A reading and writing sitting posture monitoring desktop device based on phased array infrared device

Abstract

The present invention relates to the field of sitting posture monitoring technology, and in particular to a reading and writing sitting posture monitoring desktop device based on a phased array infrared device. Its technical solution includes: the phased array infrared system is composed of a carrier and an infrared ranging unit, and the infrared ranging unit is evenly distributed on the carrier. The combined lens system includes a fixed lens module and a variable lens module, and the variable lens module is composed of a No. 3 convex lens and a No. 5 convex lens. The No. 3 convex lens is used for measuring range adjustment, and the No. 5 convex lens is used for measuring azimuth adjustment. The No. 3 convex lens moves along the optical axis, and the No. 5 convex lens moves in a plane perpendicular to the optical axis. The present invention has the advantages of high-precision measurement capability, flexible measurement range and azimuth adjustment, real-time target positioning and tracking, multi-dimensional data acquisition and analysis, personalized user experience, and a wide range of application fields, and provides users with an efficient, accurate, and reliable sitting posture monitoring and evaluation solution.

Description

Technical Field

[0001] The invention relates to the technical field of sitting posture monitoring, and in particular to a reading and writing sitting posture monitoring desktop device based on a phased array infrared device. Background Art

[0002] Reading and writing sitting posture refers to the body posture presented during activities such as reading, writing or using a computer. A good reading and writing sitting posture is very important for protecting eyesight, preventing cervical spondylosis, relieving shoulder and neck fatigue, and improving work efficiency. Reading and writing sitting posture monitoring refers to the use of technical means to monitor and evaluate the user's sitting posture in real time during activities such as reading, writing or using a computer, so as to remind users to maintain good sitting habits and prevent health problems caused by poor posture. Although there are ranging devices at this stage, the ranging devices based on infrared and ultrasound at this stage have the problem of limited sensor scanning range, so it is difficult to accurately measure the distance to the target. The multi-sensor solution also has the problem of limited number of sensors (usually less than 3), and there is no function of aligning the target, so it cannot accurately identify the human eye and accurately measure the distance; the ranging device based on the camera needs to identify the target through the image processing algorithm, and the current intelligent algorithm based on image processing for human eye recognition or posture recognition requires a large computing power, so there is a high cost and difficulty in implementation, and there is a problem of peeping into the user's privacy, which makes it difficult to be widely used among the crowd; the mechanical structure of the equipment based on the pan-tilt is relatively complex and easy to damage. In view of the fact that the existing technologies either have the problem of inaccurate measurement or the problem of excessive cost, there is a need for a measurement device and method that can accurately obtain key points such as human eyes, head, shoulders, etc., and is low-cost and easy to obtain, to solve the above problems. Summary of the invention

[0003] The present invention provides a reading and writing sitting posture monitoring desktop device based on a phased array infrared device, which solves the above-mentioned technical problems.

[0004] The solution of the present invention to solve the above technical problems is as follows:

[0005] A reading and writing sitting posture monitoring desktop device based on a phased array infrared device comprises a phased array infrared system and a combined lens system. The phased array infrared system consists of a carrier and an infrared ranging unit, and the infrared ranging unit is evenly distributed on the carrier. The combined lens system comprises a fixed lens module and a variable lens module, and the variable lens module consists of a No. 3 convex lens and a No. 5 convex lens. The No. 3 convex lens is used for measuring range adjustment, and the No. 5 convex lens is used for measuring azimuth adjustment. The No. 3 convex lens moves along the optical axis direction, and the No. 5 convex lens moves in a plane perpendicular to the optical axis.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the fixed lens module consists of a No. 1 convex lens, a No. 2 concave lens and a No. 4 concave lens, and the No. 1 convex lens and the No. 2 concave lens have the same focal length, and the No. 3 convex lens and the No. 4 concave lens have the same focal length.

[0008] Furthermore, the first convex lens, the second concave lens, the third convex lens and the fourth concave lens are assembled on the same optical axis, and the optical axis is in the normal direction of the carrier.

[0009] Furthermore, there are 25 infrared ranging units in total, and each infrared ranging unit can emit and receive infrared rays independently, and calculate the distance of the aligned object by measuring the time difference between reception and emission. The phases and wavelengths of infrared rays emitted by different infrared ranging units are different, so the emission source of the reflected infrared rays can be distinguished to avoid confusion.

[0010] Furthermore, the phased array infrared system can emit 25 infrared beams simultaneously and return 5*5 depth information of the target area.

[0011] A reading and writing sitting posture detection process based on a phased array infrared device includes the following steps:

[0012] S1. Target rough positioning: When the phased array infrared system is activated, 25 infrared beams are continuously emitted at short intervals to start distance measurement. First, the third convex lens (5) moves to the position of the fourth concave lens to maximize the measurement range and perform measurement. At this time, the fixed lens module (3) and the variable lens module (4) are on the same optical axis. Subsequently, the optical axis of the fifth convex lens (6) moves to a distance r from the optical axis of the fourth concave lens and rotates around the optical axis of the fourth concave lens. The distance is measured every 30° rotation, and a total of 12 distance measurements are made. Then, the third convex lens (5) is gradually adjusted to a position away from the fourth concave lens. Each time the adjustment is made, the above measurement steps are repeated to obtain point cloud distribution data with lower resolution in space. The point cloud distribution data can be used with a machine learning model to obtain the approximate position of the human target.

[0013] S2. Target precision measurement: After obtaining the human target position, the position decoupling algorithm is used to calculate the corresponding adjustment positions of the No. 3 convex lens and the No. 5 convex lens. After adjusting the No. 3 convex lens and the No. 5 convex lens to the corresponding positions, the positions are fine-tuned to obtain denser point cloud data. The positions of the eyes, head, chest and shoulders are analyzed through the deep learning graph network model to obtain precise three-dimensional coordinates of the target. At the same time, the device can also measure the coordinates of the desktop to prepare for the calculation of reading and writing sitting postures.

[0014] S3. Reading and writing distance calculation and sitting posture calculation: After obtaining the eye, head, chest and shoulder position data of the human body, as well as the desktop coordinates, the device will embed a calculation formula to calculate the relative distance between the eyes and the desktop; at the same time, it can calculate the relative position of the head, chest, shoulders and their relative position to the desktop, thereby giving an assessment of the sitting posture.

[0015] The beneficial effects of the present invention are:

[0016] High-precision measurement capability: Phased array infrared systems can simultaneously transmit multiple infrared beams and calculate the distance of the target object by measuring the time difference between reception and transmission. This technology can provide highly accurate distance information, allowing the device to monitor the target location with high accuracy.

[0017] Flexible measurement range and azimuth adjustment: By adjusting the convex lens and concave lens in the lens system, the device can flexibly adjust the measurement range and azimuth. This means it can adapt to targets of different sizes and postures, and can achieve accurate monitoring in different working scenarios.

[0018] Real-time target positioning and tracking: The device can monitor the position and posture of the target in real time, and use machine learning models to perform rough positioning and fine measurement of the target. This real-time target positioning and tracking function allows the device to provide timely feedback on the target's location information, providing an accurate basis for subsequent data analysis and processing.

[0019] Multi-dimensional data acquisition and analysis: In addition to the target's three-dimensional coordinate information, the device can also obtain the relative position of each part of the target and the desktop. This multi-dimensional data acquisition allows the device to perform a more comprehensive target analysis, not only to evaluate the sitting posture, but also to analyze the target's posture and movements.

[0020] Personalized user experience: Through the built-in calculation formula, the device can calculate the relative distance between the eyes and the desktop based on the target's position data, thereby evaluating whether the user's sitting posture conforms to good habits. This personalized user experience enables the device to provide users with personalized health management and posture correction services.

[0021] Wide range of applications: This device can not only be used for reading and writing sitting posture monitoring, but also can be applied to other fields such as medical health, sports training, human-computer interaction, etc. Its high-precision monitoring capability and flexible adjustment function enable it to play an important role in various application scenarios and has a high application prospect.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] In the attached picture:

[0025] Figure 1 It is a schematic diagram of the phased array infrared system of the present invention;

[0026] Figure 2 is a schematic diagram of a combined lens system of the present invention;

[0027] Figure 3 A schematic diagram of adjusting the measurement range of the combined lens system of the present invention;

[0028] Figure 4 A schematic diagram of measuring azimuth adjustment of the combined lens system of the present invention;

[0029] Figure 5 It is a schematic diagram of the sitting posture detection process of the present invention.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1. Carrier; 2. Infrared ranging unit; 3. Fixed lens module; 4. Variable lens module; 5. Convex lens No. 3; 6. Convex lens No. 5. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 5 As shown, the embodiments provided by the present invention are:

[0034] A read-write sitting posture monitoring desktop device based on a phased array infrared device includes a phased array infrared system and a combined lens system. The phased array infrared system can emit 25 infrared beams at the same time and return 5*5 depth information for the target area. The phased array infrared system can emit 25 infrared beams at the same time and can cover a large target area in a short time. This efficient data acquisition capability can improve the response speed and work efficiency of the system. By emitting multiple infrared beams at the same time, the system can realize simultaneous monitoring and tracking of multiple targets. This design can improve the multi-target processing capability of the system and is suitable for scenes that need to monitor multiple targets at the same time. The phased array infrared system returns 5*5 depth information for the target area with a higher resolution. This means that the system can provide more detailed and accurate target depth information, which helps to achieve more accurate distance measurement and three-dimensional reconstruction. Each reflection point in the area can calculate the real world coordinates through the refraction relationship of the lens, so that it appears in the form of a three-dimensional point cloud. After obtaining the three-dimensional point cloud, the human body can be identified through an intelligent algorithm. At the same time, the system will control the movement of the lens so that the light beam cluster generated by the infrared array is focused on the human body and detects the human body area. By returning 5*5 depth information, the system can achieve full coverage of the target area. This design ensures that the system can obtain the depth information of the target in all directions, improving the comprehensiveness and reliability of the system. Since the system has high data acquisition capabilities and resolution, it has good applicability in various application scenarios. Whether in indoor environments or outdoor scenes, accurate depth information acquisition and analysis can be achieved through this design. The phased array infrared system consists of a carrier 1 and an infrared ranging unit 2. The infrared ranging unit 2 is evenly distributed on the carrier 1. There are 25 infrared ranging units 2, and each infrared ranging unit 2 can emit and receive infrared rays separately. The distance of the aligned object is calculated by measuring the time difference between receiving and transmitting. The phases and wavelengths of infrared rays emitted by different infrared ranging units 2 are different, so the emission source of the reflected infrared rays can be distinguished to avoid confusion. Each infrared ranging unit 2 can independently emit and receive infrared rays. The distance of the target object can be calculated by measuring the time difference between transmitting and receiving. This design can achieve high-precision distance measurement and provide accurate ranging results. The infrared rays emitted by different infrared ranging units 2 have different phases and wavelengths, and the emission source of the reflected infrared rays can be distinguished. This can avoid confusion and interference, and improve the accuracy and reliability of the measurement. Since each infrared ranging unit 2 can work independently and has strong anti-interference ability, it is suitable for distance measurement in complex environments, such as situations where the light is uneven or there are other interference sources. By combining multiple infrared ranging units 2 together, simultaneous tracking and measurement of multiple targets can be achieved. This design can improve the multi-target processing capability of the device and is suitable for scenes where multiple targets need to be monitored simultaneously.Since each infrared ranging unit 2 can work independently, the system has high flexibility and scalability. The user can increase or decrease the number of infrared ranging units 2 as needed to meet the distance measurement requirements in different scenarios. The combined lens system includes a fixed lens module 3 and a variable lens module 4. The fixed lens module 3 is composed of a convex lens No. 1, a concave lens No. 2 and a concave lens No. 4, and the convex lens No. 1 and the concave lens No. 2 have the same focal length, and the convex lens No. 3 5 has the same focal length as the concave lens No. 4. The fixed lens module 3 uses a combination of a convex lens No. 1, a concave lens No. 2 and a concave lens No. 4. Among them, the focal lengths of the convex lens No. 1 and the concave lens No. 2 are the same, and the focal lengths of the convex lens No. 3 5 and the concave lens No. 4 are also the same. This design can effectively adjust the focusing effect of light, making the imaging quality of the optical system more stable and clear. By ensuring that the focal lengths of the convex lens and the concave lens are the same, the design and adjustment of the optical system can be simplified. This design can reduce the number and complexity of optical components and improve the stability and reliability of the system. When the light passes through the convex lens No. 1 and the concave lens No. 2, a certain focusing effect will be produced, making the light beam more concentrated and clear. This beam focusing effect can improve the penetration and measurement accuracy of the infrared beam, thereby enhancing the performance of the equipment. The fixed lens module 3 has a simple design and excellent optical performance, and is suitable for a variety of optical systems and application scenarios. Whether in industrial measurement, medical imaging or scientific research, this design can achieve stable and efficient optical imaging. The fixed lens module 3 uses standardized optical elements with the same focal length, so it is more convenient for maintenance and adjustment. The user can adjust and optimize the lens module through simple operations to ensure the stability and performance durability of the system. The No. 1 convex lens, the No. 2 concave lens, the No. 3 convex lens 5 and the No. 4 concave lens are assembled on the same optical axis, and the optical axis is in the normal direction of the slide 1. Assembling all lenses on the same optical axis can ensure the stability and consistency of the optical path. This can reduce the optical path deviation and error in the optical system and improve the stability and accuracy of imaging. Since all lenses are on the same optical axis, it is easier to align and calibrate the optical elements during assembly and adjustment. This saves adjustment time and improves production efficiency. By ensuring that all lenses are on the same optical axis, the performance consistency of the optical system can be guaranteed. This can reduce distortion and chromatic aberration in optical imaging and improve imaging quality and accuracy. The optical axis is in the normal direction of the slide 1, which simplifies the design and adjustment of the optical system. This simple optical path design can reduce the number and complexity of optical components, reduce the cost and maintenance difficulty of the system. Assembling all lenses on the same optical axis can make the optical system more compact. This can reduce the volume and weight of the optical system and improve the portability and application flexibility of the equipment. Due to the simple design of the optical path and the good alignment of the optical components, the transmission loss of the light beam in the optical system is small. This can improve the transmission efficiency of the infrared light beam and improve the performance and reliability of the equipment.

[0035] The variable lens module 4 is composed of a convex lens No. 3 5 and a convex lens No. 5 6. The convex lens No. 3 5 is used for measuring range adjustment. After the infrared light beam is excited by the infrared ranging unit 2 in the phased array infrared carrier 1, it is shot into the convex lens No. 1 parallel to the optical axis. Since the convex lens No. 1 and the concave lens No. 2 have the same focal length, the light path is still parallel light after being emitted from the concave lens No. 2, but a convergence effect is produced, making each infrared beam more concentrated, so that the distance measurement point is more accurate. After the light beam is emitted from the concave lens No. 2, it is shot into the convex lens No. 3 5. After the light path is refracted, it is emitted from the concave lens No. 4. Since the convex lens No. 3 5 and the concave lens No. 4 have the same focal length, the light emitted from the concave lens No. 4 is still parallel light. Since the third convex lens 5 can move along the optical axis, when it moves to a direction away from the phased array infrared carrier 1, the light is not concentrated to a small extent, and after being emitted by the fifth convex lens 6, the measurement range of a certain fixed distance is d1; when the third convex lens 5 moves to a direction close to the phased array infrared carrier 1, the light is concentrated to a large extent, and after being emitted by the fifth convex lens 6, the measurement range of the same fixed distance is d2. Therefore, the third convex lens 5 can play a role in adjusting the measurement range of the phased array infrared array.

[0036] Convex lens No. 5 6 is used for measuring azimuth adjustment. When convex lens No. 1, concave lens No. 2, convex lens No. 3 5 and concave lens No. 4 are fixed, convex lens No. 5 6 can move in the direction perpendicular to the optical axis. Since the light beam incident on convex lens No. 5 6 is parallel light, the light beams emitted from convex lens No. 5 6 all pass through the focus of convex lens No. 5 6. When the position of convex lens No. 5 6 is moved, the focus position of convex lens No. 5 6 will change, so that the intersection point where the light beams converge will also change, so that the measurement azimuth of the same fixed distance will change. Therefore, the No. 5 convex lens 6 can play the role of adjusting the measurement orientation of the phased array infrared array. The No. 3 convex lens 5 moves along the optical axis, and the No. 5 convex lens 6 moves in the plane perpendicular to the optical axis. In summary, the 25 infrared beams emitted by the phased array infrared array can measure the distance of 25 points at the same time. By adjusting the No. 3 convex lens 5 and the No. 5 convex lens 6, the 25 points measured by the phased array infrared array can change different measurement ranges and orientations. After multiple measurements, point cloud data of any resolution and position in space can be obtained. Prepare to locate the target and obtain the position of the key points of the target. After the target is located, the system will control the movement of the lens again. The lens drives the infrared array to gather and diverge the beam group to achieve more intensive target surface position acquisition and distance measurement. After obtaining the distance information, a point cloud concentrated on the human body is formed. The intelligent detection algorithm is used to realize the world position coordinate calculation of key points such as eyes, head, chest, and shoulders.

[0037] A reading and writing sitting posture monitoring desktop device based on a phased array infrared device is used:

[0038] High-precision measurement capability: Phased array infrared systems can simultaneously transmit multiple infrared beams and calculate the distance of the target object by measuring the time difference between reception and transmission. This technology can provide highly accurate distance information, allowing the device to monitor the target location with high accuracy.

[0039] Flexible measurement range and azimuth adjustment: By adjusting the convex lens and concave lens in the lens system, the device can flexibly adjust the measurement range and azimuth. This means it can adapt to targets of different sizes and postures, and can achieve accurate monitoring in different working scenarios.

[0040] Real-time target positioning and tracking: The device can monitor the position and posture of the target in real time, and use machine learning models to perform rough positioning and fine measurement of the target. This real-time target positioning and tracking function allows the device to provide timely feedback on the target's location information, providing an accurate basis for subsequent data analysis and processing.

[0041] Multi-dimensional data acquisition and analysis: In addition to the target's three-dimensional coordinate information, the device can also obtain the relative position of each part of the target and the desktop. This multi-dimensional data acquisition allows the device to perform a more comprehensive target analysis, not only to evaluate the sitting posture, but also to analyze the target's posture and movements.

[0042] Personalized user experience: Through the built-in calculation formula, the device can calculate the relative distance between the eyes and the desktop based on the target's position data, thereby evaluating whether the user's sitting posture conforms to good habits. This personalized user experience enables the device to provide users with personalized health management and posture correction services.

[0043] Wide range of applications: This device can not only be used for reading and writing sitting posture monitoring, but also can be applied to other fields such as medical health, sports training, human-computer interaction, etc. Its high-precision monitoring capability and flexible adjustment function enable it to play an important role in various application scenarios and has a high application prospect.

[0044] A reading and writing sitting posture detection process based on a phased array infrared device includes the following steps:

[0045] S1. Target rough positioning: When the phased array infrared system is excited, 25 infrared beams are continuously emitted at very short intervals to start ranging. First, the third convex lens 5 is adjusted to a position close to the fourth concave lens to maximize the measurement range and measure. At this time, the fixed lens module 3 and the variable lens module 4 are on the same optical axis. Then, the optical axis of the fifth convex lens 6 is moved to a distance r from the optical axis of the fourth concave lens and rotated around the optical axis of the fourth concave lens. The distance is measured every 30° rotation, and a total of 12 distance measurements are made. Then, the third convex lens 5 is gradually adjusted to a position away from the fourth concave lens. Each time the adjustment is repeated, the above measurement steps are repeated to obtain a point cloud distribution with lower resolution in space. The point cloud data can be used with a machine learning model to obtain the approximate position of the human target.

[0046] S2. Target precise measurement: After obtaining the human target position, the position decoupling algorithm is used to calculate the corresponding adjustment positions of the third convex lens 5 and the fifth convex lens 6. After adjusting the third convex lens 5 and the fifth convex lens 6 to the corresponding positions, the positions are fine-tuned to obtain denser point cloud data. The positions of the eyes, head, chest and shoulders are analyzed through the deep learning graph network model to obtain precise three-dimensional coordinates of the target. At the same time, the device can also measure the coordinates of the desktop to prepare for the calculation of reading and writing sitting postures.

[0047] S3. Reading and writing distance calculation and sitting posture calculation: After obtaining the eye, head, chest and shoulder position data of the human body, as well as the desktop coordinates, the device will embed a calculation formula to calculate the relative distance between the eyes and the desktop; at the same time, it can calculate the relative position of the head, chest, shoulders and their relative position to the desktop, thereby giving an assessment of the sitting posture.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A reading and writing sitting posture monitoring desktop device based on a phased array infrared device, characterized in that: The invention comprises a phased array infrared system and a combined lens system, wherein the phased array infrared system is composed of a carrier (1) and an infrared distance measuring unit (2), wherein the infrared distance measuring unit (2) is evenly distributed on the carrier (1), and the combined lens system comprises a fixed lens module (3) and a variable lens module (4), wherein the variable lens module (4) is composed of a No. 3 convex lens (5) and a No. 5 convex lens (6), wherein the No. 3 convex lens (5) is used for adjusting the measurement range, and the No. 5 convex lens (6) is used for adjusting the measurement azimuth, wherein the No. 3 convex lens (5) moves along the optical axis direction, and the No. 5 convex lens (6) moves in a plane perpendicular to the optical axis; The reading and writing posture detection process includes the following steps: S1. Target rough positioning: When the phased array infrared system is activated, 25 infrared beams are continuously emitted at very short intervals to start distance measurement. First, the third convex lens (5) is adjusted to a position close to the fourth concave lens to maximize the measurement range and perform measurement. At this time, the fixed lens module (3) and the variable lens module (4) are on the same optical axis. Subsequently, the optical axis of the fifth convex lens (6) is moved to a distance r from the optical axis of the fourth concave lens and rotated around the optical axis of the fourth concave lens. The distance is measured every 30° rotation, and a total of 12 distance measurements are made. Then, the third convex lens (5) is gradually adjusted to a position away from the fourth concave lens. Each time the adjustment is repeated, the above measurement steps are repeated to obtain a point cloud distribution with a lower resolution in space. The point cloud data can be used with a machine learning model to obtain the approximate position of the human target. S2. Target precision measurement: After obtaining the human target position, the position decoupling algorithm is used to calculate the corresponding adjustment positions of the third convex lens (5) and the fifth convex lens (6). After adjusting the third convex lens (5) and the fifth convex lens (6) to the corresponding positions, the positions are fine-tuned to obtain denser point cloud data. The positions of the eyes, head, chest and shoulders are analyzed through the deep learning graph network model to obtain the precise three-dimensional coordinates of the target. At the same time, the device can also measure the coordinates of the desktop to prepare for the calculation of the reading and writing sitting posture. S3. Reading and writing distance calculation and sitting posture calculation: After obtaining the eye, head, chest and shoulder position data of the human body, as well as the desktop coordinates, the device will embed a calculation formula to calculate the relative distance between the eyes and the desktop; at the same time, it can calculate the relative position of the head, chest, shoulders and their relative position to the desktop, thereby giving an assessment of the sitting posture.

2. According to claim 1, a reading and writing sitting posture monitoring desktop device based on a phased array infrared device is characterized in that: The fixed lens module (3) is composed of a No. 1 convex lens, a No. 2 concave lens and a No. 4 concave lens, and the No. 1 convex lens and the No. 2 concave lens have the same focal length, and the No. 3 convex lens (5) and the No. 4 concave lens have the same focal length.

3. According to claim 2, a reading and writing sitting posture monitoring desktop device based on a phased array infrared device is characterized in that: The first convex lens, the second concave lens, the third convex lens (5) and the fourth concave lens are assembled on the same optical axis, and the optical axis is in the normal direction of the carrier (1).

4. According to claim 1, a reading and writing sitting posture monitoring desktop device based on a phased array infrared device is characterized in that: A total of 25 infrared distance measuring units (2) are provided, and each infrared distance measuring unit (2) can independently transmit and receive infrared rays, and calculate the distance of the aligned object by measuring the time difference between reception and transmission. The phases and wavelengths of infrared rays emitted by different infrared distance measuring units (2) are different, so the emission source of the reflected infrared rays can be distinguished to avoid confusion.

5. According to claim 1, a reading and writing sitting posture monitoring desktop device based on a phased array infrared device is characterized in that: The phased array infrared system can emit 25 infrared beams simultaneously and return 5*5 depth information of the target area.

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