Camera module

Abstract

This camera module comprises: a first body including a first side plate; a second body including a second side plate facing the first side plate in an optical axis direction; and a weld portion at least partially disposed between the first side plate and the second side plate, wherein a formation region of the weld portion includes an upper region, a central region, and a lower region with respect to the optical axis direction, at least a portion of the upper region overlaps with the first body in a direction perpendicular to the optical axis direction, at least a portion of the lower region overlaps with the second body in a direction perpendicular to the optical axis direction, and average sizes of crystal grains constituting each of the upper region, the central region, and the lower region are different from one another.

Description

camera module

[0001] This embodiment relates to a camera module.

[0002]

[0003] Recently, ultra-small camera modules have been developed and are widely used in small electronic products such as smartphones, laptops, and game consoles.

[0004] As automobiles become more widespread, miniature cameras are increasingly being used not only in small electronic devices but also in vehicles. Examples include black box cameras for vehicle protection or to collect objective data on traffic accidents, rearview cameras that allow drivers to monitor blind spots at the rear of the vehicle, ensuring safety when backing up, and perimeter cameras that monitor the vehicle's surroundings.

[0005] A camera may be equipped with a lens, a lens holder that accommodates the lens, an image sensor that converts an image of a subject captured by the lens into an electrical signal, and a printed circuit board on which the image sensor is mounted. The housing that forms the exterior of the camera is configured with a sealed structure throughout to prevent internal components from being contaminated by foreign substances containing moisture.

[0006]

[0007] The present embodiment provides a camera module in which a plurality of bodies can be firmly connected.

[0008]

[0009] A camera module according to the present embodiment comprises: a first body including a first side plate; a second body including a second side plate facing the first side plate in an optical axis direction; and a welded portion at least partially disposed between the first side plate and the second side plate, wherein a formation area of ​​the welded portion includes an upper region, a central region, and a lower region based on the optical axis direction, wherein at least a portion of the upper region overlaps with the first body in a direction perpendicular to the optical axis direction, and the lower region overlaps with the second body in a direction perpendicular to the optical axis direction, and wherein average sizes of crystal grains constituting each of the upper region, the central region, and the lower region are different from each other.

[0010] The average size of the crystal grains constituting the lower region may be smaller than the average size of the crystal grains constituting the upper region and the average size of the crystal grains constituting the central region, respectively.

[0011] The average size of the crystal grains constituting the central region may be smaller than the average size of the crystal grains constituting the upper region.

[0012] Based on the direction perpendicular to the optical axis, the thickness of the first side plate may be thicker than the thickness of the second side plate.

[0013] The first body includes a first guide that overlaps at least a portion of the second side plate in a direction perpendicular to the optical axis, and the sum of the thicknesses of the first guide and the first side plate may be at least twice the thickness of the second side plate.

[0014] The average size of the crystal grains constituting the upper region may be at least twice the average size of the crystal grains constituting the lower region.

[0015] Based on the direction perpendicular to the optical axis, the joining region of the first body and the second body includes an outer region, a connection region arranged on the inner side of the outer region, and an inner region arranged on the inner side of the connection region, and the average sizes of crystal grains constituting each of the outer region, the connection region, and the inner region may be different.

[0016] The average size of the crystal grains constituting the inner region may be smaller than the average size of the crystal grains constituting the outer region and the average size of the crystal grains constituting the connecting region, respectively.

[0017] The inner region may include a plurality of regions divided based on the optical axis-wise separation region between the first side plate and the second side plate.

[0018] The average size of the crystal grains constituting the outer region may be smaller than the average size of the crystal grains constituting the connection region.

[0019]

[0020] This embodiment has the advantage of improving the bonding strength between multiple bodies due to increased strength by forming regions having different crystal grain sizes by considering the structure of the body.

[0021]

[0022] FIG. 1 is a perspective view showing the appearance of a camera module according to an embodiment of the present invention.

[0023] Figure 2 is an exploded perspective view of a camera module according to an embodiment of the present invention.

[0024] Figure 3 is a cross-sectional view of a camera module according to an embodiment of the present invention.

[0025] Figure 4 is an enlarged view of A in Figure 3.

[0026] FIG. 5 is a drawing dividing the joining area of ​​the first body and the second body by location according to an embodiment of the present invention.

[0027] FIG. 6 is a drawing of a crystal particle photographed in a bonding area of ​​a first body and a second body according to an embodiment of the present invention.

[0028] Figures 7 to 9 are drawings for explaining the difference in size of crystal particles in each region divided in Figures 5 and 6.

[0029] FIG. 10 is a drawing dividing the joining area of ​​the first body and the second body by location according to an embodiment of the present invention.

[0030] Figures 11 to 13 are drawings for explaining the difference in size of crystal particles in each area sectioned in Figure 10.

[0031]

[0032] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0033] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0034] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0035] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0036] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0037] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

[0038] And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, it may include not only cases where the component is 'connected', 'coupled', or 'connected' directly to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.

[0039] Additionally, when described as being formed or arranged "above" or "below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," the meaning may include not only the upward direction but also the downward direction based on one component.

[0040] The term 'optical axis direction' used below is defined as the optical axis direction of the lens. Meanwhile, 'optical axis direction' may correspond to 'up-down direction', 'x-axis direction', etc.

[0041] Below, a camera module according to the present embodiment is described with reference to the drawings.

[0042] FIG. 1 is a perspective view showing the appearance of a camera module according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a camera module according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of a camera module according to an embodiment of the present invention, and FIG. 4 is an enlarged view of A of FIG. 3.

[0043] Referring to FIGS. 1 to 4, a camera module (10) according to an embodiment of the present invention may be a vehicle camera module. The camera module (10) may be coupled to a vehicle. The camera module (10) may be used in at least one of a front camera, a side camera, a rear camera, an interior camera, and a black box of the vehicle. The camera module (10) may be placed at the front of the vehicle. The camera module (10) may be placed at the rear of the vehicle. The camera module (10) may be coupled to the windshield of the vehicle. The camera module (10) may be coupled to the windshield of the front or rear of the vehicle. The camera module (10) may be placed on the side of the vehicle. The camera module (10) may be placed inside the vehicle. The camera module (10) may photograph a subject and output the image as an image on a display (not shown).

[0044] The camera module (10) may include a first body (100), a second body (200), a lens module (300), a substrate (400), and a welded portion (500).

[0045] The camera module (10) may include a first body (100). The first body (100) may be named any one of a front body, an upper housing, a first housing, and a front cover. The first body (100) may form the outer shape of the camera module (10) by combining with a second body (200). Based on the optical path, the first body (100) may be arranged in front of the second body (200). The first body (100) may include a body portion (110).

[0046] The body portion (110) may include an upper plate (112) forming the upper surface of the first body (100), and a first side plate (114) extending downward in the optical axis direction from the edge of the upper plate (112) to form a side surface of the first body (100). For example, the body portion (110) may have a rectangular cross-sectional shape. An internal space may be formed within the body portion (110) that is partitioned from other regions by the lower surface of the upper plate (112) and the inner surface of the first side plate (114).

[0047] A barrel portion (140) protruding upward and having a lens module (300) coupled to the inside thereof may be formed on the body portion (110). The barrel portion (140) may have a circular cross-section. A hollow portion (142) may be formed on the inside of the barrel portion (140) so that at least a portion of the lens module (300) may be coupled thereto. The hollow portion (142) may be in communication with the internal space of the body portion (110).

[0048] A first guide (130) may be arranged on the lower surface of the body portion (110). The first guide (130) may have a shape that protrudes downward from the lower surface of the upper plate (112) or the lower surface of the first side plate (114). The lower surface of the first guide (130) may be in contact with the upper surface of the substrate (400). The lower surface of the first guide (130) may be arranged closer to the substrate (400) than the lower surface of the first side plate (114).

[0049] The first body (100) may be formed of a metal material. For example, the material of the first body (100) may be aluminum. The first body (100) may be formed by a forging method.

[0050] The second body (200) can form the outer shape of the camera module (10) by combining with the first body (100). The second body (200) can be named any one of a rear body, a lower housing, a second housing, and a rear cover. Based on the optical path, the second body (200) can be placed at the rear of the first body (100). The second body (200) can include a lower plate (212) forming the lower surface of the second body (200), and a second side plate (214) extending upward in the optical axis direction from the edge of the lower plate (212) to form a side surface of the second body (200). The second body (200) can have a rectangular cross-sectional shape to correspond to the cross-sectional shape of the body portion (110). Within the second body (200), a space (202) can be formed that is separated from other areas by the upper surface of the lower plate (212) and the inner surface of the second side plate (214).

[0051] The second side plate (214) may be arranged so that its upper surface faces the lower surface of the first side plate (114) in the direction of the optical axis. The upper surface of the second side plate (214) may be spaced apart from the lower surface of the first side plate (114) by a predetermined distance in the direction of the optical axis. The second side plate (214) may be arranged on the outer side of the first guide (130). The outer surface of the first guide (130) and the inner surface of the second side plate (214) may be spaced apart from each other in a direction perpendicular to the optical axis. The side surface of the substrate (400) and the inner surface of the second side plate (214) may also be spaced apart from each other in a direction perpendicular to the optical axis. Based on the direction perpendicular to the optical axis, the distance between the outer surface of the first guide (130) and the inner surface of the second side plate (214) may be shorter than the distance between the side surface of the substrate (400) and the inner surface of the second side plate (214).

[0052] The optical axis direction length (H) from the upper surface of the substrate (400) to the upper surface of the second side plate (214) may be 20% or more of the thickness of the substrate (400). For example, the optical axis direction length (H) from the upper surface of the substrate (400) to the upper surface of the second side plate (214) may be 0.2 mm or more. Accordingly, since the substrate (400) can be spaced apart from the formation area of ​​the welded portion (500) to be described later in the optical axis direction, heat generated during the formation of the welded portion (500) can be minimized from being transferred to the substrate (400).

[0053] A connector lead-out portion (250) having a shape that protrudes downward may be arranged on the lower surface of the second body (200). The connector lead-out portion (250) may have a pipe shape that includes a space in which a connector (490) to be described later is coupled. An external terminal may be coupled to the connector lead-out portion (250), and accordingly, by coupling the external terminal and the connector (490), power may be supplied to the camera module (10) or an electrical signal related to driving may be transmitted and received.

[0054] The second body (200) may include a second guide (230). The second guide (230) may have a shape that protrudes upward from the upper surface of the lower plate (212). The second guide (230) may have a shape that protrudes inward from the inner surface of the second side plate (214). The second guide (230) may be arranged so that at least a portion thereof overlaps the first guide (130) in the optical axis direction. The upper surface of the second guide (230) may be in contact with the lower surface of the substrate (400). Based on the optical axis direction, the upper surface of the second side plate (214) may be arranged closer to the upper plate (112) than the upper surface of the second guide (230).

[0055] The substrate (400) can be firmly fixed in position within the space of the camera module (10) as its upper and lower surfaces are supported by the lower surface of the first guide (130) and the upper surface of the second guide (230), respectively. The area of ​​the upper and lower surfaces of the substrate (400) that comes into contact with the lower surface of the first guide (130) and the upper surface of the second guide (230) can be a grounding area of ​​the ground power supply.

[0056] The second body (200) may be formed of a metal material. For example, the material of the second body (200) may be aluminum. The second body (200) may be formed by a forging method.

[0057] A lens module (300) can be coupled to the first body (100). At least a portion of the lens module (300) can be coupled to the barrel portion (140) of the first body (100), and the other portion can be arranged to protrude upward from the barrel portion (140). The lens module (300) can include a barrel and one or more lenses (310) arranged within the barrel. The lenses (310) can be arranged to face the image sensor (410) of the substrate (400) in the optical axis direction. The lenses (310) can be aligned with the image sensor (410) along the optical axis. A plurality of lenses (310) can be provided and arranged along the optical axis direction. The outermost lens among the plurality of lenses (310) can be exposed upward from the barrel.

[0058] A flange (330) having a shape that protrudes outwardly perpendicular to the optical axis direction more than other areas may be formed on the outer surface of the barrel. The area where the flange (330) is formed may have a larger cross-sectional area than other areas within the barrel. When the lens module (300) and the first body (100) are coupled, the flange (330) may be placed on the barrel portion (140). A sealing member (not shown) may be placed between the flange (330) and the barrel portion (140) to prevent external foreign substances from entering the space within the camera module (10).

[0059] The substrate (400) may be placed in a space within the camera module (10). The substrate (400) may be a printed circuit board (PCB). The substrate (400) may be formed in a plate shape having a predetermined thickness based on the optical axis direction (X).

[0060] One or more electronic components for driving the camera module (10) may be arranged on the surface of the substrate (400). For example, an image sensor (410) may be arranged on the upper surface of the substrate (400), and the image sensor (410) may be arranged to face the lens (310) in the optical axis direction. A connector (490) may be mounted on the lower surface of the substrate (400), and the camera module (10) may be electrically connected to an external terminal through the connector (490).

[0061] Below, the coupling structure between the first body (100) and the second body (200) will be described.

[0062] According to the present embodiment, the camera module (10) can be connected by welding the first body (100) and the second body (200). For example, the first body (100) and the second body (200) can be connected by laser welding. The first body (100) and the second body (200) can be connected to each other by welding between the lower surface of the first body (100) and the upper surface of the second body (200), which are arranged to face each other in the optical axis direction. Accordingly, since parts such as screws for fastening the first body (100) and the second body (200) or sealing members for waterproofing are omitted, there is an advantage in that the manufacturing cost can be reduced.

[0063] In detail, as illustrated in FIG. 4, a weld (500) may be placed between the first body (100) and the second body (200). The weld (500) may be an area where the first body (100) and the second body (200) are joined by welding. The weld (500) may be placed between the first side plate (114) and the second side plate (214).

[0064] The welded portion (500) may include a first region (510) disposed between the first side plate (114) and the second side plate (214), and a second region (520) connected to the first region (510) and covering the outer surface of the first side plate (114) and the outer surface of the second side plate (214) in the optical axis direction. Between the lower surface of the first side plate (114) and the upper surface of the second side plate (214), a region where the first region (510) is disposed and a region where the first region (510) is not disposed may be formed. In this case, the lower surface of the first side plate (114) and the upper surface of the second side plate (214) may be spaced apart from each other in the optical axis direction in the region where the first region (510) is not disposed.

[0065] The second region (520) is arranged on the outside of the first region (510) and may be arranged to cover the outer surface of the first side plate (114) and the outer surface of the second side plate (214). However, this is not limited thereto, and the second region (520) may be arranged to cover only one of the outer surfaces of the first side plate (114) and the outer surface of the second side plate (214).

[0066] With respect to the first direction (X) which is the optical axis direction, the length of the second region (520) may be formed to be longer than the length of the first region (510). With respect to the second direction (Y) which is perpendicular to the optical axis direction, the length (L2) of the first region (510) may be formed to be longer than the length of the second region (520). The thickness (t) of the first region (510) defined in the optical axis direction may be 0.1 mm to 0.3 mm. The length (L2) of the first region (510) in the second direction (Y) may be 0.3 to 0.5 of the second direction length (L1) of the second side plate (214). The thickness of the second side plate (214), that is, the second direction length (L1) of the second side plate (214), may be 0.6 to 1.0 mm. For example, the second direction length (L1) of the second side plate (214) may be 0.8 mm.

[0067] Based on the direction perpendicular to the optical axis, the sum (L3) of the thicknesses of the first side plate (114) and the first guide (130) may be at least twice the thickness (L1) of the second side plate (214). Accordingly, a sufficient distance between the first guide (130) and the second side plate (214) in the direction perpendicular to the optical axis may be secured, thereby minimizing heat transfer to the substrate (400) during the formation of the welded portion (500). The sum (L3) of the thicknesses of the first side plate (114) and the first guide (130) may be at least 1.6 mm.

[0068] Heat generated during the welding process between the first body (100) and the second body (200) may be transferred to the space within the camera module (10), and in this case, damage may occur to the substrate (400).

[0069] To prevent this, the camera module (10) may be formed with an air gap (600) that separates the side surface of the substrate (400) and the welding portion (500). In detail, the air gap (600) may include a first air gap (610) formed between the lower surface of the first side plate (114) and the upper surface of the second side plate (214), a second air gap (620) formed between the outer surface of the first guide (130) and the inner surface of the second side plate (214), and a third air gap (630) disposed below the second air gap (620) and formed between the side surface of the substrate (400) and the inner surface of the second side plate (214). The first to third air gaps (610, 620, 630) may be interconnected.

[0070] The first air gap (610) may be a region that separates the lower surface of the first side plate (114) and the upper surface of the second side plate (214) in the optical axis direction. The first air gap (610) may be arranged on the inner side of the first region (510) of the welded portion (500). The first air gap (610) may be arranged to overlap the first region (510) in a direction perpendicular to the optical axis direction.

[0071] The second air gap (620) may be a region that separates the outer surface of the first guide (130) and the inner surface of the second side plate (214) in a direction perpendicular to the optical axis. For example, the length of the second air gap (620) may be 0.05 mm to 0.25 mm based on the direction perpendicular to the optical axis. When the length of the second air gap (620) is 0.05 mm or less, the separation distance is insufficient, making it difficult to sufficiently implement a structure that prevents heat transfer to the substrate (400). In addition, when the length of the second air gap (620) exceeds 0.25 mm, there is a problem that the space within the camera module (10) excessively increases.

[0072] The third air gap (630) may be a region that separates the side surface of the substrate (400) and the inner surface of the second side plate (214) in a direction perpendicular to the optical axis. The length of the third air gap (630) in the direction perpendicular to the optical axis may be formed to be longer than the length of the second air gap (620). The length of the third air gap (630) in the direction perpendicular to the optical axis may be 0.4 mm or more and 0.6 mm or less.

[0073] Meanwhile, as illustrated in FIG. 4, a chamfered surface (132) is formed at the lower end of the outer surface of the first guide (130), which is the connection area between the second air gap (620) and the third air gap (630), so that the length in the direction perpendicular to the optical axis can increase from the second air gap (620) to the third air gap (630).

[0074] There is an advantage in that the heat generated during the bonding process of the front housing and the rear housing through the air gap (600) according to the structure described above can be prevented from being transferred to the substrate (400).

[0075] FIG. 5 is a drawing dividing a joining area of ​​a first body and a second body by location according to an embodiment of the present invention, FIG. 6 is a drawing photographing crystal particles in a joining area of ​​a first body and a second body according to an embodiment of the present invention, and FIGS. 7 to 9 are drawings for explaining the difference in size of crystal particles by area divided in FIGS. 5 and 6.

[0076] Referring to FIG. 5, the joint region of the first body (100) and the second body (200), which is the arrangement region of the welded portion (500), can be divided into an upper region (720), a central region (710), and a lower region (730) based on the optical axis direction. Based on the central region (710), the upper region (720) and the lower region (730) can be arranged to face each other in the optical axis direction. The upper region (720), the central region (710), and the lower region (730) can each be a formation region of the welded portion (500). The upper region (720) can be a region where at least a portion overlaps the first side plate (114) in a direction perpendicular to the optical axis direction. The lower region (730) can be a region where at least a portion overlaps the second side plate (214) in a direction perpendicular to the optical axis direction. The central region (710) may be a region that overlaps at least partly with the region between the first side plate (114) and the second side plate (214) in a direction perpendicular to the optical axis.

[0077] Referring to FIG. 6 and FIG. 7, it can be confirmed that the size of the crystal grains constituting the upper region (720) has a distribution of 34.9 um or more and 278.2 um or less, and the average size of the crystal grains is 77.4 um.

[0078] Referring to FIG. 6 and FIG. 8, it can be confirmed that the size of the crystal grains constituting the central region (710) has a distribution of 32.9 um or more and 205.3 um or less, and the average size of the crystal grains is 67.9 um.

[0079] Referring to FIG. 6 and FIG. 9, it can be confirmed that the crystal grains constituting the lower region (730) have a size distribution of 18.0 um or more and 130.3 um or less, and the average size of the crystal grains is 38.1 um.

[0080] Accordingly, it can be confirmed that the average size of the crystal grains forming the central region (710) based on the formation region of the welded portion (500) of the camera module (10) according to the embodiment is larger than the average size of the crystal grains forming the lower region (730) and smaller than the average size of the crystal grains forming the upper region (720).

[0081] Additionally, it can be confirmed that the average size of the crystal grains constituting the upper region (710) is more than twice the average size of the crystal grains constituting the lower region (730).

[0082] Based on the direction perpendicular to the optical axis, the thickness of the second side plate (214) is smaller than the thickness of the first side plate (114), so the formation area of ​​the welded portion (500) is a structure in which the strength becomes weaker as it goes from the upper area (720) to the lower area (730). Therefore, according to the present embodiment, by implementing a crystal structure in which the average size of crystal grains becomes smaller as it goes from the upper area (720) to the lower area (730), there is an advantage in that the tensile strength and toughness can be increased in the area with a small thickness.

[0083] In particular, as described above, since the sum of the thicknesses (L3) of the first side plate (114) and the first guide (130) is more than twice the thickness (L1) of the second side plate (214), the average size of the crystal grains constituting the lower region (730) can be formed to be less than half the average size of the crystal grains constituting the upper region (710), thereby reinforcing the weak strength in the formation area of ​​the weld (500) in the second body (200) compared to the first body (100).

[0084] FIG. 10 is a drawing dividing the joining area of ​​the first body and the second body by location according to an embodiment of the present invention, and FIGS. 11 to 13 are drawings for explaining the difference in the size of crystal particles by area divided in FIG. 10.

[0085] In Fig. 10, unlike in Fig. 5, the formation area of ​​the weld (500) is partitioned in a direction perpendicular to the optical axis direction. In detail, the joint area of ​​the first body (100) and the second body (200), which is the arrangement area of ​​the weld (500), can be partitioned into an outer area (810), an inner area (830), and a connection area (820) disposed between the outer area (810) and the inner area (830), based on the direction perpendicular to the optical axis direction. The outer surface of the outer area (810) can form the outer surface of the camera module (10). The inner area (830) can include a plurality of areas spaced apart in the optical axis direction based on the air gap (610). The connection area (820) connects the outer area (810) and the inner area (830), and can include a plurality of areas in which some are connected in the optical axis direction and other parts are spaced apart in the optical axis direction based on the air gap (610). Based on the direction perpendicular to the optical axis, the width of the connection region (820) may be greater than the widths of the inner region (830) and the outer region (810). Based on the direction perpendicular to the optical axis, the width of the inner region (830) may be greater than the width of the outer region (810).

[0086] Referring to Fig. 11, it can be confirmed that the size of the crystal grains constituting the outer region (810) has a distribution of 15.1 um or more and 61.4 um or less, and the average size of the crystal grains is 30.9 um.

[0087] Referring to Fig. 12, it can be confirmed that the size of the crystal grains forming the connection area (820) has a distribution of 15.8 um or more and 141.8 um or less, and the average size of the crystal grains is 40.7 um.

[0088] Referring to Fig. 13, it can be confirmed that the size of the crystal grains constituting the inner region (830) has a distribution of 14.7 um or more and 94.4 um or less, and the average size of the crystal grains is 25.7 um.

[0089] Accordingly, it can be confirmed that the average size of the crystal grains constituting the outer region (810) based on the formation area of ​​the welded portion (500) in the camera module (10) according to the embodiment is larger than the average size of the crystal grains constituting the inner region (830) and smaller than the average size of the crystal grains constituting the connection region (820). Therefore, the strength can be reinforced by forming the average size of the crystal grains of the inner region (830), which includes a plurality of regions separated based on the air gap (600), to be smaller than the average sizes of the crystal grains of the outer region (810) and the connection region (820). In addition, by implementing the crystal grains of the outer region (810) arranged on the surface of the camera module (10) to have a denser structure than the crystal grains of the connection region (820), the tensile strength and toughness in the region closest to the welded portion (500) can be increased.

[0090] Although all components constituting the embodiments of the present invention have been described above as being combined or operating in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the purpose of the present invention, all components may be selectively combined and operated one or more times. In addition, terms such as "include," "comprise," or "have" described above, unless specifically stated to the contrary, mean that the corresponding component may be inherent, and therefore should be interpreted as including other components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related technology, and shall not be interpreted in an ideal or excessively formal sense, unless explicitly defined in the present invention.

[0091] The above description is merely an illustrative description of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. A first body including a first side plate; A second body including a second side plate facing the first side plate in the optical axis direction; and Including a welded portion at least partially disposed between the first side plate and the second side plate, The formation area of the above welded portion includes an upper area, a central area, and a lower area based on the optical axis direction, The upper region overlaps at least partly with the first body in a direction perpendicular to the optical axis, The above lower region overlaps at least partly with the second body in a direction perpendicular to the optical axis, A camera module in which the average sizes of the crystal grains constituting each of the upper region, the central region, and the lower region are different from each other.

2. In paragraph 1, A camera module wherein the average size of the crystal grains constituting the lower region is smaller than the average size of the crystal grains constituting the upper region and the average size of the crystal grains constituting the central region.

3. In paragraph 2, A camera module wherein the average size of the crystal grains constituting the central region is smaller than the average size of the crystal grains constituting the upper region.

4. In paragraph 2, A camera module in which the thickness of the first side plate is thicker than the thickness of the second side plate, based on a direction perpendicular to the optical axis.

5. In paragraph 4, The first body includes a first guide that overlaps at least a portion of the second side plate in a direction perpendicular to the optical axis, A camera module wherein the sum of the thicknesses of the first guide and the first side plate is at least twice the thickness of the second side plate.

6. In paragraph 5, A camera module in which the average size of the crystal grains forming the upper region is at least twice the average size of the crystal grains forming the lower region.

7. In paragraph 1, Based on the direction perpendicular to the optical axis, the joining region of the first body and the second body includes an outer region, a connection region arranged on the inner side of the outer region, and an inner region arranged on the inner side of the connection region. A camera module in which the average size of the crystal grains constituting each of the outer region, the connection region, and the inner region is different.

8. In paragraph 7, A camera module wherein the average size of the crystal grains constituting the inner region is smaller than the average size of the crystal grains constituting the outer region and the average size of the crystal grains constituting the connection region.

9. In paragraph 8, A camera module in which the inner region includes a plurality of regions divided based on the optical axis-wise separation region between the first side plate and the second side plate.

10. In paragraph 1, A camera module wherein the average size of the crystal grains constituting the outer region is smaller than the average size of the crystal grains constituting the connection region.

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