KR102090827B1 - Camera module and flat-type coil for long stroke - Google Patents

Abstract

A camera module including a first body, a second body moving relative to the first body, and a magnet fixed to the first body includes a flat coil mounted on the second body in response to the magnet, and the flat coil Silver substrate and a wire pattern formed on the substrate, the wire pattern includes a longitudinal pattern provided parallel to the movement direction of the first body and a transverse pattern provided to intersect the movement direction of the first body, The average line width of the directional pattern may be formed wider than that of the lateral pattern.

Description

Flatbed coil for camera module and long stroke control {CAMERA MODULE AND FLAT-TYPE COIL FOR LONG STROKE}

The present invention relates to a camera module for controlling a long stroke of a lens, and more specifically, a camera module having an improved structure to realize a camera module requiring a long stroke area, such as an optical zoom function, and the like, which can be used for such a use It relates to a flat coil.

When a subject is photographed, a camera module having an auto focusing (AF) function in which the lens focus is automatically adjusted is widely applied to a mobile device such as a mobile phone or a tablet PC as well as a general digital camera.

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

However, optical zoom implemented in a large camera or a professional camera is difficult to implement in a small camera module. Because, in order to realize optical zoom, the lens needs to move along the optical axis, and it is difficult to secure a space for the lens to move, and even after moving the lens 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 for focus after moving.

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

A camera module is disclosed in Chinese Patent Publication No. CN 101566714 (published Oct. 28, 2009). Looking at the camera module, it includes two lens groups, and the first actuator and the second actuator include moving the lens in the photographing direction.

Korean Registered Patent No. 10-1586244 (registered on January 12, 2016) discloses a camera module with a zoom function. Looking at the camera module, the incident light is reflected using a reflector, and a structure in which the autofocus lens and the zoom lens are separated is presented.

The present invention provides a flat coil capable of maintaining a small coil resistance and a camera module including the same, in which case the length of the coil may increase as the moving distance of the lens unit increases in millimeters for a zoom function or the like. .

According to an exemplary embodiment of the present invention for achieving the objects of the present invention described above, a camera including a first body, a second body moving relative to the first body, and a magnet fixed to the first body The module includes a flat coil mounted on the second body in correspondence with the magnet, the flat coil includes a substrate and a wire pattern formed on the substrate, and the wire pattern is provided in parallel to a movement direction of the first body It includes a pattern and a transverse pattern provided to intersect the movement direction of the first body, the average line width of the longitudinal pattern may be formed wider than the line width of the transverse pattern.

Here, the longitudinal pattern may include a connection portion formed at both ends and a connection portion connected to the transverse pattern, and may include an extension portion formed wider than the line width of the connection portion and the transverse pattern.

According to the prior art, the maximum movement distance of the lens carrier in the actuator for autofocus control only is about 300µm, and in fact, the movement distance by the combination of coil and magnet in autofocus control is about 160µm. Therefore, as in the prior art, the coil used in the actuator for automatic focus control only uses a thin wire of the same thickness by winding, and both the longitudinal and transverse widths are the same.

However, in order to implement a zoom function or the like in a small camera module, the moving distance of the lens unit may be increased in millimeters, and in fact, it may occur that it is necessary to accurately move about 2 to 7.5 mm. To this end, the conventional coil may be formed to have a length of 2 to 3 times or more along the moving direction of the lens carrier or the like.

However, when the longitudinal length of the coil increases, the resistance of the coil increases, and if the number of turns is reduced to reduce the resistance of the coil, the electromagnetic force also decreases, which may be a problem.

In this embodiment, a flat coil including a substrate and a wire pattern formed on a substrate is provided, but the average line width of the longitudinal pattern in the wire pattern is formed wider than the line width of the transverse pattern, thereby increasing the coil's longitudinal length. It can be prevented from increasing the resistance of the, it is possible to overcome the reduction in electromagnetic force by maintaining the number of turns of the transverse pattern affecting the electromagnetic force.

By using a flat coil, it is possible to extend the length of the longitudinal pattern from 4mm to 8mm, and it can be applied as a coil to implement a zoom function.

According to an exemplary embodiment of the present invention for achieving the objects of the present invention described above, the flat coil includes a substrate and a wire pattern formed on the substrate, the wire pattern being relatively shorter than the longitudinal pattern and the longitudinal pattern Including a transverse pattern, the average line width of the longitudinal pattern may be formed wider than the line width of the transverse pattern.

The longitudinal pattern connects between the connecting portion formed at both ends and the connecting portion so as to be connected to the transverse pattern, and may include a connecting portion and an extension formed wider than the line width of the transverse pattern, and the connecting portion may be formed with the same line width as the line width of the transverse pattern. You can.

For the zoom function, as the moving distance of the lens unit increases in millimeters, the length of the coil required for the camera module may need to be increased. In the camera module of the present invention, a flat coil is applied, and the wire pattern of the flat coil is longitudinally oriented. By forming the average line width of the pattern wider than the line width of the transverse pattern, the resistance of the coil can be prevented from increasing even when the longitudinal length of the coil increases, and the number of turns of the transverse pattern affecting the electromagnetic force is maintained to maintain the electromagnetic force Can overcome the reduction.

1 is a view for explaining the external structure of a camera module including a flat coil according to an embodiment of the present invention.
FIG. 2 is a view for explaining the internal structure of the camera module including the flat coil of FIG. 1.
3 is a view for explaining an exploded internal structure of the camera module including the flat coil of FIG. 1.
4 is a view for comparing a conventional coil and a flat coil according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view illustrating the camera module of FIG. 1 and a flat coil mounted to the camera module.
6 is a cross-sectional view for explaining a camera module and a flat coil mounted to the camera module 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 can be cited and described, and repeated contents that are determined or apparent to those skilled in the art may be omitted.

1 is a view for explaining the external structure of a camera module including a flat coil according to an embodiment of the present invention, Figure 2 is a view for explaining the internal structure of a camera module including a flat coil of Figure 1 , FIG. 3 is a view for explaining an exploded internal structure of the camera module including the flat coil of FIG. 1, and FIG. 4 is a drawing for comparing a flat coil according to an embodiment of the present invention with a conventional coil, FIG. 5 is a cross-sectional view illustrating the camera module of FIG. 1 and a flat coil mounted to the camera module.

1 to 5, the camera module 100 according to the present embodiment may include a housing 110, a first lens module 130, a second lens module 150, and a control unit.

The housing 110 includes an upper cover 112 and a base 114, and on the base 114, a first support portion 122 and a second lens module 150 for supporting the first lens module 130 are provided. A second support 124 for support 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 where incident light enters the housing 110 to reflect or refract light, and an image sensor 118 may be provided on the opposite side.

The first lens module 130 is a first lens mounted on the first lens fixing portion 132 and the first lens fixing portion 132 moving from side to side along the first inner surface 126 on one side of the housing 110 The second lens module 150 includes a second lens module 150 and a second lens holder 152 that moves from side to side along the second inner surface 128 from one side of the housing 110. 152) includes a second lens unit 160.

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 are respectively left and right with respect to the fixed lens unit 170. A portion 160 is provided to move the slide from side to side along the optical axis OA.

A first driving unit 180 may be provided between the first lens module 130 and the housing 110. The first driving unit 180 includes a first magnet 184 mounted on the first lens fixing unit 132 and a first magnet mounted on the first inner surface 126 of the housing 110 opposite the first magnet 184. It includes a flat coil 300. 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 the rolling direction, and the slide of the first lens module 130 is provided. Can guide movement. In addition, a first hall sensor 186 is provided adjacent to the first flat coil 300 to function as a position sensing sensor of the first magnet 184.

Similarly, a second driving unit 190 may be provided between the second lens module 150 and the housing 110. The second driving unit 190 is mounted on the second inner surface 128 of the housing 110 opposite to the second magnet 194 and the second magnet 194 mounted on the second lens fixing unit 152. It includes a flat coil 302. In addition, a plurality of balls and a pocket rail for them are formed on the second lens fixing part 152 and the second inner surface 128 like the first driving part 180 to guide the movement of the second lens module 150. have. Also, a second Hall sensor 196 may be provided adjacent to the second flat coil 302.

In this embodiment, the first and second flat coils 300 and 302 may be provided with left and right widths of about 4 to 6 mm, and the first and second magnets 184 and 194 also have left and right lengths of 8 to 12 mm. Can be.

For reference, the auto focus of the conventional camera module without the zoom function uses a magnet and coil combination that controls only a moving section of about 0.3 mm. However, when the moving distance is increased to 4 to 7 mm, there may be problems that have not been a problem in terms of linearity and coil resistance.

Referring to FIG. 4 (a), the coil wound around the wire according to the conventional method has the strength of electromagnetic force by the number of windings of the wire passing through the region II extending laterally regardless of the region I extending longitudinally. Can be determined. However, since the wires of the same thickness are used, the width and thickness of the I region and the II region must be the same. At the same time, as the longitudinal length of the coil increases, the resistance of the coil increases, so the current decreases as opposed to the resistance, and the electromagnetic force may decrease at the same number of turns.

Referring to (b) of FIG. 4, the flat coil 300 according to the present embodiment is mounted on the first support 122 of the housing 110 as a second body, and corresponds to the flat coil 300. The first magnet 184 may be mounted on the first lens fixing part 132 which is the body.

The flat coil 300 may include a substrate 310 such as a flexible substrate and a wire pattern 320 formed on the substrate 310. The wire pattern 320 may be formed on the substrate 310 through a method such as photoresist.

In this embodiment, the wire pattern 320 is provided to be perpendicular to the direction of movement of the longitudinal pattern 330 and the first lens fixing unit 132 provided in parallel to the moving direction of the first lens fixing unit 132 The direction pattern 340 may be included.

The longitudinal pattern 330 is connected to the transverse pattern 340, and the longitudinal pattern 330 and the transverse pattern 340 are interconnected to each other to form a coil pattern that is connected as a whole. The longitudinal pattern 330 may include a connecting portion 332 connected to the transverse pattern 340 at both ends, and an extension portion 334 connecting between the connecting portions 332.

In the longitudinal pattern 330, the connecting portion and the extending portion may be formed with the same line width, or may be formed with different line widths, but the average line width is preferably formed wider than the line width of the transverse pattern 340.

To this end, in this embodiment, the width w2 of the expansion portion 334 is formed to be larger than the width w1 of the connection portion 332, and the length thereof can also be formed to be longer than the connection portion 332. have. In this way, the average line width of the longitudinal pattern 330 can be formed larger than the line width of the transverse pattern 340, and the increase in resistance caused by the longitudinal pattern 330 can be limited.

According to the drawing, in the wire pattern 320, the overall width I of the longitudinal pattern 330 can be designed to be wider than the overall width II of the transverse pattern 340, and the longitudinal pattern 330 By forming the width wide, it is possible to form a large current value at the same voltage.

In addition, instead of forming the line width of the transverse pattern 340 narrower, the average line width of the longitudinal pattern 330 may not be increased to significantly change the overall resistance value, and the number of turns by the transverse pattern 340 may be reduced. It is also possible to further enhance the electromagnetic force.

Of course, in this embodiment, the wire pattern 320 is formed on the substrate 310 as a single layer, but the substrate may be provided in a plurality of stacked forms, and a plurality of layers using a stacked substrate and via holes It is also possible to further increase the number of turns by interconnecting the wire patterns of.

For reference, in this embodiment, the lens section may be formed of a single lens or two or more lens groups, and in this embodiment, the first driving unit 180 and the second driving unit 190 is provided with a combination of the same coil and magnet, but may be provided with a combination of coils and magnets of different sizes, and the operating principle may also be provided using various elements such as piezoelectric elements and ultrasonic elements.

6 is a cross-sectional view for explaining a camera module and a flat coil mounted to the camera module according to an embodiment of the present invention.

Referring to FIG. 6, 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 this embodiment, the first lens unit 240 and the second lens unit 260 are provided on one side, and the fixed lens unit 270 may be provided on one side adjacent to incident light.

The first lens unit 240 and the second lens unit 260 are disposed on the right side of the fixed lens unit 270 on the left side, and the first lens unit 240 and the second lens are disposed behind the fixed lens unit 270. The lens unit 260 may move the slide left and right or back and forth along the optical axis OA.

The first neutral point where the centers of the first flat coil 300 and the first magnet 184 coincide and the second neutral point where the centers of the second flat coil 302 and the second magnet 194 coincide are in the optical axis direction. Can be separated from each other.

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 responsible for focus control, the camera according to the present embodiment In the module, the first driving unit 180 and the second driving unit 190 may be arranged in parallel about the optical axis or may be disposed on different surfaces, and both may be distinguished in that they may be involved in zoom movement and focus control. .

For example, in the camera module including the conventional zoom function, there is a neutral point in which the linearity is poor even in the lens of the driving unit responsible for zoom movement, and since one lens is responsible for zoom movement across the bulbs, two lens units are used. It may be longer in size or disadvantageous in miniaturization than a camera module performing zoom movement, and difficulty in control in a section in which linearity is reduced may still occur.

However, in this embodiment, the first neutral point and the second neutral point are spaced left and right, and both points are spaced a predetermined distance along the optical axis direction. Therefore, even with the combination of the same magnet and hall sensor, a linear movement section may be provided by partially intersecting, and a stable linearity can be secured in all sections of the stroke by using a section having excellent linearity as a section in charge.

In this 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 manner as a chip having a hall sensor function.

As described above, although described with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You 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 driving unit 300, 302: flat coil

Claims (10)

In the camera module including a first body, a second body moving relative to the first body, and a magnet fixed to the first body,
It includes a flat coil mounted to the second body corresponding to the magnet,
The flat coil includes a substrate and a wire pattern formed on the substrate,
The wire pattern includes a longitudinal pattern provided in parallel to the movement direction of the first body and a transverse pattern provided to intersect the movement direction of the first body, wherein an average line width of the longitudinal pattern is the transverse Formed wider than the line width of the direction pattern,
The longitudinal pattern is a camera module characterized in that it comprises a connecting portion formed at both ends so as to be connected to the transverse pattern, and an extension formed wider than the line width of the connecting portion and the transverse pattern. delete According to claim 1,
The connection unit is a camera module, characterized in that formed in the same line width as the line width of the transverse pattern. According to claim 1,
Wherein the longitudinal pattern is longer than the transverse pattern. According to claim 1,
The longitudinal pattern is a camera module, characterized in that formed in a length of 4mm ~ 8mm. According to claim 1,
The substrate is provided as a laminated substrate, and the wire pattern is provided on the outer surface or between the laminated substrate of the camera module. In the flat coil,
It includes a substrate and a wire pattern formed on the substrate,
The wire pattern includes a longitudinal pattern and a transverse pattern relatively shorter than the longitudinal pattern, wherein an average line width of the longitudinal pattern is formed wider than that of the transverse pattern,
The longitudinal pattern is a flat coil, characterized in that it comprises a connecting portion formed at both ends so as to be connected to the transverse pattern and the connecting portion and an extension formed wider than the line width of the connecting portion and the transverse pattern. delete The method of claim 7,
The connecting portion is a flat coil, characterized in that formed in the same line width as the line width of the transverse pattern. The method of claim 7,
The substrate is provided as a laminated substrate, the wire pattern is a flat coil, characterized in that provided on the outer surface or between the laminated substrate.

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