Lens driving device

Abstract

A lens driving device according to an embodiment of the present invention has a structure in which an FPCB for transmitting power and an operation signal to an aperture driving unit is connected to a lens barrel moving body, a fixed body, or an elastic spring for autofocusing, and thus may stably transmit operation power and a control signal to an aperture driving module even when the moving body on which the aperture driving module is mounted frequently moves.

Description

Lens drive unit

[0001] The present invention relates to a lens driving device, and more particularly, to a lens driving device having a structure in which an FPCB for transmitting power and an operation signal to an aperture driving unit is connected to a lens barrel moving body or a fixed body or an elastic spring for autofocus adjustment, and a camera device including the same.

[0002] A mobile device equipped with a lens is equipped with an aperture (IRIS) that controls the amount of light entering, similar to the human iris. This aperture is usually driven by an external power source.

[0003] In a camera module, the lens is not implemented in a form fixed to a specific member, but is mainly mounted on a moving body that moves in the direction of the optical axis or in a direction perpendicular to the optical axis, and drive units driven by externally applied power are mounted inside the moving body.

[0004] The lens drive module must include a configuration that supplies external power to the drive units mounted within a continuously moving moving object. To supply power, etc. within the moving object, a method of connecting an electrical line between the external environment and the moving object, the length of which takes into account the moving object's travel distance, is commonly used. However, the frequent movement of the moving object can easily lead to disconnection of the line.

[0005] In addition, when connecting the external and mobile objects with simple wiring, there is a problem that the precise movement of the mobile object may be hindered by the load and tension of the wiring, and the tilt of the mobile object may easily occur.

[0006] The purpose of the present invention is to provide a lens driving device capable of stably interfacing driving power and control signals to an aperture driving module.

[0007] Another object of the present invention is to provide a lens driving device capable of stably transmitting driving power and control signals to an aperture driving module without a break even when a mobile body equipped with an aperture driving module moves frequently.

[0008] According to one embodiment of the present invention for achieving the above object, a lens driving device comprises: an aperture driving module (200) driven by an applied power source and a control signal; a housing (300) accommodating a printed circuit board for controlling the operation of the aperture driving module; and an FPCB (100) having a first terminal at one end connected to the aperture driving module (200) through a connection line (CL) at a position corresponding to a first side (S1) of the housing, and a second terminal at the other end connected to the printed circuit board arranged at a second side adjacent to the first side of the housing to interface an external power source or an electrical signal to the aperture driving module.

[0009] In a lens driving device according to one embodiment of the present invention, the FPCB includes: a first portion (110) that is bent from a connection portion (110s) connected to the connection line (CL) and extends parallel to a first side surface (S1) of the housing; a second portion (120) that is bent and extends from an end portion (110e) of the first portion toward a second side surface (S2) of the housing at a predetermined angle with the first side surface (S1) of the housing; a third portion (130) that is bent from an end portion (120e) of the second portion toward the second side surface (S2) of the housing; and a fourth portion (140) that is bent from an end portion (120e) of the third portion toward the second side surface (S2) of the housing and then is bent downward in the optical axis direction and extends along the second side surface (S2) of the housing toward the first side surface (S1) of the housing. And it can be formed by including a fifth part (150) that is bent downward in the optical axis direction at the end portion (140e) of the fourth part and connected to the printed circuit board.

[0010] In a lens driving device according to one embodiment of the present invention, the first to fourth parts may have the same width.

[0011] In a lens driving device according to one embodiment of the present invention, the length of the fourth part may be formed to be longer than the length of the third part.

[0012] In a lens driving device according to one embodiment of the present invention, an FPCB includes a first line connected to ground; a second line transmitting operating power of the aperture driving module; a first signal line (SDA) for data communication required for controlling the operation of the aperture driving module; and a second signal line (SCL) providing a timing synchronization clock for controlling the operation of the aperture driving module.

[0013] In a lens driving device according to one embodiment of the present invention, the terminal portion of the fifth part includes a plurality of terminals for connecting to the printed circuit board.

[0014] According to another embodiment of the present invention, a lens driving device comprises: a housing including a printed circuit board therein; a bobbin disposed within the housing and reciprocating in the direction of an optical axis; a lens module mounted on the bobbin; an aperture portion disposed above the lens module and having an aperture that varies in response to an applied control signal; an upper elastic member divided into a plurality of pieces and coupled to the bobbin and the housing to elastically support movement of the bobbin in a direction parallel to the optical axis; a signal transmission portion having one end connected to one side of the aperture portion and the other end connected to the elastic member to transmit power and a control signal provided through the elastic member to the aperture portion; and an OIS wire connected between the printed circuit board within the housing and the upper elastic member to transmit the aperture power and the aperture control signal from the printed circuit board to the elastic member.

[0015] In another embodiment of the lens driving device of the present invention, the signal transmission unit may be soldered to the aperture unit.

[0016] In another embodiment of the lens driving device of the present invention, the upper elastic member comprises first to fourth upper elastic members that are divided from each other.

[0017] In a lens driving device according to another embodiment of the present invention, the signal transmission unit may include a first signal transmission unit that transmits aperture unit operation power to the aperture unit and a second signal transmission unit that transmits an operation control signal to the aperture unit.

[0018] In another embodiment of the lens driving device according to the present invention, a first signal transmission unit is connected to a first upper elastic member and a second upper elastic member spaced apart from the first upper elastic member in an aperture portion of an area adjacent to a first side of a housing, and receives operating power of the aperture portion from the first upper elastic member and the second upper elastic member and transmits the power to the aperture portion, and a second signal transmission unit is connected to a third upper elastic member and a fourth upper elastic member spaced apart from the third upper elastic member in an aperture portion of an area adjacent to a third side of the housing opposite to the first side of the housing, and receives an operating control signal of the aperture portion from the third upper elastic member and the fourth upper elastic member and transmits the signal to the aperture portion.

[0019] It may include a first signal transmission unit that transmits aperture unit operation power to the aperture unit and a second signal transmission unit that transmits an operation control signal to the aperture unit.

[0020] In a lens driving device according to another embodiment of the present invention, the first signal transmission unit may be positioned symmetrically with respect to the second signal transmission unit with respect to the lens module.

[0021] In a lens driving device according to another embodiment of the present invention, the plurality of OIS wires are respectively connected to the first to fourth upper elastic members at each corner of the housing.

[0022] The lens driving device according to the present invention can stably transmit operating power and control signals to the aperture driving module even if a moving body equipped with the aperture driving module moves frequently.

[0023] FIG. 1 is a perspective view showing a lens driving device according to one embodiment of the present invention.

[0024] Figure 2 is an exploded perspective view of a lens driving device according to one embodiment of the present invention.

[0025] Figure 3 is a plan view of a lens driving device according to one embodiment of the present invention.

[0026] FIGS. 4 to 6 are exemplary diagrams showing an FPCB applied to a lens driving device according to an embodiment of the present invention.

[0027] FIG. 7 is a perspective view showing a lens driving device according to another embodiment of the present invention.

[0028] Figure 8 is an exploded perspective view of a lens driving device according to another embodiment of the present invention.

[0029] Figure 9 is a plan view of a lens driving device according to another embodiment of the present invention.

[0030] FIG. 10 is an exemplary diagram showing a plurality of upper elastic bodies and OIS wires for signal transmission applied to a lens driving device according to another embodiment of the present invention.

[0031] Fig. 11 is an exemplary diagram showing the connection state of an upper elastic body applied to a lens driving device according to another embodiment of the present invention.

[0032] With respect to the embodiments of the present invention disclosed in the text, specific structural and functional descriptions are merely exemplified for the purpose of explaining the embodiments of the present invention, and the embodiments of the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described in the text.

[0033] The present invention is susceptible to various modifications and takes various forms. Specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to specific disclosed forms, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0034] While terms like "first" and "second" may be used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0035] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but there may also be other components in between. Conversely, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", should be interpreted similarly. Similarly, "disposed on" can mean disposed directly on the surface of another component or disposed above the surface by a distance.

[0036] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" indicate the presence of a disclosed feature, number, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0037] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted to have a meaning consistent with their meaning in the context of the relevant technology, and shall not be construed in an idealized or overly formal sense unless explicitly defined herein.

[0038] Meanwhile, if a particular embodiment can be implemented differently, the functions or operations specified within a particular block may occur in a different order than specified in the flowchart. For example, two consecutive blocks may actually be performed substantially simultaneously, or, depending on the related functions or operations, the blocks may be performed in reverse order.

[0039] Hereinafter, a lens driving device according to the present invention will be described with reference to the attached drawings. Hereinafter, the lens driving device may be referred to as a lens driving unit, a VCM (Voice Coil Motor), an actuator, a lens moving device, etc., and the term "coil" may be referred to as a coil unit, and the term "elastic member" may be referred to as an elastic unit or a spring. In addition, in the following description, a "terminal" may be referred to as a pad, an electrode, a conductive layer, a bonding portion, etc.

[0040] FIG. 1 is a perspective view showing a lens driving device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a lens driving device according to an embodiment of the present invention, FIG. 3 is a plan view of a lens driving device according to an embodiment of the present invention, and FIGS. 4 to 6 are exemplary views showing an FPCB applied to a lens driving device according to an embodiment of the present invention.

[0041] The lens driving device according to the present invention comprises: an aperture driving module (200) driven to control the amount of light incident on a lens (210) by an applied power source and a control signal; a housing (300) accommodating a printed circuit board (not shown) for controlling the operation of the aperture driving module (200); a first terminal at one end is connected to the aperture driving module (200) through a connection line (CL) at a position corresponding to a first side (S1) of the housing; and a second terminal at the other end is connected to the printed circuit board arranged on a second side adjacent to the first side of the housing (300) to interface an external power source or an electrical signal to the aperture driving module (200).

[0042] The FPCB (100) is placed between two adjacent sides of the housing (300). For example, one end of the FPCB (100) is connected to a portion of the aperture driving module (200) at a first side (S1) of the housing (300), and the other end of the FPCB (100) is connected to a second side (S2) adjacent to the first side (S1) of the housing (300).

[0043] The above FPCB (100) can be broadly divided into five parts (110 to 150). The first part (110) is bent from the connection portion (110s) connected to the connection line (CL) toward the second side (S2) of the housing and extends parallel to the first side (S1) of the housing. At this time, the first part (110) does not extend to the corner formed by the first side (S1) and the second side (S2) of the housing. That is, the total length of the first part (110) may be shorter than half the length of the first side (S1) of the housing (300).

[0044] The second part (120) is bent from the end portion (110e) of the first part toward the second side (S2) of the housing at a predetermined angle (θ) with the first side (S1) of the housing. That is, the angle formed by the second part (120) and the first part (110) may be an obtuse angle.

[0045] The third portion (130) extends parallel to the second side (S2) of the housing (300) from the end portion (120e) of the second portion toward the third side (S3) of the housing (300). The end portion (120e) of the third portion is bent toward the second side (S2) of the housing.

[0046] The fourth portion (140) extends downwardly in the optical axis direction from the end portion (120e) of the third portion on the inside of the cover forming the second side (S2) of the housing (300). At this time, the length of the extended portion may be the same as the length of the end portion (120e) of the third portion bent toward the second side (S2) or may have a difference of 3% or less. Thereafter, the fourth portion (140) extends from the downwardly bent portion toward the first side (S1) of the housing along the second side (S2) of the housing. The length (L4) of the fourth portion (140) at the second side (S2) of the housing (300) is formed to be longer than the length (L3) of the third portion (130).

[0047] The fifth portion (150) is bent downward in the optical axis direction from the end portion (140e) of the fourth portion (140) and connected to the printed circuit board. The widths (W1 to W4) of the first to fourth portions (110 to 140) may have the same size or may differ by 3% or less.

[0048] The FPCB (100) may include a first line (L1) connected to ground; a second line (L2) transmitting the operating power of the aperture driving module (200); a first signal line (SDA) (L3) for data communication necessary for controlling the operation of the aperture driving module (200); and a second signal line (SCL) (L4) providing a timing synchronization clock for controlling the operation of the aperture driving module (200). At this time, the first line (L1) is provided with a first connection terminal (T1), the second line (L2) with a second connection terminal (T2), the first signal line (L3) with a third connection terminal (T3), and the second signal line (L4) with a fourth connection terminal (T4), and are each connected to the printed circuit board.

[0049] FIG. 7 is a perspective view showing a lens driving device according to another embodiment of the present invention, FIG. 8 is an exploded perspective view of a lens driving device according to another embodiment of the present invention, FIG. 9 is a plan view of a lens driving device according to another embodiment of the present invention, FIG. 10 is an exemplary view showing a plurality of upper elastic bodies applied to a lens driving device according to another embodiment of the present invention and an OIS wire for signal transmission, and FIG. 11 is an exemplary view showing a connection state of upper elastic bodies applied to a lens driving device according to another embodiment of the present invention.

[0050] A lens driving device according to another embodiment of the present invention includes a housing (300), a bobbin (220), a lens module (230), an aperture part (240), an OIS wire (500), an upper elastic member (400), and a signal transmission part (100A, 100B) based on the stacking order.

[0051] The lens driving device according to the embodiment can perform an 'auto focus function'. Here, the auto focus function refers to automatically focusing the image of a subject on the image sensor surface. In addition, the lens driving device according to the embodiment can perform an 'optical image stabilizer function'. Here, the optical image stabilizer (OIS) function refers to preventing the outline of a captured image from not being clearly formed due to vibration caused by the user's hand shaking when capturing a still image.

[0052] In order to compensate for image shaking due to factors such as the user's hand shaking, the lens module (230) can be moved in a first direction (X-axis) perpendicular to the optical axis (Z-axis) and a second direction (Y-axis) perpendicular to the optical axis and the first direction. That is, the hand shake correction function compensates for shaking by providing a relative displacement corresponding to the shaking to the lens module (230) when shaking occurs during image shooting due to the user's hand shaking, etc.

[0053] The interior of the housing (300) includes a printed circuit board equipped with an image sensor (not shown) and an integrated circuit storing an algorithm for controlling the auto focusing and optical image stabilization (OIS) function of the lens module (230) and the amount of incident light using the aperture (240).

[0054] . The housing (300) can accommodate a bobbin (220) on the inside and can move in a direction perpendicular to the optical axis (OA) by OIS driving. The housing (300) may have an overall hollow column shape. For example, the housing (400) may have a polygonal (e.g., square or octagonal) or circular opening, and the opening of the housing (300) may be in the form of a through hole penetrating the housing (300) in the direction of the optical axis.

[0055] The above bobbin (220) is placed within the housing (300) and can perform an auto-focus function by reciprocating in the optical axis direction through electromagnetic interaction between the coil and the driving magnet.

[0056] The bobbin (220) may have an opening for mounting a lens or lens barrel. The opening of the bobbin (220) may be a through hole penetrating the bobbin (220) in the direction of the optical axis, and the shape of the opening of the bobbin (220) may be circular, oval, or polygonal, but is not limited thereto.

[0057] A lens may be directly mounted into the opening of the bobbin (220), but is not limited thereto, and in other embodiments, a lens barrel for mounting or coupling at least one lens may be coupled or mounted into the opening of the bobbin (220). The lens or lens barrel may be coupled to the inner surface of the bobbin (220) in various ways.

[0058] A lens module (230) having a plurality of lenses stacked in the optical axis direction within a lens barrel is inserted into the space inside the bobbin (220).

[0059] The aperture (240) is positioned on the upper portion of the lens module (230) and controls the amount of light incident on the lens of the lens module (230) by varying the aperture according to an applied control signal.

[0060] The upper elastic member (400) is divided into a plurality of pieces and coupled to the bobbin (220) and the housing (300) to elastically support the movement of the bobbin (220) in a direction parallel to the optical axis. The upper elastic member (400) includes a first upper elastic member (400a), a second upper elastic member (400b), a third upper elastic member (400c), and a fourth upper elastic member (400d) that are divided from each other.

[0061] The signal transmission unit (100) includes a first signal transmission unit (100A) and a second signal transmission unit (100B) that are arranged symmetrically with respect to the lens module (230) and the aperture unit (240). The first and second signal transmission units (100A, 100B) can be connected to the aperture unit (240) and each upper elastic member (400a to 400d) by soldering, respectively.

[0062] The first signal transmission unit (100A) has one end connected to the first upper elastic member (400a) and the fourth upper elastic member (400d) adjacent to the fourth side (S4) of the housing (300), and the other end connected to the aperture unit (240) to transmit a signal required for the operation of the aperture unit (240) to the aperture unit (240).

[0063] The second signal transmission unit (100B) has one end connected to the second upper elastic member (400b) and the third upper elastic member (400c) adjacent to the second side (S2) at a position symmetrical to the fourth side (S4) of the housing (300), and the other end connected to the aperture unit (240) to transmit a signal required for the operation of the aperture unit (240) to the aperture unit (240).

[0064] The first signal transmission unit (100A) is connected to the first and fourth upper elastic members (400a, 400d) to supply power required for aperture driving, and the second signal transmission unit (100B0) is connected to the second and third upper elastic members (400b, 400c) to supply control signals (SDA, SCL) required for aperture driving.

[0065] In another embodiment, the first signal transmission unit (100A) may be connected to the first and fourth upper elastic members (400a, 400d) to supply control signals (SDA, SCL) necessary for aperture driving, and the second signal transmission unit (100B) may be connected to the second and third upper elastic members (400b, 400c) to supply power necessary for aperture driving.

[0066] As another embodiment, the first signal transmission unit (100A) may receive a data signal (SDA) required for aperture driving from the first elastic member (400a), receive power required for aperture driving from the fourth upper elastic member (400d), and the second signal transmission unit (100B) may receive a timing clock signal (SCL) required for aperture driving through the second upper elastic member (400b), receive power required for aperture driving from the third upper elastic member (400c), and transmit the signal to the aperture unit (240). The roles of the first signal transmission unit (100A) and the second signal transmission unit (100B) may be reversed.

[0067] As another embodiment, the first signal transmission unit (100A) may receive a timing clock signal (SCL) required for aperture driving from the first elastic member (400a), receive power required for aperture driving from the fourth upper elastic member (400d), and the second signal transmission unit (100B) may receive a data signal (SDA) required for aperture driving through the second upper elastic member (400b), receive power required for aperture driving from the third upper elastic member (400c), and transmit the data signal to the aperture unit (240). The roles of the first signal transmission unit (100A) and the second signal transmission unit (100B) may be reversed.

[0068] A plurality of OIS wires (500a to 500d) are each connected to the first upper elastic member (400a to 400d) so as to receive power and control signals (SDA, SCL) required for aperture operation from the printed circuit board and transmit them to the aperture unit (240) through the first upper elastic member (400a to 400d).

[0069] For example, a part (101B) of the second signal connecting portion (100B) may receive an operating power or an aperture control signal required for the aperture operation from the second upper elastic member (400b) connected to the second connecting terminal (T2) of the second line (L2), and another part (102B) of the second signal connecting portion (100B) may receive an operating power or an aperture control signal required for the aperture operation from the third upper elastic member (400c) connected to the first connecting terminal (T1) of the first line (L1).

[0070] As described above, the lens driving device according to the present invention has a structure in which one end of an FPCB arranged adjacent to two sides of a housing adjacent to each other is connected to an aperture driving unit and the other end is connected to a printed circuit board, or one end is connected to the aperture driving unit and the other end is connected to an upper elastic member, and power and operating signals required for aperture driving are transmitted to the aperture driving unit through an OIS wire, thereby enabling the aperture to be operated stably.

[0071] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0072] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0073] The embodiment can be used in a lens driving device and a camera device capable of stably interfacing a driving power source and a control signal to an aperture driving module.

Claims

1. A housing comprising a first side and a second side adjacent to the first side; A printed circuit board arranged on the second side of the housing; FPCB connected to the above printed circuit board; and Including an aperture driving module connected to the above FPCB, The above FPCB connecting line; A first terminal arranged at one end; and including a second terminal arranged at the other end, The first terminal is connected to the aperture driving module through the connecting line at a position corresponding to the first side, The second terminal is connected to the printed circuit board at a position corresponding to the second side, Lens drive mechanism.

2. In the first paragraph, the FPCB, A first part (110) that is bent from a connecting portion (110s) connected to the above connecting line (CL) and extends parallel to the first side (S1) of the housing; A second part (120) that is bent and extends from the end portion (110e) of the first part toward the second side (S2) of the housing at a predetermined angle (θ) with the first side (S1) of the housing; A third part (130) extending parallel to the second side (S2) of the housing from the end portion (120e) of the second part; A fourth part (140) that is bent in the direction of the second side (S2) of the housing from the end portion (120e) of the third part and then bent downward in the direction of the optical axis and extends along the second side (S2) of the housing toward the first side (S1) of the housing; and A lens driving device including a fifth part (150) that is bent downward in the optical axis direction at the end portion (140e) of the fourth part and connected to the printed circuit board.

3. In the second paragraph, the lens driving device wherein the second part forms an obtuse angle with the first part and extends in the second side direction of the housing.

4. In the second paragraph, the lens driving device in which the first to fourth parts have the same width.

5. A lens driving device in the fourth paragraph, wherein the length of the fourth part is formed to be longer than the length of the third part.

6. In the second paragraph, the FPCB, First line connected to the ground; A second line for transmitting operating power to the above aperture driving module; A first signal line (SDA) for data communication required to control the operation of the above aperture driving module; and A lens driving device including a second signal line (SCL) that provides a timing synchronization clock for controlling the operation of the aperture driving module.

7. Housing; A printed circuit board arranged inside the housing; A bobbin arranged within the housing and reciprocating in the direction of the optical axis; A lens module mounted on the above bobbin; An aperture unit positioned on the upper portion of the lens module and having a variable diameter according to the applied power and control signals; An upper elastic member connecting the bobbin and the housing; A signal transmission unit that connects the aperture unit and the upper elastic member and transmits the power and control signals to the aperture unit; A lens driving device including an OIS wire that connects the printed circuit board and the upper elastic member to transmit the power and control signals to the upper elastic member.

8. In the 7th paragraph, a lens driving device in which the signal transmission unit is connected to the aperture unit by soldering.

9. In paragraph 7, The upper elastic member includes first to fourth upper elastic members that are separated from each other and arranged spaced apart from each other, The above signal transmission unit A first signal transmission unit connected to the aperture portion and each of the first upper elastic member and the second upper elastic member in an area adjacent to the first side of the housing and transmitting a first signal to the aperture portion; A second signal transmission unit connected to the aperture portion and the third upper elastic member and the fourth upper elastic member in an area adjacent to the third side opposite the first side of the housing and transmitting a second signal to the aperture portion.

10. In the 9th paragraph, the lens driving device in which the plurality of OIS wires are respectively connected to the first to fourth upper elastic members at each corner of the housing.

Images