Optical meter axis movement detection device for constructing convex lens based on microfluidics
By setting up a microfluidic array and droplets between the optical meter axis and the image sensor, an optical meter axis movement detection device with a convex lens shape is constructed, which solves the problem of low detection accuracy in the prior art and achieves higher detection accuracy.
Patent Information
- Application Number
- CN202420053053.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-09
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-09
AI Technical Summary
The existing optical meter axis movement detection technology has the problem of low detection accuracy, mainly because the pixel density of the image sensor cannot meet the high-precision requirements, resulting in limited detection points and the movement direction and distance of the optical meter axis cannot be accurately judged.
Using an optical meter axis movement detection device that constructs a convex lens based on microfluidic control, by setting a microfluidic array and droplets between the optical meter axis and the image sensor, the convex lens shape of the droplets gathers the spot group after the laser irradiation, so that the light spot group after the laser is irradiated is gathered. The fixed-area image sensor can collect a larger range of spot groups, thereby improving detection accuracy.
By adding microfluidic arrays and droplets, the graphical area of the spot group is reduced, and the image sensor can collect more feature points, which significantly improves the detection accuracy of optical table axis movement detection.
Smart Images
Figure CN222167633U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of microfluidics, and in particular to an optical table axis movement detection device based on a convex lens constructed by microfluidics. Background Art
[0002] The detection principles of optical watch axes in electronic watches on the market are similar. The main principles are: laser irradiates the optical watch axis, diffraction occurs to produce many light spots, and an image sensor (such as CMOS, CCD, etc.) with a fixed area and position collects the light spots to obtain a first grayscale image. After the optical watch axis rotates, the light spot group will move, and the image sensor will obtain a second grayscale image after collection. The two grayscale images are processed, and the direction and distance of the optical watch axis movement are inferred based on the same patterns in the first grayscale image and the second grayscale image, and then fed back to the display interface that the user can see.
[0003] like Figure 1 The figure shows the principle diagram of the movement detection of the optical axis. In fact, the image sensor is stationary, and the light spot group is moving. For easier understanding, the coordinate system is switched, and it is shown that the light spot group is stationary, and the image sensor is moving. Figure 1 In the figure, the laser irradiates the optical axis, and a light spot group is generated within the imaging range. The solid rectangular frame is the first grayscale image before the optical axis moves, and the dotted rectangular frame is the second grayscale image after the optical axis moves. The overlapping area of the first grayscale image and the second grayscale image is the same pattern area before and after the optical axis moves. The moving direction of the optical axis can be detected based on the first grayscale image and the second grayscale image.
[0004] It can be seen that whether the same pattern can be accurately judged, and not misjudged as the same pattern due to the proximity of the patterns, is crucial to accurately detect movement. Image sensors are relatively expensive, and the density cannot be very large, which determines that the number of detectable points in the prior art is limited. Usually, the pixel size of an image sensor is at the level of tens of microns, and the number of pixels is in the tens times tens. If all these points are hit in similar areas, the detection accuracy is low. If more feature positions (i.e. positions with large changes such as image edges) can be hit, the detection accuracy is high.
[0005] In summary, the current optical table axis movement detection has the problem of low detection accuracy. Utility Model Content
[0006] The present application provides an optical watch axis movement detection device based on a microfluidic convex lens to solve the problem of low detection accuracy of current optical watch axis movement detection.
[0007] The embodiment of the present application provides an optical table axis movement detection device based on microfluidic construction of a convex lens, including a microfluidic array, a droplet, and an image sensor;
[0008] The microfluidic array includes various microfluidic units; the microfluidic unit includes a first microfluidic chip; the droplet is located on the surface of the first microfluidic chip, and the droplet is in the shape of a convex lens; the microfluidic array is arranged between the optical axis and the image sensor; the direction of the light diffracted by the laser irradiating the optical axis is from the first microfluidic chip to the droplet;
[0009] The image sensor is used to capture a first grayscale image before the optical axis moves and a second grayscale image after the optical axis moves, wherein the first grayscale image and the second grayscale image are used to detect movement information of the optical axis.
[0010] Optionally, the microfluidic unit includes 6 cuboids, the 6 cuboids form a hollow cube, the droplets are located inside the hollow cube, and one cuboid is the first microfluidic chip.
[0011] Optionally, one of the six cuboids is a second microfluidic chip; the second microfluidic chip is adjacent to the first microfluidic chip; there is a gap between the first microfluidic chip and the second microfluidic chip;
[0012] The optical table axis movement detection device based on microfluidic construction of convex lens also includes a control component;
[0013] The control component is used to control the first microfluidic chip to not apply voltage, and control the second microfluidic chip to not apply voltage, so that the droplet is located on the surface of the first microfluidic chip, and the light diffracted by the laser irradiating the optical axis passes through the droplet; or, control the first microfluidic chip to not apply voltage, and control the second microfluidic chip to apply voltage, so that the droplet moves from the surface of the first microfluidic chip to the surface of the second microfluidic chip, and the light diffracted by the laser irradiating the optical axis does not pass through the droplet.
[0014] Optionally, the four cuboids among the six cuboids except the first microfluidic chip and the second microfluidic chip are respectively a third microfluidic chip, a fourth microfluidic chip, a fifth microfluidic chip and a sixth microfluidic chip; and there are gaps between the six cuboids;
[0015] The control component is also used to control each of the six cuboids to apply voltage or not to apply voltage, so that the droplets move to the surface of the first microfluidic chip.
[0016] Optionally, the control component is specifically used to control each of the six cuboids to apply voltage or not apply voltage at preset time intervals, so that the droplets move to the surface of the first microfluidic chip.
[0017] Optionally, the control component is specifically used to uniformly control whether voltage is applied to each microfluidic chip in each microfluidic unit or not.
[0018] Optionally, the control component is specifically used to individually control whether each microfluidic chip in each of the microfluidic units is applied with voltage or not, control the first microfluidic chip in the microfluidic unit within a preset range to not be applied with voltage, control the second microfluidic chip in the microfluidic unit within a preset range to not be applied with voltage, control the first microfluidic chip in the microfluidic unit outside the preset range in the microfluidic array to not be applied with voltage, and control the second microfluidic chip in the microfluidic unit outside the preset range in the microfluidic array to apply voltage.
[0019] Optionally, the size of the first microfluidic chip is smaller than the pixel size of the image sensor.
[0020] The above-mentioned technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art: In the embodiment of the present application, the optical axis movement detection device based on microfluidics to construct a convex lens includes a microfluidic array, droplets and an image sensor, the microfluidic array includes various microfluidic units, the microfluidic unit includes a first microfluidic chip, the droplets are located on the surface of the first microfluidic chip, the droplets are in the shape of a convex lens, the microfluidic array is arranged between the optical axis and the image sensor, the direction of the light after diffraction of the laser irradiating the optical axis is from the first microfluidic chip to the droplets, the image sensor is used to collect a first grayscale image before the optical axis moves and a second grayscale image after the optical axis moves, wherein the first grayscale image and the second grayscale image are used to detect the movement information of the optical axis. This application sets a microfluidic array between the optical axis and the image sensor. The surface of the first microfluidic chip in the microfluidic array has a convex lens-shaped droplet, which is equivalent to adding a convex lens before imaging, so that the monomer pattern generated after the laser irradiates the optical axis and diffracts becomes smaller. The fixed-area image sensor can collect a larger range of light spot groups, and the probability of collecting feature points will also be greatly increased, thereby realizing the improvement of the detection accuracy of the optical axis movement detection. The problem of low detection accuracy of the current optical axis movement detection is solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0023] Figure 1 It is a schematic diagram of the movement detection principle of the optical table axis in the prior art;
[0024] Figure 2 A top view of a microfluidic array in an embodiment of the present application;
[0025] Figure 3 is a cross-sectional view of a single microfluidic unit in an embodiment of the present application;
[0026] Figure 4 The schematic diagram of the movement detection principle of the optical table axis after adding the microfluidic array and droplets in the embodiment of the present application;
[0027] Figure 5 A cross-sectional view of a single microfluidic unit in a specific embodiment of the present application;
[0028] Figure 6 Schematic diagram of the position of the droplets when no voltage is applied to the first microfluidic chip and the second microfluidic chip;
[0029] Figure 7 This is a schematic diagram of the position of droplets when no voltage is applied to the first microfluidic chip and voltage is applied to the second microfluidic chip. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0031] In an embodiment of the present application, there is provided an optical table axis movement detection device based on microfluidics to construct a convex lens, including a microfluidics array, a droplet and an image sensor;
[0032] The microfluidic array includes various microfluidic units; the microfluidic units include a first microfluidic chip; the droplets are located on the surface of the first microfluidic chip, and the droplets are in the shape of convex lenses; the microfluidic array is arranged between the optical axis and the image sensor; the direction of the light diffracted by the laser irradiating the optical axis is from the first microfluidic chip to the droplets;
[0033] The image sensor is used to collect a first grayscale image before the optical axis moves and a second grayscale image after the optical axis moves, wherein the first grayscale image and the second grayscale image are used to detect movement information of the optical axis.
[0034] like Figure 2 Shown is a top view of the microfluidic array. Figure 2 In the figure, circles represent droplets and squares represent microfluidic units. Figure 2 In the figure, the number of microfluidic units in the microfluidic array is only for illustration.
[0035] like Figure 3 Shown is a cross-sectional view of a single microfluidic unit. Figure 3 In the figure, the solid line with an arrow is the actual irradiation path of the light after diffraction from the optical axis of the laser irradiation through the first microfluidic chip and the droplets, and the dotted line with an arrow is the irradiation path of the light after diffraction from the optical axis of the laser irradiation when there are no droplets. Figure 3 In the figure, the direction of the light diffracted by the laser irradiation optical axis is from the first microfluidic chip to the droplet, and the droplet is located on the surface of the first microfluidic chip, and the droplet is in the shape of a convex lens. The droplet is located on the surface of the first microfluidic chip, and is in the shape of a convex lens due to its hydrophobicity, which will converge the received light, thereby achieving the purpose of reducing the graphic area of the light spot group.
[0036] Digital microfluidics is a technology that uses the dielectric wetting effect to precisely manipulate the generation, movement, and fusion of droplets. It has the advantages of high throughput, automation, low reagent requirements, and rapid response, and has been widely used in DNA preparation, molecular diagnosis, immunoassay, drug analysis, chemical experiments, etc. Droplets as small as nanoliters can now be manipulated. The dielectric wetting effect simply means changing the wettability of droplets by applying voltage. When no voltage is applied, the droplet is on the surface of a superhydrophobic material, with a very small contact angle, and will appear to be close to a spherical state. After the voltage is applied, the contact angle of the droplet increases, causing a pressure difference inside the droplet, which in turn causes the droplet to collapse, achieving the purpose of moving the droplet.
[0037] The droplets on the super-hydrophobic interface are natural convex lenses, and the entire microfluidic system is made of highly light-transmitting materials, with an overall light transmittance of over 95%. This means that digital microfluidics is a naturally excellent controllable lens. It can be used in existing optical systems with minimal effect on light intensity, while also converging or diverging the light path. The requirements for optical systems in existing electronic devices are increasing, with small size, low cost and high performance, among which the requirement for precision is of utmost importance. Using controllable microfluidics to assist optical systems can achieve higher precision at low cost, and is flexible and controllable. At present, there is no solution to use digital microfluidics to improve the accuracy of optical systems in electronic devices.
[0038] When no voltage is applied to the microfluidic chip, the droplets will remain approximately spherical when on the surface of the hydrophobic layer, which is equivalent to a convex lens. When voltage is applied to the microfluidic chip, the droplets will undergo an electrowetting effect, which can be simply understood as the hydrophobic layer becoming a hydrophilic layer and the droplets will collapse. By cooperating with two microfluidic chips, droplet transport can be achieved. The smallest droplet can be picoliter-level, and the intermolecular force between the droplet and the microfluidic chip is greater than the weight of the droplet itself, so even if the droplet is placed vertically, it will not cause the droplet to flow down. The size of the droplet is at the micron level, and micron-level microfluidic chips can also be manufactured through existing display production lines or MEMS.
[0039] like Figure 4 As shown, it is a schematic diagram of the movement detection principle of the optical table axis after adding the microfluidic array and droplets in the embodiment of the present application. In fact, the image sensor is stationary, and the light spot group is moving. For ease of understanding, the coordinate system is switched, showing that the light spot group is stationary, and the image sensor is moving. Figure 4 In the figure, the laser irradiates the optical axis, and a group of light spots is generated within the imaging range. The solid rectangular frame is the first grayscale image before the optical axis moves, and the dotted rectangular frame is the second grayscale image after the optical axis moves. The overlapping area of the first grayscale image and the second grayscale image is the same pattern area before and after the optical axis moves. The moving direction of the optical axis can be detected based on the first grayscale image and the second grayscale image. Figure 1 Compare, Figure 4 Microfluidic arrays have been added. Figure 4 The droplets are not drawn. For the specific relationship between the microfluidic array and the droplets, see Figure 2 and Figure 3 .from Figure 1 and Figure 4 It can be seen that Figure 4 The graphic area of the light spot group in the image is reduced. After adding the microfluidic array, the convergence effect is turned on by default, so the area of a single light spot will be reduced, and the area of the light spot group will also be reduced. The image sensor of the same area can contain more light spots, that is, more feature points, thereby achieving improved accuracy.
[0040] In a specific embodiment, the microfluidic unit includes 6 cuboids, which form a hollow cube, and the droplets are located inside the hollow cube, wherein one cuboid is the first microfluidic chip. Figure 5 As shown, it is a cross-sectional view of a single microfluidic unit in a specific embodiment of the present application. Figure 5 Only 4 cuboids are shown. Figure 5 In the video, the droplet is inside a hollow cube. The hollow cube structure can prevent the droplet from flying away due to excessive vibration of the electronic watch.
[0041] In a specific embodiment, one of the six cuboids is a second microfluidic chip; the second microfluidic chip is adjacent to the first microfluidic chip; there is a gap between the first microfluidic chip and the second microfluidic chip;
[0042] The optical table axis movement detection device based on microfluidics to construct a convex lens also includes a control component;
[0043] The control component is used to control the first microfluidic chip to not apply voltage, and control the second microfluidic chip to not apply voltage, so that the droplet is located on the surface of the first microfluidic chip, and the light diffracted by the laser irradiation optical axis passes through the droplet; or, control the first microfluidic chip to not apply voltage, and control the second microfluidic chip to apply voltage, so that the droplet moves from the surface of the first microfluidic chip to the surface of the second microfluidic chip, and the light diffracted by the laser irradiation optical axis does not pass through the droplet. Figure 6 As shown in FIG. 1 , it is a schematic diagram of the position of the droplets when no voltage is applied to the first microfluidic chip and the second microfluidic chip. Figure 7 , which is a schematic diagram of the position of droplets when no voltage is applied to the first microfluidic chip and voltage is applied to the second microfluidic chip.
[0044] When no voltage is applied to the first microfluidic chip and the second microfluidic chip, the droplet is located on the surface of the first microfluidic chip. Due to the hydrophobicity, it is in the shape of a convex lens, which will converge the received light and achieve the purpose of reducing the area of the light spot pattern. When no voltage is applied to the first microfluidic chip and voltage is applied to the second microfluidic chip, the droplet will crawl to the surface of the second microfluidic chip due to the electrowetting effect and finally adhere to the surface of the second microfluidic chip. At this time, the light passing through the first microfluidic chip will not be affected. This provides a more flexible option for the application of this solution, and you can choose to use a convex lens or not.
[0045] In a specific embodiment, the four cuboids except the first microfluidic chip and the second microfluidic chip among the six cuboids are respectively the third microfluidic chip, the fourth microfluidic chip, the fifth microfluidic chip and the sixth microfluidic chip; there are gaps between the six cuboids;
[0046] The control component is also used to control each of the six cuboids to apply voltage or not to apply voltage so that the droplets move to the surface of the first microfluidic chip.
[0047] The six cuboids are all microfluidic chips. When droplets run to four of the six cuboids except the first microfluidic chip and the second microfluidic chip due to excessive vibration, or are broken into small droplets and fly to four of the six cuboids except the first microfluidic chip and the second microfluidic chip, the droplets can be controlled to add voltage or not add voltage to each of the six cuboids so that they finally converge and move to the surface of the first microfluidic chip.
[0048] In a specific embodiment, the control component is specifically used to control each of the six cuboids to apply voltage or not apply voltage at preset time intervals, so that the droplets move to the surface of the first microfluidic chip.
[0049] A fixed droplet recovery process is performed periodically to ensure that the droplets are located on the surface of the first microfluidic chip.
[0050] In a specific embodiment, the control component is specifically used to uniformly control whether voltage is applied to each microfluidic chip in each microfluidic unit or not.
[0051] For example, the first microfluidic chip and the second microfluidic chip in each microfluidic unit are uniformly controlled to have no voltage applied, or the first microfluidic chip in each microfluidic unit is uniformly controlled to have no voltage applied and the second microfluidic chip is uniformly controlled to have voltage applied.
[0052] In a specific embodiment, the control component is specifically used to individually control each microfluidic chip in each microfluidic unit to apply voltage or not, control the first microfluidic chip in the microfluidic unit within the preset range to not apply voltage, control the second microfluidic chip in the microfluidic unit within the preset range to not apply voltage, control the first microfluidic chip in the microfluidic unit outside the preset range in the microfluidic array to not apply voltage, and control the second microfluidic chip in the microfluidic unit outside the preset range in the microfluidic array to apply voltage. The droplets in the microfluidic unit within the preset range are located on the surface of the first microfluidic chip, and the droplets in the microfluidic unit outside the preset range in the microfluidic array are located on the surface of the second microfluidic chip, and the microfluidic units and droplets within the preset range play a role of local shrinkage.
[0053] In a specific embodiment, the size of the first microfluidic chip is smaller than the pixel size of the image sensor. Because the pixel corresponds to the light spot, the size of the first microfluidic chip is smaller than the pixel size of the image sensor, and the light spot is divided into blocks using multiple convex lenses to reduce the light spot feature points as evenly as possible.
[0054] In summary, this application sets a microfluidic array between the optical axis and the image sensor. The surface of the first microfluidic chip in the microfluidic array has a convex lens-shaped droplet, which is equivalent to adding a convex lens before imaging, so that the monomer pattern generated after the laser irradiates the optical axis and diffracts becomes smaller. The fixed-area image sensor can collect a larger range of light spot groups, and the probability of collecting feature points will also be greatly increased, thereby realizing the improvement of the detection accuracy of the optical axis movement detection. The problem of low detection accuracy of the current optical axis movement detection is solved.
[0055] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0056] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. An optical table axis movement detection device based on microfluidics to construct a convex lens, characterized in that: including microfluidic arrays, droplets, and image sensors; The microfluidic array includes various microfluidic units; the microfluidic unit includes a first microfluidic chip; the droplet is located on the surface of the first microfluidic chip, and the droplet is in the shape of a convex lens; the microfluidic array is arranged between the optical axis and the image sensor; the direction of the light diffracted by the laser irradiating the optical axis is from the first microfluidic chip to the droplet; The image sensor is used to capture a first grayscale image before the optical axis moves and a second grayscale image after the optical axis moves, wherein the first grayscale image and the second grayscale image are used to detect movement information of the optical axis.
2. The optical table axis movement detection device based on microfluidic construction of convex lens according to claim 1 is characterized in that: The microfluidic unit includes 6 cuboids, which form a hollow cube. The droplets are located inside the hollow cube, wherein one cuboid is the first microfluidic chip.
3. The optical table axis movement detection device based on microfluidic construction of convex lens according to claim 2 is characterized in that: One of the six cuboids is a second microfluidic chip; the second microfluidic chip is adjacent to the first microfluidic chip; there is a gap between the first microfluidic chip and the second microfluidic chip; The optical table axis movement detection device based on microfluidic construction of convex lens also includes a control component; The control component is used to control the first microfluidic chip to not apply voltage, and control the second microfluidic chip to not apply voltage, so that the droplet is located on the surface of the first microfluidic chip, and the light diffracted by the laser irradiating the optical axis passes through the droplet; or, control the first microfluidic chip to not apply voltage, and control the second microfluidic chip to apply voltage, so that the droplet moves from the surface of the first microfluidic chip to the surface of the second microfluidic chip, and the light diffracted by the laser irradiating the optical axis does not pass through the droplet.
4. The optical table axis movement detection device based on microfluidic construction of convex lens according to claim 3 is characterized in that: The four cuboids among the six cuboids except the first microfluidic chip and the second microfluidic chip are respectively the third microfluidic chip, the fourth microfluidic chip, the fifth microfluidic chip and the sixth microfluidic chip; there are gaps between the six cuboids; The control component is also used to control each of the six cuboids to apply voltage or not to apply voltage, so that the droplets move to the surface of the first microfluidic chip.
5. The optical table axis movement detection device based on microfluidic construction of convex lens according to claim 4 is characterized in that: The control component is specifically used to control each of the six cuboids to apply voltage or not apply voltage at preset time intervals, so that the droplets move to the surface of the first microfluidic chip.
6. The optical table axis movement detection device based on microfluidic construction of convex lens according to claim 3 is characterized in that: The control component is specifically used to uniformly control each microfluidic chip in each microfluidic unit to apply voltage or not apply voltage.
7. The optical table axis movement detection device based on microfluidic construction of convex lens according to claim 3 is characterized in that: The control component is specifically used to individually control whether each microfluidic chip in each microfluidic unit is added with voltage or not, control the first microfluidic chip in the microfluidic unit within a preset range to not be added with voltage, control the second microfluidic chip in the microfluidic unit within a preset range to not be added with voltage, control the first microfluidic chip in the microfluidic unit outside the preset range in the microfluidic array to not be added with voltage, and control the second microfluidic chip in the microfluidic unit outside the preset range in the microfluidic array to be added with voltage.
8. The optical table axis movement detection device based on microfluidic construction of convex lens according to any one of claims 1 to 7, characterized in that: The size of the first microfluidic chip is smaller than the pixel size of the image sensor.