TWI750358B - Camera module - Google Patents

Abstract

A camera module includes a housing accommodating a lens barrel, and having an opening in a side surface of the housing, a focus adjusting part configured to move the lens barrel in an optical axis direction, a shake correction part configured to move the lens barrel in a direction perpendicular to an optical axis, and a substrate for providing driving signals to the focus adjusting unit and the shake correcting part, wherein the substrate includes a rigid portion, in which a plurality of copper foil patterns are stacked and embedded, and a flexible portion, formed in an outer side surface of the rigid portion and configured to be bent, the rigid portion is inserted into the opening, and the flexible portion is attached to the housing.

Description

camera module

The present invention relates to a camera module.

Recently, camera modules have been used in mobile communication terminals such as tablet personal computers (PCs) and notebook computers including smart phones.

In addition, the camera module is equipped with an automatic focus adjustment function and a shake correction function, and a configuration for measuring the position of the lens is added for precise control.

Recently, with the trend of miniaturization of mobile communication terminals and camera modules, the size of the actuator for performing the automatic focus adjustment function and the shake correction function is also reduced.

However, there is a problem that as the size of the actuator decreases, the magnitude of the driving force for driving the lens decreases, and the sensitivity of the sensor for measuring the position of the lens decreases, making it difficult to drive accurately.

That is, there is a problem that it is difficult to satisfy both the miniaturization of the camera module and the improvement of the performance of the camera module.

An object of an embodiment of the present invention is to provide a camera module, which not only miniaturizes the camera module, but also ensures sufficient driving force, and on the other hand, can accurately measure the position of the lens barrel.

A camera module according to an embodiment of the present invention may include: a housing for accommodating a lens barrel and having an opening on a side surface; a focus adjustment part configured to move the lens barrel along the optical axis; The lens barrel is configured to move in a direction perpendicular to the optical axis; and a substrate provides a drive signal to the focus adjustment portion and the shake correction portion, the substrate includes a rigid portion on which a plurality of copper foil patterns are laminated and embedded, and The flexible portion formed on the outer surface of the rigid portion and configured to be bendable, the rigid portion is inserted into the opening portion, and the flexible portion is attached to the housing.

The camera module of an embodiment of the present invention not only miniaturizes the camera module, but also ensures sufficient driving force, and on the other hand, can accurately measure the position of the lens barrel.

100: Camera Module

110: Shell

120: Shell

210: Lens barrel

300: Carrier

301: The first guide groove part

302: The third guide groove part

310: Frame

311: The second guide groove part

320: Lens Holder

330: Stopper

400: Focus Adjustment Section

410, 510a, 520a: Magnets

430: First drive coil

450, 510c, 520c: Yoke

470: First Sensing Coil

470a, 470b, 531b, 532b, 533b: Coils

500: Shake Correction Department

510b, 520b: the second driving coil

530a: Sensing yoke

530b: Second sensing coil

600: Substrate

610: Hard part

611: First hard part

612: Second hard part

613: Third hard part

614: Hard Part 4

620: Soft Ministry

621: First Soft Division

622: Second Soft Division

623: Third Soft Division

630: first insulating layer

640: Copper foil pattern

650, 680: insulating layer

660: Soft basement membrane

670: Copper Foil

700: Image sensor module

710: Image Sensor

720: Printed Circuit Board

B1: Rolling member

B2: The first spherical member

B3: Second spherical member

B4: The third ball member

FIG. 1 is a perspective view of a camera module according to an embodiment of the present invention.

2 is a schematic exploded perspective view of a camera module according to an embodiment of the present invention.

3 is an exploded perspective view showing a part of a shake correction unit of the camera module according to the embodiment of the present invention.

4 is a side view of a substrate of a camera module according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along II' of FIG. 4 .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the inventive idea is not limited to the proposed embodiments.

For example, those skilled in the art who understand the idea of the present invention can reveal other embodiments included in the idea of the present invention by adding, changing, or deleting constituent elements, etc., but these embodiments are also included in the idea of the present invention. .

The present invention relates to a camera module, which can be applied to portable electronic devices such as mobile communication terminals, smart phones, tablet PCs, and the like.

1 is a perspective view of a camera module according to an embodiment of the present invention, and FIG. 2 is a schematic exploded perspective view of a camera module according to an embodiment of the present invention.

In addition, FIG. 3 is an exploded perspective view showing a part of the shake correction unit of the camera module according to the embodiment of the present invention.

1 to 3 , a camera module 100 according to an embodiment of the present invention includes a lens barrel 210 , a lens driving device for moving the lens barrel 210 , and converting light incident through the lens barrel 210 into electrical signals The image sensor module 700, the housing 120 and the housing 110 for accommodating the lens barrel 210 and the lens driving device.

The lens barrel 210 can be in the shape of a hollow cylinder, so that a plurality of lenses for photographing the subject can be accommodated therein, and the plurality of lenses are mounted to the lens barrel 210 along the optical axis.

The plurality of lenses are arranged in a required number according to the design of the lens barrel 210, and each lens has the same or different optical properties such as refractive index.

The lens driving device is a device that moves the lens barrel 210 .

As an example, the lens driving device can adjust the focus by moving the lens barrel 210 in the direction of the optical axis (Z axis), and can correct the shooting by moving the lens barrel 210 in the direction perpendicular to the optical axis (Z axis). shaking.

The lens driving device includes a focus adjustment unit 400 that adjusts the focus, and a blur correction unit 500 that corrects blur.

The image sensor module 700 is a device that converts light incident through the lens barrel 210 into electrical signals.

As an example, the image sensor module 700 may include an image sensor 710 and a printed circuit board 720 connected to the image sensor 710, and may further include an infrared filter.

The infrared filter functions to block light in the infrared region among the light incident through the lens barrel 210 .

The image sensor 710 converts light incident through the lens barrel 210 into electrical signals. As an example, the image sensor 710 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS).

The electrical signal converted by the image sensor 710 is output in the form of an image by the display unit of the portable electronic device.

The image sensor 710 is fixed to the printed circuit board 720 and is electrically connected to the printed circuit board 720 by wire bonding.

The lens barrel 210 and the lens driving device are accommodated in the housing 120 .

As an example, the casing 120 has a shape in which the upper part and the lower part are opened, and the lens barrel 210 and the lens driving device are accommodated in the inner space of the casing 120 .

The image sensor module 700 is disposed on the lower part of the casing 120 .

In addition, a substrate 600 for supplying driving signals to the focus adjustment unit 400 and the shake correction unit 500 is disposed on the side surface of the housing 120 . The substrate 600 is provided in the form of one substrate 600 covering the 4 sides of the housing 120 .

As described below, the side surface of the housing 120 is provided with openings so that the first driving coil 430 and the first sensing coil 470 of the focus adjustment unit 400 and the second driving coils 510b and 520b and the second driving coils 510b and 520b of the shake correction unit 500 can be inserted. Sense coil 530b.

The casing 110 is combined with the outer casing 120 and functions to protect the internal components of the camera module 100 .

In addition, the casing 110 can function to shield electromagnetic waves.

As an example, the housing 110 can shield electromagnetic waves, so that the electromagnetic waves generated in the camera module do not affect other electronic components in the portable electronic device.

In addition, the portable electronic device is equipped with a plurality of electronic parts other than the camera module, so the housing 110 can shield electromagnetic waves, so that the electromagnetic waves generated in such electronic parts do not affect the camera module.

The casing 110 is provided with a metal material so as to be grounded to the ground pad provided on the printed circuit board 720 , thereby shielding electromagnetic waves.

2 , the focus adjustment unit 400 in the lens driving device of the camera module according to an embodiment of the present invention will be described.

In order to focus on the subject, the lens barrel 210 is moved by the lens driving device.

As an example, the present invention includes a focus adjustment unit 400 that moves the lens barrel 210 in the direction of the optical axis (Z axis).

The focus adjustment part 400 includes a carrier 300 for accommodating the lens barrel 210 , a magnet 410 and a first driving coil 430 for generating a driving force to move the lens barrel 210 and the carrier 300 in the direction of the optical axis (Z axis).

The magnet 410 is mounted to the carrier 300 . As an example, the magnet 410 may be mounted to one side of the carrier 300 .

The first driving coil 430 may be a copper foil pattern embedded in the substrate 600 in layers. The substrate 600 is mounted to the side surface of the housing 120 in such a manner that the magnet 410 is opposed to the first driving coil 430 in a direction perpendicular to the optical axis (Z axis).

The magnet 410 is a moving member that is attached to the carrier 300 and moves in the optical axis (Z-axis) direction together with the carrier 300 , and the first driving coil 430 is a fixed member fixed to the housing 120 .

If power is applied to the first driving coil 430 , the carrier 300 can be moved in the direction of the optical axis (Z axis) by the electromagnetic influence between the magnet 410 and the first driving coil 430 .

The lens barrel 210 is accommodated in the carrier 300 , so the lens barrel 210 also moves in the direction of the optical axis (Z axis) due to the movement of the carrier 300 . As shown in FIG. 2 , the frame 310 and the lens holder 320 are accommodated in the carrier 300 , so the frame 310 , the lens holder 320 and the lens barrel 210 also move along the optical axis (Z axis) by the movement of the carrier 300 .

When the carrier 300 moves, in order to reduce the friction between the carrier 300 and the housing 120 , a rolling member B1 is arranged between the carrier 300 and the housing 120 . The rolling member B1 may be in the form of a ball.

The rolling members B1 are arranged to both sides of the magnet 410 .

The yoke 450 is arranged so as to be opposed to the magnet 410 in a direction perpendicular to the optical axis (Z axis). As an example, the yoke 450 is attached to the outer surface of the substrate 600 (embedded with the opposite side of the side of the first drive coil 430). Therefore, the yoke 450 is arranged so as to face the magnet 410 with the first drive coil 430 interposed therebetween.

An attractive force acts between the yoke 450 and the magnet 410 in a direction perpendicular to the optical axis (Z axis).

Therefore, the rolling member B1 can maintain a contact state with the carrier 300 and the housing 120 by the attractive force between the yoke 450 and the magnet 410 .

In addition, the yoke 450 also functions to focus the magnetic force of the magnet 410 . Thereby, the occurrence of leakage magnetic flux can be prevented.

As an example, the yoke 450 and the magnet 410 form a magnetic circuit.

The present invention uses a closed-loop control method that senses the position of the lens barrel 210 and performs feedback.

Therefore, the first position measuring unit is provided for closed-loop control. The first position measuring unit includes the first sensing coil 470 . Similar to the first driving coil 430 , the first sensing coil 470 may also be a copper foil pattern which is laminated and embedded in the substrate 600 .

The first sensing coil 470 is arranged so as to face the magnet 410 and is arranged at a position adjacent to the first driving coil 430 .

As an example, the first sensing coil 470 is arranged to face the magnet 410 in a direction perpendicular to the optical axis (Z axis).

The inductance of the first sensing coil 470 changes as the magnet 410 moves in the direction of the optical axis (Z axis). Therefore, the position of the magnet 410 can be sensed according to the change of the inductance of the first sensing coil 470 . The magnet 410 is mounted on the carrier 300, the carrier 300 accommodates the lens barrel 210, and the carrier 300 and the lens barrel 210 move along the optical axis (Z axis) direction together, Therefore, as a result, the position of the lens barrel 210 (position in the direction of the optical axis (Z axis)) can be sensed according to the change of the inductance of the first sensing coil 470 .

The first sensing coil 470 may include a plurality of coils arranged in the direction of the optical axis (Z axis). For example, the first sensing coil 470 includes two coils 470a and 470b arranged in the direction of the optical axis (Z axis).

When the magnet 410 moves in the direction of the optical axis (Z axis), the signal difference generated in the two coils 470a and 470b of the first sensing coil 470 can be used to more accurately sense the position of the lens barrel 210 on the optical axis (Z axis). position in the Z-axis).

On the other hand, the first position measuring unit may further include at least one capacitor, and the at least one capacitor and the first sensing coil 470 may form a specific oscillation circuit. As an example, at least one capacitor is provided corresponding to the number of coils included in the first sensing coil 470, so that one capacitor and one coil 470a or coil 470b may be configured as a specific one such as an inductor-capacitor oscillator (LC oscillator). form.

The first position measuring unit can determine the displacement of the lens barrel 210 according to the frequency change of the oscillation signal generated in the oscillation circuit. Specifically, when the inductance of the first sensing coil 470 forming the oscillation circuit changes, the frequency of the oscillation signal generated in the oscillation circuit changes, so the displacement of the lens barrel 210 can be detected based on the change in frequency.

On the other hand, in this embodiment, the first sensing coil 470 is illustrated as being opposite to the magnet 410 , but a sensing yoke can also be arranged at a position adjacent to the magnet 410 so as to be opposite to the first sensing coil 470 . The sensing yoke can be provided with an electrical conductor.

Next, with reference to FIGS. 2 and 3 , the shake correction unit 500 in the lens driving device of the camera module according to an embodiment of the present invention will be described.

The shake correction unit 500 is used for correcting the blurring of the image or the shaking of the video due to factors such as the user's hand shake when shooting images or videos.

For example, the shake correction unit 500 compensates the shake by imparting a relative displacement corresponding to the shake to the lens barrel 210 when shake occurs when shooting a video due to a user's hand shake or the like.

As an example, the shake correction unit 500 corrects the shake by moving the lens barrel 210 in a direction perpendicular to the optical axis (Z axis).

The shake correction section 500 includes a guide member that guides the movement of the lens barrel 210, and a plurality of magnets 510a, 520a that generate a driving force to move the guide member in a direction perpendicular to the optical axis (Z axis) and a second drive Coils 510b, 520b.

The guide member includes a frame 310 and a lens holder 320 . The frame 310 and the lens holder 320 are inserted into the carrier 300 and arranged in the direction of the optical axis (Z axis), and function to guide the movement of the lens barrel 210 .

The frame 310 and the lens holder 320 have a space into which the lens barrel 210 can be inserted. The lens barrel 210 is inserted and fixed to the lens holder 320 .

The frame 310 and the lens holder 320 are moved relative to the carrier 300 in a direction perpendicular to the optical axis (Z axis) by the driving force generated by the plurality of magnets 510a, 520a and the second driving coils 510b, 520b.

A part of the magnet 510a and a part of the second drive coil 510b among the plurality of magnets 510a, 520a and the second driving coils 510b, 520b generate driving force in the direction of the first axis (X axis) perpendicular to the optical axis (Z axis), and the rest The magnet 520a and the remaining second driving coils 520b generate driving force in the direction of the second axis (Y axis) perpendicular to the first axis (X axis). That is, the magnet and the coil generate driving force in directions opposite to each other.

Here, the second axis (X axis) refers to an axis perpendicular to the optical axis (Z axis) and the first axis (Y axis).

The plurality of magnets 510a and 520a are arranged so as to be orthogonal to each other with respect to a plane perpendicular to the optical axis (Z axis).

A plurality of magnets 510a , 520a are mounted to the lens holder 320 . As an example, the plurality of magnets 510a and 520a are attached to the side surfaces of the lens holder 320, respectively. The side surface of the lens holder 320 includes a first surface and a second surface that are perpendicular to each other, and magnets are respectively disposed on the first surface and the second surface of the lens holder 320 .

The second driving coils 510b and 520b may be copper foil patterns embedded in the substrate 600 in layers. The substrate 600 is mounted to the side surface of the housing 120 in such a manner that the plurality of magnets 510a, 520a are opposed to the second driving coils 510b, 520b in a direction perpendicular to the optical axis (Z axis).

The plurality of magnets 510a and 520a are moving members that move in a direction perpendicular to the optical axis (Z axis) together with the lens holder 320 , and the second driving coils 510b and 520b are fixed members fixed to the housing 120 .

On the other hand, in the present invention, a plurality of spherical members that support the frame 310 and the lens holder 320 of the shake correction portion 500 are provided. The plurality of spherical members function to guide the movement of the frame 310 , the lens holder 320 , and the lens barrel 210 during the shake correction process. In addition, it also functions to maintain the space between the carrier 300 , the frame 310 and the lens holder 320 .

The plurality of ball members include a first ball member B2 and a second ball member B3.

The first ball member B2 guides the movement of the frame 310, the lens holder 320 and the lens barrel 210 along the first axis (X-axis) direction, and the second ball member B3 guides the lens holder 320 and the lens barrel 210 along the first axis (X-axis). The movement in the two-axis (Y-axis) direction is guided.

As an example, when the driving force in the direction of the first axis (X axis) is generated, the first ball member B2 performs rolling motion in the direction of the first axis (X axis). Therefore, the first ball member B2 guides the movement of the frame 310, the lens holder 320, and the lens barrel 210 in the direction of the first axis (X axis).

In addition, when the driving force in the direction of the second axis (Y axis) is generated, the second ball member B3 performs rolling motion in the direction of the second axis (Y axis). Therefore, the second ball member B3 guides the movement of the lens holder 320 and the lens barrel 210 in the direction of the second axis (Y axis).

The first ball member B2 includes a plurality of ball members disposed between the carrier 300 and the frame 310 , and the second ball member B3 includes a plurality of ball members disposed between the frame 310 and the lens holder 320 .

A first guide groove portion 301 for accommodating the first ball member B2 is formed on the surfaces of the carrier 300 and the frame 310 that face each other along the optical axis (Z-axis) direction, respectively. The first guide groove portion 301 includes a plurality of guide grooves corresponding to the plurality of ball members of the first ball member B2.

The first ball member B2 is accommodated in the first guide groove portion 301 and inserted between the carrier 300 and the frame 310 .

When the first ball member B2 is accommodated in the first guide groove portion 301, the movement along the optical axis (Z axis) and the second axis (Y axis) direction is limited, and can only be moved along the first axis (X axis) direction move. As an example, the first ball member B2 can only perform rolling motion in the direction of the first axis (X axis).

For this reason, each planar shape of the plurality of guide grooves of the first guide groove portion 301 may be a rectangle having a length along the first axis (X-axis) direction.

A second guide groove portion 311 for accommodating the second ball member B3 is formed on the surfaces of the frame 310 and the lens holder 320 facing each other along the optical axis (Z axis) direction, respectively. The second guide groove portion 311 includes a plurality of guide grooves corresponding to the plurality of ball members of the second ball member B3.

The second ball member B3 is accommodated in the second guide groove portion 311 and fitted between the frame 310 and the lens holder 320 .

When the second ball member B3 is accommodated in the second guide groove portion 311 , the movement along the optical axis (Z axis) and the first axis (X axis) direction is limited, and can only move along the second axis (Y axis) direction move. As an example, the second ball member B3 can only perform rolling motion in the direction of the second axis (Y axis).

For this reason, each planar shape of the plurality of guide grooves of the second guide groove portion 311 may be a rectangle having a length in the direction of the second axis (Y-axis).

On the other hand, in the present invention, a third ball member B4 that is arranged between the carrier 300 and the lens holder 320 to support the movement of the lens holder 320 is provided.

The third ball member B4 guides the movement of the lens holder 320 in the direction of the first axis (X axis) and the movement in the direction of the second axis (Y axis).

As an example, when the driving force in the direction of the first axis (X axis) is generated, the third ball member B4 performs rolling motion in the direction of the first axis (X axis). Therefore, the third ball member B4 guides the movement of the lens holder 320 in the direction of the first axis (X axis).

In addition, when the driving force in the direction of the second axis (Y axis) is generated, the third ball member B4 performs a rolling motion in the direction of the second axis (Y axis). Therefore, the third ball member B4 guides the movement of the lens holder 320 in the direction of the second axis (Y axis).

On the other hand, the second ball member B3 supports the lens holder 320 in contact with the third ball member B4.

A third guide groove portion 302 for accommodating the third ball member B4 is formed on the opposite surfaces of the carrier 300 and the lens holder 320 along the optical axis (Z axis) direction, respectively.

The third ball member B4 is accommodated in the third guide groove portion 302 and inserted between the carrier 300 and the lens holder 320 .

When the third ball member B4 is accommodated in the third guide groove portion 302, the movement in the direction of the optical axis (Z axis) is limited, and the movement in the direction of the first axis (X axis) and the second axis (Y axis) is limited. rolling motion.

To this end, the planar shape of the third guide groove portion 302 may be circular. Therefore, the planar shape of the third guide groove portion 302 is different from the planar shape of the first guide groove portion 301 and the second guide groove portion 311 .

The first ball member B2 can only roll along the first axis (X axis), the second ball member B3 can only roll along the second axis (Y axis), and the third ball member B4 can roll along the first axis (X-axis) and the second axis (Y-axis) to perform rolling motion.

Therefore, the plurality of spherical members supporting the sway correction unit 500 of the present invention differ in degrees of freedom.

Here, degrees of freedom may refer to the number of independent parameters required to represent the motion state of an object in a three-dimensional coordinate system.

Generally, in a three-dimensional coordinate system, the degree of freedom of an object is 6. The movement of the object can be represented by an orthogonal coordinate system in three directions and a rotational coordinate system in three directions.

As an example, in a three-dimensional coordinate system, an object can perform translational motion along each axis (X-axis, Y-axis, Z-axis), and can perform rotational motion based on each axis (X-axis, Y-axis, Z-axis).

In this specification, the degree of freedom may refer to the following meanings: when power is applied to the shake correction unit 500 and the shake correction unit 500 moves due to a driving force generated in a direction perpendicular to the optical axis (Z axis), it represents the first spherical member B2 , the number of independent parameters required for the movement of the second ball member B3 and the third ball member B4.

As an example, the third ball member B4 can roll along two axes (a first axis (X axis) and a second axis (Y axis)) by a driving force generated in a direction perpendicular to the optical axis (Z axis) Movement, the first ball member B2 and the second ball member B3 can perform rolling motion along one axis (the first axis (X axis) or the second axis (Y axis)).

Therefore, the degree of freedom of the third spherical member B4 is greater than the degrees of freedom of the first spherical member B2 and the second spherical member B3.

If the driving force is generated along the first axis (X axis) direction, the frame 310, the lens holder 320 and the lens barrel 210 move together along the first axis (X axis) direction.

Here, the first ball member B2 and the third ball member B4 perform rolling motion along the first axis (X axis). At this time, the movement of the second ball member B3 is restricted.

In addition, when the driving force is generated in the direction of the second axis (Y axis), the lens holder 320 and the lens barrel 210 move in the direction of the second axis (Y axis).

Here, the second ball member B3 and the third ball member B4 perform rolling motion along the second axis (Y axis). At this time, the movement of the first ball member B2 is restricted.

The present invention uses a closed-loop control method for feedback by sensing the position of the lens barrel 210 during the shake correction process.

Therefore, a second position measuring unit for closed-loop control is provided.

The second position measuring unit may include a sensing yoke 530a and a second sensing coil 530b.

The sensing yoke 530a is attached to the side of the lens holder 320 . As an example, the sensing yoke 530a may be attached to the third face of the lens holder 320 . The third face of the lens holder 320 may be a face perpendicular to the first face or the second face.

The second sensing coil 530b is arranged so as to be opposed to the sensing yoke 530a in the direction perpendicular to the optical axis (Z axis).

Similar to the second driving coils 510b and 520b, the second sensing coil 530b may also be a copper foil pattern which is laminated and embedded in the substrate 600 .

The second sensing coil 530b may include a plurality of coils arranged in a direction perpendicular to the optical axis (Z axis). As an example, the second sensing coil 530b may include three coils 531b, 532b, and 533b arranged in a direction perpendicular to the optical axis (Z-axis).

If an alternating current is applied to the second sensing coil 530b, the magnetic field of the second sensing coil 530b can induce an eddy current to the sensing yoke 530a. Here, the sensing yoke 530a can be provided with an electrical conductor.

The inductance of the second sensing coil 530b changes due to the eddy current. The amount of change in the inductance of the second sensing coil 530b is affected by the distance between the second sensing coil 530b and the sensing yoke 530a.

The sensing yoke 530a is attached to the lens holder 320, and the lens holder 320 moves together with the lens barrel 210 in the directions of the first axis (Y axis) and the second axis (X axis) perpendicular to the optical axis (Z axis) , so the position of the lens barrel 210 in the first axis (Y axis) and the second axis (X axis) direction can be determined according to the change of the inductance of the second sensing coil 530b.

On the other hand, in order to sense the position of the lens barrel 210 according to the inductance change, the second sensing coil 530b may include two coils, but in order to reduce the noise generated by the inductance change caused by the temperature change, in this embodiment The second sensing coil 530b includes 3 coils.

On the other hand, in the present invention, a plurality of yokes 510c and 520c are provided so that the shake correcting portion 500 is kept in contact with the first ball member B2, the second ball member B3 to the third ball member B4.

The plurality of yokes 510c, 520c are fixed to the carrier 300, and are arranged to face the plurality of magnets 510a, 520a in the optical axis (Z-axis) direction.

Therefore, an attractive force is generated in the direction of the optical axis (Z axis) between the plurality of yokes 510c and 520c and the plurality of magnets 510a and 520a.

Due to the attractive force between the plurality of yokes 510c and 520c and the plurality of magnets 510a and 520a, the shake corrector 500 is pressed in the direction toward the plurality of yokes 510c and 520c, so that the frame 310 and the lens of the shake corrector 500 are held by the frame 310 and the lens. The device 320 may maintain a contact state with the first ball member B2, the second ball member B3 to the third ball member B4.

The plurality of yokes 510c and 520c are made of a material that can generate attractive force with the plurality of magnets 510a and 520a. As an example, a plurality of yokes 510c and 520c are provided with a magnetic body.

In the present invention, a plurality of magnetic yokes 510c and 520c are provided to keep the frame 310 and the lens holder 320 in contact with the first ball member B2, the second ball member B3 to the third ball member B4, and on the other hand, the The stopper 330 prevents the first ball member B2 , the second ball member B3 to the third ball member B4 , the frame 310 and the lens holder 320 from being detached to the outside of the carrier 300 due to external impact or the like.

The stopper 330 is coupled to the carrier 300 in a manner of covering at least a part of the upper surface of the lens holder 320 .

FIG. 4 is a side view of a substrate of a camera module according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line II′ of FIG. 4 .

Referring to FIGS. 4 and 5 , the camera module 100 according to an embodiment of the present invention provides a substrate 600 for providing driving signals to the focus adjustment unit 400 and the shake correction unit 500 .

The substrate 600 is provided in such a manner that one substrate 600 covers the four sides of the housing 120 .

To this end, the base plate 600 is formed in a bendable or bendable manner. The substrate 600 includes: a rigid part 610 in which a plurality of coils 430, 470, 510b, 520b, and 530b are laminated and embedded; and a flexible part 620, which is formed in a bendable or bendable manner. The soft part 620 may be formed to a portion corresponding to the corner area of the housing 120 .

As an example, the substrate 600 includes: a first rigid part 611 , in which the first driving coil 430 and the first sensing coil 470 of the focus adjusting part 400 are embedded in layers; the second rigid part 612 and the third rigid part 613 are laminated and embedded in the wobble The second driving coils 510b and 520b of the correction part 500 and the fourth rigid part 614 are laminated and embedded with the second sensing coil 530b. In addition, the substrate 600 includes a first flexible portion 621 between the first rigid portion 611 and the second rigid portion 612 , includes a second flexible portion 622 between the second rigid portion 612 and the third rigid portion 613 , and includes a second flexible portion 622 between the second rigid portion 612 and the third rigid portion 613 . A third flexible portion 623 is included between the portion 613 and the fourth rigid portion 614 .

Referring to FIG. 5 , the flexible portion 620 is arranged to the outermost side of the substrate 600 . As an example, the flexible portion 620 may be the outermost side of the substrate 600 . The outermost side of the substrate 600 may refer to the opposite side of the side of the substrate 600 that is opposite to the side of the housing 120 . Alternatively, the outermost side of the substrate 600 may refer to the side opposite to the inner side of the housing 110 .

A plurality of copper foil patterns are laminated and embedded in the rigid portion 610 of the substrate 600 to form a plurality of coils.

The side surface of the housing 120 is provided with openings so that the first driving coil 430 and the first sensing coil 470 of the focus adjustment unit 400 and the second driving coils 510b and 520b and the second sensing coil 530b of the shake correction unit 500 can be inserted .

That is, the rigid portion 610 of the substrate 600 is inserted into the opening provided on the side surface of the case 120 . In addition, the flexible portion 620 of the substrate 600 is attached to the side surface of the housing 120 .

As shown in FIG. 5 , the flexible portion 620 of the substrate 600 constitutes the outermost surface of the substrate 600 . That is, the flexible portion 620 of the substrate 600 constitutes the outermost surface of the substrate 600 , so the rigid portion 610 of the substrate 600 can be inserted into the opening of the housing 120 , and the flexible portion 620 of the substrate 600 is attached to the side surface of the housing 120 .

When the flexible portion 620 is formed in the middle portion of the substrate 600 rather than the outermost side of the substrate 600 , the volume of the rigid portion 610 inserted into the housing 120 is limited, and as a result, the size of the coil embedded in the rigid portion 610 is also limited. become smaller.

Recently, the size of the camera module tends to be miniaturized, and the smaller the size of the camera module, the smaller the size of the coil. However, when the size of the coil is reduced, the magnitude of the driving force is also reduced, and the sensing sensitivity is also deteriorated, so there is a problem that the performance of the camera module is degraded. That is, there is a problem that it is difficult to satisfy both the miniaturization of the camera module and the improvement of the performance of the camera module.

However, in the camera module 100 according to an embodiment of the present invention, the flexible portion 620 is located on the outermost side of the substrate 600 , thereby increasing the volume of the rigid portion 610 inserted into the opening of the housing 120 , thereby increasing the thickness of the layers embedded in the rigid portion. The number of copper foil patterns of the part 610. Therefore, even if the size of the camera module 100 is reduced, a sufficient driving force can be ensured, and the sensing sensitivity can be improved. That is, the miniaturization of the camera module 100 and the improvement of the performance of the camera module 100 can be satisfied at the same time.

On the other hand, since the flexible portion 620 of the base plate 600 is attached to the side surface of the casing 120 , a reinforcing plate can be attached to the flexible portion 620 of the base plate 600 in order to increase the hardness.

The rigid portion 610 is formed by processing a copper foil pattern 640 on the first insulating layer 630 based on epoxy resin. As an example of the rigid portion 610, a copper foil laminate (Copper Clad Laminate, CCL) can be used.

The soft part 620 is attached to the outermost surface of the rigid part 610 . With reference to FIG. 5 , the flexible base film 660 and the copper foil 670 are laminated and processed on the lower portion of the rigid portion 610 to form the flexible portion 620 under the rigid portion 610 . The flexible base film 660 may be a polyimide film.

As an example of the flexible portion 620, a flexible copper clad laminate (FCCL) can be used.

The insulating layers 650 and 680 are respectively formed on the upper surface of the substrate 600 (ie, the upper surface of the rigid portion 610 ) and the lower surface of the substrate 600 (ie, the lower surface of the flexible portion 620 ).

After that, laser processing is performed on a specific position of the rigid portion 610 to form a cavity. Here, when laser processing is performed, the copper foil layer of the soft portion 620 functions as a stopper layer, so that only the hard portion 610 can be removed by the laser processing. Therefore, only the soft portion 620 remains in the laser-processed portion, so the substrate 600 is configured to be bendable or bendable.

On the other hand, when the flexible portion 620 is formed on the outermost surface of the substrate 600 using a flexible copper foil laminate, a circuit for connecting with the printed circuit board 720 can be designed in the flexible portion 620 .

Therefore, a circuit for connecting to the printed circuit board 720 can be formed in the flexible portion 620 in addition to the rigid portion 610 , so that the degree of freedom of design increases.

According to the above embodiments, the camera module of an embodiment of the present invention not only miniaturizes the camera module, but also ensures sufficient driving force, and on the other hand, can accurately measure the position of the lens barrel.

In the above, the structure and characteristics of the present invention have been described based on the embodiments of the present invention, but the present invention is not limited thereto, and those skilled in the technical field to which the present invention pertains should understand that the present invention can fall within the spirit and scope of the present invention. Various changes or deformations are made, and the above-mentioned changes or deformations belong to the scope of the appended invention application.

100‧‧‧Camera Module

110‧‧‧Shell

120‧‧‧Enclosure

210‧‧‧Lens barrel

300‧‧‧Carrier

301‧‧‧First guide groove

302‧‧‧The third guide groove

310‧‧‧Frame

311‧‧‧Second guide groove

320‧‧‧Lens holder

330‧‧‧stop

400‧‧‧Focus Adjustment Section

410, 510a, 520a‧‧‧Magnet

430‧‧‧First drive coil

450, 510c, 520c‧‧‧Yoke

470‧‧‧First Sensing Coil

470a, 470b‧‧‧coil

500‧‧‧Shake Correction

510b, 520b‧‧‧Second drive coil

530a‧‧‧Sensing yoke

530b‧‧‧Second sensing coil

600‧‧‧Substrate

700‧‧‧Image Sensor Module

710‧‧‧Image Sensor

720‧‧‧Printed circuit boards

B1‧‧‧Rolling element

B2‧‧‧First spherical member

B3‧‧‧Second Ball Member

B4‧‧‧The third ball member

Claims (14)

A camera module, comprising: a housing that accommodates a lens barrel and has an opening on a side surface; a focus adjustment portion that is configured to move the lens barrel along an optical axis direction; a shake correction portion that makes the lens The cylinder is configured to move in a direction perpendicular to the optical axis; and a substrate provides a drive signal to the focus adjustment portion and the shake correction portion, the substrate includes a rigid portion in which a plurality of copper foil patterns are laminated and embedded, and a substrate is formed. The flexible portion is formed on the outer surface of the rigid portion in a bendable manner, the rigid portion is inserted into the opening portion, and the flexible portion is attached to the housing. The camera module according to claim 1, wherein the flexible portion is a flexible copper foil laminate. The camera module according to claim 2, wherein the flexible portion constitutes an outermost side surface of the substrate. The camera module of claim 1, wherein the substrate is combined in a manner of covering four sides of the housing. The camera module of claim 1, wherein the focus adjustment part includes a carrier inserted into the housing so as to move along the optical axis direction together with the lens barrel, A magnet is arranged on one side, and a first driving coil and a first sensing coil are embedded in the rigid portion facing the magnet. The camera module of claim 5, wherein the first sensing coil includes two coils arranged along the optical axis direction, and can be adjusted according to the movement of the magnet along the optical axis direction The changing inductance changes to sense the position of the magnet in the direction of the optical axis. The camera module of claim 1, wherein the shake correcting part comprises: a frame that guides the lens barrel in such a way that the lens barrel moves along a first axis direction perpendicular to the optical axis; and A lens holder, on which the lens barrel is mounted, is guided in such a manner that the lens barrel moves in a second axis direction perpendicular to the first axis direction, and the frame is aligned with the lens barrel The lens holder is configured to move along the first axis direction, and the lens holder is configured to move along the first axis direction and the second axis direction together with the lens barrel. The camera module of claim 7, wherein magnets are respectively disposed on the first surface and the second surface of the lens holder, and a second driving coil is embedded in the rigid portion opposite to the magnets, A sensing yoke is arranged on the third surface of the lens holder, and a second sensing coil is embedded in the rigid portion opposite to the sensing yoke. The camera module of claim 8, wherein the second sensing coil comprises three coils arranged in a direction perpendicular to the optical axis, and can be arranged in a vertical direction according to the sensing yoke The position of the sensing yoke in the direction perpendicular to the optical axis is sensed by the inductance change that changes in the direction of the optical axis. A camera module, comprising: a carrier for accommodating a lens barrel and configured to move along an optical axis direction together with the lens barrel; a guide member disposed in the carrier to make the lens barrel move along the direction of the optical axis; The barrel is configured to move in a direction perpendicular to the optical axis, so as to guide the movement of the lens barrel; a focus adjustment part includes a magnet attached to the carrier; a shake correction part includes a magnet attached to the guide a plurality of magnets on different surfaces of the component; a base plate, which provides driving signals to the focus adjustment part and the shake correction part, the base plate includes: a rigid part, which is respectively connected to the Coils are laminated and embedded in positions where the magnet of the focus adjustment part and the plurality of magnets of the wobble correction part face each other; and a flexible part that forms the outermost surface of the substrate and includes a flexible copper foil laminate. The camera module according to claim 10, further comprising a casing that accommodates the carrier and has an opening formed on a side surface, the rigid portion is inserted into the opening, and the flexible portion is attached to the casing side. The camera module according to claim 10, wherein the soft part is combined in a manner of covering four sides of the casing. The camera module of claim 10, wherein the coil embedded in the rigid portion comprises: a first driving coil and a first sensing coil, which are opposite to the magnet of the focus adjustment portion ; and a second drive coil opposite to the plurality of magnets of the shake correction portion. The camera module of claim 10, wherein a sensing yoke is attached to the guide member, and the coil embedded in the rigid portion includes a second coil opposite to the sensing yoke sensing coil.

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