Chair and sedentariness detection reminding control method thereof

Abstract

The invention provides a chair and a sedentariness detection reminding control method thereof.A timer is arranged in a controller of the chair, a sensor used for detecting whether a human body sits or not is arranged on a chair seat of the chair, and the sensor is connected with the controller; the method comprises the following steps that S1, the controller receives a detection signal sent by the sensor and judges whether a person sits down or not according to the detection signal; s2, if yes, the controller controls a waist support ejection mechanism to eject the waist support forwards, and the step S3 is executed; if not, changing the sedentariness time t into an initial value, and returning to the step S1; s3, the controller controls the timer to start sedentariness time t, and when the sedentariness time t reaches a set time threshold value T0, the step S4 is executed; and S4, the controller controls the waist support ejection mechanism to drive the waist support to perform a sedentariness reminding action, the sedentariness timing t becomes an initial value, and the step S3 is returned to. According to the scheme, whether the user sits for a long time or not is judged through the controller and the timer, simple and effective long-time sitting reminding is carried out on the user through the action change of the waist support, and the cost is low.

Description

Technical Field

[0001] This invention relates to the field of furniture, and more particularly to a chair and a method for detecting and reminding users of prolonged sitting. Background Technology

[0002] Currently, chairs on the market have relatively limited functions. With the increasing number of people working indoors and prolonged sitting becoming more common, single-function chairs, especially office chairs, cannot meet the growing demand for comfort. Maintaining a seated posture for extended periods can lead to stiff back muscles, increased cervical spine pressure, chronic pain, significantly reduced basal metabolic rate, increased blood viscosity, and decreased cardiovascular function. Various posture recognition systems have been developed, such as the electric lumbar massage office chair and its massage control method disclosed in patent application CN118542545A. This method uses matrix pressure sensors and radar sensors to collect data, establishes a lumbar fatigue prediction model, automatically detects and actively activates the massage function, and reminds the user to adjust their posture. However, this massage control method is very complex, requiring powerful computing support for real-time analysis. Applying it to different types of chairs requires readjusting the layout and number of matrix pressure sensors and radar sensors, and re-establishing the posture fatigue statistical model. This makes it difficult to quickly deploy or adapt to different chairs, resulting in high costs. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a chair and a method for detecting and reminding users of prolonged sitting. This method is simple, effective, and can be quickly and cost-effectively deployed in various types of chairs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for detecting and reminding users of a chair's prolonged sitting function, comprising a timer in the chair's controller and a sensor on the chair seat for detecting whether a person is sitting down, the sensor being connected to the controller, and the method including the following steps:

[0006] S1. The controller receives the detection signal sent by the sensor and determines whether someone has sat down based on the detection signal;

[0007] S2. If yes, the controller controls the lumbar support ejection mechanism to eject the lumbar support 3 forward and proceeds to step S3; if no, the sedentary timer t returns to its initial value and returns to step S1.

[0008] S3. The controller controls the timer to start the sedentary timer t. When the sedentary timer t reaches the set time threshold T0, proceed to step S4.

[0009] S4. The controller controls the lumbar support extension mechanism to drive the lumbar support 3 to perform a prolonged sitting reminder action, the prolonged sitting timer t becomes the initial value, and returns to step S3.

[0010] Preferably, in step S4, the sedentary reminder action includes a retraction action, a stop action, and an extension action; wherein the duration of the retraction action is T1, the duration of the stop action is T2, and the duration of the extension action is T3.

[0011] Preferably, the duration of the retraction action T1, the duration of the stopping action T2, and the duration of the extension action T3 are 3s to 10s, respectively.

[0012] Preferably, in step S4, the sedentary reminder action includes at least two extension actions, wherein the duration of each extension action is T3, and the duration of each extension action T3 is 3s to 10s.

[0013] Preferably, the chair seat is also equipped with a lumbar massage mechanism, which is installed on the lumbar support and connected to a controller; when the controller determines that no one is sitting down, the lumbar massage mechanism is set to not be activated.

[0014] Preferably, in step S4, after the controller controls the lumbar support ejection mechanism to drive the lumbar support to perform a prolonged sitting reminder action, the controller controls the lumbar massage mechanism to perform a massage action. The duration of the massage action is T4, which is 1 min to 15 min.

[0015] Preferably, the sensor includes an infrared emitting tube and an infrared receiving module. The infrared emitting tube emits an infrared signal, and the infrared receiving module receives the infrared signal emitted by the infrared emitting tube and then outputs a level transition to the controller.

[0016] Preferably, if the controller receives 10 to 30 level transitions within 1 second, the controller determines that no one is sitting down; otherwise, the controller determines that someone is sitting down.

[0017] A chair employing the sedentary detection and reminder control method described above includes:

[0018] The chair seat has a sensor transmitter and a sensor receiver installed on opposite sides of the inner wall of the seat. The sensor receiver can convert the signal emitted by the sensor transmitter into an electrical signal and output it to the controller.

[0019] The mounting bracket is used to securely install the chair seat.

[0020] The lumbar support is mounted on the mounting bracket in a way that allows it to slide back and forth via a lumbar support ejection mechanism.

[0021] The controller is connected to the lumbar support ejection mechanism.

[0022] Preferably, the chair seat is fixedly provided with a first light shield surrounding the infrared emitting tube and a second light shield surrounding the infrared receiving module; and / or, a blocking member is movably provided on the chair seat, the blocking member moving in position after being pressed on the upper surface of the chair seat to block or connect the signal transmission between the infrared emitting tube and the infrared receiving module.

[0023] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0024] 1. This invention sets a timer connected to the controller. When the controller detects that someone has sat down, the controller controls the timer to start the prolonged sitting timer t, and the prolonged sitting reminder function is turned on. When the prolonged sitting timer t reaches the set time threshold T0, the controller controls the lumbar support ejection mechanism to drive the lumbar support to perform the prolonged sitting reminder action. Through the change of the lumbar support's movement, the user is reminded of prolonged sitting. The reminder method is simple and effective, and can be quickly and cost-effectively replicated on different seats.

[0025] 2. In this invention, the massage mechanism can only be activated after the human body is detected in place, thereby preventing the massage function from being turned on when no one is using it. This ensures that the massage function can be activated in time when the user needs a massage, and works well with the user's sitting position. After the lumbar support push-out mechanism drives the lumbar support to perform a prolonged sitting reminder action, the controller can further control the lumbar massage mechanism to continuously massage the user's lumbar region, so as to massage and relax the user's lumbar region after prolonged sitting. Attached Figure Description

[0026] Figure 1 This is a flowchart of the sedentary detection and reminder control method of Embodiment 1 of the present invention;

[0027] Figure 2 This is a flowchart of the sedentary detection and reminder control method according to Embodiment 2 of the present invention;

[0028] Figure 3 This is a schematic diagram of the process by which the controller determines whether someone has sat down in S1 of the sedentary detection and reminder control method of the present invention.

[0029] Figure 4 This is a schematic diagram of the chair structure in this invention;

[0030] Figure 5 This is a schematic diagram of the chair seat structure in this invention;

[0031] Figure 6 yes Figure 5 A schematic diagram of the middle chair seat after removing the first and second light shields;

[0032] Figure label:

[0033] 100. Seat; 201. Infrared transmitter; 202. Infrared receiver module; 203. First light shield; 204. Second light shield; 1. Backrest; 2. Mounting bracket; 3. Lumbar support. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] Example 1:

[0040] like Figure 1 As shown, this invention discloses a method for detecting and reminding users of prolonged sitting in a chair. The chair's controller includes a timer, and the chair seat 100 is equipped with a sensor for detecting whether a person is sitting. The sensor is connected to the controller. The method includes the following steps:

[0041] S1. The controller receives the detection signal sent by the sensor and determines whether someone has sat down based on the detection signal;

[0042] S2. If yes, the controller controls the lumbar support ejection mechanism to eject the lumbar support 3 forward and proceeds to step S3; if no, the sedentary timer t returns to its initial value and returns to step S1.

[0043] S3. The controller controls the timer to start the sedentary timer t. When the sedentary timer t reaches the set time threshold T0, proceed to step S4.

[0044] S4. The controller controls the lumbar support extension mechanism to drive the lumbar support 3 to perform a prolonged sitting reminder action, the prolonged sitting timer t becomes the initial value, and returns to step S3.

[0045] This invention uses a timer connected to a controller. When the controller detects that someone has sat down, it starts a prolonged sitting timer t, activating the prolonged sitting reminder function. When the prolonged sitting timer t reaches a set time threshold T0, the controller controls the lumbar support extension mechanism to drive the lumbar support to perform a prolonged sitting reminder action. By changing the movement of the lumbar support, the user is reminded of prolonged sitting. The reminder method is simple and effective, and can be quickly and cost-effectively replicated on different seats.

[0046] Of course, in another implementation, after the controller determines in step S2 that no one has sat down, a step can be added to determine whether the sedentary timer t is the initial value. If the sedentary timer t is not the initial value, then the sedentary timer t becomes the initial value and returns to step S1; if the sedentary timer t is the initial value, then directly return to step S1.

[0047] The timer can employ one or both of the following functions: a forward countdown function and a countdown function. In one embodiment, when the timer uses the forward countdown function, the time threshold T0 is set to a manually predetermined value greater than 0. In step S3, the sedentary timer t increments from 0 until it reaches the set time threshold T0, at which point the process proceeds to step S4. When the timer uses the countdown function, the time threshold T0 is set to 0. In step S3, the sedentary timer t decrements from the set time threshold T0 until it becomes 0, at which point the process proceeds to step S4.

[0048] In one implementation, the manufacturer pre-sets whether the timer uses a countdown or forward countdown function and sets the time threshold T0 value at the factory. In another implementation, the chair is equipped with a communication module such as Wi-Fi and / or Bluetooth that can connect to mobile devices such as smartphones. The communication module is connected to the controller, so that the user can adjust whether the timer uses a countdown or forward countdown function via a mobile device such as a smartphone according to the actual situation, and can also adjust the time threshold T0 when using the forward countdown function.

[0049] In S4 of this invention, the change in the movement of the lumbar support 3 serves as a reminder to users who have been sitting for a long time. For example, based on the motor speed of the lumbar support extension mechanism, it takes 15-20 seconds for the lumbar support extension mechanism to move from its initial position with zero displacement relative to the seat to its full extension relative to the seat. In the first embodiment, the prolonged sitting reminder action only involves a retraction action, i.e., the controller controls the lumbar support extension mechanism to drive the lumbar support 3 to retract, and the duration of the retraction action is T1. In the second embodiment, the prolonged sitting reminder action only involves an extension action, i.e., the controller controls the lumbar support extension mechanism to drive the lumbar support 3 to extend once, and the duration of the extension action is T3. Alternatively, the prolonged sitting reminder action includes at least two extension actions, wherein the duration of each extension action is T3, and the duration of each extension action T3 is 3-10 seconds. There is a pause between the first and second extension actions. In this way, the displacement distance of the lumbar support after the second extension action is greater than the displacement distance after the first extension action. This achieves the purpose of reminding users to sit for a long time, regardless of their different sitting postures or usage states. Furthermore, it can also remind the user to prepare for the extension of the lumbar support 3. In the third embodiment, the prolonged sitting reminder action includes an extension action and a retraction action, that is, the controller controls the lumbar support push-out mechanism to drive the lumbar support 3 to extend first and then retract, or retract first and then extend, wherein the duration of the retraction action is T1 and the duration of the extension action is T3. In the fourth embodiment, the prolonged sitting reminder action includes a retraction action, a stop action, and an extension action, that is, the controller controls the lumbar support push-out mechanism to drive the lumbar support 3 to extend, stop, and retract in sequence, or the controller controls the lumbar support push-out mechanism to drive the lumbar support 3 to retract, stop, and extend in sequence, wherein the duration of the retraction action is T1, the duration of the stop action is T2, and the duration of the extension action is T3. Compared with the third embodiment, the addition of the stop action T2 can play a buffering role. If the retraction action and extension action of the lumbar support 3 are too closely connected, the user will be impacted by the inertia of the retraction action at the beginning of the extension action, which will reduce the comfort of use.

[0050] Generally, the duration of the retraction movement (T1) and the duration of the extension movement (T3) are 3 to 10 seconds, respectively, while the duration of the stopping movement (T2) is usually shorter, not exceeding 5 seconds. For example, in the case of a lumbar support 3, the retraction movement lasts for 3 seconds, the stopping movement lasts for 1 second, and the extension movement lasts for 3 seconds. Of course, other combinations of the above-mentioned movement methods and durations are also possible.

[0051] In one embodiment, the manufacturer sets the sedentary reminder action and its duration based on the motor speed of the lumbar support extension mechanism at the factory. In another embodiment, the chair is equipped with a communication module such as Wi-Fi and / or Bluetooth that can connect to mobile devices such as smartphones. The communication module is connected to the controller, so that the user can adjust the sedentary reminder action and its duration through mobile devices such as smartphones according to the actual situation.

[0052] In this invention, the sensor can also be one of the following: an infrared sensor, a pressure sensor, a millimeter-wave radar sensor, a capacitive sensor, an inductive sensor, or an ultrasonic sensor. Since pressure sensors are easily affected by ambient temperature and humidity and are prone to aging with long-term use, and millimeter-wave radar sensors are expensive, this embodiment uses an infrared sensor as an example. The infrared sensor includes an infrared emitting diode 201 for emitting infrared signals and an infrared receiving module 202 for continuously receiving infrared signals. In S1, after acquiring the infrared signal emitted by the infrared emitting diode 201, the infrared receiving module 202 outputs a level transition to the controller.

[0053] However, conventional infrared sensors suffer from a high false alarm rate due to ambient light interference or imperfect signal processing logic. For example... Figure 3 As shown, in this invention, the infrared emitting tube 201 emits an infrared signal with a duty cycle of 50%, a frequency of 10Hz, and a carrier frequency of 38kHz. The 38kHz carrier frequency effectively filters out ambient light interference. The infrared receiving module 202 converts the received infrared signal into an electrical signal and outputs it to the controller. The controller's I / O port is used to monitor the level changes of the output of the infrared receiving module 202. If the controller receives 10-30 level transitions within 1 second, the controller determines that no one is sitting down; otherwise, the controller determines that someone is sitting down. Based on this logic of whether a person is sitting, the false judgment rate is reduced.

[0054] like Figures 4 to 6As shown, this embodiment discloses a chair employing the aforementioned sedentary detection and reminder control method, comprising: a seat 100, with an infrared emitting tube 201 and an infrared receiving module 202 disposed opposite to each other on both sides of the inner wall of the seat 100. The infrared receiving module 202 can convert the signal from the infrared emitting tube 201 into an electrical signal and output it to the controller. To improve detection accuracy, the infrared emitting tube 201 and the infrared receiving module 202 are installed as close as possible to the center of the seat 100. To reduce the influence of ambient light, a first light shield 203 surrounding the infrared emitting tube 201 and a second light shield 204 surrounding the infrared receiving module 202 are fixedly disposed on the seat 100, thereby ensuring that the signal emitted by the infrared emitting tube 201 can be received by the infrared receiving module 202 to the greatest extent. The first light shield 203 and the second light shield 204 are preferably made of insulating and anti-interference plastic material.

[0055] The chair also includes a mounting bracket 2, which is fixedly mounted on the seat 100; a lumbar support 3, which is mounted on the mounting bracket 2 in a way that allows it to slide back and forth via a lumbar support ejection mechanism; and a controller that is connected to the lumbar support ejection mechanism.

[0056] In this invention, the seat 100 is covered with a mesh, sponge, or other permeable material. The chair also includes a blocking member, which is movably disposed on the seat 100 and moves in position when the upper surface of the seat 100 is pressed to block or allow signal transmission between the infrared emitting tube 201 and the infrared receiving module 202. In the first embodiment, the blocking member is a covering member that covers the seat 100. The covering member can be a mesh, sponge, or other permeable material. When the user sits down, the covering member sinks down to block the signal. In the second embodiment, the blocking member can also be a component additionally provided on the covering member. The blocking member is located on the side of the seat 100 covering member closer to the sensor. When the user sits down, the covering member sinks down, thereby causing the blocking member to sink down to block the signal. In the third embodiment, the blocking member is a component additionally provided on the seat 100. The blocking member is installed on the side of the seat surface of the seat 100 closer to the sensor. When the user sits down, the covering member sinks down, thereby causing the seat surface of the seat 100 and the blocking member to sink down to block the signal.

[0057] When someone is sitting on the seat 100, the blocking component moves between the infrared emitting tube 201 and the infrared receiving module 202 to prevent signal transmission between them; when no one is sitting, the blocking component moves away from the infrared emitting tube 201 and the infrared receiving module 202, and the infrared receiving module 202 can receive the signal emitted by the infrared emitting tube 201.

[0058] The chair in this embodiment may or may not have a lumbar massage mechanism. When the chair has a lumbar massage mechanism, it is mounted on the lumbar support 3, and the controller is connected to the lumbar massage mechanism. In step S2, when the controller determines that no one is sitting down, the lumbar massage mechanism cannot be activated, thereby preventing the massage function from being turned on when no one is using it, and ensuring that the massage function can be activated promptly when the user needs a massage, thus coordinating well with the user's sitting position.

[0059] Alternatively, when the controller determines that no one is sitting down, a position sensor can be added to detect whether the lumbar support ejection mechanism or lumbar support 3 has been ejected. If the lumbar support ejection mechanism is confirmed to be ejected, the controller then controls the lumbar support ejection mechanism to retract and reset the lumbar support 3, and the controller sets the lumbar massage mechanism to be disabled, returning to step S1. If the lumbar support ejection mechanism is not ejected, the controller directly sets the lumbar massage mechanism to be disabled and returns to S1. The aforementioned position sensor is connected to the controller.

[0060] Example 2:

[0061] The difference between this embodiment and Embodiment 1 is that, in this embodiment, the chair is equipped with a lumbar massage mechanism. In step S2, after detecting that a person has sat down, the controller sets the lumbar massage mechanism to be activated. Figure 2 As shown, in step S4 of this embodiment, after the controller controls the lumbar support ejection mechanism to drive the lumbar support to perform a prolonged sitting reminder action, the controller controls the lumbar massage mechanism to perform a massage action. The duration of the massage action is T4, thereby massaging and relaxing the user's lumbar region and relieving lumbar fatigue after prolonged sitting.

[0062] The massage duration T4 is 1-15 minutes. Of course, it can be adjusted according to actual needs, not limited to 1-15 minutes. In one embodiment, the manufacturer sets the massage duration T4 based on the motor speed of the lumbar massage mechanism at the factory. In another embodiment, the chair is equipped with a communication module such as Wi-Fi and / or Bluetooth that can connect to mobile devices like smartphones. This communication module is connected to the controller, allowing the user to adjust whether to perform a massage and the duration T4 via a mobile device as needed.

[0063] In this invention, the specific structures of the chair backrest 1, mounting bracket 2, lumbar support 3, lumbar support extension mechanism and lumbar massage mechanism, as well as the connection methods between each structure, can be referred to the various embodiments disclosed in patent documents such as CN120570463A.

[0064] In this invention, the chair also includes a backrest, the specific structure of which can be referred to various embodiments disclosed in patent documents such as CN120570463A.

[0065] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this invention.

[0066] In the description of this specification, the terms "one embodiment," "some embodiments," "one implementation," "specific implementation," "other implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment, implementation, or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described above can also be combined in any suitable manner in one or more embodiments, implementations, or examples. The technical solutions described in this invention also include technical solutions formed by any one or more specific features, structures, materials, or characteristics described above, either individually or in combination.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A method for detecting and reminding users of prolonged sitting on a chair, characterized in that, The chair's controller includes a timer, and the chair seat (100) is equipped with a sensor for detecting whether a person is sitting down. The sensor is connected to the controller, and the method includes the following steps: S1. The controller receives the detection signal sent by the sensor and determines whether someone has sat down based on the detection signal; S2. If yes, the controller controls the lumbar support ejection mechanism to eject the lumbar support forward (3), and proceeds to step S3; if no, the sedentary timer t becomes the initial value, and returns to step S1. S3. The controller controls the timer to start the sedentary timer t. When the sedentary timer t reaches the set time threshold T0, proceed to step S4. S4. The controller controls the lumbar support ejection mechanism to drive the lumbar support (3) to perform a prolonged sitting reminder action. The prolonged sitting timer t becomes the initial value and returns to step S3.

2. The method for detecting and reminding users of prolonged sitting on a chair according to claim 1, characterized in that, In step S4, the sedentary reminder action includes a retraction action, a stop action, and an extension action; wherein the duration of the retraction action is T1, the duration of the stop action is T2, and the duration of the extension action is T3.

3. The method for detecting and reminding users of prolonged sitting in a chair according to claim 2, characterized in that, The duration of the retraction action, T1, and the duration of the extension action, T3, are 3s to 10s, respectively.

4. The method for detecting and reminding users of prolonged sitting on a chair according to claim 1, characterized in that, In step S4, the sedentary reminder action includes at least two extension actions, wherein the duration of each extension action is T3, and the duration T3 of each extension action is 3s to 10s.

5. The method for detecting and reminding users of prolonged sitting on a chair according to claim 1, characterized in that, The chair seat (100) is also equipped with a lumbar massage mechanism, which is installed on the lumbar support (3). The lumbar massage mechanism is connected to the controller. When the controller determines that no one is sitting down, the lumbar massage mechanism is set to not start.

6. The method for detecting and reminding users of prolonged sitting on a chair according to claim 5, characterized in that, In step S4, after the controller controls the lumbar support ejection mechanism to drive the lumbar support to perform a prolonged sitting reminder action, the controller controls the lumbar massage mechanism to perform a massage action. The duration of the massage action is T4, which is 1 min to 15 min.

7. The method for detecting and reminding users of prolonged sitting in a chair according to claim 1, characterized in that, The sensor includes an infrared emitting tube (201) and an infrared receiving module (202). The infrared emitting tube (201) emits infrared signals, and the infrared receiving module (202) receives the infrared signals emitted by the infrared emitting tube (201) and then outputs a level transition to the controller.

8. The method for detecting and reminding users of prolonged sitting in a chair according to claim 7, characterized in that, If the controller receives 10 to 30 level transitions within 1 second, the controller determines that no one is sitting down; otherwise, the controller determines that someone is sitting down.

9. A chair employing the sedentary detection and reminder control method as described in any one of claims 1-8, characterized in that, include: The seat (100) has a sensor transmitter and a sensor receiver on opposite sides of the inner wall of the seat (100). The sensor receiver can convert the signal emitted by the sensor transmitter into an electrical signal and output it to the controller. Mounting bracket (2) is fixedly installed on the seat (100); The lumbar support (3) is mounted on the mounting bracket (2) in a sliding manner via the lumbar support ejection mechanism; The controller is connected to the lumbar support ejection mechanism.

10. A chair according to claim 9, characterized in that, The chair seat (100) is fixedly provided with a first light shield (203) surrounding the infrared emitting tube (201) and a second light shield (204) surrounding the infrared receiving module (202); and / or, a blocking member is movably provided on the chair seat (100), which moves its position after being pressed on the upper surface of the chair seat (100) to block or connect the signal transmission between the infrared emitting tube (201) and the infrared receiving module (202).

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