KR102195681B1 - Camera module - Google Patents

Abstract

The camera module according to the present embodiment includes a printed circuit board on which an image sensor is mounted; A base disposed above the printed circuit board; A bobbin disposed on the base and reciprocating in parallel with the optical axis; A housing coupled to an upper portion of the base and having a height different from that of the bobbin; And a lower and upper elastic member having one end connected to the bobbin and the other end connected to the housing, and may include a deformable portion formed on at least one of the lower and upper elastic members.

Description

Camera module}

This embodiment relates to a camera module.

As the installation of high-pixel camera modules becomes the main trend in the mobile market, the performance of the camera module is gradually improving. As the performance of the camera module is improved, the battery consumption is greatly increased, and thus, a research on an actuator capable of bidirectional driving of a low-current type for a camera module used in a mobile device is in progress.

The size of the bobbin and the holder member constituting the driving part of such a low-current type bidirectional driving actuator is preferably configured to correspond to each other, but due to tolerances in the design of the camera module and the production stages of each part, the height of each bobbin and holder member is They are often configured differently. In particular, when assembling the bobbin to enable bidirectional driving, sagging of the elastic member or the like occurs due to the self-weight of the bobbin itself, so that the bobbin and the holder member may not be assembled at the correct position.

In addition, when the lengths of the bobbin and the holder member are configured differently, a gap may be generated between the holder member and the elastic member, and foreign matters may flow through the gap. The introduced foreign matter may cause a malfunction of the camera module, and the reliability may decrease, and the assembly may decrease.

The present embodiment provides a camera module having an improved structure to improve reliability according to miniaturization.

The camera module according to the present embodiment includes a printed circuit board on which an image sensor is mounted; A base disposed above the printed circuit board; A bobbin disposed on the base and reciprocating in parallel with the optical axis; A housing coupled to an upper portion of the base and having a height different from that of the bobbin; And a lower and upper elastic member having one end connected to the bobbin and the other end connected to the housing, and may include a deformable portion formed on at least one of the lower and upper elastic members.

According to the first embodiment, the deformation portion may include a first deformation portion formed on the lower elastic member.

A first inflection portion formed at a position close to the bobbin; And a second inflection portion formed at a position close to the housing.

The first inflection portion may form the lower elastic member to be inclined upward, and the second inflection portion may change an inclination angle of the lower elastic member in a horizontal direction.

According to the second embodiment, the deformation portion may include a second deformation portion formed on the upper elastic member.

A third inflection portion formed at a position close to the bobbin; And a fourth inflection part formed at a position close to the housing.

The third inflection portion may form the upper elastic member to be inclined downward, and the fourth inflection portion may change an inclination angle of the upper elastic member in a horizontal direction.

According to a third embodiment, the deformable part may include a first deformable part formed on the lower elastic member; And a second deformation portion formed on the upper elastic member. At this time, the configurations of the first and second deformation portions are the same as those of the first and second embodiments described above.

The lower elastic member is divided into two, and terminals to which power having different polarities are applied may be integrally formed.

The bobbin includes a lens barrel having at least one lens; And a coil unit coupled to an outer circumferential surface thereof, wherein the coil unit is installed inside the housing, and may be installed at a position corresponding to a magnet of a holder member having a plurality of magnets.

Even if the sizes of the bobbin and the housing are different from each other, since the deformation portion is formed in the upper or lower elastic member to form an offset, it is possible to prevent the occurrence of a gap or lift in the connecting portion of the elastic member. In addition, it is possible to reduce the malfunction due to the inflow of foreign matter, and thus improve the reliability of the camera module.

1 is an exploded perspective view of a camera module according to the present embodiment,
2 and 3 are views schematically showing a coupling relationship between a bobbin and a housing of a camera module according to a first embodiment;
4 is a diagram schematically showing a coupling relationship between a bobbin and a housing of a camera module according to a second embodiment;
5 and 6 are views schematically showing a coupling relationship between a bobbin and a housing of a camera module according to a third embodiment, and
7 is a view schematically showing a coupling relationship between a bobbin and a housing of a camera module according to a fourth embodiment.

Hereinafter, an embodiment of the present embodiment will be described with reference to the accompanying drawings.

1 is an exploded perspective view of a camera module according to the present embodiment, FIGS. 2 and 3 schematically show a coupling relationship between a bobbin and a housing of a camera module according to a first embodiment, and FIG. 4 is a second embodiment. Figures 5 and 6 schematically show the coupling relationship between the bobbin and the housing of the camera module according to the third embodiment, and Figure 7 is It is a diagram schematically showing the coupling relationship between the bobbin and the housing of the camera module according to the fourth embodiment.

As shown in FIG. 1, the camera module according to the present embodiment includes a printed circuit board 10, a base 20, a lens 45, and a housing 50. Here, the first and second holder members 30a and 30b, and a shield can (not shown) may be further included. A stepped reinforcement part 100 may be formed on the base 20.

The printed circuit board 10 has an image sensor 11 mounted on an upper surface thereof, and may form a bottom surface of the camera module.

The base 20 may have an infrared cut filter (not shown) installed at a position corresponding to the image sensor 11, and may support the housing 50 at an upper side. The base 20 may be injection molded of a resin material. In addition, the base 20 may function as a sensor holder as there is a pillar portion protruding downward from the side of the base 20 to protect the image sensor 11 on the lower side, and a separate lower part of the base 20 The sensor holder of may be arranged.

The holder member 30 may be composed of first and/or second holder members 30a and 30b. The first and/or second holder members 30a and 30b may have a substantially rectangular shape, and magnet mounting holes through which a plurality of magnets 31 may be installed may be formed on each of four surfaces. At this time, the magnets 31 may be formed to have sizes corresponding to each other, and the magnets 31 facing each other are parallel to each other, and the upper surface of the first holder member 30a and/or the second holder member 30a, 30b Can be placed on the underside of. Alternatively, the first and second holder members 30a and 30b may be formed integrally without being separated, and magnet mounting holes or mounting grooves may be formed on the side surfaces thereof to arrange magnets.

In addition, the magnets 31 may be fixed to the side surface of the housing 50, and in this case, the housing 50 may function as a yoke made of a metal material. In addition, the magnets 31 may function as a yoke or may be disposed at four corners of the metal housing 50.

The first and/or second holder members 30a and 30b are formed in a hexahedral shape as shown in FIG. 1, but may be provided in a frame shape having a thin slope. A lower elastic member 41 to be described later is installed on the upper surface of the first holder member 30a to support the reciprocating movement of the bobbin 40 in the optical axis direction. An upper elastic member 42 to be described later may be disposed on an upper surface or a lower surface of the second holder member 30b.

According to this embodiment, the bottom surface of the first holder member 30a may be coupled to the base 20. The upper surface of the second holder member 30b may be coupled to the housing 50 or the upper elastic member 42. In this case, the upper elastic member 42 may be interposed between the second holder member 30b and the housing 50 or disposed under the holder member 30, and the lower elastic member 41 It may be interposed between the first holder member (30a) and the base (20). That is, the first holder member 30a presses the lower elastic member 41 so that the rim of the lower elastic member 41 may come into close contact with the base 20. At this time, the rim may be additionally fixed to the base 20 with a separate adhesive member. In addition, the second holder member 30b may press the upper elastic member 42 to come into close contact with the housing 50. At this time, the rim may be additionally fixed to the housing 50 with a separate adhesive member.

Meanwhile, the lower elastic member 41 may have a structure divided into two as shown in FIG. 1. That is, by dividing the lower elastic member 41 into two, each of which receives power having a different polarity may be applied to the coil unit 43 disposed on the outer circumferential surface of the bobbin 40. In this case, the divided lower elastic members 41 may be provided in a symmetrical shape. However, the present invention is not limited thereto, and the upper elastic member 42 may be divided into two parts.

The bobbin 40 may be installed in the inner space of the housing 50 to reciprocate in the optical axis direction. The bobbin 40 may have a coil unit 43 installed on an outer circumferential surface of the bobbin 40 to enable electromagnetic interaction with the magnet 31.

The bobbin 40 may include a lens barrel 44 in which at least one lens 45 is installed. The lens barrel 44 may be formed to be screwed into the bobbin 40 as shown in FIG. 1. However, this is not limited, and although not shown, the lens barrel 44 may be directly fixed to the inside of the bobbin 40 by a method other than screwing, or the one or more lenses 45 may be attached without the lens barrel 44. It is also possible to be formed integrally with the bobbin. The lens 45 may be configured as one sheet, or two or more lenses may be configured to form an optical system.

The lower portion of the bobbin 40 is connected to the lower elastic member 41, and the upper portion is connected to the upper elastic member 42, thereby supporting reciprocating movement in the optical axis direction. That is, the lower and upper elastic members 41 and 42 have one end connected to the base 20 and/or the housing 50, and the other end connected to the upper and lower surfaces of the bobbin 40. According to this configuration, when the bobbin 40 reciprocates with respect to the optical axis direction, the lower and upper elastic members 41 and 42 are centered on the fixed position of the base 20 and/or the housing 50. While performing the vertical movement, it is possible to support the bobbin 40.

On the other hand, the coil unit 43 may be provided as a ring-shaped coil block inserted and coupled to the outer peripheral surface of the bobbin 40, but is not limited thereto, and the coil may be wound directly on the outer peripheral surface of the bobbin 40. . In addition, the shape of the coil unit 43 may be provided in a rectangular shape, such as a square shape, a hexagon shape, an octagon shape. The magnet surface facing the coil unit 43 may be the same as a radius of curvature of the coil. If the coil unit is a flat surface, the magnet surface may be a flat surface, and if the coil unit is a curved surface, the magnet surface may also have a curved surface. This is to maximize the electromagnetic force or magnetic flux acting between the magnet and the coil unit.

The housing 50 may function as a yoke, and at this time, it may be formed of a metal material. In this case, the housing 50 may concentrate the magnetic flux of the magnet 31. Alternatively, the housing 50 may have a plurality of yokes installed therein, or may be formed of a resin material by insert injection integrally with the yoke.

The embodiment may further include a separate shield can (not shown). The shield can may be formed of a ferromagnetic material such as iron, and may be provided in a shape corresponding to the housing 50 so as to wrap all of the housing 50. That is, if the housing 50 is square, the shield can may also be provided in a square shape. In this case, four corners of the shield can may be provided in a rounded shape. Of course, it is also possible to form an angled corner, but since the shield can is formed by bending a plate or bent through press processing, a round portion is generally formed at each corner.

Meanwhile, when the first and second holder members 30a and 30b and the bobbin 40 have different heights, or the upper/lower elastic members 42 and 41 of the housing 50 are fixed. When the position height and the height of the bobbin 40 are different from each other, the upper and/or lower elastic members 42 and 41 and the housing 50 or the holder member 30 and the upper and/or lower elastic members 42 ) (41) and the base 20 may be formed with a gap (gap) at each of the coupling position. In order to reduce such a gap, the upper and/or lower elastic members 42 and 41 may be assembled to have an offset so that the connection positions of both ends have different heights through deformation such as position and shape. .

That is, the shape of the lower and upper elastic members 41 and 42 is when assembling the ends to the base 20 and the housing 50 or the holder member 30, the bobbin 40 and the housing 50 or the holder member ( It is to assemble by changing the offset height according to the height difference of 30).

This embodiment is described based on a position fixed to the upper/lower elastic members 42 and 41 on the housing 50, but is not limited thereto, and the fixed position may be the holder member 30 or the like.

According to the first embodiment, as shown in Figs. 2 and 3, when the bobbin 40 has a higher height than the housing 50, the upper surface of the bobbin 40 and the housing 50 is maintained horizontally. Can be assembled to do. Then, the upper elastic member 42 may be installed horizontally as shown.

On the other hand, in the case of the lower elastic member 41, one end is coupled to the bobbin 40 and the other end must be connected to the housing 50 and the base 20, respectively. As shown in FIG. 2, the bottom surface and the lower portion of the housing 50 The ends of the elastic members 41 are bound to be spaced apart. In this case, as shown in FIG. 3, by forming the first deformable portion 100 on the side of the lower elastic member 41, the end of the lower elastic member 41 is spaced between the base 20 and the housing 50, respectively. Can be combined so as not to form.

The first deformable part 100 may include a first inflection part 110 and a second inflection part 120. The first inflection part 110 is disposed at a position close to the bobbin 40 to form the lower elastic member 41 to be inclined upward, and the second inflection part 120 is disposed in a position close to the housing 50 to The inclination angle of the elastic member 41 is changed in the horizontal direction. According to this configuration, the lower elastic member 41 can be fixed through the coupling of the base 20 and the housing 50, thereby minimizing a gap between the connection portion of the housing 50 and the base 20. In addition, the connection part may be sealed using an epoxy or tape member to prevent external foreign matter, etc., but it is not necessary. That is, the base 20 and the housing 50 may be coupled to each other in a complementary shape, and the inflow of foreign matters may be blocked through fitting of the base 20 and the housing 50.

4 shows a case in which the bottom surface of the bobbin 40 and the bottom surface of the housing 50 are horizontally aligned and arranged according to the second embodiment, contrary to the first embodiment. In this case, the lower elastic member 41 may have an end horizontally connected to the housing 50 as shown. On the other hand, the upper elastic member 42 may form a second deformable part 200 so that the end of the upper elastic member 42 is assembled without a gap on the side of the housing 50.

The second deformable part 200 may include a third inflection part 210 and a fourth inflection part 220. The third inflection part 210 is disposed at a position close to the bobbin 40 to form the upper elastic member 42 to be inclined downward, and the fourth inflection part 220 is disposed in a position close to the housing 50 to The inclination angle of the elastic member 42 is changed in the horizontal direction. According to this configuration, the upper elastic member 42 can be fixed through the coupling of the base 20 and the housing 50, thereby minimizing a gap between the connecting portion of the housing 50 and the base 20. In addition, the connection part may be sealed using an epoxy or tape member to prevent external foreign matter, etc., but it is not necessary. That is, the base 20 and the housing 50 may be coupled to each other in a complementary shape, and the inflow of foreign matters may be blocked through fitting of the base 20 and the housing 50.

Fig. 5 is according to the third embodiment, reflecting the configurations of both the first and second embodiments described above at once. In this case, the bobbin 40 is formed larger than the housing 50, and may be disposed to protrude to both the upper and lower sides of the housing 50. In this case, both of the lower and upper elastic members 41 and 42 may include first and second changing portions 100 and 200 whose inclination angles are changed.

That is, the first deformable part 100 may include a first inflection part 110 and a second inflection part 120. The first inflection part 110 is disposed at a position close to the bobbin 40 to form the lower elastic member 41 to be inclined upward, and the second inflection part 120 is disposed in a position close to the housing 50 to The inclination angle of the elastic member 41 is changed in the horizontal direction. According to this configuration, the lower elastic member 41 can be fixed through the coupling of the base 20 and the housing 50, thereby minimizing a gap between the connection portion of the housing 50 and the base 20.

The second deformable part 200 may include a third inflection part 210 and a fourth inflection part 220. The third inflection part 210 is disposed at a position close to the bobbin 40 to form the upper elastic member 42 to be inclined downward, and the fourth inflection part 220 is disposed in a position close to the housing 50 to The inclination angle of the elastic member 42 is changed in the horizontal direction. According to this configuration, the upper elastic member 42 can be fixed through the coupling of the base 20 and the housing 50, thereby minimizing a gap between the connecting portion of the housing 50 and the base 20.

In addition, the connection portions of the lower and upper elastic members 41 and 42 may be sealed using epoxy or a tape member to prevent external foreign matter, but it is not necessary. That is, the base 20 and the housing 50 may be coupled to each other in a complementary shape, and the inflow of foreign matters may be blocked through fitting of the base 20 and the housing 50.

6 is a view schematically showing a state in which the lower and upper elastic members 41 and 42 are coupled to the bobbin body 40 side, not the upper and lower ends of the bobbin 40, according to the third embodiment. When the first and second deformation portions 100 and 200 are formed in both the lower and upper elastic members 41 and 42 as described above, the step difference according to the size difference between the housing 50 and the base 20 is reduced to the lower and upper portions. Since both ends can be fixed by forming an inclined surface formed through deformation of the elastic members 41 and 42, the camera module can be assembled without a gap. According to such a configuration, side effects such as the elastic deformation of the lower and upper elastic members 41 and 42 is disturbed or the spring constant is distorted due to the first and second deformation parts 100 and 200 described above. Can be minimized, more accurate actuator control may be possible.

In addition, in the above embodiment, although the length of the bobbin is longer than the length of the housing, as shown in FIG. The shape of (42) (41) can be reversed. That is, when viewed as a whole, the upper/lower elastic members 42 and 41 may have an X-shaped shape.

Although the embodiments according to the present embodiment have been described above, these are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent ranges of embodiments are possible therefrom. Therefore, the true technical protection scope of this embodiment should be determined by the following claims.

10; Printed circuit board 11; Image sensor
20; Bases 30a, 30b; First and second holder members
31; Magnet 40; Bobbin
41; Lower elastic member 42; Upper elastic member
43; Coil unit 44; Lens module
45; Lens 50; housing
100; A first deformation part 200; Second variant

Claims (13)

housing;
A bobbin disposed in the housing;
A coil disposed on the bobbin;
A magnet disposed between the housing and the coil and facing the coil;
A base disposed under the bobbin; And
It includes a lower elastic member disposed on the lower surface of the bobbin,
The lower elastic member includes a first part disposed on the lower surface of the bobbin, a second part disposed between the base and the bottom surface of the housing, and a third part connecting the first part and the second part Including,
The camera module wherein the third portion of the lower elastic member is disposed at a position higher than the first portion of the lower elastic member in an initial state in which power is not applied to the coil. The method of claim 1,
A camera module in which a length in the optical axis direction between the first portion of the lower elastic member and the third portion of the lower elastic member is equal to a length in the optical axis direction between the lower surface of the bobbin and the bottom surface of the housing . The method of claim 1,
A camera module having a first length of the bobbin in the optical axis direction is longer than a second length of the housing in the optical axis direction. The method of claim 1,
The camera module wherein the first portion of the lower elastic member and the third portion of the lower elastic member are parallel to a direction perpendicular to an optical axis direction. The method of claim 1,
The camera module wherein the second portion of the lower elastic member is obliquely disposed toward the third portion of the lower elastic member from the first portion of the lower elastic member. The method of claim 1,
It includes an upper elastic member disposed between the upper surface of the bobbin,
The upper elastic member includes a fourth part disposed on the upper surface of the bobbin, a fifth part disposed on the upper surface of the housing, and a sixth part connecting the fourth part and the fifth part,
A camera module wherein the fourth to sixth portions of the upper elastic member are disposed on the same plane. The method of claim 1,
It includes an upper elastic member disposed between the upper surface of the bobbin,
The upper elastic member includes a fourth part disposed on the upper surface of the bobbin, a fifth part disposed on the upper surface of the housing, and a sixth part connecting the fourth part and the fifth part,
In an initial state in which power is not applied to the coil, the fourth portion of the upper elastic member is disposed at a position higher than the sixth portion of the upper elastic member. The method of claim 7,
A camera module wherein the fifth portion of the upper elastic member is obliquely disposed from the fourth portion of the upper elastic member toward the fifth portion of the upper elastic member. The method of claim 7,
The length in the optical axis direction between the fourth portion of the upper elastic member and the sixth portion of the upper elastic member is the same as the length in the optical axis direction between the upper surface of the bobbin and the upper surface of the housing module. The method of claim 1,
A gap is formed between the bottom surface of the housing and the base,
The camera module wherein the third portion of the lower elastic member is disposed in the gap. The method of claim 1,
A camera module in which an adhesive member is disposed between the base and the third portion of the lower elastic member. The method of claim 1,
A camera module in which the height of the bobbin in the optical axis direction is different from the height of the housing in the optical axis direction. A portable terminal device comprising the camera module of claim 1.

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