KR102421546B1 - Fpcb with suspension structure and optical actuator using it - Google Patents

Abstract

The FPCB having the suspension structure of the present invention interfaces external power or electrical signals to the driving module in an actuator for a camera including a moving body provided with a driving module and a lens driven by applied power, and a housing for accommodating the moving body. A FPCB comprising: a first connection part exposed to the outside and installed in the housing; a second connection part electrically connected to a power terminal of the driving module; and a connection part connecting the first connection part and the second connection part, and having a suspension part having a shape bent in one or more curves or straight lines.

Description

FPCB having a suspension structure and an optical actuator using the same

The present invention relates to an FPCB applied to an optical actuator, and an optical actuator using the same, and more particularly, to an FPBC to which a suspension structure is applied to improve movement efficiency of a moving body including a lens.

As hardware technology for image processing develops and user needs for image shooting increase, autofocus (AF, Auto Focus), Functions such as optical image stabilization (OIS) are being implemented.

The autofocus function adjusts the focal length with the subject by linearly moving the lens or the lens-equipped assembly in the optical axis direction to create a clear image on the image sensor (CMOS, CCD, etc.) provided at the rear end of the lens. function means.

There are several ways to implement the autofocus function, and typical methods include installing a magnet (permanent magnet) on an AF carrier (or moving body), installing a coil on a fixed body (housing or other type of carrier, etc.) , a method of moving the moving body in the optical axis direction by generating electromagnetic force in the coil (provided in the fixed body) and the magnet (provided in the moving body) by the power applied to the coil in an appropriate size to the coil.

Digital Image Stabilization (DIS) (Electronic) is a technology to overcome image degradation caused by camera shake, etc. Image Stabilization (EIS) and Optical Image Stabilization (OIS) technology that physically corrects the position of the lens or image element caused by hand shake to prevent the image of the subject from being disturbed by the image sensor. have.

The optical image correction technique uses a method of compensating by moving the moving object in the direction (two directions perpendicular to the optical axis) to compensate for the movement caused by hand shake in the moving object equipped with the lens, and the force that moves the moving object is The electromagnetic force between the coil and the magnet is mainly used, and a method in which the movement is driven more precisely through position control by a Hall sensor is sometimes applied to AF or OIS.

The moving object on which the lens is mounted is provided with an iris (IRIS, APERTURE) that controls the amount of light entering, like a human iris, and this iris is usually driven by external power.

As such, in recent camera modules, the lens is not implemented in a fixed form on a specific member, but is mainly mounted on a moving body moving in the optical axis direction or in a direction perpendicular to the optical axis direction, and a driving unit driven by external power in the moving body are mounted

Therefore, the camera module or the actuator should include a configuration for applying external power to driving units mounted inside the continuously moving moving body, and a configuration for interfacing a control signal when a hall sensor or the like is provided on the moving body.

Conventionally, in order to apply power to the inside of a moving object, a method of connecting the outside (such as a circuit board of a fixed body) and the moving body with an electric line having a length in consideration of the moving distance of the moving body is used. It is easy to cause a disconnection by the camera, and the position is not determined, so there is a problem such as blocking the rear of the lens.

In addition, when a moving object is connected to the outside with a simple wiring, the precise movement of the moving object may be hindered by the load and tension of the wiring, and there is a problem in that tilting of the moving object is easy to occur.

Furthermore, conventionally, a method of allowing external power to be applied to a moving body using other components having conductivity provided inside the camera module is also used. Of course, it can cause significant inefficiencies in the assembly process and the like.

The present invention has been devised to solve the above-mentioned problems in the background as described above, and by using an FPCB having a structure in which the shape of the camera module can be adaptively changed as the moving body of the camera module moves, external power is supplied to the moving body. The purpose of the present invention is to realize an FPCB having a suspension structure that can ensure that the moving object moves precisely and can be effectively applied to the mobile phone as well as minimize the tilt failure of the moving object.

Other objects and advantages of the present invention may be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the configuration shown in the claims and the combination of the configuration.

An FPCB having a suspension structure of the present invention for achieving the above object is an external power source or electrical signal from an actuator for a camera including a moving body provided with a lens and a driving module driven by applied power, and a housing for accommodating the moving body. an FPCB for interfacing to the driving module, comprising: a first connection part exposed to the outside and installed in the housing; a second connection part electrically connected to a power terminal of the driving module; and a connection part connecting the first connection part and the second connection part, and having a suspension part having a shape bent in one or more curves or straight lines.

In addition, it is preferable that the suspension part of the present invention includes at least one shape extending from the first connection part to the second connection part and one or more shapes extending from the second connection part in the direction of the first connection part.

According to an embodiment, the suspension part of the present invention is connected to the first connection part, the first suspension part having a shape extending from the first connection part to the second connection part; and a second suspension part connected to the first suspension part and extending in the direction of the first connection part. In this case, the second connection part may be configured to be connected to the second suspension part.

For the implementation of a more preferred embodiment, the suspension part of the present invention is connected to the first connection part, the first suspension part having a shape extending from the first connection part to the second connection part; a second suspension part connected to the first suspension part and having a shape extending in the direction of the first connection part; and a third suspension part connected to the second suspension part and extending in the direction of the second connection part. In this case, the second connection part may be configured to be connected to the third suspension part.

In this case, the first suspension portion of the present invention extends from both sides of the first connection portion with respect to the central portion of the first connection portion, respectively, the second suspension portion is outward of the first suspension portion, and the third suspension portion is It is more preferable to configure the second suspension part to have a shape extending outward, and the second connection part of the present invention may be provided in a folded form at the end of the third suspension part.

In addition, the movable body of the present invention can be moved in the optical axis direction for automatic focus adjustment, and in this case, the second connection part of the present invention includes a portion in which the optical axis direction movement of the movable body is physically supported with respect to the center of the movable body. Preferably, it is configured to be electrically connected to the power terminal of the driving module at a position biased toward the direction.

According to a preferred embodiment of the present invention, even if the moving object of the camera module moves frequently, the overall position and shape can be maintained as expected, so that phenomena such as physical contact and collision with other components in the camera module are fundamentally prevented. can be prevented

In addition, according to the present invention, a suspension structure that adaptively accommodates the movement of a moving object even if it moves in the vertical direction is applied to minimize the physical resistance force according to the movement of the moving object, so that precise driving of the moving object can be maintained, as well as self-load It is possible to distribute the force pulling the moving object and to minimize the horizontal tilt failure of the moving object.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to more effectively understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so that the present invention is described in these drawings It should not be construed as being limited only to the matters.
1 is a view showing the overall configuration of an FPCB and a camera actuator including the same according to an embodiment of the present invention;
2 is a view showing an FPCB and another configuration according to a preferred embodiment of the present invention;
3 is a view showing the detailed configuration of the FPCB according to a preferred embodiment of the present invention;
4 is a view showing the state of the FPCB of the present invention in which the structure is adaptively accommodated according to the movement of the mobile body;
5 and 6 are views showing an FPCB according to another preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all the technical spirit of the present invention, so various equivalents that can replace them at the time of the present application It should be understood that there may be water and variations.

1 is a view showing the overall configuration of an FPCB 100 (hereinafter referred to as 'FPCB') having a suspension structure according to a preferred embodiment of the present invention and a camera actuator 1000 including the same.

As shown in FIG. 1 , the camera actuator 1000 of the present invention may include an FPCB 100 , a movable body 200 , a housing 300 , and a cover 500 .

The housing 300 corresponds to a kind of outer case that protects the internal configuration of the camera actuator 1000 together with the cover 500, and the movable body 200 moves in the optical axis direction (Z-axis direction) by autofocus (AF). It provides a space for movement or movement in a direction perpendicular to the optical axis (X-axis direction and Y-axis direction) for OIS, etc.

The movable body 200 is a configuration accommodated in the housing 300 and corresponds to an object that moves in the optical axis direction or in a direction perpendicular to the optical axis for automatic focus or hand shake correction. The movable body 200 is provided with a lens 210, and since the lens 210 and the physical movement are also made by the movement of the movable body 200, automatic focus adjustment or hand shake correction is performed.

In this aspect, the housing 300 corresponds to a fixed body in a relative relationship with the movable body 200 , and the movable body 200 corresponds to a moving object moving with respect to the housing 300 , which is the fixed body.

A driving module (not shown) driven by externally applied power is provided inside the moving body 200 . The driving module may be an iris driving unit that physically drives the plate in order to control the amount or time of light flowing into the lens, and includes a coil that generates electromagnetic force by the applied power to move the lens in a direction perpendicular to the optical axis. It may be an image stabilization driving unit that moves.

In addition, in the case of an embodiment in which AF is implemented in a form in which a permanent magnet is provided in a fixed body and a coil is provided in a moving object, the driving module may be an autofocus driving unit. As described above, the driving module provided in the movable body 200 of the present invention may be implemented in various forms as long as it is a unit driven by externally applied power.

Of course, the lens 210 of the present invention may be implemented in the form of a single lens, a form in which a plurality of lenses are assembled, or a type of lens group together with other optical devices, as well as a form of a barrel together with a case.

The FPCB 100 of the present invention corresponds to a configuration for interfacing an external power source or a driving control signal for controlling the driving module to the driving module, and other devices to which the camera actuator 1000 of the present invention is applied (for example, For efficient electrical connection with the main board of a smart phone, etc.), it is preferable that one end of the FPCB 100 is exposed to the outside as shown in FIG. 1 .

2 is a view showing the FPCB 100 and other configurations according to a preferred embodiment of the present invention. FIG. 2 is a bottom perspective view of the camera actuator 1000 of the present invention with the housing 300 removed from the drawing shown in FIG. 1 .

As shown in FIG. 2 , according to an embodiment of the present invention, the AF driving unit 400 may be provided in the housing 300 (a fixed body), and the moving body may be driven by the AF driving unit 400 driving processing. (200) moves up and down in the optical axis direction.

The AF driving unit 400 controls the position of the magnet provided in the moving object 200, that is, a hall sensor that senses the position of the moving object 200, and a signal output from the hall sensor so that power of an appropriate size and direction is applied. and a driving driver 410 . The Hall sensor and the driving driver may be implemented as separate components, or may be integrated into a single chip 410 as shown in FIG. 2 .

The AF driving unit 400 may include a coil 420 for generating electromagnetic force by externally applied power, and an AF circuit board 430 on which the coil 420 and the driving driver 410 are mounted, the AF circuit A magnet provided in the movable body 200 and a yoke 440 generating attractive force may be provided on the rear surface of the substrate 430 .

The movable body 200 moves up and down by the driving of the AF driving unit 400. In this case, since the iris driving or OIS driving must be performed by the driving module mounted on the movable body 200, the external power source moves the movable body ( 200), an interfacing configuration applied to it is required. The FPCB 100 of the present invention corresponds to a configuration that performs a function of applying external power to the moving body 200 as described above.

Hereinafter, the specific configuration of the FPCB 100 according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a detailed configuration of the FPCB 100 according to a preferred embodiment of the present invention. As shown in FIG. 3 , the FPCB 100 of the present invention is configured to include a first connection part 110 , a second connection part 120 , and a connection part 130 .

The first connection part 110 of the FPCB 100 is configured to function as a terminal exposed to the outside as described in FIG. 1 and the like. is installed

The second connection part 120 of the FPCB 100 is a part electrically connected to the movable body 200, and specifically, the driving module provided inside the movable body 200 through a through hole and a connection structure formed in the movable body 200. It corresponds to the part that is electrically connected to the power terminal.

The connection part 130 of the FPCB 100 is a part that connects the first connection part 110 and the second connection part 120, and as shown in FIG. 3, a suspension part having a shape bent by one or more curves or straight lines, etc. (131).

As shown in FIG. 3 , the suspension part 131 has one or more shapes extending from the first connection part 110 to the second connection part 120 direction and from the second connection part 120 to the first connection part 110 direction. One or more elongated shapes may be configured in combination. The extended shape may be a straight line most commonly, but may be implemented in various shapes, including a combination of a straight line and a curved shape, as shown in the drawings, depending on the embodiment.

Specifically, the suspension part 131 of the present invention may include a first suspension part 132 , a second suspension part 133 , and a third suspension part 134 .

The first suspension part 132 is connected to the first connection part 110 and has a shape extending from the first connection part 110 to the second connection part 120 direction, and the second suspension part 133 is the first It is connected to the suspension part 132 and has a shape extending in a direction opposite to the first suspension part 132 , that is, in the direction of the first connection part 120 .

Furthermore, the third suspension part 134 is connected to the second suspension part 133 and has a shape extending in the direction of the second connection part 120 by turning its extension direction again. In this case, the second connection part 120 of the present invention is connected to the third suspension part 134 .

According to the embodiment, the third suspension unit 134 may be omitted, and in this case, the moving body 200, that is, the second connecting unit 120 corresponding to a part electrically connected to the driving module provided in the moving body 200 is It may be connected to the second suspension unit 133 .

The second connection part 120 may be one of both ends of the connection part 130, as well as the shape of the movable body 200 and the movable body (200) in order to be electrically connected to the driving module inside the movable body (200). 200) Of course, it may have various structures and shapes depending on the shape and structure of the externally formed hole or terminal.

In the camera actuator 1000 of the present invention, a lens 210 is mounted in the center, and the light that passes through the lens 210 and enters the imaging device (CCD, CMOS, etc.) provided in the lower portion of the housing 300 is different due to a different configuration. It must not be covered or blocked.

Conventionally, a method of applying external power to the movable body 200 using a wire or the like has been used, so when the location of the wire moves to the rear of the lens due to frequent movement of the movable body 200, there is a problem such as blocking the light signal. could have occurred

The present invention is configured to more effectively solve this problem by adaptively deforming to the movement of the movable body 200 and not changing the provided position at the same time.

Specifically, as shown in FIG. 3 and the like, the first suspension part 132 of the present invention is configured to extend from both sides of the first connection part 110 with respect to the middle part of the first connection part 110, respectively, and the The second suspension part 133 extends outwardly of the first suspension part 132 to secure a space in the middle. Furthermore, when the third suspension part 134 is further included according to the embodiment, the third suspension part 134 is configured to have a shape extending outwardly of the second suspension part 133 .

In this configuration, it is possible to effectively secure a space in the center of the camera actuator 1000 , so that light entering the image pickup device from the lens 210 is not blocked or blocked at all.

More preferably, as shown in FIG. 3 , the first suspension part 132 , the second suspension part 133 , and the third suspension part 134 of the present invention may be configured to be symmetrical to each other. Through such a symmetrical structure, the load or tension of the entire FPCB 100 can be uniformly distributed, so that the influence on the precise driving of the movable body 200 can be further minimized, and the tilt failure of the movable body 200 can be more effectively prevented. can do.

FIG. 4 is a view showing the state of the FPCB 100 of the present invention in which the structure is adaptively accommodated according to the movement of the movable body 200 .

As shown in FIG. 4, the FPCB 100 of the present invention has a structure in which the shape of the movable body 200 is adaptively changed according to the vertical movement of the movable body 200 by the AF driving unit 400, so the load of the FPCB 100 is applied. Since the force transmitted to the movable body 200 can be minimized, the movable body 200 can be moved precisely, and furthermore, the possibility of occurrence of defects in horizontal tilt of the movable body 200 can be significantly reduced.

As shown in FIG. 4, the AF driving unit 400 is located on the right side with respect to the movable body 200, and generally between the movable body 200 and the AF driving unit 400, the flexible movement of the movable body 200 is guided and A ball or a moving guide rail for physically supporting the moving body 200 is provided.

In order to further minimize the effect of the force caused by the load or tension of the FPCB 100 on the movable body 200, the second connection part 120 of the FPCB 100 is located in the middle of the movable body 200 as shown in FIG. It is more preferable to be configured to be electrically connected to the power terminal of the driving module provided in the movable body 200 at a position (B of FIG. 4 ) deflected to the right with respect to the portion (A of FIG. 4 ).

That is, as described above, the AF driving unit 400 is provided on the right side with respect to the center of the moving body 200, and a ball or a moving guide rail positioned between the moving body 200 and the AF driving unit 400, etc. Since the movable body 200 is physically supported by the .

5 and 6 are views showing the FPCB 100 according to another preferred embodiment of the present invention.

FPCB 100 according to another preferred embodiment of the present invention is different from the above-described embodiment, that is, the second connecting portion 120 is connected to the end part of the connecting portion 130 (specifically, the third suspension portion 134). Unlike the form composed of It can be configured to extend in the direction of the first connection part 110 again in the form of "F" of 6).

In this configuration, as shown in FIG. 6 , the FPCB 100 of the present invention can be implemented in a layered structure, thereby realizing an adaptive change according to the movement of the movable body 200 as described above and simultaneously implementing the movable body 200 . ) can be further optimized for various shapes and structures.

In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto and will be described below with the technical idea of the present invention by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims.

In the above description of the present invention, modifiers such as first and second are only instrumental terms used to relatively distinguish between components, so they are used to indicate a specific order, priority, etc. It should not be construed as a term that

The accompanying drawings for the purpose of explaining the present invention and illustrating examples thereof may be shown in a somewhat exaggerated form in order to emphasize or highlight the technical contents of the present invention, but the above-described contents and matters shown in the drawings, etc. It should be construed as apparent that various types of modification application examples may be possible at the level of those skilled in the art in consideration of this.

1000: camera actuator
100: FPCB 110: first connection part
120: second connection part 130: connection part
131: suspension part 132: first suspension part
1333: second suspension unit 134: third suspension unit
200: movable body 210: lens
300: housing 400: AF driving part

Claims (8)

An FPCB for interfacing an external power source or an electrical signal to the driving module in an actuator for a camera including a moving body provided with a driving module driven by applied power and a lens, and a housing for accommodating the moving body, the FPCB comprising:
a first connection part exposed to the outside and installed in the housing;
a second connection part electrically connected to a power terminal of the driving module; and
It connects the first connection part and the second connection part, and includes a connection part having a suspension part having a shape bent in one or more curves or straight lines,
The suspension unit, FPCB having a suspension structure, characterized in that it includes at least one shape extending from the first connection portion in a direction to the second connection portion and at least one shape extending from the second connection portion in the direction of the first connection portion. delete According to claim 1, wherein the suspension unit,
a first suspension part connected to the first connection part and having a shape extending from the first connection part to a second connection part; and
and a second suspension part connected to the first suspension part and having a shape extending in the direction of the first connection part,
The second connection portion FPCB having a suspension structure, characterized in that connected to the second suspension portion. According to claim 1, wherein the suspension unit,
a first suspension part connected to the first connection part and having a shape extending from the first connection part to a second connection part;
a second suspension part connected to the first suspension part and having a shape extending in the direction of the first connection part; and
and a third suspension part connected to the second suspension part and having a shape extending in the direction of the second connection part,
The FPCB having a suspension structure, characterized in that the second connection portion is connected to the third suspension portion. 5. The method of claim 4, wherein the first suspension unit,
It extends from both sides of the first connection part based on the central part of the first connection part, respectively,
The FPCB having a suspension structure, characterized in that the second suspension portion has a shape extending outwardly of the first suspension portion, and the third suspension portion extends outwardly of the second suspension portion. According to claim 4, wherein the second connection portion,
FPCB having a suspension structure, characterized in that provided in a folded form at the end of the third suspension part. According to claim 1, wherein the movable body,
It moves in the direction of the optical axis for automatic focus adjustment.
The second connection part,
An FPCB having a suspension structure, characterized in that it is electrically connected to the power terminal of the driving module at a position deflected toward a portion where the optical axis movement of the movable body is physically supported with respect to the central portion of the movable body. An optical actuator comprising an FPCB having the suspension structure according to any one of claims 1 to 7.

Images