A lens assembly

Abstract

Embodiments of the present disclosure provide a lens assembly, comprising: a lens barrel and a first lens accommodated in an accommodation space, the lens barrel comprising a top wall and a side wall extending from the top wall to a direction close to an image side; the top wall comprising a first surface, the first lens comprising an optical portion and a structure portion surrounding the optical portion and configured to be supported, the structure portion comprising an object side surface facing an object side direction, the object side surface comprising an abutting surface directly abutting the first surface; the first surface comprising an inner edge, an outer edge close to the side wall, and a groove recessed in the object side direction, the groove comprising a first groove extending outward from a side close to the inner edge to a communication port and a second groove extending from the communication port to a side close to the outer edge in a bent manner, a projection of the communication port along a direction parallel to an optical axis direction being located in the abutting surface, a first groove opening close to the inner edge of the first groove having a first groove width, a second groove opening close to the outer edge of the second groove having a second groove width, and the first groove width being smaller than the second groove width.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of optical imaging equipment technology, and specifically relate to a lens assembly. Background Technology

[0002] In the field of optical device manufacturing and assembly, lens assemblies consist of the lens barrel and lenses. The cleanliness of the lens assembly is crucial, as even the smallest contaminants can directly affect image quality. To ensure internal lens cleanliness, the assembly process often includes washing and drying steps. To facilitate the smooth drainage of cleaning fluid and moisture during drying, venting or flow channels are typically created on the inner top surface of the lens assembly (the surface that contacts the lenses).

[0003] Currently, a common practice in the industry is to use a simple "I"-shaped groove. However, during the water washing verification process, water stains after washing can easily remain in and around the relatively simple "I"-shaped groove. In the subsequent drying stage, due to the limited capacity of the groove and the simple flow channel structure, an efficient gas escape path cannot be formed, causing the trapped water vapor to not be completely and smoothly discharged in a short time. This water vapor that cannot be discharged in time may condense again at high temperatures or carry impurities to re-adhere to the lens surface, ultimately causing irreversible dirt inside the lens, thus seriously affecting the yield rate of lens components and long-term reliability.

[0004] Therefore, there is an urgent need for a new lens assembly structure design to solve the lens contamination problem caused by poor drainage and venting. Utility Model Content

[0005] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a lens assembly and electronic device.

[0006] A first aspect of the embodiments of this disclosure provides a lens assembly, comprising: A lens barrel having a receiving space and a first lens received within the receiving space, the lens barrel including a top wall near the object side and having a light-transmitting hole and a side wall extending from the top wall toward the image side; The top wall includes a first surface facing the image side direction, the first lens includes an optical part for imaging and a structural part surrounding the optical part and for support, the structural part includes an object side surface facing the object side direction, and the object side surface includes an abutting surface that directly abuts the first surface; The first surface includes an inner edge near the optical axis, an outer edge near the sidewall, and a groove recessed towards the object side. The groove includes a first groove extending outward from the side near the inner edge to the communication opening and a second groove extending bent outward from the communication opening towards the side near the outer edge. The communication opening is located in the abutment surface along a projection parallel to the optical axis. The first groove opening near the inner edge of the first groove has a first groove width, and the second groove opening near the outer edge of the second groove has a second groove width. The first groove width is smaller than the second groove width.

[0007] Optionally, along the circumference of the top wall, the first surface is recessed with 2-30 grooves at intervals.

[0008] Optionally, the width of the first slot is 20-99 micrometers, and the width of the second slot is 21-100 micrometers.

[0009] Optionally, the first slot has a first center point, the second slot has a second center point, and the connecting port has a connecting center point, wherein the line connecting the first center point to the connecting center point and the line connecting the second center point to the connecting center point form a first angle, the first angle being greater than or equal to 30° and less than 180°.

[0010] Optionally, the first surface includes a first side and a second side forming the first groove, the first side and the second side being disposed opposite to each other and parallel to each other, and the first surface includes a third side and a fourth side forming the second groove, the third side and the fourth side being disposed opposite to each other and parallel to each other.

[0011] Optionally, the first surface includes a first side and a second side forming the first groove, the first side and the second side being disposed opposite to each other. The first surface also includes a third side and a fourth side forming the second groove, the third side and the fourth side being disposed opposite to each other. The first side and the second side form a second included angle along the extension direction of the first groove, the second included angle being greater than 0° and less than or equal to 10°. The third side and the fourth side form a third included angle along the extension direction of the second groove, the third included angle being greater than 0° and less than or equal to 10°.

[0012] Optionally, the first surface includes a first side and a second side forming the first groove, the first side and the second side being disposed opposite to each other, the first surface including a third side and a fourth side forming the second groove, the third side and the fourth side being disposed opposite to each other, and the first side, the second side, the third side and the fourth side all being arc-shaped.

[0013] Optionally, the projection of the first groove along the direction parallel to the optical axis lies within the abutment surface.

[0014] Optionally, the projection of the second groove along the direction parallel to the optical axis lies within the abutment surface.

[0015] Optionally, the depth of the groove is 4-15 micrometers.

[0016] The beneficial effects of the embodiments of this disclosure include: This application's lens assembly effectively solves the lens contamination problems caused by residual water stains after washing and poor air venting during drying, as found in existing technologies, by designing a groove with a bent structure on the first surface. The groove consists of a first groove and a second groove connected together, forming a bent groove flow channel extending from the inner edge to the outer edge of the first surface. The width of the first groove is smaller than that of the second groove, and the connection opening is located within the projection area of ​​the contact surface. This design significantly increases the effective volume of the groove and the length of the flow channel, generating stronger capillary action and siphon effect during the drying process. This actively guides and accelerates the efficient discharge of residual moisture along the bent path, ensuring the cleanliness between the lenses and greatly improving product yield and reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the top wall structure of the lens tube according to an embodiment of the present disclosure; Figure 2 for Figure 1 Enlarged diagram of section K in the middle; Figure 3 This is an enlarged schematic diagram of part K in another embodiment; Figure 4 This is an enlarged schematic diagram of part K in another embodiment; Figure 5 This is a schematic diagram of the structure of a lens assembly according to an embodiment of the present disclosure; Figure 6 This is a schematic diagram of the structure of the lens tube according to an embodiment of the present disclosure; Figure 7 This is a schematic diagram of the structure of a first lens according to an embodiment of the present disclosure.

[0018] In the diagram, 10 is the lens assembly; 20 is the optical axis; 1 is the lens barrel; and 2 is the first lens. 11. Reception space; 12. Top wall; 13. Light-transmitting hole; 14. Side wall; 121. First surface; 1211. Inner edge; 1212. Groove; 1213. Outer edge; 1214. First slot; 1215. Connecting opening; 1216. Second slot; 21. Optical part; 22. Structural part; 221. Object side; 2211. Abutting surface; 12141. First side; 12142. Second side; 12143. First slot opening; 12161. Third side; 12162. Fourth side; 12163. Second slot opening. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0021] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0022] like Figure 1-7 As shown, a lens assembly 10 includes: a barrel 1 having a receiving space 11 and a first lens 2 received within the receiving space 11. The barrel 1 includes a top wall 12 near the object side and having a light-transmitting hole 13 and a side wall 14 extending from the top wall 12 toward the image side.

[0023] The top wall 12 includes a first surface 121 facing the image side direction. The first lens 2 includes an optical part 21 for imaging and a structural part 22 surrounding the optical part 21 and for support. The structural part 22 includes an object side surface 221 facing the object side direction. The object side surface 221 includes an abutting surface 2211 that directly abuts against the first surface 121. The abutting surface 2211 is annular and includes an inner ring edge 2211a with the smallest diameter and an outer ring edge 2211b with the largest diameter.

[0024] The first surface 121 includes an inner edge 1211 near the optical axis 20, an outer edge 1213 near the sidewall 14, and a groove 1212 recessed towards the object side. The groove 1212 includes a first groove 1214 extending outward from the side near the inner edge 1211 to the communication port 1215, and a second groove 1216 extending from the communication port 1215 towards the side near the outer edge 1213. The projection of the communication port 1215 along a direction parallel to the optical axis 20 is located within the abutment surface 2211, that is, between the inner ring edge 2211a and the outer ring edge 2211b. For ease of understanding, in Figure 1 The assembly positions of the inner ring edge 2211a and the outer ring edge 2211b are marked with dashed lines. The first slot 12143 of the first slot 1214 near the inner edge 1211 has a first slot width A, and the second slot 12163 of the second slot 1216 near the outer edge 1213 has a second slot width B. The first slot width A is smaller than the second slot width B.

[0025] It is understood that the maximum distance along a straight line perpendicular to the direction of extension of the groove wall at the opening position of the first groove 12143 is the first groove width A. Similarly, the maximum distance along a straight line perpendicular to the direction of extension of the groove wall at the opening position of the second groove 12163 is the second groove width B.

[0026] The lens assembly 10 of this application effectively solves the lens contamination problem caused by water stains after washing and poor air venting during drying, which is present in the prior art, by designing a groove 1212 with a bent structure on the first surface 121. The groove 1212 is composed of a first groove 1214 and a second groove 1216 that are connected to form a bent flow channel extending from the inner edge 1211 of the first surface 121 to its outer edge 1213. The groove width of the first groove 1214 is smaller than that of the second groove 1216, and the connecting opening 1215 is located within the projection area of ​​the contact surface 2211. This design significantly increases the effective volume and flow channel length of the groove 1212, and generates a stronger capillary action and siphon effect during the drying process. This can guide and accelerate the efficient discharge of residual water vapor along the bent path, ensuring the cleanliness between the lenses and greatly improving the product yield and reliability.

[0027] In some embodiments, along the circumference of the top wall 12, the first surface 121 is provided with 2-30 recesses 1212 at intervals.

[0028] Specifically, on the first surface 121 of the top wall 12, 2 to 30 grooves 1212 are uniformly recessed at predetermined intervals along the circumference of the top wall 12. This circumferentially distributed design of multiple grooves 1212 forms an annular exhaust and drainage network on the first surface 121 of the lens barrel 1. Furthermore, when multiple grooves 1212 work together, the total cross-sectional area and volume of the flow channel for discharging water vapor and air are significantly increased. In addition, the uniformly arranged grooves 1212 ensure effective capture and guidance of residual liquid in the circumferential direction of the lens assembly 10.

[0029] During the drying process, multiple grooves 1212 form multiple parallel and balanced escaping channels, allowing water vapor to be quickly and synchronously extracted from the entire contact surface 2211 ring area, effectively eliminating water accumulation dead corners caused by poor local venting.

[0030] In some embodiments, 2, 4, 6, 8, 20, 28, or 30 recesses 1212 are uniformly recessed at predetermined intervals on the first surface 121 along the top wall 12 circumferentially upwards. It is understood that the number of recesses 1212 is set as needed in the range of 2-30, and the specific number of recesses includes, but is not limited to, the above values.

[0031] In some embodiments, the first groove width A is 20-99 micrometers and the second groove width B is 21-100 micrometers. An appropriate groove width can improve the molding yield of the lens barrel.

[0032] In some embodiments, the first groove width A of the first groove 1214 is set to 20, 30, 50, 80, or 99 millimeters. It is understood that the first groove width A of the first groove 1214 is set as needed within the range of 20-99 micrometers, and the specific groove width includes, but is not limited to, the values ​​mentioned above.

[0033] In some embodiments, the second groove width B of the third groove 1218 is set to 21, 40, 50, 80, or 100 millimeters. It is understood that the second groove width B of the third groove 1218 is set as needed within the range of 21-100 micrometers, and the specific groove width includes, but is not limited to, the values ​​mentioned above.

[0034] In some embodiments, reference is made to Figure 2 or Figure 3 The first slot 12143 has a first center point D1, the second slot 12163 has a second center point D3, and the connecting port 1215 has a connecting center point D2. The line connecting the first center point D1 to the connecting center point D2 and the line connecting the second center point D3 to the connecting center point D2 form a first angle C, which is greater than or equal to 30° and less than 180°.

[0035] It is understood that the first center point D1 is the geometric center of the opening of the first groove 1214 near the inner side of the optical axis 20 (i.e., the first groove opening 12143). The second center point D3 is the geometric center of the opening of the second groove 1216 near the outer side of the side wall 14 of the lens barrel 1 (i.e., the second groove opening 12163). The connecting center point D2 is the geometric center of the connection between the first groove 1214 and the second groove 1216 (i.e., the connecting port 1215), wherein this connecting center point is the turning point where the flow direction of the groove 1212 changes.

[0036] In this application, by limiting the first included angle C formed by the first center point, the connecting center point and the second center point to be greater than or equal to 30° and less than 180°, the entire groove 1212 flow channel is formed as a bent flow channel from the inner edge 1211 to the outer edge 1213. This bent flow channel design significantly increases the effective length of the flow channel, provides a longer stroke for capillary action, thereby enhancing the "pumping" effect and helping to guide residual liquid outward from the depth of the contact surface 2211.

[0037] In some embodiments, the first included angle C is set to 30°, 50°, 80°, 150°, or 170°. It is understood that the included angle C is set as needed within the range of greater than or equal to 30° and less than 180°, and the specific included angle includes, but is not limited to, the values ​​mentioned above.

[0038] In some embodiments, the first surface 121 includes a first side 12141 and a second side 12142 forming the first groove 1214, the first side 12141 and the second side 12142 being disposed opposite to each other and parallel to each other. The first surface 121 also includes a third side 12161 and a fourth side 12162 forming the second groove 1216, the third side 12161 and the fourth side 12162 being disposed opposite to each other and parallel to each other, so that the first groove 1214 and the second groove 1216 can provide stable capillary force to ensure that the liquid is discharged in a directional and smooth manner.

[0039] refer to Figure 4 In some embodiments, the first side 12141 and the second side 12142 form a second included angle E along the extension direction of the first groove 1214, the second included angle E being greater than 0° and less than or equal to 10°, and the third side 12161 and the fourth side 12162 form a third included angle F along the extension direction of the second groove 1216, the third included angle F being greater than 0° and less than or equal to 10°.

[0040] In this application, the groove 1212 formed by the first groove 1214 and the second groove 1216 as described above can generate a stronger capillary pump effect, actively guide the liquid to converge to the bottom of the groove and accelerate its outward discharge, effectively preventing stagnation.

[0041] In some embodiments, the second included angle E is set to 2°, 5°, 8°, or 10°. It is understood that the included angle E is set as needed within the range of greater than 0° and less than or equal to 10°, and the specific included angle includes, but is not limited to, the values ​​mentioned above.

[0042] In some embodiments, the third included angle F is set to 2°, 5°, 8°, or 10°. It is understood that the included angle F is set as needed within the range of greater than 0° and less than or equal to 10°, and the specific included angle includes, but is not limited to, the values ​​mentioned above.

[0043] refer to Figure 3 The first side 12141 and the second side 12142 are arc-shaped, and the third side 12161 and the fourth side 12162 are arc-shaped.

[0044] In this application, the two opposite sides of the first groove 1214 and the second groove 1216 are both designed as arcs, which significantly optimizes the hydrodynamic performance. The arc edges provide a smoother and more efficient guiding path for liquid flow, effectively reducing flow resistance and avoiding turbulence or dead zones. At the same time, it enhances the capillary adsorption effect of the channels, which can more actively guide the liquid to be discharged efficiently in a predetermined direction, thereby significantly improving the reliability and efficiency of drainage and venting, and preventing water stains from causing lens contamination.

[0045] In some embodiments, the projection of the first groove 1214 along a direction parallel to the optical axis 20 is located within the abutment surface 2211.

[0046] In some embodiments, the projection of the second groove 1216 along a direction parallel to the optical axis 20 is located within the abutment surface 2211.

[0047] In this application, the above design further increases the overlapping area between the first groove or the second groove and the contact surface, which can ensure that the groove 1212 structure covers the lens bearing area, effectively guides residual liquid, and achieves effective cleaning.

[0048] In some embodiments, the depth of the groove 1212 is 4-15 micrometers. The depth of the groove refers to the height difference between the bottom surface of the groove near the object side and the first surface in a direction parallel to the optical axis. When the depth of the groove 1212 is set to 4-15 micrometers, the volume and capillary force of the groove 1212 can be significantly increased, thereby more effectively accommodating and guiding liquid out and avoiding water stains.

[0049] In some embodiments, the depth of the groove 1212 is set to 4, 6, 8, 13, or 15 millimeters. It is understood that the depth of the groove 1212 is set as needed within the range of 4-15 micrometers, and the specific depth includes, but is not limited to, the values ​​mentioned above.

[0050] In some embodiments, the lens barrel 1 is made of plastic.

[0051] For details, please refer to the following: Figure 1 In this application, the straight slot structure of the related technology is designed with a bent groove 1212, and four grooves 1212 are provided along the axial direction of the lens barrel 1. Among them, the first groove width A of the first groove 1214 is 20u, and the second groove width B of the second groove 1216 is 21u.

[0052] For details, please refer to the following: Figure 1-2 In one example, the first surface 121 includes a first side 12141 and a second side 12142 forming a first groove 1214, the first side 12141 and the second side 12142 being disposed opposite to each other and parallel to each other, and the first surface 121 includes a third side 12161 and a fourth side 12162 forming a second groove 1216, the third side 12161 and the fourth side 12162 being disposed opposite to each other and parallel to each other.

[0053] For details, please refer to the following: Figure 4 In another example, the first surface 121 includes a first side 12141 and a second side 12142 forming a first groove 1214, and the first surface 121 includes a third side 12161 and a fourth side 12162 forming a second groove 1216. The first side 12141 and the second side 12142 form a second included angle E of 5° along the extension direction of the first groove 1214, and the third side 12161 and the fourth side 12162 form a third included angle F of 5° along the extension direction of the second groove 1216.

[0054] In one embodiment, four grooves 1212 are equally spaced recessed into the first surface 121, and the first included angle C corresponding to each groove 1212 is arranged sequentially in a counterclockwise direction.

[0055] In another embodiment, four grooves 1212 are equally spaced recessed on the first surface 121, and the first included angle C corresponding to each groove 1212 is arranged sequentially in a clockwise direction.

[0056] In one embodiment, a plurality of grooves 1212 are equally spaced recessed on the first surface 121, and a portion of the grooves 1212 are arranged in a counterclockwise direction with the first included angle C facing the direction, while the other portion of the grooves 1212 are arranged in a clockwise direction with the first included angle C facing the direction.

[0057] like Figure 1 As shown, four grooves 1212 are equally spaced on the first surface 121 of the lens barrel 1. The first included angle C of two adjacent grooves 1212 with a spacing is arranged in a counterclockwise direction, and the first included angle C of the other two adjacent grooves 1212 with a spacing is arranged in a clockwise direction.

[0058] In this application, water flows easily from large pores to small pores, but it is difficult to flow from large pores to small pores. That is, water vapor flows easily from the second groove 1216 to the first groove 1214. This phenomenon is mainly driven by capillary force (the additional pressure formed by the difference in surface tension and wettability of liquid in a narrow channel). The smaller the pore, the greater the capillary force. Water molecules will move from relatively large pores to finer pores. In the opposite direction, water molecules do not easily enter fine pores.

[0059] In addition, it is easier for air to flow from the large hole to the small hole, that is, it is easier for air to flow from the second groove 1216 to the first groove 1214. When air flows from the large hole to the small hole, the diffusion resistance of molecules at the edge of the large hole is small, so the flow is smoother.

[0060] Furthermore, the curved design of the groove 1212, with its longer channel, allows air to enter and exit more easily than water. The plastic material of the lens barrel 1 is hydrophilic, allowing a small number of water molecules to be more easily adsorbed onto the surface of the groove 1212 channel during flow, thus preventing other water molecules from entering the channel. Therefore, moisture does not easily enter the lens from the outside. When the ambient temperature rises, the air volume inside the lens increases, causing the water molecules adsorbed on the surface of the groove 1212 channel to evaporate to the outside.

[0061] In summary, the lens assembly 10 of this application can reduce the amount of water entering the device during water washing and improve the exhaust and drainage efficiency for high temperature and high humidity reliability.

[0062] A second aspect of the embodiments of this disclosure is to provide an electronic device that includes a lens assembly 10 as described above.

[0063] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A lens assembly, characterized in that, include: A lens barrel having a receiving space and a first lens received within the receiving space, the lens barrel including a top wall near the object side and having a light-transmitting hole and a side wall extending from the top wall toward the image side; The top wall includes a first surface facing the image side direction, the first lens includes an optical part for imaging and a structural part surrounding the optical part and for support, the structural part includes an object side surface facing the object side direction, and the object side surface includes an abutting surface that directly abuts the first surface; The first surface includes an inner edge near the optical axis, an outer edge near the sidewall, and a groove recessed towards the object side. The groove includes a first groove extending outward from the side near the inner edge to the communication opening and a second groove extending bent outward from the communication opening towards the side near the outer edge. The communication opening is located in the abutment surface along a projection parallel to the optical axis. The first groove opening near the inner edge of the first groove has a first groove width, and the second groove opening near the outer edge of the second groove has a second groove width. The first groove width is smaller than the second groove width.

2. A lens assembly according to claim 1, characterized in that, Along the circumference of the top wall, the first surface is recessed with 2-30 grooves at intervals.

3. A lens assembly according to claim 1, characterized in that, The width of the first slot is 20-99 micrometers, and the width of the second slot is 21-100 micrometers.

4. A lens assembly according to claim 1, characterized in that, The first slot has a first center point, the second slot has a second center point, and the connecting port has a connecting center point. The line connecting the first center point to the connecting center point and the line connecting the second center point to the connecting center point form a first angle, which is greater than or equal to 30° and less than 180°.

5. A lens assembly according to claim 1, characterized in that, The first surface includes a first side and a second side forming the first groove, the first side and the second side being disposed opposite to each other and parallel to each other; the first surface also includes a third side and a fourth side forming the second groove, the third side and the fourth side being disposed opposite to each other and parallel to each other.

6. A lens assembly according to claim 1, characterized in that, The first surface includes a first side and a second side forming the first groove, the first side and the second side being disposed opposite to each other. The first surface also includes a third side and a fourth side forming the second groove, the third side and the fourth side being disposed opposite to each other. The first side and the second side form a second included angle along the extension direction of the first groove, the second included angle being greater than 0° and less than or equal to 10°. The third side and the fourth side form a third included angle along the extension direction of the second groove, the third included angle being greater than 0° and less than or equal to 10°.

7. A lens assembly according to claim 1, characterized in that, The first surface includes a first side and a second side forming the first groove, the first side and the second side being disposed opposite to each other. The first surface also includes a third side and a fourth side forming the second groove, the third side and the fourth side being disposed opposite to each other. The first side, the second side, the third side and the fourth side are all arc-shaped.

8. A lens assembly according to claim 1, characterized in that, The projection of the first groove along the direction parallel to the optical axis lies within the contact surface.

9. A lens assembly according to claim 1, characterized in that, The projection of the second groove along the direction parallel to the optical axis lies within the contact surface.

10. A lens assembly according to claim 1, characterized in that, The depth of the groove is 4-15 micrometers.

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