Linear piezoelectric driving device

Abstract

The utility model discloses a linear piezoelectric driving device, which comprises a base, a moving carrier and a driving assembly, and is characterized in that the inner side wall of the base is provided with a sliding shaft along the axial direction; the movable carrier is connected into the base in a sliding manner through the sliding shaft; the driving assembly is located on one side of the base and abuts against the moving carrier, the driving assembly comprises a linear piezoelectric actuator, a circuit board and a pre-pressing piece, the circuit board is electrically connected to the linear piezoelectric actuator, one end of the pre-pressing piece abuts against the linear piezoelectric actuator, and the other end of the pre-pressing piece is electrically connected to the circuit board. The other end of the pre-pressing piece abuts against the base. The pre-pressing part is a deformation part. The driving device solves the problems that an existing driving device is loud in noise, large in size, prone to being interfered by environmental factors and capable of influencing safe operation and the like, and meanwhile is low in manufacturing cost and suitable for general popularization and industrialization.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical component precision drive technical field especially relates to a linear piezoelectric drive device. BACKGROUND

[0002] With the development of science and technology, driving device gradually tends to miniaturization and quietness, the driving device of the existing small instrument usually adopts step motor drive or electromagnetic drive form, but, step motor noise, big volume, cannot satisfy the micro -device with the quiet demand, electromagnetic drive needs the corresponding setting of magnet and coil, occupies the space, cannot satisfy the small volume demand of micro -device, and electromagnetic drive's normal operation needs to keep stable voltage and current, and environmental factors such as electromagnetic interference can influence its normal operation. SUMMARY

[0003] To overcome the defects in the prior art, the utility model provides a linear piezoelectric drive device, which can solve the problems of large noise and large volume of the driving device in the prior art, and is easily affected by environmental factors such as electromagnetic interference.

[0004] To achieve the above object, the utility model provides a linear piezoelectric drive device, and the specific technical scheme is as follows:

[0005] The linear piezoelectric drive device comprises:

[0006] The inner side wall of the base is provided with a sliding shaft along the axial direction.

[0007] The moving carrier is slidably connected to the inside of the base through the sliding shaft.

[0008] The driving assembly is located on one side of the base and abuts against the moving carrier, and comprises a linear piezoelectric actuator, a circuit board and a preloading piece. The circuit board is electrically connected to the linear piezoelectric actuator. One end of the preloading piece abuts against the linear piezoelectric actuator, and the other end of the preloading piece abuts against the base. The preloading piece is a deformation component.

[0009] Further, the side surface of the moving carrier is provided with a magnet, and the magnet is oppositely adsorbed with the sliding shaft. A sensor is arranged in the base, and the sensor is arranged correspondingly with the magnet.

[0010] Further, the linear piezoelectric actuator comprises an elastic body and a piezoelectric element. The piezoelectric element is at least one piezoelectric ceramic sheet. The piezoelectric ceramic sheet is fixedly connected with the elastic body, and the piezoelectric ceramic sheet and the elastic body are insulated.

[0011] Further, the piezoelectric element is a laminated piezoelectric ceramic, comprising an electrically connecting layer, a piezoelectric ceramic layer and an electrode layer; the electrode layer comprises a first electrode layer and a second electrode layer, the first layer of the piezoelectric element is the electrically connecting layer, and the remaining layers of the piezoelectric element are stacked in the order of the piezoelectric ceramic layer, the first electrode layer, the piezoelectric ceramic layer, the second electrode layer, except the electrically connecting layer, and the last layer of the piezoelectric element is the piezoelectric ceramic layer; the number of the electrically connecting layer is 1, the number of the first electrode layer is N, the number of the second electrode layer is M, and the number of the piezoelectric ceramic layer is N+M+1.

[0012] Further, the elastic body is provided with at least one actuating protrusion abutting against the moving carrier.

[0013] Further, the first electrode layer is divided into four sub-zones, namely a zone, a b zone, a c zone and a d zone, and the b zone and the d zone are in a conductive state; the second electrode layer is also divided into four sub-zones, namely a zone, a b zone, a c zone and a d zone, and the a zone and the c zone are in a conductive state. ， zone, a b ， zone, a c ， zone and a d ， zone, and the a ， zone and the c ， zone are in a conductive state.

[0014] Further, the piezoelectric element further comprises a first conductive electrode electrically connected with the electrode layer; the first conductive electrode is arranged on the side of the piezoelectric ceramic sheet, and the first conductive electrode comprises a first conductive end and a second conductive end; one of the b zone or the d zone of the first electrode layer, and the a zone and the c zone are respectively provided with a first electrically connecting end, and the first electrically connecting end is electrically connected with the first conductive end; one of the a ， zone or the c ， zone of the second electrode layer, the b ， zone, the d ， zone are respectively provided with a second electrically connecting end, and the second electrically connecting end is electrically connected with the second conductive end.

[0015] Further, the piezoelectric element further comprises a second conductive electrode electrically connected with the electrode layer, and the piezoelectric element is provided with a through hole, and the second conductive electrode is embedded in the hole and penetrates through the piezoelectric element; one of the b zone or the d zone in the first electrode layer, and the a zone and the c zone are electrically connected with the second conductive electrode; one of the a ， zone or the c ， zone of the second electrode layer, the b ， zone, the d ， zone are respectively electrically connected with the second conductive electrode.

[0016] Further, a friction plate is fixedly connected to one side of the moving carrier towards the actuating protrusion, and the friction plate abuts against the actuating protrusion.

[0017] Further, the linear piezoelectric actuator is provided with a first flexible pad at two ends, and the linear piezoelectric actuator is arranged in a second groove of the first flexible pad; a second flexible pad is arranged on one side of the linear piezoelectric actuator close to the pre-pressing piece, and used for abutting against the pre-pressing piece.

[0018] Compared with the prior art, the linear piezoelectric driving device provided by the utility model has the advantages that the sliding shaft and the magnet corresponding to the sliding shaft are arranged on the moving carrier, the piezoceramic sheet and the actuating protrusion in the driving assembly are matched with the friction plate, when the driving assembly is electrified, the actuating protrusion abuts against the friction plate, the moving carrier moves along the sliding shaft in the longitudinal direction under the action of the friction force, so as to drive the lens or the infrared device to move, the structure has good mute effect, the base is a hollow structure and is provided with a groove in the bottom surface, and can accommodate electronic components, so that the overall volume of the driving device is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an explosion view of the driving device of the utility model;

[0020] Figure 2 It is a position structure display view of the driving assembly of the driving device of the utility model;

[0021] Figure 3 It is a whole structure schematic view of the driving device of the utility model;

[0022] Figure 4 It is a structure schematic view of one embodiment of the actuator of the driving device of the utility model;

[0023] Figure 5 It is a structure schematic view of one elastic body of the actuator of the driving device of the utility model;

[0024] Figure 6 It is an explosion view of the first embodiment of the piezoelectric element of the actuator of the driving device of the utility model;

[0025] Figure 7a It is a schematic view of the first electrode layer in the piezoelectric element; Figure 6

[0026] Figure 7b It is a schematic view of the second electrode layer in the piezoelectric element; Figure 6

[0027] Figure 8a ​​is a first embodiment electric connection diagram of the piezoelectric element of the actuator of the driving device of the utility model;

[0028] Figure 8b is an electrode layer and a conduction end electric connection diagram of the first embodiment piezoelectric element of the actuator of the driving device of the utility model;

[0029] Figure 9a is a first conduction electrode one side diagram of the actuator of the driving device of the utility model;

[0030] Figure 9b is a first conduction electrode other side diagram of the actuator of the driving device of the utility model;

[0031] Figure 10 is a first embodiment overhead view of the piezoelectric element of the actuator of the driving device of the utility model;

[0032] Figure 11 is a second embodiment structure diagram of the piezoelectric element of the actuator of the driving device of the utility model;

[0033] Figure 12a is Figure 11 a first electrode layer diagram;

[0034] Figure 12b is Figure 11 a second electrode layer diagram;

[0035] Figure 13 is a second embodiment electric connection diagram of the piezoelectric element of the actuator of the driving device of the utility model;

[0036] Figure 14 is a second embodiment overhead view of the piezoelectric element of the actuator of the driving device of the utility model except electric connection layer.

[0037] Mark explanation in drawing:

[0038] 1, piezoelectric element;2, actuation protrusion;3, elastomer;4, adjustment protrusion;5, first surface;6, third groove;7, electric connection layer;8, piezoelectric ceramic layer;10, electrode layer;101, first electrode layer;1011, a area;1012, b area;1013, c area;1014, d area;102, second electrode layer;1021, a ， area;1022, b ， area;1023, c ， area;1024, d ，Area; 111, First conducting electrode; 112, Second conducting electrode; 12, First electrical connection terminal; 13, Second electrical connection terminal; 14, First conducting terminal; 15, Second conducting terminal; 16, Housing; 17, Moving carrier; 18, Base; 19, Drive assembly; 20, Circuit board; 21, Pre-compression component; 22, Linear piezoelectric actuator; 23, First flexible pad; 24, Friction plate; 25, Sliding shaft; 26, Magnet; 27, Hall sensor; 28, TMR angle sensor; 29, Mounting plate. Detailed Implementation

[0039] To better understand the purpose, structure, and function of this utility model, the linear piezoelectric drive device of this utility model will be described in further detail below with reference to the accompanying drawings. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of this utility model, but are merely for illustrating the essential spirit of the technical solution of this utility model.

[0040] Figure 1 The structure of one embodiment of the linear piezoelectric drive device of this utility model is shown, as follows: Figure 1 As shown, the linear piezoelectric drive device mainly includes a base 18, a moving carrier 17, a housing 16, and a drive assembly 19. The base 18 has a first groove on its bottom surface to accommodate electronic components and reduce the overall volume of the drive device. The base 18 has a hollow structure, and a sliding shaft 25 is fixed on the inner side wall of the base 18 along the axial direction. The moving carrier 17 is slidably connected and embedded in the base 18 through the sliding shaft 25 and can move longitudinally within the base 18. The moving carrier 17 is used to connect the driven component, which can be a lens or an infrared device, to achieve functions such as driving lens zoom or night vision aiming.

[0041] like Figure 1 The disassembled diagrams of each component shown and Figure 3 As shown in the overall structural diagram, most of the components of this utility model are mounted on the mobile carrier 17 and the base 18, with the housing 16 serving only as an auxiliary component. Figure 3 As can be seen, the mobile carrier 17 is embedded in the base 18. Figure 1 In the middle, a magnet 26 is provided on the side of the mobile carrier 17 at a position corresponding to the sliding shaft 25. The magnet 26 and the sliding shaft 25 are attracted to each other and generate magnetic attraction, which plays a pre-compression role on the mobile carrier 17 to ensure the stability of the mobile carrier 17 during movement.

[0042] like Figure 1 and 2As shown, the driving assembly 19 is located on one side of the base 18 and abuts the moving carrier 17, the driving assembly 19 includes a linear piezoelectric actuator 22, a circuit board 20 and a pre-pressing piece 21, one end of the pre-pressing piece 21 abuts the linear piezoelectric actuator 22, and the other end abuts the base 18, the circuit board 20 is electrically connected to the linear piezoelectric actuator 22, wherein the two ends of the linear piezoelectric actuator 22 are provided with a first flexible pad 23, and the two end portions of the linear piezoelectric actuator 22 are arranged in a second groove of the first flexible pad 23, the first flexible pad 23 is used to fix the linear piezoelectric actuator 22 and plays a role of buffering the deformation of the elastic body 3; the side of the linear piezoelectric actuator 22 close to the pre-pressing piece 21 is provided with a second flexible pad for abutting the pre-pressing piece 21, reducing the friction between the pre-pressing piece 21 and the linear piezoelectric actuator 22, and playing a buffering role.

[0043] Preferably, the circuit board 20 is a PCB circuit board.

[0044] Figures 4 to 10 A first embodiment of the linear piezoelectric actuator 22 is shown in detail, as shown in Figure 4 and Figure 5 As shown, the linear piezoelectric actuator 22 has a piezoelectric element 1 and an elastic body 3, the piezoelectric element 1 is a piezoelectric ceramic sheet, wherein the piezoelectric ceramic sheet is at least one piece, and as preferred, the piezoelectric ceramic sheet is two pieces, the elastic body 3 is provided with a first face 5 and a second face corresponding to the first face 5, and two ends are provided with a third groove 6, the elastic body 3 has a certain thickness, the elastic body 3 is provided with at least one actuating protrusion 2 for amplifying the deformation of the elastic body 3, and the piezoelectric ceramic sheet and the elastic body 3 are insulated. Figure 6 As shown, the piezoelectric element 1 is a laminated piezoelectric ceramic, including an electrical connection layer 7, a piezoelectric ceramic layer 8, an electrode layer 10 and a first conductive electrode 111, the electrical connection layer 7 is used to access an external electrical signal and simultaneously transmit the external electrical signal to the first conductive electrode 111, and the first conductive electrode 111 transmits the electrical signal to the electrode layer 10 again.

[0045] Preferably, as shown in Figure 8a , 8b , 9a, 9b, the first conductive electrode 111 is arranged on the side of the piezoelectric ceramic sheet, the first conductive electrode 111 includes a first conductive end 14 and a second conductive end 15, and transmits the electrical signal to the electrode layer 10 again; the electrode layer 10 includes a first electrode layer 101 and a second electrode layer 102, wherein the first conductive end 14 is electrically connected to the first electrode layer 101, and the second conductive end 15 is electrically connected to the second electrode layer 102.

[0046] In this design, the first layer of the piezoelectric element 1 is an electrical connection layer 7. Apart from the electrical connection layer 7, the other layers of the piezoelectric element 1 are stacked in sequence as a piezoelectric ceramic layer 8, a first electrode layer 101, a piezoelectric ceramic layer 8, and a second electrode layer 102. The last layer of the piezoelectric element 1 is a piezoelectric ceramic layer 8. The number of electrical connection layers 7 is 1. The number of first electrode layers 101 is N, i.e., at least one. The number of second electrode layers 102 is M, i.e., at least one. The number of piezoelectric ceramic layers 8 is N+M+1, which is the sum of the number of electrical connection layers 7, the number of first electrode layers 101, and the number of second electrode layers 102.

[0047] like Figure 7a As shown, the first electrode layer 101 is divided into four sections, namely section a 1011, section b 1012, section c 1013 and section d 1014. Section b 1012 and section d 1014 are in a conductive state. One of section b 1012 or section d 1014, as well as section a 1011 and section c 1013, are each provided with a first electrical connection terminal 12. The first electrical connection terminal 12 is electrically connected to the first conductive terminal 14.

[0048] like Figure 7b As shown, the second electrode layer 102 is divided into four sections, namely a ， District 1021, b ， District 1022, c ， District 1023 and d ， District 1024, of which a ， District 1021 and C ， The circuit between zones 1023 is in a conductive state, a ， Zone 1021 or C ， District 1023, one of them and b ， District 1022, d ， Each zone 1024 is provided with a second electrical connection terminal 13, which is electrically connected to the second conductive terminal 15.

[0049] Figures 11 to 14 A second embodiment of the linear piezoelectric actuator 22 is shown in detail. The piezoelectric element 1 includes an electrical connection layer 7, a piezoelectric ceramic layer 8, an electrode layer 10, and a second conductive electrode 112. The electrode layer 10 includes a first electrode layer 101 and a second electrode layer 102. The first electrode layer 101 is divided into four sections: a section 1011, b section 1012, c section 1013, and d section 1014, wherein b section 1012 and d section 1014 are in a conductive state. The second electrode layer 102 is also divided into four sections: a section 1011, b section 1012, c section 1013, and d section 1014. ， District 1021, b ， District 1022, c ， District 1023 and d ， District 1024, of which a ， District 1021 and C， The area 1023 is in an on state.

[0050] The difference between the first embodiment is that the layers of the piezoelectric element 1 except the electric connection layer 7, i.e. the piezoelectric ceramic layer 8 and the electrode layer 10, are directly punched, the second conductive electrode 112 is a column which can be tightly inserted into the hole, one of the b area 1012 or d area 1014 in the first electrode layer 101, and the a area 1011, c area 1013 and the second conductive electrode 112 are directly contacted to realize the electric connection, one of the a area 1021 or c area 1023 in the second electrode layer 102, and the b area 1022, d area 1024 are directly contacted to realize the electric connection with the second conductive electrode 112 respectively; the four sub-areas of the first electrode layer 101 are no longer provided with the first electric connection end 12, the four sub-areas of the second electrode layer 102 are no longer provided with the second electric connection end 13, and the second conductive electrode 112 can penetrate through the entire piezoelectric element 1 except the electric connection layer 7. This form can save space. ， The area 1021 or c ， The area 1023 of the b ， The area 1022, d ， The area 1024 respectively; the four sub-areas of the first electrode layer 101 are no longer provided with the first electric connection end 12, the four sub-areas of the second electrode layer 102 are no longer provided with the second electric connection end 13, and the second conductive electrode 112 can penetrate through the entire piezoelectric element 1 except the electric connection layer 7. This form can save space.

[0051] Preferably, the side of the moving carrier 17 towards the actuating protrusion 2 is fixedly connected with a friction sheet 24 which abuts against the actuating protrusion 2, so as to increase the friction between the two and facilitate the driving of the moving carrier 17.

[0052] Preferably, the base 18 is provided with a Hall sensor 27 which is correspondingly arranged with one of the magnets 26 on the side of the moving carrier 17, and the Hall sensor 27 and the magnet 26 cooperate to detect the displacement of the moving carrier 17.

[0053] Preferably, the moving carrier 17 is further provided with a TMR angle sensor 28 which can detect the magnetic direction in 360°, so as to increase the stability; the linear piezoelectric driving device further comprises a mounting plate 29.

[0054] Preferably, the first flexible pad 23 and the second flexible pad at the two ends of the linear piezoelectric actuator 22 are rubber pads.

[0055] Preferably, the pre-pressing part 21 can be a spring, a spring sheet or other components which have the function of deformation.

[0056] Preferably, the elastic body 3 of the linear piezoelectric actuator 22 in the embodiment is provided with one actuating protrusion, and in some modified embodiments of the embodiment, the elastic body 3 of the linear piezoelectric actuator 22 is provided with two actuating protrusions 2, and one adjusting protrusion 4 is arranged between the two actuating protrusions 2, which is used for adjusting the vibration mode of the entire piezoelectric actuator and can adapt to a larger movement stroke.

[0057] The working principle of the utility model is: after the drive assembly 19 is electrified, under the pre-pressing effect of the pre-pressing piece 21, the actuating protrusion 2 is pressed against the friction plate 24, the moving carrier 17 moves longitudinally along the slide shaft 25 under the friction force, thereby driving the driven component to move, and the Hall 27 or the TMR angle sensor 28 detects the moving carrier displacement 17 in real time.

[0058] The utility model drives simple structure, simple technology, is fit in general industrialization popularization.

[0059] The above shows and describes the basic principle and main features and the advantages of the utility model, and the technical personnel in the industry should understand that the utility model is not limited by the above examples, and the above examples and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A linear piezoelectric drive device, characterized by The application relates to a linear motion device. The base (18) is internally provided with a sliding shaft (25) along the axial direction; The moving carrier (17) is slidably connected to the base (18) through the sliding shaft (25); The driving assembly (19) is arranged on one side of the base (18) and abuts against the moving carrier (17), and the driving assembly (19) comprises a linear piezoelectric actuator (22), a circuit board (20) and a pre-pressing piece (21), the circuit board (20) is electrically connected to the linear piezoelectric actuator (22), one end of the pre-pressing piece (21) abuts against the linear piezoelectric actuator (22), and the other end of the pre-pressing piece (21) abuts against the base (18); The pre-pressing piece (21) is a deformation component.

2. The linear piezoelectric driving device according to claim 1, characterized by The moving carrier (17) is provided with a magnet (26) on the side surface, the magnet (26) is oppositely and attractively arranged relative to the sliding shaft (25), and the base (18) is internally provided with a sensor which is correspondingly arranged relative to the magnet (26).

3. The linear piezoelectric driving device according to claim 1, wherein The linear piezoelectric actuator (22) comprises an elastic body (3) and a piezoelectric element (1), the piezoelectric element (1) is at least one piezoelectric ceramic sheet, the piezoelectric ceramic sheet is fixedly connected with the elastic body (3), and the piezoelectric ceramic sheet is insulated from the elastic body (3).

4. The linear piezoelectric driving device according to claim 3, wherein The piezoelectric element (1) is a laminated piezoelectric ceramic, comprising an electric connection layer (7), a piezoelectric ceramic layer (8) and an electrode layer (10); the electrode layer (10) comprises a first electrode layer (101) and a second electrode layer (102), the first layer of the piezoelectric element (1) is the electric connection layer (7), except the electric connection layer (7), the rest layers of the piezoelectric element (1) are sequentially stacked in the mode of the piezoelectric ceramic layer (8), the first electrode layer (101), the piezoelectric ceramic layer (8), the second electrode layer (102), and the tail layer of the piezoelectric element (1) is the piezoelectric ceramic layer (8), the number of the electric connection layer (7) is one, the number of the first electrode layer (101) is N, the number of the second electrode layer (102) is M, and the number of the piezoelectric ceramic layer (8) is N+M+1.

5. The linear piezoelectric driving device according to claim 3, wherein The elastic body (3) is provided with at least one actuating protrusion (2) which abuts against the moving carrier (17).

6. The linear piezoelectric driving device according to claim 4, wherein The first electrode layer (101) is divided into four sub-zones, a zone (1011), a zone (1012), a zone (1013) and a zone (1014), and the zone (1012) and the zone (1014) are in a conductive state. ， The second electrode layer (102) is divided into four sub-zones, a zone (1021), a zone (1022), a zone (1023) and a zone (1024), and the zone (1021) and the zone (1023) are in a conductive state. ， ， ， ， ， ​​​​​ 7. The linear piezoelectric drive device according to claim 6, characterized by The piezoelectric element (1) further comprises a first conducting electrode (111) electrically connected with the electrode layer (10); the first conducting electrode (111) is arranged on the side of the piezoelectric ceramic sheet, and the first conducting electrode (111) comprises a first conducting end (14) and a second conducting end (15); one of the b region (1012) or the d region (1014) of the first electrode layer (101), and the a region (1011) and the c region (1013) are respectively provided with a first electrical connection end (12), and the first electrical connection end (12) is electrically connected with the first conducting end (14); one of the a region (1021) or the c region (1023) of the second electrode layer (102), the b region (1022), the d region (1024) are respectively provided with a second electrical connection end (13), and the second electrical connection end (13) is electrically connected with the second conducting end (15). ， ， ， ， ​​​​ 8. The linear piezoelectric driving device according to claim 6, wherein The piezoelectric element (1) further comprises a second conductive electrode (112) electrically connected with the electrode layer (10), the piezoelectric element (1) is provided with a through hole, the second conductive electrode (112) is embedded in the hole and penetrates through the piezoelectric element (1), one of the b region (1012) or the d region (1014) in the first electrode layer (101) and the a region (1011), the c region (1013) are respectively electrically connected with the second conductive electrode (112); one of the a ， region (1021) or the c ， region (1023) in the second electrode layer (102), the b ， region (1022), the d ， region (1024) are respectively electrically connected with the second conductive electrode (112).

9. The linear piezoelectric driving device according to claim 5, wherein The moving carrier (17) is fixedly connected with a friction plate (24) on the side facing the actuating protrusion (2), and the friction plate (24) abuts against the actuating protrusion (2).

10. The linear piezoelectric drive according to any one of claims 1 to 9, characterized in that The linear piezoelectric actuator (22) is provided with a first flexible pad (23) at both ends, and the two ends of the linear piezoelectric actuator (22) are arranged in a second groove of the first flexible pad (23); a second flexible pad is arranged on the side of the linear piezoelectric actuator (22) close to the pre-pressing piece (21) and used for abutting against the pre-pressing piece (21).

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