Indoor air conditioning device

Abstract

This technology improves user comfort by adjusting the concentration of air components. [Solution] The component adjustment unit 120 adjusts the oxygen concentration and carbon dioxide concentration as air component concentrations in the room 10. The body movement sensor 102 and heart rate sensor 104 detect the biometric information of the user 20 present in the room 10. The estimation unit 110 estimates the state of the user 20 based on the biometric information detected by the body movement sensor 102 and heart rate sensor 104. The component adjustment unit 120 adjusts the air component concentrations in the room 10 according to the state of the user 20 estimated by the estimation unit 110.

Description

Technical Field

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[0001] The present disclosure is an indoor air quality adjustment device that adjusts the concentration of indoor air components.

Background Art

[0002] To obtain good-quality sleep, a ventilation system raises the concentration of carbon dioxide to a predetermined concentration or higher from the time of going to bed until falling asleep, and lowers the concentration during sleep (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0007] Another aspect of this disclosure is an indoor air quality control device. This device comprises a component adjustment unit that adjusts the oxygen concentration in a room, a biometric information detection unit that detects the biometric information of a user present in the room, and an estimation unit that estimates the user's sleep stage based on the biometric information detected by the biometric information detection unit. The sleep stages include a sleep induction stage from going to bed until feeling sleepy, a sleep induction stage after feeling sleepy until consciousness fades and falling asleep, a sleep stage in which the body and brain are at rest, including REM sleep and non-REM sleep, and an awakened stage in which the person is awake and fully conscious. The component adjustment unit adjusts the oxygen concentration in the room according to the sleep stage estimated by the estimation unit, and if the estimation unit estimates that the user is in the sleep induction stage, the component adjustment unit lowers the oxygen concentration in the room to a level lower than the normal atmospheric oxygen concentration.

[0008] Another aspect of this disclosure is an indoor air quality control device. This device comprises a component adjustment unit that adjusts the carbon dioxide concentration in a room, a biometric information detection unit that detects the biometric information of a user present in the room, and an estimation unit that estimates the user's sleep stage based on the biometric information detected by the biometric information detection unit. The sleep stages include a sleep induction stage from going to bed until feeling sleepy, a sleep induction stage after feeling sleepy until consciousness fades and falling asleep, a sleep stage in which the body and brain are at rest, including REM sleep and non-REM sleep, and an awakened stage in which the person is awake and fully conscious. The component adjustment unit adjusts the carbon dioxide concentration in the room according to the sleep stage estimated by the estimation unit. If the estimation unit estimates the room to be in the sleep induction stage, the component adjustment unit raises the carbon dioxide concentration in the room to a level higher than the normal atmospheric carbon dioxide concentration, and if the estimation unit estimates the room to be in the sleep induction stage, it returns the carbon dioxide concentration in the room to the normal atmospheric carbon dioxide concentration.

[0009] Furthermore, any combination of the above components, as well as any conversion of the expressions of this disclosure between methods, apparatus, systems, recording media, computer programs, etc., are also valid forms of this disclosure. [Effects of the Invention]

[0010] According to this disclosure, user comfort can be improved by adjusting the concentration of air components. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows the configuration of an indoor space adjustment device according to an embodiment. [Figure 2] This figure shows the sleep stages of the user in Figure 1. [Figure 3] Figures 3(a) and 3(b) show the biometric information detected by the body movement sensor and heart rate sensor shown in Figure 1. [Figure 4] This figure shows the oxygen and carbon dioxide concentrations adjusted by the component adjustment unit in Figure 1. [Figure 5] Figure 1 is a flowchart showing the control procedure by the indoor space adjustment device. [Figure 6] This diagram shows the configuration of the indoor space adjustment device according to Modification 1. [Figure 7] This figure shows the oxygen and nitrogen concentrations adjusted by the component adjustment unit of Modification Example 1. [Figure 8] This figure shows the carbon dioxide concentration adjusted by the component adjustment unit of Modification Example 2. [Modes for carrying out the invention]

[0012] Before specifically describing the embodiments of this disclosure, an overview of the embodiments will be provided. This embodiment relates to an indoor space adjustment device that provides users with rapid induction of drowsiness and guidance to deep sleep by adjusting the concentration of air components in the space where the user sleeps (hereinafter referred to as "indoors"). The indoor space adjustment device acquires the user's biological information and, based on this information, estimates which of the following stages the user is in: the sleep induction stage from going to bed until feeling drowsy, the sleep induction stage after drowsiness until consciousness fades and falling asleep, the sleep stage in which the body and brain are at rest, including REM sleep and non-REM sleep, and the wakefulness stage when the user is awake and fully conscious. The indoor space adjustment device adjusts the concentration of air components according to the sleep induction stage, sleep induction stage, sleep stage, and wakefulness stage.

[0013] The embodiments described below all represent preferred specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement and connection configurations of components, as well as the steps (processes) and their order shown in the following embodiments are examples and are not intended to limit the present disclosure. Accordingly, among the components in the following embodiments, those components that are not described in the independent claims representing the highest-level concepts of the present disclosure will be described as optional components. In addition, substantially identical components are denoted by the same reference numerals in each figure, and redundant explanations are omitted or simplified.

[0014] Figure 1 shows the configuration of the indoor space adjustment device 200. The indoor space adjustment device 200 is a device for supplying oxygen and carbon dioxide to the room 10 where the user sleeps. The indoor space adjustment device 200 includes an estimation unit 110 and a component adjustment unit 120. The component adjustment unit 120 also includes an oxygen concentration adjustment unit 122 and a carbon dioxide concentration adjustment unit 124.

[0015] The room 10 includes an entrance / exit 12, and the room 10 is equipped with an imaging device 100, a body movement sensor 102, a heart rate sensor 104, an oxygen sensor 132, a carbon dioxide sensor 134, an oxygen outlet 142, a carbon dioxide outlet 144, and a ventilation device 150.

[0016] The interior space 10 is the internal space of a room partitioned by a top, bottom, and multiple sides. An openable and closable doorway 12 is provided on one side of the room, and by opening the doorway 12, the user 20 can enter the interior space 10 from the outside or exit the interior space 10 from the outside. The user 20 closes the doorway 12 when staying inside the interior space 10. When sleeping, the user 20 lies down with their head 22 facing the side opposite to the side where the doorway 12 is located.

[0017] The imaging device 100 images the user 20 within the room 10. The imaging device 100 is connected to the estimation unit 110 and outputs the captured video to the estimation unit 110. The body movement sensor 102 is installed under the mattress or futon on which the user 20 sleeps, and is a sensor that detects whether the user 20 is lying horizontally on the mattress or futon, or the body movement of the user 20 lying horizontally on the mattress or futon. The body movement of the user 20 includes turning over and breathing. The body movement sensor 102 is connected to the estimation unit 110 and outputs the detected body movement information to the estimation unit 110.

[0018] The heart rate sensor 104 is a sensor for detecting the heart rate of the user 20 and may be worn by the user 20. The heart rate sensor 104 is connected to the estimation unit 110 and outputs the detected heart rate information to the estimation unit 110. Since body movement and heart rate are biometric information of the user 20, the body movement sensor 102 and the heart rate sensor 104 can also be said to be biometric information detection units that detect the biometric information of the user 20 present in the room.

[0019] The estimation unit 110 can receive the video from the imaging device 100, can receive the body movement information from the body movement sensor 102, and can receive the heart rate information from the heart rate sensor 104. That is, the estimation unit 110 receives the biometric information detected by the biometric information detection unit. In the following description, the video is omitted. The estimation unit 110 estimates the state of the user 20, for example, the sleep stage of the user 20, based on the body movement information and the heart rate information.

[0020] Figure 2 shows the sleep stage of the user 20. Time elapses from left to right in Figure 2. As time passes, the user 20 goes to bed, feels sleepy, and then falls asleep. Also, the user 20 may wake up halfway after falling asleep. Furthermore, the user 20 wakes up and then gets up. Here, the period until going to bed is the activity period, the period from going to bed to getting up is the sleep period, and the period after getting up is the activity period. The sleep period is classified into a sleep induction stage 300 from going to bed until feeling sleepy, a sleep guidance stage 302 after feeling sleepy until consciousness fades and falls asleep, a sleep stage 304 in which the body and brain rest including REM sleep and non-REM sleep, and an awakening stage 306 in which the eyes open and consciousness is clear.

[0021] Figures 3(a) and 3(b) show biometric information detected by the body movement sensor 102 and the heart rate sensor 104. The horizontal axis of these figures shows the passage of time, similar to Figure 2. Figure 3(a) shows the temporal changes in body movement information, and Figure 3(b) shows the temporal changes in heart rate information. The body movement information and heart rate information fluctuate according to the sleep induction stage 300, sleep induction stage 302, sleep stage 304, and wakefulness stage 306. In other words, it can be said that classification into sleep induction stage 300, sleep induction stage 302, sleep stage 304, and wakefulness stage 306 is possible based on the body movement information and heart rate information. Return to Figure 1.

[0022] When user 20 goes to bed, they put on the body movement sensor 102 and lie down on the mattress on the heart rate sensor 104. Due to this action by user 20, when user 20 goes to bed, the body movement sensor 102 and heart rate sensor 104 begin detection. The body movement sensor 102 begins outputting body movement information, and the heart rate sensor 104 begins outputting heart rate information. When the estimation unit 110 begins receiving body movement information and heart rate information, it estimates that user 20 has entered sleep induction stage 300. The estimation unit 110 sequentially calculates the difference in heart rate over a predetermined period as heart rate variability.

[0023] During sleep induction phase 300, body movement and heart rate variability generally decrease over time. The estimation unit 110 estimates that the system has transitioned from sleep induction phase 300 to sleep induction phase 302 when body movement falls below threshold a and heart rate variability falls below threshold A. Thresholds a and A are predetermined through experiments or other means.

[0024] Even in sleep induction stage 302, body movement information, including body movement and heart rate variability, generally decreases over time. The estimation unit 110 estimates that the body has transitioned from sleep induction stage 302 to sleep stage 304 when body movement becomes smaller than threshold b and heart rate variability becomes smaller than threshold B. Thresholds b and B are predetermined through experiments or other means. Threshold b is a smaller value than threshold a, and threshold B is a smaller value than threshold A.

[0025] In sleep stage 304, body movement becomes smaller than threshold b, and heart rate variability remains smaller than threshold B. The estimation unit 110 estimates that the body has transitioned from sleep stage 304 to wakefulness stage 306 when body movement becomes larger than threshold b and heart rate variability becomes larger than threshold B in sleep stage 304.

[0026] The estimation unit 110 estimates that the user has returned to sleep stage 304 from wakefulness stage 306 when body movement becomes smaller than threshold b and heart rate variability becomes smaller than threshold B during wakefulness stage 306. At this point, wakefulness stage 306 corresponds to waking up in the middle of the night. Meanwhile, when the user 20 gets up, they remove the body movement sensor 102 and move away from the mattress on the heart rate sensor 104. Due to these actions by the user 20, when the user 20 gets up, the body movement sensor 102 and heart rate sensor 104 cease detection. The body movement sensor 102 ceases outputting body movement information, and the heart rate sensor 104 ceases outputting heart rate information. When the estimation unit 110 has finished receiving body movement information and heart rate information, it estimates that the user 20 has become active. The estimation unit 110 outputs the estimation result to the component adjustment unit 120. The estimation result indicates one of the following: sleep induction stage 300, sleep induction stage 302, sleep stage 304, or wakefulness stage 306. Furthermore, the estimation results may be output periodically, or they may be output when the stage changes.

[0027] The component adjustment unit 120 includes an oxygen concentration adjustment unit 122 and a carbon dioxide concentration adjustment unit 124. An oxygen sensor 132 is connected to the oxygen concentration adjustment unit 122, and a carbon dioxide sensor 134 is connected to the carbon dioxide concentration adjustment unit 124. The oxygen sensor 132 and the carbon dioxide sensor 134 are installed, for example, on the side of the room 10. The oxygen sensor 132 detects the oxygen concentration as an air component concentration in the room 10. Known techniques are used to detect the oxygen concentration. The oxygen sensor 132 outputs the detected oxygen concentration to the oxygen concentration adjustment unit 122. The carbon dioxide sensor 134 detects the carbon dioxide concentration as an air component concentration in the room 10. Known techniques are used to detect the carbon dioxide concentration. The carbon dioxide sensor 134 outputs the detected carbon dioxide concentration to the carbon dioxide concentration adjustment unit 124.

[0028] The oxygen concentration adjustment unit 122 receives estimation results from the estimation unit 110 and oxygen concentration from the oxygen sensor 132. The oxygen concentration adjustment unit 122 adjusts the oxygen concentration in the room 10 based on the oxygen concentration received from the oxygen sensor 132, according to the state of the user 20 estimated by the estimation unit 110, i.e., the stage of sleep. The adjustment of oxygen concentration will be described later. The oxygen concentration adjustment unit 122 is connected to the oxygen outlet 142 via a duct and blows out an amount of oxygen corresponding to the adjusted oxygen concentration from the oxygen outlet 142. Since the oxygen outlet 142 is installed, for example, on the ceiling of the room 10, oxygen is blown into the room 10 from the oxygen outlet 142.

[0029] The carbon dioxide concentration adjustment unit 124 receives the estimation result from the estimation unit 110 and the carbon dioxide concentration from the carbon dioxide sensor 134. The carbon dioxide concentration adjustment unit 124 adjusts the carbon dioxide concentration in the room 10 based on the carbon dioxide concentration received from the carbon dioxide sensor 134, according to the state of the user 20 estimated by the estimation unit 110, i.e., the stage of sleep. The adjustment of the carbon dioxide concentration will be described later. The carbon dioxide concentration adjustment unit 124 is connected to the carbon dioxide outlet 144 via a duct and blows out an amount of carbon dioxide corresponding to the adjusted carbon dioxide concentration from the carbon dioxide outlet 144. Since the carbon dioxide outlet 144 is installed, for example, on the ceiling of the room 10, carbon dioxide is blown into the room 10 from the carbon dioxide outlet 144.

[0030] Figure 4 is also used here to explain the operation of the oxygen concentration adjustment unit 122 and the carbon dioxide concentration adjustment unit 124. Figure 4 shows the oxygen concentration 322 and carbon dioxide concentration 324 adjusted by the component adjustment unit 120. The horizontal axis shows the passage of time, and the state of the user 20 transitions in the same order as in Figure 2: sleep induction stage 300, sleep induction stage 302, sleep stage 304, wakefulness stage 306, sleep stage 304, and wakefulness stage 306. The vertical axis shows the values ​​of oxygen concentration 322 and carbon dioxide concentration 324. In the center of the vertical axis, the values ​​of normal atmospheric oxygen concentration (approximately 21%), which is the oxygen concentration 322 in the atmosphere, and normal atmospheric carbon dioxide concentration (approximately 410 ppm), which is the carbon dioxide concentration 324 in the atmosphere, are shown as "atmospheric values".

[0031] During the sleep induction phase 300, the carbon dioxide concentration adjustment unit 124 releases carbon dioxide from the carbon dioxide outlet 144 to raise the carbon dioxide concentration 324 in the room 10 to a level higher than that of normal atmospheric carbon dioxide. On the other hand, the oxygen concentration adjustment unit 122 does not release oxygen from the oxygen outlet 142. Therefore, the oxygen concentration 322 in the room 10 during the sleep induction phase 300 is lower than that of normal atmospheric oxygen. This lowering of the oxygen concentration 322 in the room 10 to a level lower than that of normal atmospheric oxygen induces rapid sleepiness in the user 20.

[0032] In the sleep induction stage 302, the carbon dioxide concentration adjustment unit 124 stops blowing carbon dioxide from the carbon dioxide outlet 144 in order to return the carbon dioxide concentration 324 in the room 10 to the normal atmospheric carbon dioxide concentration. The carbon dioxide concentration adjustment unit 124 may also operate the ventilation device 150. In the sleep stage 304 and wakefulness stage 306 that follow the sleep induction stage 302, the carbon dioxide concentration adjustment unit 124 does not blow carbon dioxide from the carbon dioxide outlet 144. On the other hand, the oxygen concentration adjustment unit 122 blows oxygen from the oxygen outlet 142 in order to raise the oxygen concentration 322 in the room 10 to a level higher than the normal atmospheric oxygen concentration (first value). Furthermore, by raising the oxygen concentration 322 in the room 10 to a level higher than the normal atmospheric oxygen concentration when drowsiness is induced, a relaxing effect is given to the user 20, and deep sleep is induced.

[0033] In sleep stage 304, the oxygen concentration adjustment unit 122 blows oxygen from the oxygen outlet 142 to raise the oxygen concentration 322 in the room 10 to a higher level than the normal atmospheric oxygen concentration, and to lower the oxygen concentration 322 in the room 10 to a lower level (second value) than the oxygen concentration 322 in sleep induction stage 302. The oxygen concentration adjustment unit 122 may also operate the ventilation device 150. In wakefulness stage 306, the oxygen concentration adjustment unit 122 blows oxygen from the oxygen outlet 142 to raise the oxygen concentration 322 in the room 10 to a higher level than the oxygen concentration 322 in sleep stage 304. The oxygen concentration 322 in wakefulness stage 306 may be the same as the oxygen concentration 322 in sleep induction stage 302.

[0034] The subject of the apparatus, system, or method in this disclosure comprises a computer. The functions of the subject of the apparatus, system, or method in this disclosure are realized by the computer executing a program. The computer comprises a processor as its main hardware component, which operates according to the program. The processor is of any type as long as it can realize its functions by executing the program. The processor consists of one or more electronic circuits, including semiconductor integrated circuits (ICs) or LSIs (Large Scale Integrations). Multiple electronic circuits may be integrated on one chip or provided on multiple chips. Multiple chips may be aggregated in one device or provided on multiple devices. The program is recorded on a non-temporary recording medium such as a ROM, optical disc, or hard disk drive that is readable by the computer. The program may be pre-stored on the recording medium or supplied to the recording medium via a wide-area communication network, including the Internet.

[0035] The operation of the indoor space adjustment device 200 with the above configuration will now be explained. Figure 5 is a flowchart of the control procedure by the indoor space adjustment device 200. When the estimation unit 110 receives signals from the body movement sensor 102 and the heart rate sensor 104 (Y in S10), the component adjustment unit 120 lowers the oxygen concentration 322 below the atmospheric concentration (S12). If the body movement is not less than threshold a, or if the heart rate change is not less than threshold A (N in S14), it waits. If the body movement is less than threshold a and the heart rate change is less than threshold A (Y in S14), the component adjustment unit 120 sets the oxygen concentration 322 to the first value (S16). If the body movement is not less than threshold b, or if the heart rate change is not less than threshold B (N in S18), it waits. If body movement is less than threshold b and the rate of change of heart rate is less than threshold B (Y in S18), the component adjustment unit 120 sets the oxygen concentration of 322 to the second value (S20).

[0036] If the body movement is not greater than threshold b, or if the heart rate change is not greater than threshold B (N in S22), the process returns to step 20. If the body movement is greater than threshold b and the heart rate change is greater than threshold B (Y in S22), the component adjustment unit 120 sets the oxygen concentration 322 to the first value (S24). If the estimation unit 110 has received signals from the body movement sensor 102 and the heart rate sensor 104 (Y in S26), the process returns to step 22. If the estimation unit 110 has not received signals from the body movement sensor 102 and the heart rate sensor 104 (N in S10), or if the estimation unit 110 has not received signals from the body movement sensor 102 and the heart rate sensor 104 (N in S26), the process is terminated.

[0037] (Variation 1) Next, I will describe Modification 1. Modification 1 relates to the same indoor space control device 200 as before. The conventional indoor space control device 200 adjusts the oxygen concentration 322 and the carbon dioxide concentration 324. On the other hand, the indoor space control device 200 according to Modification 1 adjusts the oxygen concentration 322 and the nitrogen concentration.

[0038] Figure 6 shows the configuration of the indoor space adjustment device 200. Compared to Figure 1, the indoor space adjustment device 200 includes a nitrogen concentration adjustment unit 126, a nitrogen sensor 136, and a nitrogen outlet 146 instead of the carbon dioxide concentration adjustment unit 124, carbon dioxide sensor 134, and nitrogen sensor 136. The nitrogen sensor 136 is connected to the nitrogen concentration adjustment unit 126. The nitrogen sensor 136 is installed, for example, on the side of the room 10. The nitrogen sensor 136 detects the nitrogen concentration as the air component concentration of the room 10. Known techniques are used to detect the nitrogen concentration. The nitrogen sensor 136 outputs the detected nitrogen concentration to the nitrogen concentration adjustment unit 126.

[0039] The nitrogen concentration adjustment unit 126 receives the estimation result from the estimation unit 110 and the nitrogen concentration from the nitrogen sensor 136. The nitrogen concentration adjustment unit 126 adjusts the nitrogen concentration in the room 10 based on the nitrogen concentration received from the nitrogen sensor 136, according to the state of the user 20 estimated by the estimation unit 110, i.e., the stage of sleep. The nitrogen concentration adjustment unit 126 is connected to the nitrogen outlet 146 via a duct and blows out an amount of nitrogen corresponding to the adjusted nitrogen concentration from the nitrogen outlet 146. Since the nitrogen outlet 146 is installed, for example, on the ceiling of the room 10, nitrogen is blown into the room 10 from the nitrogen outlet 146.

[0040] Figure 7 shows the oxygen concentration 322 and nitrogen concentration 326 adjusted by the component adjustment unit 120. This is shown in the same way as in Figure 4. The nitrogen concentration 326 changes in the same way as the carbon dioxide concentration 324 in Figure 4. Therefore, the nitrogen concentration adjustment unit 126 changes the nitrogen concentration 326 in the room 10 by performing the same process as the carbon dioxide concentration adjustment unit 124. The oxygen concentration adjustment unit 122 performs the same process as in the example.

[0041] (Modification 2) Next, I will describe Modification 2. Modification 2 relates to the same indoor space control device 200 as before. The indoor space control device 200 according to Modification 2 adjusts only the carbon dioxide concentration of 324. The indoor space control device 200 according to Modification 2 has the same configuration as in Figure 1, but with the oxygen concentration adjustment unit 122, oxygen sensor 132, and oxygen outlet 142 removed.

[0042] Figure 8 shows the carbon dioxide concentration 324 adjusted by the component adjustment unit 120. This is shown in the same way as the carbon dioxide concentration 324 in Figure 4. In other words, the carbon dioxide concentration adjustment unit 124 in the modified example performs the same processing as in the example.

[0043] In the above process, the carbon dioxide concentration adjustment unit 124 increases the carbon dioxide concentration 324 in the room 10 to 3000 ppm or more when it is the sleep induction stage 300. Furthermore, when it is estimated that it is the sleep induction stage 302, sleep stage 304, or wakefulness stage 306, the carbon dioxide concentration adjustment unit 124 reduces the carbon dioxide concentration 324 in the room 10 to less than 1000 ppm.

[0044] According to this embodiment, the oxygen and carbon dioxide concentrations in the room 10 are adjusted according to the user 20's condition, thereby providing the user 20 with drowsiness induced by carbon dioxide and relaxation effects from oxygen. Furthermore, since the user 20 is provided with drowsiness induced by carbon dioxide and relaxation effects from oxygen, the user 20's comfort can be improved. In addition, drowsiness can be induced by making the air component concentrations in the room 10 high in carbon dioxide or low in oxygen, and after drowsiness is induced, the oxygen concentration can be increased to promote relaxation and improve sleep onset. Moreover, since the air component concentrations in the room 10 are increased to high oxygen concentration during sleep, breathing can be stabilized. Furthermore, because breathing is stabilized, awakenings during the night are reduced, and quality sleep can be obtained.

[0045] Furthermore, by lowering the oxygen concentration to below normal atmospheric oxygen concentration during sleep induction stage 300, drowsiness can be induced in the user 20. Also, by raising the oxygen concentration to below normal atmospheric oxygen concentration during sleep induction stage 302, sleep stage 304, and wakefulness stage 306, relaxation can be achieved in the user 20. In addition, by lowering the oxygen concentration to below normal atmospheric oxygen concentration during sleep induction stage 300 and raising the oxygen concentration to below normal atmospheric oxygen concentration during sleep induction stage 302, sleep stage 304, and wakefulness stage 306, drowsiness and relaxation can be provided to the user 20.

[0046] Furthermore, by increasing the oxygen concentration in the wakefulness stage 306 to a higher level than that in the sleep stage 304, the user 20 can be relaxed and returned to the sleep stage 304. Also, by increasing the carbon dioxide concentration in the sleep induction stage 300 to a higher level than that of normal atmospheric carbon dioxide, and returning the carbon dioxide concentration to that of normal atmospheric carbon dioxide in the sleep induction stage 302, drowsiness can be induced and relaxation can be provided to the user 20. In addition, by increasing the carbon dioxide concentration to 3000 ppm or higher in the sleep induction stage 300, and decreasing it to less than 1000 ppm in the sleep induction stage 302, sleep stage 304, and wakefulness stage 306, drowsiness can be induced and relaxation can be provided to the user 20.

[0047] An overview of one aspect of this disclosure is as follows: (Item 1) A component adjustment unit (120) adjusts the oxygen concentration and carbon dioxide concentration as components of the indoor air (10), A biometric information detection unit that detects the biometric information of a user (20) present in the room (10), The system includes an estimation unit (110) that estimates the state of the user (20) based on the biological information detected by the biological information detection unit, The component adjustment unit (120) is an indoor air quality control device (200) that adjusts the concentration of the air components in the room (10) according to the state of the user (20) estimated by the estimation unit (110).

[0048] (Item 2) The estimation unit (110) estimates the sleep stage of the user (20) as the state of the user (20), The component adjustment unit (120) adjusts the concentration of the air components in the room (10) according to the sleep stage estimated by the estimation unit (110), and is an indoor air quality control device (200) as described in item 1.

[0049] (Item 3) The aforementioned sleep stages are The sleep induction phase from going to bed until feeling sleepy, The sleep induction stage, from feeling drowsy to losing consciousness and falling asleep, Sleep stages in which the body and brain rest, including REM sleep and non-REM sleep, An indoor air quality control device (200) as described in item 2, including the awake stage in which the person is awake and fully aware.

[0050] (Item 4) The component adjustment unit (120) is an indoor air quality control device (200) according to item 3, which lowers the oxygen concentration in the room (10) to a normal atmospheric oxygen concentration when the estimation unit (110) estimates that the sleep induction stage has occurred.

[0051] (Item 5) The component adjustment unit (120) is an indoor air quality control device (200) according to item 3, which raises the oxygen concentration in the room (10) to a higher level than the normal atmospheric oxygen concentration when the estimation unit (110) estimates that the sleep induction stage, the sleep stage, or the wakefulness stage.

[0052] (Item 6) The indoor air quality control device (200) according to item 3, wherein the component adjustment unit (120) lowers the oxygen concentration in the room (10) to a normal atmospheric oxygen concentration when the estimation unit (110) estimates that it is the sleep induction stage, the sleep stage, or the wakefulness stage, and raises the oxygen concentration in the room (10) to a normal atmospheric oxygen concentration when the estimation unit (110) estimates that it is the sleep induction stage, the sleep stage, or the wakefulness stage.

[0053] (Item 7) The component adjustment unit (120) is an indoor air quality control device (200) according to item 5, which, when the estimation unit (110) estimates that the wakefulness stage is reached, raises the oxygen concentration in the room (10) to a level higher than the oxygen concentration during the sleep stage.

[0054] (Item 8) The component adjustment unit (120) raises the carbon dioxide concentration in the room (10) to a higher level than the normal atmospheric carbon dioxide concentration when the estimation unit (110) estimates that it is the sleep induction stage, and returns the carbon dioxide concentration in the room (10) to the normal atmospheric carbon dioxide concentration when the estimation unit (110) estimates that it is the sleep induction stage, as described in item 3, an indoor air quality control device (200).

[0055] (Item 9) The indoor air quality control device (200) described in item 8, wherein the component adjustment unit (120) increases the carbon dioxide concentration in the room (10) to 3000 ppm or more when the estimation unit (110) estimates the sleep induction stage, the sleep stage, or the wakefulness stage, and reduces the carbon dioxide concentration in the room (10) to less than 1000 ppm when the estimation unit (110) estimates the sleep induction stage, the sleep stage, or the wakefulness stage.

[0056] (Item 10) A component adjustment unit (120) that adjusts the oxygen concentration inside the room (10), A biometric information detection unit that detects the biometric information of a user (20) present in the room (10), The system includes an estimation unit (110) that estimates the sleep stage of the user (20) based on the biological information detected by the biological information detection unit, The aforementioned sleep stages are The sleep induction phase from going to bed until feeling sleepy, The sleep induction stage, from feeling drowsy to losing consciousness and falling asleep, Sleep stages in which the body and brain rest, including REM sleep and non-REM sleep, This includes the waking stage, in which one is fully awake and aware. The component adjustment unit (120) adjusts the oxygen concentration in the room (10) according to the sleep stage estimated by the estimation unit (110), The component adjustment unit (120) is an indoor air quality control device (200) that, when the estimation unit (110) estimates that the sleep induction stage has occurred, lowers the oxygen concentration in the room (10) to a level lower than the normal atmospheric oxygen concentration.

[0057] (Item 11) A component adjustment unit (120) that adjusts the carbon dioxide concentration inside (10), A biometric information detection unit that detects the biometric information of a user (20) present in the room (10), The system includes an estimation unit (110) that estimates the sleep stage of the user (20) based on the biological information detected by the biological information detection unit, The aforementioned sleep stages are The sleep induction phase from going to bed until feeling sleepy, The sleep induction stage, from feeling drowsy to losing consciousness and falling asleep, Sleep stages in which the body and brain rest, including REM sleep and non-REM sleep, This includes the waking stage, in which one is fully awake and aware. The component adjustment unit (120) adjusts the carbon dioxide concentration in the room (10) according to the sleep stage estimated by the estimation unit (110). The component adjustment unit (120) is an indoor air quality control device (200) that, when the estimation unit (110) estimates that it is the sleep induction stage, raises the carbon dioxide concentration in the room (10) to a level higher than the normal atmospheric carbon dioxide concentration, and when the estimation unit (110) estimates that it is the sleep induction stage, returns the carbon dioxide concentration in the room (10) to the normal atmospheric carbon dioxide concentration.

[0058] Although the present disclosure has been explained above based on the examples, it can be easily inferred that the present disclosure is not limited in any way to the above examples, and that various improvements and modifications are possible without departing from the spirit of the present disclosure. [Explanation of Symbols]

[0059] 10 Indoors, 12 Entrance / Exit, 20 User, 22 Head, 100 Imaging device, 102 Motion sensor, 104 Heart rate sensor, 110 Estimation unit, 120 Component adjustment unit, 122 Oxygen concentration adjustment unit, 124 Carbon dioxide concentration adjustment unit, 126 Nitrogen concentration adjustment unit, 132 Oxygen sensor, 134 Carbon dioxide sensor, 136 Nitrogen sensor, 142 Oxygen outlet, 144 Carbon dioxide outlet, 146 Nitrogen outlet, 150 Ventilation device, 200 Indoor space adjustment device.

Claims

1. A component adjustment unit that adjusts the oxygen concentration and carbon dioxide concentration as indoor air component concentrations, A biometric information detection unit that detects the biometric information of a user present in the room, The system includes an estimation unit that estimates the user's state based on the biological information detected by the biological information detection unit, The component adjustment unit is an indoor air quality control device that adjusts the concentration of the air components in the room according to the user's condition estimated by the estimation unit.

2. The estimation unit estimates the user's sleep stage as the user's state, The indoor air quality control device according to claim 1, wherein the component adjustment unit adjusts the concentration of the air components in the room according to the sleep stage estimated by the estimation unit.

3. The aforementioned sleep stages are The sleep induction phase from going to bed until feeling sleepy, The sleep induction stage, from feeling drowsy to losing consciousness and falling asleep, Sleep stages in which the body and brain rest, including REM sleep and non-REM sleep, The indoor air quality control device according to claim 2, which includes an awakened stage in which the person is awake and fully aware.

4. The indoor air quality control device according to claim 3, wherein the component adjustment unit lowers the oxygen concentration in the room to a normal atmospheric oxygen concentration when the estimation unit estimates that the sleep induction stage has occurred.

5. The indoor air quality control device according to claim 3, wherein the component adjustment unit raises the oxygen concentration in the room to a higher level than the normal atmospheric oxygen concentration when the estimation unit estimates that the sleep induction stage, the sleep stage, or the wakefulness stage.

6. The indoor air quality control device according to claim 3, wherein the component adjustment unit lowers the oxygen concentration in the room to a level lower than the normal atmospheric oxygen concentration when the estimation unit estimates that it is the sleep induction stage, the sleep stage, or the wakefulness stage.

7. The indoor air quality control device according to claim 5, wherein the component adjustment unit, when the estimation unit estimates that the wakefulness stage is present, raises the oxygen concentration in the room to a level higher than the oxygen concentration during the sleep stage.

8. The indoor air quality control device according to claim 3, wherein the component adjustment unit raises the indoor carbon dioxide concentration to a higher level than the normal atmospheric carbon dioxide concentration when the estimation unit estimates that it is in the sleep induction stage, and returns the indoor carbon dioxide concentration to the normal atmospheric carbon dioxide concentration when the estimation unit estimates that it is in the sleep induction stage.

9. The indoor air quality control device according to claim 8, wherein the component adjustment unit increases the indoor carbon dioxide concentration to 3000 ppm or more when the estimation unit estimates the sleep induction stage, the sleep stage, or the wakefulness stage, and reduces the indoor carbon dioxide concentration to less than 1000 ppm when the estimation unit estimates the sleep induction stage, the sleep stage, or the wakefulness stage.

10. A component adjustment unit that adjusts the oxygen concentration in the room, A biometric information detection unit that detects the biometric information of a user present in the room, The system includes an estimation unit that estimates the user's sleep stage based on the biological information detected by the biological information detection unit, The aforementioned sleep stages are The sleep induction phase from going to bed until feeling sleepy, The sleep induction stage, from feeling drowsy to losing consciousness and falling asleep, Sleep stages in which the body and brain rest, including REM sleep and non-REM sleep, This includes the waking stage, in which one is fully awake and aware. The component adjustment unit adjusts the oxygen concentration in the room according to the sleep stage estimated by the estimation unit. The component adjustment unit is an indoor air quality control device that, when the estimation unit estimates that the sleep induction stage has occurred, lowers the oxygen concentration in the room to a level lower than the normal atmospheric oxygen concentration.

11. A component adjustment unit that adjusts the carbon dioxide concentration indoors, A biometric information detection unit that detects the biometric information of a user present in the room, The system includes an estimation unit that estimates the user's sleep stage based on the biological information detected by the biological information detection unit, The aforementioned sleep stages are The sleep induction phase from going to bed until feeling sleepy, The sleep induction stage, from feeling drowsy to losing consciousness and falling asleep, Sleep stages in which the body and brain rest, including REM sleep and non-REM sleep, This includes the waking stage, in which one is fully awake and aware. The component adjustment unit adjusts the carbon dioxide concentration in the room according to the sleep stage estimated by the estimation unit. The component adjustment unit is an indoor air quality control device that, when the estimation unit estimates that it is in the sleep induction stage, raises the indoor carbon dioxide concentration to a level higher than the normal atmospheric carbon dioxide concentration, and when the estimation unit estimates that it is in the sleep induction stage, returns the indoor carbon dioxide concentration to the normal atmospheric carbon dioxide concentration.

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