Magnetic force adjusting and centering structure of optical fiber scanner
By setting a magnetic centering structure in the package sleeve of the optical fiber scanner and adjusting the position of the optical fiber by using magnetic traction, the problem of centering offset of the optical fiber during the packaging process is solved, and high-precision neutralization stability is achieved.
Patent Information
- Application Number
- CN202311640364.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2025-05-30
AI Technical Summary
Existing fiber scanners are difficult to achieve high-precision centering during packaging, resulting in centering offsets, affecting product accuracy and yield.
The magnetic centering structure is adopted, by providing the first magnet and the second magnet in the package sleeve, the position of the optical fiber is adjusted by traction, so that it is coaxial with the imaging mirror group, thereby improving the centering accuracy.
It effectively eliminates the centering offset caused by in-situ curing stress residues, improves the accuracy and stability of the optical fiber scanner, reduces process difficulty and improves yield.
Smart Images
Figure CN120065505A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of fiber optic scanning display, and particularly to a magnetic force adjustment and centering structure for a fiber optic scanner. Background Art
[0002] Fiber optic scanning display (FSD) technology is a display technology that uses a scanning driver to control the swing of an optical fiber while the optical fiber emits light. When the fiber optic scanner is applied to image display, the patterns illuminated by this technology have sharp and saturated colors, high contrast, high brightness, and a very small structural volume.
[0003] For fiber optic scanning display devices, the imaging clarity of the fiber optic end face and the precise centering accuracy are crucial. Theoretically, the fiber optic end face of the fiber optic scanner and the optical axis of the imaging lens group need to be precisely centered. Current technologies achieve satisfactory centering effects by improving processing and assembly accuracy and adjusting the positions of the fiber optic scanner and the lens before encapsulation and fixation.
[0004] However, in order to achieve centering that meets the accuracy requirements in the prior art, complex adjustment tooling, assembly tooling, and high-difficulty assembly and encapsulation processes are required. However, the uncontrollable residual curing stress will still cause centering deviation, which in turn affects the accuracy and yield of the product.
[0005] Therefore, how to reduce the encapsulation difficulty and improve the encapsulation centering accuracy has become a technical problem that urgently needs to be solved in the encapsulation process of fiber optic scanners. Summary of the Invention
[0006] In order to achieve the above-mentioned invention purposes, the present invention provides a magnetic force adjustment and centering structure for a fiber optic scanner, which simplifies the structure to improve the adjustment accuracy and eliminates the centering deviation caused by in-situ curing stress residues.
[0007] The present invention provides a magnetic force adjustment and centering structure for a fiber optic scanner, including an encapsulation sleeve and a fiber optic scanner disposed within the encapsulation sleeve. An imaging lens group is provided at the front end of the encapsulation sleeve.
[0008] The fiber optic scanner includes a scanning driver and an optical fiber. The optical fiber is fixedly arranged at the front end of the scanning driver in a cantilever-supported manner. The scanning driver is fixedly connected to the encapsulation sleeve through a fixing pin.
[0009] The scanning driver is provided with a first magnet, and the encapsulation sleeve is provided with a second magnet that magnetically attracts the first magnet. After adjusting the position of the second magnet so that the front end face of the optical fiber is coaxial with the imaging lens group, the second magnet is fixedly connected to the housing, that is, the second magnet is configured at a position where the front end face of the optical fiber is coaxial with the imaging lens group through the magnetic attraction acting on the first magnet.
[0010] The first magnet described above can be configured at any position of the scanning driver, without any limitation in this regard. When the first magnet is configured on the front side of the fixed needle, compared with when it is configured on the rear side of the fixed needle, it can effectively avoid the amplification effect of the adjustment lever, with higher adjustment accuracy and lower sensitivity of the position to the magnet. Therefore, less magnetic force is required.
[0011] Optionally, an outer adjustment ring is sleeved outside the encapsulation sleeve, and the second magnet is arranged on the outer adjustment ring. By rotating and axially translating the outer adjustment ring, the position of the second magnet relative to the first magnet can be adjusted. When the position of the second magnet makes the front end face of the optical fiber coaxial with the imaging lens group, the outer adjustment ring and the encapsulation housing are fixedly connected to fix the position of the second magnet. The advantage of this solution is that the position adjustment and fixation of the second magnet can be carried out after the scanner is completely encapsulated, without affecting the original process and with strong maintainability.
[0012] Alternatively, an inner adjustment ring is sleeved inside the encapsulation sleeve, and the second magnet is arranged on the inner adjustment ring. By rotating and axially translating the inner adjustment ring, the position of the second magnet relative to the first magnet can be adjusted. When the position of the second magnet makes the front end face of the optical fiber coaxial with the imaging lens group, the inner adjustment ring and the encapsulation housing are fixedly connected to fix the position of the second magnet.
[0013] Generally, under the drive of a drive signal, the scanning driver simultaneously vibrates at a low frequency along a first direction to achieve frame scanning and vibrates at a high frequency along a second direction to achieve line scanning. Taking the high-frequency vibration as the operating frequency, the fixed needle is arranged along a direction parallel to the first direction, and the position where it is connected to the scanning driver is located at the vibration node when the scanning driver vibrates along the second direction at the operating frequency. Since the displacement at the node position is very small during the vibration process, the influence of the fixed needle on the vibration of the scanning driver is reduced. Through experimental comparison, for a fiber optic scanner with the fixed needle connected at the vibration node, when changing the clamping conditions (such as clamping force, clamping part material, base material, etc.), the characteristic frequencies of the required modes for the operation of the fiber optic scanner will not change, and it can accurately display images consistently, and the scanning trajectory will not change. This improves the versatility of the fiber optic scanner, reduces the requirements for installation accuracy and the consistency of installation conditions, and reduces the installation difficulty.
[0014] Further optionally, the scanning driver includes a first actuator, a rigid connecting member, and a second actuator arranged in sequence in the front-to-back direction. The first actuator drives the scanning driver to vibrate at a low frequency in a first direction perpendicular to the front-to-back direction to achieve frame scanning. The second actuator drives the scanning driver to vibrate at a high frequency in a second direction perpendicular to the front-to-back direction to achieve line scanning. And the connection position between the scanning driver and the fixed needle is located at the rigid connecting member. By setting the rigid connecting member, the deformation stress generated by the vibration of the first actuator can only act on the rigid connecting member. Due to the characteristics of the interval and difficult deformation of the rigid connecting member, the fast-axis actuator will not be affected by the reaction force of the bending of the slow-axis actuator, and the response characteristics will not change, ensuring the accuracy of the scanning trajectory. At the same time, the structure of connecting the fixed needle to the rigid connecting member can minimize the influence of the fixed needle on the driving of the first actuator or the second actuator. Similarly, the first magnet can be arranged on the first actuator, the rigid connecting member, or the second actuator, and there is no limitation on this.
[0015] Alternatively, the scanning driver includes an actuator body and a counterweight arranged in sequence in the front-to-back direction. The connection position between the scanning driver and the fixed needle is located at the counterweight. By setting the counterweight, the vibration node closest to the rear end of the scanning driver can be moved backward at the working frequency, so that there is a vibration node of the scanning driver at the counterweight to connect the fixed needle at this position. At the same time, it also effectively reduces the overall length of the scanning actuator, which is beneficial to the miniaturization design of the fiber optic scanner. Similarly, the first magnet can be arranged on the counterweight and the actuator body, and there is no limitation on this.
[0016] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
[0017] The adjustment and fixation of the second magnet in the present invention are carried out after the assembly link (such as welding, bonding, etc.) of the fiber optic scanner. By applying an external force to guide the fixed needle of the scanner to undergo a small deformation to adjust the position of the fiber optic end face, the centering offset caused by the in-situ curing offset can be completely eliminated, thereby improving the accuracy and stability of the overall system, reducing the process difficulty, and increasing the yield rate. The non-contact adjustment method, that is, the centering fine adjustment of the scanner is realized by magnetic force traction of the scanner, avoiding direct contact with the scanner. The intensity and direction of the magnetic force traction can be realized by adjusting the position of the second magnet, further improving the accuracy of the centering fine adjustment. Description of the Drawings
[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;
[0019] Figure 2 It is a schematic structural diagram of the second embodiment of the present invention;
[0020] Figure 3 Structural schematic diagram of the third embodiment of the present invention;
[0021] Figure 4 Structural schematic diagram of the fourth embodiment of the present invention. Specific implementation manners
[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0023] As Figure 1 shown, the embodiment of the present invention provides a magnetic force adjustment and centering structure for an optical fiber scanner, including a packaging sleeve 100 and an optical fiber scanner disposed in the packaging sleeve 100. An imaging lens group 800 is provided at the front end of the packaging sleeve 100.
[0024] The optical fiber scanner includes a scanning driver 200 and an optical fiber 300. The optical fiber 300 is fixedly disposed at the front end of the scanning driver 200 in a cantilever support manner. The scanning driver 200 is fixedly connected to the packaging sleeve 100 through a fixing pin 400.
[0025] The scanning driver 200 is provided with a first magnet 500. The packaging sleeve 100 is provided with a second magnet 600 that magnetically attracts the first magnet 500. After the front end face of the optical fiber 300 is coaxially aligned with the imaging lens group 800 by adjusting the position of the second magnet 600, the second magnet 600 is fixedly connected to the housing, that is, the second magnet 600 is configured at a position where the front end face of the optical fiber 300 is coaxially aligned with the imaging lens group 800 by the magnetic attraction force acting on the first magnet 500 through it.
[0026] The adjustment and fixation of the second magnet 600 of the present invention are after the assembly process of the optical fiber scanner (such as welding, bonding, etc.). By applying an external force to guide the fixing pin 400 of the scanner to undergo a small deformation to adjust the position of the optical fiber end face, the centering deviation caused by in-situ curing offset can be completely eliminated, thereby improving the accuracy and stability of the overall system, reducing the process difficulty, and increasing the yield rate. The non-contact adjustment method is adopted, that is, the centering fine adjustment of the scanner is realized by magnetic force traction of the scanner, avoiding direct contact with the scanner. The intensity and direction of the magnetic force traction can be realized by adjusting the position of the second magnet 600, further improving the accuracy of the centering fine adjustment.
[0027] The first magnet 500 can be configured at any position of the scanning driver 200, and no limitation is imposed thereon. As Figure 1 、Figure 4 In the illustrated embodiment, the first magnet 500 is disposed at the rear side of the fixed needle 400; as Figure 2 、 Figure 3 shown, the first magnet 500 is disposed at the front side of the fixed needle 400. When the first magnet 500 is disposed at the front side of the fixed needle 400, compared with the case where it is disposed at the rear side of the fixed needle 400, the amplification effect of the adjustment lever can be effectively avoided, the adjustment accuracy is higher, and the sensitivity of the position to the magnet is lower. Therefore, less magnetic force is required.
[0028] Optionally, as Figure 3 shown in the illustrated embodiment, an outer adjustment ring 701 is sleeved outside the encapsulation sleeve 100, and the second magnet 600 is disposed on the outer adjustment ring 701. By rotating and axially translating the outer adjustment ring 701, the position of the second magnet 600 relative to the first magnet 500 can be adjusted. When the position of the second magnet 600 makes the front end face of the optical fiber coaxial with the imaging lens group 800, the outer adjustment ring 701 and the encapsulation housing are fixedly connected to fix the position of the second magnet 600. The advantage of this solution is that the position adjustment and fixation of the second magnet 600 can be performed after the scanner is completely encapsulated, which has no influence on the original process and has strong maintainability.
[0029] Alternatively, as Figure 4 shown in the illustrated embodiment, an inner adjustment ring 702 is sleeved inside the encapsulation sleeve 100, and the second magnet 600 is disposed on the inner adjustment ring 702. By rotating and axially translating the inner adjustment ring 702, the position of the second magnet 600 relative to the first magnet 500 can be adjusted. When the position of the second magnet 600 makes the front end face of the optical fiber coaxial with the imaging lens group 800, the inner adjustment ring 702 and the encapsulation housing are fixedly connected to fix the position of the second magnet 600.
[0030] Generally, the scanning driver 200 simultaneously vibrates at a low frequency along a first direction under the drive of a drive signal to achieve frame scanning and vibrates at a high frequency along a second direction to achieve line scanning. Taking the high-frequency vibration as the working frequency, the fixed needle 400 is disposed along a direction parallel to the first direction, and the position where it is connected to the scanning driver 200 is located at the vibration node when the scanning driver 200 vibrates along the second direction at the working frequency. Since the displacement at the node position is very small during the vibration process, the influence of the fixed needle 400 on the vibration of the scanning driver 200 is reduced. Through experimental comparison, for a fiber optic scanner with the fixed needle 400 connected at the vibration node, when the clamping conditions (such as clamping force, clamping member material, base material, etc.) are changed, the characteristic frequencies of the required modes for the operation of the fiber optic scanner will not change, and the image display can be accurately performed consistently, and the scanning trajectory will not change. The versatility of the fiber optic scanner is improved, the requirements for the installation accuracy and the consistency of the installation conditions are reduced, and the installation difficulty is reduced.
[0031] Further optionally, as Figure 1 shown in the embodiment, the scanning driver 200 includes a first actuator 201, a rigid connecting member 202, and a second actuator 203 that are sequentially arranged in the front-to-back direction. The first actuator 201 drives the scanning driver 200 to vibrate at a low frequency in a first direction perpendicular to the front-to-back direction to achieve frame scanning, and the second actuator 203 drives the scanning driver 200 to vibrate at a high frequency in a second direction perpendicular to the front-to-back direction to achieve line scanning. The connection position of the scanning driver 200 and the fixed needle 400 is located at the rigid connecting member 202. By providing the rigid connecting member 202, the deformation stress generated by the vibration of the first actuator 201 can directly act on the rigid connecting member 202. Due to the spacing and non-deformable characteristics of the rigid connecting member 202, the fast-axis actuator is not affected by the reaction force of the slow-axis actuator bending, and the response characteristics do not change, ensuring the accuracy of the scanning trajectory. At the same time, the structure of connecting the fixed needle 400 to the rigid connecting member 202 can minimize the influence of the fixed needle 400 on the driving of the first actuator 201 or the second actuator 203. Similarly, the first magnet 500 can be disposed on the first actuator 201, the rigid connecting member 202, or the second actuator 203, and there is no limitation thereto.
[0032] Alternatively, as Figure 2 shown in the embodiment, the scanning driver 200 includes an actuator body 204 and a counterweight 205 that are sequentially arranged in the front-to-back direction. The connection position of the scanning driver 200 and the fixed needle 400 is located at the counterweight 205. By providing the counterweight 205, the vibration node closest to the rear end of the scanning driver 200 can be shifted backward at the operating frequency, so that the counterweight 205 has the vibration node of the scanning driver 200 at the operating frequency, and the fixed needle 400 is connected thereto. At the same time, the overall length of the scanning actuator is effectively reduced, which is beneficial to the miniaturized design of the fiber optic scanner. Similarly, the first magnet 500 can be disposed on the counterweight 205 and the actuator body 204, and there is no limitation thereto.
[0033] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" or "including" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The use of the words first, second, and third, etc. does not denote any order and these words can be interpreted as names.
[0034] All features disclosed in this specification, except mutually exclusive features, may be combined in any manner.
[0035] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless specifically recited, may be replaced by other equivalent or similar features with a similar purpose. That is, unless specifically recited, each feature is only an example of a series of equivalent or similar features.
[0036] The present invention is not limited to the specific embodiments described above. The present invention extends to any new feature or any new combination disclosed in this specification, as well as to any new method or process step or any new combination disclosed.
Claims
1. A magnetic force adjustment and centering structure for an optical fiber scanner, characterized in that, it includes a packaging sleeve and an optical fiber scanner arranged in the packaging sleeve. An imaging lens group is arranged at the front end of the packaging sleeve, the optical fiber scanner includes a scanning driver and an optical fiber. The optical fiber is fixedly arranged at the front end of the scanning driver in a cantilever support manner. The scanning driver is fixedly connected to the packaging sleeve through a fixing pin, the scanning driver is provided with a first magnet, and the packaging sleeve is provided with a second magnet magnetically attracted to the first magnet. The second magnet is configured at a position where the front end face of the optical fiber is coaxial with the imaging lens group through the magnetic attraction acting on the first magnet.
2. The magnetic force adjustment and centering structure for an optical fiber scanner according to claim 1, characterized in that, an outer adjustment ring is sleeved outside the packaging sleeve, and the second magnet is arranged on the outer adjustment ring. By rotating and axially translating the outer adjustment ring, the position of the second magnet relative to the first magnet is adjusted. When the position of the second magnet makes the front end face of the optical fiber coaxial with the imaging lens group, the outer adjustment ring and the packaging housing are fixedly connected to fix the position of the second magnet.
3. The magnetic force adjustment and centering structure for an optical fiber scanner according to claim 1, characterized in that, an inner adjustment ring is sleeved inside the packaging sleeve, and the second magnet is arranged on the inner adjustment ring. By rotating and axially translating the inner adjustment ring, the position of the second magnet relative to the first magnet is adjusted. When the position of the second magnet makes the front end face of the optical fiber coaxial with the imaging lens group, the inner adjustment ring and the packaging housing are fixedly connected to fix the position of the second magnet.
4. The magnetic force adjustment and centering structure for an optical fiber scanner according to claim 1, characterized in that, under the drive of a drive signal, the scanning driver simultaneously vibrates at a low frequency in a first direction to achieve frame scanning and vibrates at a high frequency in a second direction to achieve line scanning. Taking the high-frequency vibration as the working frequency, the fixing pin is arranged along a direction parallel to the first direction, and the position where it is connected to the scanning driver is located at the vibration node when the scanning driver vibrates in the second direction at the working frequency.
5. The magnetic force adjustment and centering structure for an optical fiber scanner according to claim 4, characterized in that, the scanning driver includes a first actuator, a rigid connecting piece, and a second actuator arranged in sequence along the front-to-back direction. The first actuator drives the scanning driver to vibrate at a low frequency in a first direction perpendicular to the front-to-back direction to achieve frame scanning, and the second actuator drives the scanning driver to vibrate at a high frequency in a second direction perpendicular to the front-to-back direction to achieve line scanning, and the connection position between the scanning driver and the fixing pin is located at the rigid connecting piece.
6. The magnetic force adjustment and centering structure for an optical fiber scanner according to claim 1, characterized in that, the scanning driver includes an actuator body and a counterweight arranged in sequence along the front-to-back direction. The connection position between the scanning driver and the fixing pin is located at the counterweight.