Lens driving device

Abstract

The utility model belongs to optical component technology field, concretely relates to a lens drive arrangement, including base, drive mechanism and carrier, and carrier is located in the base, is driven by drive mechanism and is carried out longitudinal motion relative to base, the lateral wall on carrier is provided with first ball groove, the lateral wall on base is provided with second ball groove, and the inside and outside opposite settings of first ball groove and second ball groove form guide ball groove, and a plurality of first ball is provided in guide ball groove, and first ball contacts first ball groove and second ball groove respectively, and the second ball is provided between adjacent two first balls, and the outer diameter of second ball is less than first ball. The utility model sets up the second ball between adjacent two first balls in guide ball groove, and three balls will produce the effect of complementation under the rotation, improves the rolling guide effect of ball, finally makes carrier longitudinal motion, and the friction is small, and moves smoothly, avoids the shaking phenomenon.

Description

Technical Field

[0001] This utility model belongs to the field of optical component technology, specifically relating to a lens driving device. Background Technology

[0002] With the development of technology, many electronic devices today (such as smartphones or digital cameras) have the function of taking pictures or recording videos. The use of these electronic devices is becoming more and more common, and they are developing towards convenient and thinner designs to provide users with more choices.

[0003] Some electronic devices with photographic or video recording capabilities are equipped with a lens drive mechanism to drive optical components such as lenses to move, thereby achieving autofocus functionality.

[0004] Existing lens drive mechanisms typically achieve autofocus by having a carrier and a lens connected to the carrier move longitudinally relative to a base. During this longitudinal movement, the friction between the carrier and the base is often significant, leading to difficulties in movement, or even complete inability to move or shaking during movement, severely impacting the lens's autofocus function. Utility Model Content

[0005] The present invention addresses the aforementioned technical problems by providing a lens driving device.

[0006] A lens driving device includes a base, a driving mechanism, and a carrier. The carrier is located inside the base, and the driving mechanism is disposed between the middle of one side of the carrier and the middle of one side of the base. The driving mechanism drives the carrier to move longitudinally relative to the base.

[0007] A first ball groove is provided on the outer side wall of the carrier, and a second ball groove is provided on the inner side wall of the base. The first ball groove and the second ball groove are arranged opposite each other to form a guide ball groove. A plurality of first balls are arranged longitudinally in the guide ball groove. The first balls respectively contact the first ball groove and the second ball groove. A second ball is arranged between two adjacent first balls. The outer diameter of the second ball is smaller than that of the first ball.

[0008] Optionally, the carrier is a rectangular structure, and the first ball groove is provided on the outer side wall of the four corners of the carrier. The base is a rectangular frame structure, and the second ball groove is provided on the inner side wall of the four corners of the base. Four guide ball grooves are formed between the carrier and the base.

[0009] Optionally, two first ball grooves are provided on the outer wall of the carrier, and the two first ball grooves are located at both ends of the same side of the outer wall of the carrier. Two second ball grooves are provided on the inner wall of the base, and the two second ball grooves are located at both ends of the same side of the inner wall of the base, so that two guide ball grooves are formed on one side between the carrier and the base.

[0010] Optionally, the drive mechanism is located between the two guide ball grooves.

[0011] Optionally, the bottom of the second ball groove is provided with a bottom protrusion;

[0012] The lens driving device also includes a housing, which covers the outside of the base and has a hollow cavity between it and the base. The carrier and the driving mechanism are both disposed in the hollow cavity. The bottom of the housing is provided with a top protrusion, which is located above the guide ball groove.

[0013] Optionally, the top protrusion is formed by a downward indentation of the end wall of the housing.

[0014] Optionally, the driving mechanism is a piezoelectric mechanism, which includes a piezoelectric block and a friction rod. The piezoelectric block is mounted on the base, and the friction rod is connected to the piezoelectric block. The friction rod abuts against the carrier. When the piezoelectric block is energized and deformed, the friction rod drives the carrier to move longitudinally.

[0015] Optionally, an installation groove is provided on the outer wall of the carrier, and spring connection points are provided on the outer wall of the carrier on both sides of the installation groove;

[0016] The base is provided with a mounting protrusion, which is located in the mounting groove. A friction rod mounting groove is provided on the outer wall of the mounting protrusion, and the friction rod is located in the friction rod mounting groove.

[0017] The piezoelectric mechanism also includes a spring, the two ends of which are respectively connected to the spring connection points on both sides of the mounting groove. The friction rod is located between the spring and the friction rod mounting groove, and the outer wall of the friction rod abuts against the spring.

[0018] When the piezoelectric block is energized and deformed, the friction rod drives the spring and the carrier to move longitudinally.

[0019] Optionally, the piezoelectric mechanism further includes a counterweight plate, the piezoelectric block is mounted on the counterweight plate, and both the counterweight plate and the piezoelectric block are mounted in the piezoelectric mechanism mounting groove provided at the bottom of the base.

[0020] Optionally, the lens driving device further includes a circuit board surrounding the outside of the base, the end of the circuit board supplying power to the piezoelectric block through a base-embedded circuit within the base.

[0021] Optionally, a control chip is provided inside the circuit board. The control chip is located in a clearance notch on the side wall of the base and is used to control the energization state of the piezoelectric block.

[0022] Optionally, a position sensor is provided on the inner side of the circuit board, and a sensing magnet is provided on the carrier, with the sensing magnet and the position sensor being arranged opposite each other inside and outside;

[0023] The base is provided with a clearance groove, which is located between the sensing magnet and the position sensor.

[0024] Optionally, the circuit board is an FPC board.

[0025] Beneficial effects: This utility model has at least one or more of the following advantages:

[0026] 1. This utility model sets a second ball between two adjacent first balls in the guide ball groove. The three balls will produce a complementary effect under the rotation, which improves the rolling guidance effect of the balls. Ultimately, when the carrier moves longitudinally, the friction is small, the movement is smooth, and the shaking phenomenon is avoided.

[0027] 2. This utility model achieves longitudinal movement of the carrier by setting a driving mechanism between two adjacent guide ball grooves, and the driving is stable and reliable.

[0028] 3. This utility model uses the combined effect of the bottom protrusion and the top protrusion to limit the upper and lower positions of each ball rolling in the guide ball groove, thereby helping to limit the highest and lowest positions of the carrier.

[0029] 4. The drive mechanism of this utility model adopts a piezoelectric mechanism and improves the positional relationship between the piezoelectric block, friction rod and spring in the piezoelectric mechanism. Without affecting the autofocus function, the overall structure of the piezoelectric mechanism is simple and easy to install and maintain.

[0030] 5. This utility model enables power supply to the voltage block through the circuit board, controls the energization status of the piezoelectric mechanism through the control chip, and monitors the longitudinal movement position of the carrier through the cooperation of the position sensor and the sensing magnet. Attached Figure Description

[0031] Figure 1 This is an exploded view of the structure of this utility model;

[0032] Figure 2 for Figure 1 Another perspective illustration;

[0033] Figure 3 for Figure 1 Exploded view of the positional relationships of the middle section structure;

[0034] Figure 4 for Figure 3 Further exploded view;

[0035] Figure 5 This is a diagram showing the positional relationship between the base, drive mechanism, and carrier of this utility model;

[0036] Figure 6 for Figure 5 Exploded view;

[0037] Figure 7 This is a diagram showing the positional relationship between the base and the drive mechanism of this utility model;

[0038] Figure 8 for Figure 7 Exploded view;

[0039] Figure 9 This is a schematic diagram of the structure of the base of this utility model;

[0040] Figure 10 This is a top view of the structure of this utility model;

[0041] Figure 11 for Figure 10 AA section view;

[0042] Figure 12 for Figure 10 BB cross-sectional view. Detailed Implementation

[0043] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0044] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0045] 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.

[0046] 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.

[0047] Reference Figures 1 to 12 This embodiment provides a lens driving device, which includes a housing 10, a base 20, a driving mechanism 30, and a carrier 40.

[0048] The outer shell 10 is an optional structure. The outer shell 10 covers the outer layer of the base 20. The outer shell 10 and the base 20 are detachably connected and form a hollow cavity. The drive mechanism 30 and the carrier 40 are both disposed in the hollow cavity. The outer shell 10 and the base 20 are preferably connected by a snap-fit ​​to form the hollow cavity.

[0049] The outer casing 10, the base 20 and the carrier 40 are provided with a longitudinally connected lens through hole in the middle of the longitudinal direction (i.e., the up and down direction) to avoid or accommodate the lens. The lens is installed in the carrier 40 and the carrier 40 is set in the base 20. A drive mechanism 30 is provided between the middle of one side of the carrier 40 and the middle of one side of the base 20. Under the action of the drive mechanism 30, the carrier 40 and the lens move longitudinally relative to the base 20 to achieve the zoom effect of the lens.

[0050] A first ball groove 41 is provided on the outer side wall of the carrier 40, and a second ball groove 21 is provided on the inner side wall of the base 20. The first ball groove 41 and the second ball groove 21 are arranged opposite each other to form a guide ball groove. A plurality of first balls 51 are arranged longitudinally in the guide ball groove. The first balls 51 contact the first ball groove 41 and the second ball groove 21 respectively. A second ball 52 is arranged between two adjacent first balls 51. The outer diameter of the second ball 52 is smaller than that of the first ball 51.

[0051] This invention uses a second ball 52 positioned between two adjacent first balls 51 within a guide ball groove. The three balls are arranged as a group for guidance and to reduce motion friction. The three balls are arranged in a two-large-one-small configuration, with the two large balls contacting the inner wall of the guide ball groove. The working principle is as follows: For example, when the carrier 40 moves upward, the bottom first ball 51 rotates clockwise, and the middle second ball 52, which is in contact with the bottom first ball 51, rotates counterclockwise. Simultaneously, the top first ball 51, which is in contact with the middle second ball 52, rotates clockwise. In other words, it allows both first balls 51 in contact with the inner wall of the guide ball groove to rotate clockwise, while the middle second ball 52, which rotates counterclockwise, does not contact the inner wall of the guide ball groove or only contacts a portion of the guide ball groove on one side. This is because the outer diameter of the second ball 52 is smaller than that of the first ball 51. Therefore, the second ball 52 will not contact the inner walls of the guide ball grooves on both the inner and outer sides at the same time, and will not exert opposite forces on the inner walls of the guide ball grooves. The three balls will produce a complementary effect under the rotation, which improves the rolling guidance effect of the balls. Ultimately, when the carrier 40 moves longitudinally, the friction is small, the movement is smooth, and the shaking phenomenon is avoided.

[0052] like Figure 11 As shown, three balls, one large and one small, are arranged longitudinally in the guide ball groove formed by the first ball groove 41 and the second ball groove 21. From bottom to top, they are the bottom first ball 51, the middle second ball 52, and the top first ball 51.

[0053] Of course, in another example, the guide ball groove has five balls arranged longitudinally, three large and two small, from bottom to top: first ball, second ball, first ball, second ball, and first ball. In other examples, the guide ball groove has an odd number of balls arranged longitudinally, following a design where one second ball is placed between every two adjacent first balls. The number of balls can be determined based on the longitudinal length of the guide ball groove and the longitudinal travel of the carrier.

[0054] In one embodiment, the carrier 40 has a rectangular structure, and the outer sidewalls of the four corners of the carrier 40 are respectively provided with first ball grooves 41. The base 20 has a rectangular frame structure, and the inner sidewalls of the four corners of the base 20 are respectively provided with second ball grooves 21. Four guide ball grooves are formed between the carrier 40 and the base 20.

[0055] In one embodiment, reference is made to Figure 4 and Figure 6 Two first ball grooves 41 are provided on the outer wall of the carrier 40, and the two first ball grooves 41 are located at both ends of the same outer wall of the carrier 40. (Refer to...) Figure 4 and Figure 7Two second ball grooves 21 are provided on the inner side wall of the base 20. The two second ball grooves 21 are located at both ends of the inner side wall of the same side of the base 20, so that two guide ball grooves are formed on one side between the carrier 40 and the base 20.

[0056] In one embodiment, reference is made to Figure 5 The drive mechanism 30 is located between two guide ball grooves.

[0057] In this embodiment, a drive mechanism 30 is provided between two guide ball grooves on one side between the carrier 40 and the base 20 to drive the longitudinal movement of the carrier 40, which is stable and reliable.

[0058] In one embodiment, reference is made to Figure 9 and Figure 11 The bottom of the second ball groove 21 has an upwardly protruding bottom protrusion 22. (See reference...) Figure 1 , Figure 2 and Figure 11 The bottom of the inner casing 10 is provided with a downward protruding top protrusion 12, which is located above the guide ball groove.

[0059] In this embodiment, the bottom protrusion 22 and the top protrusion 12 work together to limit the upper and lower positions of each ball rolling in the guide ball groove, thereby helping to limit the highest and lowest positions of the carrier 40.

[0060] In one embodiment, the top protrusion 12 is formed by a downward indentation of the end wall of the outer casing 10. That is, the top protrusion 12 is integrally formed with the outer casing 10, which simplifies the manufacturing process.

[0061] In one embodiment, reference is made to Figures 3 to 8 The drive mechanism 30 employs a piezoelectric mechanism, which includes a piezoelectric block 31 and a friction rod 32. The piezoelectric block 31 is mounted on the base 20, specifically in the middle of one side of the base 20. The friction rod 32 is connected to the piezoelectric block 31 and abuts against the carrier 40. When the piezoelectric block 31 is energized, it deforms and returns to its original shape when the power is off. When the piezoelectric block 31 deforms due to energization, the friction rod 32 extends, thereby driving the carrier 40 to move longitudinally, thus enabling the zoom operation of the lens mounted on the carrier 40.

[0062] In one embodiment, reference is made to Figure 4 and Figure 6 An installation groove 42 is provided on the outer wall of the middle part of one side of the carrier 40. The installation groove 42 is an open structure with the outer side open. Spring connection points 43 are provided on the outer walls of the carrier 40 on both sides of the installation groove 42.

[0063] Reference Figures 4 to 7A mounting protrusion 23 is provided on the middle of one side of the base 20. The mounting protrusion 23 is located in the mounting groove 42. A friction rod mounting groove 24 is provided on the outer wall of the mounting protrusion 23. The friction rod mounting groove 24 is an open structure with the outer side open. The friction rod 32 is located in the friction rod mounting groove 24.

[0064] Reference Figures 3 to 6 The piezoelectric mechanism also includes a spring 33, with both ends of the spring 33 connected to the spring connection points 43 on both sides of the mounting groove 42. The friction rod 32 is located between the spring 33 and the friction rod mounting groove 24. Under the elastic action of the spring 33, the outer wall of the friction rod 32 abuts against the spring 33.

[0065] When the piezoelectric block 31 is energized and deformed, the friction rod 32 drives the spring 33 and the carrier 40 to move longitudinally, thereby realizing the zoom operation of the lens mounted on the carrier 40.

[0066] The drive mechanism 30 in this embodiment adopts a piezoelectric mechanism, and the positional relationship between the piezoelectric block 31, friction rod 32 and spring 33 in the piezoelectric mechanism has been improved. Without affecting the autofocus function, the overall structure of the piezoelectric mechanism is simple and easy to install and maintain.

[0067] In one embodiment, the groove shape of the friction rod mounting groove 24 is similar to or the same as the outer surface of the friction rod 32. For example, when the friction rod 32 is cylindrical, the friction rod mounting groove 24 is an arc-shaped groove, so that the inner sidewall of the friction rod 32 fits into the friction rod mounting groove 24.

[0068] In one embodiment, when there are two guide ball grooves on the same side between the carrier 40 and the base 20, the two spring connection points 43 are located between the two first ball grooves 41, and the mounting groove 42 is located between the two spring connection points 43.

[0069] When there are two guide ball grooves on the same side between the carrier 40 and the base 20, the mounting protrusion 23 is located between the two second ball grooves 21.

[0070] In one embodiment, reference is made to Figure 4 , Figure 6 , Figure 8 and Figure 12 The piezoelectric mechanism also includes a counterweight plate 34, and a piezoelectric block 31 is mounted on the counterweight plate 34. Both the counterweight plate 34 and the piezoelectric block 31 are mounted in the piezoelectric mechanism mounting groove 25 provided at the bottom of the base 20.

[0071] In one embodiment, reference is made to Figures 1 to 4 The lens driving device also includes a circuit board 60, which surrounds the outside of the base 20. The end of the circuit board 60 supplies power to the piezoelectric block 31 through the base built-in circuit inside the base 20.

[0072] In one embodiment, reference is made to Figure 3 and Figure 4 A control chip 61 is provided inside the circuit board 60. The control chip 61 is located in the clearance notch 26 on the side wall of the base 20. The control chip 61 is used to control the power-on state of the piezoelectric block 31.

[0073] In this embodiment, by placing the control chip 61 within the clearance notch 26, the thickness between the circuit board 60 and the base 20 is greatly reduced.

[0074] The clearance 26 is preferably located on the opposite side of the piezoelectric mechanism.

[0075] In a specific implementation, a reinforcing plate 64 can be provided on the outside of the circuit board 60. The reinforcing plate 64 is located outside the control chip 61. When the circuit board 60 surrounds the outside of the base 20, the reinforcing plate 64 is located outside the clearance notch 26. The outer wall of the reinforcing plate 64 can be roughly flush with the outer wall of one side of the clearance notch 26 of the base 20, and the outer wall of the other side of the clearance notch 26 is surrounded by the circuit board 60.

[0076] In one embodiment, reference is made to Figure 3 A position sensor 62 is disposed inside the circuit board 60, and a sensing magnet 63 is disposed on the carrier 40. The sensing magnet 63 and the position sensor 62 are disposed opposite each other. A clearance groove 27 is disposed on the base 20, which is located between the sensing magnet 63 and the position sensor 62. The clearance groove 27 makes the sensing between the sensing magnet 63 and the position sensor 62 more sensitive. The longitudinal movement position of the carrier 40 is monitored through the cooperation of the position sensor 62 and the sensing magnet 63.

[0077] In one embodiment, the circuit board 60 is an FPC board.

[0078] In one embodiment, the circuit board 60 has a horizontal, L-shaped structure.

[0079] In one embodiment, the circuit board 60 surrounds the outside of the base 20, which is away from the drive mechanism.

[0080] For example, when the base 20 is a rectangular frame structure, a driving mechanism is provided between the middle of one side wall and the carrier 40. The side wall of the base 20 opposite the driving mechanism is provided with an avoidance notch 26. An avoidance groove 27 is provided on the side wall adjacent to the avoidance notch 26. The circuit board 60 is surrounded by the side wall with the avoidance notch 26 and the side wall with the avoidance groove 27.

[0081] The preferred embodiments of this utility model have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to this utility model. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A lens driving device, the lens driving device comprising a base, a driving mechanism and a carrier, the carrier being located within the base; Its features are, The drive mechanism is provided between the middle of one side of the carrier and the middle of one side of the base, and the drive mechanism drives the carrier to move longitudinally relative to the base; A first ball groove is provided on the outer side wall of the carrier, and a second ball groove is provided on the inner side wall of the base. The first ball groove and the second ball groove are arranged opposite each other to form a guide ball groove. A plurality of first balls are arranged longitudinally in the guide ball groove. The first balls respectively contact the first ball groove and the second ball groove. A second ball is arranged between two adjacent first balls. The outer diameter of the second ball is smaller than that of the first ball.

2. The lens driving device as described in claim 1, characterized in that, The carrier has a rectangular structure, and the first ball groove is provided on the outer side wall of the four corners of the carrier. The base has a rectangular frame structure, and the second ball groove is provided on the inner side wall of the four corners of the base. Four guide ball grooves are formed between the carrier and the base. Alternatively, two first ball grooves are provided on the outer wall of the carrier, with the two first ball grooves located at both ends of the same side of the outer wall of the carrier, and two second ball grooves are provided on the inner wall of the base, with the two second ball grooves located at both ends of the same side of the inner wall of the base, so that two guide ball grooves are formed on one side between the carrier and the base.

3. The lens driving device as described in claim 2, characterized in that, The drive mechanism is located between the two guide ball grooves.

4. The lens driving device as described in claim 1, characterized in that, The bottom of the second ball groove is provided with a bottom protrusion; The lens driving device also includes a housing, which covers the outside of the base and has a hollow cavity between it and the base. The carrier and the driving mechanism are both disposed in the hollow cavity. The bottom of the housing is provided with a top protrusion, which is located above the guide ball groove.

5. The lens driving device as described in claim 4, characterized in that, The top protrusion is formed by the downward indentation of the end wall of the outer shell.

6. The lens driving device according to any one of claims 1 to 5, characterized in that, The driving mechanism adopts a piezoelectric mechanism, which includes a piezoelectric block and a friction rod. The piezoelectric block is mounted on the base, and the friction rod is connected to the piezoelectric block. The friction rod abuts against the carrier. When the piezoelectric block is energized and deformed, the friction rod drives the carrier to move longitudinally.

7. The lens driving device as described in claim 6, characterized in that, The carrier has an installation groove on its outer side wall, and spring connection points are provided on the outer side wall of the carrier on both sides of the installation groove. The base is provided with a mounting protrusion, which is located in the mounting groove. A friction rod mounting groove is provided on the outer wall of the mounting protrusion, and the friction rod is located in the friction rod mounting groove. The piezoelectric mechanism also includes a spring, the two ends of which are respectively connected to the spring connection points on both sides of the mounting groove. The friction rod is located between the spring and the friction rod mounting groove, and the outer wall of the friction rod abuts against the spring. When the piezoelectric block is energized and deformed, the friction rod drives the spring and the carrier to move longitudinally.

8. The lens driving device as described in claim 6, characterized in that, The piezoelectric mechanism also includes a counterweight plate, and the piezoelectric block is mounted on the counterweight plate. Both the counterweight plate and the piezoelectric block are mounted in the piezoelectric mechanism mounting groove provided at the bottom of the base.

9. The lens driving device as described in claim 6, characterized in that, The lens driving device also includes a circuit board that surrounds the outside of the base, and the end of the circuit board supplies power to the piezoelectric block through the base's built-in circuitry.

10. The lens driving device as claimed in claim 9, characterized in that, A control chip is provided on the inner side of the circuit board. The control chip is located in the clearance notch on the side wall of the base. The control chip is used to control the energization state of the piezoelectric block. And / or, a position sensor is provided on the inner side of the circuit board, and a sensing magnet is provided on the carrier, with the sensing magnet and the position sensor being arranged opposite each other; a clearance groove is provided on the base, and the clearance groove is located between the sensing magnet and the position sensor; And / or, the circuit board is an FPC board.

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