Wave plate rotating device

Abstract

The invention provides a wave plate rotating device, which comprises a rotating assembly, a wave plate, a driving assembly and a driving assembly, and is characterized in that the wave plate is fixed with the rotating assembly; the piezoelectric driving assembly is in contact with the rotating assembly, and the piezoelectric driving assembly is used for generating tangential component force on the rotating assembly through a contact point to drive the rotating assembly to rotate; and the encoder assembly is used for measuring the angular displacement of the rotating assembly so as to realize the angular displacement measurement of the wave plate. A rhombic telescopic structure suitable for piezoelectric driving is adopted, the problem of wave plate rotation in the field of laser communication is solved, and the requirements for light weight, miniaturization and high precision of an optical assembly in the field of laser communication are met.

Description

Technical Field

[0001] The present invention relates to the technical field of laser communication, and particularly relates to a waveplate rotation device. Background Art

[0002] In the technical field of laser communication, the rotation of a waveplate is usually utilized to control the polarization state of light, thereby improving the quality of the communication system and the efficiency of signal transmission. For problems of rotational displacement driving such as waveplate rotation, due to the particularity of the application scenario, there are high requirements for the accuracy, size, and stability of the driver.

[0003] In the related art, a stepping motor is generally used to drive the rotation of the waveplate. The stepping motor converts electrical energy into mechanical energy to drive the waveplate to operate. The stepping motor usually has low accuracy, large size, and complex structure, and cannot solve the contradiction between high positioning accuracy and short stroke. Summary of the Invention

[0004] The present invention provides a waveplate rotation device to solve the above technical problems.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An embodiment of the present invention provides a waveplate rotation device, including: a rotation assembly, the waveplate is fixed to the rotation assembly, and the rotation assembly is used to drive the waveplate to rotate; a piezoelectric drive assembly, the piezoelectric drive assembly is in contact with the rotation assembly, the piezoelectric drive assembly adopts a rhombic telescopic structure, and the piezoelectric drive assembly is used to generate a tangential component force on the rotation assembly through the contact point to drive the rotation assembly to rotate; an encoder assembly, the encoder assembly is used to measure the angular displacement of the rotation assembly, thereby realizing the measurement of the angular displacement of the waveplate.

[0007] The waveplate rotation device proposed above by the present invention further has the following additional technical features:

[0008] According to an embodiment of the present invention, it further includes: an external component, wherein, the external component includes: a mounting base, a cover plate, and a wire outlet terminal; the mounting base and the cover plate form the housing of the waveplate rotation device, the wire outlet terminal is connected to the mounting base by a thread, and the wire outlet terminal is used to lead out the cables of the piezoelectric drive assembly and the encoder assembly.

[0009] According to an embodiment of the present invention, the rotation assembly includes: a rotor, the rotor and the waveplate are fixed by an internal thread retaining ring; a deep groove ball bearing, the deep groove ball bearing is installed on the rotor and fixed by a threaded gland.

[0010] According to an embodiment of the present invention, the piezoelectric drive assembly includes: a diamond preload; a ceramic wafer, which is bonded to the end of the diamond preload as the contact point with the rotor; a preload spring, the two ends of which are respectively connected to the mounting seat and the diamond preload to apply a centripetal force to the ceramic wafer so that it closely fits the rotor; and a piezoelectric ceramic, which is tightly installed in the diamond structure of the diamond preload, and the maximum plastic deformation amount of the diamond structure is greater than the electrostrictive amount generated by the piezoelectric ceramic.

[0011] According to an embodiment of the present invention, the encoder assembly includes: a magnetic ring and an encoder; wherein, the magnetic ring is adsorbed on the rotor under the action of magnetic force and rotates with the rotor; the encoder is fixedly installed on the mounting seat, and the encoder is used to read the magnetic field change caused by the rotation of the magnetic ring to realize the angular displacement measurement of the rotor.

[0012] The present invention has the following beneficial effects:

[0013] By adopting a diamond telescopic structure suitable for piezoelectric drive, the problem of wave plate rotation in the field of laser communication is solved, meeting the requirements of lightweight, miniaturization and high precision of optical components in the field of laser communication. Description of the Drawings

[0014] Figure 1 is a top cross-sectional schematic view of a wave plate rotation device according to an embodiment of the present invention;

[0015] Figure 2 is a front cross-sectional schematic view of a wave plate rotation device according to an embodiment of the present invention;

[0016] Figure 3 is a three-dimensional view of a wave plate rotation device according to an embodiment of the present invention.

[0017] Reference numerals: rotation assembly 1, piezoelectric drive assembly 2, encoder assembly 3, wave plate 4, external assembly 5, rotor 11, deep groove ball bearing 12, internal thread retaining ring 13, thread gland 14, porcelain wafer 21, diamond preload 22, preload spring 23 and piezoelectric ceramic 24, magnetic ring 31, encoder 32, mounting seat 51, cover plate 52 and lead-out terminal 53. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] The following describes the wave plate rotation device according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0020] Figure 1 It is a top cross-sectional schematic view of a wave plate rotation device according to an embodiment of the present invention. Figure 2 It is a front cross-sectional schematic view of a wave plate rotation device according to an embodiment of the present invention.

[0021] As Figure 1-2 shown, the wave plate rotation device includes: a rotation assembly 1, a piezoelectric drive assembly 2, and an encoder assembly 3.

[0022] Among them, the wave plate 4 is fixed to the rotation assembly 1, and the rotation assembly 1 is used to drive the wave plate 4 to rotate; the piezoelectric drive assembly 2 is in contact with the rotation assembly 1, the piezoelectric drive assembly 2 adopts a rhombic telescopic structure, and the piezoelectric drive assembly 2 is used to generate a tangential component force on the rotation assembly 1 through the contact point to drive the rotation assembly 2 to rotate; the encoder assembly 3 is used to measure the angular displacement of the rotation assembly 1, so as to realize the measurement of the angular displacement of the wave plate 4.

[0023] Specifically, the piezoelectric drive assembly 2 generates a tangential component force on the rotation assembly 1 through the contact point, exciting the rotation assembly 1 to rotate, thereby driving the wave plate 4 to rotate. The wave plate rotation device of the present invention adopts closed-loop control. The encoder assembly 3 monitors the actual position of the rotation assembly 1 and feeds this information back to the control system of the piezoelectric drive assembly 2. The control system compares it with the input position command and adjusts the piezoelectric drive assembly 2 according to the difference. The closed-loop control system can provide higher control accuracy and stability. Adopting a rhombic telescopic structure suitable for piezoelectric drive solves the problem of wave plate rotation in the field of laser communication and meets the requirements of lightweight, miniaturization, and high precision of optical components in the field of laser communication.

[0024] According to an embodiment of the present invention, as Figure 3 shown, the above-mentioned wave plate rotation device further includes: an external component 5, among which, the external component 5 includes: a mounting base 51, a cover plate 52, and a wire outlet terminal 53. The mounting base 51 and the cover plate 52 form the housing of the wave plate rotation device, and the wire outlet terminal 53 is connected to the mounting base 51 by a thread. The wire outlet terminal 53 is used to lead out the cables of the piezoelectric drive assembly 2 and the encoder assembly 3.

[0025] In an embodiment of the present invention, as Figure 2 shown, the rotation assembly 1 includes: a rotor 11 and a deep groove ball bearing 12. The rotor 11 and the wave plate 4 are fixed by an internal thread retaining ring 13; the deep groove ball bearing 12 is installed on the rotor 11 and fixed by a threaded gland 14.

[0026] Specifically, under the action of the piezoelectric drive assembly 2, the entire rotation assembly 1 will rotate together with the rotor 11.

[0027] In one embodiment of the present invention, as Figure 1 shown, the piezoelectric drive assembly 2 includes: a ceramic wafer 21, a rhombic preload 22, a preload spring 23, and a piezoelectric ceramic 24. Among them,

[0028] The ceramic wafer 21 is bonded to the end of the rhombic preload 22 as the contact point with the rotor 11; both ends of the preload spring 23 are respectively connected to the mounting base 51 and the rhombic preload 22 to apply a centripetal force to the ceramic wafer 21 to make it closely fit the rotor 11; the piezoelectric ceramic 24 is tightly installed in the rhombic structure of the rhombic preload 22, and the maximum plastic deformation amount of the rhombic structure is greater than the electrostrictive amount generated by the piezoelectric ceramic 24.

[0029] Specifically, the piezoelectric ceramic 24 is tightly installed in the rhombic structure of the rhombic preload 22. Since the maximum plastic deformation amount of the rhombic structure is greater than the electrostrictive amount generated by the piezoelectric ceramic 24, the ceramic wafer 21 fixed at the end of the rhombic preload 22 and the piezoelectric ceramic 24 have the same-direction displacement. Furthermore, under the action of friction, a tangential component force is generated on the rotor 11 to stimulate the rotation of the rotor 11. Under the action of the piezoelectric drive assembly 2, the entire rotating assembly 1 will rotate together with the rotor 11.

[0030] According to one embodiment of the present invention, as Figure 2 shown, the encoder assembly 3 includes: a magnetic ring 31 and an encoder 32. Among them, the magnetic ring 31 is adsorbed on the rotor 11 under the action of magnetic force and rotates with the rotor 11; the encoder 32 is fixedly installed on the mounting base 51, and the encoder 32 is used to read the magnetic field change caused by the rotation of the magnetic ring 31 to realize the angular displacement measurement of the rotor 11.

[0031] Specifically, the encoder 32 realizes the position measurement of the rotor 11 by reading the magnetic field change caused by the rotation of the magnetic ring 31, feeds this information back to the control system of the piezoelectric drive assembly 2, the control system compares it with the input position command, and adjusts the piezoelectric drive assembly 2 according to the difference. The closed-loop control system can provide higher control accuracy and stability.

[0032] In summary, the wave plate rotation device according to the embodiment of the present invention includes: a rotating assembly, the wave plate is fixed to the rotating assembly, and the rotating assembly is used to drive the wave plate to rotate; a piezoelectric drive assembly, the piezoelectric drive assembly is in contact with the rotating assembly, and the piezoelectric drive assembly is used to generate a tangential component force on the rotating assembly through the contact point to drive the rotation of the rotating assembly; an encoder assembly, the encoder assembly is used to measure the angular displacement of the rotating assembly, thereby realizing the angular displacement measurement of the wave plate. Thus, the present invention adopts a rhombic telescopic structure suitable for piezoelectric drive to solve the problem of wave plate rotation in the field of laser communication, meeting the requirements of lightweight, miniaturization, and high precision of optical components in the field of laser communication.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0035] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0038] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A wave plate rotation device, characterized in that, Comprising: A rotating component, the wave plate is fixed to the rotating component, and the rotating component is used to drive the wave plate to rotate; A piezoelectric driving component, the piezoelectric driving component is in contact with the rotating component, the piezoelectric driving component adopts a rhombic telescopic structure, and the piezoelectric driving component is used to generate a tangential component force on the rotating component through the contact point to drive the rotating component to rotate; An encoder component, the encoder component is used to measure the angular displacement of the rotating component, so as to realize the angular displacement measurement of the wave plate.

2. The wave plate rotation device according to claim 1, characterized in that, Further comprising: An external component, wherein the external component includes: a mounting seat, a cover plate and a wire outlet terminal; The mounting seat and the cover plate form the housing of the wave plate rotating device, the wire outlet terminal is threadedly connected to the mounting seat, and the wire outlet terminal is used to lead out the cables of the piezoelectric driving component and the encoder component.

3. The wave plate rotation device according to claim 2, wherein, The rotating component includes: A rotor, the rotor is fixed to the wave plate by an internal thread retaining ring; A deep groove ball bearing, the deep groove ball bearing is mounted on the rotor and fixed by a threaded gland.

4. The wave plate rotating device according to claim 3, characterized in that, The piezoelectric driving component includes: Rhombic preloading; A ceramic wafer, the ceramic wafer is bonded to the end of the rhombic preloading as the contact point with the rotor; A preloading spring, both ends of the preloading spring are respectively connected to the mounting seat and the rhombic preloading to apply a centripetal force to the ceramic wafer to make it closely fit the rotor; Piezoelectric ceramics, the piezoelectric ceramics are tightly mounted in the rhombic structure of the rhombic preloading, and the maximum plastic deformation amount of the rhombic structure is greater than the electrostrictive amount generated by the piezoelectric ceramics.

5. The wave plate rotation device according to claim 4, characterized in that The encoder component includes: a magnetic ring and an encoder; wherein, The magnetic ring is adsorbed on the rotor under the action of magnetic force and rotates with the rotor; The encoder is fixedly mounted on the mounting seat, and the encoder is used to read the magnetic field change caused by the rotation of the magnetic ring to realize the angular displacement measurement of the rotor.

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