Piezoelectric optical adjusting frame

Abstract

The utility model relates to the technical field of precision optical devices, and discloses a piezoelectric optical adjusting frame which comprises a fixed frame, a movable frame, an elastic connecting assembly and two piezoelectric drivers. A base is arranged in a shell of the piezoelectric actuator. And piezoelectric ceramics are arranged on the base. And a first gasket is arranged on the piezoelectric ceramic. A first ball abuts against the upper portion of the first gasket. A flexible hinge abuts against the upper portion of the first ball. And a push rod is arranged above the flexible hinge. A second ball abuts against the upper portion of the push rod. The second ball abuts against the movable frame. The shell penetrates through the fixing frame and is fixed to the fixing frame. The second ball pushes the movable frame to be close to or away from the fixed frame under the action of the piezoelectric ceramics. The two piezoelectric actuators are adopted to push the moving frame to achieve two-dimensional large-angle high-precision deflection of theta X and theta Y, the overall structure is simple and compact, and operation is reliable. The piezoelectric actuator is linearly driven by piezoelectric ceramics, and has the characteristics of large output, large load, high response speed and high resolution.

Description

Technical Field

[0001] This utility model belongs to the field of precision optical device technology, and specifically relates to a piezoelectric optical adjustment frame. Background Technology

[0002] In recent years, thanks to advancements in piezoelectric ceramic manufacturing processes and technologies, commercially available piezoelectric ceramic sheets now boast significant advantages such as miniaturization, high reliability, and stability, making them ideal for various precision adjustments and precision instrument applications. With the development of the optoelectronic industry, piezoelectric ceramics are being applied to optical adjustment frames. These frames are primarily used for clamping and adjusting optical components, as well as for beam direction adjustment, thereby achieving rapid and precise beam positioning. However, existing optical adjustment frames often suffer from complex structures, poor operational reliability, low repeatability, low load capacity, and low resolution in order to achieve X-axis and Y-axis deflection.

[0003] Based on the above, the current problem to be solved is to provide a piezoelectric optical adjustment frame that is compact in structure, reliable in operation, highly accurate, has a large load capacity, and high resolution. Utility Model Content

[0004] The purpose of this invention is to provide a piezoelectric optical adjustment frame, which aims to solve the problems of complex structure, poor reliability, low repeatability, low load and low resolution of existing optical adjustment frames.

[0005] This invention is achieved by providing a piezoelectric optical adjustment frame, comprising: a fixed frame, a movable frame, an elastic connecting assembly, and two piezoelectric actuators for pushing the movable frame to achieve X-axis and Y-axis deflection.

[0006] The piezoelectric actuator includes a housing, a base inside the housing, a piezoelectric ceramic on the base, a first pad on the side of the piezoelectric ceramic away from the base, a first ball bearing on top of the first pad, a flexible hinge on top of the first ball bearing, the flexible hinge being connected to the inner wall of the housing, a push rod on top of the flexible hinge, a second ball bearing on top of the push rod, the second ball bearing abutting against the movable frame; the housing passes through the fixed frame and is fixed to the fixed frame, the second ball bearing, under the action of the piezoelectric ceramic, pushes the movable frame closer to or away from the fixed frame.

[0007] Furthermore, a third ball bearing for support is abutted between the fixed frame and the movable frame, the third ball bearing being located between the two piezoelectric actuators and at the deflection axis of the X-axis and Y-axis.

[0008] Furthermore, the elastic connection assembly includes a tension spring, a first pull rod, and a second pull rod; both ends of the tension spring are connected to the first pull rod and the second pull rod, respectively; the fixed frame and the movable frame are respectively provided with a first mounting hole and a second mounting hole, and the first pull rod and the second pull rod are respectively installed in the first mounting hole and the second mounting hole.

[0009] Furthermore, the movable frame has a circular or C-shaped light-transmitting hole in the middle.

[0010] Furthermore, a protective sleeve is inserted into the end of the outer shell away from the second ball. The side wall of the outer shell is provided with a first insertion hole and a first insert piece at intervals, and the side wall of the protective sleeve is provided with a second insertion hole and a second insert piece at intervals. The first insertion hole is inserted into the second insert piece, and the first insert piece is inserted into the second insertion hole. A lock nut is provided on the outer side of the protective sleeve, and the lock nut is connected to the outer shell by threads.

[0011] Furthermore, the sheath has a cavity, and the base has a through hole corresponding to the cavity. The cavity and the through hole are used for wiring.

[0012] Furthermore, the flexible hinge includes a circular flexible arm and an annular connecting portion connected to the four edges of the circular flexible arm. The annular connecting portion is threadedly connected to the inner wall of the housing. The circular flexible arm has a ball socket at the center of the side closer to the first ball, and a connecting post at the center of the side of the circular flexible arm away from the first ball. The connecting post is connected to the push rod.

[0013] Furthermore, the push rod includes a connecting ring and a pushing end, the connecting ring being sleeved on the outside of the connecting post; the pushing end is provided with a spherical groove for contacting the second ball.

[0014] Furthermore, the movable frame is provided with a receiving groove, and two positioning pins are symmetrically and spaced apart in the receiving groove. The second ball abuts against the positioning pins, and the positioning pins are used for positioning and guiding.

[0015] Furthermore, the movable frame is provided with a receiving groove, and a second gasket is provided in the receiving groove, with the second ball abutting against the second gasket.

[0016] The beneficial effects of the piezoelectric optical adjustment frame provided by this utility model are as follows:

[0017] This invention employs two piezoelectric actuators to drive a moving frame, achieving high-precision deflection of large angles in two-dimensional θX and θY axes. The overall structure is simple, compact, and reliable in operation. The piezoelectric actuators utilize piezoelectric ceramic linear drives, featuring high output, high load capacity, fast response speed, and high resolution. The deflection of each axis is controlled by a single piezoelectric actuator. The X and Y axes share a common deflection axis, with no coupling between axes, resulting in more precise positioning and easier control.

[0018] The piezoelectric actuator employs a force output structure consisting of a first ball bearing, a flexible hinge, a push rod, and a second ball bearing. This structure is characterized by its simplicity, reliable contact, low mechanical wear, and long service life. The preload force in the elongation direction of the piezoelectric ceramic is adjusted through the stroke of the connection between the flexible hinge and the housing, further ensuring contact reliability and restoring force. Attached Figure Description

[0019] Figure 1 A three-dimensional structural diagram of the piezoelectric optical adjustment frame provided by this utility model;

[0020] Figure 2 Exploded view of the piezoelectric optical adjustment frame provided by this utility model;

[0021] Figure 3 Top view of the movable frame provided by this utility model;

[0022] Figure 4 Front view of the piezoelectric actuator provided by this utility model;

[0023] Figure 5 The utility model provides Figure 4 Sectional view along the AA direction;

[0024] Figure 6 Exploded view of the piezoelectric actuator provided by this utility model;

[0025] Figure 7 A three-dimensional structural diagram of the flexible hinge provided by this utility model;

[0026] Figure 8 A three-dimensional structural diagram of the flexible hinge provided by this utility model from another angle;

[0027] Figure 9 A three-dimensional structural diagram of the push rod provided by this utility model;

[0028] Figure 10 A three-dimensional structural diagram of the sheath provided by this utility model;

[0029] Figure 11 A three-dimensional structural diagram of the base provided by this utility model;

[0030] In the diagram: 1-Fixed frame; 2-Moving frame; 21-Light-transmitting hole; 22-X-axis moving plate; 23-Y-axis moving plate; 24-Receiving groove; 25-Positioning pin; 26-Second washer; 27-Second mounting hole; 3-Elastic connection assembly; 31-Tension spring; 32-First pull rod; 33-Second pull rod; 4-Piezoelectric actuator; 41-Housing shell; 411-First insertion hole; 412-First insert; 42-Base; 421-Through hole; 422-Fixed End; 43-Piezoelectric ceramic; 44-First gasket; 45-First ball; 46-Flexible hinge; 461-Circular flexible arm; 462-Annular connection; 463-Spherical socket; 464-Connecting post; 47-Push rod; 471-Connecting ring; 472-Push end; 4721-Spherical groove; 48-Second ball; 49-Sheath; 491-Second insertion hole; 492-Second insert; 493-Cavity; 410-Lock nut; 5-Third ball. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0032] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0033] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Reference Figure 1-11 The image shown is a preferred embodiment of the present invention.

[0035] The piezoelectric optical adjustment frame includes a fixed frame 1 and a movable frame 2 disposed above the fixed frame 1, as shown in the figure. Figure 1-2 The movable frame 2 has a circular or C-shaped light-transmitting hole 21 in the middle. Several elastic connecting components 3 are provided between the fixed frame 1 and the movable frame 2. The elastic connecting components 3 provide an elastic connection between the fixed frame 1 and the movable frame 2. Two piezoelectric actuators 4 are also provided between the fixed frame 1 and the movable frame 2. The movable frame 2 includes an X-axis moving plate 22 and a Y-axis moving plate 23, as shown in the figure. Figure 3Two piezoelectric actuators 4 are respectively in contact with the X-axis moving plate 22 and the Y-axis moving plate 23. The piezoelectric actuators 4 can push the moving frame 2 closer to or further away from the fixed frame 1. The piezoelectric actuator 4 that drives the X-axis moving plate 22 or the Y-axis moving plate 23 individually can make the moving frame 2 deflect along the Y-axis or the X-axis. The X-axis, Y-axis, and Z-axis form a spatial rectangular coordinate system.

[0036] The piezoelectric actuator 4 includes a housing 41, as shown in the reference. Figure 4-6 A base 42 is provided inside the outer casing 41. The base 42 is connected to the inner wall of the outer casing 41 by threads. A fixed end 422 is provided on the base 42, and a piezoelectric ceramic 43 is provided on the fixed end 422. The piezoelectric ceramic 43 can be a stacked piezoelectric ceramic, and the number of stacked piezoelectric ceramic sheets can be adjusted according to the required output force. The side of the piezoelectric ceramic 43 away from the base 42 (the moving end) is connected to a first pad 44. The first pad 44 is preferably a tungsten carbide pad. A first ball bearing 45 is abutted on the top of the first pad 44. A flexible hinge 46 is abutted on the top of the first ball bearing 45, and the flexible hinge 46 is connected to the inner wall of the outer casing 41. A push rod 47 is connected above the flexible hinge 46. A second ball bearing 48 is abutted on the top of the push rod 47. The second ball bearing 48 abuts against the bottom of the moving frame 2. The outer casing 41 passes through the fixed frame 1 and is fixed to the fixed frame 1. Grooves are respectively provided on the fixed frame 1 and the moving frame 2. A third ball bearing 5 for deflection support is abutted between the fixed frame 1 and the movable frame 2. The third ball bearing 5 is located in a groove, and the contact surface between the groove and the third ball bearing 5 is spherical. Preferably, the third ball bearing 5 is located between the two piezoelectric actuators 4 and at the intersection of the X-axis movable plate 22 and the Y-axis movable plate 23, that is, the X-axis and Y-axis have a common deflection axis, and the inter-axis coupling is small.

[0037] Working principle: When voltage is applied, the piezoelectric ceramic 43 elongates, pushing the second ball 48 to move. The second ball 48 pushes the moving frame 2 away from the fixed frame 1. When the voltage is removed, the piezoelectric ceramic 43 returns to its original length, and the second ball 48 moves towards the fixed frame 1, and the moving frame 2 moves towards the fixed frame 1 simultaneously. The piezoelectric actuator 4 of the X-axis moving plate 22 moves, the piezoelectric actuator 4 of the Y-axis moving plate 23 remains stationary, and the moving frame 2 deflects around the Y-axis. The piezoelectric actuator 4 of the Y-axis moving plate 23 moves, the piezoelectric actuator 4 of the X-axis moving plate 22 remains stationary, and the moving frame 2 deflects around the X-axis.

[0038] The elastic connection assembly 3 includes a tension spring 31, a first pull rod 32, and a second pull rod 33, as shown in the figure. Figure 2 The two ends of the tension spring 31 are connected to the first tension rod 32 and the second tension rod 33, respectively. The fixed frame 1 has a first mounting hole corresponding to the first tension rod 32. The movable frame 2 has a second mounting hole 27 corresponding to the second tension rod 33. The first tension rod 32 and the second tension rod 33 are respectively installed in the first mounting hole and the second mounting hole 27. The elastic connecting assembly 3 provides a restoring force for the movable frame 2.

[0039] For ease of wiring, a sheath 49 is inserted into the end of the outer casing 41 away from the second ball bearing 48. (Refer to...) Figure 10 The outer casing 41 has a first insertion hole 411 and a first insert 412 spaced apart on the side away from the second ball bearing 48. The sheath 49 has a second insert 492 and a second insertion hole 491 corresponding to the first insertion hole 411 and the first insert 412. The first insertion hole 411 is inserted into the second insert 492, and the first insert 412 is inserted into the second insertion hole 491. A lock nut 410 is provided on the outer side of the sheath 49, and the lock nut 410 is connected to the outer casing 41 by threads, fixing the sheath 49 inside the lock nut 410. The spaced second insert 492 and the second insertion hole 491 form a cavity 493. The base 42 is provided with a through hole 421 corresponding to the cavity 493. The power supply line enters the casing 41 through the cavity 493 and the through hole 421 to supply power to the piezoelectric ceramic 43.

[0040] Preferably, the flexible hinge 46 includes a circular flexible arm 461 and an annular connecting portion 462 connected to the four edges of the circular flexible arm 461, see reference. Figure 7-8 The annular connecting part 462 is threadedly connected to the inner wall of the outer casing 41. The preload of the flexible hinge 46 on the piezoelectric ceramic 43 is controlled by adjusting the thread stroke between the annular connecting part 462 and the outer casing 41.

[0041] A ball socket 463 is provided at the center of the circular flexible arm 461 on the side closest to the first ball 45, for accommodating the first ball 45. A connecting post 464 is provided at the center of the circular flexible arm 461 on the side furthest from the first ball 45. The connecting post 464 is connected to the push rod 47. The push rod 47 includes a connecting ring 471 and a pushing end 472, as shown in the figure. Figure 9 The connecting ring 471 is hollow and has internal threads. The connecting ring 471 is sleeved on the outside of the connecting post 464 and fixed to the connecting post 464 by the threads. The pushing end 472 has a spherical groove 4721 for contacting the second ball 48. The spherical groove 4721 ensures reliable partial spherical contact between the groove and the second ball 48, preventing displacement.

[0042] Contact method 1 between the movable frame 2 and the second ball bearing 48: The bottom of the movable frame 2 is provided with a receiving groove 24, as shown in the reference. Figure 3 The receiving groove 24 has two symmetrically spaced locating pins 25 inside. The second ball 48 abuts against the locating pins 25. The locating pins 25 are used for positioning and guiding.

[0043] The second contact method between the movable frame 2 and the second ball bearing 48 is as follows: The bottom of the movable frame 2 is provided with a receiving groove 24. A second gasket 26 is provided in the receiving groove 24. The second ball bearing 48 abuts against the second gasket 26, and the second gasket 26 is preferably a wear-resistant tungsten carbide gasket.

[0044] This invention is not intended to limit the scope of this invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention shall be included within the protection scope of this invention.

Claims

1. A piezoelectric optical adjustment frame, characterized in that, include: Fixed frame (1), movable frame (2), elastic connection assembly (3) and two piezoelectric actuators (4) for pushing the movable frame (2) to achieve X-axis deflection and Y-axis deflection; The piezoelectric actuator (4) includes a housing (41), a base (42) is provided inside the housing (41), a piezoelectric ceramic (43) is provided on the base (42), a first pad (44) is provided on the side of the piezoelectric ceramic (43) away from the base (42), a first ball (45) is abutted above the first pad (44), a flexible hinge (46) is abutted above the first ball (45), the flexible hinge (46) is connected to the inner wall of the housing (41), a push rod (47) is provided above the flexible hinge (46), a second ball (48) is abutted above the push rod (47), and the second ball (48) abuts against the movable frame (2); the housing (41) passes through the fixed frame (1) and is fixed to the fixed frame (1), and the second ball (48) pushes the movable frame (2) closer to or away from the fixed frame (1) under the action of the piezoelectric ceramic (43).

2. The piezoelectric optical adjustment frame according to claim 1, characterized in that, A third ball bearing (5) for support is abutted between the fixed frame (1) and the movable frame (2). The third ball bearing (5) is located between the two piezoelectric actuators (4) at the deflection axis of the X-axis and Y-axis.

3. The piezoelectric optical adjustment frame according to claim 1, characterized in that, The elastic connection assembly (3) includes a tension spring (31), a first pull rod (32), and a second pull rod (33); the two ends of the tension spring (31) are respectively connected to the first pull rod (32) and the second pull rod (33); the fixed frame (1) and the movable frame (2) are respectively provided with a first mounting hole and a second mounting hole (27), and the first pull rod (32) and the second pull rod (33) are respectively installed in the first mounting hole and the second mounting hole (27).

4. The piezoelectric optical adjustment frame according to claim 1, characterized in that, The movable frame (2) has a circular or C-shaped light-transmitting hole (21) in the middle.

5. The piezoelectric optical adjustment frame according to claim 1, characterized in that, A sheath (49) is inserted into one end of the outer casing (41) away from the second ball (48). The side wall of the outer casing (41) is provided with a first insertion hole (411) and a first insert (412) spaced apart. The side wall of the sheath (49) is provided with a second insertion hole (491) and a second insert (492) spaced apart. The first insertion hole (411) is inserted into the second insert (492), and the first insert (412) is inserted into the second insertion hole (491). A lock nut (410) is provided on the outside of the sheath (49). The lock nut (410) is connected to the outer casing (41) by threads.

6. The piezoelectric optical adjustment frame according to claim 5, characterized in that, The sheath (49) has a cavity (493), and the base (42) is provided in the through hole (421) corresponding to the cavity (493). The cavity (493) and the through hole (421) are used for wiring.

7. The piezoelectric optical adjustment frame according to claim 1, characterized in that, The flexible hinge (46) includes a circular flexible arm (461) and an annular connecting part (462) connected to the four edges of the circular flexible arm (461). The annular connecting part (462) is threaded to the inner wall of the outer shell (41). The circular flexible arm (461) has a ball socket (463) at the center of the side near the first ball (45), and a connecting post (464) at the center of the side of the circular flexible arm (461) away from the first ball (45). The connecting post (464) is connected to the push rod (47).

8. The piezoelectric optical adjustment frame according to claim 7, characterized in that, The push rod (47) includes a connecting ring (471) and a pushing end (472). The connecting ring (471) is sleeved on the outside of the connecting post (464). The pushing end (472) is provided with a spherical groove (4721) for contacting the second ball (48).

9. The piezoelectric optical adjustment frame according to claim 1, characterized in that, The movable frame (2) is provided with a receiving groove (24), and two positioning pins (25) are symmetrically and spaced apart in the receiving groove (24). The second ball (48) abuts against the positioning pin (25), and the positioning pin (25) is used for positioning and guiding.

10. The piezoelectric optical adjustment frame according to claim 1, characterized in that, The movable frame (2) is provided with a receiving groove (24), and a second gasket (26) is provided in the receiving groove (24). The second ball (48) abuts against the second gasket (26).

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