KR20200112780A - Motor for actuating lens - Google Patents

Abstract

According to an embodiment of the present invention, a lens operating motor is provided. The lens operating motor includes: a mover including a bobbin fixing a lens part; a stator moving the mover; a Hall sensor provided on an outer surface of the bobbin to sense the movement of the bobbin; an elastic member including a first elastic part having one end and the other end connected to one side of the bobbin and one side of the stator respectively, to apply power to the stator, and a second elastic part having one end and the other end connected to the other side of the bobbin and the other side of the stator respectively, to be elastically connected with the Hall sensor; and a substrate elastically connected with the elastic member. Therefore, the lens operating motor is capable of enabling the production of a camera module with improved reliability.

Description

Lens driving motor{MOTOR FOR ACTUATING LENS}

An embodiment of the present invention relates to a lens driving motor having an improved structure.

With the widespread use of various portable terminals and the commercialization of wireless Internet services, demands of consumers related to portable terminals are diversifying. Accordingly, various types of additional devices are installed in the portable terminals.

Among them, a typical camera module is a camera module that can take a photograph or video of a subject, store the image data, and edit and transmit it as necessary.

Recently, the demand for small-sized camera modules is increasing for various multimedia fields such as notebook personal computers, camera phones, PDAs, smart phones, toys, etc., and also for image input devices such as information terminals of surveillance cameras and video tape recorders. .

A conventional camera module has a magnet part on a mover, and a Hall sensor is attached to the stator so as to correspond to the magnet part to detect a change in a magnetic field when the mover moves and receive feedback.

However, such a conventional structure has limitations for arranging the Hall sensor, and a heavy magnet part is mounted on the moving mover, requiring a relatively large amount of power (power) to drive the mover, and electrically connecting the Hall sensor terminal to the substrate. A separate FPCB or complicated wiring structure was required to connect.

An embodiment is to provide a camera module with improved power saving, miniaturization and improved reliability for driving a lens.

An embodiment includes a mover including a bobbin fixing a lens unit, a stator supporting the mover, a Hall sensor provided on an outer surface of the bobbin to detect the movement of the bobbin, and one end of the bobbin and the stator An elastic member including a first elastic part having the other ends connected to each other to apply power to the stator, and a second elastic part having one end and the other end connected to the other sides of the bobbin and the stator and electrically connected to the Hall sensor. It provides a lens driving motor.

In addition, the first elastic part may be disposed above the bobbin, and the second elastic part may be disposed below the bobbin.

In addition, the first elastic part may be disposed below the bobbin, and the second elastic part may be disposed above the bobbin.

In addition, the first elastic portion and the second elastic portion may each include an outer portion fastened to the mover, an inner portion fastened to the bobbin, and a connection portion connecting the outer portion and the inner portion to provide an elastic force.

Further, the first elastic portion may be formed as a first spring and a second spring disposed to be spaced apart from each other.

In addition, the first spring and the second spring may be formed by bending terminals soldered to the substrate at respective outer portions.

In addition, the first spring and the second spring may be formed in the shape of a leaf spring symmetrical to each other.

In addition, the second elastic portion may be formed of at least two or more leaf springs to match the number of terminals provided in the hall sensor.

In addition, the second elastic portion may be formed in a mutually symmetrical shape.

In addition, the mover includes a coil part provided on an outer surface of the bobbin, and the stator supports a magnet part disposed at a position corresponding to the coil part, a housing fixing the magnet part, and the mover and the housing It may include a base that does.

On the other hand, the embodiment includes a mover including a bobbin for fixing a lens unit, a stator for moving the mover, a Hall sensor provided on an outer surface of the bobbin to detect movement of the bobbin, and at one side of the bobbin and the stator. An elastic member comprising a first elastic portion connected to one end and the other end to apply power to the stator, and a second elastic portion connected to the other end of the bobbin and the stator, and electrically connected to the Hall sensor. And, it is possible to provide a camera module including a substrate electrically connected to the elastic member, an image sensor provided on the substrate, and a cover can configured to form an exterior by receiving the mover and the stator.

In addition, the second elastic portion may be formed of at least two or more leaf springs to match the number of terminals provided in the hall sensor.

In addition, the first elastic portion may include a first spring disposed to be spaced apart from each other and two leaf springs formed as second springs.

According to an embodiment of the present invention, it is possible to achieve miniaturization by placing the Hall sensor directly on the mover, and furthermore, it is possible to achieve ageing rather than disposing a magnet on the conventional mover.

In addition, by using the elastic unit as an electrical connection member of the Hall sensor terminal, as a result, a camera module with improved reliability is implemented.

1 is a schematic side cross-sectional view of a lens driving motor according to an embodiment of the present invention.
Figure 2 is a perspective view of a second elastic portion according to an embodiment of the present invention.
3 is a perspective view of a first elastic part according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Unless otherwise defined, all terms in the present specification are the same as the general meanings of terms understood by those skilled in the art, and if terms used in the present specification conflict with the general meanings of the terms, the definitions used in the present specification are applied.

However, the invention to be described below is only for describing an embodiment of the present invention, not for limiting the scope of the present invention, and reference numerals used identically throughout the specification denote the same elements.

Hereinafter, referring to the drawings, a detailed description of the lens driving motor of the embodiment is as follows.

1 is a schematic side cross-sectional view of a lens driving motor according to an embodiment of the present invention, FIG. 2 is a perspective view of a second elastic part according to an embodiment of the present invention, and FIG. 3 is a first elasticity according to an embodiment of the present invention. It is a perspective view of wealth.

1 to 3, the lens driving motor 100 according to the embodiment may largely include a mover 110, a stator 120, a hall sensor 130, and an elastic unit 140. In addition, the embodiment may further include a cover can 150 and a substrate (not shown).

The cover can 150 is mounted on the base 123 by accommodating a mover 110, a stator 120, a hall sensor 130, and an elastic unit 140, which will be described later, to form the exterior of the lens driving motor 100 can do. In addition, the cover can 150 is mounted on the base 123 in close contact with the side surface of the base 123 to be described later, and protects internal components from external impacts and prevents penetration of external contaminants. You can also have

In addition, the cover can 150 must also perform a function of protecting components of the camera module from external radio wave interference generated by a mobile phone or the like. Accordingly, the cover can 150 may be formed of a metal material.

The cover can 150 may be implemented as the housing 122 itself, which will be described later, or may be fixed by molding the housing 122 inside. In an embodiment, an opening through which a lens unit (not shown) is exposed may be formed on an upper surface of the cover can 150.

The mover 110 includes a lens unit (not shown) and a bobbin 111, and may further include a coil unit 112.

The lens unit (not shown) may be a lens barrel, but is not limited thereto, and any holder structure capable of supporting the lens may be included. In the embodiment, a case where the lens unit is a lens barrel is described as an example. The lens unit is installed above the base 123 to be described later, and is disposed at a position corresponding to the image sensor. One or more lenses (not shown) are provided in the lens unit.

The bobbin 111 is coupled to the lens unit to fix the lens unit, and the coupling method of the lens unit and the bobbin 111 uses a thread coupling method in which a thread is formed on the inner circumferential surface of the bobbin 111 and the outer circumferential surface of the lens unit, respectively. Although it may be possible, it may be bonded by a screwless method using an adhesive. Of course, even in the threaded connection method, it is possible to achieve a more robust mounting to each other by using an adhesive after threading.

In addition, a guide part 111a for guiding the coil part 112 to be described later to be wound or mounted may be formed on the outer circumferential surface of the bobbin 111. The guide part 111a may be integrally formed with the outer surface of the bobbin 111, and may be continuously formed along the outer surface of the bobbin 111 or may be formed to be spaced apart at predetermined intervals.

In addition, a second elastic part 142 and/or a first elastic part provided on the upper side and/or the lower side of the bobbin 111 so that the bobbin 111 can be supported above the base 123 to be described later. A fastening protrusion to which the part 141 is fastened may be formed.

The coil part 112 may be guided by the guide part 111a to be wound on the outer surface of the bobbin 111, and a pre-wound coil part may be mounted on the guide part 111a. Alternatively, four individual coils may be disposed on the outer surface of the bobbin 111 at intervals of 90°. The coil unit 112 may form an electromagnetic field by receiving power applied from a substrate to be described later from the first elastic unit 141.

The stator 120 supports the mover 110 and may largely include a magnet part 121, a housing 122, and a base 123.

The magnet part 121 may be mounted on the housing 122 with an adhesive or the like so that the magnet part 121 may be disposed at a position corresponding to the outer surface of the coil part 112, and at four corners inside the housing 122 It may be mounted at equal intervals to facilitate efficient use of the internal volume, or may be mounted on four side surfaces of the housing 122 to face the coil unit 112.

The shape of the magnet may be a shape of each pillar, such as a triangular pillar shape, a square pillar shape, a trapezoid shape, etc., and may include some curves in the shape of the prism. In addition, during magnet processing, it may be processed into a partial curved surface at the edge of the magnet.

The housing 122 may be formed in a shape corresponding to the inner surface of the cover can 150 forming the exterior of the lens driving motor 100. In addition, the housing may be formed integrally with the cover can without a separate unit to form the exterior of the lens driving motor. In an embodiment, the upper and lower sides of the housing 122 or the cover can 150 are opened to have one end coupled to the elastic unit 140 to support the mover 110. Further, the housing 122 may include a magnet part fastening hole or fastening groove formed in a shape corresponding to the magnet part 121 at a side or corner.

In addition, the housing 122 may be formed of an insulating material, and may be formed as an injection product in consideration of productivity.

In addition, a stopper 122a capable of absorbing an impact may be formed on the upper surface of the housing 122 by protruding at a predetermined interval and contacting the upper surface of the cover can 150 when an external impact occurs. In addition, the stopper 122a may be integrally formed with the housing 122 or may be formed on a bobbin.

The base 123 supports the mover 110 and/or the housing 122, and has a circular shape in the center so that the bobbin 111 can be spaced apart from each other, and a recess 123a recessed downward is A limiting protrusion 123b may be formed at the center of the recess part 123a to limit the downward movement of the bobbin 111.

This base 123 may perform a sensor holder function to protect an image sensor (not shown) to be described later, and in this case, a protrusion may be formed in a downward direction along the side of the base, and an IR filter (not shown) It can be provided for positioning.

In this case, the IR filter may be mounted in a through hole formed in the center of the base 123, and an infrared filter or a blue filter may be provided. In addition, the IR filter may be formed of, for example, a film material or a glass material, and an infrared blocking coating material may be disposed on a flat optical filter such as a cover glass or cover glass for protecting an imaging surface. In addition, a separate sensor holder may be positioned under the base 123 in addition to the base 123.

In addition, the base 123 may be formed with one or more fixing protrusions protruding from the upper edge and interfacing with or engaging with the inner surface of the cover can 150, and such fixing protrusions are fastened to the cover can 150 It is easy to guide and at the same time make it possible to secure a firm fixation after fastening.

That is, the stator 120 according to the embodiment fixes the mover 110 to be positioned therein, and adjusts the focus of the image by moving the lens unit.

The Hall sensor 130 senses a change in the magnetic field of the magnet part 121 to detect the movement of the mover 110 and is provided to precisely control the actuator. In an embodiment, the Hall sensor 130 is provided on the outer surface of the bobbin 111 and senses a change in the magnetic field of the magnet part 121 disposed in the housing 122, and there is one Hall sensor 130 It may be provided above. Accordingly, in the embodiment, by arranging the magnet part 121 on the stator 120, it is possible to reduce the weight of the mover 110 and to reduce the power of the lens driving accordingly, and the lens driving motor 100 can be miniaturized. . In addition, the Hall sensor may be disposed in a groove formed in a part of the outer surface of the bobbin. In addition, a coil part may be disposed on the outer surface of the bobbin so that the Hall sensor may be disposed inside the coil part. The Hall sensor may be covered by the coil and may not be visible from the outside. In addition, the Hall sensor may be disposed outside the coil unit.

As shown, the Hall sensor 130 is implemented as four terminals (+ electrode,-electrode, ground, and output), but the terminals of the Hall sensor 130 are variable according to the type of the Hall sensor 130. Can be. Accordingly, the second elastic part 142 to be described later may be formed of at least two or more leaf springs to match the number of terminals of the Hall sensor 130.

The Hall sensor 130 is provided adjacent to the coil unit 112 than the magnet unit 121, but considering that the strength of the magnetic field formed in the magnet is several hundred times greater than the strength of the electromagnetic field formed in the coil, the mover ( The influence of the coil unit 112 in detecting the movement of 110) is not considered.

The elastic unit 140 may include a first elastic portion 141 and a second elastic portion 142.

The first elastic part 141 has one end and the other end connected to one side of the bobbin 111 and the stator 120, respectively, so that power may be applied to the coil part of the stator 120. In addition, the second elastic portion 142 may have one end and the other end connected to the other side of the bobbin 111 and the stator 120, respectively, so that the second elastic part 142 may be electrically connected to the hall sensor 130.

Here, the first elastic portion 141 and the second elastic portion 142 may be formed of separate springs disposed at each side of the housing 122, but the plate material is bent and cut for production efficiency. It may be formed in a leaf spring shape.

The one side may be an upper side or a lower side of the bobbin 111 and the stator 120. Similarly, the other side may be the lower side or the upper side of the bobbin 111 and the stator 120. In short, the first elastic part 141 is disposed above the bobbin 111 and the second elastic part 142 is disposed below the bobbin 111, or the first elastic part 141 is a bobbin ( 111) and the second elastic part 142 may be disposed on the upper side of the bobbin 111.

In the drawing, since the first elastic part 141 is disposed under the bobbin 111 and the second elastic part 142 is disposed above the bobbin 111, it will be described below based on this.

2 or 3, the first elastic part 141 and the second elastic part 142 each have a substantially ring shape, and the inner circumference may be formed in a substantially circular shape to correspond to the shape of the moving part. , The outer periphery may have a substantially rectangular shape to be supported by the shape of the housing 122 or the base 123.

Specifically, the first elastic part 141 and the second elastic part 142 are each of the outer parts 141a and 142a fastened to the mover 110 and the bobbin 111 so as to be fastened to the bobbin 111. It may include inner portions 141b and 142b in which fastening holes corresponding to the fastening protrusions are formed, and connection portions 141c and 142c that connect the outer portions 141a and 142a and the inner portions 141b and 142b to provide elasticity. As shown, the connection portions 141c and 142c may be formed of one or more bent portions in which the inner portion 141b is integrally formed between the inner portions.

The outer portion 141a of the first elastic portion 141 is disposed between the lower end of the housing 122 and the base 123 or on the base 123, and the inner portion 141b is a lower surface of the bobbin 111 It is fastened to and supports the bobbin 111 and may provide a return force to the bobbin 111.

In addition, the first elastic portion 141 may be formed as a first spring 141aa and a second spring 141bb disposed to be spaced apart from each other, so that power applied from a substrate to be described later may be introduced or output.

The first spring 141aa and the second spring 141bb may be formed as a leaf spring shape in a mutually symmetrical shape, and may be formed as a single leaf spring, but are formed as separate leaf springs for input/output of power. It is desirable.

In addition, the first spring 141aa and the second spring 141bb may be formed by bending a terminal 141d soldered to the substrate at each of the outer portions 141a and 142a. In short, one end and the other end of the coil part 112 wound on the bobbin 111 are electrically connected to inner parts of the first spring 141aa and the second spring 141bb, respectively, and the first spring 141aa ) And the terminals 141d formed on the second springs 141bb, respectively, are fixed to the side surfaces of the base 123 and are electrically connected to a substrate to be described later.

Meanwhile, the second elastic part 142 may be formed of at least two or more leaf springs so as to match the number of terminals provided in the Hall sensor 130 to be described later, and in the embodiment, the terminals of the Hall sensor 130 Since it is formed of four, the second elastic portion 142 may be divided into four and provided to be spaced apart from each other in a symmetrical shape.

That is, the individual leaf springs 142aa, 142bb, 142cc, 142dd of the divided second elastic portion 142, each inner portion 142b is individually electrically connected to the Hall sensor 130, and each outer portion ( 142a) may be electrically connected to a substrate to be described later by an electric wire (not shown) or a metallic member (not shown) provided outside the housing 122 or a surface metal layer formed on the housing.

In an embodiment, that each component is electrically connected may be implemented as a soldering method.

On the other hand, the lens driving motor 100 according to the embodiment may be mounted on a camera module, and such a camera module includes a variety of multimedia fields such as mobile phones or notebook personal computers, camera phones, PDAs, smarts, toys, etc. Furthermore, it may be provided in an image input device such as an information terminal of a surveillance camera or a video tape recorder.

In short, when the lens driving motor 100 according to the embodiment is provided in a camera module, the camera module is not shown, but may further include a printed circuit board and an image sensor.

The printed circuit board (not shown) has an image sensor (not shown) mounted in the center of the upper side, and various devices (not shown) for driving the camera module may be mounted. In addition, the printed circuit board is the coil unit 112 through the terminals 141c and 141d of the first elastic unit 141 to apply power for driving the lens driving motor 100 according to the embodiment. Is electrically connected to

The image sensor (not shown) may be mounted in the center of the upper side of the printed circuit board so that it can be positioned along the optical axis direction with one or more lenses (not shown) accommodated in the lens unit. Such an image sensor converts an optical signal of an object incident through the lens into an electrical signal.

From the above description, those skilled in the art will recognize that various changes and modifications can be made without departing from the technical spirit of the present invention, and the technical scope of the present invention is not limited to the contents described in the embodiments, but claims It should be determined according to the scope and the scope equivalent thereto.

100: lens driving motor 110: mover
111: bobbin 112: coil unit
120: stator 121: magnet portion
122: housing 123: base
130: hall sensor 140: elastic unit
141: first elastic part 141aa: first spring
141bb: second spring 141d: terminal
142: second elastic portion 141a, 142a: outer portion
141b, 142b: inner part 141c, 142c: connection part

Claims (30)

Bobbin; And a mover including a coil unit disposed on the bobbin.
A magnet part facing the coil part; And a stator including a housing in which the magnet part is disposed.
At least one Hall sensor disposed on an outer surface of the bobbin to detect displacement of the bobbin; And
A camera module including an upper elastic member connected to an upper surface of the bobbin and an upper surface of the housing. The method of claim 1,
The upper elastic member is a camera module including four upper elastic units electrically spaced apart from each other. The method of claim 2,
A camera module including a cover can for accommodating the mover, the stator, the at least one hall sensor, and the upper elastic member. The method of claim 2,
A camera module including a lower elastic member coupled to a lower surface of the bobbin and a lower surface of the housing. The method of claim 4,
Each of the lower elastic member and the upper elastic member
An outer portion coupled to the housing;
An inner portion coupled to the bobbin; And
A camera module comprising a connection portion connecting the outer portion and the inner portion. The method of claim 3,
The stator is a camera module including a base that supports at least one of the mover and the housing. The method of claim 2,
Each of the at least one Hall sensor and the coil unit is disposed on an outer surface of the bobbin,
The at least one Hall sensor is a camera module disposed outside the coil unit. The method of claim 7, wherein the bobbin comprises a groove in which the at least one Hall sensor is disposed,
The groove portion is a camera module formed on a part of the outer surface of the bobbin. The method of claim 2,
The camera module includes four magnet portions disposed to face the coil portion on four side surfaces of the housing. The camera module of claim 9, wherein the housing includes a fastening hole having a shape corresponding to the four magnet parts or a side surface having a fastening groove formed thereon. The method of claim 2,
The four upper elastic units are formed in a mutually symmetrical shape camera module. The method of claim 2,
The at least one Hall sensor is a camera module disposed adjacent to the coil part rather than the magnet part. The camera module of claim 2, wherein the magnet part is attached to the housing by an adhesive. The method of claim 2,
A lower elastic member coupled to a lower surface of the bobbin and a lower surface of the housing, respectively,
The lower elastic member includes two lower elastic units spaced apart from each other,
The two lower elastic units are a camera module electrically connected to the coil unit. The method of claim 3,
A camera module including a stopper protruding at predetermined intervals from an upper surface of the housing or the bobbin toward the cover can. The method of claim 6,
The base includes one or more fixing protrusions to be interviewed or coupled with the inner surface of the cover can,
The camera module is formed by protruding from the upper edge of the base. The method of claim 5,
The four upper elastic units are formed by leaf springs matching the number of terminals provided in the at least one hall sensor, and are electrically connected to the four terminals of the at least one hall sensor, respectively. The method of claim 17,
The inner portion of each of the four upper elastic units is individually electrically connected to the four terminals provided in the at least one hall sensor,
The outer portion of each of the four upper elastic units is electrically connected to four wires provided outside the housing. The method of claim 6,
The base has a circular shape in the center and includes a recess formed by concave downward,
A camera module in which a limiting protrusion is formed in the center of the recess to limit the downward movement of the bobbin. The method of claim 5,
The lower elastic member includes a first spring and a second spring disposed to be spaced apart from each other,
The first spring and the second spring are electrically connected to the coil unit. The method of claim 20,
Board; And
Including an image sensor provided on the substrate,
The first spring and the second spring are formed by bending terminals soldered to the substrate at each of the outer portions. The method of claim 20,
The first spring and the second spring are formed in a leaf spring shape symmetrical to each other. The method of claim 21,
The inner portions of each of the first spring and the second spring are electrically connected to one end and the other end of the coil unit, respectively,
The terminal of each of the first spring and the second spring is electrically connected to the substrate by an electric wire or a metallic member. A bobbin in which a lens unit is disposed; And a mover including a coil unit disposed on the bobbin.
A magnet portion supporting the mover and facing the coil portion; And a stator including a housing in which the magnet part is disposed.
A camera module including an upper elastic member having one end connected to the other side of the bobbin and the other end connected to the other side of the stator. 25. The camera module of claim 24, wherein an outer peripheral surface of the bobbin guides winding or mounting of the coil unit and includes a guide unit formed on an outer surface of the bobbin. The method of claim 24,
A camera module having one end connected to one side of the bobbin and the other end connected to one side of the stator, and comprising a lower elastic member disposed under the bobbin. The method of claim 26,
Each of the lower elastic member and the upper elastic member
An outer portion fastened to the housing;
An inner part fastened to the bobbin; And
A camera module comprising a connection portion connecting the outer portion and the inner portion. The method of claim 24,
The stator further includes a base supporting the mover and the housing. 25. The camera module of claim 24, wherein the magnet portion includes four magnet portions disposed to face the coil portion on four side surfaces of the housing. The camera module of claim 29, wherein the housing includes a fastening hole having a shape corresponding to the four magnet parts or a side surface having a fastening groove formed therein.

Images