens is less than or equal to 300%.

Furthermore, the material of the lens cone is metal, or the material of the lens cone is plastic added with mineral fiber or glass fiber, or the material of the lens cone is polycarbonate added with carbon fiber.

The application still provides a module of making a video recording, including aforementioned optical lens, supporter and sensitization subassembly, optical lens passes through the supporter keeps on sensitization subassembly advances light path.

Compared with the prior art, the beneficial effect of this application lies in: the first lens and the second lens are made of glass lenses, and the main advantages are that the refractive index of the lenses and the light transmittance of the lenses are improved; the first lens and the second lens are mutually matched, so that the eccentricity between the first lens and the second lens is reduced, and the imaging quality of the optical lens is improved; (ii) a The refractive index of the first lens and the refractive index of the second lens are increased, so that the total optical length (TTL) of the optical lens can be reduced, and the overall height of the optical lens and the camera module can be reduced.

Other technical features and advantages of the present application will be described in detail in the detailed description of the embodiments.

Drawings

FIG. 1 is a schematic view of one embodiment of a wafer of the present application;

fig. 2 shows a pressing mold of WLG wafer level glass lens technology and a flat glass disposed in the pressing mold;

FIG. 3 shows a press module pressing a first surface and a second surface of a flat glass into a predetermined shape;

FIG. 4 is a schematic view of a first embodiment of an optical lens of the present application;

FIG. 5 is a schematic view of a first lens and a second lens of the present application engaged with each other;

FIG. 6 is a schematic view of one embodiment of a first lens of the present application;

FIG. 7 is a schematic view of a second embodiment of an optical lens of the present application;

fig. 8 is a schematic view of a third embodiment of an optical lens of the present application;

fig. 9 is a schematic view of a fourth embodiment of an optical lens of the present application;

FIG. 10 is a schematic view of an embodiment of a camera module of the present application;

in the figure:

100. split type camera lens

1. A lens barrel;

2. a lens group; 21. a first lens; 211. a first optical zone; 212. a first structural region; 22. a second lens; 221. a second optical zone; 222. a second structural region;

3. a wafer; 31. an optical zone; 32. a non-optical zone;

4. a flat glass; 41. a first surface; 42. a second surface;

5. pressing a mould; 51. an upper die; 52. a lower die;

200. a support member; 300. a photosensitive assembly; 301. a circuit board; 302. a photosensitive chip; 303. a support; 304. a filter element.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.

It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 4, the present application provides an optical lens 100, including a lens barrel 1 and a lens group 2 disposed in the lens barrel 1, where the lens group 2 includes a first lens 21 and a second lens 22 disposed in order from an object side to an image side, and the first lens 21 and the second lens 22 are glass lenses, as shown in fig. 5, the first lens 21 includes a first optical area 211 for imaging and a first structural area 212 surrounding the first optical area 211, and the second lens 22 includes a second optical area 221 for imaging and a second structural area 222 surrounding the second optical area 221, and the first structural area 212 and the second structural area 222 are mutually engaged to connect the first lens 21 and the second lens 22, so that a distance between an optical axis of the first optical area 211 of the first lens 21 and an optical axis of the second optical area 221 of the second lens 22 is reduced, thereby improving assembly accuracy between the first lens 21 and the second lens 22.

In the application, the first lens 21 and the second lens 22 are glass lenses, and the main advantages are that the refractive index of the lenses and the light transmittance of the lenses are improved; the first lens 21 and the second lens 22 are mutually engaged, which is beneficial to reducing the eccentricity between the two, thereby improving the imaging quality of the optical lens 100; the increase of the refractive index of the first lens 21 and the second lens 22 can reduce the total optical length (TTL) of the optical lens 100, which is beneficial to reducing the overall height of the optical lens 100 and the camera module.

The refractive indexes of the first lens 21 and the second lens 22 may be the same or different. Preferably, the refractive indexes of the first lens 21 and the second lens 22 are not equal, so that the degree of freedom in optical design of the optical lens 100 is improved.

In some embodiments, the refractive indexes of the first lens 21 and the second lens 22 are greater than 1.6, and the abbe numbers of the first lens 21 and the second lens 22 are greater than 56, so that the total optical length of the lens can be reduced by about 20%, and the maximum total optical length can be reduced by 1-2 mm. Further preferably, the refractive index of the first lens 21 and/or the second lens 22 is greater than 1.8.

In some embodiments, the glass lens described herein is obtained by cutting a wafer 3, as shown in fig. 1, the wafer 3 includes a plurality of optical zones 31 arranged in an array, each optical zone 31 is spaced apart from another optical zone 31, an area of the wafer 3 other than the optical zones 31 is a non-optical zone 32, and the wafer 3 is adapted to perform cutting in the non-optical zone 32 to separate the optical zones 31, so as to obtain a plurality of wafer-level glass lenses. The wafer-level glass lens with higher surface precision and lower cost is adopted to replace a molded glass lens, so that the production cost of the lens is reduced, and the imaging quality of the lens is improved.

Because the first lens 21 and the second lens 22 both adopt wafer-level glass lenses with high surface type precision, the distance between the optical axes after the first lens 21 and the second lens 22 are combined is less than 3 μm, or the eccentricity between the first lens 21 and the second lens 22 is less than 3 μm. Further preferably, the decentering of the first lens 21 and the second lens 22 is less than 2 μm.

The wafer 3 can be manufactured by a WLG wafer level glass lens technology, the wafer 3 is manufactured by the WLG wafer level glass lens technology, a glass lens with high surface precision can be obtained, and the process has small loss on a mold. A method of manufacturing a wafer level glass lens by WLG wafer level glass lens technology is exemplarily described below, comprising the steps of:

s1, providing a plane glass 4 and a pressing mold 5, wherein the plane glass 4 is provided with a first surface 41 and a second surface 42, and the pressing mold 5 comprises an upper mold 51 and a lower mold 52, as shown in FIG. 2;

s2, pressing the first surface 41 and the second surface 42 of the plane glass 4 into a preset shape by using a pressing die 5, as shown in figure 3, obtaining a wafer 3 with a plurality of optical areas 31;

and S3, cutting the wafer 3 to obtain a plurality of wafer-level glass lenses.

The wafer level glass lens manufactured by the WLG wafer level glass lens technology has high surface type precision, and because the WLG wafer level glass lens can be produced in batch, the production efficiency of the lens is higher, and the loss of the process to the pressing mould 5 is smaller.

The step S2 and the step S3 can also comprise a film coating step: the first surface 41 and/or the second surface 42 are coated with a film, which may be one or more of an antireflection film, a light filter film, a protective film, and the like. Due to the characteristics of the WLG wafer level glass lens technology, the coating process of the wafer level glass lens can be simplified, and the WLG wafer level glass lens can be directly realized on the wafer 3 in batch. In other words, the wafer level glass lens may have one or more of an anti-reflection film, a filter film, a protection film, and the like.

The step S2 and the step S3 can also comprise a black plating step: and (3) plating black on a non-optical area 32 of the wafer 3 except for the optical area 31 to endow the wafer-level glass lens with the function of reducing stray light. Similarly, due to the characteristics of the WLG wafer-level glass lens technology, the blackening process of the wafer-level glass lens can also be simplified, and can be directly realized on the wafer 3 in batch. In other words, the wafer-level glass lens has a black coating on the non-optical area (or structural area).

The method for cutting the wafer 3 in step S3 may be, but is not limited to, sawing, laser cutting, laser grinding, water jet cutting, milling, micro machining, micro-slicing, punching and cutting, etc. The shape of the wafer-level glass lens obtained after the wafer 3 is cut may be a square or a circle, which is not limited in this application, and preferably, the shape of the wafer-level glass lens obtained after the wafer 3 is cut is a circle to adapt to the existing lens barrel structure.

The first lens 21 and the second lens 22 can be engaged after the first lens 21 and the second lens 22 are obtained by cutting the corresponding wafer 3. For example, in the example of the method for manufacturing the wafer-level glass lens by the WLG wafer-level glass lens technology in the present application, the step S2 and the step S3 may include the following steps: obtaining two wafers 3, wherein the optical areas 31 of the two wafers 3 can be the same or different in shape, and the non-optical areas 32 of the two wafers 3 are suitable for fitting with each other in shape; two wafers 3 are stacked such that the non-optical areas 32 of the two wafers 3 fit each other. After the two wafers 3 are engaged, a dicing step is performed to obtain a plurality of first lenses 21 and second lenses 22 engaged with each other. Further, before stacking the two wafers 3, an adhesive layer may be provided between the non-optical regions 32 of the two wafers 3, and the two wafers 3 may be further fixed by the adhesive layer.

In some embodiments, an adhesive is disposed between the first structured area 212 of the first lens 21 and the second structured area 222 of the second lens 22 to bond the first lens 21 to the second lens 22.

In some embodiments, as shown in fig. 6, the optical axis of first optic 21 (solid line in fig. 6) is not coincident with the central axis of its first structural zone 212 (dashed line in fig. 6), and/or the optical axis of second optic 22 is not coincident with the central axis of its second structural zone 222. This is mainly due to the fact that the wafer level glass lens is obtained by cutting the wafer 3, and the profile accuracy is affected by the cutting accuracy, so that the concentricity between the center of the optical area of the lens and the center of the structural area of the lens is poor.

In conventional lens assembly, the optical axis of the lens and the central axis of its structural zone can be well coincident, since the positioning of the lens can be accomplished by the edge shape of the lens structural zone. However, in the present application, since the optical axis of the first lens 21 and/or the second lens 22 is not coincident with the central axis of the structural region, and the edge shape of the first lens 21 of different batches or the second lens 22 of different batches may be different, it is difficult to position the lenses by the edge shape of the lenses.

In order to enable the lens barrel 1 to be adapted to most of the first lens 21 and the second lens 22, the present application suitably enlarges the inner diameter of the part of the lens barrel 1 where the first lens 21 and the second lens 22 are installed, which causes a gap to exist between the peripheral side of the first lens 21 and/or the second lens 22 and the lens barrel 1. In some preferred embodiments, the width of the gap between the peripheral side surface of the first lens 21 and/or the second lens 22 and the lens barrel 1 is 10 μm to 50 μm. The gap between the peripheral side surface of the first lens 21 and/or the second lens 22 and the lens barrel 1 may be filled with an adhesive. It should be noted that the peripheral side surface of the lens is a surface which connects the object side surface and the image side surface of the lens structure area and is annular around the lens.

In some embodiments, the lens barrel 1 and the mating lens group formed by the first lens 21 and the second lens 22 are fixed by an adhesive, so as to ensure that the positions of the first lens 21 and the second lens 22 and the lens barrel 1 are fixed accurately, and thus the alignment degree of the optical axis between the mating lens group and other lenses in the lens barrel 1 can be improved.

In some embodiments, the first structure region 212 of the first lens 21 is adhered to the lens barrel 1, so as to connect the matched lens group to the lens barrel 1. In the embodiment shown in fig. 7, both the peripheral side surface and the object side surface of the first structure region 212 are bonded to the lens barrel 1. In the embodiment shown in fig. 8, only the peripheral side of the first structure region 212 is bonded to the lens barrel 1. Considering that providing glue between the object side surface of the first structure region 212 and the lens barrel 1 may cause the first lens 21 to tilt in the lens barrel 1, it is preferable that no glue is provided between the object side surface of the first structure region 212 and the lens barrel 1.

In other embodiments, the second structure area 222 of the second lens 22 is adhered to the lens barrel 1, so as to connect the matched lens group to the lens barrel 1. Specifically, the peripheral side surface of the second structure region 222 is bonded to the lens barrel 1, as shown in fig. 9.

It is worth mentioning that the bonding of the glass lens and the plastic lens barrel may have the following problems: since the Coefficient of Thermal Expansion (CTE) of the glass material is greatly different from that of the plastic material, even if a material with a relatively low CTE is used as the lens barrel material, the CTE of the glass lens is still larger than that of the glass lens, which causes the glass lens to easily fall off at high temperature or during temperature change.

In order to solve the problem that the glass lens is easy to fall off at high temperature or during temperature change, the roughness of the glass lens can be increased to improve the bonding force between the lens and the lens cone 1. In some embodiments, the first structure region 212 has a first rough surface on the peripheral side and/or the object side, the roughness Ra of the first rough surface is 0.006 μm to 0.015 μm, and the roughness of the first rough surface is greater than that of the first optical region 211, and the first lens 21 is bonded to the lens barrel 1 by providing glue on the first rough surface. In other embodiments, the second structure region 222 has a second rough surface on the peripheral side surface, the roughness Ra of the second rough surface is 0.006 μm to 0.015 μm, and the roughness of the second rough surface is greater than the roughness of the second optical region 221, and the second lens 22 is bonded to the lens barrel 1 by disposing a glue on the second rough surface.

In addition, the adhesion of the glass lens to the plastic lens barrel may have the following problems: because the Coefficient of Thermal Expansion (CTE) of the glass material is greatly different from that of the plastic material, the deformation amount of the glass lens is much smaller than that of the plastic lens barrel under the high-temperature and high-pressure environment, which causes the relative position of the glass lens and the plastic lens barrel to shift, and even the glass lens is cracked in the process of resisting the temperature change.

In order to reduce the possibility of displacement or breakage of the glass lens, the lens barrel 1 is made of a material having a thermal expansion coefficient close to that of the glass lens. In some embodiments, the ratio of the thermal expansion coefficient of the lens barrel 1 to the thermal expansion coefficient of the glass lens is less than or equal to 300%, the material of the lens barrel 1 may be a metal material, or the material of the lens barrel 1 is a plastic with mineral fiber or glass fiber added.

In one embodiment, the lens barrel 1 is made of polycarbonate with carbon fibers added, wherein the mass fraction of the carbon fibers is 30%, the material has a thermal expansion coefficient of 38-42, and the material is basically connected with the carbon fibersThe material has thermal expansion coefficient close to that of glass, and has good demolding performance and fire retardant performance, and the density is 1.3-1.5 g/cm ³ The shrinkage rate is 0.25-0.45%, the bending strength is 80-100 MPa, the bending modulus is 4800-5200 MPa, the thermal deformation temperature is 120-140 ℃, and the high flexibility and excellent collision performance are realized.

In some embodiments, the lens group 2 further includes at least one lens disposed on the image side of the second lens 22, and the lenses may be glass lenses or not, and when the lenses are glass lenses, particularly glass lenses manufactured by WLG wafer level glass lens technology, the lenses are adapted to reduce decentration between the lenses by matching the structural regions with the second structural region 222 of the second lens 22.

In some embodiments, the first lens element 21 is the first lens element on the object side of the lens group 2.

In some embodiments, the first structure area 212 of the first lens 21 and/or the second structure area 222 of the second lens 22 have a black coating thereon to reduce flare.

The present application further provides a camera module, as shown in fig. 10, which includes the aforementioned optical lens 100, a support 200 and a photosensitive assembly 300, wherein the optical lens 100 is held on a light path of the photosensitive assembly 300 through the support 200. The supporter 200 may be a lens holder for supporting only the optical lens 100, or may be a motor capable of driving the optical lens 100 to perform auto-focusing, zooming, or anti-shake. The photosensitive assembly 300 includes a circuit board assembly and a filter assembly, the circuit board assembly includes a circuit board 301, a photosensitive chip 302 electrically connected to the circuit board 301, and electronic components such as capacitors and resistors. The filter assembly includes a bracket 303 and a filter element 304 fixed on the bracket 303, the filter element 304 is held on the light path of the photosensitive chip 302 through the bracket 303, the bracket 303 is fixed on the circuit board 301, and the photosensitive assembly 300 is fixed with the support member 200 through the bracket 303.

The foregoing has described the principles, principal features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (16)

1. An optical lens barrel is provided, which includes a lens barrel and a lens group disposed in the lens barrel, the lens group includes a first lens and a second lens disposed sequentially from an object side to an image side, the first lens and the second lens are both glass lenses, the first lens includes a first optical area for imaging and a first structural area surrounding the first optical area, the second lens includes a second optical area for imaging and a second structural area surrounding the second optical area, and the first structural area and the second structural area are engaged with each other.

2. An optical lens as claimed in claim 1, characterized in that the refractive indices of the first and second mirror plates are not equal.

3. An optical lens as claimed in claim 1, characterized in that the refractive index of the first and/or second optic is greater than 1.6 and the abbe number of the first and/or second optic is greater than 56.

4. An optical lens as claimed in claim 3, characterized in that the refractive index of the first and/or second mirror is greater than 1.8.

5. An optical lens as claimed in claim 1, characterized in that the distance between the optical axes of the first and second lenses is less than 3 μm.

6. An optical lens according to any one of claims 1 to 5, wherein the glass lens is obtained by cutting a wafer, the wafer including a plurality of optical zones arranged in an array, the optical zones being spaced apart from each other, the wafer being adapted to be cut in the non-optical zone to separate the optical zones, thereby obtaining a plurality of the glass lenses.

7. An optical lens according to any one of claims 1 to 5, wherein an adhesive is provided between the first structure region and the second structure region to bond the first lens and the second lens.

8. An optical lens according to any one of claims 1 to 5, characterized in that the optical axis of the first lens is not coincident with the central axis of the first structure region and/or the optical axis of the second lens is not coincident with the central axis of the second structure region.

9. The optical lens according to claim 8, wherein a gap exists between a peripheral side surface of the first lens and/or the second lens and the lens barrel, and a width of the gap is 10 μm to 50 μm.

10. The optical lens of claim 8, wherein the lens barrel is fixed to the first lens element and the second lens element by an adhesive, and the first structure area and/or the second structure area is bonded to the lens barrel.

11. An optical lens of claim 10, wherein only a peripheral side of the first structured area is bonded to the barrel.

12. An optical lens according to claim 10, wherein a peripheral side surface of the second structure region is bonded to the lens barrel.

13. An optical lens according to claim 10, wherein the first structure region has a first rough surface on the peripheral side surface and/or the object side surface, the roughness Ra of the first rough surface is 0.006 μm to 0.015 μm, the roughness of the first rough surface is greater than that of the first optical region, and an adhesive is provided between the first rough surface and the lens barrel to bond the first lens and the lens barrel;

and/or the peripheral side surface of the second structure area is provided with a second rough surface, the roughness Ra of the second rough surface is 0.006-0.015 mu m, the roughness of the second rough surface is greater than that of the second optical area, and an adhesive is arranged between the second rough surface and the lens barrel to bond the second lens and the lens barrel.

14. The optical lens of claim 10, wherein a ratio of a coefficient of thermal expansion of the lens barrel to a coefficient of thermal expansion of the glass lens is 300% or less.

15. An optical lens barrel according to claim 14, wherein the lens barrel is made of metal, or is made of plastic with mineral fiber or glass fiber added, or is made of polycarbonate with carbon fiber added.

16. A camera module, comprising the optical lens according to any one of claims 1 to 15, a support member, and a photosensitive member, wherein the optical lens is held on a light path of the photosensitive member by the support member.

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