Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame, a carrier, an induction chip and a magnet sensor, the frame is annular, is suspended above the base and is connected with the base through a support rod, and the frame is arranged to be capable of moving along a first direction and a second direction. The carrier is annular and is located in a ring of the frame, the radial outer side of the carrier is provided with a protruding plate, the protruding plate is located on the top face of the frame, the carrier is used for installing a lens and is arranged to move in the optical axis direction of the lens, and the optical axis direction, the first direction and the second direction are perpendicular to each other. And the sensing chip is connected with the protruding plate. And the magnet sensor is connected with the frame and is positioned below the sensing chip.

Description

Technical Field

[0001] The utility model relates to the technical field of optical element driving, in particular to a lens driving mechanism. Background Art

[0002] With the development of technology, many electronic devices (such as smart phones or digital cameras) now have the function of taking photos or recording videos. These electronic devices are becoming more and more popular and are developing in the direction of convenient and lightweight designs to provide users with more choices.

[0003] Some electronic devices with camera or video recording functions are provided with a lens driving device to drive the optical components of the lens to move, thereby achieving the functions of automatic focusing and optical image stabilization.

[0004] In the prior art, in order to sense the position of the carrier, the sensing chip is generally installed on the radial inner side of the frame, and the magnetic sensor is located on the carrier. The magnetic sensor and the sensing chip are aligned along the first direction or the second direction. However, when the carrier moves along the optical axis, the relative displacement between the sensing chip and the magnetic sensor does not change much, and the position of the carrier cannot be accurately sensed, that is, the sensing is not sensitive enough. Utility Model Content

[0005] The utility model aims to provide a lens driving mechanism to solve the problems of the prior art.

[0006] In order to solve the above technical problems, the embodiment of the utility model provides a lens driving mechanism, comprising:

[0007] Base;

[0008] A frame, the frame is annular and suspended above the base and connected to the base via a support rod, the frame being configured to move in a first direction and a second direction;

[0009] A carrier, the carrier is annular and is located in the ring of the frame, a protruding plate is provided on the radial outer side of the carrier, the protruding plate is located on the top surface of the frame, the carrier is used to mount the lens and is arranged to move along the optical axis direction of the lens, the optical axis direction, the first direction and the second direction are perpendicular to each other;

[0010] A sensing chip connected to the protruding plate;

[0011] A magnetic sensor is connected to the frame and is located below the sensing chip.

[0012] In one embodiment, the lens driving mechanism further includes:

[0013] A first magnetic strip, wherein the first magnetic strip is connected to the frame;

[0014] a second magnetic strip connected to the frame; and

[0015] A first coil, wherein the first coil is connected to the carrier, and the first coil cooperates with the first magnetic bar and the second magnetic bar to drive the carrier to move along the optical axis;

[0016] The magnetic sensor is located on the bottom surface of the first magnetic strip.

[0017] In one embodiment, the frame has:

[0018] A first mounting groove, wherein the first mounting groove is formed by a depression on the top surface of the frame and is used for mounting the first magnetic strip; and

[0019] A second mounting groove, the second mounting groove is formed by a radial inner recess of the frame and is used for mounting the second magnetic strip;

[0020] The bottom wall of the first installation groove is provided with an escape opening;

[0021] The magnetic sensor is located in the avoidance opening.

[0022] In one embodiment, the frame has:

[0023] a first mounting groove, wherein the first mounting groove is formed by a depression on the bottom surface of the frame and is used for mounting the first magnetic strip; and

[0024] A second mounting groove, the second mounting groove is formed by a radial inner recess of the frame and is used for mounting the second magnetic strip;

[0025] The top surface of the frame is provided with an escape opening, which extends to the first mounting groove and is used for mounting the magnetic sensor.

[0026] In one embodiment, the bottom wall of the first mounting groove is provided with a boss, and the avoidance opening is formed by a depression on the top surface of the boss;

[0027] The bottom surface of the first magnet strip is provided with a receiving groove, and the receiving groove is used to receive the boss.

[0028] In one embodiment, the base is further provided with a built-in circuit, and the built-in circuit is electrically connected to the support rod;

[0029] The top surface of the protruding plate is provided with a connecting column;

[0030] The lens driving mechanism also includes:

[0031] an upper spring sheet, the upper spring sheet being located on the top of the frame and the carrier and connected to the frame, the connecting column and the supporting rod, the upper spring sheet being electrically connected to the sensing chip; and

[0032] A lower spring sheet is located at the bottom of the frame and the carrier and is connected to the frame and the carrier.

[0033] In one embodiment, the top surface of the protruding plate is provided with two limit blocks, and the two limit blocks are arranged at intervals;

[0034] The lens driving mechanism further includes a sensing circuit board, which is located on the top surface of the protruding plate and connected to the top surface of the sensing chip. The sensing chip is provided with two limiting grooves, and the two limiting grooves are respectively sleeved outside the two limiting blocks;

[0035] The connecting column is located on the top surface of the limiting block;

[0036] The protruding plate is provided with a hollow area, and the hollow area is used to accommodate the sensing chip.

[0037] In one embodiment, two electrical connection components are disposed on the top surface of the carrier, and the electrical connection components are located radially outside the carrier and electrically connected to the sensing circuit board, and are used to electrically connect the upper spring sheet and the electrical connection components.

[0038] In one embodiment, the sensing circuit board is provided with a groove and an electrical connection terminal, and the electrical connection terminal is located in the groove;

[0039] The two electrical connection components are located in the groove and connected to the two electrical connection ends.

[0040] In one embodiment, the frame is provided with a limiting groove, and the limiting groove is formed by a depression on a side of the frame opposite to the first magnetic strip;

[0041] A limiting protrusion is provided on the radial outer side of the carrier, and the limiting protrusion is located in the limiting groove.

[0042] In the present invention, the sensing chip is located above the magnetic sensor, and the carrier moves in the vertical direction, and the distance between the two changes significantly, so the position of the carrier can be accurately sensed. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 , Figure 2 and Figure 3 FIG. 4 is an exploded view of a lens driving mechanism according to an embodiment of the present invention.

[0044] Figure 4 yes Figure 2Assembly diagram of the frame, carrier and upper spring in the illustrated embodiment.

[0045] Figure 5 , Figure 6 and Figure 7 yes Figure 2 An exploded view of the frame, the carrier, and the first magnetic strip, the second magnetic strip, and the magnetic sensor on the frame in the illustrated embodiment.

[0046] Figure 8 It is an exploded view of the frame, the first magnetic strip, the second magnetic strip and the magnetic sensor in another embodiment of the present invention.

[0047] Fig. 9 yes Figure 1 Assembly diagram of the lens drive mechanism in the illustrated embodiment.

[0048] Fig.10 yes Fig. 9 Section view along line AA.

[0049] Reference numerals: 100, lens drive mechanism; 1, base; 2, frame; 21, first magnetic strip; 22, second magnetic strip; 23, first mounting groove; 24, boss; 25, avoidance; 26, accommodating groove; 27, recessed area; 28, limiting groove; 3, carrier; 31, protruding plate; 32, limiting block; 33, connecting column; 34, electrical connection component; 35, hollow area; 36, magnetic sensor; 37, limiting protrusion; 4, upper spring leaf; 5, lower spring leaf; 6, support rod; 7, housing; 8, circuit board; 9, induction chip; 91, induction circuit board; 92, electrical connection terminal; 93, limiting groove; 94, groove; DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0051] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0052] The following will be combined with the accompanying drawings to describe the various embodiments of the present invention in detail, so as to more clearly understand the purpose, characteristics and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0053] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0054] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0055] In the following description, in order to clearly demonstrate the structure and working mode of the utility model, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0056] The present invention relates to a lens driving mechanism 100, which includes a base 1, a frame 2, a carrier 3, an upper yellow plate, a lower yellow plate, four support rods 6 and a shell 7. The shell 7 is connected to the base 1 and forms a receiving space for receiving the frame 2, the carrier 3, the upper spring plate 4, the lower spring plate 5 and the four support rods 6. The base 1 is in the shape of a rectangular plate and has a built-in circuit inside. A circuit board 8 is stacked on the top surface of the base 1, and the circuit board 8 is electrically connected to the built-in circuit in the base 1.

[0057] The frame 2 is annular and suspended above the base 1, and is connected to the base 1 through four support rods 6. Specifically, the bottom ends of the four support rods 6 are respectively located at the four corners of the base 1 and the bottom ends are respectively connected to the base 1, and the top ends are connected to the frame 2 so that the frame 2 is suspended above the base 1. The frame 2 is provided with a plurality of magnetic bars.

[0058] The carrier 3 is also annular and is located inside the ring of the frame 2. The carrier 3 is used to install the lens. A first coil is wound around the outside of the carrier 3. The first coil cooperates with the magnetic strip on the frame 2 to drive the carrier 3 to move along the optical axis direction of the lens, that is, vertically, to adjust the focal length.

[0059] The upper spring leaf 4 and the lower spring leaf 5 are both elastic, the upper spring leaf 4 is located at the top of the frame 2 and the carrier 3, and the lower spring leaf 5 is located at the bottom of the frame 2 and the carrier 3. The upper spring leaf 4 and the lower spring leaf 5 are respectively connected to the frame 2 and the carrier 3. After the carrier 3 moves, the upper spring leaf 4 and the lower spring leaf 5 can drive the carrier 3 to reset.

[0060] In addition, the support rod 6 can also conduct electricity and be electrically connected to the built-in circuit of the base 1, and also to the upper spring leaf 4, and the upper spring leaf 4 is also electrically connected to the first coil. After the built-in circuit of the base 1 is connected to an external power supply, it can power the first coil.

[0061] A second coil is also provided in the circuit board 8, and the second coil cooperates with the magnet bar to drive the frame 2 to move in the first direction or the second direction to prevent the lens from shaking. The first direction and the second direction are perpendicular to the optical axis direction of the lens.

[0062] A protruding plate 31 is provided on the radial outer side of the carrier 3, and the protruding plate 31 is located on the top surface of the frame 2. The sensing chip 9 is mounted on the protruding plate 31, and a magnet sensor 36 is also provided on the frame 2. The magnet sensor 36 is located below the sensing chip 9 and is aligned with the sensing chip 9 along the optical axis. The sensing chip 9 can sense the magnetic field of the magnet sensor 36 to determine the position of the carrier 3. The sensing chip 9 and the magnet sensor 36 form a Hall sensor structure. The sensing chip 9 determines the distance between the frame 2 and the carrier 3 by sensing the magnetic field of the magnet sensor 36, that is, the distance the carrier 3 moves along the optical axis.

[0063] In the prior art, the sensing chip 9 is installed on the radial inner side of the frame 2, and the magnetic sensor 36 is located on the radial outer side of the carrier 3. The magnetic sensor 36 and the sensing chip 9 are aligned along the first direction or the second direction. However, when the carrier 3 moves along the optical axis, the relative displacement between the sensing chip 9 and the magnetic sensor 36 does not change much, and the position of the carrier 3 cannot be accurately sensed, that is, the sensing is not sensitive enough. In the present invention, the sensing chip 9 is located above the magnetic sensor 36, and the carrier 3 moves in the vertical direction. The distance between the two changes significantly, and the position of the carrier 3 can be accurately sensed.

[0064] The three adjacent sides of the frame 2 are respectively provided with mounting grooves, one of which is provided with a first mounting groove 23, and the other two oppositely arranged sides are respectively provided with second mounting grooves. The first mounting groove 23 is formed by a recess on the top surface, bottom surface or radial inner side of the frame 2, and the second mounting groove is formed by a recess on the radial inner side of the frame 2.

[0065] The plurality of magnet bars include a first magnet bar 21 and a second magnet bar 22 . The second magnet bar 22 is installed in the first installation groove 23 , and the two second magnet bars 22 are installed in the two second installation grooves respectively.

[0066] The magnetic sensor 36 can be installed on the top surface of the frame 2 or directly on the top surface of the first magnetic strip 21 or the second magnetic strip 22 , as long as it is disposed on the frame 2 and aligned with the sensing chip 9 in the vertical direction.

[0067] exist Figure 4-6 In the embodiment shown, the first mounting groove 23 is formed by a depression on the bottom surface of the frame 2, and the top surface of the frame 2 is further provided with a depression area 27, which is used to avoid the protruding plate 31. The bottom wall of the depression area 27 is provided with an avoidance opening 25, which is used to install the magnet sensor 36.

[0068] In addition, the avoidance opening 25 is also connected to the first installation groove 23 , and the magnet sensor 36 is located on the top surface of the first magnet bar 21 .

[0069] exist Figure 7-8 In the illustrated embodiment, the first installation groove 23 is formed by a depression in the top surface of the frame 2 , a boss 24 is provided on the bottom wall of the first installation groove 23 , and a relief opening 25 for installing the magnetic sensor 36 is provided on the top surface of the boss 24 .

[0070] The first magnet strip 21 is located in the first mounting groove 23 and a receiving groove 26 for receiving the boss 24 is provided on its bottom surface. In this case, the magnet sensor 36 is located at the inner bottom of the first magnet strip 21 .

[0071] Optionally, the avoidance opening 25 may also be formed by a depression in the bottom wall of the first installation groove 23 , the first magnet bar 21 is directly installed in the first installation groove 23 , and the magnet sensor 36 is located in the avoidance opening 25 .

[0072] Optionally, in Figure 4-5 In the illustrated embodiment, the protruding plate 31 is located outside of one side of the carrier 3 extending along the first direction and has two connecting posts 33 on the top surface. The two connecting posts 33 are arranged at intervals along the first direction and connected to the upper spring sheet 4, and are used to fix the upper spring sheet 4, facilitate the electrical connection between the upper spring sheet 4 and the sensing chip 9, and supply power to the sensing chip 9. The upper spring sheet 4 is connected to the protruding plate 31 through the connecting posts 33, which can prevent the upper spring sheet 4 from being pulled and stretched during the movement of the carrier 3. When the upper spring sheet 4 is stretched and stretched, it often drives the connection between it and the sensing chip 9, causing the connection to break, thereby causing the sensing chip 9 to be disconnected. It should be understood that in other embodiments, the upper spring sheet 4 can also be connected to the carrier 3 or the protruding plate 31 in other ways.

[0073] Optionally, two limit blocks 32 are provided on the top surface of the protruding plate 31, and the two limit blocks 32 are spaced apart along the first direction, and the two connecting pillars 33 are respectively located on the top surfaces of the two limit blocks 32. The sensing chip 9 is connected to the sensing circuit board 91 and is located on the bottom surface of the sensing circuit board 91. The sensing circuit board 91 is located on the top surface of the protruding plate 31 and is provided with two limit grooves 93, and the two limit grooves 93 are respectively sleeved outside the two limit blocks 32, which can prevent the sensing chip 9 from moving, that is, to ensure the stability of the sensing chip 9.

[0074] The protruding plate 31 is provided with a hollow area 35 , which is located below a portion of the sensing chip 9 and is used for mounting the sensing chip 9 below the sensing circuit board 91 .

[0075] The top surface of the carrier 3 is provided with two electrical connection components 34, which are located radially outward of the carrier 3 and adjacent to the protruding plate 31, and the side of the sensing circuit board 91 facing the carrier 3 is provided with a groove 94, which can accommodate the two electrical connection components 34, and the sensing circuit board 91 is also provided with two electrical connection terminals 92, which are located in the groove 94 and are respectively electrically connected to the two electrical connection components 34. The two electrical connection components 34 are respectively electrically connected to the upper spring sheet 4, and the two electrical connection terminals 92 are electrically connected to the sensing chip 9, that is, the sensing circuit board 91 is electrically connected to the upper spring sheet 4 through the two electrical connection terminals 92 and the two electrical connection components 34.

[0076] Optionally, the frame 2 is further provided with a limiting groove 9428, which is formed by a depression on one side of the frame 2 opposite to the first magnet strip 21 and passes through the frame 2 in the vertical direction, and a limiting protrusion 37 is provided on the radial outer side of the carrier 3, and the limiting protrusion 37 is located in the limiting groove 9428. The limiting groove 9428 can limit the rotation of the limiting protrusion 37 in the circumferential direction, but does not hinder its movement in the vertical direction. That is, the limiting groove 9428 can limit the rotation of the carrier 3, but does not limit its movement in the vertical direction to adjust the focal length.

[0077] Preferred embodiments of the present invention have been described in detail above, but it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0078] These and other changes can be made to the embodiments in light of the above detailed description.In general, in the claims, the terms used should not be considered limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0079] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A lens driving mechanism, characterized in that: include: Base; A frame, the frame is annular and suspended above the base and connected to the base via a support rod, the frame being configured to move in a first direction and a second direction; A carrier, the carrier is annular and is located in the ring of the frame, a protruding plate is provided on the radial outer side of the carrier, the protruding plate is located on the top surface of the frame, the carrier is used to mount the lens and is arranged to move along the optical axis direction of the lens, the optical axis direction, the first direction and the second direction are perpendicular to each other; A sensing chip connected to the protruding plate; A magnetic sensor is connected to the frame and is located below the sensing chip.

2. The lens driving mechanism according to claim 1, characterized in that: The lens driving mechanism also includes: A first magnetic strip, wherein the first magnetic strip is connected to the frame; a second magnetic strip connected to the frame; and A first coil, wherein the first coil is connected to the carrier, and the first coil cooperates with the first magnetic bar and the second magnetic bar to drive the carrier to move along the optical axis; The magnetic sensor is located on the bottom surface of the first magnetic strip.

3. The lens driving mechanism according to claim 2, characterized in that: The framework has: A first mounting groove, wherein the first mounting groove is formed by a depression on the top surface of the frame and is used for mounting the first magnetic strip; and A second mounting groove, the second mounting groove is formed by a radial inner recess of the frame and is used for mounting the second magnetic strip; The bottom wall of the first installation groove is provided with an escape opening; The magnetic sensor is located in the avoidance opening.

4. The lens driving mechanism according to claim 2, characterized in that: The framework has: a first mounting groove, wherein the first mounting groove is formed by a depression on the bottom surface of the frame and is used for mounting the first magnetic strip; and A second mounting groove, the second mounting groove is formed by a radial inner recess of the frame and is used for mounting the second magnetic strip; The top surface of the frame is provided with an escape opening, which extends to the first mounting groove and is used for mounting the magnetic sensor.

5. The lens driving mechanism according to claim 3, characterized in that: The bottom wall of the first mounting groove is provided with a boss, and the avoidance opening is formed by a depression on the top surface of the boss; The bottom surface of the first magnet strip is provided with a receiving groove, and the receiving groove is used to receive the boss.

6. The lens driving mechanism according to claim 1, characterized in that: The base is also provided with a built-in circuit, and the built-in circuit is electrically connected to the support rod; The top surface of the protruding plate is provided with a connecting column; The lens driving mechanism also includes: An upper spring sheet, the upper spring sheet is located on the top of the frame and the carrier, and is connected to the frame, the connecting column and the supporting rod, and the upper spring sheet is electrically connected to the sensing chip; as well as A lower spring sheet is located at the bottom of the frame and the carrier and is connected to the frame and the carrier.

7. The lens driving mechanism according to claim 6, characterized in that: The top surface of the protruding plate is provided with two limit blocks, and the two limit blocks are arranged at intervals; The lens driving mechanism further includes a sensing circuit board, which is located on the top surface of the protruding plate and connected to the top surface of the sensing chip. The sensing chip is provided with two limiting grooves, and the two limiting grooves are respectively sleeved outside the two limiting blocks; The connecting column is located on the top surface of the limiting block; The protruding plate is provided with a hollow area, and the hollow area is used to accommodate the sensing chip.

8. The lens driving mechanism according to claim 7, characterized in that: Two electrical connection components are disposed on the top surface of the carrier. The electrical connection components are located radially outside the carrier and are electrically connected to the induction circuit board, and are used to electrically connect the upper spring sheet and the electrical connection components.

9. The lens driving mechanism according to claim 8, characterized in that: The induction circuit board is provided with a groove and an electrical connection terminal, and the electrical connection terminal is located in the groove; The two electrical connection components are located in the groove and connected to the two electrical connection ends.

10. The lens driving mechanism according to claim 2, characterized in that: The frame is provided with a limiting groove, and the limiting groove is formed by a depression on a side of the frame opposite to the first magnetic strip; A limiting protrusion is provided on the radial outer side of the carrier, and the limiting protrusion is located in the limiting groove.

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