KR102746517B1 - Lens driving unit, camera module and optical apparatus - Google Patents

Abstract

The present invention relates to a lens driving unit including: a bobbin accommodating a lens module inside; a first driving unit located in the bobbin; a first housing located outside the bobbin; a second driving unit located in the first housing and moving the first driving unit through interaction with the first driving unit; a third driving unit moving the second driving unit through interaction with the second driving unit; a second housing located outside the first housing; a first support member elastically connecting the bobbin and the first housing; and a second support member elastically connecting the first housing and the second housing.
Through the present invention, image distortion occurring at the periphery of a shake-corrected image can be minimized.

Description

{Lens driving unit, camera module and optical apparatus}

The present embodiment relates to a lens driving unit, a camera module, and an optical device.

As various types of mobile terminals become more widespread and wireless Internet services become commercialized, consumer demands related to mobile terminals are also diversifying, and various types of additional devices are being installed in mobile terminals.

A representative example among them is a camera module that captures a subject as a photo or video.

Meanwhile, camera modules equipped with auto focus (AF) and optical image stabilization (OIS) functions have been used recently. Meanwhile, conventional camera modules perform the image stabilization function by shifting the lens left and right. However, in camera modules that perform the image stabilization function by shifting, the image is distorted at the edges of the corrected image, which is a problem.

(Patent Document 1) WO 2009-139543 A1

In order to solve the above-described problem, it is an object to provide a lens drive unit that performs a shake correction function by moving the lens in a tilt manner.

In addition, it is intended to provide a camera module and an optical device including the lens driving unit.

A lens driving unit according to the present embodiment may include: a bobbin accommodating a lens module inside; a first driving unit positioned in the bobbin; a first housing positioned outside the bobbin; a second driving unit positioned in the first housing and moving the first driving unit through interaction with the first driving unit; a third driving unit moving the second driving unit through interaction with the second driving unit; a second housing positioned outside the first housing; a first support member elastically connecting the bobbin and the first housing; and a second support member elastically connecting the first housing and the second housing.

The second support member may include an upper second support member coupled with the upper portion of the first housing and the upper portion of the second housing, and a lower second support member coupled with the lower portion of the first housing and the lower portion of the second housing.

The above third driving unit can be positioned spaced apart from the second driving unit downward.

The above second driving unit can be fixed to the first housing so that the entire lower surface of the second driving unit is exposed to the third driving unit.

The above second driving unit is fixed to the inside of the first housing and at least a portion thereof may protrude downwards from the first housing.

It further includes a base located on the lower side of the second housing, and the third driving unit is equipped with an FP coil and can be located on the upper surface of the base in a state of being mounted on a circuit board.

The second housing further includes a cover member having an inner space of a lower open type and a lower end joined to the base, and the second housing can be located on the inner surface of the cover member.

The above first driving part is positioned in a first driving part mounting groove formed by the outer surface of the bobbin being sunken inward, and the outer surface of the first driving part and the outer surface of the bobbin can form a flat surface.

The above bobbin can be supported so as to be movable in the optical axis direction of the lens module with respect to the first housing.

The above first housing can be supported so as to be tiltable with respect to the second housing.

The second driving unit includes a first magnet and a second magnet spaced apart from the first magnet, the third driving unit includes a first coil opposing the first magnet and a second coil opposing the second magnet, and the directions of current applied to the first coil and the second coil can be controlled separately.

The first support member may include an upper first support member coupled with the upper portion of the bobbin and the upper portion of the first housing, and a lower first support member coupled with the lower portion of the bobbin and the lower portion of the first housing.

The first driving unit and the third driving unit may include a coil, and the second driving unit may include a magnet.

A camera module according to the present embodiment may include: a bobbin accommodating a lens module on the inside; a first driving unit positioned in the bobbin; a first housing positioned on the outside of the bobbin; a second driving unit positioned in the first housing and moving the first driving unit through interaction with the first driving unit; a third driving unit moving the second driving unit through interaction with the second driving unit; a second housing positioned on the outside of the first housing; a first support member elastically connecting the bobbin and the first housing; and a second support member elastically connecting the first housing and the second housing.

An optical device according to the present embodiment includes a main body, a display portion arranged on one surface of the main body to display information, and a camera module installed in the main body to capture images or photographs, wherein the camera module may include a bobbin accommodating a lens module inside thereof; a first driving portion positioned in the bobbin; a first housing positioned on the outside of the bobbin; a second driving portion positioned in the first housing and moving the first driving portion through interaction with the first driving portion; a third driving portion moving the second driving portion through interaction with the second driving portion; a second housing positioned on the outside of the first housing; a first support member elastically connecting the bobbin and the first housing; and a second support member elastically connecting the first housing and the second housing.

Through the present invention, image distortion occurring at the periphery of a shake-corrected image can be minimized.

Fig. 1 is a cross-sectional view of a lens driving unit according to the present embodiment.
FIG. 2 is a cross-sectional view illustrating the operation of a lens driving unit according to the present embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. When adding reference numerals to components in each drawing, it should be noted that the same components are given the same numerals as much as possible even if they are shown in different drawings. In addition, when describing embodiments of the present invention, if it is determined that a specific description of a related known configuration or function hinders understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

Also, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

Below, the configuration of an optical device according to one embodiment of the present invention is described.

An optical device according to one embodiment of the present invention may be, but is not limited to, a mobile phone, a cell phone, a smart phone, a portable smart device, a digital camera, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, etc., and any device for taking images or pictures may be used.

An optical device according to one embodiment of the present invention may include a main body (not shown), a display unit (not shown) arranged on one side of the main body to display information, and a camera (not shown) installed in the main body to take images or photographs and having a camera module (not shown).

Below, the configuration of the camera module is described.

The camera module may include a lens driving unit (not shown), a lens module (10), an infrared blocking filter (not shown), a printed circuit board (not shown), an image sensor (not shown), and a control unit (not shown).

The lens module (10) may include one or more lenses (not shown) and a lens barrel that accommodates the one or more lenses. However, the configuration of the lens module (10) is not limited to the lens barrel, and any holder structure capable of supporting one or more lenses may be used. The lens module (10) is coupled to the lens driving unit and may move together with the lens driving unit. The lens module (10) may be screw-coupled to the lens driving unit, for example. The lens module (10) may be adhered to the lens driving unit by ultraviolet-curing epoxy, for example. The lens module (10) may be coupled to the inside of the lens driving unit, for example. Meanwhile, light passing through the lens module (10) may be irradiated to an image sensor.

An infrared cut filter can block infrared light from entering an image sensor. The infrared cut filter can be positioned between a lens module (10) and an image sensor, for example. The infrared cut filter can be installed on a base (not shown) and combined with a holder member (not shown). As an example, the infrared filter can be mounted in a hollow hole (not shown) formed in the center of the base. The infrared filter can be formed of a film material or a glass material, for example. Meanwhile, the infrared filter can be formed by coating an infrared cut coating material on a flat optical filter, such as a cover glass for protecting an imaging surface, for example.

The printed circuit board can support the lens driving unit. An image sensor can be mounted on the printed circuit board. More specifically, the lens driving unit can be positioned on the upper part of the printed circuit board, and the image sensor can be positioned on the inner side of the upper surface of the printed circuit board. In addition, a sensor holder (not shown) can be coupled to the outer side of the upper surface of the printed circuit board, and the lens driving unit can be coupled on the sensor holder. Through the above structure, light passing through the lens module (10) accommodated on the inner side of the lens driving unit can be irradiated to the image sensor mounted on the printed circuit board. The printed circuit board can supply power to the lens driving unit. Meanwhile, a control unit for controlling the lens driving unit can be positioned on the printed circuit board.

The image sensor can be mounted on a printed circuit board. The image sensor can be positioned so that the optical axis of the image sensor is aligned with that of the lens module (10). Through this, the image sensor can obtain light passing through the lens module (10). The image sensor can output the irradiated light as an image. The image sensor can be, for example, a CCD (charge coupled device), a MOS (metal oxide semi-conductor), a CPD, and a CID. However, the type of the image sensor is not limited thereto.

The control unit may be mounted on a printed circuit board. In addition, the control unit may be located, for example, inside the lens driving unit. The control unit may control the direction, intensity, amplitude, etc. of the current supplied to each component forming the lens driving unit. The control unit may control the lens driving unit to perform at least one of the auto focus function and the shake correction function of the camera module. That is, the control unit may control the lens driving unit to move the lens module (10) in the optical axis direction, move it in a direction perpendicular to the optical axis direction, or tilt it. Furthermore, the control unit may perform feedback control of the auto focus function and the shake correction function.

Below, the configuration of the lens driving unit is described in detail with reference to the drawings.

Fig. 1 is a cross-sectional view of a lens driving unit according to the present embodiment.

Referring to FIG. 1, the lens driving unit according to the present embodiment may include a first actuator (200), a second actuator (300), a second housing (410), a third actuator (420), a first support member (600), and a second support member (700). However, in the lens driving unit according to the present embodiment, at least one of the first actuator (200), the second actuator (300), the second housing (410), the third actuator (420), the first support member (600), and the second support member (700) may be omitted. Meanwhile, the lens driving unit according to the present embodiment may further include a cover member (not shown), a base (not shown), an autofocus sensor (not shown), and an image stabilization sensor (not shown).

The cover member can form the appearance of the lens driving unit. The cover member can have a hexahedral shape with an open bottom. However, the present invention is not limited thereto. The cover member can include an upper surface and a side surface extending downward from the outer side of the upper surface. Meanwhile, the cover member can be mounted on the upper part of the base. In the internal space formed by the cover member and the base, a first actuator (200), a second actuator (300), a second housing (410), a third actuator (420), a first support member (600), and a second support member (700) can be positioned. In addition, the cover member can be mounted on the base with its inner surface in close contact with part or all of the side surface of the base. Through this structure, the cover member can protect internal components from external impact and at the same time have a function of preventing the penetration of external contaminants.

The cover member may be formed of, for example, a metal material. More specifically, the cover member may be provided with a metal plate. In this case, the cover member can block radio interference. That is, the cover member can block radio waves generated outside the lens driving unit from flowing into the inside of the cover member. In addition, the cover member can block radio waves generated inside the cover member from being emitted outside the cover member. However, the material of the cover member is not limited thereto.

The cover member may include an opening (not shown) formed on the upper surface to expose the lens module (10). The opening may be provided in a shape corresponding to the lens module (10). The size of the opening may be formed to be larger than the diameter of the lens module (10) so that the lens module (10) can be assembled through the opening. In addition, light introduced through the opening may pass through the lens module (10). Meanwhile, light passing through the lens module (10) may be transmitted to the image sensor.

The first actuator (200) may include a bobbin (210) and a first driving unit (220). The first actuator (200) may be coupled with a lens module (10), which is a component of a camera module (however, the lens module (10) may also be described as a component of a lens driving unit). That is, the lens module (10) may be located on the inner side of the first actuator (200). In other words, the outer surface of the lens module (10) may be coupled to the inner surface of the first actuator (200). Meanwhile, the first actuator (200) may move integrally with the lens module (10) through interaction with the second actuator (300). That is, the first actuator (200) may move the lens module (10).

The first actuator (200) may include a bobbin (210). In addition, the first actuator (200) may include a first driving unit (220) coupled with the bobbin (210).

The bobbin (210) can be coupled with the lens module (10). The bobbin (210) can accommodate the lens module (10) on the inside. More specifically, the inner surface of the bobbin (210) can be coupled with the outer surface of the lens module (10). Meanwhile, the first driving unit (220) can be coupled to the bobbin (210). In addition, the lower part of the bobbin (210) can be coupled with the lower first support member (620), and the upper part of the bobbin (210) can be coupled with the upper first support member (610). The bobbin (210) can be located on the inside of the first housing (310). The bobbin (210) can move in the optical axis direction with respect to the first housing (310).

The bobbin (210) may include a lens coupling portion (211) formed on the inside. A lens module (10) may be coupled to the lens coupling portion (211). A screw thread having a shape corresponding to the screw thread formed on the outer surface of the lens module (10) may be formed on the inner surface of the lens coupling portion (211). That is, the outer surface of the lens module (10) may be screw-coupled to the inner surface of the lens coupling portion (211). Meanwhile, the outer surface of the lens module (10) and the inner surface of the lens coupling portion (211) may be coupled by an adhesive. At this time, the adhesive may be an ultraviolet-curable epoxy.

The bobbin (210) may include a first driving unit mounting groove (not shown) in which the first driving unit (220) is wound or mounted. The first driving unit mounting groove may be formed integrally with the outer surface of the bobbin (210). In addition, the first driving unit mounting groove may be formed continuously along the outer surface of the bobbin (210) or formed spaced apart at a predetermined interval. The first driving unit mounting groove may be formed by a portion of the outer surface of the bobbin (210) being sunken. The first driving unit (220) may be positioned in the first driving unit mounting groove, and the first driving unit (220) positioned in the first driving unit mounting groove may be supported by the outer surface of the bobbin (210) forming the first driving unit mounting groove. The first driving part (220) may be positioned in the first driving part mounting groove formed by the outer surface of the bobbin (210) being sunken inward. At this time, the outer surface of the first driving part (220) and the outer surface of the bobbin (210) may form a flat surface.

The bobbin (210) may include an upper coupling portion (213) coupled with an upper first support member (610). The upper coupling portion (213) may be coupled with an inner portion (612) of the upper first support member (610). As an example, a protrusion (not shown) of the upper coupling portion (213) may be inserted into a groove or hole (not shown) of the inner portion (612) and coupled. Meanwhile, the upper first support member (610) may be provided with a protrusion and the bobbin (210) may be provided with a groove or hole so that the two may be coupled.

The bobbin (210) may include a lower coupling portion (214) coupled with a lower first support member (620). The lower coupling portion (214) formed at the lower portion of the bobbin (210) may be coupled with an inner portion (622) of the lower first support member (620). As an example, a protrusion (not shown) of the lower coupling portion (214) may be inserted into a groove or hole (not shown) of the inner portion (622) and coupled. Meanwhile, the lower first support member (620) may be provided with a protrusion and the bobbin (210) may be provided with a groove or hole so that the two may be coupled.

The first driving unit (220) may be positioned opposite the second driving unit (320) of the second actuator (300). The first driving unit (220) may move the bobbin (210) with respect to the first housing (310) through electromagnetic interaction with the second driving unit (320). The first driving unit (220) may include a coil. The coil may be wound on the outer surface of the bobbin (210) while being guided by the first driving unit mounting groove (212). In addition, as another embodiment, the coil may be independently provided with four coils and arranged on the outer surface of the bobbin (210) such that two adjacent coils form a 90° angle with respect to each other. When the first driving unit (220) includes a coil, power supplied to the coil may be supplied through the lower first support member (620). At this time, the lower first support member (620) may be provided as a pair separately for supplying power to the coil. In addition, the power supplied to the coil may be supplied through the upper first support member (610). Meanwhile, the first driving unit (220) may include a pair of lead lines (not shown) for supplying power. Each of the pair of lead lines of the first driving unit (220) may be electrically coupled to each of the pair of lower first support members (620). Meanwhile, when power is supplied to the coil, an electromagnetic field may be formed around the coil. In addition, as another embodiment, the first driving unit (220) may include a magnet. In this case, the second driving unit (320) may be provided as a coil.

The second actuator (300) may be positioned on the outside of the first actuator (200) and facing the first actuator (200). The second actuator (300) may be movably supported in the second housing (410). The second actuator (300) may be positioned in the inner space of the cover member.

The second actuator (300) may include a first housing (310) positioned on the outside of the bobbin (210). In addition, the second actuator (300) may include a second actuator (320) positioned opposite the first actuator (220) and fixed to the first housing (310).

The first housing (310) is formed of an insulating material and may be formed as an injection molded product in consideration of productivity. The first housing (310) is a moving part for driving an optical image stabilization function (OIS) and may be positioned at a certain distance from the bobbin (210) and the second housing (410).

The first housing (310) can accommodate the first actuator (200) so that the upper and lower sides are open and the first actuator (200) can move up and down. The first housing (310) can include an inner space (not shown) that is open up and down on the inside. The first actuator (200) can be positioned in the inner space so as to be movable. That is, the inner space can be provided in a shape corresponding to the first actuator (200). In addition, the inner surface of the first housing (310) forming the inner space can be positioned apart from the outer surface of the first actuator (200).

The first housing (310) may include a second drive unit coupling part (312) formed on the side in a shape corresponding to the second drive unit (320) to accommodate the second drive unit (320). The second drive unit coupling part (312) may accommodate and fix the second drive unit (320). The second drive unit (320) may be fixed to the second drive unit coupling part (312) by an adhesive (not shown). Meanwhile, the second drive unit coupling part (312) may be located on the inner surface of the first housing (310). In this case, there is an advantage in electromagnetic interaction with the first drive unit (220) located on the inner side of the second drive unit (320). In addition, the second drive unit coupling part (312) may have an open bottom, for example. In this case, there is an advantage in the electromagnetic interaction between the third driving unit (420) located below the second driving unit (320) and the second driving unit (320). The second driving unit coupling unit (312) may be provided in four units, for example. The second driving unit (320) may be coupled to each of the four second driving unit coupling units (312).

An upper first support member (610) may be coupled to an upper portion of the first housing (310), and a lower first support member (620) may be coupled to a lower portion of the first housing (310). The first housing (310) may include an upper coupling portion (313) coupled with the upper first support member (610). The upper coupling portion (313) may be coupled with an outer portion (611) of the upper first support member (610). As an example, a protrusion (not shown) of the upper coupling portion (313) may be inserted into a groove or hole (not shown) of the outer portion (611) and coupled thereto. Meanwhile, in another embodiment, a protrusion may be provided on the upper first support member (610) and a groove or hole may be provided on the first housing (310) so that the two may be coupled. Meanwhile, the first housing (310) may include a lower coupling portion (not shown) coupled with the lower first support member (620). The lower coupling portion formed at the lower portion of the first housing (310) may be coupled with the outer portion (not shown) of the lower first support member (620). As an example, the protrusion of the lower coupling portion may be inserted into a groove or hole of the outer portion and coupled.

The first housing (310) can be accommodated inside the second housing (410). The first housing (310) can be elastically supported by the second support member (700) to the second housing (410). The first housing (310) can be supported so as to be able to tilt with respect to the second housing (410).

The second driving unit (320) may be positioned opposite the first driving unit (220) of the first actuator (200). The second driving unit (320) may move the first driving unit (220) through electromagnetic interaction with the first driving unit (220). The second driving unit (320) may include a magnet. The magnet may be fixed to the second driving unit coupling unit (312) of the first housing (310). As an example, the second driving unit (320) may be provided with four magnets independently and may be arranged in the first housing (310) such that two adjacent magnets form a 90° angle with respect to each other. That is, the second driving unit (320) can be mounted at equal intervals on the four sides of the first housing (310) to ensure efficient use of the internal volume. In addition, the second driving unit (320) can be bonded to the first housing (310) by an adhesive. However, it is not limited thereto. Meanwhile, the first driving unit (220) may include a magnet and the second driving unit (320) may be provided as a coil. The second driving unit (320) may include four magnets as an example. Each of the four magnets may be located on each of the four sides of the first housing (310). In addition, each of the four magnets may be located on each of the four corners of the first housing (310).

The second driving unit (320) may be fixed to the first housing (310) so that the entire lower surface of the second driving unit (320) is exposed to the third driving unit (420). In this case, the electromagnetic interaction between the second driving unit (320) and the third driving unit (420) may be advantageous compared to a case where a part of the lower surface of the second driving unit (320) is covered by the first housing (310). The second driving unit (320) may be fixed to the inner side of the first housing (310) and at least a part of the second driving unit (320) may protrude downward from the first housing (310). In this case, the entire lower surface of the second driving unit (320) may be exposed to the third driving unit (420).

The second housing (410) may be located on the outside of the first housing (310). The second housing (410) may accommodate the first housing (310) on the inside. The second housing (410) may movably support the first housing (310). The second housing (410) may be fixed to the inner surface of the cover member, for example. Meanwhile, the second housing (410) may be supported by the base, for example. The second housing (410) may be connected to the first housing (310) through the second support member (700). The second housing (410) may be elastically coupled to the first housing (310) through the second support member (700).

The third driving unit (420) may include a coil. When power is applied to the coil of the third driving unit (420), the second driving unit (320) and the first housing (310) to which the second driving unit (320) is fixed may move as a unit by interaction with the second driving unit (320). The third driving unit (420) may be mounted on a circuit board or electrically connected thereto. Meanwhile, the third driving unit (420) may have a through hole through which light of the lens module (10) passes. In addition, considering miniaturization of the lens driving unit (reducing the height in the z-axis direction, which is the optical axis direction), the third driving unit (420) may be formed as an FP coil, which is a patterned coil, and may be placed or mounted on the circuit board. At this time, the circuit board may include a flexible printed circuit board (FPCB), which is a flexible circuit board. The circuit board may be located between the third driving unit (420) and the base. Meanwhile, the circuit board may supply power to the third driving unit (420). The circuit board may have a through hole for passing light passing through the lens module (10). In addition, the circuit board may include a terminal portion that is folded and exposed to the outside. The terminal portion may be connected to an external power source, through which power may be supplied to the circuit board.

The third driving unit (420) may be positioned spaced apart from the second driving unit (320) downwardly. That is, the third driving unit (420) may be positioned spaced apart from the second housing (410). If the third driving unit (420) is positioned in the second housing (410), a number of configurations are required to supply power to the third driving unit (420), but if the third driving unit (420) is positioned below the second driving unit (320), the third driving unit (420) may be directly mounted on a circuit board or the like to receive power. The third driving unit (420) may be positioned on the base. However, a circuit board may be positioned between the third driving unit (420) and the base. The third driving unit (420) can be positioned on the upper surface of the base while being equipped with an FP coil and mounted on a circuit board.

The third driving unit (420) may include a first coil (421) facing the first magnet (321) of the second driving unit (320) and a second coil (422) facing the second magnet (322) of the second driving unit (320). At this time, the direction of the current applied to the first coil (421) and the second coil (422) may be controlled separately. That is, the direction of the current applied to the first coil (421) and the second coil (422) may correspond or be opposite. Through such current direction control, the second driving unit (420) may be tilted with respect to the third driving unit (420) (see B of FIG. 2).

The base may be positioned at the bottom of the bobbin (210), the first housing (310), and the second housing (410). As an example, the base may support the second housing (410) from the bottom. A printed circuit board may be positioned at the bottom of the base. The base may include a through hole formed at a position corresponding to a lens coupling portion (211) of the bobbin (210). The base may perform a sensor holder function for protecting the image sensor. Meanwhile, an infrared filter may be positioned at the base. In addition, an infrared filter may be coupled to the through hole of the base.

The base may include, for example, a foreign matter capturing portion (not shown) that captures foreign matter that has entered the inside of the cover member. The foreign matter capturing portion is located on the upper surface of the base and can capture foreign matter in the inner space formed by the cover member and the base, including an adhesive material.

The base may include a sensor mounting portion to which a shake correction sensor is coupled. That is, the shake correction sensor may be mounted on the sensor mounting portion. At this time, the shake correction sensor may detect the movement of the first housing (310) by detecting the second driving portion (320) coupled to the first housing (310). As an example, two sensor mounting portions may be provided. A shake correction sensor may be positioned on each of the two sensor mounting portions. In this case, the shake correction sensor may be arranged to detect both the x-axis and y-axis movements of the first housing (310).

The first support member (600) can connect the first movable member (200) and the second movable member (300). The first support member (600) can elastically connect the first movable member (200) and the second movable member (300) to enable relative movement between the first movable member (200) and the second movable member (300). That is, the first support member (600) can be provided as an elastic member. The first support member (600) can include, for example, an upper first support member (610) and a lower first support member (620).

The upper first support member (610) may include, for example, an outer portion (611), an inner portion (612), and a connecting portion (613). The upper first support member (610) may include an outer portion (611) coupled with the first housing (310), an inner portion (612) coupled with the bobbin (210), and a connecting portion (613) that elastically connects the outer portion (611) and the inner portion (612).

The upper first support member (610) can be connected to the upper portion of the first mover (200) and the upper portion of the second mover (300). In more detail, the upper first support member (610) can be coupled to the upper portion of the bobbin (210) and the upper portion of the first housing (310). The inner portion (612) of the upper first support member (610) can be coupled to the upper coupling portion (213) of the bobbin (210), and the outer portion (611) of the upper first support member (610) can be coupled to the upper coupling portion (313) of the first housing (310).

The upper first support member (610) may be provided as an example by being divided into six pieces. At this time, two of the six upper first support members (610) may be used to supply power to the first driving unit (220) by being electrically connected to the lower first support member (620). Meanwhile, the remaining four of the six upper first support members (610) may be used to supply power to the auto focus sensor located in the bobbin (210) and to transmit and receive information or signals between the control unit and the auto focus sensor. In addition, as a modification, two of the six upper first support members (610) may be directly connected to the first driving unit (220), and four may be connected to the auto focus sensor.

The lower first support member (620) may include, for example, a pair of lower first support members. Each of the pair of lower first support members (620) may be connected to a pair of lead lines of the first driving unit (220) provided with a coil to supply power. Meanwhile, the pair of lower first support members (620) may be electrically connected to a circuit board. Through this structure, the pair of lower first support members (620) may provide power supplied from the circuit board to the first driving unit (220).

The lower first support member (620) may include, for example, an outer portion (not shown), an inner portion (622), and a connecting portion (623). The lower first support member (620) may include an outer portion coupled with the first housing (310), an inner portion (622) coupled with the bobbin (210), and a connecting portion (623) that elastically connects the outer portion and the inner portion (622).

The lower first support member (620) can be connected to the lower portion of the first mover (200) and the lower portion of the second mover (300). More specifically, the lower first support member (620) can be connected to the lower portion of the bobbin (210) and the lower portion of the first housing (310). The lower coupling portion (214) of the bobbin (210) can be connected to the inner portion (622) of the lower first support member (620), and the lower coupling portion of the first housing (310) can be connected to the outer portion of the lower first support member (620).

The second support member (700) can elastically connect the first housing (310) and the second housing (410). The second support member (700) can be located on the outside of the first support member (600). That is, the second support member (700) can accommodate the first support member (600) on the inside. At least a portion of the second support member (700) can be provided as an elastic member. Through this, the second support member (700) can movably support the first housing (310) with respect to the second housing (410).

The second support member (700) may include an upper second support member (710) and a lower second support member (720).

The upper second support member (710) may include, for example, an outer portion (711), an inner portion (712), and a connecting portion (713). The upper second support member (710) may include an outer portion (711) coupled with the second housing (410), an inner portion (712) coupled with the first housing (310), and a connecting portion (713) that elastically connects the outer portion (711) and the inner portion (712).

The upper second support member (710) can be connected to the upper portion of the first housing (310) and the upper portion of the second housing (410). The inner portion (712) of the upper second support member (710) can be connected to the upper coupling portion (not shown) of the first housing (310), and the outer portion (711) of the upper second support member (710) can be connected to the upper coupling portion (not shown) of the second housing (410).

The upper second support member (710) may be used, for example, to supply power to one or more of the first driving unit (220), the second driving unit (320), and the third driving unit (420). In this case, the upper second support member (710) may be formed in multiple separate pieces.

The lower second support member (720) may include, for example, an outer portion (721), an inner portion (722), and a connecting portion (723). The lower second support member (720) may include an outer portion (721) coupled with the second housing (410), an inner portion (722) coupled with the first housing (310), and a connecting portion (723) that elastically connects the outer portion (721) and the inner portion (722).

The lower second support member (720) can be coupled to the lower portion of the first housing (310) and the lower portion of the second housing (410). The lower coupling portion (not shown) of the first housing (310) can be coupled to the inner portion (722) of the lower second support member (720), and the lower coupling portion (not shown) of the second housing (410) can be coupled to the outer portion (721) of the lower second support member (720).

The lower second support member (720) may be used, for example, to supply power to one or more of the first driving unit (220), the second driving unit (320), and the third driving unit (420). In this case, the lower second support member (720) may be formed in multiple separate pieces.

The auto focus sensor can be used for an auto focus (AF) feedback function. The auto focus sensor can detect the position or movement of at least one of the first actuator (200) and the second actuator (300). As an example, the auto focus sensor can be located in the first housing (310) and detect the position or movement of the first driving unit (220) to provide information for AF feedback. As another example, the auto focus sensor can be located in the bobbin (210) and detect the position or movement of the second driving unit (320) to provide information for AF feedback. The auto focus sensor can be mounted and positioned on an FPCB (Flexible Printend Circuit Board), and the FPCB can be electrically connected to the upper first support member (610). However, the position of the auto focus sensor is not limited thereto.

The image stabilization sensor can be used for an optical image stabilization (OIS) feedback function. The image stabilization sensor can detect the position or movement of at least one of the first actuator (200) and the second actuator (300). As an example, the image stabilization sensor can detect horizontal movement or tilt of the second actuator (300) to provide information for OIS feedback.

The shake correction sensor can be located on the base. The shake correction sensor can be located on the upper or lower surface of the circuit board on which the third actuator (420) is mounted. The shake correction sensor can be located, for example, on the lower surface of the circuit board and in a sensor mounting portion formed on the base. The shake correction sensor can include, for example, a Hall sensor. In this case, the relative movement of the second actuator (300) with respect to the third actuator (420) can be sensed by sensing the magnetic field of the second actuator (320) of the second actuator (300). The shake correction sensor can be provided in two or more units, for example, and can detect both the x-axis and y-axis movements of the second actuator (300).

Below, the operation of a camera module according to one embodiment of the present invention is described with reference to the drawings.

FIG. 2 is a cross-sectional view illustrating the operation of a lens driving unit according to the present embodiment.

First, the auto focus function of the camera module according to the present embodiment will be described. When power is supplied to the first driving unit (220) equipped with a coil, the first driving unit (220) moves with respect to the second driving unit (320) due to the electromagnetic interaction between the second driving unit (320) equipped with a magnet and the first driving unit (220). At this time, the bobbin (210) to which the first driving unit (220) is coupled moves integrally with the first driving unit (220). That is, the bobbin (210) with the lens module (10) coupled inside moves in the up-and-down direction or the optical axis direction (see A of FIG. 2) with respect to the first housing (310). This movement of the bobbin (210) results in the lens module (10) moving closer to or away from the image sensor, thereby performing focus adjustment for the subject.

Meanwhile, auto focus feedback may be applied to more precisely realize the auto focus function of the camera module according to the present embodiment. In more detail, the auto focus sensor is provided on the bobbin (210) so as to detect the magnetic field of the second driving unit (320). Meanwhile, when the bobbin (210) moves relative to the first housing (310), the amount of magnetic field detected by the auto focus sensor changes. The auto focus sensor detects the amount of movement or position of the bobbin (210) in the z-axis direction in this manner and transmits the detection value to the control unit. The control unit determines whether to perform additional movement of the bobbin (210) based on the received detection value. Since this process occurs in real time, the auto focus function of the camera module according to one embodiment of the present invention can be more precisely performed through the auto focus feedback.

The shake correction function of the camera module according to the present embodiment is described. When power is supplied to the third driving unit (420) equipped with a coil, the second driving unit (320) moves relative to the third driving unit (420) due to the electromagnetic interaction between the second driving unit (320) equipped with a magnet and the third driving unit (420). At this time, the first housing (310) to which the second driving unit (320) is coupled moves integrally with the second driving unit (320). That is, the first housing (310) moves relative to the third driving unit (420). At this time, since the current direction is provided differently to the first coil (421) of the third driving unit (420) and the second coil (422) located opposite the first coil (421), the first housing (310) can be tilted (see B of FIG. 2) with respect to the third driving unit (420). In this case, the bobbin (210) connected to the first housing (310) can also be tilted with respect to the third driving unit (420). Such movement of the bobbin (210) results in the lens module (10) being tilted with respect to the image sensor, and thus the shake correction function is performed.

Meanwhile, in order to more precisely realize the shake correction function of the camera module according to the present embodiment, shake correction feedback may be applied. A pair of shake correction sensors mounted on the base and equipped with a Hall sensor detect the magnetic field of the magnet of the second driving unit (320) fixed to the first housing (310). Meanwhile, when the second driving unit (320) performs a relative movement with respect to the third driving unit (420), the amount of the magnetic field detected by the shake correction sensor changes. The pair of shake correction sensors detect the horizontal movement amount (x-axis and y-axis directions) or position of the second driving unit (320) in this manner and transmit the detection value to the control unit. The control unit determines whether to perform additional movement of the second driving unit (320) based on the received detection value. Since this process occurs in real time, the shake correction function of the camera module according to one embodiment of the present invention can be performed more precisely through shake correction feedback.

In the above, even though all the components constituting the embodiments of the present invention have been described as being combined or operated in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the purpose of the present invention, all of the components may be selectively combined and operated one or more times. In addition, the terms "include," "compose," or "have" described above, unless specifically stated to the contrary, mean that the corresponding component may be present, and therefore should be interpreted as including other components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the relevant technology, and shall not be interpreted in an ideal or excessively formal meaning, unless explicitly defined in the present invention.

The above description is merely an illustrative description of the technical idea of the present invention, and those skilled in the art will appreciate that various modifications and variations may be made without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

210: Bobbin 220: 1st drive unit
310: 1st housing 320: 2nd drive unit
410: 2nd housing 420: 3rd drive unit
600: 1st support member 700: 2nd support member

Claims (20)

Second Housing;
A first housing disposed within the second housing;
A bobbin placed within the first housing;
A first driving unit arranged on the above bobbin;
A second driving unit arranged in the first housing;
A third driving unit that moves the second driving unit by interacting with the second driving unit;
A sensor for autofocus arranged in the first housing and detecting the position or movement of the first driving unit;
FPCB on which the above auto focus sensor is mounted;
A first support member elastically connecting the above bobbin and the first housing; and
Including a second support member that elastically connects the first housing and the second housing,
The above first housing is supported so as to be tiltable relative to the above second housing,
The above bobbin moves in the optical axis direction with respect to the first housing to perform autofocus,
The above auto focus sensor is used for feedback control of the auto focus,
The above first support member is arranged on the inner side of the above second support member,
At least a portion of the outer surface of the first support member and at least a portion of the inner surface of the second support member overlap in a direction perpendicular to the optical axis,
The first support member includes an upper first support member coupled with the upper portion of the bobbin and the upper portion of the first housing, and a lower first support member coupled with the lower portion of the bobbin and the lower portion of the first housing.
The above FPCB is a lens driving unit that is electrically connected to the upper first support member. In the first paragraph,
The above second driving unit is a lens driving unit that tilts with respect to the above third driving unit. In the first paragraph,
Includes a sensor for image stabilization,
The above-mentioned shake correction sensor is a lens driving unit that detects the tilt of the first housing. In the third paragraph,
base;
A cover member disposed on the above base; and
Including a circuit board on which the third driving unit is mounted,
The above second housing is placed on the base,
The above-mentioned shake correction sensor is a lens driving unit arranged on the lower surface of the circuit board. In paragraph 4,
The base is a lens driving unit including a foreign matter collecting section that is arranged on an upper surface of the base and includes an adhesive material to collect foreign matters in an inner space formed by the cover member and the base, and a sensor mounting section in which the shake correction sensor is arranged. delete delete In the first paragraph,
The second support member includes an upper second support member coupled with the upper portion of the first housing and the upper portion of the second housing, and a lower second support member coupled with the lower portion of the first housing and the lower portion of the second housing.
At least a portion of the upper first support member and at least a portion of the lower first support member overlap in the optical axis direction,
A lens driving unit in which at least a portion of the upper second support member and at least a portion of the lower second support member overlap in the optical axis direction. In Article 8,
A lens driving unit in which the upper first support member and the upper second support member are arranged on the same plane. In the first paragraph,
The above third driving unit is positioned below and spaced apart from the above second driving unit,
The above third driving unit is a lens driving unit arranged spaced apart from the second housing. In the first paragraph,
A lens driving unit in which the second driving unit is fixed to the first housing so that the entire lower surface of the second driving unit is exposed to the third driving unit. In the first paragraph,
A lens driving unit in which the second driving unit is fixed to the inside of the first housing and at least a portion thereof protrudes downward more than the first housing. In paragraph 4,
The third driving unit is a lens driving unit equipped with an FP coil and mounted on the circuit board and placed on the upper surface of the base. In Article 13,
The above cover member has an inner space with an open bottom and a lower portion is connected to the base,
The above second housing is a lens driving unit arranged on the inner surface of the cover member. In the first paragraph,
The above first driving part is placed in a first driving part mounting groove formed by the outer surface of the bobbin being sunken inward,
A lens driving unit in which the outer surface of the first driving unit and the outer surface of the bobbin form a flat surface. In the first paragraph,
Including an upper first support member that elastically connects the upper part of the above bobbin and the upper part of the above first housing,
The above FPCB is a lens driving unit that is electrically connected to the upper first support member. In the first paragraph,
The above first driving unit and the above third driving unit include a coil,
The above second driving unit includes a magnet,
The magnet of the second driving unit includes a first magnet and a second magnet spaced apart from the first magnet,
The coil of the third driving unit includes a first coil facing the first magnet and a second coil facing the second magnet,
A lens driving unit in which the direction of the current applied to the first coil and the second coil is separately controlled. Second Housing;
A second actuator disposed within the second housing and including a first housing and a second actuator;
A first actuator disposed within the second actuator and including a bobbin and a first driving unit;
A third driving unit that moves the second driving unit by interacting with the second driving unit;
A sensor for autofocus arranged in the first housing and detecting the position or movement of the first driving unit;
FPCB on which the above auto focus sensor is mounted;
Sensor for image stabilization;
A first support member elastically connecting the above bobbin and the first housing; and
Including a second support member that elastically connects the first housing and the second housing,
The above second driving unit is tilted with respect to the above third driving unit,
The above-mentioned shake correction sensor detects the tilt of the second actuator,
The above bobbin moves in the optical axis direction with respect to the first housing to perform autofocus,
The above auto focus sensor is used for feedback control of the auto focus,
The above first support member is arranged on the inner side of the above second support member,
At least a portion of the outer surface of the first support member and at least a portion of the inner surface of the second support member overlap in a direction perpendicular to the optical axis,
The first support member includes an upper first support member coupled with the upper portion of the bobbin and the upper portion of the first housing, and a lower first support member coupled with the lower portion of the bobbin and the lower portion of the first housing.
The above FPCB is a lens driving unit that is electrically connected to the upper first support member. printed circuit board;
An image sensor arranged on the above printed circuit board;
A lens driving unit according to any one of claims 1 to 5 and claims 8 to 18, arranged on the printed circuit board; and
A camera module including a lens coupled to the bobbin of the lens driving unit. entity;
A display unit arranged in the above body to display information; and
An optical device including a camera module according to claim 19, which is arranged in the main body and captures at least one of a video and a photograph.