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, and efficient scanning effect and yield improvement were achieved.
Patent Information
- Application Number
- CN202520592668.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-12-30
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 two directions are both close and have sufficient difference, thus avoiding vibration coupling and reducing the difficulty of processing.
A uniform and dense scanning mesh was achieved, avoiding vibration coupling and improving processing efficiency and yield.
Smart Images
Figure CN223883852U_ABST
Abstract
Description
[0001] This application is a divisional application of the Chinese patent application No. 2024232650214, filed on December 30, 2024, with the State Intellectual Property Office of China, and entitled "Lissajous Fiber Scanner with Support Plate", the whole content of which is incorporated herein by reference. TECHNICAL FIELD
[0002] The present application relates to the technical field of fiber scanner structure, in particular to a Lissajous fiber scanner with a support plate. BACKGROUND
[0003] The fiber scanner is a display technology that uses a scanning driver to control the swing of a fiber while the fiber emits light rays. It is mainly used in the technical fields of fiber scanning display technology, fiber scanning endoscope technology, fiber scanning radar, etc. When the fiber scanner is applied to image display, the color of the pattern illuminated by this technology is sharp and saturated, the contrast is high, the brightness is high, and the structure is very small.
[0004] The fiber scanner uses the principle of mechanical resonance to make the fiber cantilever achieve a large scanning range. The scanning mode of the scanning driver can be divided into spiral scanning, grid scanning and Lissajous scanning. The miniature piezoelectric scanning device of Lissajous scanning generally has two driving parts, which drive the scanning device to vibrate in two directions at the same time. The closer the driving frequencies of the two directions in Lissajous scanning, the closer the uniformity (density) of the scanning grid in the two directions, and theoretically the closer the driving frequencies of the two directions, the better. However, the closer the inherent frequencies used in the two directions of the scanner, the more obvious the vibration coupling effect will be, which will worsen the scanning trajectory, cause uncontrollable components in the scanning trajectory and result in distortion of the scanning image, which is difficult to completely eliminate through post-processing. Therefore, the inherent frequencies used in the two directions of the Lissajous scanner should have a precise difference range, neither too small to cause coupling effect, nor too large to cause non-uniformity.
[0005] However, the Lissajous scanner that processes and manufactures inherent frequencies with a precise difference in the two directions requires extremely high processing precision, and both the cost of processing equipment and the yield cannot be guaranteed. Practical new type content
[0006] The present application provides a Lissajous fiber scanner with a support plate to reduce the processing difficulty and improve the processing yield.
[0007] In order to achieve the above-mentioned application purpose, the present application provides a Lissajous fiber scanner with a support plate, which comprises a cylindrical body, a support plate fixedly connected with the cylindrical body, and a fiber fixedly arranged on the support plate in a cantilever support manner,
[0008] The axis extension direction of the cylinder body is regarded 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,
[0009] 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.
[0010] The support plate is arranged along the direction parallel to the horizontal plane, and is located at the front side of the cylinder body, and the part of the rear end thereof is attached to the upper surface or the lower surface of the cylinder body and is fixedly connected with the cylinder body, the surface of the cylinder body for attaching the support plate is a plane, 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 attached to the cylinder body 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 part composed 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 frequency inherent frequency of the combination part in the vertical direction, and make the combination part in the vertical direction closest to the U-order inherent frequency between the V-order inherent frequency in the horizontal direction and the V-order inherent frequency in the horizontal direction, V is an integer greater than 1, and U is an integer greater than V.
[0011] Specifically, the shape structure and / or size parameter of the support plate and the coinciding part are adjusted, so that the inherent frequencies of the combination part used in the two directions simultaneously meet both close enough to ensure good scanning effect and have uniform and dense scanning grid, and also have sufficient difference to make the vibration of the combination part in the two directions not coupled.
[0012] Preferably, the inherent frequency of the cylinder body in the horizontal direction and the same order inherent frequency in the vertical direction are the same. Optionally, the outer contour is a square, and a center hole with a square or circular contour coaxial with the outer contour is arranged in the inside. Of course, this is not limited, for example, the outer surface is a substantially cylindrical surface, and several planes are arranged in rotational symmetry, one of which is used to attach the support plate.
[0013] The difference satisfies that when the piezoelectric actuating part makes Lissajous scanning under the driving of the driving signal, the vibration of the combination part in the horizontal direction and the vibration in the vertical direction do not generate coupling. Generally, the difference ranges from 10 Hz to 12 KHz. Further preferably, the difference ranges from 1 KHz to 10 KHz. The difference is selected according to the value of the V-order natural frequency of the scanner cantilever in the horizontal direction, as long as the difference satisfies that when the piezoelectric actuating part makes Lissajous scanning under the driving, the scanner cantilever has sufficient amplitude, and the vibration of the scanner cantilever in the horizontal direction and the vibration in the vertical direction do not generate coupling. For those skilled in the art, numerical selection according to the above description is a conventional technical means in the art.
[0014] In the embodiment, the piezoelectric sheet attached to the outer surface or the inner surface of the cylindrical body is a flat plate type piezoelectric sheet or an arc-shaped piezoelectric sheet which is matched with the shape of the outer surface or the inner surface of the cylindrical body, and is adaptively selected according to specific working conditions.
[0015] Optionally, any one side of the left and right sides of the cylindrical body is provided with a first piezoelectric sheet, and the front end of the cylindrical body is driven to vibrate left and right in the horizontal direction by the expansion and contraction of the first piezoelectric sheet. The number of the first piezoelectric sheets can be one, two or more. When the number of the first piezoelectric sheets is two or more, each first piezoelectric sheet synchronously and equally expands and contracts.
[0016] Optionally, the left and right sides of the cylindrical body are both provided with first piezoelectric sheets, and the first piezoelectric sheet on the left side and the first piezoelectric sheet on the right side synchronously and equally expand and contract in the opposite direction, driving the front end of the cylindrical body to vibrate left and right in the horizontal direction. The number of the first piezoelectric sheets on the same side can be one, two or more. When the number of the first piezoelectric sheets on the same side is two or more, the first piezoelectric sheets on the same side synchronously and equally expand and contract.
[0017] Optionally, any one side of the upper and lower sides of the cylindrical body is provided with a second piezoelectric sheet, and the front end of the cylindrical body is driven to vibrate up and down in the vertical direction by the expansion and contraction of the second piezoelectric sheet. The number of the second piezoelectric sheets can be one, two or more. When the number of the second piezoelectric sheets is two or more, the second piezoelectric sheets synchronously and equally expand and contract.
[0018] Optionally, the upper and lower sides of the cylindrical body are both provided with second piezoelectric sheets, and the second piezoelectric sheet on the upper side and the second piezoelectric sheet on the lower side synchronously and equally expand and contract in the opposite direction, driving the front end of the cylindrical body to vibrate up and down in the vertical direction. The number of the second piezoelectric sheets on the same side can be one, two or more. When the number of the second piezoelectric sheets on the same side is two or more, the second piezoelectric sheets on the same side synchronously and equally expand and contract.
[0019] Preferably, the surface of the first piezoelectric sheet or the second piezoelectric sheet arranged on the barrel-shaped body is a plane, so as to facilitate the arrangement of the piezoelectric sheet. Further optionally, the surface of the first piezoelectric sheet or the second piezoelectric sheet arranged on the barrel-shaped body can be an inner surface of the barrel-shaped body or an outer surface of the barrel-shaped body.
[0020] Further preferably, when the first piezoelectric sheet is arranged on the left and right sides of the barrel-shaped body, the first piezoelectric sheets arranged on the left and right sides of the barrel-shaped body are symmetrically arranged, so as to drive the barrel-shaped body to accurately vibrate in the horizontal direction left and right, without generating a displacement component in the vertical direction; when the second piezoelectric sheet is arranged on the upper and lower sides of the barrel-shaped body, the second piezoelectric sheets arranged on the upper and lower sides of the barrel-shaped body are symmetrically arranged, so as to drive the barrel-shaped body to accurately vibrate in the vertical direction, without generating a displacement component in the horizontal direction.
[0021] The one or more technical solutions in the application have at least the following technical effects or advantages:
[0022] In the application, the inherent frequency of the combined part in two directions is simultaneously satisfied by adjusting the shape structure and / or size parameter of the support plate and the overlapping part, so as to be close enough to ensure good scanning effect and have a uniform and dense scanning grid; meanwhile, there is a sufficient difference, so that the vibration of the combined part in two directions will not be coupled.
[0023] The application makes the piezoelectric actuating part of the Lissajous scanner itself not necessarily have a specific difference in the inherent frequency in two driving directions, and also can avoid the coupling of the vibration in two driving directions, thereby reducing the processing difficulty and the requirement of processing precision; further preferably, the application allows the inherent frequency of the barrel-shaped body in two driving directions to be the same or close, and allows the barrel-shaped body itself to be a rotationally symmetric structure, which further reduces the processing difficulty of the piezoelectric actuating part of the Lissajous scanner, and significantly improves the processing efficiency and yield. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is a structural schematic view of the application. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.
[0026] Embodiment 1:
[0027] As Figure 1As shown, a Lissajous fiber scanner with a support plate comprises a cylindrical body 100, a support plate 103 fixedly connected with the cylindrical body 100, and a fiber 104 fixedly arranged on the support plate 103 in a cantilever support manner,
[0028] With the axis extension direction of the cylindrical body 100 as the front-rear direction, the rear end of the cylindrical body 100 is fixedly connected with the base 200 to be supported by the base 200, at least one side of the left and right sides of the cylindrical body 100 is provided with a first piezoelectric sheet 101, and the front end of the cylindrical body 100 is driven to vibrate left and right along the horizontal direction by the expansion and contraction of the first piezoelectric sheet 101,
[0029] At least one side of the upper and lower sides of the cylindrical body 100 is provided with a second piezoelectric sheet 102, and the front end of the cylindrical body 100 is driven to vibrate along the vertical direction by the expansion and contraction of the second piezoelectric sheet 102;
[0030] The support plate 103 is arranged along the direction parallel to the horizontal plane, and is located at the front side of the cylindrical body 100, and the part of the rear end thereof is attached to the upper surface or the lower surface of the cylindrical body 100 and is fixedly connected with the cylindrical body 100, the surface of the cylindrical body 100 for attaching the support plate is a plane, the fiber 104 is fixedly arranged at the front end of the support plate 103 in a cantilever support manner, the part of the support plate 103 attached to the cylindrical body 100 and the part of the cylindrical body 100 coinciding with the part of the support plate 103 in the front-rear direction constitute a coinciding part, the support plate 103 and the coinciding part make the inherent frequency of the combination part of the cylindrical body 100, the first piezoelectric sheet 101, the second piezoelectric sheet 102, the support plate 103 and the fiber 104 in the horizontal direction greater than the same frequency inherent frequency of the combination part in the vertical direction, and make the combination part 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. In this embodiment, the V-order is the first order, and the U-order is the second order.
[0031] Of course, this is only the parameter selection of this embodiment, in other embodiments of similar structure type to this embodiment, V can also be selected as an integer greater than 1, and U is selected as an integer greater than V.
[0032] Specifically, by adjusting the shape structure and / or size parameters of the support plate 103 and the coinciding part, the inherent frequencies of the combination part used in the two directions are simultaneously satisfied to be close enough to ensure good scanning effect and have uniform and dense scanning grid, and at the same time have sufficient difference to make the vibration of the combination part in the two directions not coupled.
[0033] Preferably, the natural frequency of the cylindrical body 100 in the horizontal direction is the same as its natural frequency of the same order in the vertical direction. Optionally, its outer contour is square, and its interior is provided with a central hole of square or circular shape coaxial with the outer contour. Of course, there is no limitation on this; for example, its outer surface is roughly cylindrical and has several planes arranged rotationally symmetrically, one of which is used to mount the support plate.
[0034] The difference value ensures that when the piezoelectric actuator performs a Lissajous scan under the drive signal, the vibrations of the assembly 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.
[0035] 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.
[0036] 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.
[0037] 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.
[0038] Optionally, either one of the upper and lower sides of the cylindrical body 100 is provided with a second piezoelectric sheet 102, and the front end of the cylindrical body 100 is driven to vibrate up and down in the vertical direction by the expansion and contraction of the second piezoelectric sheet 102. The number of the second piezoelectric sheets 102 can be one, two or more. When the number of the second piezoelectric sheets 102 is two or more, the second piezoelectric sheets 102 are synchronously and equally long in expansion and contraction.
[0039] Optionally, both the upper and lower sides of the cylindrical body 100 are provided with the second piezoelectric sheet 102, and the upper second piezoelectric sheet 102 and the lower second piezoelectric sheet 102 are synchronously and equally long in expansion and contraction in opposite directions, thereby driving the front end of the cylindrical body 100 to vibrate up and down in the vertical direction. The number of the second piezoelectric sheets 102 on the same side can be one, two or more. When the number of the second piezoelectric sheets 102 on the same side is two or more, the second piezoelectric sheets 102 on the same side are synchronously and equally long in expansion and contraction.
[0040] Preferably, the surface of the first piezoelectric sheet 101 or the second piezoelectric sheet 102 provided on the cylindrical body 100 is a plane, so as to facilitate the arrangement of the piezoelectric sheet. Further optionally, the surface of the first piezoelectric sheet 101 or the second piezoelectric sheet 102 provided on the cylindrical body 100 can be the inner surface of the cylindrical body 100 or the outer surface of the cylindrical body 100.
[0041] Further preferably, when the first piezoelectric sheet 101 is provided on both the left and right sides of the cylindrical body 100, the first piezoelectric sheets 101 on the left and right sides of the cylindrical body 100 are symmetrically arranged, so as to drive the cylindrical body 100 to accurately vibrate left and right 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 sheets 102 on the upper and lower sides of the cylindrical body 100 are symmetrically arranged, so as to drive the cylindrical body 100 to accurately vibrate in the vertical direction without generating a displacement component in the horizontal direction.
[0042] The present application allows the piezoelectric actuator of the Lissajous scanner to not necessarily have a specific difference in the inherent frequency in the two driving directions, and also avoids the coupling of the vibrations in the two driving directions, thereby reducing the processing difficulty and the requirement for processing accuracy. Further preferably, the present application allows the inherent frequency of the cylindrical body 100 in the two driving directions to be the same or close, and allows the cylindrical body 100 itself to be a rotationally symmetric structure, which further reduces the processing difficulty of the piezoelectric actuator of the Lissajous scanner, and significantly improves the processing efficiency and the yield.
[0043] It should be noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present application. While the application has been described with reference to preferred embodiments and methods, one skilled in the art will readily appreciate that other embodiments and / or methods might be adapted similarly as combinations of the various novel features and methods described herein, without departing from the scope of the claims. Those skilled in the art will readily recognize numerous adaptations and modifications which can be made within the scope of the present application. For example, those skilled in the art will recognize that the present application can be used in alternative embodiments or methods. Therefore, although the application has been described in some detail to provide a clear understanding thereof, various embodiments and methods are not limited to the descriptions above but only by the claims which follow. Additionally, it is intended that all claims encompassed by the application are to be construed as including alternative language and describe only one of the embodiments of the application. Therefore, the specification and figures are to be regarded as illustrative in nature and not as restrictive.
[0044] All of the features disclosed in this specification (including any accompanying claims, abstract and drawings) can be combined in any combination, except combinations where at least some of such features (whether corresponding to claims, abstract and drawings or not) are mutually exclusive.
[0045] Any feature described in this specification, unless expressly stated to be otherwise, can be replaced by alternative features serving the same, equivalent or similar purpose. That is, unless expressly stated to be otherwise, every feature disclosed in this specification is one example only of a generic series of equivalent or similar features.
[0046] The application is not limited to the specific embodiments described in this specification. The application extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel method or process disclosed in this specification, or any novel combination of the steps of the methods or processes disclosed in this specification.
Claims
1. A Lissajous fiber scanner with a support plate, characterized in that, The optical fiber is fixed on the front end of the support plate in a cantilevered manner. The rear end of the cylindrical body is fixed to the base to be supported by the base. The first piezoelectric sheet is arranged on at least one of the left and right sides of the cylindrical body to drive the front end of the cylindrical body to vibrate left and right along the horizontal direction. The second piezoelectric sheet is arranged on at least one of the upper and lower sides of the cylindrical body to drive the front end of the cylindrical body to vibrate up and down along the vertical direction.
2. A Lissajous fiber scanner with a support plate as claimed in claim 1, characterized in that, The support plate is arranged along the horizontal direction and is located in front of the cylindrical body.
3. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, The rear end of the support plate is attached to the upper surface or the lower surface of the cylindrical body and is fixed to the cylindrical body.
4. A Lissajous fiber scanner with a support plate as claimed in claim 3, characterized in that, The surface of the cylindrical body to which the support plate is attached is a flat surface.
5. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, The front end of the support plate is fixed to the support plate in a cantilevered manner.
6. A Lissajous fiber scanner with a support plate as claimed in claim 5, characterized in that, The part of the support plate attached to the cylindrical body and the part of the cylindrical body coinciding with the part of the support plate in the front-rear direction form a coinciding part.
7. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, The inherent frequency of the combination of the cylindrical body, the first piezoelectric sheet, the second piezoelectric sheet, the support plate, and the optical fiber in the horizontal direction is greater than the same frequency inherent frequency of the combination in the vertical direction.
8. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, The difference between the Uth inherent frequency closest to the Vth inherent frequency in the horizontal direction and the Vth inherent frequency in the vertical direction of the combination is greater than 1. The difference satisfies the Lissajous scanning of the piezoelectric actuator under the driving of the driving signal.
9. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, The difference ranges from 10 Hz to 12 KHz. The difference ranges from 1 KHz to 10 KHz. The inherent frequency of the cylindrical body in the horizontal direction is the same as or similar to the same order inherent frequency in the vertical direction. The outer contour of the cylindrical body is a square, and the center hole in the cylindrical body is a square or a circle. The piezoelectric sheet attached to the outer surface or the inner surface of the cylindrical body is a flat or arc-shaped piezoelectric sheet matching the shape of the outer surface or the inner surface of the cylindrical body. Either of the left and right sides of the cylindrical body is provided with the first piezoelectric sheet to drive the front end of the cylindrical body to vibrate left and right along the horizontal direction. Both the left and right sides of the cylindrical body are provided with the first piezoelectric sheet. Either of the upper and lower sides of the cylindrical body is provided with the second piezoelectric sheet to drive the front end of the cylindrical body to vibrate up and down along the vertical direction. Both the upper and lower sides of the cylindrical body are provided with the second piezoelectric sheet.
10. A Lissajous fiber scanner with a support plate as claimed in claim 1 or 2, characterized in that, When the first piezoelectric sheet is arranged on the left and right sides of the barrel-shaped body, the first piezoelectric sheets arranged on the left and right sides of the barrel-shaped body are symmetrically arranged; when the second piezoelectric sheet is arranged on the upper and lower sides of the barrel-shaped body, the second piezoelectric sheets arranged on the upper and lower sides of the barrel-shaped body are symmetrically arranged.