CN217385944U

CN217385944U - Lens driving device, camera device and mobile terminal

Info

Publication number: CN217385944U
Application number: CN202221414668.7U
Authority: CN
Inventors: 龚高峰; 王建华; 姜星海
Original assignee: Shanghai BL Electronics Co Ltd
Current assignee: Shanghai BL Electronics Co Ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-09-06
Anticipated expiration: 2032-06-08

Abstract

The utility model discloses a lens driving device, a camera device and a mobile terminal, wherein the lens driving device comprises a base and an anti-shake mechanism arranged on the base; the anti-shake mechanism comprises a frame, a lens carrier and an anti-shake driving unit; the lens carrier sets up the carrier holding intracavity of frame is provided with 2 degrees of freedom sliding support structures and prevents the anti-disengaging structure that lens carrier and frame break away from between lens carrier and the frame. The lens driving device of the utility model is provided with a 2-freedom degree sliding support structure and an anti-drop structure for preventing the lens carrier from being separated from the frame; the anti-shake mechanism is suspended and connected without adopting a suspension wire structure; compared with a suspension wire type connecting structure, the suspension wire type connecting structure is more durable, and the manufacturing difficulty is reduced; the reliability of the product is improved.

Description

Lens driving device, camera device and mobile terminal

Technical Field

The utility model relates to a camera equipment technical field, concretely relates to a miniature camera and the cell-phone of installing above-mentioned camera, notebook or other camera device that has camera module that is used for miniature camera's lens drive arrangement and uses this lens drive arrangement.

Background

With the increasing demands for high accuracy and high magnification of cameras, there is an increasing demand for a correction function of an optical anti-shake (OIS) function for correcting camera shake, vibration, and the like in electronic devices such as smartphones. The anti-shake driving device provided by the prior art mostly adopts a suspension wire type structure, the suspension wire type structure is complex, the manufacturing difficulty is very high, the requirements on installation precision and positioning precision are high, and the anti-shake driving device is easy to damage.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lens driving device which has novel and unique structure and convenient use and can completely avoid adopting a suspension wire type structure; the specific technical scheme is as follows:

a lens driving device comprises a base and an anti-shake mechanism arranged on the base; the anti-shake mechanism comprises a frame, a lens carrier and an anti-shake driving unit; the lens carrier is arranged in the carrier accommodating cavity of the frame, and a 2-freedom-degree sliding supporting structure is arranged between the lens carrier and the frame.

Furthermore, the horizontal sliding support structure adopts a ball sliding support structure to combine with an anti-disengaging structure for preventing the separation of the lens carrier and the frame, a plurality of supporting balls are arranged between the lens carrier and the frame, a frame sliding groove is arranged at the bottom of the accommodating cavity, a carrier sliding groove is arranged at the bottom of the carrier, and the frame sliding groove and the carrier sliding groove form a cross sliding groove in space for accommodating each supporting ball.

Further, the device also comprises a focusing mechanism, wherein the focusing mechanism comprises a focusing driving unit and a vertical sliding supporting structure.

Further, the vertical sliding support structure comprises an anti-disengaging structure for preventing the base from being disengaged from the frame, and a plurality of vertical sliding balls, ball accommodating grooves and vertical sliding grooves matched with the vertical sliding balls; the sliding grooves are at least two.

Furthermore, the base and the frame are rectangular frames, and the number of the sliding grooves is two, and the two sliding grooves are respectively arranged at two adjacent corners of the rectangular frames.

Further, the anti-falling structure is composed of a magnet and a magnet attracting body of the driving unit.

Furthermore, the coils of the anti-shake driving unit and the focusing driving unit are fixedly connected with the base through a PCB.

Further, the PCB is an FPC board.

The utility model also discloses a camera device adopts foretell lens drive arrangement.

The utility model also discloses a mobile terminal adopts foretell camera device.

The lens driving device of the utility model is provided with a 2-freedom degree sliding support structure and an anti-drop structure for preventing the lens carrier from being separated from the frame; the anti-shake mechanism is suspended and connected without adopting a suspension wire structure; compared with a suspension wire type connecting structure, the suspension wire type connecting structure is more durable, and the manufacturing difficulty is reduced; the reliability of the product is improved.

Drawings

FIG. 1 is a schematic view of the internal structure of a lens driving device according to the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is an exploded view of a lens driving device according to the present invention;

FIG. 4 is a partial structural diagram of a driving unit;

FIG. 5 is a schematic diagram of an anti-shake driving structure;

FIG. 6 is a schematic exploded view of the anti-shake unit 1;

FIG. 7 is a schematic view of an exploded structure of an anti-shake unit 2;

FIG. 8 is a schematic view of the structure of the upper cover;

FIG. 9 is a schematic view of an upper cover mounting structure;

fig. 10 is a schematic structural diagram of the zoom driving unit.

In the figure: 1. a housing; 2. an upper cover plate; 21. impacting the boss; 3. a lens carrier; 31. a magnetic column; 32. a horizontal ball upper chute; 4. a frame; 41. vertical balls; 42. a horizontal ball bearing; 43. a horizontal ball lower chute; 44. a guide head; 5. an FPC board; 6. a base; 61. magnetic suction sheets; 7. a first drive unit; 71. a first drive unit coil; 72. a first drive unit magnet; 73. a first drive unit magnetic attraction sheet; 74. a first drive unit hall element; 8. a second driving unit; 81. a second drive unit coil; 82. a second drive unit magnet; 83. a second drive unit magnetic attraction sheet; 84. a second drive unit Hall element; 9. a third driving unit; 91. a third drive unit coil; 92. a third drive unit magnet; 93. And a third driving unit Hall element.

Detailed Description

The present invention will be more fully described with reference to the following examples. The present invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.

For ease of description, spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 3, the lens driving apparatus in the present embodiment includes a base 6 and an anti-shake mechanism disposed on the base 6. Wherein the anti-shake mechanism comprises a frame 4, a lens carrier 3 and an anti-shake drive unit. A lens (not shown in the figure) is fixedly arranged on the lens carrier 3.

The lens carrier 3 is arranged in a carrier accommodating cavity of the frame 4, and a 2-degree-of-freedom (for example, two directions of an X-axis and a Y-axis) sliding support structure is arranged between the lens carrier 3 and the frame 4. The anti-shake driving unit can drive the lens carrier 3 to move in the accommodating cavity in an orthogonal 2-degree-of-freedom mode, and the influence of shake is eliminated. Of course, there should be enough clearance between the outer edge of the lens carrier 3 and the inner wall of the lens receiving cavity to ensure that the lens carrier 3 has enough moving space for the anti-shake function.

As shown in fig. 4, the lens driving device is provided with a first driving unit 7 that drives the lens to move in the X-axis direction; a second driving unit 8 that drives the lens to move in the Y-axis direction; and a third driving unit 9 driving the lens to move in the Z-axis direction.

Wherein the first drive unit 7 comprises a first drive unit coil 71, a first drive unit magnet 72, a first drive unit hall element 74; the second drive unit 8 includes a second drive unit coil 81, a second drive unit magnet 82, a second drive unit hall element 84; the third drive unit 9 includes a third drive unit coil 91, a third drive unit magnet 92, and a third drive unit hall element 93.

One driving coil for each direction in the anti-shake unit may be used; the anti-shake coils are only arranged on one side and are not symmetrically arranged any more; a larger driving force can be obtained by adopting a plurality of driving coils; the suction force of the shell to the driving magnet is more favorably counteracted.

The 2-degree-of-freedom sliding support structure can be realized in a mode that two groups of orthogonal sliding blocks and sliding rails or sliding blocks and sliding grooves are combined. For example: one group of sliding rails or sliding chutes extend along the X-axis direction and are fixed on the bottom end surface of the lens carrier 3; the other group of sliding rails or sliding chutes extend along the Y-axis direction and are fixed on the bottom surface of the accommodating cavity; the two groups of mechanisms are connected through a common sliding block. Other modes in the prior art can also be adopted to realize the 2-freedom sliding support structure in the anti-shake direction.

As shown in fig. 5 to 7, the 2-degree-of-freedom sliding support structure can be realized by combining a ball sliding support structure and a release prevention structure for preventing the lens carrier 3 from being released from the frame 4, and the structure is simpler. The concrete structure is as follows: at least 3 horizontal balls 42 are arranged between the lens carrier 3 and the frame 4, a horizontal ball lower sliding groove 43 is arranged at the bottom of the accommodating cavity and serves as a frame sliding groove, a horizontal ball upper sliding groove 32 is arranged at the bottom of the carrier and serves as a carrier sliding groove, the frame sliding groove is orthogonal to the carrier sliding grooves, and a cross sliding groove for accommodating each supporting ball is formed in space. The horizontal balls 42 can slide along the frame runner and also can slide along the carrier runner; the lens carrier 3 and the frame 4 slide by a horizontal ball 42 to realize relative movement of an X axis and a Y axis.

When the lens driving device is in a non-upright state or in a violent shock, the lens carrier 3 and the frame 4 may be separated, so that the ball sliding support structure cannot work normally; therefore, the ball sliding support structure is also provided with an anti-disengaging structure that prevents the lens carrier 3 from disengaging from the frame 4; the lens carrier 3 is connected with the frame 4 in a floating way by utilizing the attraction force generated by the magnet and the magnet attracting body or the attraction force generated by the opposite magnetic pole by matching with the gap between the bottom surface of the lens carrier 3 and the bottom surface of the accommodating cavity of the horizontal ball 42. Or on the opposite side with the repulsion force generated by the same pole to achieve a floating connection of the lens carrier 3 with the frame 4.

For example: a magnetic column 31 is fixedly arranged at the bottom of the lens carrier 3; the bottom of the accommodating cavity of the frame 4 is provided with a magnetic suction sheet 61; the lens carrier 3 is floatingly coupled to the frame 4 by the attractive force between the magnetic pole 31 and the magnetic attraction sheet 61.

In order to equalize the magnetic attraction, at least 3 sets of magnets and attracting magnets should be provided; the 3 groups of structures are preferably distributed uniformly on the bottom surface of the carrier. A magnet of the drive unit may also be utilized; a first drive unit magnetism attracting sheet 73 is provided on the frame 4 below the first drive unit magnet; a second drive unit magnet attracting sheet 83 is provided on the frame 4 below the second drive unit magnet.

The 2-freedom-degree sliding support structure is different from a suspension wire type structure, and an elastic suspension wire is not needed, so that the problems of complex structure, great manufacturing difficulty, high requirements on installation precision and positioning precision, easiness in damage and the like caused by the suspension wire type structure are solved.

A focusing mechanism can be added to the lens driving device to realize an automatic focusing function. The focusing mechanism includes a third driving unit 9 as a focusing driving unit, a vertical sliding support structure. The vertical sliding support structure can adopt the matching of a sliding block and a sliding rail, and the sliding block or the sliding groove is matched to realize two functions of sliding and supporting. The sliding mechanism that the ball rolls in the chute can also be adopted to realize the two functions of longitudinal sliding and supporting; the number of the ball chute structures is related to the cross section shape of the moving part, and at least 3 groups of circular sections are needed; the rectangular cross section has four surfaces which need ball chute structures, wherein, two surfaces have at least two groups of ball chute structures; at least one set of ball groove structures on the other two surfaces, namely at least 6 sets, is needed to ensure smooth zooming movement of the lens carrier 3.

A gap is required to be reserved between the movable part and the static part of the vertical sliding support structure so as to avoid influencing sliding motion; in order to avoid the influence of the clearance on the regulation and control of the anti-shake mechanism; the vertical sliding support structure is also provided with an anti-drop structure for preventing the base 6 from being separated from the frame 4. Through the anti-falling structure, when the frame 4 moves up and down, one side of the frame is always clung to the base 6; thus, the ball ramp structures may be provided in only two sets.

The ball sliding groove structure includes vertical balls 41, a ball accommodating groove, and a sliding groove in a vertical direction that is matched with the vertical sliding balls. The ball receiving groove has guide heads 44 at both ends; the guide head 41 cooperates with the guide groove, since the position of the guide head 41 is fixed relative to the lens carrier 3; and the interference of anti-shake motion is reduced.

The slider can be fixed to the corner of the frame 4; a through groove in the vertical direction is arranged on the side wall of the base and serves as a sliding groove; the ball accommodating groove is arranged on the outer side of the sliding block; thus, the processing is more convenient.

As shown in fig. 10, the base and the frame are both rectangular frames, and two sliding grooves are respectively disposed at two adjacent corners of the rectangular frames.

The anti-falling structure of the zooming mechanism is also composed of a magnet and a magnet attracting body. The third driving unit magnet may be used as the magnet of the escape prevention structure; a shell made of a magnetic absorption material stainless steel is used as a magnetic absorption body; the adsorption side of the lens carrier 3 realizes the axial sliding motion of the Z axis through two groups of ball chute structures.

Fixedly mounting a magnet of a driving unit on a movable piece, wherein driving coils of the anti-shake driving unit and the focusing driving unit are fixedly connected with the base through a PCB; the drive coil is no longer movable relative to the base and the connection is more secure.

The PCB can adopt an FPC board 5; the space is saved.

As shown in fig. 8 and 9, an upper cover plate 2 is provided above the frame 4, and the upper cover plate 2 is adhered to the frame 4; impact bosses 21 are arranged at the corners of the upper cover plate 2; the impact boss 21 is made of a softer material such as rubber, and can play a role in buffering and avoid direct impact between the frame 4 and the shell 1. The impact boss 21 may be made of TPU (Thermoplastic polyurethane elastomer rubber) for facilitating Thermoplastic molding. Similarly, the corner of the bottom upper surface of the base 6 is also provided with a striking boss 21 which can serve as a cushion. The bump bosses 21 are also advantageous in limiting the distance between the upper and lower ends of the lens carrier 3 and the upper and lower ends of the frame 4, and preventing the horizontal balls 42 from falling off from the slide grooves during bumping.

When the system is used, the system drives the first driving unit magnet 72 to drive the lens carrier 3 to move along the X axis by controlling the current of the first driving unit coil 71, and the first driving unit Hall element 74 is used for feeding back the X axis displacement of the lens carrier 3; the current of the second driving unit coil 81 drives the second driving unit magnet 82 to drive the lens carrier 3 to move along the Y-axis, and the second driving unit hall element 84 is used for feeding back the Y-axis displacement of the lens carrier 3. The 4 horizontal balls 42 are used for supporting the lens carrier 3 and are matched with the horizontal ball upper sliding groove 32 and the horizontal ball lower sliding groove 43, so that the lens carrier 3 is enabled to move in the accommodating cavity in XY2 degrees of freedom.

The first drive unit magnet 72 fixed on the side wall of the lens carrier 3 and the first drive unit magnet-attracting piece 73 fixed on the bottom of the frame 4 are attracted; the second drive unit magnet 82 fixed on the side wall of the lens carrier 3 and the second drive unit magnet-attracting piece 83 fixed on the bottom of the frame 4 are attracted; the magnetic column 31 fixed at the bottom of the lens carrier 3 and the magnetic-attracting sheet 61 fixed at the bottom of the frame 4 are attracted; prevent the bottom end face of the lens carrier 3 from disengaging from the bottom surface of the accommodating cavity together; the lens carrier 3 and the frame 4 can only move in an anti-shake plane; the relative fixing is achieved by the attraction force of the magnet and the support of the horizontal ball 42 in the zooming direction being balanced.

The system drives the third driving unit magnet 92 to drive the frame 4 to move along the Z-axis by controlling the current of the third driving unit coil 91, and the third driving unit hall element 93 is used for feeding back the Z-axis displacement of the frame 4. Because the lens carrier 3 and the frame 4 are relatively fixed in the Z-axis direction, the lens can be driven to move along the Z-axis, and zooming is realized. Attraction force generated between the third driving unit magnet 92 and the housing 1 is balanced with supporting force generated by the vertical balls 41 at two corners of the frame body 4, so that the frame body 4 is tightly attached to one side of the base provided with the third driving unit magnet 92, and the interference generated by the anti-shake motion of the lens carrier 3 in the X-axis direction can be avoided; the cooperation of the sliding groove and the sliding block can avoid the interference generated by the anti-shake motion of the lens carrier 3 in the Y-axis direction.

By adopting the scheme in the embodiment, the anti-shake mechanism adopts a sliding support structure with 2 degrees of freedom; the anti-drop structure is matched, so that the anti-shaking mechanism can slide along two degrees of freedom of the XY axis, and the suspension structure is not adopted to connect the lens carrier 3 and the frame 4. The zoom mechanism may also adopt a vertical sliding mechanism to cooperate with the anti-falling structure, so that the frame 4 and the lens carrier 3 move together in the Z-axis direction, and the suspension structure is not also adopted to connect the base 6 and the frame 4. The application of the suspension wire type structure is reduced, and the problems that the suspension wire type structure is complex, the manufacturing difficulty is very high, the requirements on installation precision and positioning precision are high, and the suspension wire type structure is easy to damage are solved.

The lens driving device in this embodiment can be used for a miniature camera device, a camera, a video camera, and other imaging devices; the micro camera device can also be used for mobile terminals such as mobile phones and notebook computers.

The above examples are only for illustrating the present invention, and besides, there are many different embodiments, which can be conceived by those skilled in the art after understanding the idea of the present invention, and therefore, they are not listed here.

Claims

1. A lens driving device comprises a base and an anti-shake mechanism arranged on the base; the anti-shake mechanism comprises a frame, a lens carrier and an anti-shake driving unit; the lens carrier is arranged in the carrier accommodating cavity of the frame, and is characterized in that a 2-freedom-degree sliding supporting structure is arranged between the lens carrier and the frame.

2. The lens driving device as claimed in claim 1, wherein the 2-degree-of-freedom sliding support structure is a ball sliding support structure, a plurality of support balls are disposed between the lens carrier and the frame, a frame sliding groove is disposed at a bottom of the accommodating chamber, a carrier sliding groove is disposed at a bottom of the carrier, and the frame sliding groove and the carrier sliding groove form a cross sliding groove in space for accommodating each support ball; the 2-degree-of-freedom sliding support structure is further provided with an anti-disengaging structure for preventing the lens carrier from disengaging from the frame.

3. The lens driving apparatus as claimed in claim 2, further comprising a focus mechanism including a focus driving unit, a vertical sliding support structure.

4. The lens driving device according to claim 3, wherein the vertical sliding support structure comprises a plurality of vertical sliding balls, a ball receiving groove, and a vertical sliding groove engaged with the vertical sliding balls; at least two sliding grooves are formed; the vertical sliding support structure is also provided with an anti-disengaging structure for preventing the base from disengaging from the frame.

5. The lens driving apparatus as claimed in claim 4, wherein said base and said frame are rectangular frames, and said sliding grooves are two and are respectively provided at two adjacent corners of said rectangular frames.

6. The lens driving device according to claim 3, wherein the retaining structure is composed of a magnet and a magnetic attraction piece of the driving unit.

7. The lens driving apparatus as claimed in claim 3, wherein the coils of the anti-shake driving unit and the focus driving unit are fixedly connected to the base through a PCB.

8. The lens driving apparatus as claimed in claim 7, wherein the PCB board is an FPC board.

9. An image pickup apparatus characterized by comprising the lens driving apparatus according to claim 1.

10. A mobile terminal characterized by comprising the camera device according to claim 9.