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 to Korean Patent Application No. 10 - 2023 - 0140732, filed on October 19, 2023, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] This disclosure relates to a lens assembly applied to a camera module. Background art

[0004] Recently, vehicles such as automobiles 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 installed on the exterior of a vehicle is increasing.

[0005] Vehicles can operate in various environments and can operate in an environment 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 surfaces of components installed on the vehicle.

[0006] In the case of a camera module installed on the exterior of a vehicle, due to rapid temperature changes, condensation is likely to occur inside the camera module. In particular, in the case of a lens disposed at the outermost (front - most) of the camera module, the object side of the lens is directly exposed to the external environment, so 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 deteriorate due to condensation, a lens assembly capable of preventing condensation is required. Summary of the utility model

[0007] The provision of this Summary of the utility model section is intended to introduce, in brief form, a selection of concepts that will be further described in the Detailed Description section below. This Summary of the utility model section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

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

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

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

[0011] The gap holding portion may include a hole that extends in the optical axis direction and forms an inner circumferential surface of the gap holding portion, and a plurality of grooves may be formed in the inner circumferential surface of the gap holding portion and may extend in the circumferential direction of the inner circumferential surface.

[0012] The gap holding portion may include a hole that extends in the optical axis direction and forms an inner circumferential surface of the gap holding portion, and a plurality of grooves may be formed in the inner circumferential surface of the gap holding portion and may extend in the optical axis direction.

[0013] When viewed from the front of the second lens barrel, the plurality of grooves may form a corrugated shape along the inner circumferential surface of the gap holding portion.

[0014] When viewed from the front of the second lens barrel, the plurality of grooves may form a serrated shape along the inner circumferential surface of the gap holding portion.

[0015] The heat conduction coefficient of the second lens barrel may be higher than that of the first lens.

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

[0017] A mounting groove may be formed in the front surface of the second lens barrel in the circumferential direction of the second lens barrel. The mounting groove may overlap with the first lens in the optical axis direction, and the lens assembly may further include a sealing member disposed in the mounting 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 while surrounding at least a part 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 holding portion that contacts the first lens and separates the first lens from the first lens barrel, and the heat conduction coefficient of the gap holding portion is higher than that 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 holding portion.

[0020] The gap holding portion may include a hole that extends in the optical axis direction and forms an inner circumferential surface of the gap holding portion, and a plurality of grooves may be formed along the inner circumferential surface of the gap holding portion.

[0021] Multiple grooves may be arranged side by side in the optical axis direction.

[0022] The gap maintaining portion may include a hole that extends in the optical axis direction and forms an inner circumferential surface of the gap maintaining portion. The longitudinal direction of the multiple grooves may be parallel to the optical axis direction, and the multiple grooves may be formed along the inner circumferential surface of the gap maintaining 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 is Figure 1 a cross-sectional view of the lens assembly of

[0026] Figure 3 is Figure 2 a sectional perspective view of a second lens barrel of

[0027] Figure 4 is Figure 3 a cross-sectional view of the second lens barrel of

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

[0029] Figure 6 is Figure 5 a plan view of the second lens barrel of

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

[0031] Figure 8 is Figure 7 a plan view of the second lens barrel of

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

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

[0034] Figure 11 is a graph for showing a thermal conduction relationship between a first lens and a gap maintaining portion. DETAILED DESCRIPTION

[0035] The following specific embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and, except for the order of operations that must occur in a specific sequence, is not limited to the order set forth herein and may be changed, which will be apparent after understanding the disclosure of this application. Additionally, descriptions of features known in the art may be omitted for greater clarity and conciseness.

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

[0037] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, the element can be directly "on," directly "connected to," or directly "coupled to" the other element, or there can be one or more other elements intervening between the element and the other element. In contrast, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, there are no other elements intervening between the element and the other element.

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

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

[0040] Spatial relative terms such as "above", "upper", "below", and "lower" may be used herein for convenience of description to describe the relationship of one element relative to another as shown in the drawings. In addition to covering the orientations depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being "above" or "upper" relative to another element will be located "below" or "lower" relative to that other element. Thus, depending on the spatial orientation of the device, the term "above" covers both the 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 spatial relative terms used herein should be interpreted accordingly.

[0041] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the words "a", "an", and "the" are intended to include the plural forms as well. The words "comprising", "including", and "having" specify the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0042] For purposes of illustration, 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 a direction perpendicular to the optical axis may be referred to as the outer side, and the direction toward the optical axis in a direction perpendicular to the optical axis may be referred to as the inner side.

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

[0044] Referring to Figure 1 and Figure 2 will describe the coupling structure of a lens assembly according to an embodiment of the present disclosure.

[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. Referring to Figure 2, compared with the second lens barrel 120, the first lens barrel 110 can be arranged at the rear.

[0048] The first lens barrel 110 can be arranged closer to the image side than the second lens barrel 120. The radius of the first lens barrel 110 can narrow from front to back. The first lens barrel 110 can include a first body 111 and a second body 112. The first body 111 can be arranged relatively forward with respect to the second body 112. The radius of the first body 111 can be larger than the radius of the second body 112.

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

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

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

[0052] The first lens 20 can be placed at the very front of the lens assembly. The first lens 20 can be arranged on one side of the second lens barrel 120. The first lens 20 can be arranged to contact one side surface of the gap holding part 121 of the second lens barrel 120. The cross-section of the first lens 20 parallel to the optical axis can have an arched shape as shown in Figure 2 . The image side surface of the first lens 20 can be spaced apart from the object side surface of the foremost lens among the lenses of the lens group 30 arranged in the first lens barrel 110.

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

[0054] Figure 3 is Figure 2 a perspective sectional view of the second lens barrel, Figure 4 is Figure 3 a sectional view of the second lens barrel.

[0055] Reference Figure 3 and Figure 4 will describe Figure 2 the structure of the second lens barrel 120.

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

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

[0058] The surface area of the inner circumferential surface 1212 of the gap holding portion 121 can be increased by the groove 1213 of the inner circumferential surface 1212 of the gap holding portion 121. Specifically, when the groove 1213 is formed in the inner circumferential surface 1212 of the gap holding portion 121, the surface area of the inner circumferential surface 1212 of the gap holding portion 121 can be increased compared to when the gap holding 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 is Figure 5 a plan view of the second lens barrel.

[0060] Referring 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 holding portion 121. The gap holding portion 121 may include a hole 1211. The gap holding portion 121 may have a thickness. When viewed from the front of the second lens barrel 120, the hole 1211 of the gap holding portion 121 may be circular. The gap holding portion 121 may have a thickness in the optical axis direction. The width of the inner circumferential surface 1212 of the gap holding portion 121 in the optical axis direction may be equal to the thickness of the gap holding 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 recess 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. As Figure 5 and Figure 6 shown in, a plurality of grooves 1223 may be formed. The 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 holding portion 121 may have a corrugated 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 protruding portion 1224 may be provided between each groove 1223.

[0063] The surface area of the inner circumferential surface 1212 of the gap holding portion 121 may be increased by the grooves 1223 of the inner circumferential surface 1212 of the gap holding portion 121. Specifically, when the groove 1223 is formed in the inner circumferential surface 1212 of the gap holding portion 121, the surface area of the inner circumferential surface 1212 of the gap holding portion 121 may be increased as compared with when the gap holding 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 is Figure 7 a plan view of the second lens barrel.

[0065] Referring 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 holding portion 121. The gap holding portion 121 may include a hole 1211. The gap holding portion 121 may have a thickness. When viewed from the front of the second lens barrel 120, the hole 1211 of the gap holding portion 121 may be circular. The gap holding portion 121 may have a thickness in the optical axis direction. The width of the inner circumferential surface 1212 of the gap holding portion 121 in the optical axis direction may be equal to the thickness of the gap holding 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. As Figure 7 and Figure 8 shown, a plurality of grooves 1233 may be formed. The 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 holding portion 121 may have a serrated 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 protruding portion 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 holding portion 121 may be increased by the grooves 1233 of the inner circumferential surface 1212 of the gap holding portion 121. Specifically, when the groove 1233 is formed in the inner circumferential surface 1212 of the gap holding portion 121, the surface area of the inner circumferential surface 1212 of the gap holding portion 121 may be increased compared to when the gap holding portion 121 does not include the groove 1233.

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

[0070] Referring to Figure 9 , another embodiment of the lens assembly will be described. Hereinafter, the description of components overlapping with the above components may be omitted.

[0071] The second lens barrel 120 may include a mounting groove 1215. The mounting 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 mounting groove 1215 may be formed in the circumferential direction of the second lens barrel 120. With respect to the optical axis, the mounting groove 1215 may be disposed more outward than the clearance holding portion 121. That is, the clearance holding portion 121 may be disposed between the mounting groove 1215 and the optical axis.

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

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

[0075] The cover 40 may support the first lens 20 such 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, rotation of the first lens 20 may be prevented by the frictional force 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] Figure 10 is a cross-sectional view of a lens assembly according to another embodiment of the present disclosure.

[0077] Reference Figure 10 will describe another embodiment of the lens assembly. Hereinafter, the description of components overlapping with the above components may be omitted.

[0078] The first lens 20 may be disposed in front of the second lens barrel 120. A 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 integrally 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 in contact with 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 integrally coupled to the groove 50 formed in front of the second lens barrel 120, and thus Figure 2 and Figure 9The cover 40 for coupling the first lens 20 shown in

[0079] Figure 11 is a graph for showing the thermal conduction relationship between the lens and the lens barrel.

[0080] Referring to Figure 11 and the structure of the above lens assembly, the material properties and the resulting effects of the components included in the lens assembly 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 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 coefficient 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 higher thermal conductivity than the thermal conductivity of the first lens barrel 110. For example, the second lens barrel 120 may be made of metal. The metal used to make the second lens barrel 120 may be an alloy, and it may be selected considering 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 conductivities of the first lens barrel 110 and the second lens barrel 120 are different. 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] To prevent condensation from occurring on the image side 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 drops to the dew point temperature before the temperature of the first lens 20 drops 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 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 of the first lens 20 can be prevented or reduced.

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

[0088] CL < C. (1)

[0089]

[0090] In the above equations (1) to (3), C L is the thermal conductivity coefficient of the first lens 20, C S is the thermal conductivity coefficient 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 central thickness of the first lens 20, t S is the thickness of the gap holding portion 121, L S is the width from the outer peripheral surface of the hole 1211 of the gap holding portion 121 to the inner peripheral surface of the lower portion of the gap holding portion 121, and r s is the radius of the hole 1211 of the gap holding portion 121.

[0091] As described above, the lens assembly of the camera module according to the present disclosure prevents condensation from occurring in the lens assembly and prevents deterioration 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 can 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 applicable to similar features or aspects in other examples. Appropriate results can still be achieved if the described techniques are performed in a different order, and / or if the components in the described system, architecture, device, or circuit are combined in a different way and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is not limited by the specific embodiments, but is defined 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. A lens assembly, characterized in that, The lens assembly includes: A first lens barrel; A second lens barrel, disposed in front of the first lens barrel and surrounding at least a part of the first lens barrel; and A first lens, disposed in front of the second lens barrel in contact with a part of the second lens barrel, wherein the heat conduction coefficient of the second lens barrel is higher than that 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-holding portion, and A part 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 that extends in the optical axis direction and forms the inner peripheral surface of the gap-holding portion, and A plurality of grooves are formed in the inner peripheral surface of the gap-holding portion, and the plurality of grooves extend in the circumferential direction of the inner peripheral surface.

5. The lens assembly according to claim 3, wherein, The gap-holding portion includes a hole that extends in the optical axis direction and forms the inner peripheral surface of the gap-holding portion, and A plurality of grooves are formed in the inner peripheral surface of the gap-holding portion, and the plurality of grooves extend in the optical axis direction.

6. The lens assembly according to claim 5, characterized in that, When viewed from the front of the second lens barrel, the plurality of grooves form a wavy shape along the inner peripheral surface of the gap-holding portion.

7. The lens assembly according to claim 5, characterized in that, When viewed from the front of the second lens barrel, the plurality of grooves form a serrated shape along the inner peripheral surface of the gap-holding portion.

8. The lens assembly according to claim 1, wherein The heat conduction coefficient of the second lens barrel is higher than that of the first lens.

9. The lens assembly according to claim 1, wherein, The lens assembly further includes a cover that supports 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, An installation groove is formed in the front surface of the second lens barrel in the circumferential direction of the second lens barrel, The installation groove overlaps with the first lens in the optical axis direction, and The lens assembly further includes a sealing member disposed in the installation groove.

11. Lens assembly, characterized in that, The lens assembly includes: A first lens barrel; A second lens barrel, disposed in front of the first lens barrel and surrounding at least a part 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-holding portion that contacts the first lens and separates the first lens from the first lens barrel, and The heat conduction coefficient of the gap-holding 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-holding portion.

13. The lens assembly according to claim 12, characterized in that, The gap-holding portion includes a hole that extends in the optical axis direction and forms the inner peripheral surface of the gap-holding portion, and The plurality of grooves are formed along the inner peripheral surface of the gap-holding portion.

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

15. The lens assembly according to claim 12, wherein The gap-holding portion includes a hole that extends in the optical axis direction and forms the inner peripheral surface of the gap-holding portion, The longitudinal direction of the plurality of grooves is parallel to the optical axis direction, and the plurality of grooves are formed along the inner peripheral surface of the gap holding portion.

Images