Piezoelectric rotation driving structure

Abstract

The utility model discloses a piezoelectric rotation driving structure, which comprises a shell base and a movable drive plate, and the shell base is provided with a base light through hole; the shell base is provided with an annular groove which is located below the movable drive plate and is in an annular shape, and the annular groove is provided with an opening facing the movable drive plate and surrounds the peripheral side of the base light through hole. The piezoelectric rotation driving structure further comprises an ultrasonic motor assembly, and the ultrasonic motor assembly is embedded in the annular groove of the shell base. The ultrasonic motor assembly comprises a friction plate, an elastic metal piece and a piezoelectric ceramic piece which are in a circular ring shape and are sequentially arranged from top to bottom, the friction plate is attached to the lower surface of the movable drive plate, the piezoelectric ceramic piece is attached to the lower surface of the elastic metal piece, and the friction plate makes contact with the elastic metal piece. By means of the structural design, the diaphragm control device has the advantages of being novel in structural design and good in structural compactness, and the diaphragm control precision can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of apertures, in particular to a piezoelectric rotation driving structure. Background Art

[0002] The aperture is a device used to control the amount of light that passes through the lens and enters the photosensitive surface inside the camera body. For a lens that has already been manufactured, it is impossible to change the diameter of the lens at will, but it is possible to control the amount of light passing through the lens by adding a polygonal or circular aperture stop with a variable area inside the lens. This device is called an aperture.

[0003] The patent number is: ZL202320133625.X, and the patent name is: A Chinese utility model patent for an iris aperture, which specifically discloses the following technical solutions, specifically: an iris aperture, including a shell, a motor, a dial, a transmission mechanism and a blade group, the motor is tightly mounted on the shell, the dial is relatively rotatably mounted in the inner cavity of the shell, and the motor is driven and connected to the dial through a transmission mechanism; a plurality of levers are provided on the dial, a plurality of fixed pins are provided on the shell, the blade group has a plurality of blades, each blade is rotatably mounted on a fixed pin, and a guide slot is provided on each blade, each lever extends into the guide slot of a blade to drive the blade to rotate around the fixed pin; wherein, the transmission mechanism includes an output gear, a first transmission gear and a second transmission gear, the dial is provided with external teeth, the output gear is mounted on the output shaft of the motor, and the output gear, the first transmission gear, the second transmission gear and the dial are meshed in sequence to realize gear transmission connection.

[0004] For the above-mentioned iris aperture, when the motor is working, after being energized, the output gear installed on the output shaft of the motor drives the first transmission gear meshing with the output gear to rotate, the rotation of the first transmission gear drives the rotation of the second transmission gear coaxially installed therewith, the rotation of the second transmission gear drives the rotation of the outer teeth on the dial, and then drives the rotation of the dial, the rotation of the dial drives the rotation of the lever, the rotation of the lever drives the blades, so that each blade rotates with the fixed pin shaft on which the blade is installed as the center of the circle, thereby changing the size of the aperture and adjusting the amount of light.

[0005] It should be pointed out that the above-mentioned iris aperture has the following defects, specifically:

[0006] Defect 1. The dial is driven by a motor and a transmission mechanism, and the transmission mechanism includes a number of gear structures. The dial drive assembly has a complex structure and poor compactness;

[0007] Defect 2: For the gear transmission structure composed of the output gear, the first transmission gear, the second transmission gear and the outer teeth of the dial, since the gear transmission method inevitably has gear meshing clearance, this will cause the problem of low aperture control accuracy. Utility Model Content

[0008] The utility model aims to provide a piezoelectric rotary drive structure to address the deficiencies of the prior art. The piezoelectric rotary drive structure has a novel design and good compactness and can effectively improve the aperture control accuracy.

[0009] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions.

[0010] A piezoelectric rotary drive structure comprises a housing base, a movable dial rotatably mounted on the housing base and used to drive the aperture blades to rotate, and the housing base is provided with a base light-through hole located below the movable dial;

[0011] The housing base is provided with a circular annular groove located below the movable dial, the annular groove opens toward the movable dial side and surrounds the peripheral side of the light-through hole of the base;

[0012] The piezoelectric rotary drive structure also includes an ultrasonic motor component, which is embedded in the annular groove of the housing base;

[0013] The ultrasonic motor assembly includes a friction plate, an elastic metal part, and a piezoelectric ceramic part, which are respectively in the shape of an annulus and arranged in sequence from top to bottom. The friction plate is in contact with the lower surface of the movable dial, the piezoelectric ceramic part is in contact with the lower surface of the elastic metal part, and the friction plate is in contact with the elastic metal part.

[0014] The movable dial is in the shape of a ring, and the outer circumferential surface of the movable dial is provided with a plurality of dial protrusions distributed in a ring array and protruding radially outwards;

[0015] The housing base is provided with a dial mounting hole having an inner diameter equal to an outer diameter of the movable dial, the annular groove is provided on the bottom surface of the dial mounting hole, the dial mounting hole is axially aligned with and connected to the light-through hole of the base, and the movable dial is rotatably mounted on the dial mounting hole;

[0016] The inner wall of the dial installation hole is provided with a limiting annular groove which is open inwards and in a circular ring shape, and each dial convex part of the movable dial is respectively inserted into the limiting annular groove.

[0017] Wherein, the inner wall of the dial installation hole is respectively provided with a clearance groove corresponding to each of the dial protrusions, which is open upward and communicated with the limiting annular groove.

[0018] Wherein, a notch is provided at the lower end of the housing base, the notch opening outward and communicating with the annular groove;

[0019] The piezoelectric rotary drive structure also includes an FPC circuit board that passes through the notch of the housing base and extends into the annular groove. The FPC circuit board is electrically connected to the piezoelectric ceramic component.

[0020] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0021] 1. The driving part of the movable dial of the utility model is only composed of a friction plate, an elastic metal part, and a piezoelectric ceramic part; compared with the motor and gear transmission structure in the prior art, the driving part of the movable dial of the utility model has a simpler structure;

[0022] 2. The ultrasonic motor assembly is embedded in the annular groove of the housing base, and the annular groove is located on the peripheral side of the light-through hole of the base. The above-mentioned ultrasonic motor assembly installation structure design can effectively utilize the thickness space of the housing base, thereby making the overall structure more compact;

[0023] 3. The movable dial of the utility model is driven by an ultrasonic motor assembly. Compared with the motor-gear transmission mechanism in the prior art, the utility model does not have the problem of gear meshing transmission gap, that is, it can effectively ensure the aperture control accuracy;

[0024] 4. Therefore, the piezoelectric rotary drive structure of the utility model has the advantages of novel structural design and good compactness, and can effectively improve the aperture control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] Figure 2 This is an exploded view of the utility model.

[0028] Figure 3 It is a cross-sectional schematic diagram of the utility model.

[0029] Figure 4 It is a structural schematic diagram of the base of the utility model.

[0030] exist Figures 1 to 4 Included are:

[0031] 1-housing base; 11-base light hole; 12-annular groove; 13-limiting annular groove; 14-avoiding groove; 15-notch; 2-movable dial; 21-dial convex part; 3-ultrasonic motor assembly; 31-friction plate; 32-elastic metal part; 33-piezoelectric ceramic part; 4-FPC circuit board. DETAILED DESCRIPTION

[0032] The present invention will be described below in conjunction with specific implementation methods.

[0033] Embodiment 1, as Figures 1 to 4 As shown, a piezoelectric rotary drive structure includes a housing base 1, a movable dial 2 rotatably mounted on the housing base 1 and used to drive the aperture blades to rotate, and the housing base 1 is provided with a base light hole 11 located below the movable dial 2.

[0034] Among them, Figures 2 to 4 As shown, the housing base 1 is provided with a circular annular groove 12 located below the movable dial 2 . The circular annular groove 12 opens toward the movable dial 2 and surrounds the circumference of the base light hole 11 .

[0035] Further, such as Figure 2 and Figure 3 As shown, the piezoelectric rotary drive structure further includes an ultrasonic motor component 3 , which is embedded in the annular groove 12 of the housing base 1 .

[0036] Furthermore, Figure 2 and Figure 3 As shown, the ultrasonic motor assembly 3 includes a friction plate 31, an elastic metal part 32, and a piezoelectric ceramic part 33, which are respectively in the shape of circular rings and arranged in sequence from top to bottom. The friction plate 31 is in contact with the lower surface of the movable dial 2, the piezoelectric ceramic part 33 is in contact with the lower surface of the elastic metal part 32, and the friction plate 31 is in contact with the elastic metal part 32.

[0037] It should be pointed out that the movable dial 2, friction plate 31, elastic metal part 32, and piezoelectric ceramic sheet of the first embodiment constitute an ultrasonic motor assembly, the movable dial 2 and friction plate 31 constitute the moving body part of the ultrasonic motor assembly, and the elastic metal part 32 and piezoelectric ceramic part 33 constitute the vibrating body part of the ultrasonic motor assembly.

[0038] In addition, for the piezoelectric rotary drive structure of the first embodiment, as a part of the light source device, when working, the ultrasonic motor assembly 3 of the first embodiment drives the movable dial 2 to rotate, and the rotating movable dial 2 drives the aperture blades to rotate to realize the control of the aperture light hole size.

[0039] It should be emphasized that the driving part of the movable dial 2 of the first embodiment is only composed of the friction plate 31, the elastic metal part 32, and the piezoelectric ceramic part 33; compared with the motor and gear transmission structure in the prior art, the driving part of the movable dial 2 of the first embodiment is simpler in structure.

[0040] In addition, the ultrasonic motor assembly 3 of the first embodiment is embedded in the annular groove 12 of the outer shell base 1, and the annular groove 12 is located on the peripheral side of the base light hole 11. The above-mentioned ultrasonic motor assembly 3 installation structure design can effectively utilize the thickness space of the outer shell base 1, thereby making the overall structure more compact.

[0041] It should be further emphasized that the movable dial 2 of the first embodiment is driven by the ultrasonic motor assembly. Compared with the motor-gear transmission mechanism in the prior art, the first embodiment does not have the problem of gear meshing transmission clearance, that is, it can effectively ensure the aperture control accuracy.

[0042] In summary, it can be seen that, through the above structural design, the piezoelectric rotation drive structure of the first embodiment has the advantages of novel structural design and good compactness, and can effectively improve the aperture control accuracy.

[0043] Embodiment 2, as Figures 2 to 4 As shown, the difference between the second embodiment and the first embodiment is that the movable dial 2 is in a circular ring shape, and the outer circumferential surface of the movable dial 2 is provided with a plurality of dial protrusions 21 distributed in a circular array and protruding radially outwards.

[0044] Among them, the shell base 1 is provided with a dial mounting hole whose inner diameter value is equal to the outer diameter value of the movable dial 2, the annular groove 12 is provided on the bottom surface of the dial mounting hole, the dial mounting hole is axially aligned and connected with the base light hole 11, and the movable dial 2 is rotatably installed in the dial mounting hole.

[0045] In addition, the inner wall of the dial installation hole is provided with a limiting annular groove 13 which is open inwards and in a circular ring shape, and each dial protrusion 21 of the movable dial 2 is inserted into the limiting annular groove 13 respectively.

[0046] For the above-mentioned movable dial 2 installation structure, by matching the dial protrusion 21 of the movable dial 2 with the limiting annular groove 13 of the housing base 1, the second embodiment can ensure that the movable dial 2 is stably and reliably rotatably installed in the dial installation hole of the housing base 1.

[0047] Embodiment three, as Figure 2 and Figure 4 As shown, the difference between the third embodiment and the second embodiment is that the inner wall of the dial mounting hole is respectively provided with a clearance groove 14 corresponding to each dial protrusion 21 and opening upward and communicating with the limiting annular groove 13 .

[0048] When installing the movable dial 2 in the dial installation hole of the housing base 1, firstly align each dial protrusion 21 of the movable dial 2 with the corresponding avoidance groove 14, and then make each dial protrusion 21 of the movable dial 2 pass through the corresponding avoidance groove 14 from top to bottom, so that each dial protrusion 21 of the movable dial 2 can be smoothly inserted into the limiting annular groove 13 of the housing base 1.

[0049] Embodiment 4, as Figures 1 to 3 As shown, the difference between the fourth embodiment and the first embodiment is that a notch 15 opening outward and communicating with the annular groove 12 is formed at the lower end of the housing base 1 .

[0050] The piezoelectric rotary drive structure further includes an FPC circuit board 4 that passes through the notch 15 of the housing base 1 and extends into the annular groove 12 . The FPC circuit board 4 is electrically connected to the piezoelectric ceramic component 33 .

[0051] It should be explained that the FPC circuit board 4 is a flexible structure, and the FPC circuit board 4 with this flexible structure can smoothly pass through the notch 15 of the housing base 1, which is convenient for installation.

[0052] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A piezoelectric rotary drive structure, comprising a housing base (1), a movable dial (2) rotatably mounted on the housing base (1) and used to drive the aperture blades to rotate, the housing base (1) being provided with a base light-through hole (11) located below the movable dial (2); Features: The housing base (1) is provided with a circular annular groove (12) located below the movable dial (2); the circular annular groove (12) is open toward the movable dial (2) and surrounds the circumference of the base light hole (11); The piezoelectric rotary drive structure also includes an ultrasonic motor component (3), which is embedded in an annular groove (12) of the housing base (1); The ultrasonic motor assembly (3) comprises a friction plate (31), an elastic metal part (32), and a piezoelectric ceramic part (33) which are respectively in the shape of an annulus and are arranged in sequence from top to bottom. The friction plate (31) is in contact with the lower surface of the movable dial (2), the piezoelectric ceramic part (33) is in contact with the lower surface of the elastic metal part (32), and the friction plate (31) is in contact with the elastic metal part (32).

2. A piezoelectric rotary drive structure according to claim 1, characterized in that: The movable dial (2) is in the shape of a circular ring, and the outer circumferential surface of the movable dial (2) is provided with a plurality of dial protrusions (21) distributed in a circular array and protruding radially outwards respectively; The housing base (1) is provided with a dial mounting hole having an inner diameter equal to the outer diameter of the movable dial (2); the annular groove (12) is provided on the bottom surface of the dial mounting hole; the dial mounting hole is axially aligned with and connected to the base light through hole (11); and the movable dial (2) is rotatably mounted on the dial mounting hole; The inner wall of the dial installation hole is provided with a limiting annular groove (13) which is open inwards and in the shape of a circular ring, and each dial protrusion (21) of the movable dial (2) is respectively inserted into the limiting annular groove (13).

3. A piezoelectric rotary drive structure according to claim 2, characterized in that: The inner wall of the dial mounting hole is provided with a clearance groove (14) corresponding to each of the dial protrusions (21) and opening upward and communicating with the limiting annular groove (13).

4. The piezoelectric rotary drive structure according to claim 1, characterized in that: A notch (15) is formed at the lower end of the housing base (1) and is open outwards and communicates with the annular groove (12); The piezoelectric rotary drive structure also includes an FPC circuit board (4) that passes through the notch (15) of the housing base (1) and extends into the annular groove (12); the FPC circuit board (4) is electrically connected to the piezoelectric ceramic component (33).

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