TECHNICAL FIELD

Embodiments relate to a lens driving unit, a camera module, and an optical appliance.

BACKGROUND

The following disclosure merely provides background information related to the embodiments and does not describe the related art.

As various kinds of portable terminals have become widely generalized and popularized and wireless Internet service is commercialized, consumer demand related to portable terminals has been diversified, and therefore various kinds of additional devices have been mounted to portable terminals.

A representative one of these additional devices is a camera module that captures a still or moving image of an object.

Recent camera modules include an Optical Image Stabilization (OIS) actuator for a hand tremor compensation function, and there is need for a reduced height of the entire module and a simplified manufacturing process thereof.

Conventional camera modules have a high price and a large number of manufacturing processes due to the great number of elements thereof, and an increase in process management points upon the manufacture of a product results in increased manufacturing costs and an increased height of the entire product.

In addition, because a printed circuit board and a circuit member have different sizes, the printed circuit board may be warped when the circuit member is assembled to one surface of the printed circuit board, which deteriorates the quality of the camera module.

In addition, a gap may be generated between a pad unit provided on one surface of the printed circuit board and a base to which the printed circuit board is assembled, thus causing contact failure.

In addition, when only the pad unit is provided on one surface of the printed circuit board, a portion of a pad may be separated from the printed circuit board during soldering, which causes deterioration in the quality of the camera module.

In addition, the printed circuit board may be provided on one surface of the base and the circuit member may be provided on one surface of the printed circuit board. When the base, the printed circuit board, and the circuit member are sequentially assembled with one another, the circuit member does not come into contact with the base, which may make the height of the circuit member uneven.

In addition, when a pattern, which protrudes from the pad provided on one surface of the printed circuit board, is thin, the pad may be cracked by an external shock.

The circuit member may be assembled so as to be disposed on the upper surface of the printed circuit board.

In the process of assembling the circuit member so as to be disposed on the top of the printed circuit board, the circuit member may be slightly tilted.

When the circuit member is tilted, rather than being evenly disposed on the upper surface of the printed circuit board, the resolution of the camera module may be deteriorated.

In addition, because a conventional lens driving apparatus is configured such that the circuit member and the printed circuit board are assembled with each other, rather than integrally forming the circuit member and the printed circuit board, a foreign substance may be introduced between the circuit member and the printed circuit board, thus causing deterioration in the resolution of the camera module.

BRIEF SUMMARY

Embodiments provide a lens driving unit, which achieves a reduction in the number of elements, the number of processes, the number of process management points, and the height of an entire product.

In addition, embodiments provide a camera module and an optical appliance, each of which includes a lens driving unit.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit deterioration in the quality of the camera module due to warping of a printed circuit board, which is caused when a circuit member is assembled to one surface of the printed circuit board because the printed circuit board and the circuit member have different sizes.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit contact failure due to a gap between a pad unit provided on one surface of a printed circuit board and a base to which the printed circuit board is assembled.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit deterioration in the quality of the camera module due to the separation of a portion of a pad from a printed circuit board during soldering in the case where only a pad unit is provided on one surface of the printed circuit board.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit a circuit member from having an irregular height because it does not come into contact with a base when the circuit member, the base, and a printed circuit board are sequentially assembled with one another so that the printed circuit board is provided on one surface of the base and the circuit member is provided on one surface of the printed circuit board.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit a pattern, which protrudes from a pad provided on one surface of a printed circuit board, from being cracked by an external shock when the pattern is thin.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit a circuit member from being slightly tilted in the process of assembling the circuit member so as to be disposed on the top of a printed circuit board.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit deterioration in the resolution of the camera module when a circuit member is tilted, rather than being evenly disposed on the upper surface of a printed circuit board.

In addition, embodiments provide a lens driving apparatus and a camera module including the same, which may inhibit deterioration in the resolution of the camera module due to the introduction of a foreign substance between a circuit member and a printed circuit board because the circuit member and the printed circuit board are assembled with each other, rather than being integrally formed with each other.

In one embodiment, a lens driving unit includes a base, a housing supported so as to be movable relative to the base, a magnet located on the housing, a pattern coil part including a pattern coil that is located opposite the magnet, the pattern coil part being located on the base, and a sensor part mounted to the pattern coil part for sensing a position or movement of the housing, wherein the pattern coil part includes a first layer and a second layer stacked on the first layer, the sensor part being mounted underneath the first layer, and the pattern coil being formed on the second layer.

The pattern coil part may include a body provided with the pattern coil, and a terminal portion bent from the body so as to extend downward.

The sensor part may be located so as not to overlap the pattern coil in an optical-axis direction.

The body may include a through-hole formed in a center thereof, the pattern coil may include first to fourth coil pieces located around the through-hole, the first coil piece and the third coil piece may be located opposite each other, and the second coil piece and the fourth coil piece may be located opposite each other. The first coil piece and the second coil piece may have the same shape, and the third coil piece and the fourth coil piece may have the same shape. The first coil piece and the third coil piece may have different shapes.

The sensor part may be located so as to overlap the pattern coil in an optical-axis direction, and the pattern coil part may further include a third layer located between the first layer and the second layer.

The base or the body may support the housing from a bottom side thereof so that the housing is horizontally moved or tilted.

The lens driving unit may further include a lateral support member coupled at one end thereof to the housing, and the lateral support member may have a remaining end coupled to the body.

The lateral support member may include a wire, and the body may include a coupling hole for penetration of the wire, and an electrical conduction portion formed on a lower surface of the body so as to come into contact with the coupling hole.

The base may include a sensor part accommodation recess formed in an upper surface thereof for accommodating therein the sensor part.

The sensor part may include a hall sensor for sensing magnetic force of the magnet, and the hall sensor may be mounted to the pattern coil part via a Surface Mount Technology (SMT).

The lens driving unit may further include a bobbin located inside the housing, a coil located on the bobbin so as to be opposite the magnet, and an upper support member and a lower support member that are coupled to the bobbin and the housing for supporting the bobbin so as to be movable relative to the housing.

The upper support member may be divided into six upper electrical conduction parts, and the lower support member may be divided into two lower electrical conduction parts. Four electrical conduction parts among the six upper electrical conduction parts may conduct electricity together with an auto-focusing feedback sensor located on the bobbin, and two remaining electrical conduction parts among the six upper electrical conduction parts may be connected to the two lower electrical conduction parts via an electrical conduction member so as to conduct electricity together with the coil located on the bobbin.

The lens driving unit may further include a cover member for accommodating therein the housing, the cover member having a lower end coupled to the base, and the cover member may include a cutaway portion for exposing the terminal portion to an outside.

The terminal portion may be accommodated in a terminal accommodation portion formed in a portion of a side surface of the base.

The terminal portion may be located on each of opposite lateral sides of the body.

In another embodiment, a camera module includes a base, a housing supported so as to be movable relative to the base, a magnet located on the housing, a pattern coil part including a pattern coil that is located opposite the magnet, the pattern coil part being located on the base, and a sensor part mounted to the pattern coil part for sensing a position or movement of the housing, wherein the pattern coil part includes a first layer and a second layer stacked on the first layer, the sensor part being mounted underneath the first layer, and the pattern coil being formed on the second layer.

In another embodiment, an optical appliance includes a main body, a display unit disposed on one surface of the main body for displaying information, and a camera module installed to the main body for capturing an image or photograph, wherein the camera module includes a base, a housing supported so as to be movable relative to the base, a magnet located on the housing, a pattern coil part including a pattern coil that is located opposite the magnet, the pattern coil part being located on the base, and a sensor part mounted to the pattern coil part for sensing a position or movement of the housing, wherein the pattern coil part includes a first layer and a second layer stacked on the first layer, the sensor part being mounted underneath the first layer, and the pattern coil being formed on the second layer.

In another embodiment, a lens driving apparatus includes a first lens driving unit including a bobbin provided with at least one lens sheet therein and a first coil on an outer circumferential surface thereof, a first magnet located around the bobbin so as to be opposite the first coil, a housing for supporting the first magnet, and upper and lower elastic members that are coupled to the bobbin and the housing, the first lens driving unit moving the bobbin in a first direction, which is parallel to an optical axis, via interaction between the first magnet and the first coil, and a second lens driving unit including a base spaced apart from the first lens driving unit by a predetermined distance, a plurality of support members for supporting the housing so as to be movable relative to the base in second and third directions, which are orthogonal to the first direction, a second coil located so as to be opposite the first magnet, and a printed circuit board disposed on one surface of the base via an adhesive member, the second lens driving unit moving the housing in the second and third directions via interaction between the first magnet and the second coil, wherein the printed circuit board includes a plurality of terminals provided on one surface thereof, and a coating member for covering a portion of opposite side surfaces of each of the terminals.

The terminals may be spaced apart from one another by a first length on the surface of the printed circuit board.

The first length may range from 0.01 μm to 0.45 μm.

The coating member may be integrally provided on one surface of two or more of the terminals.

The terminals may include first terminals located on opposite ends of the printed circuit board, and a second terminal located between the first terminals.

The coating member may be provided to cover one side surface of each first terminal and opposite side surfaces of the second terminal.

The coating member may be formed of a Photo Solder Resist (PSR) or cover layer material.

The printed circuit board may have a hollow shape and may include at least one protruding hollowed portion, which protrudes radially outward from a center of the printed circuit board.

The lens driving apparatus may further include a circuit member having the second coil, and the circuit member may have the same diagonal length in the first direction as the diagonal length of the printed circuit board in the first direction.

The circuit member may have the same diagonal length in the second direction, which crosses the first direction, as the diagonal length of the printed circuit board in the second direction.

In another embodiment, a camera module includes a lens driving apparatus, the lens driving apparatus including a first lens driving unit including a bobbin provided with at least one lens sheet therein and a first coil on an outer circumferential surface thereof, a first magnet located around the bobbin so as to be opposite the first coil, a housing for supporting the first magnet, and upper and lower elastic members that are coupled to the bobbin and the housing, the first lens driving unit moving the bobbin in a first direction, which is parallel to an optical axis, via interaction between the first magnet and the first coil, and a second lens driving unit including a base spaced apart from the first lens driving unit by a predetermined distance, a plurality of support members for supporting the housing so as to be movable relative to the base in second and third directions, which are orthogonal to the first direction, a second coil located so as to be opposite the first magnet, and a printed circuit board disposed on one surface of the base via an adhesive member, the second lens driving unit moving the housing in the second and third directions via interaction between the first magnet and the second coil, wherein the printed circuit board includes a plurality of terminals provided on one surface thereof, and a coating member for covering a portion of opposite side surfaces of each of the terminals, an image sensor, and a circuit board on which the image sensor is mounted.

The terminal may have a thickness of 400 μm or more.

The printed circuit board may have a hollow shape and may include at least one protruding hollowed portion, which protrudes radially outward from a center of the printed circuit board.

The lens driving apparatus may further include a circuit member having the second coil, and the circuit member may have the same diagonal length in the first direction as the diagonal length of the printed circuit board in the first direction.

The coating member may be formed of a Photo Solder Resist (PSR) or cover layer material.

The coating member may be provided to cover a portion of an upper surface of each terminal.

In another embodiment, a lens driving apparatus includes a first lens driving unit including a bobbin provided with at least one lens sheet therein and a first coil on an outer circumferential surface thereof, a first magnet located around the bobbin so as to be opposite the first coil, a housing for supporting the first magnet, and upper and lower elastic members that are coupled to the bobbin and the housing, the first lens driving unit moving the bobbin in a first direction that follows an optical axis via interaction between the first magnet and the first coil, and a second lens driving unit including a base spaced apart from the first lens driving unit by a predetermined distance, a plurality of support members for supporting the housing so as to be movable relative to the base in second and third directions, which are orthogonal to the first direction, a second coil located so as to be opposite the first magnet, and a circuit member disposed on one surface of the base via an adhesive member, the second lens driving unit moving the housing in the second and third directions via interaction between the first magnet and the second coil, wherein the circuit member includes a first circuit board unit including at least one pattern for electrically connecting the circuit member and a controller to each other, a second circuit board unit disposed on a top of the first circuit board unit, and a third circuit board unit disposed on a bottom of the first circuit board unit, and wherein each of the first circuit board unit, the second circuit board unit, and the third circuit board unit includes the second coil, such that the circuit member and the second coil are integrally formed with each other.

The first circuit board unit may include a plurality of circuit boards, and may further include a terminal that is electrically connected to the controller.

Each of the second circuit board unit and the third circuit board unit may include at least one circuit board.

No second coil may be formed on a lowermost circuit board of the third circuit board unit, and a position sensor may be mounted on a portion corresponding to a position of the second coil.

Each of the second coils provided on the first circuit board unit, the second circuit board unit, and the third circuit board unit may be wound to have five turns or more.

The circuit member may include at least six circuit boards.

One of the six circuit boards may include no second coil, and may include a position sensor on a portion thereof corresponding to a position of the second coil.

The circuit boards may be formed of a Flexible Printed Circuit Board (FPCB).

In another embodiment, a camera module may include the lens driving apparatus of the above embodiment, the image sensor, and a sensor board on which the image sensor is mounted.

In a further embodiment, the lens driving apparatus includes a first lens driving unit including a bobbin provided with at least one lens sheet therein and a first coil on an outer circumferential surface thereof, a first magnet located around the bobbin so as to be opposite the first coil, a housing for supporting the first magnet, and upper and lower elastic members that are coupled to the bobbin and the housing, the first lens driving unit moving the bobbin in a first direction that follows an optical axis via interaction between the first magnet and the first coil, and a second lens driving unit including a base spaced apart from the first lens driving unit by a predetermined distance, a plurality of support members for supporting the housing so as to be movable relative to the base in second and third directions, which are orthogonal to the first direction, a circuit member disposed on one surface of the base via an adhesive member, a circuit board unit disposed on a lower surface of the circuit member, and a second coil wound on the circuit member and/or the circuit board unit, the second lens driving unit moving the housing in the second and third directions via interaction between the first magnet and the second coil, and the circuit board unit and the circuit member being integrally formed with each other.

The circuit board unit may include a first circuit board unit including at least one pattern for electrically connecting the circuit board unit and a controller to each other, and a second circuit board unit disposed on the first circuit board unit.

The circuit member may include a first circuit member, a second circuit member located below the first circuit member, a third circuit member located below the second circuit member, and a fourth circuit member located below the third circuit member.

The circuit board unit may be located between the second circuit member and the third circuit member.

No second coil may be wound on at least one of the circuit members.

