A multi-stage light intensity adjusting device and a light intensity adjusting method

Abstract

This application belongs to the field of optical control technology and discloses a multi-level light intensity adjustment device and method. The device includes: multiple filter strips, which are parallel to each other and spaced apart along the thickness direction; multiple micro-controlled turntables, each filter strip having multiple micro-controlled turntables, the central axis of which is perpendicular to the filter strip, and each micro-controlled turntable can rotate independently around its own central axis, with a fan-shaped light-passing hole for the light beam to pass through; micro-controlled turntables on any two adjacent filter strips are coaxially arranged in a one-to-one correspondence; multiple stepper drive devices are connected to the multiple micro-controlled turntables in a one-to-one correspondence, and the stepper drive devices are used to drive the corresponding micro-controlled turntables to rotate in a step manner; and a focusing device is used to converge the light beams passing through all the micro-controlled turntables of the filter strips into a single beam for output; thereby enabling high-resolution multi-level light intensity adjustment by a single device.

Description

Technical Field

[0001] This application relates to the field of optical control technology, and more specifically, to a multi-level light intensity adjustment device and method. Background Technology

[0002] In the field of optical control technology, light intensity adjustment devices are often used to obtain extremely fine light beams. Traditional light intensity adjustment devices use multiple layers of concave and convex lenses to adjust the light intensity of extremely fine light beams. The structure is complex and the number of light intensity levels that can be adjusted is small. Furthermore, the intensity difference between different light intensity levels is large (i.e., the resolution between light intensity levels is low). To achieve the adjustment of various specified light intensities, it is necessary to change the relevant lens equipment, which is cumbersome to operate. Summary of the Invention

[0003] The purpose of this application is to provide a multi-level light intensity adjustment device and method, which can achieve high-resolution multi-level light intensity adjustment by a single device.

[0004] In a first aspect, this application provides a multi-level light intensity modulation device, comprising:

[0005] A multi-layered filter band, wherein the filter band is opaque, and the multiple filter bands are arranged parallel to each other and spaced apart along the thickness direction;

[0006] Multiple micro-controlled turntables are provided on each layer of the filter strip. The central axis of each micro-controlled turntable is perpendicular to the filter strip. Each micro-controlled turntable can rotate independently around its own central axis. Each micro-controlled turntable has a fan-shaped light-passing hole for light beams to pass through. The central axis of the fan-shaped light-passing hole coincides with the central axis of the corresponding micro-controlled turntable. The micro-controlled turntables on any two adjacent layers of the filter strip are coaxially arranged in a one-to-one correspondence.

[0007] Multiple stepper drive devices are connected to multiple micro-controlled turntables in a one-to-one driving manner. The stepper drive devices are used to drive the corresponding micro-controlled turntables to rotate in a step manner.

[0008] A focusing device is used to converge the light beams passing through all the filter bands of the micro-controlled turntable into a single beam for output.

[0009] By adjusting the rotation angle of each micro-control turntable located on the same central axis, the light transmission area of ​​the beam in the direction of the central axis can be adjusted step by step, thereby realizing multi-level adjustment of the light intensity of the beam in the direction of the central axis. Since multiple adjusted beams are converged and each beam is independently adjusted in multiple levels, the converged beam can achieve more levels of light intensity adjustment, thus enabling high-resolution multi-level light intensity adjustment by a single device.

[0010] Preferably, the number of filter layers, the circumferential angle of the fan-shaped light-transmitting aperture, and the step angle of the micro-controlled turntable satisfy the following conditions:

[0011] a / 2π = (M-1) / M;

[0012] N*1 / M≥1;

[0013] △a / 2π=1 / K and K≥M;

[0014] Where a is the circumferential angle of the fan-shaped light-transmitting aperture, M is a positive integer greater than 1, N is the number of filter layers, Δa is the step angle of the micro-controlled turntable, and K is a positive integer.

[0015] Preferably, N is 2, M is 2, and K is 8.

[0016] Preferably, the stepper drive device is an ultrasonic motor.

[0017] Ultrasonic motors have the advantage of extremely high positioning accuracy, which can accurately realize the stepping rotation of the micro-controlled turntable, thereby improving the precision of light intensity adjustment.

[0018] Optionally, the stepper drive device is connected to a drive disk and drives the drive disk to rotate, wherein the outer periphery of the drive disk abuts or meshes with the outer periphery of the micro-controlled turntable.

[0019] Optionally, the stepper drive device includes two elastic bodies, each elastic body including an arc arm and a drive arm integrally disposed at one end of the arc arm. The upper and lower surfaces of the drive arm are provided with piezoelectric ceramic plates. The two arc arms are sleeved on the outer side of the micro-controlled turntable, and each arc arm has an inwardly protruding drive foot on its inner side. The drive foot abuts against the circumferential surface of the micro-controlled turntable. The piezoelectric ceramic plate is used to drive the corresponding arc arm to vibrate when energized, so that the drive foot moves along an inclined straight line, thereby driving the micro-controlled turntable to rotate. The inclined straight line has an angle with the tangent of the micro-controlled turntable, and the driving directions of the two drive feet are opposite.

[0020] Preferably, the focusing device includes a mirror group and an optical waveguide. The mirror group includes at least one mirror, which is used to reflect the light beam passing through all the filter bands of the micro-controlled turntable to a first end of the optical waveguide. The light beams entering the optical waveguide are converged into a single beam and then output from a second end of the optical waveguide.

[0021] The convergence of multiple adjusted light beams is achieved through a reflector and an optical waveguide, resulting in a simple structure and low equipment cost.

[0022] Optionally, the number of the reflectors is equal to the number of the micro-controlled disks in one layer of the filter strip, and the central axis of each micro-controlled disk in the same layer of the filter strip intersects with one of the reflectors.

[0023] Optionally, the number of reflectors is equal to the number of micro-controlled disks in one layer of the filter strip minus 1. In the same layer of the filter strip, the central axis of one of the micro-controlled disks intersects with the first end of the optical waveguide, and the central axes of the other micro-controlled disks each intersect with one of the reflectors.

[0024] Secondly, this application provides a light intensity modulation method based on the multi-level light intensity modulation device described above, comprising the following steps:

[0025] The ratio of the target light intensity to the original light intensity of the original beam is denoted as the target light intensity ratio.

[0026] The target light intensity level is determined based on the target light intensity ratio;

[0027] The rotation angle of each micro-controlled turntable is calculated based on the target light intensity level;

[0028] The rotation angle of each micro-controlled turntable is controlled according to the rotation angle of each micro-controlled turntable.

[0029] Beneficial effects: The multi-level intensity adjustment device and method provided in this application can adjust the light transmission area of ​​the light beam in the direction of the central axis by adjusting the rotation angle of each micro-controlled turntable located on the same central axis, thereby realizing multi-level adjustment of the light intensity of the light beam in the direction of the central axis. Since multiple adjusted light beams are converged and each light beam is independently subjected to multi-level intensity adjustment, the converged light beam can achieve a wider range of intensity adjustment levels, thereby enabling high-resolution multi-level intensity adjustment by a single device. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the first multi-level light intensity modulation device provided in the embodiments of this application.

[0031] Figure 2 This is a schematic diagram illustrating the connection structure between a micro-controlled turntable and a stepper drive device.

[0032] Figure 3 This is a schematic diagram illustrating another connection structure between a micro-controlled turntable and a stepper drive device.

[0033] Figure 4 This is a schematic diagram of the structure of a second type of multi-level light intensity modulation device provided in the embodiments of this application.

[0034] Figure 5This is a schematic diagram of the structure of the third type of multi-level light intensity modulation device provided in the embodiments of this application.

[0035] Figure 6 A flowchart of the light intensity tuning method provided in the embodiments of this application.

[0036] Labeling Explanation: 1. Filter band; 2. Micro-controlled turntable; 201. Fan-shaped light-passing hole; 3. Stepper drive device; 301. Elastomer; 302. Arc arm; 303. Drive arm; 304. Piezoelectric ceramic sheet; 305. Drive foot; 306. Elastic connector; 4. Focusing device; 401. Reflector; 402. Optical waveguide; 403. Focusing reflector; 405. Convex lens; 5. Drive disk. Detailed Implementation

[0037] 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 a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Please refer to Figures 1-5 A multi-level light intensity modulation device in some embodiments of this application includes:

[0040] Multi-layer filter band 1, filter band 1 is opaque, and the multi-layer filter band 1 is parallel to each other and spaced apart along the thickness direction;

[0041] Multiple micro-controlled turntables 2 are provided on each layer of filter strip 1. The central axis of the micro-controlled turntable 2 is perpendicular to the filter strip 1. Each micro-controlled turntable 2 can rotate independently around its own central axis. The micro-controlled turntable 2 has a fan-shaped light transmission hole 201 for the light beam to pass through. The central axis of the fan-shaped light transmission hole 201 coincides with the central axis of the corresponding micro-controlled turntable 2. The micro-controlled turntables 2 on any two adjacent layers of filter strip 1 are coaxially arranged in a one-to-one correspondence.

[0042] Multiple stepper drive devices 3 are connected to multiple micro-controlled turntables 2 in a one-to-one driving manner. The stepper drive devices 3 are used to drive the corresponding micro-controlled turntables 2 to rotate in a step manner.

[0043] Concentrating device 4 is used to converge the light beams passing through all the filter bands 1 and the micro-controlled turntable 2 into a single beam for output.

[0044] By adjusting the rotation angle of each micro-controlled turntable 2 located on the same central axis, the light transmission area of ​​the beam in the direction of the central axis can be adjusted step by step, thereby realizing multi-level adjustment of the light intensity of the beam in the direction of the central axis. Since multiple adjusted beams are converged and each beam is independently adjusted in multiple levels, the converged beam can achieve more levels of light intensity adjustment, thus enabling high-resolution multi-level light intensity adjustment by a single device.

[0045] During operation, the rotation angle of each micro-controlled turntable 2 on the same central axis is determined according to the required light intensity. This ensures that the proportion of the total light-transmitting area T of each micro-controlled turntable 2 on the same central axis within the area S of the entire circle (referring to the area of ​​a circle with the same radius as the fan-shaped light-transmitting aperture 201) equals the proportion of the required light intensity within the original light intensity P0 of the original beam. This allows for the adjustment of the light intensity of each original beam. (For example, assuming there are two filter layers 1, the circumferential angle of the fan-shaped light-transmitting aperture 201 is π, and the step angle of the micro-controlled turntable 2 is 2π*1 / 8, if it is necessary to adjust the light intensity of an original beam to 1 / 8 of its original intensity, the first micro-controlled turntable 2 on the corresponding central axis can be kept within the range of π / 2.) With the angle unchanged, the second micro-controlled turntable 2 on the central axis is rotated 3 steps, so that 3 / 4 of the projection of the fan-shaped light-transmitting hole 201 of the first micro-controlled turntable 2 onto the second micro-controlled turntable 2 is blocked. Thus, the total light-transmitting area T on the central axis is S*1 / 8, which is equivalent to the overall light transmittance of the beam channel corresponding to the central axis being 1 / 8. After the original beam passes through the first micro-controlled turntable 2, the light intensity changes from P0 to P0*1 / 2. After passing through the second micro-controlled turntable 2, the light intensity changes to P0*1 / 8. According to actual needs, the light intensity of multiple original beams is adjusted and then converged to obtain other light intensity levels outside the range that a single beam can adjust.

[0046] In this context, the filter band 1 does not refer to a strip in the narrow sense. Any light-blocking plate-like structure, sheet-like structure, or strip-like structure can be used as the filter band 1.

[0047] In the initial state, the fan-shaped light-transmitting holes 201 of the micro-control turntable 2 on the same central axis are preferably all facing each other (that is, the projection of the fan-shaped light-transmitting hole 201 of any micro-control turntable 2 onto the adjacent micro-control turntable 2 is not blocked), so as to facilitate the calculation and adjustment of the rotation angle of each micro-control turntable 2.

[0048] Preferably, the number of layers of the filter strip 1, the circumferential angle of the fan-shaped light-transmitting aperture 201, and the step angle of the micro-controlled turntable 2 satisfy the following conditions:

[0049] a / 2π=(M-1) / M (1;

[0050] N*1 / M≥1 (2)

[0051] △a / 2π=1 / K and K≥M (3;

[0052] Where a is the circumferential angle of the fan-shaped light-transmitting aperture 201, M is a positive integer greater than 1, N is the number of layers of the filter strip 1, Δa is the step angle of the micro-control turntable 2, and K is a positive integer.

[0053] Therefore, the size of M determines the range of light intensity adjustment on the same central axis. The larger M is, the larger the range of light intensity adjustment on the same central axis, but the more filter bands 1 N are required. Among them, by using condition (2), the micro-control turntable 2 on the same central axis can completely block the light beam, thereby adjusting the light intensity of the light beam to 0, thereby adjusting the number of light beams that finally pass through all filter bands 1. The size of K determines the resolution of light intensity adjustment (inter-level spacing of light intensity). The larger K is, the higher the resolution.

[0054] Specifically, N, M, and K can be set according to actual needs. For example, in some embodiments, N is 2 and M is 2 (thus the fan-shaped light-transmitting aperture 201 is semi-circular, such as...). Figure 2 , Figure 3 As shown), K is 8; this avoids the structure becoming too complex due to too many layers of filter band 1. The light intensity of the beam on the same central axis can be adjusted to 0, 1 / 8, 2 / 8, 3 / 8 or 4 / 8 of the original light intensity. After multiple beams are gathered, the light intensity levels of the final beam can include 1 / 8, 2 / 8, 3 / 8... 8 / 8 of the original light intensity, thus having a sufficient number of light intensity levels.

[0055] The number of micro-controlled turntables 2 on each filter layer 1 can be set according to actual needs, for example... Figure 1 In this process, the number of micro-controlled turntables 2 on each layer of filter strip 1 is 5, but not limited to this.

[0056] Preferably, the stepper drive device 3 is an ultrasonic motor. Ultrasonic motors have the advantage of extremely high positioning accuracy, which can accurately realize the stepping rotation of the micro-controlled turntable 2, thereby improving the accuracy of light intensity adjustment.

[0057] The ultrasonic motor can be selected from existing ultrasonic motor technologies.

[0058] In some implementations, see Figure 2The stepper drive device 3 is connected to a drive disk 5 and drives the drive disk 5 to rotate. The outer circumference of the drive disk 5 abuts or meshes with the outer circumference of the micro-controlled turntable 2. For example, the outer circumferences of both the micro-controlled turntable 2 and the drive disk 5 are smooth circles, and the outer circumferences of the micro-controlled turntable 2 and the drive disk 5 abut each other, thereby transmitting power through friction; or, the outer circumferences of both the micro-controlled turntable 2 and the drive disk 5 are provided with gear teeth, and the gear teeth of the two mesh with each other, thereby transmitting power through gear teeth.

[0059] In other embodiments, see Figure 3 (The figure shows a top view.) The stepper drive device 3 includes two elastic bodies 301. Each elastic body 301 includes an arc arm 302 and a drive arm 303 integrally disposed at one end of the arc arm 302. Piezoelectric ceramic plates 304 are disposed on the upper and lower surfaces of the drive arm 303. The two arc arms 302 are sleeved on the outer side of the micro-controlled turntable 2, and each arc arm 302 has an inwardly protruding drive foot 305 on its inner side. The drive foot 305 abuts against the circumferential surface of the micro-controlled turntable 2. The piezoelectric ceramic plate 304 is used to drive the corresponding arc arm 302 to vibrate when energized, causing the drive foot 305 to move along an inclined straight line, thereby driving the micro-controlled turntable 2 to rotate. The inclined straight line forms an angle with the tangent of the micro-controlled turntable 2, and the driving directions of the two drive feet 305 are opposite. Specifically, when the first drive foot 305 moves in the direction closer to the micro-controlled turntable 2 (e.g., ...), ... Figure 3 In the middle, the upper drive foot 305 moves to the left), and through friction, the micro-controlled turntable 2 is driven to rotate in the first direction (e.g., Figure 3 In the middle, the first direction is counterclockwise; when the second drive foot 305 moves along the direction closer to the micro-control turntable 2 (e.g. Figure 3 In the middle, the lower drive foot 305 moves to the left), and through friction, the micro-controlled turntable 2 is driven to rotate in the second direction (e.g., Figure 3 In the middle, the second direction is clockwise.

[0060] When the micro-controlled turntable 2 needs to rotate along the first direction, a periodic voltage signal is input to the piezoelectric ceramic sheet 304 of the first elastic body 301 (i.e., the elastic body 301 where the first driving foot 305 is located), stimulating the working mode of the first elastic body 301, thereby causing the first driving foot 305 to rotate along an inclined straight line (such as...). Figure 3In the linear vibration (a) of the micro-controller 305, when the first driving foot 305 moves in the direction close to the micro-controller 2, it presses against the micro-controller 2 and drives the micro-controller 2 to rotate. When the first driving foot 305 moves in the opposite direction, it disengages from the micro-controller 2, thus preventing the micro-controller 2 from rotating in the opposite direction, achieving unidirectional rotation of the micro-controller 2 in the first direction. When the micro-controller 2 needs to rotate in the second direction, a periodic voltage signal is input to the piezoelectric ceramic sheet 304 of the second elastic body 301 (i.e., the elastic body 301 where the second driving foot 305 is located), exciting the working mode of the second elastic body 301, thereby causing the second driving foot 305 to rotate along an inclined linear path (e.g., ...). Figure 3 In the linear vibration (b), when the second driving foot 305 moves in the direction close to the micro-controlled turntable 2, it presses against the micro-controlled turntable 2 and drives it to rotate. When the second driving foot 305 moves in the opposite direction, it disengages from the micro-controlled turntable 2, thus preventing it from rotating in the opposite direction, achieving unidirectional rotation of the micro-controlled turntable 2 in the second direction. The rotation angle can be precisely controlled by adjusting the periodic wave number of the input piezoelectric ceramic sheet 304.

[0061] Furthermore, the two ends of the two elastic bodies 301 can be connected by an elastic connector 306 (such as a tension spring) to ensure that the two drive feet 305 are reliably pressed against the circumference of the micro-control turntable 2.

[0062] The micro-controlled turntable 2 can be linearly distributed, circularly distributed, arrayed, or otherwise distributed on the filter band 1. For example... Figure 1 In the middle, it is a linear distribution.

[0063] In some implementations, see Figure 1 The focusing device 4 includes a mirror assembly and an optical waveguide 402. The mirror assembly includes at least one mirror 401, which reflects the light beams passing through all the micro-controlled rotating disks 2 of the filter bands 1 (i.e., the light beams on each central axis that are not completely blocked) to the first end of the optical waveguide 402. The light beams entering the optical waveguide 402 are converged into a single beam and then output from the second end of the optical waveguide 402. The focusing of multiple adjusted light beams is achieved through the mirrors 401 and the optical waveguide 402, resulting in a simple structure and low equipment cost.

[0064] The reflector 401 can be a mirror that uses a reflective coating for reflection, or a mirror that uses the principle of total internal reflection. Preferably, it is a mirror that uses the principle of total internal reflection to reduce the loss of the light beam at the reflector 401 and ensure the accuracy of the adjustment of the light intensity of the converged light beam.

[0065] Among them, optical waveguide 402 can be a straight optical waveguide or a curved optical waveguide.

[0066] In some embodiments, the number of reflectors 401 is equal to the number of micro-controlled disks 2 in a single layer of filter 1, and the central axis of each micro-controlled disk 2 in the same layer of filter 1 intersects with one reflector 401. For example, if there are 5 micro-controlled disks 2 and 5 reflectors 401 in a single layer of filter 1, and the central axis of each micro-controlled disk 2 intersects with one reflector 401, then the light beam on each central axis will be reflected by the corresponding reflector 401 to the first end of the optical waveguide 402. The tilt angle of each reflector 401 is set according to the actual position of the reflector 401 and the actual position of the optical waveguide 402.

[0067] In other embodiments, such as Figure 1 As shown, the number of reflectors 401 is equal to the number of micro-control disks 2 in one layer of filter 1 minus one. In the same layer of filter 1, the central axis of one micro-control disk 2 intersects the first end of the optical waveguide 402, and the central axes of the other micro-control disks 2 each intersect with one reflector 401. For example, if the number of micro-control disks 2 in one layer of filter 1 is 5 and the number of reflectors 401 is 4, then one beam of light can be directly incident on the first end of the optical waveguide 402 without the need for a reflector 401 to change its direction. Other beams of light need to be redirected by reflectors 401 to be incident on the first end of the optical waveguide 402, thus reducing the number of reflectors 401 by one.

[0068] In practice, a focusing reflector 403 can be used instead of the reflector assembly. The central axis of the focusing reflector 403 is parallel to the central axis of the micro-control turntable 2, and the first end of the optical waveguide 402 is positioned at the focal point of the focusing reflector 403, such as... Figure 4 As shown. The optical waveguide 402 can be configured as a curved optical waveguide to change the light output direction of the optical waveguide 402, depending on actual needs.

[0069] Alternatively, a convex lens 405 can be used to replace the reflector assembly, with the optical axis of the convex lens 405 parallel to the central axis of the micro-controlled turntable 2, and the first end of the optical waveguide 402 positioned at the focal point of the convex lens 405 on the side furthest from the filter band 1, such as... Figure 5 As shown. Since each beam is parallel to the optical axis of the convex lens 405, it will be focused at the focal point and thus all enter the first end of the optical waveguide 402.

[0070] It should be noted that, since the optical path lengths of each beam are different when they reach the first end of the optical waveguide 402, the phases of each beam at the first end of the optical waveguide 402 are somewhat different. This difference can be reduced by reasonably setting the positions of each micro-controlled turntable 2, thereby reducing the deviation between the combined light intensity and the sum of the light intensities of each beam before combining. In addition, experiments have shown that for laser beams, which have strong light intensity, the light intensity deviation rate caused by this phase difference is very small and can be ignored.

[0071] refer to Figure 6 This application provides a light intensity modulation method based on the multi-level light intensity modulation device described above, including the following steps:

[0072] A1. The ratio of the target light intensity (i.e. the light intensity required to be output by the focusing device 4) to the original light intensity of the original beam is denoted as the target light intensity ratio.

[0073] A2. Determine the target light intensity level based on the target light intensity ratio;

[0074] A3. Calculate the rotation angle of each micro-control turntable 2 based on the target light intensity level;

[0075] A4. Control each micro-control turntable 2 to rotate at the corresponding angle according to the rotation angle of each micro-control turntable 2.

[0076] The number of light intensity levels that the multi-level light intensity adjustment device can output can be pre-calculated and recorded to form a first lookup table. This light intensity level represents the ratio of the light intensity output by the focusing device 4 to the original light intensity of a single beam (which is also equivalent to the overall transmittance of the corresponding beam channel), for example, when N is 2, M is 2, and K is 8. The adjustable light intensity levels for a single beam include 0, 1 / 8, 2 / 8, 3 / 8, and 4 / 8. If each filter layer 1 has 5 micro-controlled rotating disks 2, the final number of light intensity levels that the entire multi-level light intensity adjustment device can output includes 0, 1 / 8, 2 / 8, 3 / 8, 4 / 8, 5 / 8...20 / 8. The rotation angle of each micro-controlled rotating disk 2 on the same central axis corresponding to each adjustable light intensity level of a single beam can be pre-calculated and recorded to form a second lookup table.

[0077] In step A2, if the target light intensity ratio does not exceed the maximum light intensity level that the multi-level light intensity adjustment device can output, then the light intensity level that the multi-level light intensity adjustment device can output that is closest to the target light intensity ratio (which can be obtained from the first lookup table) is taken as the target light intensity level; if the target light intensity ratio exceeds the maximum light intensity level that the multi-level light intensity adjustment device can output, then the light intensity adjustment process is terminated, and an error signal may be further issued.

[0078] In step A3, if the target light intensity level belongs to one of the adjustable light intensity levels of a single beam, then select (but not limited to random selection) one of the micro-control turntables 2 on the central axis as the first working micro-control turntable (i.e., select one of the micro-control turntables 2 on the beam channel as the first working micro-control turntable), and look up the rotation angle of each micro-control turntable 2 on the same central axis corresponding to the target light intensity level in the second lookup table, and use it as the rotation angle of each first working micro-control turntable; for example, if N is 2, M is 2, and K is 8, and the target light intensity level is 3 / 8, then it belongs to one of the adjustable light intensity levels of a single beam.

[0079] If the target light intensity level is not one of the adjustable light intensity levels of a single beam, calculate the integer part *m* and the remainder *n* of the quotient between the target light intensity level and the maximum adjustable light intensity level of the single beam. Select (but not limited to random selection) *m* micro-control turntables 2 on the central axis as the second working micro-control turntables, resulting in *m* groups of second working micro-control turntables (micro-control turntables 2 on the same central axis constitute one group of second working micro-control turntables). Additionally, select (but not limited to random selection) one more micro-control turntable 2 on the central axis as the third working micro-control turntable. Look up the rotation angle of each micro-control turntable 2 on the same central axis corresponding to the maximum adjustable light intensity level of the single beam in the second lookup table. Use this as the rotation angle of each second working micro-control turntable in each group of second working micro-control turntables. Also, look up the corresponding rotation angle in the second lookup table. The rotation angles of each micro-control disk 2 on the same central axis corresponding to the adjustable intensity level of the single beam of light with remainder n are used as the rotation angles of each third working micro-control disk. For example, if N is 2, M is 2, and K is 8, and the target intensity level is 7 / 8, then it does not belong to one of the adjustable intensity levels of the single beam of light. The maximum adjustable intensity level of the single beam of light is 4 / 8. At this time, m=1 and n=3 / 8. The rotation angles of each micro-control disk 2 on the same central axis corresponding to the maximum adjustable intensity level of the single beam of light 4 / 8 can be found in the second lookup table and used as the rotation angles of each second working micro-control disk. The rotation angles of each micro-control disk 2 on the same central axis corresponding to the intensity level of 3 / 8 can also be found in the second lookup table and used as the rotation angles of each third working micro-control disk.

[0080] Furthermore, in step A3, the original beam corresponding to the non-working micro-control turntable can be turned off; or the rotation angle of each micro-control turntable 2 on the same central axis corresponding to the light intensity level 0 can be looked up in the second lookup table, and used as the rotation angle of the non-working micro-control turntable in each non-working micro-control turntable group (non-working micro-control turntables on the same central axis constitute a non-working micro-control turntable group, and the non-working micro-control turntable is the micro-control turntable 2 that is not selected as one of the first working micro-control turntable, the second working micro-control turntable, and the third working micro-control turntable). Thus, no beam can be emitted from the unselected beam channel.

[0081] In step A4, the rotation angle of each micro-controlled turntable 2 is divided by the step angle to obtain the rotation number of each micro-controlled turntable 2, and then each micro-controlled turntable 2 is controlled to rotate the corresponding number of rotation steps.

[0082] In summary, the multi-stage intensity modulation device and method provided in this application have the following advantages:

[0083] 1. By adjusting the rotation angle of the multi-level micro-control turntable 2, multi-level blocking of the light beam can be achieved, thereby enabling the selection of a light beam of specific intensity and improving the accuracy of the light adjustment process;

[0084] 2. Compared with traditional beam adjustment devices that can only reduce or increase beam intensity, this application can not only enhance beam intensity by reasonably setting the number of micro-controlled turntables 2 on each filter band 1, but also reduce beam intensity, thereby obtaining a beam with a wider intensity range and a wider range of applications.

[0085] 3. In a multi-level light intensity adjustment device, multi-level, high-resolution light intensity adjustment can be achieved.

[0086] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0087] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A multi-level light intensity modulation device, characterized in that, include: Multilayer filter band (1), the filter band (1) is opaque, and the multiple filter bands (1) are parallel to each other and spaced apart along the thickness direction; Multiple micro-controlled turntables (2) are provided on each layer of the filter strip (1). The central axis of the micro-controlled turntable (2) is perpendicular to the filter strip (1). Each micro-controlled turntable (2) can rotate independently around its own central axis. The micro-controlled turntable (2) is provided with a fan-shaped light-transmitting hole (201) for the light beam to pass through. The central axis of the fan-shaped light-transmitting hole (201) coincides with the central axis of the corresponding micro-controlled turntable (2). The micro-controlled turntables (2) on any two adjacent layers of the filter strip (1) are coaxially arranged in a one-to-one correspondence. Multiple stepper drive devices (3) are connected to multiple micro-controlled turntables (2) in a one-to-one driving manner. The stepper drive devices (3) are used to drive the corresponding micro-controlled turntables (2) to rotate in a step manner. A focusing device (4) is used to converge the light beams passing through all the filter bands (1) of the micro-controlled turntable (2) into a single beam for output. The number of layers of the filter strip (1), the circumferential angle of the fan-shaped light-transmitting hole (201), and the step angle of the micro-controlled turntable (2) satisfy the following conditions: a / 2π = (M-1) / M; N*1 / M≥1; △a / 2π=1 / K and K≥M; Where a is the circumferential angle of the fan-shaped light-transmitting hole (201), M is a positive integer greater than 1, N is the number of layers of the filter strip (1), △a is the step angle of the micro-controlled turntable (2), and K is a positive integer; The stepper drive device (3) includes two elastic bodies (301). Each elastic body (301) includes an arc arm (302) and a drive arm (303) integrally disposed at one end of the arc arm (302). The upper and lower surfaces of the drive arm (303) are provided with piezoelectric ceramic plates (304). The two arc arms (302) are sleeved on the outside of the micro-controlled turntable (2), and each arc arm (302) has an inwardly protruding drive foot (305) on its inner side. The drive foot (305) abuts against the circumferential surface of the micro-controlled turntable (2). The piezoelectric ceramic plate (304) is used to drive the corresponding arc arm (302) to vibrate when energized, so that the drive foot (305) moves along an inclined straight line, thereby driving the micro-controlled turntable (2) to rotate by the drive foot (305). The inclined straight line has an angle with the tangent of the micro-controlled turntable (2), and the driving directions of the two drive feet (305) are opposite.

2. The multi-level light intensity modulation device according to claim 1, characterized in that, N is 2, M is 2, and K is 8.

3. The multi-level light intensity modulation device according to claim 1, characterized in that, The stepper drive device (3) is an ultrasonic motor.

4. The multi-level light intensity modulation device according to claim 3, characterized in that, The stepper drive device (3) is connected to a drive disk (5) and drives the drive disk (5) to rotate. The outer periphery of the drive disk (5) abuts or meshes with the outer periphery of the micro-controlled turntable (2).

5. The multi-level light intensity modulation device according to claim 1, characterized in that, The focusing device (4) includes a mirror group and an optical waveguide (402). The mirror group includes at least one mirror (401). The mirror (401) is used to reflect the light beam passing through all the filter bands (1) of the micro-controlled turntable (2) to the first end of the optical waveguide (402). The light beam entering the optical waveguide (402) is converged into a beam and then output from the second end of the optical waveguide (402).

6. The multi-level light intensity modulation device according to claim 5, characterized in that, The number of the reflectors (401) is equal to the number of the micro-control disks (2) in the filter strip (1) of the same layer. The central axis of each micro-control disk (2) in the same filter strip (1) intersects with one of the reflectors (401).

7. The multi-level light intensity modulation device according to claim 5, characterized in that, The number of the reflectors (401) is equal to the number of the micro-control disks (2) in one layer of the filter strip (1) minus 1. In the same layer of the filter strip (1), the central axis of one of the micro-control disks (2) intersects with the first end of the optical waveguide (402), and the central axes of the other micro-control disks (2) intersect with one of the reflectors (401).

8. A light intensity modulation method, characterized in that, The multi-level light intensity modulation device according to any one of claims 1-7 includes the following steps: The ratio of the target light intensity to the original light intensity of the original beam is denoted as the target light intensity ratio. The target light intensity level is determined based on the target light intensity ratio; The rotation angle of each of the micro-controlled turntables (2) is calculated based on the target light intensity level; The micro-control turntable (2) is controlled to rotate by a corresponding angle according to the rotation angle of each micro-control turntable (2).

Images