Variable divergence angle device and laser communication terminal

Abstract

The present application relates to the technical field of laser communication equipment, and provides a variable divergence angle device and a laser communication terminal. The variable divergence angle device includes a base, a motion platform, a focusing lens group and a piezoelectric driver, the motion platform is mounted on the base, the motion platform can move relative to the base, the focusing lens group is arranged on the motion platform, the piezoelectric driver is mounted on the base, the piezoelectric driver is connected to the motion platform, and the piezoelectric driver is suitable for deformation to drive the motion platform to move linearly relative to the base. According to the variable divergence angle device of the embodiment of the present application, the single movement distance of the focusing lens group is reduced, and high-precision adjustment of the focusing lens group is achieved, and no additional transmission mechanism or other components are required, the structure is simplified, the size of the variable divergence angle device is reduced, and the weight of the variable divergence angle device is reduced, so that the variable divergence angle device can meet the demand for lightweight.

Description

Technical Field

[0001] The present application relates to the technical field of laser communication equipment, and in particular to a variable divergence angle device and a laser communication terminal. Background Art

[0002] In space laser communications, the defocusing effect is mainly produced by adjusting the focusing mirror through a variable divergence angle device, thereby changing the size of the divergence angle of the laser.

[0003] The variable divergence angle device in the related art is large in size and heavy in weight, which makes it difficult to meet the lightweight requirements in the field of space laser communications, and the adjustment accuracy is low. Summary of the invention

[0004] The present application aims to at least solve the technical problems existing in the related technology. To this end, the present application proposes a variable divergence angle device and a laser communication terminal, which reduces the single movement distance of the focusing lens group, realizes high-precision adjustment of the focusing lens group, and does not require additional transmission mechanisms and other components, simplifies the structure, reduces the size of the variable divergence angle device, and reduces the weight of the variable divergence angle device, so that the variable divergence angle device can meet the demand for lightweight.

[0005] The variable divergence angle device according to the first aspect of the present application includes:

[0006] Base;

[0007] A motion platform, mounted on the base, and the motion platform can move relative to the base;

[0008] A focusing lens assembly, arranged on the motion platform;

[0009] A piezoelectric driver is installed on the base, the piezoelectric driver is connected to the motion platform, and the piezoelectric driver is suitable for deforming to drive the motion platform to move linearly relative to the base.

[0010] According to the variable divergence angle device of the embodiment of the present application, when the position of the focusing lens group needs to be adjusted, the piezoelectric driver switches between deformation and recovery deformation, so that the piezoelectric driver drives the motion platform to move, and the focusing lens group installed on the motion platform moves accordingly, and the movement of the motion platform is driven by the deformation of the piezoelectric driver. The distance that the piezoelectric driver can drive the motion platform to move each time it deforms is small, thereby reducing the single movement distance of the focusing lens group, achieving high-precision adjustment of the focusing lens group, and no additional transmission mechanism or other components are required, simplifying the structure, reducing the size of the variable divergence angle device, and reducing the weight of the variable divergence angle device, so that the variable divergence angle device can meet the demand for lightweight. And because the piezoelectric driver is connected to the motion platform, when the piezoelectric driver is not working, the piezoelectric driver can also limit the motion platform to prevent the focusing lens group from shifting.

[0011] According to one embodiment of the present application, the piezoelectric driving component includes a piezoelectric material piece, the piezoelectric material piece is installed on the base, the piezoelectric material piece is abutted against the moving platform, and the piezoelectric material piece is connected to the base through a connecting component so that there is friction between the piezoelectric material piece and the moving platform.

[0012] According to one embodiment of the present application, the friction force between the piezoelectric material piece and the motion platform is 0.9N-1.1N.

[0013] According to an embodiment of the present application, the variable divergence angle device includes a position detection component, which is installed on the base and is used to detect the position of the focusing lens group.

[0014] According to one embodiment of the present application, the position detection component includes a scale and a reading head, the scale is installed on the motion platform or the focusing lens group, the reading head is installed on the base, the reading head faces the scale, and the reading head is used to read the value of the scale.

[0015] According to an embodiment of the present application, an installation space is formed between the position detection component and the motion platform, and the piezoelectric driver is installed in the installation space; and / or,

[0016] The position detection component and the piezoelectric drive element are located on the same side of the motion platform; and / or,

[0017] The scale and the piezoelectric drive are connected to the side wall surface of the motion platform.

[0018] According to an embodiment of the present application, the motion straight line of the motion platform coincides with the optical axis of the focusing lens assembly.

[0019] According to one embodiment of the present application, the variable divergence angle device includes an optical fiber assembly, the optical fiber assembly is installed on the base, the optical fiber assembly is arranged opposite to the focusing lens group, and the piezoelectric drive component is suitable for driving the motion platform to move so that the focusing assembly is close to or away from the optical fiber assembly.

[0020] According to one embodiment of the present application, the variable divergence angle device includes an optical fiber bracket and a light shield, the optical fiber is installed on the base, the optical fiber assembly and the light shield are both installed on the optical fiber bracket, and the light shield is located between the optical fiber assembly and the focusing lens group; and / or,

[0021] The variable divergence angle device comprises a guide rail, the guide rail is installed on the base, and the motion platform is movably connected to the guide rail.

[0022] The laser communication terminal according to the second embodiment of the present application includes the variable divergence angle device described above.

[0023] According to the laser communication terminal of the present application, it has the above-mentioned variable divergence angle device, and also has all the technical effects of the above-mentioned variable divergence angle device, which will not be repeated here.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is one of the structural schematic diagrams of the variable divergence angle device provided in this application;

[0027] Figure 2 This is the second structural schematic diagram of the variable divergence angle device provided in this application.

[0028] Reference numerals:

[0029] 1. Base; 2. Motion platform; 3. Focusing lens group; 4. Piezoelectric drive; 5. Position detection component;

[0030] 6. Installation space; 7. Optical fiber assembly; 8. Optical fiber bracket; 9. Light shield; 10. Guide rail;

[0031] 51. Scale; 52. Reading head. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0033] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application 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, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0035] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Combine the following Figure 1 and Figure 2 The variable divergence angle device and laser communication terminal of the present application are described.

[0038] According to the embodiment of the first aspect of the present application, Figure 1 and Figure 2 As shown, the variable divergence angle device includes a base 1, a moving platform 2, a focusing lens group 3 and a piezoelectric driver 4. The moving platform 2 is installed on the base 1, and the moving platform 2 can move relative to the base 1. The focusing lens group 3 is arranged on the moving platform 2, and the piezoelectric driver 4 is installed on the base 1. The piezoelectric driver 4 is connected to the moving platform 2, and the piezoelectric driver 4 is suitable for deformation to drive the moving platform 2 to move linearly relative to the base 1.

[0039] According to the variable divergence angle device of the embodiment of the present application, when the position of the focusing lens group 3 needs to be adjusted, the piezoelectric driver 4 is switched between deformation and recovery deformation, so that the piezoelectric driver 4 is used to drive the motion platform 2 to move, and the focusing lens group 3 installed on the motion platform 2 will move accordingly, and the movement of the motion platform 2 is driven by the deformation of the piezoelectric driver 4. The distance that the piezoelectric driver 4 can drive the motion platform 2 to move each time it deforms is small, thereby reducing the single movement distance of the focusing lens group 3, achieving high-precision adjustment of the focusing lens group 3, and no additional transmission mechanism or other components are required, simplifying the structure, reducing the size of the variable divergence angle device, and reducing the weight of the variable divergence angle device, so that the variable divergence angle device can meet the demand for lightweight. And because the piezoelectric driver 4 is connected to the motion platform 2, when the piezoelectric driver 4 is not working, the piezoelectric driver 4 can also limit the motion platform 2 to prevent the focusing lens group 3 from shifting.

[0040] It can be understood that the piezoelectric driver 4 is in contact with the motion platform 2, and there is friction between the piezoelectric driver 4 and the motion platform 2. When the piezoelectric driver 4 is deformed, the motion platform 2 can be driven to move. Specifically, when the piezoelectric driver 4 expands and deforms, the friction surface of the piezoelectric driver 4 is in close contact with the motion platform 2, which can drive the motion platform 2 to move. When the piezoelectric driver 4 shrinks and recovers its deformation, the friction surface of the piezoelectric driver 4 slides relative to the motion platform 2, thereby driving the motion platform 2 to move.

[0041] In one embodiment of the present application, the piezoelectric driving component 4 includes a piezoelectric material piece, which is installed on the base 1, the piezoelectric material piece is abutted against the moving platform 2, and the piezoelectric material piece is connected to the base 1 through a connecting component so that there is friction between the piezoelectric material piece and the moving platform 2.

[0042] It can be understood that when installing the piezoelectric material, the piezoelectric material is first abutted against the wall of the moving platform 2, and a certain pre-tightening force is applied to the piezoelectric material, and then the piezoelectric material is connected to the base 1 using the connecting assembly, ensuring that the piezoelectric material remains in close contact with the moving platform 2, ensuring that there is friction between the piezoelectric material and the moving platform 2 and that the friction is large enough.

[0043] It can be understood that the piezoelectric material piece will slowly expand after being compressed. Since the piezoelectric material piece is in contact with the moving platform 2, the piezoelectric material piece will drive the moving platform 2 to move when it expands. When the pressure applied to the piezoelectric material piece is removed, the piezoelectric material piece will shrink rapidly. When the piezoelectric material piece shrinks rapidly, the piezoelectric material piece will slide relative to the moving platform 2, thereby realizing the stepping of the moving platform 2 and the focusing lens group 3 installed on the moving platform 2.

[0044] It can be understood that when the piezoelectric material piece does not expand, the piezoelectric material piece abuts against the moving platform 2. At this time, there is friction between the piezoelectric material piece and the moving platform 2. The friction can prevent the movement of the moving platform 2, so that the moving platform 2 and the focusing lens group 3 installed on the moving platform 2 remain stable.

[0045] It can be understood that the displacement of the motion platform 2 driven by a single deformation of the piezoelectric material is approximately one thousandth of the size of the piezoelectric material itself, so that the single displacement distance of the motion platform 2 and the focusing lens group 3 installed on the motion platform 2 is very small, and a displacement resolution of hundreds of nanometers can be achieved.

[0046] Exemplarily, the piezoelectric driving element 4 may include a power source, which is connected to the piezoelectric material element. By applying a voltage to the piezoelectric material element through the power source, the piezoelectric material element may be deformed.

[0047] It is understandable that the connection component is, for example, at least two screws, and the two screws are respectively used to connect the two ends of the piezoelectric driver 4 and the base 1 so that the piezoelectric driver 4 is stably installed on the base 1.

[0048] In the embodiment of the present application, the friction force between the piezoelectric material piece and the motion platform 2 is, for example, 0.9N-1.1N.

[0049] It is understandable that the friction force between the piezoelectric material and the motion platform 2 is maintained at 0.9N-1.1N to ensure that the piezoelectric material can stably drive the motion platform 2 to move when it is deformed.

[0050] In the embodiment of the present application, the piezoelectric material piece is, for example, piezoelectric ceramic.

[0051] It should be understood that the piezoelectric material piece may also be a piezoelectric crystal or a piezoelectric polymer or any other suitable piezoelectric material structure piece.

[0052] In one embodiment of the present application, piezoelectric driving components 4 are provided on two oppositely disposed side walls of the motion platform 2 .

[0053] It is understandable that the piezoelectric driving components 4 on both sides of the motion platform 2 can simultaneously drive the motion platform 2 to move, so that the two sides of the motion platform 2 maintain synchronous displacement, ensuring that the motion platform 2 and the focusing lens group 3 installed on the motion platform 2 maintain linear movement.

[0054] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the variable divergence angle device includes a position detection component 5 , which is installed on the base 1 and is used to detect the position of the focusing lens group 3 .

[0055] It can be understood that the position of the focusing lens group 3 can be detected by the position detection component 5. When it is detected that the focusing lens group 3 moves to the specified position, the piezoelectric drive component 4 can be controlled to stop driving the motion platform 2 to move, so that the focusing lens group 3 can be accurately moved to the specified position, thereby realizing precise control of the movement of the focusing lens group 3.

[0056] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the position detection component 5 includes a scale 51 and a reading head 52. The scale 51 is mounted on the motion platform 2 or the focusing lens group 3. The reading head 52 is mounted on the base 1. The reading head 52 faces the scale 51. The reading head 52 is used to read the value of the scale 51.

[0057] It is understandable that when the piezoelectric drive 4 drives the motion platform 2 to move, the focusing lens group 3 will move accordingly. If the scale 51 is installed on the motion platform 2 or the focusing lens group 3, the scale 51 will also move synchronously with the focusing lens group 3. The reading head 52 can read the value of the scale 51, and then the displacement distance of the focusing lens group 3 can be accurately known. The displacement distance of the focusing lens group 3 can also be obtained by comparing the two values ​​before and after obtained by the reading head 52.

[0058] In one embodiment of the present application, Figure 1 and Figure 2 As shown, an installation space 6 is formed between the position detection component 5 and the motion platform 2 , and the piezoelectric drive component 4 is installed in the installation space 6 .

[0059] It can be understood that when the position detection component 5 is installed on the base 1, an installation space 6 is formed between the position detection component 5 and the motion platform 2, so that the piezoelectric drive component 4 can be installed in the installation space 6, making the structure of the variable divergence angle device more compact and reducing the size of the variable divergence angle device.

[0060] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the position detection component 5 and the piezoelectric drive component 4 are located on the same side of the motion platform 2 .

[0061] It is understandable that installing the position detection component 5 and the piezoelectric drive component 4 on the same side of the motion platform 2, that is, installing the detection component and the drive component on the same side of the motion platform 2, makes the structural layout of the variable divergence angle device more reasonable.

[0062] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the scale 51 and the piezoelectric drive element 4 are connected to the side wall surface of the motion platform 2.

[0063] It is understandable that the scale 51 is mounted on the side wall of the motion platform 2 so that the scale 51 can keep moving synchronously with the motion platform 2 to ensure that the value read by the reading head 52 can accurately represent the displacement of the focusing lens group 3. The piezoelectric driver 4 is connected to the side wall of the motion platform 2 to facilitate the connection between the piezoelectric driver 4 and the base 1, so that the piezoelectric driver 4 can be directly connected to the motion platform 2 while being mounted on the base 1.

[0064] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the moving straight line of the moving platform 2 coincides with the optical axis of the focusing lens group 3 .

[0065] It can be understood that the moving straight line of the motion platform 2 and the optical axis of the focusing lens group 3 are set to coincide, that is, the motion platform 2 moves along the optical axis, ensuring that the optical axis of the focusing lens group 3 does not change after the motion platform 2 drives the focusing lens group 3 to move.

[0066] Exemplarily, the coincidence of the moving straight line of the moving platform 2 and the optical axis of the focusing lens group 3 means that the deviation between the two does not exceed 50urad.

[0067] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the variable divergence angle device includes an optical fiber component 7, which is installed on a base 1. The optical fiber component 7 is arranged opposite to the focusing lens group 3. The piezoelectric drive component 4 is suitable for driving the motion platform 2 to move so that the focusing component is close to or away from the optical fiber component 7.

[0068] It can be understood that, by driving the motion platform 2 to move through the piezoelectric drive component 4, the focusing lens group 3 on the motion platform 2 will also move, so that the focusing lens group 3 will be close to or away from the light component, thereby adjusting the distance between the focusing lens group 3 and the light component, and finally achieving the adjustment of the divergence angle.

[0069] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the variable divergence angle device includes a fiber optic bracket 8 and a light shield 9. The optical fiber is installed on the base 1. The fiber optic component 7 and the light shield 9 are both installed on the fiber optic bracket 8. The light shield 9 is located between the fiber optic component 7 and the focusing lens group 3.

[0070] It is understandable that by providing a light shield 9 between the optical fiber assembly 7 and the focusing lens group 3, the light beam between the optical fiber assembly and the focusing lens group 3 will be transmitted in the light shield 9, which can prevent external light from affecting the transmission of the light beam.

[0071] In one embodiment of the present application, Figure 1 and Figure 2 As shown, the variable divergence angle device includes a guide rail 10 , which is installed on a base 1 , and a motion platform 2 is movably connected to the guide rail 10 .

[0072] It can be understood that the motion platform 2 is movably mounted on the guide rail 10 so that the motion platform 2 can move relative to the base 1 .

[0073] According to an embodiment of the second aspect of the present application, a laser communication terminal includes the above-mentioned variable divergence angle device.

[0074] According to the laser communication terminal of the embodiment of the present application, it has a variable divergence angle device, which reduces the single movement distance of the focusing lens group 3, realizes high-precision adjustment of the focusing lens group 3, and does not require additional transmission mechanisms and other components, simplifies the structure, reduces the size of the variable divergence angle device, and reduces the weight of the variable divergence angle device, so that the variable divergence angle device can meet the demand for lightweight.

[0075] Finally, it should be noted that the above implementation modes are only used to illustrate the present application, rather than to limit the present application. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A variable divergence angle device, characterized in that: include: Base; A motion platform, mounted on the base, and the motion platform can move relative to the base; A focusing lens assembly, arranged on the motion platform; A piezoelectric driver is mounted on the base, the piezoelectric driver is connected to the motion platform, and the piezoelectric driver is suitable for deforming to drive the motion platform to move linearly relative to the base; A position detection component, the position detection component is mounted on the base, the position detection component is used to detect the position of the focusing lens group; the position detection component includes a scale and a reading head, the scale is mounted on the motion platform or the focusing lens group, the reading head is mounted on the base, the reading head faces the scale, and the reading head is used to read the value of the scale; an installation space is formed between the position detection component and the motion platform, and the piezoelectric driver is installed in the installation space; the position detection component and the piezoelectric driver are located on the same side of the motion platform; the scale and the piezoelectric driver are connected to the side wall surface of the motion platform; The piezoelectric driving element includes a piezoelectric material element, the piezoelectric material element is mounted on the base, the piezoelectric material element abuts against the motion platform, and the piezoelectric material element is connected to the base through a connecting component so that there is friction between the piezoelectric material element and the motion platform; The variable divergence angle device comprises an optical fiber assembly, an optical fiber bracket and a light shield, wherein the optical fiber bracket is mounted on the base, the optical fiber assembly and the light shield are both mounted on the optical fiber bracket, and the light shield is located between the optical fiber assembly and the focusing lens group; The variable divergence angle device comprises a guide rail, the guide rail is installed on the base, and the motion platform is movably connected to the guide rail.

2. The variable divergence angle device according to claim 1, characterized in that: The friction force between the piezoelectric material piece and the motion platform is 0.9N-1.1N.

3. The variable divergence angle device according to any one of claims 1 to 2, characterized in that: The moving straight line of the moving platform coincides with the optical axis of the focusing lens group.

4. The variable divergence angle device according to any one of claims 1 to 2, characterized in that: The optical fiber assembly is arranged opposite to the focusing lens group, and the piezoelectric driving component is suitable for driving the motion platform to move so that the focusing lens group is close to or away from the optical fiber assembly.

5. A laser communication terminal, characterized in that: It comprises the variable divergence angle device as described in any one of claims 1 to 4.

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