Piezoelectric drive device

Abstract

The present invention belongs to the technical field of optical components, and specifically relates to a piezoelectric drive device, including a housing, a base, a piezoelectric mechanism and a carrier, wherein a hollow cavity is provided between the housing and the base, and the piezoelectric mechanism and the carrier are arranged in the hollow cavity; the carrier is arranged in the base, and a piezoelectric mechanism is arranged between an end angle position of the carrier and the base; inner wall protrusions are respectively arranged at a pair of diagonal positions on the inner wall of the base, and a spring is arranged between the top of the carrier and the top of the inner wall protrusion. A spring is installed between the top of the inner wall protrusion and the top of the carrier in the present invention, which is used to assist the reset operation of the carrier after the longitudinal movement, so that the autofocus operation is more stable and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of optical components, and in particular relates to a piezoelectric drive device. 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. The use of these electronic devices is becoming more and more common, and they are developing in the direction of convenient and thin 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 an optical component such as a lens to move, thereby achieving an autofocus function. Light can pass through the optical component to form an image on the photosensitive component.

[0004] In order to realize the autofocus function, the smooth impact drive mechanism (SIDM) came into being. SIDM is a drive mechanism that uses piezoelectric elements to drive the carrier with the lens to move to achieve the purpose of autofocus.

[0005] With the popularization of terminals such as smart phones, how to simplify the piezoelectric drive device and enable the piezoelectric drive device to achieve a stable autofocus function is something that technical personnel in this field need to actively consider. Summary of the invention

[0006] The present invention aims to solve the above-mentioned technical problems and provides a piezoelectric driving device.

[0007] A piezoelectric drive device comprises a housing, a base, a piezoelectric mechanism and a carrier, wherein a hollow cavity is provided between the housing and the base, and the piezoelectric mechanism and the carrier are arranged in the hollow cavity;

[0008] The carrier is arranged in the base, and the piezoelectric mechanism is arranged between an end angle position of the carrier and the base;

[0009] Inner wall protrusions are respectively arranged at a pair of diagonal positions on the inner wall of the base, and a spring sheet is arranged between the top of the carrier and the top of the inner wall protrusion.

[0010] Optionally, the piezoelectric mechanism is arranged at an end angle position away from the inner wall protrusion.

[0011] Optionally, the piezoelectric mechanism comprises:

[0012] A piezoelectric element is fixed to the bottom end of the base and has a connection groove on one side;

[0013] The friction member has a top end fixedly connected to an end angle position of the carrier, and a side wall in contact with the connection groove.

[0014] Optionally, a friction member mounting hole is provided at an end angle position of the carrier, and the top end of the friction member is fixedly connected in the friction member mounting hole.

[0015] Optionally, a friction member guide hole is provided at the inner bottom end of the base, and the bottom end of the friction member can be telescoped in the friction member guide hole.

[0016] Optionally, a piezoelectric element mounting groove is provided at the bottom end of the base, and the piezoelectric element is arranged in the piezoelectric element mounting groove.

[0017] Optionally, a base built-in metal is provided in the base, the bottom end of the base built-in metal is connected to an external circuit, and the top end of the base built-in metal is connected to the piezoelectric element.

[0018] Optionally, the piezoelectric mechanism comprises:

[0019] A piezoelectric element is fixed at the bottom end of an end angle position of the carrier and is provided with a connection groove on one side;

[0020] A friction member is fixed between the base and the shell, and a side wall of the friction member is in contact with the connection groove.

[0021] Optionally, a friction member mounting hole is provided on the housing, and a friction member avoidance groove is provided on the carrier;

[0022] The bottom end of the friction member is fixedly connected to the inner bottom end of the base, the friction member passes through the friction member avoidance groove, and the top end of the friction member is fixedly connected to the friction member mounting hole.

[0023] Optionally, a base built-in metal is provided in the base, the bottom end of the base built-in metal is connected to an external circuit, and the top end of the base built-in metal is provided on the top end surface of the inner wall protrusion;

[0024] The carrier is provided with a carrier built-in metal, and the bottom end of the carrier built-in metal is connected to the piezoelectric element;

[0025] One end of the reed is connected to the top end of the built-in metal of the base, and the other end of the reed is connected to the top end of the built-in metal of the carrier.

[0026] Optionally, the piezoelectric element is a piezoelectric block.

[0027] Optionally, the friction member is a friction rod.

[0028] Optionally, a mounting protrusion is provided on one side of the carrier;

[0029] The piezoelectric mechanism also includes:

[0030] The spring sheet has one end fixedly connected to the mounting protrusion and the other end abutting against the outer side of the friction member, so that the friction member is located between the connecting groove and the other end of the spring sheet.

[0031] Beneficial effects: The present invention has at least one or more of the following advantages:

[0032] 1. A spring is installed between the top of the inner wall protrusion and the top of the carrier in the present invention to assist the resetting operation of the carrier after the longitudinal movement, so that the automatic focusing operation is more stable and reliable.

[0033] 2. The present invention improves the positional relationship between the piezoelectric element, the friction member and the spring in the piezoelectric mechanism, so that the overall structure of the piezoelectric mechanism is simple and easy to install and maintain without affecting the autofocus function. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an exploded view of the structure of Embodiment 1 of the present invention;

[0035] Figure 2 for Figure 1 Further exploded diagram of;

[0036] Figure 3 for Figure 2 Further exploded diagram of;

[0037] Figure 4 is a positional relationship diagram between the piezoelectric mechanism and the carrier in Example 1;

[0038] Figure 5 for Figure 4 Partial exploded view;

[0039] Figure 6 This is a positional relationship diagram between the piezoelectric mechanism and the base in Example 1;

[0040] Figure 7 for Figure 6 Exploded diagram of

[0041] Figure 8 An exploded view of the positional relationship between the piezoelectric element and the friction member in Example 1;

[0042] Fig. 9 This is an exploded view of the structure of Embodiment 2 of the present invention;

[0043] Fig.10 for Fig. 9 Further exploded diagram of;

[0044] Fig.11 for Fig.10 Further exploded diagram of;

[0045] Fig.12 is a positional relationship diagram between the piezoelectric mechanism and the carrier in Example 2;

[0046] Fig.13 for Fig.12 A schematic diagram of a partial structure from another angle;

[0047] Fig.14 This is a positional relationship diagram between the friction member and the base in Example 2;

[0048] Fig.15 This is a schematic diagram of the structure of the carrier of Example 2. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, 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.

[0050] In the following description, certain specific details are set forth for the purpose of illustrating the various disclosed embodiments 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 the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0051] 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.

[0052] 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 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.

[0053] Embodiment 1:

[0054] Reference Figures 1 to 8The present embodiment provides a piezoelectric drive device, which includes a housing 1, a base 2, a piezoelectric mechanism 3 and a carrier 4. A hollow cavity is provided between the housing 1 and the base 2. The housing 1 and the base 2 are preferably connected by snapping to form the hollow cavity. The piezoelectric mechanism 3 and the carrier 4 are arranged in the hollow cavity.

[0055] The middle of the housing 1, the base 2 and the carrier 4 is provided with a longitudinally connected lens through hole along the longitudinal direction (i.e., the up-down direction) to accommodate the lens. The lens is installed in the carrier 4, which is arranged in the base 2. A piezoelectric mechanism 3 is arranged between an end angle position of the carrier 4 and the base 2. Under the action of the piezoelectric mechanism 3, the carrier 4 and the lens move longitudinally relative to the base 2 to achieve the zoom effect of the lens.

[0056] Inner wall protrusions 21 are respectively arranged at a pair of diagonal positions on the inner wall of the base 2, and a reed 5 is arranged between the top of the carrier 4 and the top of the inner wall protrusion 21. The reed 5 is used to assist the resetting operation of the carrier 4 after longitudinal movement, so that the autofocus operation is more stable and reliable.

[0057] Since there are two inner wall protrusions 21 , there are also two reed leaves 5 . One end of each reed leaf 5 is connected to the top of a corresponding inner wall protrusion 21 , and the other end is connected to the top of the carrier 4 .

[0058] In one embodiment, the reed 5 adopts an integrated straight sheet structure, and the reed 5 has an elastic connecting piece, and the two ends of the elastic connecting piece are respectively a raised connecting portion and a carrier connecting portion, the raised connecting portion is used to be fixedly connected to the top of the inner wall protrusion 21, and the carrier connecting portion is used to be fixedly connected to the top of the carrier 4.

[0059] In one embodiment, the piezoelectric mechanism 3 is disposed at an end angle position away from the inner wall protrusion 21 .

[0060] Reference Figures 1 to 3 The inner wall protrusion 21 is arranged at the left and right end corner positions of the inner wall protrusion 21, and the piezoelectric mechanism 3 can be arranged at the front end corner position or the rear end corner position.

[0061] In one embodiment, the piezoelectric mechanism 3 includes a piezoelectric element 31 and a friction member 32. The piezoelectric element 31 is fixed to the bottom end of the base 2, and a connection groove 311 is provided on one side of the piezoelectric element 31. The top of the friction member 32 is fixedly connected to an end angle position of the carrier 4, and the side wall of the friction member 32 is in contact with the connection groove 311.

[0062] When the piezoelectric element 31 generates high-frequency vibration after being energized, the vibration causes the friction member 32 to move longitudinally relative to the piezoelectric element 31 , thereby achieving the longitudinal movement of the carrier 4 .

[0063] In one embodiment, a friction member installation hole 41 is provided at an end corner of the carrier 4 , and the top end of the friction member 32 is fixedly connected in the friction member installation hole 41 .

[0064] In one embodiment, a friction member guide hole 22 is provided at the bottom end of the base 2 , and the bottom end of the friction member 32 can be telescopically inserted into the friction member guide hole 22 .

[0065] When the friction member 32 moves longitudinally relative to the piezoelectric element 31 , the bottom end of the friction member 32 can move longitudinally in the friction member guide hole 22 .

[0066] In one embodiment, a piezoelectric element installation groove 23 is disposed at the bottom end of the base 2 , and the piezoelectric element 31 is disposed in the piezoelectric element installation groove 23 .

[0067] In one embodiment, a base built-in metal 24 is disposed in the base 2, the bottom end of the base built-in metal 24 extends out of the base 2 and is connected to an external circuit, and the top end of the base built-in metal 24 is connected to the piezoelectric element 31. The base built-in metal 24 realizes the power supply effect of the piezoelectric element 31.

[0068] In one embodiment, the piezoelectric element 31 is a piezoelectric block.

[0069] In one embodiment, the friction member 32 is a friction rod.

[0070] In one embodiment, a mounting protrusion 42 is disposed on one side of the carrier 4 .

[0071] The piezoelectric mechanism 3 further includes a spring sheet 33, one end of which is fixedly connected to the mounting protrusion 42, and the other end of the spring sheet 33 abuts against the outer side of the friction member 32, so that the friction member 32 is located between the connecting groove 311 and the other end of the spring sheet 33. The elastic force of the spring sheet 33 makes the abutting friction force between the friction member 32 and the connecting groove 311 of the piezoelectric element 31 greater, so that the piezoelectric element 31 has a more stable driving effect on the friction member 32.

[0072] Of course, one side of the carrier 4 may not be provided with the mounting protrusion 42 , and one end of the spring piece 33 may be directly fixedly connected to one side of the carrier 4 .

[0073] Embodiment 2:

[0074] Reference Figures 9 to 15 This embodiment provides a piezoelectric drive device. Compared with the embodiment 1, the piezoelectric element and the friction member in the piezoelectric mechanism 3 are arranged at different positions, and the piezoelectric element is powered in a different manner. The rest of the structure of this embodiment is the same as that of the embodiment 1, and will not be described in detail here.

[0075] The piezoelectric mechanism 3 of this embodiment includes a piezoelectric element 34 and a friction member 35. The piezoelectric element 34 is fixed at the bottom end of an end angle position of the carrier 4. A connecting groove 341 is provided on one side of the piezoelectric element 34. The friction member 35 is fixed between the base 2 and the housing 1, and the side wall of the friction member 35 is in contact with the connecting groove 341.

[0076] Similar to the first embodiment, the high-frequency vibration generated by the piezoelectric element 34 after being energized causes the piezoelectric element 34 to move longitudinally relative to the friction member 35 , thereby achieving the longitudinal movement effect of the carrier 4 .

[0077] In one embodiment, the outer shell 1 is provided with a friction member installation hole 11, and the carrier 4 is provided with a friction member avoidance groove 43. The bottom end of the friction member 35 is fixedly connected to the bottom end of the base 2, the friction member 35 passes through the friction member avoidance groove 43, and the top end of the friction member 35 is fixedly connected to the friction member installation hole 11.

[0078] In one embodiment, a base built-in metal 25 is provided in the base 2, the bottom end of the base built-in metal 25 is connected to the external circuit, and the top end of the base built-in metal 25 is provided on the top end surface of the inner wall protrusion 21. A carrier built-in metal 44 is provided in the carrier 4, and the bottom end of the carrier built-in metal 44 is connected to the piezoelectric element 31. One end of the reed 5 is connected to the top end of the base built-in metal 25, and the other end of the reed 5 is connected to the top end of the carrier built-in metal 44.

[0079] Specifically, the metal contact 25a at the top of the built-in metal 25 of the base is arranged on the top end surface of the inner wall protrusion 21, and the metal contact 44a at the top of the built-in metal 44 of the carrier is arranged on the top end surface of the carrier 4. One end of the reed 5 is connected to the metal contact 25a on the top end surface of the inner wall protrusion 21, and the other end of the reed 5 is connected to the metal contact 44a on the top end surface of the carrier 4.

[0080] In this embodiment, since the piezoelectric element 31 is fixed at the bottom end of an end angle position of the carrier 4, the piezoelectric element 31 is powered by the base built-in metal 25, the spring 5 and the carrier built-in metal 44 in sequence.

[0081] The preferred embodiments of the present invention have been described in detail above, but 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. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A piezoelectric drive device, comprising a housing, a base, a piezoelectric mechanism and a carrier, wherein a hollow cavity is provided between the housing and the base, and the piezoelectric mechanism and the carrier are arranged in the hollow cavity; It is characterized in that The carrier is arranged in the base, the piezoelectric mechanism is arranged between an end angle position of the carrier and the base, the outer contour of the carrier is a rectangular shape, and the end angle position is a corner position of the carrier; A pair of diagonal positions of the inner wall of the base are respectively provided with inner wall protrusions, and a spring sheet is provided between the top of the carrier and the top of the inner wall protrusion; The piezoelectric mechanism comprises: A piezoelectric element is fixed to the bottom end of the base and has a connection groove on one side; A friction member, the top end of which is fixedly connected to an end angle position of the carrier, and the side wall of which is in contact with the connection groove; Or, the piezoelectric mechanism includes: A piezoelectric element is fixed at the bottom end of an end angle position of the carrier and is provided with a connection groove on one side; A friction member is fixed between the base and the shell, and a side wall of the friction member is in contact with the connection groove.

2. The piezoelectric drive device according to claim 1, wherein: A friction member mounting hole is provided at an end angle position of the carrier, and the top end of the friction member is fixedly connected in the friction member mounting hole; And / or, a friction member guide hole is provided at the inner bottom end of the base, and the bottom end of the friction member can be telescopically inserted into the friction member guide hole; And / or, a piezoelectric element installation groove is arranged at the bottom end of the base, and the piezoelectric element is arranged in the piezoelectric element installation groove.

3. The piezoelectric drive device according to claim 1, wherein: The base is provided with a base built-in metal, the bottom end of the base built-in metal is connected to an external circuit, and the top end of the base built-in metal is connected to the piezoelectric element.

4. The piezoelectric drive device according to claim 1, wherein: The outer shell is provided with a friction member mounting hole, and the carrier is provided with a friction member avoidance groove; The bottom end of the friction member is fixedly connected to the inner bottom end of the base, the friction member passes through the friction member avoidance groove, and the top end of the friction member is fixedly connected to the friction member mounting hole.

5. The piezoelectric drive device according to claim 4, characterized in that: The base is provided with a base built-in metal, the bottom end of the base built-in metal is connected to the external circuit, and the top end of the base built-in metal is provided on the top end surface of the inner wall protrusion; The carrier is provided with a carrier built-in metal, and the bottom end of the carrier built-in metal is connected to the piezoelectric element; One end of the reed is connected to the top end of the built-in metal of the base, and the other end of the reed is connected to the top end of the built-in metal of the carrier.

6. The piezoelectric drive device according to any one of claims 1 to 5, characterized in that: The piezoelectric mechanism is arranged at an end angle position away from the inner wall protrusion.

7. The piezoelectric drive device according to any one of claims 1 to 5, characterized in that: The piezoelectric element is a piezoelectric block; And / or, the friction member is a friction rod.

8. The piezoelectric drive device according to any one of claims 1 to 5, characterized in that: A mounting protrusion is provided on one side of the carrier; The piezoelectric mechanism also includes: The spring sheet has one end fixedly connected to the mounting protrusion and the other end abutting against the outer side of the friction member, so that the friction member is located between the connecting groove and the other end of the spring sheet.

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