Lissajous optical fiber scanner with supporting plate
By introducing a support plate and overlapping part into the Lissajous scanner, the natural frequency difference was adjusted, the vibration coupling problem was solved, the scanning effect and processing efficiency were improved, and the yield was increased.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-03-06
AI Technical Summary
When the natural frequencies used by a Lissajous scanner in two directions are close, vibration coupling effects are likely to occur, leading to distortion of the scanning trajectory and making it difficult to guarantee processing accuracy and yield.
Design a Lissajous fiber optic scanner with a support plate. By adjusting the shape and size parameters of the support plate and the overlapping part, the natural frequencies of the combined part in both directions are close yet have a sufficient difference, avoiding vibration coupling and allowing the natural frequencies of the cylindrical body to be the same or close in both directions, thus reducing the difficulty of processing.
It achieves excellent scanning results and a uniform and dense scanning grid, while reducing processing difficulty and improving yield.
Smart Images
Figure CN223977437U_ABST
Abstract
Description
[0001] This application is a divisional application of Chinese Patent Application No. 2024232650214, filed with the Chinese Patent Office on December 30, 2024, entitled "A Lissajous Fiber Optic Scanner with a Support Plate", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of fiber optic scanner structure technology, and more particularly to a Lissajous fiber optic scanner with a support plate. Background Technology
[0003] A fiber optic scanner is a display technology that uses a scanning driver to control the oscillation of an optical fiber while simultaneously emitting light. It is primarily used in fiber optic scanning display technology, fiber optic scanning endoscopy technology, and fiber optic scanning radar. When applied to image display, fiber optic scanners produce images with sharp, saturated colors, high contrast, high brightness, and a very small structural size.
[0004] Fiber optic scanners utilize the principle of mechanical resonance to enable a large scanning range for the fiber optic cantilever. Scanning methods of the scanning driver can be categorized into helical scanning, grid scanning, and Lissajous scanning. Lissajous scanning micro-piezoelectric scanning devices typically have driving sections in two directions, driving the scanning device to vibrate simultaneously in both directions. In Lissajous scanning, the closer the driving frequencies in the two directions, the closer the uniformity (density) of the scanning grid in both directions. Theoretically, the closer the driving frequencies in these two directions, the better. However, the closer the natural frequencies used by the scanner in the two directions, the more pronounced the vibration coupling effect becomes, which degrades the scanning trajectory, causing uncontrolled components in the scanning trajectory and resulting in image distortion that is difficult to completely eliminate through post-processing. Therefore, the natural frequencies used by the Lissajous scanner in the two directions should ideally have a precise difference range, avoiding both excessively small differences that cause coupling effects and excessively large differences that lead to unsatisfactory uniformity.
[0005] The manufacturing of Lissajous scanners, which utilize the inherent frequencies in both directions with precise differences, requires extremely high processing accuracy, making it difficult to guarantee both the cost of processing equipment and the yield rate. Utility Model Content
[0006] This application provides a Lissajous fiber optic scanner with a support plate to reduce processing difficulty and improve processing yield.
[0007] To achieve the aforementioned objectives, this application provides a Lissajous fiber optic scanner with a support plate, comprising a cylindrical body, a support plate fixedly connected to the cylindrical body, and an optical fiber fixedly mounted on the support plate in a cantilevered manner.
[0008] With the axial extension direction of the cylindrical body as the front-to-back direction, the rear end of the cylindrical body is fixedly connected to the base for support. At least one of the left and right sides of the cylindrical body is provided with a first piezoelectric plate, and the extension and retraction of the first piezoelectric plate drives the front end of the cylindrical body to vibrate left and right in the horizontal direction.
[0009] At least one of the upper and lower sides of the cylindrical body is provided with a second piezoelectric plate, and the extension and retraction of the second piezoelectric plate drives the front end of the cylindrical body to vibrate in the vertical direction.
[0010] The support plate is arranged parallel to the horizontal plane and is located on the front side of the cylindrical body. The left and right walls of the cylindrical body are provided with mounting grooves for connecting the support plate. The rear part of the support plate is fixedly inserted into the mounting groove, that is, the rear part of the support plate is inserted into the mounting groove and fixedly connected to the cylindrical body. The optical fiber is fixedly provided with the front end of the support plate in a cantilever support manner. The part of the support plate installed in the mounting groove and the part of the cylindrical body that overlaps with this part of the support plate in the front-back direction form an overlapping part. The support plate and the overlapping part make the natural frequency of the combination part composed of the cylindrical body, the first piezoelectric sheet, the second piezoelectric sheet, the support plate and the optical fiber in the horizontal direction greater than the natural frequency of the same order in the vertical direction of the combination part, and make the U-order natural frequency of the combination part in the vertical direction, which is closest to its V-order natural frequency in the horizontal direction, have a difference with the V-order natural frequency in the horizontal direction.
[0011] Optionally, V can be an integer greater than 1, and U can be an integer greater than V.
[0012] Specifically, by adjusting the shape and / or size parameters of the support plate and the overlapping part, the natural frequencies of the combined part used in both directions are made to be sufficiently close to ensure good scanning effect and have a uniform and dense scanning grid; at the same time, they have sufficient difference so that the vibration of the combined part in the two directions will not couple.
[0013] The difference value ensures that when the piezoelectric actuator performs a Lissajous scan under the drive signal, the vibrations of the combined unit in the horizontal and vertical directions do not couple. Generally, the difference value ranges from 10Hz to 12kHz. More preferably, the difference value ranges from 1kHz to 10kHz. Specifically, it is selected based on the V-order natural frequency of the scanner arm in the horizontal direction. The difference value is sufficient to ensure that the scanner arm has sufficient amplitude when the piezoelectric actuator performs a Lissajous scan under drive, and that the vibrations of the scanner arm in the horizontal and vertical directions do not couple. For those skilled in the art, selecting values based on the above description is a conventional technique in the field.
[0014] Optionally, the mounting groove can be located in the middle, upper or lower part of the left and right side walls of the cylindrical body in the vertical direction, without limitation.
[0015] Optionally, the natural frequency of the cylindrical body in the horizontal direction is the same as or similar to the natural frequency of the same order in the vertical direction.
[0016] Furthermore, the piezoelectric sheet attached to the outer or inner surface of the cylindrical body is a flat piezoelectric sheet or an arc-shaped piezoelectric sheet whose shape matches the outer or inner surface of the cylindrical body.
[0017] Optionally, a first piezoelectric sheet is provided on either the left or right side of the cylindrical body, and the extension and retraction of the first piezoelectric sheet drives the front end of the cylindrical body to vibrate horizontally. The number of first piezoelectric sheets can be one, two, or more. When there are two or more first piezoelectric sheets, each first piezoelectric sheet extends and retracts synchronously and at the same length.
[0018] Alternatively, a first piezoelectric sheet is provided on both the left and right sides of the cylindrical body. The first piezoelectric sheet on the left side and the first piezoelectric sheet on the right side extend and retract synchronously in opposite directions with equal length, driving the front end of the cylindrical body to vibrate horizontally from side to side. The number of first piezoelectric sheets on the same side can be one, two, or more. When there are two or more first piezoelectric sheets on the same side, the first piezoelectric sheets on the same side extend and retract synchronously with equal length.
[0019] Optionally, a second piezoelectric element is provided on either the upper or lower side of the cylindrical body. The extension and retraction of the second piezoelectric element drives the front end of the cylindrical body to vibrate vertically. The number of second piezoelectric elements can be one, two, or more. When there are two or more second piezoelectric elements, the second piezoelectric elements extend and retract synchronously and at the same length.
[0020] Alternatively, second piezoelectric plates are provided on both the upper and lower sides of the cylindrical body. The second piezoelectric plate on the upper side and the second piezoelectric plate on the lower side extend and retract synchronously in opposite directions with equal length, driving the front end of the cylindrical body to vibrate vertically up and down. The number of second piezoelectric plates on the same side can be one, two, or more. When there are two or more second piezoelectric plates on the same side, the second piezoelectric plates on the same side extend and retract synchronously with equal length.
[0021] Optionally, the surface on which the first or second piezoelectric sheet is disposed of on the cylindrical body can be either the inner surface or the outer surface of the cylindrical body.
[0022] More preferably, when the first piezoelectric sheet is provided on both the left and right sides of the cylindrical body, the first piezoelectric sheet on the left and right sides of the cylindrical body is symmetrically arranged so as to drive the cylindrical body to vibrate accurately in the horizontal direction without generating a displacement component in the vertical direction; when the second piezoelectric sheet is provided on both the upper and lower sides of the cylindrical body, the second piezoelectric sheet on the upper and lower sides of the cylindrical body is symmetrically arranged so as to drive the cylindrical body to vibrate accurately in the vertical direction without generating a displacement component in the horizontal direction.
[0023] One or more technical solutions in this application have at least the following technical effects or advantages:
[0024] This application utilizes the adjustment of the shape and / or size parameters of the support plate and the overlapping part to ensure that the natural frequencies of the combined part used in both directions are sufficiently close to guarantee good scanning effect and have a uniform and dense scanning grid; at the same time, they have sufficient difference so that the vibration of the combined part in both directions will not couple.
[0025] This application eliminates the need for a specific difference in the natural frequencies of the piezoelectric actuator in the two driving directions of the Lissajous scanner, thus avoiding coupling of vibrations in the two driving directions and reducing the requirements for processing difficulty and precision. More preferably, this application allows the cylindrical body to have the same or similar natural frequencies in the two driving directions, and allows the cylindrical body itself to be a rotationally symmetric structure. This further reduces the processing difficulty of the piezoelectric actuator in the Lissajous scanner, resulting in a significant improvement in processing efficiency and yield. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of this utility model;
[0027] Figure 2 This is a schematic diagram of the overlapping structure between the support plate and the cylindrical body in the front-to-back direction.
[0028] Figure 3 This is a schematic diagram of another embodiment of the present invention. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example
[0030] like Figure 1 , Figure 2As shown, a Lissajous fiber optic scanner with a support plate includes a cylindrical body 100, a support plate 103 fixedly connected to the cylindrical body 100, and an optical fiber 104 fixedly mounted on the support plate 103 in a cantilevered manner.
[0031] With the axial extension direction of the cylindrical body 100 as the front-rear direction, the rear end of the cylindrical body 100 is fixedly connected to the base 200 for support. At least one of the left and right sides of the cylindrical body 100 is provided with a first piezoelectric sheet 101. The extension and retraction of the first piezoelectric sheet 101 drives the front end of the cylindrical body 100 to vibrate left and right in the horizontal direction.
[0032] At least one of the upper and lower sides of the cylindrical body 100 is provided with a second piezoelectric sheet 102, and the extension and retraction of the second piezoelectric sheet 102 drives the front end of the cylindrical body 100 to vibrate in the vertical direction.
[0033] The support plate 103 is arranged parallel to the horizontal plane, located on the front side of the cylindrical body 100, and its rear end is fixedly connected to the cylindrical body 100.
[0034] The left and right sides of the cylindrical body 100 are provided with mounting grooves 106 for connecting the support plate 103. The rear end portion of the support plate 103 is inserted into the mounting grooves 106 and fixedly connected to the cylindrical body 100.
[0035] The front end of the optical fiber 104 is fixedly mounted on the support plate 103 in a cantilever support manner. The support plate 103 and the cylindrical body 100 have an overlapping part 105 in the front-rear direction. The support plate 103 and the overlapping part 105 make the natural frequency of the combination part composed of the cylindrical body 100, the first piezoelectric sheet 101, the second piezoelectric sheet 102, the support plate 103 and the optical fiber 104 in the horizontal direction greater than the natural frequency of the same order in the vertical direction. It also makes the natural frequency of the combination part in the vertical direction that is closest to its natural frequency of V in the horizontal direction have a difference with the natural frequency of V in the horizontal direction, where V is an integer greater than or equal to 1.
[0036] The assembly has first-order, second-order, third-order, ... N-order natural frequencies in the vertical direction. Among them, a certain natural frequency (e.g., U-order, where U is an integer greater than or equal to 2) is closest to the V-order natural frequency of the assembly in the horizontal direction (V is less than the first-order natural frequency U). In Lissajous scanning, the closer the driving frequencies in the two directions are, the closer the uniformity (density) of the scanning grid in the two directions will be. The more sampling points, the better, theoretically. However, the closer the natural frequencies used by the assembly in the two directions are, the more obvious the coupling effect will be. Therefore, this application uses the shape structure and / or size parameters of the support plate 103 and the overlapping part 105 to make the natural frequencies of the assembly used in the two directions both close enough to ensure good scanning effect and a uniform and dense scanning grid, and have enough difference so that the vibration of the assembly in the two directions will not couple.
[0037] The difference ensures that when the piezoelectric actuator performs a Lissajous scan under the drive signal, the vibration of the assembly in the horizontal direction and the vibration in the vertical direction will not be coupled.
[0038] Generally, the difference ranges from 10Hz to 12kHz. More preferably, the difference ranges from 1kHz to 10kHz. Specifically, the difference is selected based on the V-order natural frequency of the scanner arm in the horizontal direction. The difference is sufficient to ensure that the scanner arm has sufficient amplitude when the piezoelectric actuator performs a Lissajous scan under drive, and that the vibrations of the scanner arm in the horizontal and vertical directions do not couple. For those skilled in the art, selecting values based on the above description is a conventional technique in the field.
[0039] Preferably, the natural frequency of the cylindrical body 100 in the horizontal direction is the same or similar to the natural frequency of the same order in the vertical direction. The cylindrical body 100 that meets this requirement has a regular shape and a rotationally symmetrical structure, which makes the cylindrical body 100 easy to process, easy to control the processing error, and has a high yield rate, such as a cylindrical body or a square cylindrical body.
[0040] Optionally, the mounting groove 106 may be located in the middle, upper or lower part of the left and right side walls of the cylindrical body 100 in the vertical direction, without limitation.
[0041] Optional, such as Figure 1 As shown, the cylindrical body 100 has the same natural frequency in the horizontal direction and the same natural frequency in the vertical direction. Its outer contour is square, and its interior is provided with a central hole with a square or circular contour that is coaxial with the outer contour.
[0042] Alternatively, such as Figure 3As shown, the cylindrical body 100 has the same natural frequency in the horizontal direction and the same natural frequency in the vertical direction. Its outer contour is circular, and its interior is provided with a central hole with a square or circular contour that is coaxial with the outer contour.
[0043] In this embodiment, the piezoelectric sheet attached to the outer or inner surface of the cylindrical body 100 is a flat piezoelectric sheet or an arc-shaped piezoelectric sheet whose shape matches the outer or inner surface of the cylindrical body 100, and is selected adaptively according to the specific working conditions.
[0044] Optionally, a first piezoelectric sheet 101 is provided on either the left or right side of the cylindrical body 100, and the extension and retraction of the first piezoelectric sheet 101 drives the front end of the cylindrical body 100 to vibrate left and right in the horizontal direction. The number of first piezoelectric sheets 101 can be one, two, or more. When there are two or more first piezoelectric sheets 101, each first piezoelectric sheet 101 extends and retracts synchronously and at the same length.
[0045] Optionally, a first piezoelectric sheet 101 is provided on both the left and right sides of the cylindrical body 100. The first piezoelectric sheet 101 on the left side and the first piezoelectric sheet 101 on the right side extend and retract synchronously in opposite directions with equal length, driving the front end of the cylindrical body 100 to vibrate horizontally. The number of first piezoelectric sheets 101 on the same side can be one, two, or more. When there are two or more first piezoelectric sheets 101 on the same side, the first piezoelectric sheets 101 on the same side extend and retract synchronously with equal length.
[0046] Optionally, a second piezoelectric sheet 102 is provided on either the upper or lower side of the cylindrical body 100, and the extension and retraction of the second piezoelectric sheet 102 drives the front end of the cylindrical body 100 to vibrate vertically. The number of second piezoelectric sheets 102 can be one, two, or more. When there are two or more second piezoelectric sheets 102, the second piezoelectric sheets 102 extend and retract synchronously and at the same length.
[0047] Alternatively, a second piezoelectric sheet 102 may be provided on both the upper and lower sides of the cylindrical body 100. The second piezoelectric sheet 102 on the upper side and the second piezoelectric sheet 102 on the lower side extend and retract synchronously in opposite directions with equal length, driving the front end of the cylindrical body 100 to vibrate vertically up and down. The number of second piezoelectric sheets 102 on the same side can be one, two, or more. When there are two or more second piezoelectric sheets 102 on the same side, the second piezoelectric sheets 102 on the same side extend and retract synchronously with equal length.
[0048] Optionally, the surface on which the first piezoelectric sheet 101 or the second piezoelectric sheet 102 is disposed of in the cylindrical body 100 can be either the inner surface or the outer surface of the cylindrical body 100.
[0049] More preferably, when the first piezoelectric sheet 101 is provided on both the left and right sides of the cylindrical body 100, the first piezoelectric sheet 101 on the left and right sides of the cylindrical body 100 is symmetrically arranged so as to drive the cylindrical body 100 to vibrate accurately in the horizontal direction without generating a displacement component in the vertical direction; when the second piezoelectric sheet 102 is provided on both the upper and lower sides of the cylindrical body 100, the second piezoelectric sheet 102 on the upper and lower sides of the cylindrical body 100 is symmetrically arranged so as to drive the cylindrical body 100 to vibrate accurately in the vertical direction without generating a displacement component in the horizontal direction.
[0050] This application eliminates the need for the piezoelectric actuator of the Lissajous scanner to have a specific difference in its natural frequency in the two driving directions, thus avoiding coupling of vibrations in the two driving directions and reducing the processing difficulty and accuracy requirements. More preferably, this application allows the cylindrical body 100 to have the same or similar natural frequencies in the two driving directions, and allows the cylindrical body 100 itself to be a rotationally symmetric structure. This further reduces the processing difficulty of the piezoelectric actuator of the Lissajous scanner, resulting in a significant improvement in processing efficiency and yield. Example
[0051] like Figure 1 , Figure 2 As shown, a Lissajous fiber optic scanner with a support plate includes a cylindrical body 100, a support plate 103 fixedly connected to the cylindrical body 100, and an optical fiber 104 fixedly mounted on the support plate 103 in a cantilevered manner.
[0052] With the axial extension direction of the cylindrical body 100 as the front-rear direction, the rear end of the cylindrical body 100 is fixedly connected to the base 200 for support. At least one of the left and right sides of the cylindrical body 100 is provided with a first piezoelectric sheet 101. The extension and retraction of the first piezoelectric sheet 101 drives the front end of the cylindrical body 100 to vibrate left and right in the horizontal direction.
[0053] At least one of the upper and lower sides of the cylindrical body 100 is provided with a second piezoelectric sheet 102, and the extension and retraction of the second piezoelectric sheet 102 drives the front end of the cylindrical body 100 to vibrate in the vertical direction.
[0054] The cylindrical body 100 has the same natural frequency in the horizontal direction and the same natural frequency in the vertical direction. Its outer contour is square, and its interior is provided with a central hole with a square or circular contour that is coaxial with the outer contour.
[0055] A support plate 103 is arranged parallel to the horizontal plane, located at the front of the cylindrical body 100, and its rear end is fixedly connected to the cylindrical body 100. The support plate 103 and the cylindrical body 100 have an overlapping portion 105 in the front-rear direction. The left and right sides of the cylindrical body 100 are provided with mounting grooves 106 for connecting the support plate 103. The rear end portion of the support plate 103 is inserted into the mounting groove 106 and fixedly connected to the cylindrical body 100. The optical fiber 104 is fixedly mounted on the front end of the support plate 103 in a cantilever support manner. The support plate 103 is installed on the mounting... The portion within the groove 106 and the portion of the cylindrical body 100 that overlaps with the supporting plate 103 in the front-rear direction form an overlapping portion 105. The supporting plate 103 and the overlapping portion 105 ensure that the natural frequency of the assembly consisting of the cylindrical body 100, the first piezoelectric sheet 101, the second piezoelectric sheet 102, the supporting plate 103, and the optical fiber 104 is greater in the horizontal direction than the same-order natural frequency in the vertical direction. Furthermore, the U-order natural frequency, which is closest to the V-order natural frequency in the vertical direction, has a difference from the V-order natural frequency in the horizontal direction. In this embodiment, V is first-order and U is second-order. Of course, this is only the parameter selection for this embodiment; in other embodiments with similar structures, V can also be an integer greater than 1, and U can be an integer greater than V.
[0056] Specifically, by adjusting the shape and / or size parameters of the support plate 103 and the overlapping part 105, the natural frequencies of the combined part used in both directions are simultaneously close enough to ensure good scanning effect and have a uniform and dense scanning grid; at the same time, they have a sufficient difference so that the vibration of the combined part in both directions will not couple.
[0057] The difference value ensures that when the piezoelectric actuator performs a Lissajous scan under the drive signal, the vibrations of the combined unit in the horizontal and vertical directions do not couple. Generally, the difference value ranges from 10Hz to 12kHz. More preferably, the difference value ranges from 1kHz to 10kHz. Specifically, it is selected based on the V-order natural frequency of the scanner arm in the horizontal direction. The difference value is sufficient to ensure that the scanner arm has sufficient amplitude when the piezoelectric actuator performs a Lissajous scan under drive, and that the vibrations of the scanner arm in the horizontal and vertical directions do not couple. For those skilled in the art, selecting values based on the above description is a conventional technique in the field.
[0058] Optionally, the mounting groove 106 may be located in the middle, upper or lower part of the left and right side walls of the cylindrical body 100 in the vertical direction, without limitation.
[0059] In this embodiment, the first piezoelectric element 101 and the second piezoelectric element 102 are configured in the same way as in embodiment 1. Example
[0060] like Figure 3 , Figure 2 As shown, a Lissajous fiber optic scanner with a support plate includes a cylindrical body 100, a support plate 103 fixedly connected to the cylindrical body 100, and an optical fiber 104 fixedly mounted on the support plate 103 in a cantilevered manner.
[0061] With the axial extension direction of the cylindrical body 100 as the front-rear direction, the rear end of the cylindrical body 100 is fixedly connected to the base 200 for support. At least one of the left and right sides of the cylindrical body 100 is provided with a first piezoelectric sheet 101. The extension and retraction of the first piezoelectric sheet 101 drives the front end of the cylindrical body 100 to vibrate left and right in the horizontal direction.
[0062] At least one of the upper and lower sides of the cylindrical body 100 is provided with a second piezoelectric sheet 102, and the extension and retraction of the second piezoelectric sheet 102 drives the front end of the cylindrical body 100 to vibrate in the vertical direction.
[0063] The cylindrical body 100 has the same natural frequency in the horizontal direction and the same natural frequency in the vertical direction. Its outer contour is circular, and its interior is provided with a central hole with a square or circular contour that is coaxial with the outer contour.
[0064] A support plate 103 is arranged parallel to the horizontal plane, located at the front of the cylindrical body 100, and its rear end is fixedly connected to the cylindrical body 100. An optical fiber 104 is fixedly mounted on the front end of the support plate 103 using a cantilever support method. The support plate 103 and the cylindrical body 100 have an overlapping portion 105 in the front-rear direction. Both the left and right sides of the cylindrical body 100 are provided with mounting grooves 106 for connecting the support plate 103. The rear end portion of the support plate 103 is inserted into the mounting groove 106 and fixedly connected to the cylindrical body 100. The support plate 103 is installed on the mounting... The portion within the groove 106 and the portion of the cylindrical body 100 that overlaps with the supporting plate 103 in the front-rear direction form an overlapping portion 105. The supporting plate 103 and the overlapping portion 105 ensure that the natural frequency of the assembly consisting of the cylindrical body 100, the first piezoelectric sheet 101, the second piezoelectric sheet 102, the supporting plate 103, and the optical fiber 104 is greater in the horizontal direction than the same-order natural frequency in the vertical direction. Furthermore, the U-order natural frequency, which is closest to the V-order natural frequency in the vertical direction, has a difference from the V-order natural frequency in the horizontal direction. In this embodiment, V is first-order and U is second-order. Of course, this is only the parameter selection for this embodiment; in other embodiments with similar structures, V can also be an integer greater than 1, and U can be an integer greater than V.
[0065] Specifically, by adjusting the shape and / or size parameters of the support plate 103 and the overlapping part 105, the natural frequencies of the combined part used in both directions are simultaneously close enough to ensure good scanning effect and have a uniform and dense scanning grid; at the same time, they have a sufficient difference so that the vibration of the combined part in both directions will not couple.
[0066] The difference value ensures that when the piezoelectric actuator performs a Lissajous scan under the drive signal, the vibrations of the combined unit in the horizontal and vertical directions do not couple. Generally, the difference value ranges from 10Hz to 12kHz. More preferably, the difference value ranges from 1kHz to 10kHz. Specifically, it is selected based on the V-order natural frequency of the scanner arm in the horizontal direction. The difference value is sufficient to ensure that the scanner arm has sufficient amplitude when the piezoelectric actuator performs a Lissajous scan under drive, and that the vibrations of the scanner arm in the horizontal and vertical directions do not couple. For those skilled in the art, selecting values based on the above description is a conventional technique in the field.
[0067] Optionally, the mounting groove 106 may be located in the middle, upper or lower part of the left and right side walls of the cylindrical body 100 in the vertical direction, without limitation.
[0068] In this embodiment, the piezoelectric sheet attached to the outer or inner surface of the cylindrical body 100 is a flat piezoelectric sheet or an arc-shaped piezoelectric sheet whose shape matches the outer or inner surface of the cylindrical body 100, and is selected adaptively according to specific working conditions. Based on this, the arrangement of the first piezoelectric sheet 101 and the second piezoelectric sheet 102 in this embodiment is the same as in Embodiment 1.
[0069] It should be noted that the above embodiments are illustrative of this application and not limiting of it, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The words “comprising” or “including” do not exclude the presence of elements or steps not listed in the claims. The words “a” or “an” preceding an element do not exclude the presence of a plurality of such elements. The use of the words first, second, and third, etc., does not indicate any order and these words can be interpreted as names.
[0070] All features disclosed in this specification, except for mutually exclusive features, can be combined in any way.
[0071] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.
[0072] This application is not limited to the specific embodiments described above. This application extends to any new features or combinations disclosed in this specification, as well as any new steps or combinations of any new methods or processes disclosed.
Claims
1. A Lissajous fiber scanner with a support plate, characterized in that, The cylinder body, the support plate and the optical fiber, The axis of the cylinder body is taken as the front-rear direction, the rear end of the cylinder body is fixedly connected with the base to be supported by the base, at least one side of the left and right sides of the cylinder body is provided with a first piezoelectric sheet, and the front end of the cylinder body is driven to vibrate left and right along the horizontal direction by the expansion and contraction of the first piezoelectric sheet, At least one side of the upper and lower sides of the cylinder body is provided with a second piezoelectric sheet, and the front end of the cylinder body is driven to vibrate along the vertical direction by the expansion and contraction of the second piezoelectric sheet, The support plate is arranged along the horizontal direction, the left and right side walls of the cylinder body are each provided with a mounting groove for connecting the support plate, and the rear end of the support plate is fixedly inserted into the mounting groove, the optical fiber is fixedly arranged at the front end of the support plate in a cantilever support manner, the part of the support plate inserted into the mounting groove and the part of the cylinder body coinciding with the part of the support plate in the front-rear direction form a coinciding part, the support plate and the coinciding part make the inherent frequency of the combination of the cylinder body, the first piezoelectric sheet, the second piezoelectric sheet, the support plate and the optical fiber in the horizontal direction greater than the same order inherent frequency of the combination in the vertical direction, and make the combination have a difference between the U order inherent frequency closest to the V order inherent frequency in the horizontal direction and the V order inherent frequency in the vertical direction, V is an integer greater than 1, and U is an integer greater than V.
2. A Lissajous fiber scanner with a support plate as claimed in claim 1, characterized in that, The difference satisfies that when the piezoelectric actuating part is driven to perform Lissajous scanning under the driving of the driving signal, the vibration of the combination in the horizontal direction and the vibration in the vertical direction do not couple.
3. A Lissajous fiber scanner with a support plate as claimed in claim 2, characterized in that, The difference ranges from 10 Hz to 12 KHz.
4. A Lissajous fiber scanner with a support plate as claimed in claim 3, characterized in that, The difference ranges from 1 KHz to 10 KHz.
5. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, The inherent frequency of the cylinder body in the horizontal direction and the same order inherent frequency in the vertical direction are the same or close.
6. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, Either side of the left and right sides of the cylinder body is provided with the first piezoelectric sheet, or Both sides of the left and right sides of the cylinder body are provided with the first piezoelectric sheet.
7. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that Either side of the upper and lower sides of the cylinder body is provided with the second piezoelectric sheet, or Both sides of the upper and lower sides of the cylinder body are provided with the second piezoelectric sheet.
8. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, The surface of the cylinder body provided with the first piezoelectric sheet or the second piezoelectric sheet is the inner surface of the cylinder body, or The surface of the cylinder body provided with the first piezoelectric sheet or the second piezoelectric sheet is the outer surface of the cylinder body.
9. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, When both sides of the left and right sides of the cylinder body are provided with the first piezoelectric sheet, the first piezoelectric sheets on the left and right sides of the cylinder body are symmetrically arranged, and when both sides of the upper and lower sides of the cylinder body are provided with the second piezoelectric sheet, the second piezoelectric sheets on the upper and lower sides of the cylinder body are symmetrically arranged.