Lens driving device, photographic device, and electronic device

Abstract

The present invention discloses a lens driving device, which includes a carrier, a plurality of inner ring magnets distributed along the outer side of the carrier, a plurality of coils arranged outside the inner ring magnets, a plurality of outer ring magnets arranged outside the coils, and a yoke ring sleeved outside the carrier, the inner ring magnets, the coils and the outer ring magnets. In the present invention, there are two layers of magnets, namely inner ring magnets and outer ring magnets. Among them, the inner ring magnets are distributed along the outer circumferential surface of the carrier, the coils are distributed along the outer ring of the inner ring magnets, and the outer ring magnets are distributed along the outer circumferential surface of the coils. Compared with the prior art, under the condition of the same total thickness of the magnets, the magnetic field distribution of the present invention is more uniform. Under the condition of a uniform magnetic field, the linearity of the driving structure is better.

Description

Technical Field

[0001] The present invention relates to the field of motors, and more particularly, to a lens driving device, a photographic device, and an electronic device. Background Art

[0002] The installation space inside the motor is limited. In the existing driving structures, coils are basically distributed outside the carrier, and then quadrilateral magnets or corner magnets are distributed outside the coils. The defect of this distribution structure of coils and magnets is that it will cause insufficient thrust during the autofocus process of large motor products, thereby affecting the driving performance of the motor. Summary of the Invention

[0003] The purpose of the present invention is to provide a lens driving device, a driving device, and an electronic device for solving the problems existing in the prior art in view of the deficiencies in the prior art.

[0004] The technical problems solved by the present invention can be achieved by the following technical solutions:

[0005] A lens driving device includes a carrier, and further includes

[0006] a plurality of inner ring magnets distributed along the outer side of the carrier,

[0007] a plurality of coils arranged outside the inner ring magnets,

[0008] a plurality of outer ring magnets arranged outside the coils,

[0009] and a yoke ring sleeved outside the carrier, inner ring magnets, coils, and outer ring magnets.

[0010] Further, the carrier includes a hollow main body, a plurality of limiting protrusions are evenly distributed along the outer circumferential surface of the hollow main body, and a limiting ring is provided along the bottom edge of the hollow main body.

[0011] The top of the limiting protrusion is flush with the top of the hollow main body, and the bottom of the limiting protrusion is connected to the upper surface of the limiting ring; a plurality of the limiting protrusions and the limiting ring form a plurality of installation grooves on the outer circumferential surface of the hollow main body;

[0012] The inner ring magnets are arranged in the installation grooves.

[0013] Further, it further includes an upper elastic sheet, the upper elastic sheet is arranged on the top of the carrier, inner ring magnets, coils, and outer ring magnets, and the upper surface of the upper elastic sheet is connected to the inner surface of the yoke ring.

[0014] Further, it further includes a lower elastic sheet, the lower elastic sheet is located below the carrier, and the lower elastic sheet is arranged in the base.

[0015] Further, it further includes a base, the base is arranged at the bottom of the carrier, the base includes a plate-shaped main body, a through hole is opened in the middle position of the plate-shaped main body, and a limiting groove is arranged along the edge of the through hole;

[0016] One connecting groove is respectively arranged at the four corners of the base, and the connecting groove is communicated with the limiting groove;

[0017] The lower elastic piece is arranged in the limiting groove and the connecting groove.

[0018] Further, the through hole of the base is aligned with the hollow main body of the carrier.

[0019] Further, it further includes the terminal, the terminal has a first connection end and a second connection end, the first connection end is arranged in the connection groove of the base and is connected with the lower elastic piece, and the second connection end extends below the base.

[0020] Further, the lower elastic piece is connected with the first connection end of the terminal by dispensing glue.

[0021] A driving device, which is a lens driving device having the above structure.

[0022] An electronic device, which has a driving device having the above structure.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Under the condition of the same total thickness of the magnets, the magnetic field distribution is more uniform. Under the condition of a uniform magnetic field, the linearity of the driving structure is better.

[0025] 2. Under the condition of the same total thickness of the magnets, the magnetic flux increases by about 20%, the magnetic force increases by 20%, and then the motor thrust increases by about 20%. The power consumption is reduced and the total volume occupied by the magnets is smaller, saving raw materials.

[0026] 3. The increase in the number of magnet sheets will correspondingly enhance the magnetic field strength. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the lens driving device described in the present invention.

[0028] Figure 2 It is a schematic diagram of the lens driving device (excluding the yoke ring) described in the present invention.

[0029] Figure 3 It is a schematic structural diagram of the carrier described in the present invention.

[0030] Figure 4 It is a schematic diagram of the inner ring magnet described in the present invention.

[0031] Figure 5Schematic diagram of the coil described in the present invention.

[0032] Figure 6 Schematic diagram of the outer magnet described in the present invention.

[0033] Figure 7 Schematic diagram of the yoke ring described in the present invention.

[0034] Figure 8 Schematic diagram of the position of the upper elastic sheet described in the present invention.

[0035] Figure 9 Schematic diagram of the structure of the upper elastic sheet described in the present invention.

[0036] Figure 10 Schematic diagram of the position of the lower elastic sheet described in the present invention.

[0037] Figure 11 Schematic diagram of the structure of the lower elastic sheet described in the present invention.

[0038] Figure 12 Schematic diagram of the base described in the present invention.

[0039] Figure 13 Schematic diagram of the terminal described in the present invention.

[0040] Figure 14 Schematic diagram of the positions of the lower elastic sheet, the base and the terminal described in the present invention.

[0041] Figure 15 Schematic diagram of the structure of the square structure concerned described in the present invention. Detailed implementation manners

[0042] To make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0043] See Figures 1 to 11 , a lens driving device described in the present invention includes a carrier (1), and also includes a plurality of inner magnets (2) distributed along the outer side of the carrier (1),

[0044] a plurality of coils (3) arranged outside the inner magnets (2),

[0045] a plurality of outer magnets (4) arranged outside the coils (3),

[0046] and a yoke ring (5) sleeved outside the carrier (1), the inner magnets (2), the coils (3) and the outer magnets (4).

[0047] The carrier (1) includes a hollow main body (11), and a plurality of limiting protrusions (12) are uniformly distributed along the outer circumferential surface of the hollow main body (11), and a limiting ring (13) is provided along the bottom edge of the hollow main body (11).

[0048] The top of the limiting protrusion (12) is flush with the top of the hollow main body (11), and the bottom of the limiting protrusion (12) is connected to the upper surface of the limiting ring (13); a plurality of the limiting protrusions (12) and the limiting ring (13) form a plurality of mounting grooves (14) on the outer circumferential surface of the hollow main body (11);

[0049] The inner ring magnet (2) is arranged in the mounting groove (14).

[0050] An upper elastic sheet (6) is arranged on the tops of the carrier (1), the inner ring magnet (2), the coil (3) and the outer ring magnet (4), and the upper surface of the upper elastic sheet (6) is connected to the inner surface of the yoke ring (5).

[0051] A lower elastic sheet (7) is arranged below the carrier (1), and the lower elastic sheet (7) is arranged in the base (8).

[0052] A base (8) is arranged at the bottom of the carrier (1), the base (8) includes a plate-shaped main body (81), a through circular hole (82) is formed in the middle position of the plate-shaped main body (81), and a limiting groove (83) is arranged along the edge of the through circular hole (82);

[0053] A connecting groove (84) is respectively arranged at the four corners of the base (8), and the connecting groove (84) communicates with the limiting groove (83);

[0054] The lower elastic sheet (7) is arranged in the limiting groove (83) and the connecting groove (84).

[0055] The through circular hole (82) of the base (8) is aligned with the hollow main body (11) of the carrier (1).

[0056] The present invention further includes the terminal (9), the terminal (9) has a first connection end (91) and a second connection end (92), the first connection end (91) is arranged in the connection groove (84) of the base (8) and is connected to the lower elastic sheet (7), and the second connection end (92) extends below the base (8).

[0057] The lower elastic sheet (7) is connected to the first connection end (91) of the terminal (9) by dispensing glue.

[0058] Embodiment 1

[0059] A lens driving device includes a carrier (1), an inner ring magnet (2), a coil (3), an outer ring magnet (4), a yoke ring (5), an upper elastic sheet (6), a lower elastic sheet (7), a base (8) and a terminal (9).

[0060] See Figure 3 Figure 3 , the carrier (1) includes a hollow main body (11), and a plurality of limiting protrusions (12) are uniformly distributed along the outer circumferential surface of the hollow main body (11), and a limiting ring (13) is provided along the bottom edge of the hollow main body (11). The top of the limiting protrusion (12) is flush with the top of the hollow main body (11), and the bottom of the limiting protrusion (12) is connected to the upper surface of the limiting ring (13); a plurality of the limiting protrusions (12) and the limiting ring (13) form a plurality of mounting grooves (14) on the outer circumferential surface of the hollow main body (11); the inner ring magnet (2) is arranged in the mounting groove (14). A upper elastic sheet (6) is arranged on the tops of the carrier (1), the inner ring magnet (2), the coil (3) and the outer ring magnet (4), and the upper surface of the upper elastic sheet (6) is connected to the inner surface of the yoke ring (5).

[0061] See Figure 4 、 Figure 5 、 Figure 6 and Figure 7 Figure 7 , the inner ring magnet (2), the coil (3) and the outer ring magnet (4) are uniformly distributed along the outside of the carrier (1) from inside to outside in sequence. Specifically, the inner ring magnet (2), the coil (3) and the outer ring magnet (4) have a radian structure that matches the outer surface of the hollow main body (11), so as to achieve a better installation effect. After the inner ring magnet (2), the coil (3) and the outer ring magnet (4) are installed, the yoke ring (5) is arranged on the outermost side.

[0062] See Figure 8 and Figure 9 Figure 9 , the upper elastic sheet (6) is arranged on the tops of the carrier (1), the inner ring magnet (2), the coil (3) and the outer ring magnet (4), the lower surface of the lower elastic sheet (6) is located above the carrier (1), the inner ring magnet (2), the coil (3) and the outer ring magnet (4), and the upper surface of the upper elastic sheet (6) is connected to the inner surface of the yoke ring (5).

[0063] See Figure 10 and Figure 11 Figure 11 , the lower elastic sheet (7) is arranged in the base (8) below the carrier (1).

[0064] See Figure 12, the base (8) is arranged at the bottom of the carrier (1). The base (8) includes a plate-shaped main body (81), a through-round hole (82) is formed in the middle position of the plate-shaped main body (81), and a limiting groove (83) is arranged along the edge of the through-round hole (82); a connecting groove (84) is respectively arranged at the four corners of the base (8), and the connecting groove (84) communicates with the limiting groove (83); the lower elastic sheet (7) is arranged in the limiting groove (83) and the connecting groove (84). The through-round hole (82) of the base (8) is aligned with the hollow main body (11) of the carrier (1).

[0065] See Figure 13 and Figure 14 , the terminal (9) has a first connection end (91) and a second connection end (92). The first connection end (91) is arranged in the connection groove (84) of the base (8) and is connected to the lower elastic sheet (7), and the second connection end (92) extends below the base (8).

[0066] The lower elastic sheet (7) is connected to the first connection end (91) of the terminal (9) by dispensing glue.

[0067] In this embodiment, there are two layers of magnets, namely an inner ring magnet (2) and an outer ring magnet (4). Among them, the inner ring magnet (2) is distributed along the outer circumferential surface of the carrier (1), the coil (3) is distributed along the outer ring of the inner ring magnet (2), and the outer ring magnet (4) is distributed along the outer circumferential surface of the coil (3). Compared with the solution in the background technology where the coil is distributed along the surface of the carrier and the magnets are distributed at the four sides or four corners of the housing, this magnet distribution structure has the following advantages:

[0068] 1. The inner ring magnet (2) and the outer ring magnet (4) in this embodiment are joined end to end to form a ring. Compared with the relatively scattered magnet distribution at the four sides or four corners in the prior art, the magnetic field distribution is more uniform. Under the condition of a uniform magnetic field, the linearity of the driving structure is better.

[0069] 2. Under the condition that the total thickness of the magnets is the same, the magnetic flux is increased by about 20%, the magnetic force is increased by 20%, and thus the motor thrust is increased by about 20%. The power consumption is reduced and the total volume occupied by the magnets is smaller, saving raw materials.

[0070] 3. For the magnet distribution structure of the inner ring and the outer ring, the number of magnet pieces will increase correspondingly, and the magnetic field intensity will increase correspondingly.

[0071] In this embodiment, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of clearly expressing the technical solution and description, and therefore cannot be construed as a limitation to the present invention.

[0072] Example 2

[0073] A driving device has the lens driving device as described in Example 1. In this embodiment, the other structures of the driving device are the same as those in the prior art, so they will not be described in detail here.

[0074] Example 3

[0075] An electronic device has the driving device as described in Example 2. In this embodiment, the other structures of the electronic device are the same as those in the prior art, so they will not be described in detail here.

[0076] In the present invention, the hollow body can be cylindrical, or can be provided with other shapes, as long as other structures that can achieve the functions of the present invention are acceptable. For example Figure 15 the square structure shown in the figure. If the hollow body is a square structure, then the limiting protrusion (12) can be located at the corners of the hollow body, and the mounting groove (14) is located on the side of the hollow body. The yoke, magnet, elastic piece, and coil will change accordingly according to the change of the structure. Since its structural mode is the same as that of the cylindrical structure in the embodiment, it will not be described in detail here.

[0077] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only used to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A lens driving device, comprising a carrier (1), characterized in that: further comprising a plurality of inner ring magnets (2) distributed along the outer side of the carrier (1), a plurality of coils (3) arranged outside the inner ring magnets (2), a plurality of outer ring magnets (4) arranged outside the coils (3), and a yoke ring (5) sleeved outside the carrier (1), inner ring magnets (2), coils (3) and outer ring magnets (4); the inner ring magnets (2), coils (3) and outer ring magnets (4) are uniformly distributed along the outer side of the carrier (1) from inside to outside; the inner ring magnets (2) are distributed along the outer circumferential surface of the carrier (1), the coils (3) are distributed along the outer ring of the inner ring magnets (2), and the outer ring magnets (4) are distributed along the outer circumferential surface of the coils (3).

2. The lens driving device according to claim 1, characterized in that: the carrier (1) includes a hollow main body (11), a plurality of limiting protrusions (12) are uniformly distributed along the outer circumferential surface of the hollow main body (11), and a limiting ring (13) is provided along the bottom edge of the hollow main body (11); the top of the limiting protrusion (12) is flush with the top of the hollow main body (11), and the bottom of the limiting protrusion (12) is connected to the upper surface of the limiting ring (13); a plurality of the limiting protrusions (12) and the limiting ring (13) form a plurality of mounting grooves (14) on the outer circumferential surface of the hollow main body (11); the inner ring magnets (2) are arranged in the mounting grooves (14).

3. The lens driving device according to claim 1, characterized in that: further comprising an upper elastic sheet (6) arranged on the tops of the carrier (1), inner ring magnets (2), coils (3) and outer ring magnets (4), and the upper surface of the upper elastic sheet (6) is connected to the inner surface of the yoke ring (5).

4. The lens driving device according to claim 2, characterized in that: further comprising a lower elastic sheet (7) located below the carrier (1), and the lower elastic sheet (7) is arranged in a base (8).

5. The lens driving device according to claim 4, characterized in that: the base (8) is arranged at the bottom of the carrier (1), the base (8) includes a plate-shaped main body (81), a through circular hole (82) is opened at the middle position of the plate-shaped main body (81), and a limiting groove (83) is provided along the edge of the through circular hole (82); a connecting groove (84) is respectively provided at the four corners of the base (8), and the connecting groove (84) communicates with the limiting groove (83); the lower elastic sheet (7) is arranged in the limiting groove (83) and the connecting groove (84).

6. The lens driving device according to claim 5, characterized in that: the through circular hole (82) of the base (8) is aligned with the hollow main body (11) of the carrier (1).

7. The lens driving device according to claim 5, characterized in that: further comprising a terminal (9) having a first connection end (91) and a second connection end (92), the first connection end (91) is arranged in the connecting groove (84) of the base (8) and is connected to the lower elastic sheet (7), and the second connection end (92) extends below the base (8).

8. A photographic device, characterized in that: Having the lens driving device according to any one of claims 1-7.

9. An electronic device, characterized in that: having the photographic device according to claim 8.

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