WO2024031759A1 - Lens drive device, photographing device and mobile terminal - Google Patents

Abstract

A lens drive device, a photographing device and a mobile terminal. The lens drive device comprises a base (7) and an image-stabilization mechanism arranged on the base (7), the image-stabilization mechanism comprising a lens carrier (2), an image-stabilization bracket (6) and an image-stabilization drive unit, and a 2-degree-of-freedom sliding support structure being arranged between the lens carrier (2) and the image-stabilization bracket (6). The lens drive device is provided with a two-degree-of-freedom sliding support structure and a separation-preventing structure for preventing the lens carrier (2) from being separated from the image-stabilization bracket (6), so that the image-stabilization mechanism does not use a suspension wire structure for suspension and connection, achieving higher durability and reduced manufacturing difficulty than suspension wire type connection structures, thereby improving reliability of products.

Description

A lens driving device, camera device and mobile terminal Technical field

The present invention relates to the technical field of imaging equipment, and in particular to a lens driving device for a micro camera, a micro camera using the lens driving device, and a mobile phone, notebook or other camera device with a camera module that installs the above camera.

Background technique

As the demand for high-precision and high-magnification cameras increases, there is an increasing demand for the correction performance of the optical image stabilization (OIS) function that corrects camera shake, vibration, etc. in electronic devices such as smartphones. The anti-shake driving devices provided by the existing technology mostly adopt a suspension-wire structure. The suspension-wire structure is complex, extremely difficult to manufacture, requires high installation accuracy and positioning accuracy, and is easily damaged.

Technical solutions

The purpose of the present invention is to provide a lens driving device that has a novel and unique structure, is easy to use, and can completely eliminate the use of a suspension structure; the specific technical solution is as follows.

A lens driving device includes a base and an anti-shake mechanism arranged on the base; the anti-shake mechanism includes a lens carrier, an anti-shake bracket and an anti-shake drive unit; between the lens carrier and the anti-shake bracket It is equipped with a 2-degree-of-freedom sliding support structure.

Further, the 2-degree-of-freedom horizontal sliding support structure adopts a ball sliding support structure, a number of support balls are provided between the lens carrier and the anti-shake bracket, and the bottom of the lens carrier is provided with a support ball to accommodate the support balls. Carrier chute; the 2-degree-of-freedom horizontal sliding support structure is also equipped with an anti-detachment structure that prevents the lens carrier from detaching from the anti-shake bracket.

Furthermore, it also includes a focusing mechanism, which includes a focusing drive unit and a vertical sliding support structure.

Further, the vertical sliding support structure includes a plurality of vertical sliding balls, ball receiving grooves and vertical sliding grooves that cooperate with the vertical sliding balls; there are at least two sliding grooves; the vertical sliding support structure It is also equipped with an anti-detachment structure that prevents the base from detaching from the anti-shake bracket.

Further, the base and the anti-shake bracket are both rectangular frames, and there are two sliding grooves, which are respectively provided at two adjacent corners of the rectangular frame.

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

Further, the coils of the anti-shake driving unit and the focusing driving unit are fixedly connected to the base through a PCB board.

Further, the PCB board is an FPC board.

The invention also discloses a camera device, which adopts the above-mentioned lens driving device.

The invention also discloses a mobile terminal, which adopts the above-mentioned camera device.

The lens driving device of the present invention is provided with a 2-degree-of-freedom sliding support structure and an anti-detachment structure that prevents the lens carrier from being separated from the anti-shake bracket; the anti-shake mechanism does not use a suspension structure for suspension connection; it is more durable than a suspension connection structure. And it reduces the difficulty of production and improves the reliability of the product.

Description of drawings

Figure 1 is a schematic structural diagram of the lens driving device of the present invention;

Figure 2 is a schematic diagram of the internal structure of the lens driving device of the present invention;

Figure 3 is an exploded schematic diagram of the structure of the lens driving device of the present invention;

Figure 4 is a schematic diagram 1 of the base structure;

Figure 5 is a schematic diagram 2 of the base structure;

Figure 6 shows the base reinforcement frame;

Figure 7 is a schematic structural diagram of the base assembly;

Figure 8 is a schematic diagram of the structure of the anti-shake bracket;

Figure 9 is a schematic structural diagram of the anti-shake component.

In the picture: 1. Housing; 2. Lens carrier; 201. Horizontal balls; 202. Upper anti-collision gasket; 203. Lens carrier reinforcement frame; 204. Horizontal ball groove; 3. Third drive unit; 4. First drive unit; 401. First drive unit magnetic shield; 402. Second drive unit magnet; 5. Second drive unit; 501. Second drive unit magnetic shield; 502. Second drive unit magnet; 6. Anti-shake bracket Frame; 601, rear guide column; 602, anti-falling magnet; 7, base; 701, lower anti-collision gasket; 703, front guide column; 704, vertical balls; 705, base reinforcement frame.

Embodiments of the invention

The present invention will be more fully described below using examples. This 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 explanation, spatially relative terms such as "upper", "lower", "left" and "right" may be used herein to describe the relationship of one element or feature to another element or feature 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" may encompass both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

As shown in FIGS. 1 to 3 , the lens driving device in this embodiment includes a base 7 and an anti-shake mechanism provided on the base 7 . The anti-shake mechanism includes an anti-shake bracket 6, a lens carrier 2 and an anti-shake drive unit. The lens (not shown in the figure) is fixedly arranged on the lens carrier 2 .

A sliding support structure with 2 degrees of freedom (for example, the X-axis and Y-axis directions) is provided between the lens carrier 2 and the anti-shake bracket 6 . The anti-shake driving unit can drive the lens carrier 2 to move orthogonally with two degrees of freedom on the anti-shake bracket 6 to eliminate the influence of shake. Of course, there should be enough clearance between the outer edge of the lens carrier 2 and the inner wall of the anti-shake bracket 6 to ensure that the lens carrier 2 has enough moving space for the anti-shake function.

The lens driving device is provided with a first driving unit 4 that drives the lens to move in the X-axis direction; a second driving unit 5 that drives the lens to move in the Y-axis direction; and a third driving unit 3 that drives the lens to move in the Z-axis direction.

The first drive unit 4 includes a first drive unit coil, a first drive unit magnet 402, and a first drive unit Hall element; the second drive unit 5 includes a second drive unit coil, a second drive unit magnet 502, a second drive unit magnet 502, and a second drive unit Hall element. Driving unit Hall element; the third driving unit 3 includes a third driving unit coil, a third driving unit magnet, and a third driving unit Hall element. In order to avoid mutual interference between the magnetic fields of the first driving unit 4 and the second driving unit 5, the first driving unit 4 is also provided with a first driving unit magnetic shielding plate 401; the second driving unit 5 is provided with a second driving unit magnetic shielding plate. 501; Isolate the magnetic fields of the two drive units. The magnetic baffle can be designed in a "匚" shape to facilitate the fixation of magnets, coils and motion limit protection.

One drive coil can be used in each direction in the anti-shake unit; since the anti-shake coil is only set on one side, it is no longer symmetrical; using multiple drive coils can obtain greater driving force; it is more conducive to counteracting the pair of shells. Drive the magnet's attraction.

As shown in Figures 4, 5 and 9, the 2-DOF sliding support structure can be realized by combining a ball sliding support structure with an anti-separation structure that prevents the lens carrier 2 from being separated from the anti-shake bracket 6, and the structure is simpler. The specific structure is: at least three horizontal balls 201 are provided between the lens carrier 2 and the anti-shake bracket 6. The bottom of the lens carrier 2 is provided with a horizontal ball groove 204 for accommodating the horizontal balls 201. The horizontal ball groove 204 is The diameter is larger than the diameter of the horizontal ball 201; the horizontal ball 201 can roll in the horizontal ball groove 204, supporting the lens carrier 2 and the anti-shake bracket 6 to achieve relative movement in the X-axis and Y-axis. Using a horizontal ball groove 204 that is larger than the diameter of the horizontal ball 201 has less resistance than using a fixed-point rolling ball seat. The diameter of the horizontal ball groove 204 should be slightly larger than the maximum offset in the X-axis and Y-axis directions, so that the horizontal ball 201 should try not to contact the side wall of the horizontal ball groove 204 during the rolling process.

When the lens driving device is not in an upright state, or is in severe vibration, the lens carrier 2 and the anti-shake bracket 6 may separate, causing the ball sliding support structure to fail to work normally; therefore, the ball sliding support structure is also provided with a preventive The anti-falling structure of the lens carrier 2 and the anti-shake bracket 6 is separated from each other; with the horizontal ball 201 in the gap between the bottom surface of the lens carrier 2 and the surface of the anti-shake bracket 6, the magnet fixed on the anti-shake bracket 6 and the anti-shake bracket 6 are used. The attractive force generated by the magnet at the bottom of the lens carrier 2 , or the attractive force generated by the opposite magnetic pole, connects the lens carrier 2 and the anti-shake bracket 6 in a floating manner. Or the repulsive force generated by the same magnetic pole is used on the opposite side to achieve a floating connection between the lens carrier 2 and the anti-shake bracket 6 .

For example: a magnet-absorbing piece is fixedly provided at the bottom of the lens carrier 2; an anti-detachment magnet 602 is provided on the anti-shake bracket 6; through the attraction force between the anti-detachment magnet 602 and the magnet-attracting piece, the lens carrier 2 and the anti-shake bracket 6 are Floating connection. The bottom edge of the "匚"-shaped magnetic baffle plate can be used as a magnetic absorbing piece.

In order to balance the magnetic attraction, at least 3 groups of magnets and magnet absorbers should be arranged; it is best to distribute the 3 groups of structures evenly on the bottom surface of the carrier.

The lens carrier 2 can also be embedded with a lens carrier reinforcing frame 203 to improve the strength of the lens carrier 2 . It can be made of metal with higher strength, such as stainless steel. The lens carrier reinforcing frame 203 is composed of two parts: a side wall and a bottom wall; wherein, the side wall is provided with a number of through holes to enhance the connection strength with the lens carrier 2; the lower end corner of the side wall is provided with a bottom at a position corresponding to the horizontal ball groove 204. wall; the bottom wall of the lens carrier reinforcement frame 203 can serve as the top wall of the horizontal ball groove 204.

As shown in Figure 6, the base 1 is embedded with a base reinforcement frame 705. The base reinforcement frame 705 is composed of two parts: a horizontal frame and a vertical frame; they correspond to the horizontal part and the vertical part of the base 1 respectively. The base reinforcement frame 705 is made of stainless steel. The outer edge of the horizontal frame extends out of the side wall of the base. After assembly, it can be welded to the bottom edge of the shell 1 to strengthen the connection strength between the shell and the base, improve the stability of the assembly connection and the reliability of the structure. sex, and conducive to miniaturization.

The 2-degree-of-freedom sliding support structure is different from the suspension wire structure in that it does not require elastic suspension wires. Therefore, it also avoids the structural complexity caused by the suspension wire structure, which is extremely difficult to make and requires high installation accuracy and positioning accuracy. And it is prone to damage and other problems.

As shown in FIGS. 7 and 8 , limiting corner walls are provided at the four corners of the anti-shake bracket 6 to limit the horizontal movement of the lens carrier 2 .

A focusing mechanism can also be added to the lens driving device to realize the automatic focusing function. The focusing mechanism includes a third driving unit 3 as a focusing driving unit and a vertical sliding support structure. The vertical sliding support structure can use the combination of slide blocks and slide rails, and the combination of slide blocks or chute to achieve the two functions of sliding and supporting. A sliding mechanism with balls rolling in the chute can also be used to achieve the two functions of longitudinal sliding and support; the number of ball chute structures is related to the cross-sectional shape of the movable parts, and at least 3 sets are required for circular cross-sections; for rectangular cross-sections, Then all four surfaces require ball chute structures, of which two surfaces have at least two sets of ball chute structures; the other two surfaces require at least one set of ball chute structures, that is, at least 6 groups are required to ensure the zoom movement of the lens carrier 2 Smooth.

There must be a gap between the movable parts and the stationary parts of the vertical sliding support structure to avoid affecting the sliding movement; in order to prevent the gap from affecting the regulation of the anti-shake mechanism, the vertical sliding support structure is also equipped with an anti-shake base 7 and an anti-shake bracket 6 Detachment prevention structure. Through the anti-separation structure, when the anti-shake bracket 6 moves up and down, one side is always close to the base 7; in this way, only two sets of ball chute structures can be provided; and the amount of shaking is smaller.

The base and the anti-shake bracket are both rectangular frames, and there are two sliding grooves, which are respectively provided at two adjacent corners of the rectangular frame.

A vertical wall is provided on one side of the base 1 for installing the coil, Hall element and circuit board of the third drive unit 3; front guide column receiving slots are provided at the left and right ends of the vertical wall, and the two front guide columns 703 are bonded together Or be fixed in the front guide column accommodating groove by welding. A through hole is provided at the bottom of the front guide column accommodating groove. The two front guide columns 703 and the through holes form a V-shaped groove for accommodating the vertical balls 704. Utilizing two cylindrical front guide posts 703 to form a V-shaped groove, not only the flatness is higher, but the angle formed by the two V-shaped grooves is consistent, the driving is smoother, and the guidance is better; the anti-shake bracket 6 is made longitudinally The slide is smoother, thereby improving the optical axis stability of the AF focus drive.

Similarly, the vertical wall of the anti-shake bracket 6 is also provided with a corresponding rear guide column accommodating groove. Two cylindrical rear guide columns 601 are placed in the rear guide column accommodating groove to form a V-shaped groove. The rear guide column accommodating groove is preferably provided at one end of the vertical wall of the anti-shake bracket 6, which can reduce the processing accuracy requirements of the anti-shake bracket 6 and make processing more convenient.

The front guide post 703 and the rear guide post 601 are both made of stainless steel. The V-shaped groove has better rigidity when the balls are impacted by external forces. It is best to provide a Teflon coating on the surface to further reduce the friction with the vertical balls 704.

The anti-detachment structure of the zoom mechanism is also composed of magnets and magnets. The magnet of the zoom drive unit and the magnet of the third drive unit can be used as the magnet of the anti-separation structure; the housing made of magnetic material stainless steel can be used as the magnet; it is best to set a magnetic plate on the installation side of the third drive unit of the base 1, corresponding to ground, fix the third drive unit magnet on the side wall of the anti-shake bracket 6. The adsorption side of the anti-shake bracket 6 realizes the sliding movement in the Z-axis direction through two sets of ball chute structures.

The magnet of the drive unit is fixedly installed on the movable part. The drive coils of the anti-shake drive unit and the focus drive unit are both fixedly connected to the base through the PCB board; the drive coil is no longer movable relative to the base, and the connection is more firm.

The PCB board can be an FPC board to save space.

An upper anti-collision gasket 202 is provided above the lens carrier 2. The upper anti-collision gasket 202 is pasted on the lens carrier 2 or the inner wall of the housing 1; the upper anti-collision gasket 202 is made of softer material such as rubber and can It plays a buffering role to avoid direct collision between the lens carrier 2 and the housing 1. The upper anti-collision gasket 202 can be made of TPU material (Thermoplastic polyurethanes thermoplastic polyurethane elastomer rubber), which is convenient for thermoplastic molding. Similarly, lower anti-collision pads 701 that can play a buffering role are also provided at the corners of the upper surface of the bottom of the base 7 . The lower anti-collision gasket 701 is also helpful in limiting the distance between the upper and lower ends of the lens carrier 2 and the housing 1, as well as the anti-shake bracket 6 and the base 1, to prevent the horizontal ball 201 from falling off the groove during impact.

When in use, the system drives the magnet of the first drive unit to drive the lens carrier 2 to move along the X-axis by controlling the current of the coil of the first drive unit. The Hall element of the first drive unit is used to feedback the X-axis displacement of the lens carrier 2; the second drive unit The current of the unit coil drives the second drive unit magnet to drive the lens carrier 2 to move along the Y-axis, and the second drive unit Hall element is used to feed back the Y-axis displacement of the lens carrier 2 . Three horizontal balls 201 are used to support the lens carrier 2 to ensure that the lens carrier 2 can move with two degrees of freedom in the XY axis in the accommodation cavity.

The bottom plate of the first drive unit magnetic shield 401 fixed on the side wall of the lens carrier 2 attracts the anti-detachment magnet 602 fixed on the bottom of the anti-shake bracket 6; the bottom plate of the second drive unit magnetic shield 501 fixed on the side wall of the lens carrier 2 It attracts the anti-detachment magnet 602 fixed at the bottom of the anti-shake bracket 6; together, it prevents the bottom end surface of the lens carrier 2 from being separated from the bottom surface of the accommodation cavity; so that the distance between the lens carrier 2 and the anti-shake bracket 6 can only be on the anti-shake plane. Movement; in the zoom direction, the attraction force of the magnet and the support of the horizontal ball 201 are balanced to achieve relative fixation.

By controlling the current of the coil of the third drive unit, the system drives the magnet of the third drive unit to drive the anti-shake bracket 6 to move along the Z-axis. The Hall element of the third drive unit is used to feedback the Z-axis displacement of the anti-shake bracket 6 . Since the lens carrier 2 and the anti-shake bracket 6 are relatively fixed in the Z-axis direction, the lens can be driven to move along the Z-axis to achieve zooming. The attractive force generated between the third drive unit magnet and the housing 1 is balanced by the supporting force generated by the vertical balls 704 at the two corners of the anti-shake bracket 6, so that the anti-shake bracket 6 is placed close to the base of the third drive unit magnet. On one side, the interference caused by the anti-shake movement of the lens carrier 2 in the X-axis direction can be avoided; the cooperation between the chute and the slider can avoid the interference caused by the anti-shake movement of the lens carrier 2 in the Y-axis direction.

Adopting the solution in this embodiment, the anti-shake mechanism adopts a sliding support structure with 2 degrees of freedom; with the anti-detachment structure, the anti-shake mechanism can slide along the two degrees of freedom of the XY axis, and the suspension wire structure is no longer used to connect the lens carrier. 2 and anti-shake bracket 6. The zoom mechanism can also use a vertical sliding mechanism to cooperate with the anti-detachment structure, so that the anti-shake bracket 6 and the lens carrier 2 move along the Z-axis direction, and the suspension wire or spring structure is also not used to connect the base 7 and the anti-shake bracket 6 . Reducing the application of suspension wire and spring structures will help avoid the problems of complex suspension wire structures, extremely difficult production, high requirements for installation accuracy and positioning accuracy, and easy damage, as well as avoid the instability of the optical axis due to the variability of the spring structure. Problems such as poor performance, slow response speed, and high power consumption.

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

The above examples are only used to illustrate the present invention. In addition, there are many different implementations, and these implementations can be thought of by those skilled in the art after understanding the idea of the present invention. Therefore, they will not be explained here. List one.

Claims (10)

1. A lens driving device includes a base and an anti-shake mechanism arranged on the base; the anti-shake mechanism includes a lens carrier, an anti-shake bracket and an anti-shake drive unit; characterized in that the lens carrier and the anti-shake A 2-degree-of-freedom sliding support structure is provided between the brackets.
2. The lens driving device according to claim 1, wherein the 2-DOF horizontal sliding support structure adopts a ball sliding support structure, and a number of supporting balls are provided between the lens carrier and the anti-shake bracket, so The bottom of the lens carrier is provided with a carrier chute that accommodates the support ball; the 2-degree-of-freedom horizontal sliding support structure is also provided with an anti-detachment structure that prevents the lens carrier from detaching from the anti-shake bracket.
3. The lens driving device according to claim 2, further comprising a focusing mechanism, the focusing mechanism including a focus driving unit and a vertical sliding support structure.
4. The lens driving device according to claim 3, wherein the vertical sliding support structure includes a plurality of vertical sliding balls, ball receiving grooves and vertical sliding grooves that cooperate with the vertical sliding balls; There are at least two sliding grooves; the vertical sliding support structure is also provided with an anti-separation structure to prevent the base from being separated from the anti-shake bracket.
5. The lens driving device according to claim 4, wherein the base and the anti-shake bracket are both rectangular frames, and there are two sliding grooves, which are respectively provided at two adjacent ones of the rectangular frame. corner.
6. The lens driving device according to claim 3, wherein the anti-detachment structure is composed of a magnet of the driving unit and a magnetic piece.
7. The lens driving device according to claim 3, wherein the coils of the anti-shake driving unit and the focusing driving unit are fixedly connected to the base through a PCB board.
8. The lens driving device according to claim 7, wherein the PCB board is an FPC board.
9. A camera device, characterized by comprising the lens driving device according to claim 1.
10. A mobile terminal, characterized by comprising the camera device according to claim 1.