JP4678309B2 - Bed detection device - Google Patents

Description

  The present invention relates to an in-bed detection device that detects the presence or absence of a living body on a bedding.

  Conventionally, as this kind of bed detection device, a device that determines whether a human body on the bedding has fallen asleep by detecting body movement using a piezoelectric element fixed on the surface of the bedding has been proposed. (For example, refer to Patent Document 1).

  In the technique described in Patent Document 1, a specific frequency component is extracted and smoothed from the output of the piezoelectric element, and fine body movements that are minute body movements caused by heart activity and respiratory activity, and entering, waking up, and turning over. In order to distinguish the coarse body motion that is a large body motion as described above, the signal level after smoothing is compared with the first set value and the second set value. The first set value is set to determine the presence or absence of a human body on the bedding. When the signal level is less than the first set value, it is determined that the user is absent. Further, the second set value is set larger than the first set value in order to distinguish between the fine body motion and the rough body motion, and the signal level is equal to or higher than the first set value and less than the second set value. Is determined to be a resting state, and if the signal level is equal to or higher than the second set value, it is determined that a rough body motion has occurred.

Further, when the signal level is equal to or higher than the second set value, the duration time is measured to distinguish whether the movement is caused by the human body itself on the bedding or the other noise. Patent Document 1 also describes a technique for determining sleep onset by detecting a human brain wave, eye movement, or pulse wave as a conventional technique.
JP-A-5-15517

  By the way, since the invention described in Patent Document 1 detects the fine body movement and the rough body movement using the output of the piezoelectric element, the floor when walking around the bedding or when opening and closing the door. This vibration is also detected by the piezoelectric element. Since the first set value is set so as to detect thin body movement, the signal level when walking around the bedding or when the vibration that opens and closes the door is detected by the piezoelectric element is There is a high possibility of exceeding the set value, and there is a risk of erroneous determination as a state in which a human body is present on the bedding (hereinafter referred to as “bed-in”). That is, there is a possibility that the presence of the person in the bed is erroneously detected when the signal level of the signal obtained from the output of the piezoelectric element exceeds the first set value even though no human body is present on the bedding.

  That is, in the technique described in Patent Document 1, when the signal level obtained from the piezoelectric element exceeds the second set value, the actions of other people and electrical noise are distinguished from the body movement of the user on the bedding. However, when the signal level is between the first setting value and the second setting value, it is always determined that the person is in the floor, and the surrounding area of the bedding is determined even though there is no human body on the bedding. There is a possibility that a signal when walking or opening / closing a door is erroneously determined as being in bed.

  Moreover, it is known that piezoelectric elements are easily affected by electrical noise such as noise generated when the power is turned on and off, and the types of electrical noise differ depending on the installation environment. In the technique described in (1), it is difficult to sufficiently suppress the influence of noise, and this also increases the possibility of being erroneously determined to be present when the user is absent on the bedding.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide an in-bed detection device that reduces the possibility of being erroneously determined to be in bed when the user is absent from the bedding.

According to the first aspect of the present invention, a living body is present on the bedding from the vibration sensor for detecting the vibration of the bedding, the living body sensor for detecting the presence or absence of the living body on the bedding, the output signal of the vibration sensor and the output of the living body sensor. A presence determination unit that determines whether there is no living body on the floor and the bedding, and the presence determination unit moves the living body on the bedding when the amplitude of the output signal of the vibration sensor exceeds a prescribed body motion threshold. If the biological sensor detects a living body when the amplitude of the output signal of the vibration sensor is equal to or less than the body movement threshold and the amplitude of the output signal of the vibration sensor is the body movement threshold less was to determine the biological is not detected by the biometric sensor and the absence state, further, the the bed the bed state is detected from a state of being determined missed state after it is determined that the body movement state Transition to the state, determine the absence state Wherein the state body movement state from that does not transition to the bed state is not detected.

  According to this configuration, instead of discriminating the body movement state, the in-bed state, and the absence state based only on the amplitude level of the vibration, information on the presence / absence of the living body detected by the biological sensor is also used for the determination of each state. Therefore, the possibility of erroneously detecting the presence of a living body due to other vibrations or electrical noise when the living body is absent on the bedding is reduced. In addition, since the transition from the absent state to the floor state is performed only through the body motion state, the vibration sensor output signal satisfies the transition condition from the absence state to the body motion state. If the output does not satisfy the transition condition from the body movement state to the bed state, the transition from the absence state to the bed state will not occur, preventing the living body from being judged to be in the bed state without riding on the bedding. it can. In other words, if the vibration of the bedding when the living body rides on the bedding is not detected as a body movement state, it is possible to walk around the bedding and open / close the door without transitioning from the absence state to the floor state. It is possible to prevent erroneous determination of being in the floor due to vibration or electrical noise that occurs.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the vibration sensor is also used as the living body sensor to detect a heartbeat from the living body on the bedding.

  According to this configuration, since the vibration sensor that detects body movement is also used as a biological sensor that detects the presence or absence of a living body, the number of sensors is reduced compared to the case where the vibration sensor and the biological sensor are provided separately. In addition to simplifying the sensor, the sensor can be miniaturized.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, in the presence of a floor, the presence determination unit does not detect vibration by the vibration sensor and the presence of a living body by the output of the biological sensor. When the undetected state reaches the defined bed leaving detection time, the state transits to the absence state.

  According to this configuration, even if there is a transition to the occupancy state due to an erroneous determination, the occupancy state can be automatically restored to the absence state. The inconvenience of continuing can be prevented.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, a sleep environment is recorded using a history of transition of three states of a body movement state, a bed state, and an absence state detected by the bed detection unit. The load control apparatus which controls the load apparatus which forms is added, It is characterized by the above-mentioned.

  According to this configuration, since the sleep state can be estimated by using the transition history of the body movement state, the bed state, and the absence state, such as a lighting device or an AV device that forms a sleep environment. The load device can be controlled in accordance with the sleep state, and a comfortable sleep environment according to the sleep state of the living body on the bedding can be automatically formed.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a communication unit is added that causes the occupancy detection unit to notify the load control device of the three states via a data transmission path. It is characterized by.

  According to this configuration, since the occupancy detection unit and the load control device can be arranged in different places, the occupancy detection unit can be arranged in the vicinity of the bedding and the load control device can be arranged in the vicinity of the load. it can.

  According to the configuration of the present invention, the transition from the body movement state to the floor movement state and the absence state is permitted, but only the transition from the absence state to the body movement state is permitted. The transition from the unattended state to the stagnation state must pass through the body movement state, and if the vibration of the bedding when the living body gets on the bedding is not detected as the body movement state, the transition from the absence state to the stagnation state In addition, there is an advantage that it can be prevented from being erroneously determined to be in the floor due to vibration or electrical noise generated by walking around the bedding or opening / closing the door.

  In the following description, the term “living body” means an animal including a human body, and a similar configuration can be adopted even for a dog or a cat other than a human. In addition, a state where a living body is present on the bedding is referred to as “present bed”, and a state where no living body is present on the bedding is referred to as “absence”. Furthermore, the act of getting on the bedding is called “entry”, and the act of getting off the bedding is called “getting out of bed”. Moreover, the case of a human body is illustrated as a living body. Also in the embodiments described below, the state to be detected is the same as in the prior art, the state where the human body exists on the bedding (bed), the state where there is no human body on the bedding (absence), and the human body on the bedding There are three states when the person performs an action such as turning over (body movement). However, the body movement in the present invention includes getting on and off the bedding. It is also possible to include other states during the transition from the body motion state to the bed state or the absence state, or during the transition from the absence state to the body motion state.

(Embodiment 1)
This embodiment illustrates the bed 1 which consists of the bed main body 11 and the mattress 12 as bedding, as shown in FIG. A vibration sensor 2 described later is disposed between the bed body 11 and the mattress 12 under the mattress 12, and the above-described three states are determined based on the output of the vibration sensor 2. As the vibration sensor 2, a sensor that can detect a heartbeat in addition to body movement caused by a user lying on the bed 1 is used. That is, the output signal of the vibration sensor 2 includes presence / absence information corresponding to vibration caused by the user entering and exiting the bed 1 and biological information corresponding to the presence / absence of a living body such as a heartbeat.

  This type of vibration sensor 2 is not particularly limited as long as it can convert vibration into an electric signal and can detect a user's heartbeat. PVDF (polyvinylidene fluoride) is used as a piezoelectric material. Piezoelectric element used, electrostatic capacity type vibration sensor that converts vibration into change in electrostatic capacity, vibration sensor that has an air bag to which vibration is transmitted and detects fluctuations in air pressure in the air bag with a pressure detection element, vibration A microphone (vibration pickup) configured for detection can be used.

  The output signal of the vibration sensor 2 is input to the occupancy detection unit 21, and the occupancy detection unit 21 determines the three states of the occupancy state, the absence state, and the body movement state by a procedure described later. It is desirable to use a shield line for the connection line between the vibration sensor 21 and the floor detection unit 21 in order to suppress the influence of ambient noise. The occupancy detection unit 21 performs AD conversion of the output signal from the vibration sensor 2, and the condition determination described below is performed using a microcomputer. In this embodiment, the example which controls sleep environment using the discrimination | determination result of the occupancy detection part 21 is shown, and the load apparatus (The lighting fixture 31 and AV apparatus 32 in the example of illustration) for forming sleep environment is shown. The sleep environment control part 23 to control is provided.

  The determination result by the presence detection unit 21 is transferred to the sleep environment control unit 23 through the communication unit 22 that performs data transmission by serial communication, and the lighting device 31 and the AV device 32 are controlled using the determination result. The lighting fixture 31 includes a lighting control unit 24 between the lighting environment control unit 23, and the lighting control unit 24 outputs a lighting control signal corresponding to an instruction from the sleep environment control unit 23 to the lighting fixture 31. The AV device 32 includes an AV device control unit 25 between the AV device control unit 23 and the AV device control unit 25 outputs an AV control signal corresponding to an instruction from the sleep environment control unit 23 to the AV device 32. . The transmission path for data transmission between the communication unit 22 and the sleep environment control unit 23 may be either wired or wireless, but the in-bed detection unit 21 is disposed in the vicinity of the bed 1 to control the sleep environment. When the unit 23 is arranged in the vicinity of the load device, the use of a wireless transmission path using infrared rays or the like as a transmission medium increases the degree of freedom in arrangement.

  As the luminaire 31, one that can arbitrarily adjust the light output by being provided with an illumination control signal as well as turning on and off is used. The AV device 32 mainly uses an audio device, but there may be a case where a video presentation device including a video tape player or a DVD player and a display is used. Further, as the AV device 32, a device capable of switching the contents of sound and video and adjusting the volume of the sound device by using an AV control signal is used. Although not shown, this type of load device includes a tank storing a plurality of types of fragrance components, and by giving a fragrance signal, the fragrance components are mixed and vaporized in a specified amount, and various types of load devices are provided. In some cases, an aroma generator capable of generating an aroma is used.

  In addition, as a load device that forms a sleep environment, a massage device, an air conditioner device, an electric curtain, or the like can be provided.

  In the illustrated example, the presence determination device 20 including the presence detection unit 21 and the communication unit 22, and the load control device 30 including the sleep environment control unit 23, the lighting control unit 24, and the AV device control unit 25 are separated. However, the load control device 30 may be provided integrally with the occupancy determination device 20. In this case, the communication unit 22 is unnecessary, and the determination result of the bed detection unit 21 is directly given to the sleep environment control unit 23.

  Below, operation | movement of the occupancy detection part 21 is demonstrated. The occupancy detection unit 21 determines the three states of the occupancy state, the absence state, and the body movement state from the output signal of the vibration sensor 2. In order to explain the operation of the occupancy detection unit 21, first, the relationship between the user's actions when entering and leaving the floor and the amplitude of vibration detected by the vibration sensor 2 will be considered. The relationship between the two can be roughly considered as follows.

  When entering the floor, generally act in the following order. (1-1) Approaching the bed 1: Small amplitude, (1-2) Turning over the comforter: High amplitude, (1-3) Entering the floor (getting on the bed 1): Large amplitude, (1-4) On the bed 1 Lie down and lay a comforter: large amplitude, (1-5) resting: small amplitude. In addition, when getting out of bed, the general behavior is as follows. (2-1) Resting state: small amplitude, (2-2) flipping comforter: large amplitude, (2-3) moving on bed 1 while raising or lying down: large amplitude, (2-4) Getting out of bed (getting off bed 1): Small amplitude.

  From the above considerations, it can be seen that a state occurs in which the amplitude of vibration increases in the process of entering or leaving the floor. Since the floor is between the entrance and the leaving floor, if the transition to the floor state is detected after detecting the state of large vibration amplitude, the reliability of the determination of the floor state and the absence state can be improved. It can be said. That is, a state in which the amplitude of vibration detected by the vibration sensor 2 is large occurs at the time of transition from the absent state to the floored state (at the time of entering the floor). Reliability can be improved. Moreover, in the resting state of (1-5) and (2-1), which is the period from the user's entering to the leaving of the bed, detection of the user's biological information caused by heartbeat and breathing Therefore, if biological information is also detected when it can be regarded as being in a bed, the reliability in determining the bed is increased.

  Based on the above-described considerations, the presence detection unit 21 of the present embodiment determines three types of condition determination in detecting three states of the presence state, the absence state, and the body movement state based on the output signal of the vibration sensor 2. I do. That is, regarding the body movement state, the moving average value of the amplitude of the output signal of the vibration sensor 2 is compared with a prescribed body movement threshold. When the moving average value exceeds the body motion threshold value, it is determined that the body motion state is present, and when the moving average value is equal to or less than the body motion threshold value, it is determined that the subject is in the presence or absence state.

  When the moving average of the amplitude of the output signal of the vibration sensor 2 is equal to or less than the body motion threshold, it is determined based on the output signal of the vibration sensor 2 whether vibration due to the heartbeat of the user is detected. Since the output signal of the vibration sensor 2 of the present embodiment includes vibration due to a heartbeat, and the heartbeat frequency is 0.5 to 1.5 Hz, a component of this frequency is extracted from the output signal of the vibration sensor 2, When this frequency component is detected over a certain period of time (for example, 10 seconds), it is determined that vibration due to a heartbeat has been detected. That is, it can be said that there is a high possibility that the user exists on the bed 1.

  By the way, even in the state where the user is present on the bed 1, the amplitude of vibration may be increased in the same manner as before leaving the bed due to relatively large body movement such as turning over. Since this state is not a bed leaving state, it is necessary to maintain a bed state. However, since the amplitude of vibration is increased, there is a possibility of a bed leaving. Therefore, in the presence of the floor, the duration of the state in which no vibration is detected by the vibration sensor 2 and the heartbeat is not detected is counted, and if the next vibration is not detected within the defined bed leaving detection time, it is determined that the person is absent. By setting the bed detection time, if the heartbeat is detected within the bed detection time, the bed can be maintained, and even if it makes a transition to the bed due to an erroneous determination, it automatically returns to the absence state. Therefore, it is possible to prevent the occupancy state from continuing even though there is no user on the bed 1. The bed leaving detection time is measured by a timer (not shown) built in the bed presence detection unit 21.

  Three types of determinations, the determination of comparing the moving average value of the amplitude of the output signal of the vibration sensor 2 with the body movement threshold, the determination of the heartbeat vibration, and the determination of the bed leaving detection time, depend on the state determined by the occupancy detection unit 21. Used as appropriate. A procedure for using the above-described three types of determination for transition between states will be described below.

  Immediately after the power is turned on (immediately after the start of operation), the three states of being in the floor, absent, and body movement are not determined. Transition to. That is, as shown in FIG. 2 as a state transition diagram, it operates as an indefinite state ST0 (for example, invalidates the output of the vibration sensor 2) for a certain period (for example, 128 ms) immediately after the power is turned on, and then the output of the vibration sensor 2 Based on the signal, the state transits to any one of three states, that is, the presence state ST1, the absence state ST2, and the body movement state ST3.

  FIG. 3 shows the conditions for transition from the undefined state ST0 to the other states ST1 to ST3. In the indefinite state ST0, the determination based on the bed leaving detection time is not used, and the determination of the body motion threshold value and the heartbeat vibration is performed. That is, in the undefined state ST0, the moving average value of the amplitude of the output signal of the vibration sensor 2 is obtained, and this moving average value is compared with the body movement threshold value (S11). If the moving average value exceeds the body motion threshold value (S11: Y), the state transitions to the body motion state ST3 (S12). Further, if the moving average value is equal to or less than the body movement threshold (S11: N) and a heartbeat is detected (S13: Y), the transition is made to the in-bed state ST1 (S14), and no heartbeat is detected (S13). : N), transition to the absence state ST2 (S15). Therefore, the transition from the undefined state ST0 to the three types of states, the bed state ST1, the absent state ST2, and the body movement state ST3, is possible.

  Also in the body movement state ST3, the body movement threshold value and the heartbeat vibration are determined as in the undefined state ST0. That is, as shown in FIG. 4, the moving average value of the amplitude of the output signal of the vibration sensor 2 is obtained, and this moving average value is compared with the body movement threshold value (S21). If the moving average value exceeds the body motion threshold (S21: Y), the body motion state ST3 is continued (S22). Further, if the moving average value is equal to or less than the body movement threshold (S21: N) and a heartbeat is detected (S23: Y), the state transits to the stagnation state ST1 (S24), and if the heartbeat is not detected (S23). : N), transition to the absence state ST2 (S25). Therefore, in the body movement state ST3, the body movement state ST3 can be maintained, or a transition to one state of the bed state ST1 and the absence state ST2 can be performed.

  In the presence state ST1, all the above-described three types of determination are used. As shown in FIG. 5, the moving average value of the amplitude of the output signal of the vibration sensor 2 is obtained, and this moving average value is compared with the body movement threshold value (S31). If the moving average value exceeds the body motion threshold value (S31: Y), the state transitions to the body motion state ST3 (S32). If the moving average value is equal to or less than the body movement threshold value (S31: N) and a heartbeat is detected (S33: Y), the in-bed state ST1 is maintained (S34), and the heartbeat is not detected (S33). : N), the determination based on the specified bed leaving detection time is performed (S35), and if the vibration sensor 2 detects no vibration with an amplitude equal to or greater than the body movement threshold and the heartbeat is not detected during the bed leaving detection time. (S35: Y), the in-bed state ST1 is maintained (S34). When the vibration sensor 2 detects no vibration with an amplitude equal to or greater than the body movement threshold and the heartbeat is not detected beyond the bed detection time (S35: N), the state transitions to the absence state ST2 (S36). Therefore, in the stagnation state ST1, the stagnation state ST1 is maintained, or a transition to one state of the absence state ST2 and the body movement state ST3 is possible.

  In the absence state ST2, only the determination based on the body movement threshold is used. That is, as shown in FIG. 6, the moving average value of the amplitude of the output signal of the vibration sensor 2 is obtained, and this moving average value is compared with the body movement threshold value (S41). When the moving average value exceeds the body movement threshold (S41: Y), the state transits to the body movement state ST3 (S42), and when the moving average value is equal to or less than the body movement threshold (S41: N), the absence state ST2 Is maintained (S43). In the absence state ST2, only the maintenance of the absence state ST2 and the transition to the body motion state ST3 are possible, and the transition to the bed state ST1 is not possible without passing through the body motion state ST3.

  The operation of the occupancy detection unit 21 in this embodiment will be briefly summarized. First, since there is no history immediately after the power is turned on, the presence signal ST1, the absence condition ST2, and the body movement condition ST3 cannot be distinguished from the output signal of the vibration sensor 2. Therefore, the indefinite state ST0 is entered for a certain time immediately after the power is turned on. From the indeterminate state ST0, it is possible to transition to any of the in-bed state ST1, the absent state ST2, and the body movement state ST3. However, the possibility of transition to the body movement state ST3 by the body movement threshold is first verified, and if it is not the body movement state ST3, it is determined whether it is the bed state ST1 or the absence state ST2.

  The staying state ST1 and the body motion state ST3 can transition to the other two states, but the absent state ST2 can only transition to the body motion state ST3. The transition from the body movement state ST3 to the bed state ST1 is a case where the amplitude of the output signal of the vibration sensor 2 is equal to or less than the body movement threshold and heartbeat vibration is detected. When the state in which no vibration is detected continues beyond the bed detection time, the state transits to the absence state ST2.

  When the presence state ST1, the absence state ST2, and the body movement state ST3 are determined by the above-described procedure, the determination result is notified to the sleep environment control unit 23 through the communication unit 22. In the sleep environment control unit 23, a plurality of scenarios are set for the sleep environment. Here, a case will be described in which three types of scenarios, a sleep onset scenario, a deep sleep scenario, and a wake-up scenario are prepared.

  In the sleep environment control unit 23, when the determination result of the occupancy detection unit 21 transitions from the absence state to the body movement state and further transitions to the occupancy state, the occupancy state is determined to be admitted. The sleep-inducing scenario is activated while In the sleep-inducing scenario, the load device is controlled to relax the user on the bed 1. For example, an illuminance 31 is reduced in illuminance and an AV device 32 is relaxed with video and music. The sleep-inducing scenario is activated only during a period in which the user stays in the bed. When the user leaves the bed 1 and goes to a toilet or the like, the sleep-inducing scenario is canceled. Therefore, the sleep-inducing scenario is not continuously executed even when the user leaves the bed, and the sleep-inducing scenario is started again by the next bed-in.

  The sleep environment control unit 23 has a built-in clock function, and when a predetermined time has elapsed since the bed detection unit 21 determines that the user is in the bed state, the sleep environment control unit 23 shifts from the sleep-inducing scenario to the deep sleep scenario. In the deep sleep scenario, the operation is stopped if the load device gives a stimulus for awakening the user, and the operation is performed if the load device deepens the user's sleep. For example, the operation of the lighting fixture 31 and the AV device 32 is stopped, and the air conditioner or the like is controlled so that the temperature becomes an appropriate temperature. By the way, in the period when the deep sleep scenario is being executed, when the presence detection unit 21 determines that the user is absent, the user often goes to the toilet or the washroom. . If the luminaire 21 includes a foot lamp, the foot lamp is turned on when the occupancy state shifts from the standing state to the absent state, and the foot lamp is turned off when the luminaire 21 transitions from the absent state to the floor state through the body movement state. You can make it.

  In the transition period from the sleep-inducing scenario to the deep-sleep scenario, the operation of the load device is gradually changed to prevent a sudden change. For example, the illuminance of the lighting fixture 31 is reduced with time, and the luminance and volume of the AV device 32 are gradually reduced.

  When the current time measured by the clock function built in the sleep environment control unit 23 reaches a preset wake-up time, the wake-up scenario is activated when the wake-up detection unit 21 determines that the wake-up state is present. Is done. In the wake-up scenario, the load device is operated so that it gradually awakens. For example, the lighting device 31 is turned on, and the AV device 32 is controlled to give a visual stimulus or an auditory stimulus for awakening. If the opening / closing of the curtain can be controlled, the curtain may be opened.

  As described above, by providing the sleep environment control unit 23, the load suitable for the user's sleep, deep sleep, and awakening based on the three states of the user's bed state, absence state, and body movement state Since the device can be controlled, the improvement of the user's satisfaction can be expected.

  In the configuration example described above, not only the body movement but also the heartbeat vibration is detected by the vibration sensor 2, but a biological sensor for detecting biological information such as heartbeat vibration is provided separately from the vibration sensor 2 that detects the body movement. It may be provided separately. The biological sensor having the same configuration as that of the vibration sensor 2 can be used when detecting a heartbeat. Moreover, you may make it detect body temperature and a body weight as biometric information other than a heartbeat.

  By the way, when detecting heartbeat vibrations, the amplitude varies depending on the installation environment and individual differences of users. Therefore, it is desirable to provide the presence detection unit 21 with a function of automatically adjusting the gain when amplifying the output of the vibration sensor 2 or the biosensor in order to absorb variations in the amplitude of the heartbeat vibration. For example, if it is decided that the user should turn on the power in the state of sleeping on the bed 1, and the heartbeat vibration is detected in an indeterminate state immediately after the power is turned on, it is detected in this state. By adopting a configuration in which the gain is adjusted so that the amplified output level becomes a specified value using the amplitude of the heartbeat vibration as a reference value, the gain can be automatically adjusted.

  In addition, in the configuration example described above, it is possible to make a transition directly from the occupancy state to the absence state, but the transition from the occupancy state to the absence state is not performed. May be configured to transit only to the body movement state. That is, a configuration in which step S35 in FIG. 5 is omitted may be employed. In this case, the body movement state is always passed between the presence state and the absence state. Further, in the above-described example, a configuration for controlling a load device that forms a sleep environment by providing the sleep environment control unit 23 is adopted, but this configuration is not essential, and the presence on the user's bed 1 is not necessary. If it is an application that needs to detect the floor state and the absence state, the output of the bed detection unit 21 can be used without using the sleep environment control unit 23. That is, it is possible to use only the function of determining the presence state and the absence state instead of controlling the load device. Moreover, although the bed 1 was illustrated as bedding, when laying a futon on a mattress, it can be handled similarly to the bed 1.

It is a block diagram which shows embodiment of this invention. It is a state transition diagram of the occupancy detection part in the same as the above. It is a figure which shows the conditions which change from an indefinite state same as the above to another state. It is a figure which shows the conditions which change from a body movement state same as the above to another state. It is a figure which shows the conditions which change to a different state from a siding state same as the above. It is a figure which shows the conditions which change to an other state from an absent state same as the above.

Explanation of symbols

1 bed 2 vibration sensor (also used as biosensor)
DESCRIPTION OF SYMBOLS 20 In-bed determination apparatus 21 In-floor determination part 22 Communication part 30 Load control apparatus 31 Lighting fixture 32 AV apparatus ST1 In-bed state ST2 Absent state ST3 Body movement state

Claims (5)

A vibration sensor that detects vibration of the bedding, a biological sensor that detects the presence or absence of a living body on the bedding, an output signal of the vibration sensor and an output of the biological sensor, and a living body on the bed and the bedding where the living body exists on the bedding A presence determination unit for determining absence of absence, and the presence determination unit determines that the body movement state due to the movement of the living body on the bedding when the amplitude of the output signal of the vibration sensor exceeds a prescribed body movement threshold. If the amplitude of the output signal of the vibration sensor is equal to or less than the body movement threshold value and the living body is detected by the biological sensor, it is determined that the person is in the floor. organism determines absent state when not detected, further transition to the bed state the bed state is detected after it is determined that the body movement from one state being determined missed state, absence state Body movement from the state The bed detecting apparatus characterized by but not transition to the bed state is not detected.   The occupancy detection device according to claim 1, wherein the vibration sensor is also used as the biological sensor and detects a heartbeat from a living body on a bedding.   The occupancy determination unit transitions to the absence state when the occupancy detection time reaches a stipulated state in which the state where no vibration is detected by the vibration sensor and the presence of the living body is not detected by the output of the biological sensor is reached. The in-bed detection device according to claim 1 or claim 2, wherein   The sleep state of the living body is determined using the history of transition of the three states of the body movement state, the bed state, and the absence state detected by the bed detection unit, and the load device that forms the sleep environment is determined according to the sleep state. The occupancy detection device according to any one of claims 1 to 3, further comprising a load control device that performs control according to a scenario.   5. The occupancy detection device according to claim 4, further comprising a communication unit that causes the occupancy detection unit to notify the load control device of the three states via a data transmission path.

Images