KR20190121950A - Camera module of individual control of lens - Google Patents

Abstract

Provided is a camera module for lens division control, which comprises: a housing; a first lens unit moving from the housing in the optical axis direction; a second lens unit moving from the housing along with the optical axis direction separated from the first lens unit; a first driving unit moving the first lens unit with respect to the housing; a second driving unit moving the second lens unit with respect to the housing; and a control unit controlling the first driving unit and the second driving unit. The control unit stores different charging section with respect to each of the first lens unit and the second lens unit among movable sections of the first lens unit and the second lens unit.

Description

Camera module for lens segmentation control {CAMERA MODULE OF INDIVIDUAL CONTROL OF LENS}

The present invention relates to a camera module for long stroke control of a lens, and more particularly, a camera having an improved structure to implement a camera module having a long stroke area to implement a small camera module including an optical zoom function. It is about a module.

Camera modules having an auto focusing function (AF) that automatically adjusts the lens focus when photographing a subject have been applied to mobile devices such as mobile phones and tablet PCs as well as general digital cameras.

It is very difficult to implement a zoom function in a small camera module. For example, a zoom function implemented in many camera modules is digital zoom, and a part of the captured image data is enlarged and displayed by a digital processing method to obtain a zoom effect. In other words, the zoom effect can be easily obtained in software without changing hardware such as a lens, but since only a limited portion of the entire screen is enlarged and displayed, the image quality may be degraded.

However, optical zoom implemented in a large camera or a professional camera is difficult to implement in a small camera module. This is because the lens must move along the optical axis in order to implement optical zoom, and it is difficult to secure a space for the lens to move, and even after the lens is moved to a desired section, the linearity of the hall sensor is not good in all sections. The disadvantage is that it is difficult to make fine adjustments to focus after the movement.

Japanese Patent Laid-Open No. 2009-086433 (published on April 23, 2009) discloses a compact zoom lens barrel unit. In the small zoom lens barrel unit, the optical axis direction coincides with the subject direction, that is, the photographing direction, and includes an enlarged lens group and a focus lens group, each lens group using a piezoelectric linear driver.

Chinese Patent Publication No. CN 101566714 (October 28, 2009 publication) discloses a camera module. The camera module includes two lens groups, including a first actuator and a second actuator moving the lens in the photographing direction.

Korean Patent Registration No. 10-1586244 (registered on Jan. 12, 2016) discloses a camera module having a zoom function. Looking at the camera module, it reflects the incident light using a reflector, and proposes a structure in which the autofocus lens and the zoom lens are separated.

The present invention provides a camera module for lens segmentation control that can accurately perform position control and focus adjustment even if the moving distance of the lens unit increases in millimeter units for a zoom function.

The present invention provides a camera module for lens segmentation control that can use a section having good linearity by dividing a sensing value of a hall sensor or the like and ensure stable linearity in the entire moving section of the lens.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, the camera module for lens segmentation control in the housing, the first lens unit moving in the optical axis direction in the housing, the housing separately from the first lens unit A second lens unit moving along the optical axis direction, a first driving unit moving the first lens unit relative to the housing, a second driving unit moving the second lens unit relative to the housing, and a control unit controlling the first driving unit and the second driving unit; The controller may store a different charge section (predetermined region or available region) for each of the first lens unit and the second lens unit among the movable sections of the first lens unit and the second lens unit.

According to the prior art, the maximum movement distance of the lens carrier in the actuator for autofocus control only is about 300 mu m, and in practice the movement distance by the combination of coil and magnet in auto focus control is about 160 mu m. Therefore, there is no problem about the linearity of the hall sensor because the actuator for autofocus control only needs to secure a moving distance of about 200 to 300 μm as in the related art.

However, in order to implement a zoom function in a small camera module, the moving distance of the lens unit may be increased in millimeter units, and in fact, it may be necessary to precisely move about 2 to 7.5 mm.

For reference, in the present specification, the lens unit may be formed of a single lens or two or more lens groups, and the driving unit is not limited to a coil and a magnet, but may be formed by various elements or methods such as piezoelectric elements and ultrasonic elements. It can be understood as a concept including a movable configuration.

Therefore, in the present exemplary embodiment, the controller may store different charge sections that can be easily controlled for each of the first lens unit and the second lens unit among the movable sections of the first lens unit and the second lens unit. Here, the concept of being different means that they are not the same, and any one may be connected to or separated from another by a specific boundary, may partially overlap, and does not exclude a case in which one is included in the other.

The controller may perform zoom movement according to the magnification for the optical zoom with respect to the first lens unit and the second lens unit, and perform focus control by using a lens unit that is easy to control among the first lens unit and the second lens unit. have. This may be distinguished from separate lenses for zoom movement and lenses for focus control in the prior art.

In detail, the controller may move at least one of the first lens unit and the second lens unit to move the zoom. However, the first lens unit and the second lens unit may be moved, at least one of which may be characterized in that the zoom movement to be located in the charge section defined above. Therefore, the case where both the first lens unit and the second lens unit are located outside the charge section may be actively excluded.

The focus control may be performed using the lens unit positioned in the charge section among the zoomed first and second lens units. Here, the lens unit positioned in the charge section may be either the first lens unit or the second lens unit, but in some cases, both the first lens unit and the second lens unit may be located in the charge section, and the control unit may include You can select one to use for focus control.

In the prior art, the movable section for autofocus control was only about 0.3 mm, but the movable section that is a problem in this embodiment is about 2 mm to 7.5 mm, when the movable section becomes 2 mm or more, Zoom movement and focus control may be technically advantageous.

The charge section is an easy-to-control section. According to the present exemplary embodiment, the linearity between the control distance of the lens unit in charge of the first and second lens units and the sensing value of the position sensor of the driver corresponding to the lens unit in charge is linear. It can be selected according to the linear movement interval to maintain.

According to the present embodiment, the camera module may further include a fixed lens unit positioned on the optical axis in the housing separately from the first lens unit and the second lens unit. The first lens unit and the second lens unit may be provided on the same side with respect to the fixed lens unit, and may be provided on only one side with respect to the fixed lens unit to move according to the zoom movement and the focus control, otherwise the first lens unit and The second lens unit may be provided at both sides with respect to the fixed lens unit.

In addition, a prism is provided at the entrance of the incident light in the housing, and the housing and the optical axis are oriented perpendicular to the line connecting the subject and the prism, that is, the photographing direction, to secure a sufficient moving distance of the lens unit.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, the camera module for lens segmentation control in the housing, the first lens unit moving in the optical axis direction in the housing, the housing separately from the first lens unit A second lens unit moving along the optical axis direction, a first driving unit moving the first lens unit relative to the housing, a second driving unit moving the second lens unit relative to the housing, and detecting a position of the first lens unit moving by the first driving unit It may include a first position sensor and a second position sensor for sensing the position of the second lens unit moved by the second drive unit, the first lens unit between the control distance and the sensing value of the first position sensor A second linear movement section for maintaining linearity, wherein the second lens unit maintains linearity between the control distance and the sensing value of the second position sensor; And a linear moving section, and the first linear moving section and the second linear moving section are not the same.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, the camera module for lens segmentation control in the housing, the first lens unit moving in the optical axis direction in the housing, the housing separately from the first lens unit A second lens unit moving along the optical axis direction, a first driving unit moving the first lens unit relative to the housing, a second driving unit moving the second lens unit relative to the housing, and detecting a position of the first lens unit moving by the first driving unit It may include a first position sensor and a second position sensor for sensing the position of the second lens unit moved by the second drive unit, the first lens unit between the control distance and the sensing value of the first position sensor A second linear movement section for maintaining linearity, wherein the second lens unit maintains linearity between the control distance and the sensing value of the second position sensor; The linear movement section may include a first linear movement section and a second linear movement section.

Here, the interconnection between the first linear movement section and the second linear movement section may mean that the boundary between the first linear movement section and the second linear movement section is in contact with or partially overlapped with each other. In the movable section of the lens unit, the linear moving section may be connected over most of the moving sections.

In the present specification, the first linear moving section or the second linear moving section may exist as separate sections instead of a single section, and the separated sections may be interconnected so that other linear moving sections complement each other.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, the camera module for lens segmentation control in the housing, the first lens unit moving in the optical axis direction in the housing, the housing separately from the first lens unit A second lens unit moving along the optical axis direction, a first driving unit moving the first lens unit relative to the housing, a second driving unit moving the second lens unit relative to the housing, and detecting a position of the first lens unit moving by the first driving unit A first position sensor, a second position sensor for detecting a position of the second lens unit moved by the second driver, and a zoom movement and focus of the first lens unit and the second lens unit using the first driver and the second driver. It may include a control unit for controlling the control, the control unit for zooming, zooming to move at least one of the first lens unit and the second lens unit for the optical zoom It may perform the first drive and a second drive section of the drive unit selection for selecting a driving unit for maintaining the linearity, and focus using the selected first or second drive unit drive control in accordance with the pupil position.

Here, a first linear movement section that maintains linearity between the control distance and the sensing value of the first position sensing sensor may be defined with respect to the first lens unit, and the control distance and the second position sensing sensor with respect to the second lens unit. A second linear moving interval may be defined to maintain linearity between sensing values of.

The controller may select the first lens unit for focus control when the first lens unit is in the first linear moving section after the zoom movement, and select the second lens unit for focus control when the second lens unit is in the second linear moving section. If both the first lens unit and the second lens unit are in the linear movement section, one of the two lenses may be selected to perform focus control.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, the camera module for lens segmentation control is a housing, a first facing the first inner surface of the housing and moving in the optical axis direction along the first inner surface 1. A first lens module including a first lens unit fixed to the lens fixing unit and the first lens fixing unit and positioned on the optical axis, and a second lens facing the second inner surface of the housing and moving along the second inner surface in the optical axis direction. A second lens module including a second lens unit fixed to the fixing unit and the second lens fixing unit and positioned on the optical axis; a first coil and a first coil provided on one side of the first inner surface of the housing and the first lens fixing unit; A first driving part including a first magnet provided on the other side corresponding to the coil to move the first lens part with respect to the housing, and a second coil provided on one side of the second inner surface and the second lens fixing part of the housing; And a second driving part for moving the second lens part, including a second magnet provided on the other side corresponding to the second coil. When defining a first neutral point where the center of the first coil and the first magnet coincide and a second neutral point where the center of the second coil and the second magnet coincides, the first neutral point is the optical axis with respect to the second neutral point. By spaced apart in the direction it is possible to ensure that the linear movement sections are not equal to each other or are interconnected.

In the prior art, the first drive and the second drive in accordance with the present embodiment are centered on the optical axis in contrast to the two drives arranged side by side with respect to the optical axis direction, one for zoom movement and the other for focus control. Can be distinguished in that they are arranged in parallel or on different sides and both are involved in zoom movement and focus control. The first inner surface and the second inner surface may face each other.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, a housing, a first lens portion moving in the optical axis direction in the housing, separate from the first lens portion along the optical axis direction in the housing A moving second lens unit, a first driving unit moving the first lens unit with respect to the housing, a second driving unit moving the second lens unit with respect to the housing, and a control unit controlling the first driving unit and the second driving unit The method of controlling lens division of a camera module including: storing, by the controller, different charge sections for the first lens unit and the second lens unit, and among the first lens unit and the second lens unit according to the magnification for photographing. Moving at least one, wherein at least one of the first lens unit and the second lens unit is zoomed to be positioned in the defined charge interval; and 2 with parts of the lens located in the charge zone by movement of the zoom lens unit can include a step of controlling the focus.

The controller may store another charge section for each of the first lens unit and the second lens unit among the movable sections of the first lens unit and the second lens unit, and the movable section may be 2 mm to 7.5 mm.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, a housing, a first lens portion moving in the optical axis direction in the housing, a second lens moving along the optical axis direction in the housing separately from the first lens portion The first drive unit for moving the first lens unit relative to the housing, the second drive unit for moving the second lens unit relative to the housing, the first position detection sensor for detecting the position of the first lens unit moved by the first drive unit, the second A second position sensor for sensing a position of the second lens unit moved by the driver, and a controller for controlling the first driver and the second driver by using signals from the first position sensor and the second position sensor; The method of controlling lens division of a camera module may include: a first control unit for maintaining a linearity between a control distance with respect to a first lens unit and a sensing value of a first position sensor; Storing a second linear movement section that maintains linearity between the control distance and the sensing value of the second position sensor with respect to the type movement section and the second lens unit, and at least one of the first lens unit and the second lens unit Moving, wherein at least one of the first lens unit and the second lens unit is zoomed to be positioned in a corresponding first linear movement section or second linear movement section, respectively, and zooming of the first lens unit and the second lens unit The method may include focusing control by using the lens unit positioned in the first linear movement section or the second linear movement section. Here, the first linear moving section and the second linear moving section are not the same.

According to an exemplary embodiment of the present invention for achieving the above object of the present invention, a housing, a first lens portion moving in the optical axis direction in the housing, a second lens moving along the optical axis direction in the housing separately from the first lens portion The first drive unit for moving the first lens unit relative to the housing, the second drive unit for moving the second lens unit relative to the housing, the first position detection sensor for detecting the position of the first lens unit moved by the first drive unit, the second A second position sensor for sensing a position of the second lens unit moved by the driver, and a controller for controlling the first driver and the second driver by using signals from the first position sensor and the second position sensor; The method of controlling lens division of a camera module may include: a first control unit for maintaining a linearity between a control distance with respect to a first lens unit and a sensing value of a first position sensor; Storing a second linear movement section that maintains linearity between the control distance and the sensing value of the second position sensor with respect to the type movement section and the second lens unit, and at least one of the first lens unit and the second lens unit Moving, wherein at least one of the first lens unit and the second lens unit is zoomed to be positioned in a corresponding first linear movement section or second linear movement section, respectively, and zooming of the first lens unit and the second lens unit The method may include focusing control by using the lens unit positioned in the first linear movement section or the second linear movement section. Here, the first linear moving section and the second linear moving section may be interconnected.

Since the camera module of the present invention uses a section having excellent linearity in the driving unit, even if the moving distance of the lens unit increases in millimeter units for the zooming function, position control and focus adjustment can be performed accurately.

In addition, the camera module of the present invention divides a sensing value of a hall sensor or the like to use a section having good linearity and ensure stable linearity in the entire moving section of the lens.

1 is a view for explaining an external structure of a camera module for lens division control according to an embodiment of the present invention.
FIG. 2 is a diagram for describing an internal structure of a camera module for controlling lens division of FIG. 1.
3 is a view for explaining a cross-section of the camera module for the lens segmentation control of FIG.
4 is a view for explaining an exploded internal structure of the lens split camera module of FIG.
5 is a view for explaining an operating mechanism of the camera module for lens segmentation control according to an embodiment of the present invention.
6 is a view for explaining the operating mechanism of the camera module for lens segmentation control according to an embodiment of the present invention.
7 is a view for explaining a camera module and its operating mechanism for lens segmentation control according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. For reference, in the present description, the same numbers refer to substantially the same elements, and the contents described in other drawings under the above rules may be cited and described, and the contents determined to be obvious to those skilled in the art or repeated may be omitted.

1 is a view for explaining the external structure of the camera module for lens segmentation control according to an embodiment of the present invention, Figure 2 is a view for explaining the internal structure of the camera module for lens segmentation control of FIG. 3 is a view for explaining a cross section of the camera module for the lens segmentation control of Figure 1, Figure 4 is a view for explaining an exploded internal structure of the lens segmentation camera module of FIG. 5 is a view for explaining an operating mechanism of the camera module for lens segmentation control according to an embodiment of the present invention.

1 to 5, the camera module 100 according to the present embodiment includes a housing 110, a first lens module 130, a second lens module 150, and a controller.

The housing 110 includes an upper cover 112 and a base 114, and the first support part 122 and the second lens module 150 for supporting the first lens module 130 are mounted on the base 114. The second support part 124 for supporting is formed. The first support part 122 supports the first lens module 130 on the first inner surface 126, and the second support part 124 supports the second lens module 150 on the second inner surface 128. do.

A prism 116 may be provided on one side of the housing 110 to enter incident light to reflect or refract light, and an image sensor 118 may be provided on the opposite side of the housing 110.

The first lens module 130 is mounted on the first lens fixing part 132 and the first lens fixing part 132 that move from side to side along the first inner surface 126 on one side of the housing 110. It includes a portion 140, the second lens module 150 is a second lens fixing portion 152 and the second lens fixing portion (152) which moves from side to side along the second inner surface 128 on one side of the housing 110 ( The second lens unit 160 mounted on the 152 is included.

A fixed lens unit 170 is provided between the first lens unit 140 and the second lens unit 160, and the first lens unit 140 and the second lens, respectively, are horizontally formed around the fixed lens unit 170. The unit 160 may be provided to slide left and right along the optical axis OA.

The first driver 180 may be provided between the first lens module 130 and the housing 110. The first driver 180 is mounted on the first inner surface 126 of the housing 110 to face the first magnet 184 and the first magnet 184 mounted on the first lens fixing part 132. A coil 182. In addition, a plurality of balls are provided on the first lens fixing part 132 and the first inner surface 126, and the balls are partially accommodated in a pocket rail capable of guiding a rolling direction and thus the slide of the first lens module 130. You can guide the movement. In addition, a first hall sensor 186 may be provided adjacent to the first coil 182 to function as a position detection sensor of the first magnet 184.

Similarly, a second driver 190 may be provided between the second lens module 150 and the housing 110. The second driver 190 is mounted on the second inner surface 128 of the housing 110 to face the second magnet 194 and the second magnet 194 mounted on the second lens fixing part 152. A coil 192. In addition, similar to the first driving unit 180, a plurality of balls and pocket rails for the same are formed on the second lens fixing unit 152 and the second inner surface 128 to guide the movement of the second lens module 150. have. The second hall sensor 196 may be provided adjacent to the second coil 192.

In the present embodiment, the first and second coils 182 and 192 may be provided with a left and right width of about 4 to 6 mm, and the first and second magnets 184 and 194 may also be provided to have a left and right length of 8 to 12 mm. There is a number. This is a considerably longer section than the actuator of the magnet and coil combination which controls only a movement section of about 0.3 mm in the related art. In this embodiment, a section in which the signal output of the hall sensor does not have linearity may appear as the magnet moves. Problems may arise.

To this end, the camera module according to the present embodiment distinguishes and moves the zoom movement and the focus control, and uses the lens module having two magnetic characteristics to control the focus using only a section having excellent linearity. Can be.

For reference, in the present exemplary embodiment, the lens section may be formed of a single lens or two or more lens groups. In the present exemplary embodiment, the lens section may be formed of a single lens or two or more lens groups. 190 is provided in a combination of the same coil and magnet, but may be provided in a combination of coils and magnets of different sizes, and the principle of operation may also be provided using various elements such as different piezoelectric elements and ultrasonic elements.

As shown, in the present embodiment, the first lens module 130 and the second lens module 150 are provided around the fixed lens unit 170, and the first lens module 130 and the second lens module ( 150 may perform zoom movement for zoom and focus control for autofocus. In the case of the zoom movement, at least one of the first lens unit 140 and the second lens unit 160 may move left and right to match the designed zoom magnification. After the zoom movement, the first lens unit 140 or the second lens unit 160 positioned in the charge section may be finely adjusted to perform focus control.

In general, the first lens unit 140 or the second lens unit 160 may be finely adjusted within a range of about 160 μm for focus control. In the conventional camera module, since the autofocus actuator controls the position of the lens carrier finely within a range of about 160 μm, the Hall sensor used can also be preset in an area having excellent linearity, thereby precisely adjusting the lens carrier. There was no need to consider the case where the linearity is reduced.

However, in the present embodiment, since the first lens module 130 or the second lens module 150 can move from about 2 mm to 7.5 mm for zoom movement, the coil used in the conventional autofocus actuator or the anti-shake actuator A much longer coil may be used, and even in the same coil, the linearity between the control distance of the lens module and the signal of the Hall sensor may be greatly reduced at a specific position where the first lens module 130 or the second lens module 150 stops. Cases may occur.

Referring to FIG. 5, the first hall sensor 186 and the second hall sensor based on the control distance between the first lens unit 140 and the second lens unit 160 around the fixed lens unit 170 in the center ( The linearity of 196) can be expressed as shown. In the x-y graphs of FIGS. 5B and 5C, the x axis may be a displacement of the magnet with respect to the center of the hall sensor, and the y axis may be a signal strength of the hall sensor according to the x displacement.

Referring to FIG. 5B, the linearity between signals output from the first hall sensor 186 according to the control distance of the first lens unit 140 is illustrated in a graph. Referring to this, the first lens unit 140 of the first lens module 130 may have a first movable section MD1, and the first movable section MD1 may have a first linear moving section having excellent linearity. (LR1-1, LR1-2) and the first neutral period NR1 having poor linearity. In general, the first neutral period NR1 may be formed around the first neutral point NP1 where the centers of the first coil 182 and the first magnet 184 coincide with each other.

For reference, the excellent linearity in the present specification means that the output signal change of the Hall sensor according to the control distance is constant, and that the linearity is low, the output signal change of the Hall sensor according to the control distance is not constant or the slope is low. It can be said that the case.

The first linear movement sections LR1-1 and LR1-2 are also divided to the left and right about the first neutral section NR1, and the first charge section among the first linear movement sections LR1-1 and LR1-2. (I) and the third charge section III may be defined. Accordingly, although the first lens unit 140 has excellent linearity of the first Hall sensor 186 different in the control distance in the first linear moving sections LR1-1 and LR1-2, the first lens unit 140 can precisely control the position control. In the first neutral period NR1, the linearity cannot be precisely controlled. Therefore, when focus control is performed on the first lens unit 140 in a state where the first lens unit 140 is positioned in the first neutral period NR1, a case in which focus is not well achieved may occur.

Referring to FIG. 5C, the linearity between signals output from the second hall sensor 196 according to the control distance of the second lens unit 160 is illustrated in a graph. Referring to this, the second lens unit 160 of the second lens module 150 may have a second movable section MD2, and the second movable section MD2 has a second linear moving section having excellent linearity. (LR2-1, LR2-2) and the second neutral period NR2 having poor linearity. Here, the second neutral period NR2 may be formed around the second neutral point NP2 where the centers of the second coil 192 and the second magnet 194 coincide with each other.

The second linear moving sections LR2-1 and LR2-2 are also separated from left and right around the second neutral section NR2, and the second responsible section among the second linear moving sections LR2-1 and LR2-2. (II) and the fourth charge section (IV) can be defined. Accordingly, although the second lens unit 160 has excellent linearity of the second Hall sensor 196 different in the control distance in the second linear movement sections LR2-1 and LR2-2, the position control can be precisely controlled. In the second neutral period NR2, the linearity is poor and position control cannot be precisely controlled. Therefore, if focus control is performed on the second lens unit 160 while the second lens unit 160 is located in the second neutral period NR2, a case in which focus is not well achieved may occur.

Here, the second linear moving sections LR2-1 and LR2-2 are preferably not the same as the first linear moving sections LR1-1 and LR1-2, and preferably, the second linear moving sections LR2-. 1 and LR2-2 may connect the first linear movement sections LR1-1 and LR1-2 between the first neutral period NR1, that is, between the first linear movement sections LR1-1 and LR1-2. It is good to be formed in the range of a degree. Therefore, the first linear movement sections LR1-1 and LR1-2 and the second linear movement sections LR2-1 and LR2-2 are interconnected to form the entire movement section TMD in which the lens unit can move. The controller (not shown) may use the first charge section (I), the second charge section (II), the third charge section (III), and the fourth charge section (IV) as a sensing area, about 4 mm or Excellent linearity can be secured in the entire moving section TMD of the longer section.

In the present exemplary embodiment, the charge intervals for sensing are divided into four, but in some cases, the charge intervals may be divided into two divisions or three divisions, and a division of five divisions or more may be defined by further adding a lens unit.

To this end, the controller designs a linear moving section having excellent linearity by using the linearity between the control distances of the first lens unit 140 and the second lens unit 160 and the signal of the Hall sensor, and uses it as a sensing region. The first charge section I to the fourth charge section IV may be stored in advance.

Therefore, the controller may first perform the zoom movement with respect to the first lens unit 140 and the second lens unit 160 according to the magnification for the optical zoom, and then the first lens unit 140 and the second lens unit 160. The focus control may be performed using the lens unit positioned in the charge section of the lens unit 160.

The controller may move at least one of the first lens unit 140 and the second lens unit 160 to move the zoom. However, the first lens unit 140 and the second lens unit 160 are moved, but at least one of them is zoomed so as to be positioned in the first charge section I to the fourth charge section IV stored in advance. can do. In the present exemplary embodiment, the first lens unit 140 and the second lens unit 160 are both positioned in respective neutral sections, that is, the first neutral section NR1 and the second neutral section NR2 through zoom movement. May be excluded.

The focus control may be performed by using a lens unit positioned in a stored charge section among the zoomed first lens unit 140 and the second lens unit 160. Here, one of the first lens unit 140 or the second lens unit 160 may be located in the first charge section I to the fourth charge section IV, and both may be located in the charge section.

When the first lens unit 140 is located in the first charge section I or the third charge section III, and the second lens unit 160 is located in the second charge section II, the control unit may be one of them. You can select one to use for focus control.

In the present exemplary embodiment, the first lens module 130 and the second lens module 150 are provided at both sides with respect to the fixed lens unit 170. In another embodiment, the first lens unit and the second lens unit are provided at one side of the fixed lens unit. The lens unit may be provided together.

6 is a view for explaining the operating mechanism of the camera module for lens segmentation control according to an embodiment of the present invention.

Referring to FIG. 6, the first neutral point NP1 ′ and the second coil 192 ′ and the second magnet 194 ′ where the centers of the first coil 182 ′ and the first magnet 184 ′ coincide with each other are illustrated. A second neutral point NP2 ′ where the centers of the coincides with each other may be defined. In order that the first linear moving sections LR1-1 and LR1-2 and the second linear moving sections LR2-1 and LR2-2 are not equal to each other or are mutually connected to complement the neutral section, the first neutral point It is preferable that NP1 and the second neutral point NP2 are spaced apart in the optical axis direction.

In the camera module including the conventional zoom function, if two driving units are arranged side by side with respect to the optical axis direction, one driving unit is responsible for zoom movement and the other is for focus control, the camera according to the present embodiment. In the module, the first driver 180 'and the second driver 190' may be arranged in parallel with respect to the optical axis or on another surface, and both may be involved in zoom movement and focus control. It may be.

For example, in the lens of the driving unit for zoom movement in the camera module including the conventional zoom function, there is a neutral point of inferior linearity, and since two lenses are used because one lens is responsible for zoom movement over the entire region. The size may be longer than that of the camera module which performs the zoom movement, or may be disadvantageous in miniaturization, and difficulty in controlling may still occur in a section in which linearity is reduced.

However, in the present embodiment, the first neutral point NP1 ′ and the second neutral point NP2 ′ are spaced to the left and right, and both points are spaced apart by a predetermined interval along the optical axis direction. Therefore, even if the combination of the same magnet and the hall sensor, the linear movement section can be provided partially intersecting, it is possible to ensure a stable linearity in the entire stroke section by using the section having excellent linearity as the charge section.

7 is a view for explaining a camera module and its operating mechanism for lens segmentation control according to an embodiment of the present invention.

Referring to FIG. 7, the camera module 200 according to the present exemplary embodiment may include a housing, a first lens unit 240, a second lens unit 260, and a fixed lens unit 270. In the present exemplary embodiment, the first lens unit 240 and the second lens unit 260 may be provided at one side, and the fixed lens unit 270 may be provided at one side adjacent to the incident light.

At the rear of the fixed lens unit 270, the first lens unit 240 and the second lens unit 260 may slide left and right or back and forth along the optical axis OA.

The first lens unit 240 and the second lens unit 260 are disposed on the right side with respect to the fixed lens unit 270 on the left side, and are disposed at the control distance of the first lens unit 240 and the second lens unit 260. The linearity of the first Hall sensor (not shown) and the second Hall sensor (not shown) can be represented as shown in the figure. In the x-y graphs of FIGS. 7B and 7C, the x axis may be a displacement of the magnet with respect to the center of the hall sensor, and the y axis may be a signal strength of the hall sensor according to the x displacement.

Referring to FIG. 7B, the first lens unit 240 may have a first movable section MD1, and the first movable section MD1 may have a first linear moving section LR1 having excellent linearity. -1, LR1-2) and the first neutral period NR1 having poor linearity. The first charge section I and the third charge section III may be defined to correspond to the first linear movement sections LR1-1 and LR1-2 of the entire movement section TMD.

Referring to FIG. 7C, the second lens unit 260 may have a second movable section MD2, and the second movable section MD2 has a high linearity second linear moving section LR2. -1, LR2-2) and a second neutral period NR2 having poor linearity. Also, the third charge section III may be defined to correspond to the second linear movement section LR1-1 of the entire movement section TMD.

The controller (not shown) may use the first charge section I, the second charge section II, and the third charge section III as the sensing area, and are excellent in the entire moving section TMD of about 4 mm or more. Linearity can be secured.

The control unit designs a linear moving section having excellent linearity by using the linearity between the control distances of the first lens unit 240 and the second lens unit 260 and the signal of the Hall sensor, and among them, the control unit includes a first moving unit for the sensing region. The charge section I to the fourth charge section IV may be stored in advance. Accordingly, the controller may first perform a zoom movement with respect to the first lens unit 240 and the second lens unit 260 according to the magnification for the optical zoom, and then the first lens unit 240 and the second lens unit 260. The focus control may be performed using the lens unit positioned in the charge section of the lens unit 260.

In the present embodiment, the control unit may be mounted on a PCB on which a coil or the like is mounted, but in some cases, the control unit may be provided in the same way as a chip having a hall sensor function.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

100: camera module 110: housing
130: first lens module 140: first lens unit
150: second lens module 160: second lens unit
170: fixed lens unit 180: first drive unit
190: second drive unit

Claims (19)

In the camera module for lens segmentation control,
housing;
A first lens unit moving in the optical axis direction in the housing;
A second lens unit moving along the optical axis direction in the housing separately from the first lens unit;
A first driving unit moving the first lens unit with respect to the housing;
A second driving unit which moves the second lens unit with respect to the housing; And
And a controller for controlling the first driver and the second driver.
And the control unit stores different charge sections for the first lens unit and the second lens unit among the movable sections of the first lens unit and the second lens unit. The method of claim 1,
The controller moves at least one of the first lens unit and the second lens unit according to a magnification for photographing, and at least one of the first lens unit and the second lens unit is zoomed to be positioned in the charge section. And focus control is performed using a lens unit positioned in the charge section among the zoomed first lens unit and the second lens unit. The method of claim 1,
The movable section is a camera module for lens division control, characterized in that 2mm ~ 7.5mm. The method of claim 1,
The charge section may be selected according to a linear movement section that maintains linearity between a control distance of the lens unit in charge of the first and second lens units and a sensing value of a position sensing sensor of a driver corresponding to the lens unit in charge. Camera module for lens segmentation control characterized in that. In the camera module for lens segmentation control,
housing;
A first lens unit moving in the optical axis direction in the housing;
A second lens unit moving along the optical axis direction in the housing separately from the first lens unit;
A first driving unit moving the first lens unit with respect to the housing;
A second driving unit which moves the second lens unit with respect to the housing;
A first position sensor for sensing a position of the first lens unit moved by the first driver; And
And a second position detection sensor configured to detect a position of the second lens unit moved by the second driving unit.
The first lens unit includes a first linear movement section that maintains linearity between a control distance and a sensing value of the first position sensor, and the second lens unit is between a control distance and a sensing value of the second position sensor. A second linear moving interval that maintains linearity in,
And the first linear movement section and the second linear movement section are not the same. In the camera module for lens segmentation control,
housing;
A first lens unit moving in the optical axis direction in the housing;
A second lens unit moving along the optical axis direction in the housing separately from the first lens unit;
A first driving unit moving the first lens unit with respect to the housing;
A second driving unit which moves the second lens unit with respect to the housing;
A first position sensor for sensing a position of the first lens unit moved by the first driver; And
And a second position detection sensor configured to detect a position of the second lens unit moved by the second driving unit.
The first lens unit includes a first linear movement section that maintains linearity between a control distance and a sensing value of the first position sensor, and the second lens unit is between a control distance and a sensing value of the second position sensor. A second linear moving interval that maintains linearity in,
And the first linear moving section and the second linear moving section are connected to each other. In the camera module for lens segmentation control,
housing;
A first lens unit moving in the optical axis direction in the housing;
A second lens unit moving along the optical axis direction in the housing separately from the first lens unit;
A first driving unit moving the first lens unit with respect to the housing;
A second driving unit which moves the second lens unit with respect to the housing; And
And a controller configured to control zoom movement and focus control of the first lens unit and the second lens unit by using the first driver and the second driver.
The control unit may include a driving unit for maintaining linearity among the first driving unit and the second driving unit according to the zoom movement for moving at least one of the first lens unit and the second lens unit for the optical zoom, and the zoom movement position. Selecting a driver, and performing focus control using the selected first driver or the second driver. The method of claim 7, wherein
A first linear movement section for maintaining linearity between the control distance and the sensing value of the first position sensor is defined with respect to the first lens unit, and the control distance and the second position sensor of the second lens unit are defined. A second linear moving interval is defined that maintains linearity between the sensed values,
The control unit selects the first lens unit for the focus control when the first lens unit is in the first linear movement section after the zoom movement or the focus control when the second lens unit is in the second linear movement section. The camera module for lens division control, characterized in that for selecting the second lens unit. In the camera module for lens segmentation control,
housing;
A first lens module facing the first inner surface of the housing and including a first lens fixing portion moving along the first inner surface in the optical axis direction and a first lens portion fixed to the first lens fixing portion and positioned on the optical axis ;
A second lens module facing the second inner surface of the housing and including a second lens fixing portion moving along the second inner surface in the optical axis direction and a second lens portion fixed to the second lens fixing portion and positioned on the optical axis; ;
A first coil provided on one side of the first inner surface of the housing and the first lens fixing part, and a first magnet provided on the other side corresponding to the first coil, wherein the first lens part is disposed with respect to the housing. A first driving unit to move; And
A second coil provided on one side of the second inner surface of the housing and the second lens fixing part and a second magnet provided on the other side corresponding to the second coil to move the second lens part; It includes a drive;
And a first neutral point at which the centers of the first coil and the first magnet coincide with each other and are spaced apart in the optical axis direction with respect to a second neutral point at which the centers of the second coil and the second magnet coincide with each other. Camera module for split control. The method of claim 9,
And the first inner surface and the second inner surface face each other. The method according to any one of claims 1, 5, 6, 7, and 9,
And a fixed lens unit fixed to the optical axis in the housing separately from the first lens unit and the second lens unit. The method of claim 11,
And the first lens unit and the second lens unit are provided at one side with respect to the fixed lens unit. The method of claim 11,
The camera module for lens division control, wherein the first lens unit and the second lens unit are provided at both sides of the fixed lens unit. The method according to any one of claims 1, 5, 6, 7, and 9,
A prism is provided at an entrance of the housing, and the housing and the optical axis are oriented perpendicular to a line connecting the subject and the prism. A housing, a first lens unit moving in the optical axis direction from the housing, a second lens unit moving along the optical axis direction in the housing separately from the first lens unit, a first driving unit moving the first lens unit relative to the housing, In the lens segment control method of the camera module comprising a second drive unit for moving the second lens unit relative to the housing, and a control unit for controlling the first drive unit and the second drive unit,
The control unit storing different charge sections for the first lens unit and the second lens unit;
At least one of the first lens unit and the second lens unit is moved according to a magnification for photographing, and at least one of the first lens unit and the second lens unit is zoomed to be positioned in the defined charge section. step; And
And focusing control by using the lens unit positioned in the charge section among the zoomed first lens unit and the second lens unit. The method of claim 15,
The controller stores the other charge section for each of the first lens unit and the second lens unit among the movable sections of the first lens unit and the second lens unit, and the movable section is 2 mm to 7.5 mm. Lens division control method of a camera module, characterized in that. The method of claim 15,
The charge section may be selected according to a linear movement section that maintains linearity between a control distance of the lens unit in charge of the first and second lens units and a sensing value of a position sensing sensor of a driver corresponding to the lens unit in charge. Lens division control method of a camera module characterized in that. A housing, a first lens unit moving in the optical axis direction from the housing, a second lens unit moving along the optical axis direction in the housing separately from the first lens unit, a first driving unit moving the first lens unit relative to the housing, A second driving unit for moving the second lens unit with respect to the housing, a first position detecting sensor for detecting a position of the first lens unit moving by the first driving unit, and a position of the second lens unit moving by the second driving unit And a second position detecting sensor for detecting a light and a control unit controlling the first driving unit and the second driving unit by using signals from the first position detecting sensor and the second position detecting sensor. In the control method,
The control unit may include a first linear moving section that maintains linearity between a control distance with respect to the first lens unit and a sensing value of the first position detecting sensor, and a control distance with respect to the second lens unit and the second position detecting sensor. Storing a second linear moving interval maintaining linearity between the sensing values of?
At least one of the first lens unit and the second lens unit is moved, and at least one of the first lens unit and the second lens unit is respectively in the corresponding first linear movement section or the second linear movement section. Zooming to position; And
And focus control by using a lens unit positioned in the first linear movement section or the second linear movement section by zoom movement of the first lens unit and the second lens unit.
The method of claim 1, wherein the first linear movement section and the second linear movement section are not the same. A housing, a first lens unit moving in the optical axis direction from the housing, a second lens unit moving along the optical axis direction in the housing separately from the first lens unit, a first driving unit moving the first lens unit relative to the housing, A second driving unit for moving the second lens unit with respect to the housing, a first position detecting sensor for detecting a position of the first lens unit moving by the first driving unit, and a position of the second lens unit moving by the second driving unit And a second position detecting sensor for detecting a light and a control unit controlling the first driving unit and the second driving unit by using signals from the first position detecting sensor and the second position detecting sensor. In the control method,
The control unit may include a first linear moving section that maintains linearity between a control distance with respect to the first lens unit and a sensing value of the first position detecting sensor, and a control distance with respect to the second lens unit and the second position detecting sensor. Storing a second linear moving interval maintaining linearity between the sensing values of?
At least one of the first lens unit and the second lens unit is moved, and at least one of the first lens unit and the second lens unit is respectively in the corresponding first linear movement section or the second linear movement section. Zooming to position; And
And focus control by using a lens unit positioned in the first linear movement section or the second linear movement section by zoom movement of the first lens unit and the second lens unit.
The method of claim 1, wherein the first linear movement section and the second linear movement section are interconnected.

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