Optical element driving mechanism

Abstract

The utility model discloses a kind of optical element driving mechanisms, including base and carrier, the side of base is equipped with magnetic sheet and rolling element, the magnetic sheet has through-hole, the center of the through-hole is located above the center of the magnetic sheet. The carrier is scrollably connected with the rolling element, and can move along vertical direction;Magnet group is arranged on the carrier and is arranged opposite to the magnetic sheet and is attracted to each other, and the center of magnet group along vertical direction overlaps with the center of the magnetic sheet along vertical direction. After setting through-hole in the upper part of the middle part of the magnetic sheet, the adsorption between the upper part of through-hole on the magnetic sheet and magnet group is less than the adsorption between the lower part of through-hole on the magnetic sheet and magnet group, to ensure its moving stability.

Description

Technical Field

[0001] This utility model relates to the field of optical element driving technology, and in particular to an optical element driving mechanism. Background Technology

[0002] In existing optical element driving mechanisms, the carrier moves along the optical axis for focusing, but after stopping, it shakes, affecting the image quality, so improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide an optical element driving mechanism to solve the problems of the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides an optical element driving mechanism, comprising:

[0005] A base, wherein a magnetic guide plate and a rolling element are provided on one side of the base; the magnetic guide plate has a through hole, the center of which is located above the center of the magnetic guide plate; and

[0006] The carrier is rotatably connected to the rolling element and can move in the vertical direction; the carrier is provided with a group of magnets that are opposite to and attracted to the magnetic sheet, and the center of the magnet group in the vertical direction overlaps with the center of the magnetic sheet in the vertical direction.

[0007] In one embodiment, the through hole is a rectangular hole.

[0008] In one embodiment, the magnetic conductive sheet is rectangular;

[0009] The magnet group is in the shape of a rectangular block.

[0010] In one embodiment, the carrier is provided with a coil group, which is arranged opposite to the magnet group and cooperates with the magnet group to drive the carrier to move in the vertical direction.

[0011] In one embodiment, the base is provided with two first guide grooves extending in a vertical direction;

[0012] The carrier is provided with two second guide grooves that are respectively arranged opposite to the two first guide grooves and accommodate the two rolling elements.

[0013] In one embodiment, the coil assembly is located between the two first guide slots;

[0014] The magnet assembly is located between the two second guide slots.

[0015] In one embodiment, the vertical dimension of the magnetic conductive sheet is larger than the vertical dimension of the magnet assembly.

[0016] In one embodiment, the optical element driving mechanism further includes a circuit board located between the coil group and the magnetic sheet.

[0017] In one embodiment, the base includes:

[0018] Base plate;

[0019] Side plate, the side plate being connected to the top surface of the bottom plate;

[0020] The side plate is provided with two of the first guide grooves;

[0021] The magnetic conductive sheet is located on the side plate;

[0022] The carrier is located on the top surface of the base, and two second guide grooves are provided on the outer side of the carrier.

[0023] In one embodiment, an inner wall of one of the second guide grooves or one of the first guide grooves is in contact with the rolling element line.

[0024] This invention features a through-hole located in the upper middle part of the magnetic sheet. The attraction between the upper part of the magnetic sheet and the magnet assembly through the through-hole is less than the attraction between the lower part of the magnetic sheet and the magnet assembly. The through-hole separates the upper and lower parts of the magnetic sheet. The magnetic attraction between the upper part and the magnet assembly allows the carrier to move against the base and the side where it is rolled, ensuring stability. Meanwhile, the magnetic attraction between the lower part and the magnet assembly keeps the carrier stably stationary at the lowest position, preventing wobbling and achieving a locking effect at the bottom. Attached Figure Description

[0025] Figure 1 and Figure 2 These are exploded views of an optical element driving mechanism according to one embodiment of this utility model.

[0026] Figure 3 yes Figure 1 Exploded view of the base, carrier, and magnetic sheet in the illustrated embodiment.

[0027] Figure 4 yes Figure 1 Assembly diagram of the optical element driving mechanism in the illustrated embodiment.

[0028] Figure 5 yes Figure 4 A cross-sectional view of the optical element driving mechanism along line AA in the embodiment shown.

[0029] Reference numerals: 100, Optical element driving mechanism; 1, Base; 11, Base plate; 12, Side plate; 13, Mounting groove; 14, Recessed area; 15, First guide groove; 2, Carrier; 21, Magnet group; 22, Groove; 23, Second guide groove; 24, Plane; 3, Magnetic sheet; 31, Through hole; 4, Circuit board; 41, Sensing element; 5, Housing; 6, Coil group; 7, Rolling element. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0031] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0032] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of this utility model. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of this utility model, but are merely illustrative of the essential spirit of the technical solution of this utility model.

[0033] Throughout this specification, references to "an 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. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0034] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0035] In the following description, in order to clearly demonstrate the structure and working method of this utility model, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0036] This utility model relates to an optical element driving mechanism 100, which includes a base 1 and a carrier 2. A magnetic guide sheet 3 and a rolling element 7 are provided on one side of the base 1. The magnetic guide sheet 3 has a through hole 31, and the center of the through hole 31 is located above the center of the magnetic guide sheet 3.

[0037] The carrier 2 and the base 1 are rotatably connected. The carrier 2 is used to mount the lens. The carrier 2 can drive the lens to move in the vertical direction, which is the direction of the optical axis. The lens can achieve the effect of focusing when it moves in the vertical direction.

[0038] In addition, the carrier 2 is provided with a magnet group 21 that is opposite to the magnetic sheet 3 and attracts each other. The center of the magnet group 21 in the vertical direction overlaps with the center of the magnetic sheet 3 in the vertical direction. That is to say, the center of the through hole 31 is located above the center of the magnet group 21 and the center of the magnetic sheet 3.

[0039] With a through hole 31 positioned slightly above the center of the magnetic sheet 3, the attraction between the upper part of the magnetic sheet 3 with the magnet group 21 and the through hole 31 is less than the attraction between the lower part of the magnetic sheet 3 with the magnet group 21. In other words, the through hole 31 separates the upper and lower parts of the magnetic sheet 3. The magnetic attraction between the upper part and the magnet group 21 allows the carrier 2 to move against the base 1 and the side where the carrier 2 is rotatably connected, ensuring its stability. Meanwhile, the magnetic attraction between the lower part and the magnet group 21 keeps the carrier 2 stably stationary at the lowest position, preventing wobbling and achieving a locking effect at the bottom.

[0040] At the same time, the attraction between the lower part of the magnetic sheet 3 and the magnet group 21 will give the magnet group 21 and the carrier 2 a vertical deviation force, so that the carrier 2 stays precisely at the lowest position without moving. This deviation force is similar to the effect of two magnets automatically aligning under the action of magnetic attraction when there is only a slight misalignment between them, ensuring the precise positioning of the carrier 2 at the lowest position.

[0041] In this design, the locking effect of the carrier 2 at the lowest position is achieved by the cooperation of the magnetic sheet 3 and the magnet. This means that the carrier 2 does not need to be powered on the coil when it is at the lowest position, so that it can maintain the Lorentz force. This overcomes the defect of the previous technical solution that required the Lorentz force between the energized coil and the magnet to lock the position of the carrier 2, and reduces the power consumption of the motor.

[0042] As a preferred embodiment, the through hole 31 is a rectangular hole, and the center of the through hole 31 along the vertical direction is also located above the center of the magnet group 21 and the center of the magnetic sheet 3.

[0043] Preferably, the magnetic conductive sheet 3 is rectangular, while the magnet assembly 21 is rectangular. The cross-section of the magnetic conductive sheet 3 in the vertical direction can be the same as the cross-section of the magnet assembly 21 in the vertical direction. Alternatively, preferably, the dimension of the magnetic conductive sheet 3 in the vertical direction is larger than the dimension of the magnet assembly 21 in the vertical direction. As the carrier 2 moves in the vertical direction, the range of movement of the magnet assembly 21 in the vertical direction will not exceed the bottom and top edges of the magnetic conductive sheet 3.

[0044] The carrier 2 is provided with a coil group 6, which is arranged opposite to the magnet group 21 and cooperates with the magnet group 21 to drive the carrier 2 to move in the vertical direction.

[0045] The base 1 includes a base plate 11 and a side plate 12. The base plate 11 is rectangular and the side plate 12 is connected to one side edge of the base plate 11.

[0046] The carrier 2 is located on the top surface of the base plate 11, and a groove 22 for mounting the magnet assembly 21 is provided on the radial outer side of the carrier 2. The side plate 12 is provided with a mounting groove 13 for mounting the coil assembly 6, and the coil assembly 6 and the magnet assembly 21 on the outer side of the carrier 2 are arranged opposite to each other.

[0047] The side plate 12 also has a recessed area 14 on its outer side, which is connected to a mounting groove 13. The mounting groove 13 is formed by the inner wall of the recessed area 14 recessed to the inner side of the side plate 12. A circuit board 4 is installed in the recessed area 14, and the circuit board 4 is electrically connected to the coil group 6. The magnetic conductive sheet 3 is located in the recessed area 14 and is attached to the outer side of the circuit board 4.

[0048] The side plate 12 is also provided with two first guide grooves 15 extending in the vertical direction, both of which are V-shaped;

[0049] The carrier 2 is provided with two second guide grooves 23, which are respectively arranged opposite to two first guide grooves 15. Each second guide groove 23 and the corresponding first guide groove 15 cooperate to form a space for accommodating the rolling element 7. Figure 1-4 In the embodiment shown, the rolling element 7 is a roller. It should be understood that in other embodiments, the rolling element 7 may also be a ball.

[0050] When the carrier 2 moves in the vertical direction, the roller can act as a guide and also prevent the carrier 2 from directly contacting the side plate 12. The rolling friction between the carrier 2 and the roller can reduce the wear on the side plate 12 and the carrier 2.

[0051] Preferably, the inner wall of one of the first guide grooves 15 is a plane 24, which contacts the roller axis, and the other first guide groove 15 is a V-shaped groove, with its two side walls respectively contacting the roller axis. Both second guide grooves 23 are V-shaped grooves, and the two side walls of each V-shaped groove respectively contact the corresponding roller axis.

[0052] Preferably, the inner wall of one of the second guide grooves 23 is a plane 24, as shown below. Figure 4 As shown, plane 24 contacts the roller axis, and the other second guide groove 23 is a V-shaped groove, with its two sidewalls respectively contacting the roller axis. Both first guide grooves 15 are V-shaped grooves, and the two sidewalls of each V-shaped groove respectively contact the corresponding roller axis.

[0053] Two first guide grooves 15 are located at the two ends of the side plate 12, while the mounting groove 13 and the coil assembly 6 are located between the two first guide grooves 15, with the coil assembly 6 preferably located in the middle of the two first guide grooves 15. Two second guide grooves 23 are located at two adjacent corners of the carrier 2, and the magnet assembly 21 is located between the two second guide grooves 23, preferably in the middle of the two second guide grooves 23.

[0054] The coil assembly 6 is also equipped with a sensing element 41, which is electrically connected to the circuit board 4 and can sense the position of the carrier 2 in conjunction with the magnet assembly 21.

[0055] The outer shell 5 is connected to the base plate 11 of the base 1 and covers the carrier 2 and the side plate 12, thus providing protection.

[0056] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0057] In light of the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0058] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. An optical element driving mechanism, characterized in that, include: A base, wherein a magnetic guide sheet and a rolling element are provided on one side of the base, the magnetic guide sheet has a through hole, and the center of the through hole is located above the center of the magnetic guide sheet; as well as The carrier is rotatably connected to the rolling element and can move in the vertical direction; the carrier is provided with a group of magnets that are opposite to and attracted to the magnetic sheet, and the center of the magnet group in the vertical direction overlaps with the center of the magnetic sheet in the vertical direction.

2. The optical element driving mechanism according to claim 1, characterized in that, The through hole is a rectangular hole.

3. The optical element driving mechanism according to claim 1, characterized in that, The magnetic conductive sheet is rectangular in shape; The magnet group is in the shape of a rectangular block.

4. The optical element driving mechanism according to claim 1, characterized in that, The carrier is equipped with a coil group, which is arranged opposite to the magnet group and cooperates with the magnet group to drive the carrier to move in the vertical direction.

5. The optical element driving mechanism according to claim 4, characterized in that, The base is provided with two first guide grooves extending in the vertical direction; The carrier is provided with two second guide grooves that are respectively arranged opposite to the two first guide grooves and accommodate the two rolling elements.

6. The optical element driving mechanism according to claim 5, characterized in that, The coil assembly is located between the two first guide slots; The magnet assembly is located between the two second guide slots.

7. The optical element driving mechanism according to claim 1, characterized in that, The vertical dimension of the magnetic conductive sheet is larger than the vertical dimension of the magnet assembly.

8. The optical element driving mechanism according to claim 4, characterized in that, The optical element driving mechanism also includes a circuit board located between the coil group and the magnetic sheet.

9. The optical element driving mechanism according to claim 5, characterized in that, The base includes: Base plate; Side plate, the side plate being connected to the top surface of the bottom plate; The side plate is provided with two of the first guide grooves; The magnetic conductive sheet is located on the side plate; The carrier is located on the top surface of the base, and two second guide grooves are provided on the outer side of the carrier.

10. The optical element driving mechanism according to claim 9, characterized in that, One of the second guide grooves or one of the inner walls of the first guide groove is in line contact with the rolling element.

Images