Lens drive device

Abstract

The present invention discloses a lens drive device, comprising a base, a first carrier, a second carrier, a first piezoelectric drive mechanism, and a second piezoelectric drive mechanism. The first carrier is slidably connected to the base via a first guide member, and the second carrier is slidably connected to the first carrier via a second guide member. The first piezoelectric drive mechanism comprises a first friction member and a first piezoelectric deformer, and the second piezoelectric drive mechanism comprises a second friction member and a second piezoelectric deformer. The first friction member is fixed in a first fixing groove via a first clamping member, and the second friction member is fixed in a second fixing groove via a second clamping member. The first piezoelectric deformer is arranged at the rear end of the first friction member and drives the first carrier to move in a first direction when power is applied, and the second piezoelectric deformer is arranged at the rear end of the second friction member and drives the second carrier to move in a second direction when power is applied. The present invention has the beneficial technical effects of being compact in structure, saving installation space, and having a wide range of application scenarios.

Description

Technical Field

[0001] The present invention relates to the field of optics, and in particular to a lens driving device. Background Art

[0002] The motor that drives the lens is typically installed within the phone's camera module and is typically driven by an electromagnetic combination of magnets and coils, generating a magnetic field that interferes with other electronic components within the phone. Furthermore, auxiliary components such as suspension wires and springs are often used, which are inherently susceptible to metal fatigue and can cause irreversible deformation such as metal deformation after impact. Summary of the Invention

[0003] The object of the present invention is to provide a lens driving device to solve the above problems in the prior art.

[0004] In order to solve the above problems, according to one aspect of the present invention, a lens driving device is provided, characterized in that the lens driving device comprises a driving mechanism and a second piezoelectric driving mechanism, the base is provided with a chamber, the first carrier is arranged in the chamber and is slidably connected to the base through a first guide member, the second carrier is arranged above the first carrier and is slidably connected to the first carrier through a second guide member,

[0005] A first fixing groove is provided in the cavity of the base, and a second fixing groove is provided at the bottom of the second carrier. The first piezoelectric driving mechanism includes a first friction member and a first piezoelectric deformer. The second piezoelectric driving mechanism includes a second friction member and a second piezoelectric deformer. The first friction member is fixed in the first fixing groove by a first clamping member, and the second friction member is fixed in the second fixing groove by a second clamping member. The first piezoelectric deformer is arranged at the rear end of the first friction member and drives the first friction member to move when power is supplied to drive the first carrier to move in a first direction. The second piezoelectric deformer is arranged at the rear end of the second friction member and drives the second friction member to move when power is supplied to drive the second carrier to move in a second direction perpendicular to the first direction.

[0006] In one embodiment, first guide holes are provided at both ends of the first carrier, the first guide member passes through the first guide hole and is fixedly connected to the base at both ends, and second guide holes are provided at the bottom of the second carrier, the second guide member passes through the second guide hole and is fixedly connected to the first carrier at both ends.

[0007] In one embodiment, the first carrier has a first surface facing the base and a second surface facing the second carrier, the second surface is provided with an "L"-shaped protrusion protruding toward the second carrier, the "L"-shaped protrusion includes a first protrusion and a second protrusion perpendicular to each other, the first protrusion is provided with a first piezoelectric mounting groove for installing a first piezoelectric deformer, and the second protrusion is provided with a second piezoelectric mounting groove for installing a second piezoelectric deformer.

[0008] In one embodiment, a first stop portion is provided at the rear of the first piezoelectric mounting groove, one end of the first friction member is in contact with the first piezoelectric deformer, and the other end of the first friction member is against the first stop portion, and a second stop portion is provided at the rear of the second piezoelectric mounting groove, one end of the second friction member is in contact with the second piezoelectric deformer, and the other end of the second friction member is against the second stop portion.

[0009] In one embodiment, the first piezoelectric drive mechanism further includes a first counterweight, and the second piezoelectric drive mechanism further includes a second counterweight, the first counterweight is fixedly disposed behind the first piezoelectric deformer, and the second counterweight is fixedly disposed behind the second piezoelectric deformer; preferably, the first counterweight is fixed to the first carrier via a first mounting plate, and the second counterweight is fixed to the first carrier via a second mounting plate; preferably, the first counterweight and the second counterweight are disposed on the inner side of the "L"-shaped protrusion.

[0010] In one embodiment, the bottom of the chamber of the base is provided with two first drive baffles protruding upward, and the first fixing groove is formed between the two first drive baffles; and the bottom of the second carrier is provided with two second drive baffles protruding toward the first carrier, and the second fixing groove is formed between the two second drive baffles.

[0011] In one embodiment, a first driving baffle avoidance groove is provided on the outer side of the first protruding block, and the first driving baffle extends into the first driving baffle avoidance groove.

[0012] In one embodiment, the lens driving device further includes a driving circuit board, and the driving circuit board is electrically connected to the first piezoelectric deformer and the second piezoelectric deformer.

[0013] In one embodiment, the mechanism driving mechanism further includes an induction circuit board, which is arranged at the bottom of the second carrier and is provided with a first position sensor and a second position sensor, and the base is provided with an induction magnet corresponding to the first position sensor and the second position sensor to detect the displacement of the second carrier.

[0014] In one embodiment, the lens driving device further includes a motor module, and the motor module is fixedly connected to the second carrier.

[0015] The present invention completely abandons the traditional electromagnetic drive method and instead adopts a new piezoelectric drive method to realize the movement of the lens in three directions, thereby realizing the autofocus (AF) function along the optical axis direction, and the optical image stabilization (OIS) function along the first direction and the second direction perpendicular to the optical axis direction. It has reliable performance, high stability, extremely high commercial utilization value and broad commercial application scenarios.

[0016] In addition, the present invention also makes the entire lens driving device have the beneficial technical effects of compact structure, saving installation space, and wide range of usage scenarios through the clever arrangement of the first piezoelectric driving mechanism and the second piezoelectric driving mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective exploded view of a lens driving device according to an embodiment of the present invention.

[0018] Figure 2 It is a three-dimensional diagram of a first carrier according to an embodiment of the present invention.

[0019] Figure 3 It is a three-dimensional diagram of a second carrier according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the present invention can be more clearly understood. 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.

[0021] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0022] Reference throughout this specification to "one embodiment" or "an embodiment" means 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 this 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.

[0023] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0024] The present application generally relates to a lens driving device, which can be used in terminal products such as mobile phones and tablet computers to cooperate with lenses to achieve functions such as taking pictures and recording videos.

[0025] Figure 1 FIG. 1 is a perspective exploded view of a lens driving device 100 according to an embodiment of the present invention. Figure 1 As shown, the lens driving device 100 includes a base 10, a first carrier 20, a second carrier 30, a first piezoelectric driving mechanism 40, and a second piezoelectric driving mechanism 50. The base 10 has a chamber 11. The first carrier 20 is disposed within the chamber 11 and is slidably connected to the base 10 via a first guide 61. The second carrier 30 is disposed above the first carrier 20 and is slidably connected to the first carrier 20 via a second guide 62. A first fixing groove 12 is defined within the chamber 11 of the base 10, and a second fixing groove 32 is defined at the bottom of the second carrier 30. The first piezoelectric driving mechanism 40 includes a first friction member 41 and a first piezoelectric deforming member 42. The second piezoelectric driving mechanism 50 includes a second friction member 51 and a second piezoelectric deforming member 52. The first friction member 41 is secured to the first fixing groove 12 via a first clamping member, and the second friction member 51 is secured to the second fixing groove 32 via a second clamping member. The first piezoelectric deformer 42 is disposed at the rear end of the first friction member 41 and drives the first friction member 41 to move when power is supplied to drive the first carrier 20 to move in a first direction, and the second piezoelectric deformer 52 is disposed at the rear end of the second friction member 51 and drives the second friction member 51 to move when power is supplied to drive the second carrier 30 to move in a second direction perpendicular to the first direction.

[0026] In one embodiment, the piezoelectric drive mechanism of the present invention may further include a piezoelectric module 70, which is fixedly connected to the upper end of the second carrier 30 and can move in a third direction perpendicular to the first and second directions. For example, if the first direction is defined as the X-axis direction and the second direction is defined as the Y-axis direction, the piezoelectric module 70 can move in the Z-axis direction, which is perpendicular to both the X-axis direction and the Y-axis direction. When the first piezoelectric drive mechanism 40 is operating, the first carrier 20 and the second carrier 30 move together in the X-axis direction. When the second piezoelectric drive mechanism 50 is operating, the second carrier moves alone in the Y-axis direction, cooperating with the Z-axis movement operation of the piezoelectric module 70, so that the lens (not shown) disposed in the piezoelectric module 70 can achieve movement in the X-axis, Y-axis, and Z-axis directions, thereby achieving optical image stabilization and optical zoom functions.

[0027] Figure 2 is a perspective view of a first carrier 20 according to an embodiment of the present invention. Figure 3 FIG is a perspective view of the second carrier 30 according to an embodiment of the present invention. Figure 2-3 As shown, first guide holes 21 are provided at both ends of the first carrier 20, and a first guide member 61 passes through the first guide hole 21 and is fixedly connected to the base 10 at both ends, so that the first carrier 20 is suspended in the base 10 by the first guide member 61 and can move along a first direction relative to the base 10. Similarly, a second guide hole 31 is provided at the bottom of the second carrier 30, and a second guide member 62 passes through the second guide hole 31 and is fixedly connected to the first carrier 20 at both ends, so that the second carrier 30 is slidably connected to the first carrier 20 through the second guide member 62. Since the first guide member 61 and the second guide member 62 are arranged vertically, when the first piezoelectric driving mechanism 40 drives the first carrier 20 to move relative to the base 10 in the first direction, the second carrier 30 and the first carrier 20 are relatively stationary, that is, the second carrier 30 and the first carrier 20 move together relative to the base 10 and have the same displacement, and when the second piezoelectric driving mechanism 50 drives the second carrier 30 to move, the second carrier 30 moves relative to the first carrier 20 in the second direction, and the first carrier 20 and the base 10 remain relatively stationary, that is, the second carrier 30 has the same displacement relative to the first carrier 20 and the base 10.

[0028] like Figure 2 As shown, in one embodiment, the first carrier 20 has a first surface 20A facing the base 10 and a second surface 20B facing the second carrier 30, and the second surface 20B is provided with an "L"-shaped protrusion 22 protruding toward the second carrier 30. The "L"-shaped protrusion 22 includes a first protrusion 221 and a second protrusion 222 that are perpendicular to each other. The first protrusion 221 is provided with a first piezoelectric mounting groove 223 for mounting the first piezoelectric deformer 42, and the second protrusion 222 is provided with a second piezoelectric mounting groove 224 for mounting the second piezoelectric deformer 52.

[0029] In one embodiment, a first stopper 23 is provided behind the first piezoelectric mounting slot 223. One end of a first friction member 41 contacts the first piezoelectric deformer 42, while the other end of the first friction member 41 abuts the first stopper 23. When the first piezoelectric deformer 42 is energized and vibrates, the first friction member 41 is driven to move in a direction opposite to the first stopper 23, thereby driving the first carrier 20 to move. Similarly, a second stopper 24 is provided behind the second piezoelectric mounting slot 224. One end of a second friction member 51 contacts the second piezoelectric deformer 52, while the other end of the second friction member 51 abuts the second stopper 24. When the second piezoelectric deformer 52 is energized and vibrates, the second friction member 51 is driven to move in a direction opposite to the second stopper 24, thereby driving the second carrier 30 to move.

[0030] Return to reference Figure 1 In one embodiment, the first piezoelectric drive mechanism 40 further includes a first counterweight 43, and the second piezoelectric drive mechanism 50 further includes a second counterweight 53. The first counterweight 43 is fixedly disposed behind the first piezoelectric deformer 42, and the second counterweight 53 is fixedly disposed behind the second piezoelectric deformer 52. Preferably, the first counterweight 43 is fixed to the first carrier 20 via a first mounting plate 44, and the second counterweight 53 is fixed to the first carrier 20 via a second mounting plate 54.

[0031] Optionally, the first counterweight 43 and the second counterweight 53 are arranged on the inner side of the "L"-shaped protrusion 22, that is, the first counterweight 43 and the second counterweight 53 are arranged in the semi-enclosed area surrounded by the first protrusion 221 and the second protrusion 222, so as to save space to the maximum extent and reduce the volume occupied by the entire lens driving device.

[0032] Reference Figure 1-3 In one embodiment, the bottom of the chamber 11 of the base 10 is provided with two upwardly protruding first drive baffles 13, with a first fixing slot 12 formed between the two first drive baffles 13. Similarly, the bottom of the second carrier 30 is provided with two second drive baffles 33 protruding toward the first carrier 20, with a second fixing slot 32 formed between the two second drive baffles 33. Optionally, a first drive baffle avoidance slot 25 is provided on the outer side of the first protrusion 221, and the first drive baffle 13 extends into the first drive baffle avoidance slot 25.

[0033] Reference Figure 1 In one embodiment, the lens driving device 100 further includes a driving circuit board 81. The driving circuit board 81 is electrically connected to the first piezoelectric deformer 42 and the second piezoelectric deformer 52, thereby supplying power to the first piezoelectric deformer 42 and the second piezoelectric deformer 52. The driving circuit board 81 can be disposed at a suitable location as needed, for example, between the second carrier 30 and the first carrier 20.

[0034] In one embodiment, the lens driving device may further include an inductive circuit board 82, which is disposed at the bottom of the second carrier 30 and is provided with a first position sensor 821 and a second position sensor 822. The base 10 is provided with an inductive magnet 83 corresponding to the first position sensor 821 and the second position sensor 822 and is used to detect the displacement of the second carrier 30 in the first direction and the second direction.

[0035] It should be noted that the structures shown in the drawings are not necessarily included in one embodiment, that is, one embodiment may include only part of these structures, while another embodiment includes another part of these structures.

[0036] The present invention completely abandons the traditional electromagnetic drive method and instead adopts a new piezoelectric drive method to realize the movement of the lens in three directions, thereby realizing the autofocus (AF) function along the optical axis direction, and the optical image stabilization (OIS) function along the first direction and the second direction perpendicular to the optical axis direction. It has reliable performance, high stability, extremely high commercial utilization value and broad commercial application scenarios.

[0037] In addition, the present invention also makes the entire lens driving device have the beneficial technical effects of compact structure, saving installation space, and wide range of usage scenarios through the clever arrangement of the first piezoelectric driving mechanism and the second piezoelectric driving mechanism.

[0038] While the preferred embodiments of the present invention have been described in detail above, it should be understood that, after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalents also fall within the scope of the claims appended hereto.

Claims

1. A lens driving device, characterized in that: The lens driving device includes a base, a first carrier, a second carrier, a first piezoelectric driving mechanism, and a second piezoelectric driving mechanism. The base is provided with a cavity. The first carrier is arranged in the cavity and is slidably connected to the base through a first guide. The second carrier is arranged above the first carrier and is slidably connected to the first carrier through a second guide. A first fixing groove is provided in the cavity of the base, a second fixing groove is provided at the bottom of the second carrier, the first piezoelectric driving mechanism includes a first friction member and a first piezoelectric deforming member, and the second piezoelectric driving mechanism includes a second friction member and a second piezoelectric deforming member, the first friction member is fixed in the first fixing groove by a first clamping member, and the second friction member is fixed in the second fixing groove by a second clamping member, the first piezoelectric deforming member is arranged at the rear end of the first friction member and drives the first friction member to move when power is supplied to drive the first carrier to move in a first direction, and the second piezoelectric deforming member is arranged at the rear end of the second friction member and drives the second friction member to move when power is supplied to drive the second carrier to move in a second direction perpendicular to the first direction; The lens driving device further includes a piezoelectric module, the piezoelectric module being used to set the lens, the piezoelectric module being fixedly connected to the upper end of the second carrier and being movable along a third direction perpendicular to the first direction and the second direction; The first carrier has a first surface facing the base and a second surface facing the second carrier, the second surface is provided with an "L"-shaped protrusion protruding toward the second carrier, the "L"-shaped protrusion includes a first protrusion and a second protrusion perpendicular to each other, the first protrusion is provided with a first piezoelectric mounting groove for mounting a first piezoelectric deformer, and the second protrusion is provided with a second piezoelectric mounting groove for mounting a second piezoelectric deformer; The first piezoelectric drive mechanism also includes a first counterweight block, and the second piezoelectric drive mechanism also includes a second counterweight block. The first counterweight block is fixedly arranged behind the first piezoelectric deformer, and the second counterweight block is fixedly arranged behind the second piezoelectric deformer; the first counterweight block is fixed to the first carrier through a first mounting plate, and the second counterweight block is fixed to the first carrier through a second mounting plate; the first counterweight block and the second counterweight block are arranged on the inner side of the "L"-shaped protrusion.

2. The lens driving device according to claim 1, wherein: A first guide hole is provided at both ends of the first carrier, the first guide member passes through the first guide hole and is fixedly connected to the base at both ends, and a second guide hole is provided at the bottom of the second carrier, the second guide member passes through the second guide hole and is fixedly connected to the first carrier at both ends.

3. The lens driving device according to claim 1, wherein: A first stop portion is provided at the rear of the first piezoelectric mounting groove, one end of the first friction member is in contact with the first piezoelectric deformer, and the other end of the first friction member is against the first stop portion, and a second stop portion is provided at the rear of the second piezoelectric mounting groove, one end of the second friction member is in contact with the second piezoelectric deformer, and the other end of the second friction member is against the second stop portion.

4. The lens driving device according to claim 1, wherein: The bottom of the cavity of the base is provided with two first drive baffles protruding upward, and the first fixing groove is formed between the two first drive baffles; and the bottom of the second carrier is provided with two second drive baffles protruding toward the first carrier, and the second fixing groove is formed between the two second drive baffles.

5. The lens driving device according to claim 4, wherein: A first driving baffle avoidance groove is provided on the outer side of the first protrusion, and the first driving baffle extends into the first driving baffle avoidance groove.

6. The lens driving device according to claim 1, wherein: The lens driving device further includes a driving circuit board electrically connected to the first piezoelectric deformer and the second piezoelectric deformer.

7. The lens driving device according to claim 1, wherein: The lens driving device also includes an inductive circuit board, which is arranged at the bottom of the second carrier and is provided with a first position sensor and a second position sensor. The base is provided with an inductive magnet corresponding to the first position sensor and the second position sensor to detect the displacement of the second carrier.

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