KR102529998B1 - Printed circuit board, lens driving unit and camera module including the same - Google Patents

Abstract

One embodiment of the printed circuit board, in the printed circuit board, a terminal surface formed on the printed circuit board; a plurality of terminals formed on a surface of the terminal surface; and a coating layer formed on the terminal surface and a surface of the terminal to cover a portion of the terminal surface and the surface of the terminal, wherein a length of a boundary line formed between the coating layer formed on the surface of the terminal and the terminal is It may be formed longer than the length of the terminal in the width direction.

Description

Printed circuit board, lens driving device and camera module including the same {Printed circuit board, lens driving unit and camera module including the same}

The embodiment relates to a printed circuit board, a lens driving device including the same, and a camera module.

The contents described in this part merely provide background information on the embodiments and do not constitute prior art.

In recent years, the development of IT products such as mobile phones, smart phones, tablet PCs, laptops, etc., in which a subminiature camera module is built in, has been actively progressed.

The camera module includes a lens driving device, and a printed circuit board is provided as a component of the lens driving device. Terminals for electrical connection with external devices may be formed on the printed circuit board.

In addition, various elements and circuit patterns electrically connected to the terminals may be formed on the printed circuit board. If the camera module is dropped or subjected to external impact, stress may occur in terminals formed on the printed circuit board.

Such stress may cause cracks to occur in terminals. In addition, when the camera module is repeatedly subjected to external impact, stress is further accumulated, and accordingly, when the number and size of cracks increase, a disconnection phenomenon in which terminals are disconnected may occur.

Since disconnection of these terminals may cause malfunctions of the printed circuit board, the lens driving device, and the camera module, improvement is required.

Accordingly, the embodiment relates to a printed circuit board capable of suppressing cracks in terminals and preventing disconnection of terminals, and a lens driving device and a camera module including the printed circuit board.

The technical problem to be achieved by the embodiment is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

One embodiment of the printed circuit board, in the printed circuit board, a terminal surface formed on the printed circuit board; a plurality of terminals formed on a surface of the terminal surface; and a coating layer formed on the terminal surface and a surface of the terminal to cover a portion of the terminal surface and the surface of the terminal, wherein a length of a boundary line formed between the coating layer formed on the surface of the terminal and the terminal is It may be formed longer than the length of the terminal in the width direction.

At least one terminal surface protrudes in the lateral direction of the printed circuit board, a plurality of terminals are printed on the terminal surface at set intervals, and the coating layer surrounds each terminal, but a part of the surface of the terminal is printed. It may be formed to be exposed.

The boundary line between the coating layer and the terminal may be formed in at least one of a linear shape having a bending point, a triangular shape, a round shape, an arc shape, a semicircular shape, and a wavy shape.

A boundary line between the coating layer and the terminal may have a width of 0.03 mm to 0.07 mm in a longitudinal direction of the terminal.

The coating layer may be formed of photo solder resist ink or a polyimide material.

In one embodiment of the printed circuit board, a conductive layer electrically connected to the terminal may be formed on a lower surface of the terminal.

The conductive layer may be formed in a plate shape made of copper or copper alloy, and may be formed in the same number as the plurality of terminals.

One embodiment of the printed circuit board, the terminal surface; the conductive layer disposed on an upper surface of the terminal surface; the terminal disposed on an upper surface of the conductive layer; and a coating layer having a portion disposed on an upper surface of the terminal so that a portion of the upper surface of the terminal is exposed, and the terminal surface, the conductive layer, and the terminal may be electrically connected.

In an embodiment of the printed circuit board, at least one via formed through the conductive layer and the terminal and electrically connecting the conductive layer and the terminal may be provided.

One embodiment of the printed circuit board, the terminal surface; the conductive layer disposed on an upper surface of the terminal surface; the terminal disposed on an upper surface of the conductive layer; and a coating layer having a portion disposed on the upper surface of the terminal so that a portion of the upper surface of the terminal is exposed. The via may be formed to penetrate the conductive layer and the terminal, and the via may electrically connect the terminal surface, the conductive layer, and the terminal.

One embodiment of the lens driving device may include the above-described printed circuit board.

One embodiment of the camera module may include the lens driving device described above.

In an embodiment, the printed circuit board may suppress cracks due to concentration of stress by extending the length of the boundary line formed between the coating layer and the terminal to widely distribute stress generated along the boundary line.

In addition, the printed circuit board has an effect of maintaining an electrical connection between the printed circuit board and the terminal even if the terminal is disconnected due to stress generated at the boundary line by having a conductive layer.

In addition, the printed circuit board has an effect of maintaining electrical connection between the printed circuit board and the terminal even if the terminal is disconnected due to the stress generated at the boundary line by providing the via.

1 is a perspective view showing a part of a lens driving device including a printed circuit board according to an embodiment.
2 and 3 are exploded perspective views illustrating parts of a lens driving device including a printed circuit board according to an exemplary embodiment.
4 is a plan view illustrating a printed circuit board according to an exemplary embodiment.
FIG. 5 is a view showing part A of FIG. 4 .
6 is a view showing a printed circuit board according to another embodiment.
7 is a view showing a printed circuit board according to another embodiment.
8 is a side view showing a state of FIG. 7 viewed in a B direction.
9 is a view showing a printed circuit board according to another embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Embodiments can apply various changes and can have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiments to a specific form disclosed, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the embodiments. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description.

Terms such as "first" and "second" may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. In addition, terms specifically defined in consideration of the configuration and operation of the embodiment are only for describing the embodiment, and do not limit the scope of the embodiment.

In the description of the embodiment, in the case where it is described as being formed on "upper (above)" or "lower (on or under)" of each element, on or under (on or under) ) includes both elements formed by directly contacting each other or by indirectly placing one or more other elements between the two elements. In addition, when expressed as “up (up)” or “down (down) (on or under)”, it may include the meaning of not only the upward direction but also the downward direction based on one element.

In addition, relational terms such as "upper/upper/upper" and "lower/lower/lower" used below do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It may be used only to distinguish one entity or element from another entity or element.

In addition, an orthogonal coordinate system (x, y, z) can be used in the drawing. In the drawing, the x-axis and the y-axis mean axes perpendicular to the optical axis, and for convenience, the optical axis direction (z-axis direction) may be referred to as a first direction, an x-axis direction as a second direction, and a y-axis direction as a third direction.

1 is a perspective view showing a part of a lens driving device including a printed circuit board according to an embodiment. 2 is an exploded perspective view illustrating a part of a lens driving device including a printed circuit board according to an exemplary embodiment.

An image stabilization device applied to a small camera module of a mobile device such as a smartphone or tablet PC is designed to prevent the outline of a captured image from being formed clearly due to vibration caused by the user's hand shake when capturing a still image. means a configured device. In addition, the auto focusing device is a device that automatically focuses an image of a subject on an image sensor (not shown) surface.

Such an image stabilization device and an auto-focusing device can be configured in various ways. In the case of an embodiment, an optical module composed of a plurality of lenses is moved in a first direction or moved in a direction perpendicular to the first direction to compensate for such hand shake. operation and/or an auto focusing operation may be performed.

As shown in FIG. 2 , the lens driving device according to the embodiment may include a movable part. At this time, the movable unit may perform functions of auto focusing of the lens and hand shake correction. The movable unit may include the bobbin 110, the first coil 120, the first magnet 130, the housing 140, the upper elastic member 150, and the lower elastic member 160.

The bobbin 110 has a first coil 120 disposed inside the first magnet 130 on an outer circumferential surface thereof, and the first coil 120 is provided for electromagnetic interaction between the first magnet 130 and the first coil 120. It may be installed in the inner space of the housing 140 to be reciprocally movable in the first direction. A first coil 120 is installed on the outer circumferential surface of the bobbin 110 to enable electromagnetic interaction with the first magnet 130 .

In addition, the bobbin 110 is elastically supported by the upper and lower elastic members 150 and 160 and moves in a first direction to perform an auto focusing function.

The bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel may be coupled to the inside of the bobbin 110 in various ways.

For example, a female screw thread may be formed on an inner circumferential surface of the bobbin 110 and a male screw thread corresponding to the screw thread may be formed on an outer circumferential surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing of the female screw thread. However, this is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screw coupling without forming a thread on the inner circumferential surface of the bobbin 110 . Alternatively, the one or more lenses may be integrally formed with the bobbin 110 without a lens barrel.

The lens coupled to the lens barrel may be composed of one sheet, or two or more lenses may form an optical system.

The auto focusing function is controlled according to the direction of the current, and the auto focusing function may be implemented by moving the bobbin 110 in the first direction. For example, when a forward current is applied, the bobbin 110 may move upward from an initial position, and when a reverse current is applied, the bobbin 110 may move downward from an initial position. Alternatively, the moving distance in one direction from the initial position may be increased or decreased by adjusting the amount of one-way current.

A plurality of upper support protrusions and lower support protrusions may protrude from the upper and lower surfaces of the bobbin 110 . The upper support protrusion may be provided in a cylindrical shape or a prismatic shape, and may couple and fix the upper elastic member 150 . The lower support protrusion may be provided in a cylindrical shape or a prismatic shape like the upper support protrusion described above, and may couple and fix the lower elastic member 160 .

In this case, a through hole corresponding to the upper support protrusion may be formed in the upper elastic member 150 , and a through hole corresponding to the lower support protrusion may be formed in the lower elastic member 160 . Each of the support protrusions and the through holes may be fixedly coupled by thermal fusion or an adhesive such as epoxy.

The housing 140 may have a hollow pillar shape supporting the first magnet 130 and may be formed in a substantially rectangular shape. The first magnet 130 and the support member 220 may be coupled to each other and disposed on the side surface of the housing 140 .

In addition, as described above, the bobbin 110 guided by the elastic members 150 and 160 and moving in the first direction may be disposed inside the housing 140 . In the embodiment, the first magnet 130 may be disposed at a corner of the housing 140, and the support member 220 may be disposed at a side surface of the housing 140.

The upper elastic member 150 and the lower elastic member 160 may elastically support the upward and/or downward movement of the bobbin 110 in the first direction. The upper elastic member 150 and the lower elastic member 160 may be provided as leaf springs.

As shown in FIG. 2 , the upper elastic member 150 may be provided in two pieces separated from each other. Through this two-part structure, the divided parts of the upper elastic member 150 may receive currents of different polarities or different power sources. Also, as a modified embodiment, the lower elastic member 160 may have a two-part structure and the upper elastic member 150 may have an integral structure.

Meanwhile, the upper elastic member 150, the lower elastic member 160, the bobbin 110, and the housing 140 may be assembled through thermal fusion and/or bonding using an adhesive. At this time, for example, the fixing operation may be completed by bonding using an adhesive after heat fusion fixation.

The base 210 is disposed below the bobbin 110 and may be provided in a substantially rectangular shape, the printed circuit board 250 may be seated, and the lower side of the support member 220 may be fixed. In addition, a support member 220 seating groove 214 into which the support member 220 can be inserted may be formed concavely on the upper surface of the base 210 . An adhesive is applied to the seating groove 214 of the support member 220 to fix the support member 220 so as not to move.

A support groove having a corresponding size may be formed on a surface of the base 210 facing the portion where the terminal surface 253 of the printed circuit board 250 is formed. This support groove is formed concavely inward from the outer circumferential surface of the base 210 to a certain depth, so that the portion where the terminal surface 253 is formed does not protrude outward or the amount of protrusion can be adjusted.

The support member 220 is disposed on the side of the housing 140, has an upper side coupled to the housing 140 and a lower side coupled to the base 210, and the bobbin 110 and the housing 140 are It can be supported to be movable in the second and third directions perpendicular to the first direction, and can also be electrically connected to the first coil 120 .

Since each of the support members 220 according to the embodiment is disposed on the rectangular outer surface of the housing 140, a total of four may be installed symmetrically with each other. However, it is not limited to this, and it is also possible to consist of eight, two for each straight plane. Also, the support member 220 may be electrically connected to the upper elastic member 150 or electrically connected to a straight surface of the upper elastic member 150 .

In addition, since the support member 220 is formed as a separate member from the upper elastic member 150, the support member 220 and the upper elastic member 150 may be electrically connected through conductive adhesive or solder. Accordingly, the upper elastic member 150 may apply current to the first coil 120 through the electrically connected support member 220 .

Meanwhile, in FIG. 2 , the plate-shaped support member 220 is illustrated as an embodiment, but is not limited thereto. That is, the support member may be provided in the form of a wire.

The second coil 230 may perform hand shake correction by moving the housing 140 in the second and/or third directions through electromagnetic interaction with the first magnet 130 .

Here, the second and third directions may include directions substantially close to the x-axis and y-axis directions as well as the x-axis and y-axis directions. That is, when viewed from the driving side of the embodiment, the housing 140 may move parallel to the x-axis and y-axis, but may also move slightly inclined to the x-axis and y-axis when moving while being supported by the support member 220 there is.

In addition, the first magnet 130 needs to be installed at a position corresponding to the second coil 230.

The second coil 230 may be disposed to face the first magnet 130 fixed to the housing 140 . In one embodiment, the second coil 230 may be disposed outside the first magnet 130 . Alternatively, the second coil 230 may be installed on the lower side of the first magnet 130 at a predetermined distance apart.

According to the embodiment, a total of four second coils 230 may be installed at four corners of the circuit member 231, but is not limited thereto, one for the second direction and one for the third direction. It is possible that only two lights are installed, and four or more lights may be installed.

In the case of the embodiment, a circuit pattern is formed on the circuit member 231 in the shape of the second coil 230, and an additional second coil may be disposed above the circuit member 231, but is not limited thereto, and the circuit pattern is not limited thereto. Without forming a circuit pattern in the shape of the second coil 230 on the member 231 , only a separate second coil 230 may be disposed above the circuit member 231 .

Alternatively, it is also possible to configure the second coil 230 by winding a wire in a donut shape or to form the second coil 230 in an FP coil shape and electrically connect it to the printed circuit board 250.

The second coil 230 may be disposed above the base 210 and below the housing 140 . At this time, the circuit member 231 including the second coil 230 may be installed on the upper surface of the printed circuit board 250 disposed above the base 210 .

However, it is not limited thereto, and the second coil 230 may be disposed in close contact with the base 210 or may be disposed apart from each other by a certain distance, and may be formed on a separate substrate to attach the substrate to the printed circuit board 250. Stacked connections are also possible.

The printed circuit board 250 is coupled to the upper surface of the base 210, and as shown in FIG. 2, a through hole or groove is formed at a corresponding position so that the support member 220 seating groove 214 can be exposed. can be formed

A bent terminal surface 253 on which the terminal 251 is installed may be formed on the printed circuit board 250 . In the embodiment, a printed circuit board 250 having two bent terminal faces 253 is shown. A plurality of terminals 251 are disposed on the terminal surface 253 to receive external power and supply current to the first coil 120 and the second coil. The number of terminals formed on the terminal surface 253 may be increased or decreased according to the types of components that need to be controlled. Also, the printed circuit board 250 may include one or more than three terminal surfaces 253 .

Various elements and circuit patterns electrically connected to the terminal 251 may be formed on the printed circuit board 250 . In addition, the printed circuit board 250 has a plurality of layers stacked to form elements and circuit patterns, and the layers may be electrically connected to each other.

Elements and circuit patterns may independently exist in each layer, or elements and circuit patterns performing specific functions may be formed by stacking each layer.

In addition, the terminal surface 253 is also a part of the printed circuit board 250 . Accordingly, the terminal surface may also be formed by stacking a plurality of layers, or may be formed in one layer.

The cover member 300 may be provided in a substantially box shape, accommodate the movable part, the second coil 230, and a part of the printed circuit board 250, and may be combined with the base 210. The cover member 300 protects the movable part, the second coil 230, the printed circuit board 250, etc. accommodated therein from being damaged, and in particular, the first magnet 130, the first The leakage of the electromagnetic field generated by the coil 120, the second coil 230, and the like to the outside can be restricted so that the electromagnetic field can be focused.

3 is an exploded perspective view illustrating a part of a lens driving device including a printed circuit board according to an exemplary embodiment. As shown in FIG. 3 , the lens driving device of the embodiment may further include a first holder 600 and a substrate 800 . The first holder 600 may be disposed under the base 210, and the filter 610 may be mounted thereon.

The filter 610 may serve to block light of a specific frequency band from light passing through the lens barrel from being incident to the image sensor 810 to be described later. At this time, it is appropriate that the filter 610 is provided to lie on the x-y plane.

In addition, the filter 610 may be coupled to the upper surface of the first holder 600, and in one embodiment, the filter 610 may be an infrared cut-off filter. In addition, a hollow may be formed in a portion of the first holder 600 where the filter 610 is mounted so that light passing through the filter 610 may be incident to the image sensor 810 .

The base 210 and the first holder 600 may be coupled to each other by an adhesive. At this time, the adhesives used include, for example, epoxy, thermosetting adhesives, ultraviolet curable adhesives, and the like.

A substrate 800 may be disposed below the first holder 600 and an image sensor 810 may be mounted thereon. The image sensor 810 is a part where light passing through the filter 610 is incident and an image including the light is formed.

At this time, it is appropriate that the image sensor 810 is provided to lie on the x-y plane. In one embodiment, the image sensor 810 may be mounted on an upper surface of the first holder 600 .

The substrate 800 may be provided with various circuits, elements, controllers, etc. to convert an image formed by the image sensor 810 into an electrical signal and transmit it to an external device.

The substrate 800 can be combined with the first holder 600, and like the case of the base 210 and the first holder 600, they can be fixedly coupled to each other by bonding using an adhesive. Meanwhile, the substrate 800 may be formed of a circuit board on which the image sensor 810 is mounted, a circuit pattern is formed, and various elements are coupled.

Also, the board 800 may be electrically connected to the printed circuit board 250 . Accordingly, the printed circuit board 250 can receive current required for driving the lens driving device from the board 800, and the printed circuit board 250 and the board 800 can exchange electrical signals with each other.

Specifically, when the lens driving device is assembled, the terminal 251 provided on the printed circuit board 250 and the soldering part 820 provided on the board 800, as shown in FIG. They may be arranged at positions corresponding to each other.

Therefore, the plurality of terminals 251 and the soldering unit 820 may be coupled to each other by soldering, and accordingly, the printed circuit board 250 and the board 800 are electrically connected to each other. can be connected

4 is a plan view illustrating a printed circuit board 250 according to an exemplary embodiment. FIG. 5 is a view showing part A of FIG. 4 . The printed circuit board 250 may include a terminal surface 253 , a terminal 251 , and a coating layer 252 .

The terminal surface 253 is formed to be bendable on the side surface of the printed circuit board 250 and may be provided for electrical connection with an external device. At this time, the external device may be, for example, the substrate 800 .

That is, as described above, the terminal 251 formed on the terminal surface 253 and the soldering part 820 formed on the substrate 800 may be coupled and electrically connected by soldering or the like, and thus the printed circuit board 820 may be electrically connected. The circuit board 250 and the board 800 may be electrically connected.

Meanwhile, as shown in FIG. 4 , at least one terminal surface 253 may protrude in a lateral direction of the printed circuit board 250 and may be formed of a flexible material. To this end, the entire printed circuit board 250 integrally formed with the terminal surface 253 may be formed of a flexible material.

Accordingly, the terminal surface 253 may be formed on a side surface of the printed circuit board 250 in a direction parallel to the printed circuit board 250 . When assembling the lens driving device, the terminal surface 253 made of a flexible material may be bent downward at an angle of about 90° and coupled to the side surface of the base 210 by bonding or the like.

A plurality of terminals 251 may be formed on the surface of the terminal surface 253 . That is, a plurality of terminals 251 may be formed on the surface of the terminal surface 253 at set intervals by a printing technique, a nickname technique, or the like.

At this time, the number of the plurality of terminals 251 may be appropriately selected according to the structure of the printed circuit board 250, the lens driving device and the board 800 connected to the printed circuit, and the electrical connection structure therebetween. In addition, when the number of terminal surfaces 253 is provided in two or more, the number of terminals 251 formed on each terminal surface 253 does not necessarily need to match.

The coating layer 252 is formed on the surface of the terminal surface 253 and the terminal 251 to cover a portion of the surface of the terminal surface 253 and the terminal 251 . The coating layer 252 is formed on the surface, that is, the upper surface of the terminal surface 253 and the terminal 251 to electrically insulate the terminal surface 253 and the terminal 251 or prevent them from being worn. can do. In this case, the coating layer 252 may be a photo solder resist (PSR) or a coverlay.

In addition, the coating layer 252 can prevent lead from being attached to unnecessary parts in the soldering process, and various elements and circuit patterns formed on the printed circuit board 250 are directly exposed to air and are damaged by oxygen and moisture. It can play a role in preventing oxidation or deterioration.

In addition, the coating layer 252 may be formed to surround each of the terminals 251 so that a portion of the surface of the terminal 251 is exposed. Since the terminal 251 is to be electrically coupled to the terminal 251 of the substrate 800, etc., it is appropriate to secure a soldering area for electrical coupling, so that the coating layer 252 is applied to the terminal 251. It may be formed on the upper surface of the terminal 251 leaving an exposed portion.

In this case, the coating layer 252 may be formed of, for example, photo solder resist ink or a polyimide material.

The photosensitive ink may form the coating layer 252 by applying liquid ink to the terminal surface 253 and the terminal 251 and then curing the liquid ink. At this time, after the photosensitive ink is applied to the terminal 251 as a whole, an exposed portion of the terminal 251 may be formed by removing unnecessary portions of the photosensitive ink through exposure and development. In addition, the exposed portion of the terminal 251 may be formed by applying and curing only a necessary portion.

In addition, polyimide may be manufactured in the form of a film or tape, and the exposed portion of the terminal 251 is coated by cutting the film or tape into a required shape and coating the surface of the terminal surface 253 and the terminal 251. The coating layer 252 may be formed so that is formed.

Alternatively, both photosensitive ink and polyimide may be used, and depending on the application method and product structure, photosensitive ink may be used first and then polyimide may be used, or polyimide may be used and then photosensitive ink may be applied.

Meanwhile, polyimide is a flexible material and can also be used as a material for manufacturing a flexible board (FPCB). Therefore, in the embodiment, the printed circuit board 250 and the coating layer 252 may be formed of the same material as polyimide.

On the other hand, referring to FIG. 5, the portion indicated by the hidden line in the terminal 251 is formed on the upper surface of the coating layer 252 and is electrically connected to various elements and circuit patterns provided on the printed circuit board 250. is a part

In addition, a portion of the terminal 251 indicated by a solid line in FIG. 5 is an exposed portion where the coating layer 252 is not formed on the upper surface in order to be electrically connected to the substrate 800 or the like. Also, in FIG. 6 , the terminal 251 is illustrated in the same manner as above.

Meanwhile, as shown in FIG. 5 , a boundary line L may be formed between the coating layer 252 and the terminal 251 . In the embodiment, the length of the boundary line L may be longer than the length of the terminal 251 in the width direction.

If the boundary line L' is formed equal to the length of the terminal 251 in the width direction, cracks may easily occur at the boundary line L'. That is, when the assembled camera module including the printed circuit board 250 is subjected to a fall or other impact, stress may occur at the boundary line L', and this stress may cause a crack at the boundary line L'. can cause

That is, based on the boundary line L', in FIGS. 5 and 6, the portion where the coating layer 252 is formed is indicated by the silver line of the terminal 251, and the terminal surface 253 is formed due to the coating layer 252. It can be relatively firmly coupled or fixed to.

However, an exposed portion of the terminal 251 indicated by a solid line, that is, an exposed portion where the coating layer 252 is not formed may be less firmly coupled or fixed compared to a portion indicated by a silver line. In addition, since the exposed portion may be connected to a device such as the substrate 800 by soldering or the like, an impact force received by the device such as the substrate 800 upon external impact may be directly transferred to the exposed portion.

Therefore, when the camera module is subjected to a drop or other external impact, the exposed portion of the terminal 251 may receive a greater impact than the non-exposed portion indicated by the silver line, and due to the difference in this impact, the boundary line (L ') Stress can be concentrated.

Stress generated at the boundary line L' may generate a crack in the terminal 251 along the boundary line L', and when stress is accumulated due to repetitive external impact, the crack grows and the terminal 251 moves along the boundary line ( L') may be broken and disconnected. If the terminal 251 is disconnected due to cracks, this may cause malfunction of the camera module.

In order to suppress the occurrence of cracks in the terminal 251, the length of the boundary line L formed between the coating layer 252 formed on the surface of the terminal 251 and the terminal 251 is ) can be formed longer than the length in the width direction.

For example, as shown in FIG. 5 , the boundary line L may be formed in a linear shape having a bending point, that is, in the shape of two isosceles triangles. In addition, the boundary line (L) may be formed in a triangular shape, that is, a pendulum in which two of the three sides of the triangle are connected.

When formed in this shape, the boundary line (L) may be formed longer than the length of the terminal 251 in the width direction, and therefore, the stress of the terminal 251 generated by the impact is linear at the longer boundary line (L). It can be dispersed compared to the boundary line (L').

When the stress is distributed due to the shape of the boundary line L, even if the exposed portion of the terminal 251 is impacted in the length direction or width direction of the terminal 251 by an external impact, it remains at a specific point of the boundary line L. Since concentration of stress can be suppressed, generation of cracks can be suppressed.

6 is a diagram showing a printed circuit board 250 according to another embodiment. As shown in FIG. 6, the boundary line L may be formed in a round shape, an arc shape, or a semicircular shape.

Even when formed in this shape, as in the case of FIG. 5, the boundary line L may be formed to be longer than the length of the terminal 251 in the width direction, and therefore, the longer boundary line L may be formed by impact. The stress of the terminal 251 may be distributed compared to the straight boundary line L'.

Therefore, as in the case of FIG. 5, the stress generated in the terminal 251 due to the external impact due to the distribution of stress can be suppressed from being concentrated at a specific point of the boundary line (L), thereby suppressing the occurrence of cracks. can

In addition, when the boundary line L is formed in a round shape, etc., a notch or a sharp edge is not formed on the boundary line L, so stress is concentrated on the notch or sharp edge and cracks occur. can prevent doing so.

On the other hand, although not shown, as long as the length of the boundary line L can be increased, for example, the boundary line may be in a wavy shape, a shape in which a linear shape having a bending point is repeated, a shape in which a round shape is repeated, or any other shape. (L) can be formed.

Meanwhile, the width D of the boundary line L measured in the longitudinal direction of the terminal 251 may be appropriately adjusted so that stress is not concentrated at a specific point of the boundary line L.

This means that when the width D of the boundary line L is small, crack generation may not be significantly suppressed compared to the straight boundary line L', and when the width D of the boundary line L is large, a notch or sharp This is because a part similar to an edge is formed and stress is concentrated in that part, which can cause cracks.

Therefore, for example, it may be appropriate that the width D of the boundary line L is in the range of 0.02 mm to 0.08 mm, more preferably, 0.03 mm to 0.07 mm.

7 is a diagram showing a printed circuit board 250 according to another embodiment. 8 is a side view showing a state of FIG. 7 viewed in a B direction. In FIG. 7 , the coating layer 252 formed and disposed on the uppermost layer of the printed circuit board 250 is indicated by hidden lines. This is shown for convenience in order to clearly explain the structure of the terminal 251 and the conductive layer 254 formed on the lower layer of the silver wire. This is also the case of FIG. 9 shown below.

As shown in FIGS. 7 and 8 , a conductive layer 254 electrically connected to the terminal 251 may be formed on a lower surface of the terminal 251 in the printed circuit board 250 of the embodiment.

The conductive layer 254 is formed in a plate shape made of copper or copper alloy, and is formed in the same number as the plurality of terminals 251, so that each terminal 251 and each conductive layer 254 are different terminals. 251 and the conductive layer 254 may be independently electrically connected to each other.

Although FIG. 7 exemplarily shows the case where the boundary line L has a linear shape with a bending point, the conductive layer even when the boundary line L is formed in any shape such as a round shape, an arc shape, a semicircular shape, or a wavy shape. (254) may be provided.

The conductive layer 254 may be provided to be electrically connected to the terminal 251 . To this end, for example, the conductive layer 254 and the terminal 251 may be formed to be electrically connected by a printing technique, and the conductive layer 254 and the terminal 251 are bonded by a conductive adhesive. It could be.

The laminated structure of the terminal surface 253 portion of the printed circuit board 250 may be as shown in FIG. 8 , for example. In the stacked structure, the terminal surface 253, the conductive layer 254, the terminal 251, and the coating layer 252 may be sequentially stacked in the central portion of the terminal 251.

Specifically, the terminal surface 253 may be disposed on the lowermost layer, and the conductive layer 254 may be disposed on the upper surface of the terminal surface 253 . Also, the terminal 251 may be disposed on an upper surface of the conductive layer 254 . In addition, a portion of the coating layer 252 may be disposed on the upper surface of the terminal surface 253, and the coating layer 252 may be disposed such that a portion of the upper surface of the terminal surface 253 is exposed.

As described above, the exposed portion of the upper surface of the terminal surface 253 may be electrically connected to a device such as the board 800 . At this time, the terminal surface 253, the conductive layer 254, and the terminal 251 are electrically connected to various elements and circuit patterns provided on the printed circuit board 250 or the terminal surface 253 and the terminal 251. The terminals 251 may be electrically connected to each other.

Even if a crack occurs at the interface between the terminal 251 and the coating layer 252 and the terminal 251 is disconnected, the terminal 251 is still electrically connected to the terminal surface 253 by the conductive layer 254. can keep Accordingly, the conductive layer 254 may serve to prepare for disconnection at the boundary surface of the terminal 251 .

9 is a diagram showing a printed circuit board 250 according to another embodiment. As shown in FIG. 9 , vias 255 may be provided in the printed circuit board 250 of the embodiment. At least one via 255 may be formed through the conductive layer 254 and the terminal 251 and may serve to electrically connect the conductive layer 254 and the terminal 251 .

The via 255 is formed by plating with a conductive metal such as copper or nickel, and the plated metal serves to electrically connect the terminal 251 and the conductive layer 254 disposed on the upper surface of the terminal 251. can

In addition, the via 255 is formed for each of the plurality of terminals 251 and the conductive layer 254, and one terminal 251 and the conductive layer 254 corresponding thereto have the overall size of the printed circuit board 250, One or more vias 255 may be provided in an appropriate number in consideration of the structure, the size of the vias 255, and the like.

In the laminated structure of the printed circuit board 250 according to the embodiment, the terminal surface 253, the conductive layer 254, the terminal 251, and the coating layer 252 are sequentially stacked at the center of the terminal 251, and vias ( 255) may be provided.

Specifically, the terminal surface 253 may be disposed on the lowermost layer, and the conductive layer 254 may be disposed on the upper surface of the terminal surface 253 . Also, the terminal 251 may be disposed on an upper surface of the conductive layer 254 . In addition, a portion of the coating layer 252 may be disposed on the upper surface of the terminal surface 253, and the coating layer 252 may be disposed such that a portion of the upper surface of the terminal surface 253 is exposed.

In addition, the via 255 formed through the conductive layer 254 and the terminal 251 may be provided, and the via 255 may include the terminal surface 253, the conductive layer 254 and It may serve to electrically connect the terminal 251.

The terminal surface 253, the conductive layer 254, and the terminal 251 are electrically connected by the via 255, and various elements provided on the printed circuit board 250 or the terminal surface 253 , The circuit pattern and the terminal 251 may be electrically connected to each other.

Even if a crack occurs at the interface between the terminal 251 and the coating layer 252 and the terminal 251 is disconnected, the via 255 still maintains the terminal 251 between the terminal surface 253 and the conductive layer. (254) and maintain electrical connection. Accordingly, the via 255 may serve to prepare for disconnection at the interface of the terminal 251 .

In the embodiment, the printed circuit board 250 extends the length of the boundary line L formed between the coating layer 252 and the terminal 251 to widely distribute the stress generated along the boundary line L, thereby reducing stress. Crack generation due to concentration can be suppressed.

In addition, the printed circuit board 250 is provided with a conductive layer 254 to ensure electrical connection between the printed circuit board 250 and the terminal 251 even if the terminal 251 is disconnected due to stress generated at the boundary line L. There is an effect that can be maintained.

In addition, the printed circuit board 250 includes vias 255 to maintain electrical connection between the printed circuit board 250 and the terminal 251 even if the terminal 251 is disconnected due to stress generated at the boundary line L. There are possible effects.

Meanwhile, the printed circuit board 250 according to the above-described embodiment may be used for a lens driving device as described above. In addition, the lens driving device may be used in various fields, for example, a camera module as described above. In addition, the camera module can be applied to mobile devices such as mobile phones.

Although only a few have been described as described above in relation to the embodiments, various other forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms unless they are incompatible with each other, and through this, may be implemented in a new embodiment.

210: base
250: printed circuit board
251 terminal
252: coating layer
253: terminal surface
254: conductive layer
255 Via
800: second holder
820: soldering part
D: border width
L, L': boundary line

Claims (25)

housing;
a bobbin disposed within the housing;
a first coil and a magnet that move the bobbin by interaction; and
A circuit board electrically connected to the first coil,
The circuit board includes a terminal surface, a plurality of terminals disposed on the terminal surface, and a coating layer disposed on the terminal surface and upper surfaces of the plurality of terminals,
The coating layer exposes a portion of an upper surface of each of the plurality of terminals,
At least a portion of the coating layer is disposed between the plurality of terminals,
The at least part of the coating layer extends to one end of the terminal surface where one end of each of the plurality of terminals is disposed,
The lens driving device of claim 1 , wherein an end of at least a portion of the coating layer extending to the one end of the terminal surface is spaced apart from the plurality of terminals. According to claim 1,
A first boundary line is formed between the coating layer and an upper surface of each of the plurality of terminals, and a length of the first boundary line is longer than a width of each of the plurality of terminals. According to claim 2,
A second boundary line is formed between a portion of the terminal surface positioned between the plurality of terminals and the coating layer, and the second boundary line extends to the one end of the terminal surface. According to claim 2,
The first boundary line,
A lens driving device formed in at least one of a linear shape, a triangular shape, a round shape, an arc shape, and a semicircular shape having a bending point. According to claim 1,
The coating layer,
A lens driving device made of photo solder resist ink or polyimide. According to claim 1,
The circuit board includes a conductive layer disposed between the terminal surface and lower surfaces of the plurality of terminals,
The terminal surface, the conductive layer, and the plurality of terminals are electrically connected to the lens driving device. According to claim 1,
an elastic member coupled to the bobbin and the housing; and
A lens driving device including a second coil facing the magnet and electrically connected to the circuit board. According to claim 7,
The second coil,
a circuit member disposed on the circuit board; and
A lens driving device including a coil formed on the circuit member and facing the magnet. According to claim 1,
And a base disposed below the bobbin,
The circuit board is disposed on the upper surface of the base,
The lens driving device wherein the terminal surface is bent on the upper surface of the circuit board. According to claim 2,
The first boundary line has a width of 0.03 mm to 0.07 mm in the longitudinal direction of the terminals. According to claim 6,
The circuit board includes vias penetrating the conductive layer and each of the plurality of terminals,
The via electrically connects the terminal surface, the conductive layer, and the plurality of terminals. housing;
a bobbin disposed within the housing;
a first coil and a magnet that move the bobbin by interaction; and
A circuit board electrically connected to the first coil,
The circuit board includes a terminal surface, a plurality of terminals disposed on the terminal surface, and a coating layer disposed on the terminal surface and upper surfaces of the plurality of terminals,
Each of the plurality of terminals includes a first exposed area exposed from the coating layer, and a length of a first boundary line between the first exposed area and the coating layer is longer than a width of each of the plurality of terminals,
The coating layer includes a first portion disposed on a partial region of the terminal surface located between the plurality of terminals, and the first portion of the coating layer is disposed on one end of each of the plurality of terminals. It extends to one end of the terminal surface,
An end of the first portion of the coating layer extending to the one end of the terminal surface is spaced apart from the plurality of terminals. According to claim 12,
The circuit board includes a conductive layer disposed on the terminal surface,
The plurality of terminals are disposed on the upper surface of the conductive layer,
Each of the plurality of terminals exposes a portion of the upper surface of the conductive layer,
The coating layer exposes a portion of the upper surface of the conductive layer exposed from the plurality of terminals,
The terminal surface, the conductive layer, and the plurality of terminals are electrically connected to the lens driving device. housing;
a bobbin disposed within the housing;
a first coil and a magnet that move the bobbin by interaction;
a second coil facing the magnet and moving the housing through interaction with the magnet;
a circuit board electrically connected to the second coil; and
And a base disposed under the circuit board,
The circuit board,
an upper surface disposed on the upper surface of the base;
a terminal surface bent from the upper surface;
a plurality of terminals disposed on the terminal surface; and
A coating layer disposed on an upper surface of the terminal surface and upper surfaces of the plurality of terminals,
The coating layer exposes at least a portion of an upper surface of each of the plurality of terminals,
The coating layer includes a first region disposed on a portion of an upper surface of each of the plurality of terminals and a second region disposed on the terminal surface between the plurality of terminals,
A first boundary line is formed between the first region of the coating layer and upper surfaces of the plurality of terminals,
The first boundary line includes a first line, a second line, and a vertex where the first line and the second line meet,
The vertex is closer to the other end of the terminal surface than to one end of the terminal surface,
The other end of the terminal surface is a portion where the upper surface of the circuit board and the terminal surface meet, and one end of the terminal surface is located on the opposite side of the other end of the terminal surface and a portion where one end of each of the plurality of terminals is disposed. ego,
The second region of the coating layer extends to the one end of the terminal surface,
An end of the second region of the coating layer extending to the one end of the terminal surface is spaced apart from the plurality of terminals. According to claim 14,
The first boundary line is a lens driving device composed of two equilateral shapes of an isosceles triangle. According to claim 14,
A lens driving device in which a partial region of the terminal surface positioned between the plurality of terminals and the second region of the coating layer is exposed from the coating layer. According to claim 14,
A second boundary line is formed between the second region of the coating layer and the terminal surface, and the second boundary line extends to the one end of the terminal surface. According to claim 14,
The first boundary line has a round shape, an arc shape, or a semicircular shape between the first line and the second line. According to claim 14,
The upper surface of each of the plurality of terminals includes a first side and a second side located opposite the first side,
Each of the first side and the second side is parallel to a direction from one end of the terminal surface to the other end of the terminal surface. According to claim 19,
The vertex is closer to the other end of the terminal surface than the first part of the first boundary line, and the first part of the first boundary line is the first side or the second side of the upper surface of the terminal and the first boundary line. The lens drive unit that is the meeting point. According to claim 14,
an elastic member coupled to the bobbin and the housing;
a second coil disposed on the circuit board and facing the magnet; and
A lens driving device including a support member electrically connected to the elastic member. housing;
a bobbin disposed within the housing;
a first coil and a magnet that move the bobbin by interaction; and
a circuit board electrically connected to the first coil; and
A second coil electrically connected to the circuit board, disposed to face the magnet, and moving the housing through interaction with the magnet;
The circuit board includes a terminal surface, a plurality of terminals disposed on the terminal surface, and a coating layer disposed on the terminal surface and an upper surface of the plurality of terminals,
The coating layer exposes at least a portion of an upper surface of each of the plurality of terminals,
A first boundary line is formed on the upper surface of each of the coating layer and the plurality of terminals,
A second boundary line is formed between a portion of the terminal surface positioned between the plurality of terminals and the coating layer, and the second boundary line is one end of the terminal surface where one end of each of the plurality of terminals is disposed. extended to
An end of the second boundary line extending to the one end of the terminal surface is spaced apart from the plurality of terminals. terminal side;
a plurality of terminals disposed on the terminal surface; and
A coating layer disposed on the terminal surface and upper surfaces of the plurality of terminals,
The coating layer exposes a portion of an upper surface of each of the plurality of terminals,
At least a portion of the coating layer is disposed between the plurality of terminals,
The at least part of the coating layer extends to one end of the terminal surface where one end of each of the plurality of terminals is disposed,
The printed circuit board of claim 1 , wherein an end of at least a portion of the coating layer extending to the one end of the terminal surface is spaced apart from the plurality of terminals. lens;
a lens driving device coupled to the lens and disposed according to any one of claims 1 to 22; and
A camera module including an image sensor. A mobile device comprising the camera module according to claim 24 .

Images