Lens assembly

Abstract

The lens assembly includes: a first lens barrel; a second lens barrel disposed in front of the first lens barrel while surrounding at least a portion of the first lens barrel; and a first lens disposed in front of the second lens barrel in contact with a portion of the second lens barrel, in which a thermal conductivity coefficient of the second lens barrel is higher than a thermal conductivity coefficient of the first lens barrel.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0140732 filed on October 19, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The present disclosure relates to a lens assembly applied to a camera module. Background Art

[0004] Recently, vehicles such as cars are equipped with multiple cameras, including not only rear view cameras but also surround view monitoring (SVM) cameras, advanced driver assistance system (ADAS) cameras, and other types of cameras. In particular, the number of cameras mounted on the exterior of vehicles is increasing.

[0005] Vehicles can operate in various environments and can operate in environments where temperature and humidity change rapidly. In particular, when a vehicle encounters a low temperature environment in a high temperature and high humidity environment, condensation may occur on the surface of components mounted on the vehicle.

[0006] In the case of a camera module mounted on the outside of a vehicle, condensation is likely to occur inside the camera module due to rapid temperature changes. In particular, in the case of a lens disposed at the outermost (forwardmost) side of the camera module, the object side of the lens is directly exposed to the external environment, and thus condensation is likely to occur on the image side of the lens disposed inside the camera module. Since the performance of the camera module may be degraded due to condensation, a lens assembly capable of preventing condensation is required. Summary of the invention

[0007] The purpose of providing this summary is to introduce a selection of concepts in a concise form, and these concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0008] In a general aspect, a lens assembly includes: a first lens barrel; a second lens barrel disposed in front of the first lens barrel and surrounding at least a portion of the first lens barrel; and a first lens disposed in front of the second lens barrel in contact with a portion of the second lens barrel, wherein the thermal conductivity of the second lens barrel is higher than the thermal conductivity of the first lens barrel.

[0009] The first lens barrel may be made of synthetic resin, and the second lens barrel may be made of metal.

[0010] The second lens barrel may include a gap maintaining portion and a body portion, the first lens may be disposed in front of the gap maintaining portion, and a portion of the first lens barrel may be disposed inside the body portion.

[0011] The gap retaining portion may include a hole extending in the optical axis direction and forming an inner peripheral surface of the gap retaining portion, and a plurality of grooves may be formed in the inner peripheral surface of the gap retaining portion and may extend in a circumferential direction of the inner peripheral surface.

[0012] The gap retaining portion may include a hole extending in the optical axis direction and forming an inner peripheral surface of the gap retaining portion, and a plurality of grooves may be formed in the inner peripheral surface of the gap retaining portion and may extend in the optical axis direction.

[0013] The plurality of grooves may form a waveform shape along an inner peripheral surface of the gap retaining portion when viewed from the front of the second lens barrel.

[0014] The plurality of grooves may form a sawtooth shape along an inner peripheral surface of the gap maintaining portion when viewed from the front of the second lens barrel.

[0015] The thermal conductivity of the second lens barrel may be higher than the thermal conductivity of the first lens.

[0016] The lens assembly may further include a cover supporting the first lens, and the cover may be made of the same material as that of the second lens barrel.

[0017] A seating groove may be formed in a front surface of the second lens barrel in a circumferential direction of the second lens barrel, the seating groove may overlap with the first lens in an optical axis direction, and the lens assembly may further include a sealing member disposed in the seating groove.

[0018] In another general aspect, a lens assembly includes: a first lens barrel; a second lens barrel disposed in front of the first lens barrel and surrounding at least a portion of the first lens barrel; and a first lens disposed in front of the second lens barrel, wherein the second lens barrel includes a gap retaining portion that contacts the first lens and separates the first lens from the first lens barrel, and a thermal conductivity coefficient of the gap retaining portion is higher than a thermal conductivity coefficient of the first lens.

[0019] A plurality of grooves that may be recessed in a direction perpendicular to the optical axis direction may be formed in the surface of the gap retaining portion.

[0020] The gap retaining portion may include a hole extending in the optical axis direction and forming an inner peripheral surface of the gap retaining portion, and a plurality of grooves may be formed along the inner peripheral surface of the gap retaining portion.

[0021] A plurality of grooves may be arranged side by side in the optical axis direction.

[0022] The gap holding portion may include a hole extending in the optical axis direction and forming an inner peripheral surface of the gap holding portion, a longitudinal direction of the plurality of grooves may be parallel to the optical axis direction, and the plurality of grooves may be formed along the inner peripheral surface of the gap holding portion.

[0023] Other features and aspects will be apparent from the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of a lens assembly according to an embodiment of the present disclosure.

[0025] Figure 2 yes Figure 1 A cross-sectional view of a lens assembly.

[0026] Figure 3 yes Figure 2 A cross-sectional stereoscopic view of a second lens barrel.

[0027] Figure 4 yes Figure 3 sectional view of the second lens barrel.

[0028] Figure 5 is a cross-sectional perspective view of a second lens barrel according to another embodiment of the present disclosure.

[0029] Figure 6 yes Figure 5 A plan view of the second lens barrel.

[0030] Figure 7 is a cross-sectional perspective view of a second lens barrel according to another embodiment of the present disclosure.

[0031] Figure 8 yes Figure 7 A plan view of the second lens barrel.

[0032] Fig. 9 is a cross-sectional view of a lens assembly according to another embodiment of the present disclosure.

[0033] Fig.10 is a cross-sectional view of a lens assembly according to another embodiment of the present disclosure.

[0034] Fig.11 is a graph for illustrating the thermal conductivity relationship between the first lens and the gap maintaining portion. DETAILED DESCRIPTION

[0035] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the method, device and / or system described herein. However, various changes, modifications and equivalents of the method, device and / or system described herein will be apparent after understanding the disclosure of the application. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, except for the order of operations that must occur in a specific sequence, but can be changed, which will be apparent after understanding the disclosure of the application. In addition, for greater clarity and brevity, the description of features known in the art may be omitted.

[0036] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0037] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0038] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0039] Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or portion from another member, component, region, layer or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0040] Spatially relative terms such as "above", "above", "below", and "below" may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "above" another element relative to the other element will be "below" or "below" the other element relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0041] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the terms "a", "an" and "the" are intended to include plural forms as well. The terms "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0042] For the purpose of explanation, the object side may be referred to as the front, and the image side may be referred to as the rear. In addition, the direction away from the optical axis in the direction perpendicular to the optical axis may be referred to as the outside, and the direction toward the optical axis in the direction perpendicular to the optical axis may be referred to as the inside.

[0043] Figure 1 is a perspective view of a lens assembly according to an embodiment of the present disclosure, and Figure 2 yes Figure 1 A cross-sectional view of a lens assembly.

[0044] refer to Figure 1 and Figure 2 , a coupling structure of a lens assembly according to an embodiment of the present disclosure will be described.

[0045] The lens assembly may include a lens barrel 10 , a first lens 20 , a lens group 30 , and a cover 40 .

[0046] The lens barrel 10 may have a cylindrical shape. The radius of the lens barrel 10 may vary in the optical axis direction. That is, the lens barrel 10 may not have a constant radius and may have a varying shape in the optical axis direction.

[0047] The lens barrel 10 may include a first lens barrel 110 and a second lens barrel 120. Figure 2, compared with the second lens barrel 120, the first lens barrel 110 may be disposed at the rear.

[0048] The first lens barrel 110 may be disposed closer to the image side than the second lens barrel 120. The radius of the first lens barrel 110 may narrow from front to back. The first lens barrel 110 may include a first body 111 and a second body 112. The first body 111 may be disposed relatively forward relative to the second body 112. The radius of the first body 111 may be greater than the radius of the second body 112.

[0049] The first lens barrel 110 may include a through hole 113. The through hole 113 may be a hole that penetrates the first lens barrel 110 along the optical axis. The lens group 30 may be disposed in the through hole 113 of the first lens barrel 110. The spacer 35 may be disposed in the through hole 113 of the first lens barrel 110. The number of lenses of the lens group 30 disposed in the through hole 113 of the first lens barrel 110 and the number of spacers 35 may vary.

[0050] The second lens barrel 120 may be disposed in front of the first lens barrel 110 while surrounding at least a portion of the first lens barrel 110. The second lens barrel 120 may include a gap retaining portion 121 and a main body portion 122. When viewed from the front of the second lens barrel 120, the gap retaining portion 121 may be coupled to the main body portion 122. The gap retaining portion 121 may be formed integrally with the main body portion 122. The gap retaining portion 121 may be formed to protrude from the inner surface of the main body portion 122 toward the optical axis. Therefore, the inner diameter of the gap retaining portion 121 may be smaller than the inner diameter of the main body portion 122.

[0051] The first lens 20 may be disposed on one side of the gap holding portion 121, and the first lens barrel 110 may be disposed on the other side of the gap holding portion 121. In this case, a portion of the lens group 30 disposed in the first lens barrel 110 may contact the other side of the gap holding portion 121.

[0052] The first lens 20 may be placed at the front of the lens assembly. The first lens 20 may be disposed on one side of the second lens barrel 120. The first lens 20 may be disposed to contact one side surface of the gap holding portion 121 of the second lens barrel 120. A cross section of the first lens 20 parallel to the optical axis may have a shape as shown in FIG. Figure 2 The image-side surface of the first lens 20 may be spaced apart from the object-side surface of the frontmost lens among the lenses of the lens group 30 disposed in the first lens barrel 110 .

[0053] The cover 40 may support the first lens 20 so that the first lens 20 is fixed to the second lens barrel 120. The cover 40 may be disposed along the outer peripheral surface of the first lens 20. A portion of the cover 40 may overlap a portion of the first lens 20 in a direction perpendicular to the optical axis. Another portion of the cover 40 may overlap a portion of the second lens barrel 120 in a direction perpendicular to the optical axis. The cover 40 and the second lens barrel 120 may be made of the same material.

[0054] Figure 3 yes Figure 2 A cross-sectional perspective view of the second lens barrel, Figure 4 yes Figure 3 sectional view of the second lens barrel.

[0055] refer to Figure 3 and Figure 4 , will describe Figure 2 The structure of the second lens barrel 120 is shown in FIG.

[0056] As described above, the second lens barrel 120 may include a main body portion 122 and a gap retaining portion 121. The gap retaining portion 121 may include a hole 1211. The gap retaining portion 121 may have a thickness. When viewed from the front of the second lens barrel 120, the hole 1211 of the gap retaining portion 121 may be circular. The gap retaining portion 121 may have a thickness in the optical axis direction. The width of the inner peripheral surface 1212 of the gap retaining portion 121 in the optical axis direction may be equal to the thickness of the gap retaining portion 121.

[0057] A groove 1213 may be formed in the inner circumferential surface 1212 of the gap holding portion 121. The groove 1213 may be a groove formed to be recessed from the inner circumferential surface 1212 of the gap holding portion 121 toward the outer side of the second lens barrel 120. The groove 1213 may be formed to extend along the inner circumferential surface 1212 of the gap holding portion 121. For example, the groove 1213 may be formed on the inner circumferential surface 1212 of the gap holding portion 121 in the circumferential direction. Figure 3 and Figure 4 As shown in , a plurality of grooves 1213 may be formed. The plurality of grooves 1213 may be arranged side by side in the optical axis direction.

[0058] The surface area of ​​the inner circumferential surface 1212 of the gap retaining portion 121 may be increased by the groove 1213 of the inner circumferential surface 1212 of the gap retaining portion 121. Specifically, when the groove 1213 is formed in the inner circumferential surface 1212 of the gap retaining portion 121, the surface area of ​​the inner circumferential surface 1212 of the gap retaining portion 121 may be increased compared to when the gap retaining portion 121 does not include the groove 1213.

[0059] Figure 5is a cross-sectional perspective view of a second lens barrel according to another embodiment of the present disclosure, and Figure 6 yes Figure 5 A plan view of the second lens barrel.

[0060] refer to Figure 5 and Figure 6 , a second lens barrel 120 according to another embodiment of the present disclosure will be described.

[0061] As described above, the second lens barrel 120 may include a main body portion 122 and a gap retaining portion 121. The gap retaining portion 121 may include a hole 1211. The gap retaining portion 121 may have a thickness. When viewed from the front of the second lens barrel 120, the hole 1211 of the gap retaining portion 121 may be circular. The gap retaining portion 121 may have a thickness in the optical axis direction. The width of the inner peripheral surface 1212 of the gap retaining portion 121 in the optical axis direction may be equal to the thickness of the gap retaining portion 121.

[0062] A groove 1223 may be formed in the inner circumferential surface 1212 of the gap holding portion 121. The groove 1223 may be a groove formed to be recessed from the inner circumferential surface 1212 of the gap holding portion 121 toward the outside of the second lens barrel 120. The groove 1223 may be formed in the inner circumferential surface 1212 of the gap holding portion 121 in a direction parallel to the optical axis. Figure 5 and Figure 6 As shown in , a plurality of grooves 1223 may be formed. A plurality of grooves 1223 may be provided in the circumferential direction of the second lens barrel 120. When viewed from the front of the second lens barrel 120, the inner circumferential surface 1212 of the gap retaining portion 121 may have a waveform shape. That is, when viewed from the front of the second lens barrel 120, each groove 1223 is a groove including a curved shape, and a curved protrusion 1224 may be provided between each groove 1223.

[0063] The surface area of ​​the inner circumferential surface 1212 of the gap retaining portion 121 may be increased by the groove 1223 of the inner circumferential surface 1212 of the gap retaining portion 121. Specifically, when the groove 1223 is formed in the inner circumferential surface 1212 of the gap retaining portion 121, the surface area of ​​the inner circumferential surface 1212 of the gap retaining portion 121 may be increased compared to when the gap retaining portion 121 does not include the groove 1223.

[0064] Figure 7 is a cross-sectional perspective view of a second lens barrel according to another embodiment of the present disclosure, and Figure 8 yes Figure 7 A plan view of the second lens barrel.

[0065] refer to Figure 7and Figure 8 , a second lens barrel 120 according to another embodiment of the present disclosure will be described.

[0066] As described above, the second lens barrel 120 may include a main body portion 122 and a gap retaining portion 121. The gap retaining portion 121 may include a hole 1211. The gap retaining portion 121 may have a thickness. When viewed from the front of the second lens barrel 120, the hole 1211 of the gap retaining portion 121 may be circular. The gap retaining portion 121 may have a thickness in the optical axis direction. The width of the inner peripheral surface 1212 of the gap retaining portion 121 in the optical axis direction may be equal to the thickness of the gap retaining portion 121.

[0067] A groove 1233 may be formed in the inner circumferential surface 1212 of the gap holding portion 121. The groove 1233 may be a groove formed to be recessed from the inner circumferential surface 1212 of the gap holding portion 121 toward the outside of the second lens barrel 120. The groove 1233 may be formed in the inner circumferential surface 1212 of the gap holding portion 121 in a direction parallel to the optical axis. Figure 7 and Figure 8 As shown in , a plurality of grooves 1233 may be formed. A plurality of grooves 1233 may be provided in the circumferential direction of the second lens barrel 120. When viewed from the front of the second lens barrel 120, the inner circumferential surface 1212 of the gap retaining portion 121 may have a sawtooth shape. That is, when viewed from the front of the second lens barrel 120, each groove 1233 may be a groove including a curved shape, and a protrusion 1234 having a sharp end may be provided between each groove 1233.

[0068] The surface area of ​​the inner circumferential surface 1212 of the gap retaining portion 121 may be increased by the groove 1233 of the inner circumferential surface 1212 of the gap retaining portion 121. Specifically, when the groove 1233 is formed in the inner circumferential surface 1212 of the gap retaining portion 121, the surface area of ​​the inner circumferential surface 1212 of the gap retaining portion 121 may be increased compared to when the gap retaining portion 121 does not include the groove 1233.

[0069] Fig. 9 is a cross-sectional view of a lens assembly according to another embodiment of the present disclosure.

[0070] refer to Fig. 9 , another embodiment of the lens assembly will be described. Hereinafter, descriptions of components overlapping with the above-described components may be omitted.

[0071] The second lens barrel 120 may include a seating groove 1215. The seating groove 1215 may be formed on one side of the second lens barrel 120. In this case, the first lens barrel 110 may be disposed on the other side of the second lens barrel 120.

[0072] The seating groove 1215 may be formed in a circumferential direction of the second lens barrel 120. With respect to the optical axis, the seating groove 1215 may be disposed at a more outer side than the gap maintaining portion 121. That is, the gap maintaining portion 121 may be disposed between the seating groove 1215 and the optical axis.

[0073] The seating groove 1215 may overlap a portion of the first lens 20 in the optical axis direction. A space formed by the seating groove 1215 may be provided between the first lens 20 and the second lens barrel 120.

[0074] A sealing member 1216 may be provided in the seating groove 1215. The sealing member 1216 may be an O-ring. The sealing member 1216 may contact a portion of the inner surface of the seating groove 1215. In addition, the sealing member 1216 may contact a portion of the rear surface of the first lens 20.

[0075] The cover 40 may support the first lens 20 so that the first lens 20 is coupled to the second lens barrel 120. Since the cover 40 supports the first lens 20 and the sealing member 1216 is disposed between the first lens 20 and the second lens barrel 120, the first lens 20 may be prevented from rotating by friction between the sealing member 1216 and the first lens 20. In addition, the sealing member 1216 may prevent dust or moisture from entering the interior of the second lens barrel 120.

[0076] Fig.10 is a cross-sectional view of a lens assembly according to another embodiment of the present disclosure.

[0077] refer to Fig.10 , another embodiment of the lens assembly will be described. Hereinafter, descriptions of components overlapping with the above-described components may be omitted.

[0078] The first lens 20 may be disposed in front of the second lens barrel 120. The groove 50 may be formed in front of the second lens barrel 120 in the circumferential direction of the second lens barrel 120, and the first lens 20 may be embeddedly coupled to the groove 50 formed in front of the second lens barrel 120. That is, the outer circumferential surface of the first lens 20 may be disposed to contact the inner circumferential surface of the groove 50 formed in front of the second lens barrel 120. According to the present embodiment, the first lens 20 may be embeddedly coupled to the groove 50 formed in front of the second lens barrel 120, and thus the first lens 20 may be omitted. Figure 2 and Fig. 9The cover 40 for combining the first lens 20 is shown in FIG.

[0079] Fig.11 is a graph used to illustrate the thermal conductivity relationship between the lens and the lens barrel.

[0080] refer to Fig.11 With reference to the structure of the above-mentioned lens assembly, material properties of components included in the lens assembly and the resulting effects will be described.

[0081] The first lens barrel 110 and the lens group 30 disposed in the first lens barrel 110 may be made of a synthetic resin. In this case, the materials of the first lens barrel 110 and the lens group 30 may be different.

[0082] The thermal conductivity of the second lens barrel 120 may be higher than that of the first lens barrel 110. The second lens barrel 120 may be made of a material having a thermal conductivity greater than that of the first lens barrel 110. For example, the second lens barrel 120 may be made of a metal. The metal made of the second lens barrel 120 may be an alloy and may be selected in consideration of durability, corrosion resistance, and other considerations.

[0083] The first lens 20 disposed in front of the second lens barrel 120 may be made of synthetic resin or glass.

[0084] Since the materials of the first lens barrel 110 and the second lens barrel 120 are different, the thermal conductivity of the first lens barrel 110 is different from the thermal conductivity of the second lens barrel 120. In this case, it is more preferable that the thermal conductivity of the second lens barrel 120 is greater than that of the first lens barrel 110.

[0085] In addition, since the materials of the second lens barrel 120 and the first lens 20 are different, there is a difference between the thermal conductivity of the second lens barrel 120 and the thermal conductivity of the first lens 20. In this case, it is more preferable that the thermal conductivity of the second lens barrel 120 is greater than that of the first lens 20.

[0086] In order to prevent condensation from occurring on the image side surface of the first lens 20 when suddenly changing from a high temperature and high humidity environment to a low temperature environment, the thermal conductivity of the gap holding portion 121 may be set to be higher than the thermal conductivity of the first lens 20. Specifically, when the temperature of the gap holding portion 121 decreases to the dew point temperature before the temperature of the first lens 20 decreases to the dew point temperature due to the high thermal conductivity of the gap holding portion 121, condensation may occur on the inner peripheral surface 1212 of the gap holding portion 121 before condensation occurs on the image side surface of the first lens 20. In this case, since condensation first occurs on the inner peripheral surface 1212 of the gap holding portion 121, condensation on the image side surface of the first lens 20 may be prevented or reduced.

[0087] By the relationships of the following equations (1) to (3), it can be determined that the thermal conductivity of the gap retaining portion 121 is higher than the thermal conductivity of the first lens 20 .

[0088] CL <C。(1)

[0089]

[0090] In the above equations (1) to (3), C L is the thermal conductivity of the first lens 20, C S is the thermal conductivity of the gap holding portion 121, k L is the thermal conductivity of the first lens 20, k s is the thermal conductivity of the gap holding portion 121, A1 is the area of ​​the object side surface of the first lens 20, A2 is the area of ​​the image side surface of the first lens 20, t L is the thickness at the center of the first lens 20, t S is the thickness of the gap retaining portion 121, L S is the width from the outer peripheral surface of the hole 1211 of the gap retaining portion 121 to the inner peripheral surface of the lower portion of the gap retaining portion 121, and r s is the radius of the hole 1211 of the gap retaining portion 121 .

[0091] As set forth above, the lens assembly of the camera module according to the present disclosure prevents condensation from occurring in the lens assembly and prevents degradation of the performance of the camera module.

[0092] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. Lens assembly, including: a first lens barrel; a second lens barrel disposed in front of the first lens barrel and surrounding at least a portion of the first lens barrel; a first lens disposed in front of the second lens barrel so as to contact a portion of the second lens barrel; as well as A lens group is arranged in the first lens barrel, Wherein, the thermal conductivity coefficient of the second lens barrel is higher than the thermal conductivity coefficient of the first lens barrel.

2. The lens assembly according to claim 1, wherein: The first lens barrel is made of synthetic resin, and The second lens barrel is made of metal.

3. The lens assembly according to claim 1, wherein: The second lens barrel includes a gap holding portion and a main body portion, The first lens is disposed in front of the gap maintaining portion, and A portion of the first lens barrel is disposed inside the main body portion.

4. The lens assembly according to claim 3, wherein: The gap holding portion includes a hole extending in the optical axis direction and forming an inner peripheral surface of the gap holding portion, and A plurality of grooves are formed in the inner peripheral surface of the gap retaining portion, and the plurality of grooves extend in a circumferential direction of the inner peripheral surface.

5. The lens assembly according to claim 3, wherein: The gap holding portion includes a hole extending in the optical axis direction and forming an inner peripheral surface of the gap holding portion, and A plurality of grooves are formed in the inner peripheral surface of the gap retaining portion, and the plurality of grooves extend in the optical axis direction.

6. The lens assembly according to claim 5, wherein: The plurality of grooves form a waveform shape along the inner peripheral surface of the gap retaining portion when viewed from the front of the second lens barrel.

7. The lens assembly according to claim 5, wherein: The plurality of grooves form a sawtooth shape along the inner peripheral surface of the gap retaining portion when viewed from the front of the second lens barrel.

8. The lens assembly according to claim 1, wherein: The thermal conductivity of the second lens barrel is higher than the thermal conductivity of the first lens.

9. The lens assembly according to claim 1, wherein: The lens assembly also includes a cover supporting the first lens, and The cover is made of the same material as that of the second lens barrel.

10. The lens assembly according to claim 1, wherein: A seating groove is formed in a front surface of the second lens barrel in a circumferential direction of the second lens barrel, The seating groove overlaps with the first lens in the optical axis direction, and The lens assembly also includes a sealing member disposed in the seating groove.

11. Lens assembly, comprising: a first lens barrel; a second lens barrel disposed in front of the first lens barrel and surrounding at least a portion of the first lens barrel; A first lens is disposed in front of the second lens barrel; as well as A lens group is arranged in the first lens barrel, wherein the second lens barrel includes a gap maintaining portion that contacts the first lens and separates the first lens from the first lens barrel, and The thermal conductivity of the gap maintaining portion is higher than that of the first lens.

12. The lens assembly according to claim 11, wherein: A plurality of grooves recessed in a direction perpendicular to the optical axis direction are formed in the surface of the gap retaining portion.

13. The lens assembly according to claim 12, wherein: The gap holding portion includes a hole extending in the optical axis direction and forming an inner peripheral surface of the gap holding portion, and The plurality of grooves are formed along the inner peripheral surface of the gap retaining portion.

14. The lens assembly of claim 13, wherein: The plurality of grooves are arranged side by side in the optical axis direction.

15. The lens assembly of claim 12, wherein: the gap holding portion includes a hole extending in the optical axis direction and forming an inner peripheral surface of the gap holding portion, The longitudinal directions of the plurality of grooves are parallel to the optical axis direction, and The plurality of grooves are formed along the inner peripheral surface of the gap retaining portion.

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