JP2518443B2 - Human detection device and air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a person detection device for detecting the presence of a person in a detection area, and more particularly to an improvement of a person detection device for detecting the movement of a person.

(Prior Art) Conventionally, as disclosed in, for example, Japanese Utility Model Publication No. 59-28263, as a human detection device mounted on an air conditioner for controlling conditioned air blown from each air outlet,
A light emitting diode that emits infrared light and a solar cell that detects a change in the intensity of the infrared light emitted from the light emitting diode and reflected by the worker are provided, and the presence or absence of the worker is detected by the change in the intensity of the infrared light. The reflection type human detection device is a known technique.

(Problems to be Solved by the Invention) In the case of the conventional infrared reflection type human detection device, generally, as shown in FIG. 14, for example, an infrared input value to a light receiving portion such as a solar cell has a predetermined value. When the threshold value K is reached, it is determined that there is a person, and when the threshold value K is lower than the value k which is a constant value α, it is determined that the person does not exist or the person has moved.

In that case, when it moves out of the detection width k, it is judged that the movement is small even if the movement distance is small (when moving from the position H _A in the figure by the distance d ₁ ). However, even if the person moves a considerable distance within this detection width k, the movement of the person cannot be detected (when the person moves a distance d ₂ from the position H _B in the figure). That is, there is a problem that the movement cannot be detected corresponding to the distance actually moved by the person, and the responsiveness is not good.

The present invention has been made in view of such a point, and an object thereof is to detect a person's presence once and then to take measures to detect that the person has moved according to the movement distance of the person. The aim is to improve the responsiveness to the movement of people.

(Means for Solving the Problem) As shown in FIG. 1, a first solving means of the present invention for achieving the above object is, as a person detecting device, a light emitting means (H which emits a predetermined amount of infrared rays). ), A light receiving means (J) for receiving an infrared ray emitted from the light emitting means (H) and detecting an input value of the infrared ray, and an output of the light receiving means (J), the input value of the infrared ray being a threshold value. A person detection means (101) for outputting a person detection signal in the above case is provided.

A storage unit (102) for storing an input value of infrared rays detected by the light receiving unit (J) as an initial value when the person detection unit (101) outputs a person detection signal, and the storage unit (102). Which is detected by the light receiving means (J), and a setting means (103) for setting a higher value of the fixed ratio value of the initial value stored in the table and the value obtained by subtracting the fixed value from the threshold value as the movement determination value. Human movement detection means (104) that outputs a human movement signal when the input value of infrared rays is lower than the movement determination value set by the setting means (103).
And is provided.

A second solving means is the above-mentioned first solving means, wherein the light emitting means (H) is arranged at a predetermined opening angle and is a pair of light emitting means (H ₁ ) and (H ₂ ) for alternately emitting infrared rays, The light receiving means (J) is arranged between the light emitting means (H ₁ ) and (H ₂ ). Then, the person detecting means (101) is connected to each of the light emitting means (H
_When the input values of infrared rays emitted from ( ₁ ) and (H ₂ ) are equal to or greater than the threshold value and almost equal to each other, the movement of a person is determined.

The third solution is, as shown in FIGS. 2 and 3,
An air conditioner equipped with the human detection device according to the second solving means, the air conditioner main body (12) sucking indoor air to generate conditioned air, and rotatably provided on the air conditioner main body (12). A blowing duct (16) for blowing the conditioned air, and a duct driving means (2) for rotating the blowing duct (16) within a predetermined range with respect to the air conditioner body (12) to change the blowing direction. The duct drive means (2) is controlled so that the output of the person movement detection means (104) of the person detection device is received and the blowing direction of the conditioned air blown from the blowing duct (16) is directed to the movement direction of the person. The duct control means (25) is provided.

(Operation) According to the invention of claim (1), the input value to the light receiving means (J) of infrared rays emitted from the light emitting means (H) and reflected from the person when the person is present in front of the person. Becomes equal to or greater than the threshold value, and the person detection means (101) outputs a person detection signal. Then, the storage unit (102) stores the infrared input value at that time as an initial value. Furthermore, when a person moves thereafter and the infrared input value to the light receiving means (J) becomes lower than the movement judgment value, the person movement detecting means (10
The person movement signal is output by 4).

In that case, the setting means (103) causes the storage means (1
02) A fixed percentage value of the initial value or a value obtained by subtracting a fixed value from the threshold value, whichever is higher, is set as the movement determination value. Movement determination is performed, and the responsiveness of movement detection is improved.

In the invention of claim (2), in the invention of claim (1), the infrared ray input value from _one of the light emitting means (H ₁ or H ₂ ) is higher than the movement determination value by the human movement detecting means (104). When it becomes low, it is determined that the person has moved in the direction of the other light emitting means (H ₂ or H ₁ ). That is, the lateral movement direction of the person is also reliably detected, so that the movement detection function is further improved.

According to the invention of claim (3), when the person moves from the current position, the duct control means (25) is generated according to the person movement signal output from the person movement detecting means (104) of the person detecting device according to the second aspect. ), The duct drive means (2) is controlled so that the conditioned air blown out from the blowout duct (16) is directed in the moving direction of the person, so that the conditioned air is always supplied in the person's presence direction. Comfortable conditioned air will be obtained.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings starting from FIG.

As shown in FIG. 2 and FIG. 3, (1) is a spot air conditioner, which is provided in various factories or the like and blows cool air to a person to be air-conditioned such as an operator to perform local cooling.

The spot air conditioner (1) is configured such that an air conditioner body (12) is mounted on a wagon (11) having casters (11a) so as to be movable, and the wagon (11) has an upper stage (11).
It is formed in two steps, b) and the lower part (11c). The air conditioner body (12) includes a compressor (12a) and a condenser (1
2b), an expansion mechanism (not shown) and an evaporator (12c) are connected by a refrigerant pipe (not shown), and the compressor (12a) has a lower part of the wagon (11) ( 11
In the lower part (11c) of the wagon (11), a drain tank (13), an electric box (14), etc. are installed in the housing (15) of the air conditioner body (12) in the lower part (11c) of the wagon (11). ) Is stored and installed inside.

The upper part (11b) of the wagon (11) has a housing (1
5) The condenser (12b) and the evaporator (12c) are provided on both sides of the inside, and one motor (12d) is provided in the center.
A condensing fan (12e) and an evaporating fan (12f) are connected to and housed in. In addition, the housing (1
A condenser side exhaust port (15b) is opened in the upper surface plate (15a) of 5), and the blowout duct (16) is connected to the duct driving means (2).
The outlet duct (16) is formed of a flexible pipe whose wind direction is freely changeable, and is attached to the discharge port (12g) of the evaporation fan (12f) of the housing (15). It is communicated via the top plate (15a). Then, the indoor air that has flowed in from one side surface of the housing (15) due to the drive of both fans (12e) and (12f) exchanges heat in the condenser (12b) and becomes warm air, which is above the exhaust port (15b). While being discharged, the indoor air that has flowed in from the other side of the housing (15) exchanges heat in the evaporator (12c) to become cool air, and is blown out from the blowout duct (16) toward the person to be air-conditioned. There is.

Here, in the casing (3) attached to the upper surface plate (15a) of the housing (15), a rotation mechanism (5) for rotatably supporting the blowout duct (16), a motor, A drive mechanism (4), which is composed of a gear or the like and rotationally drives the rotating mechanism (5), is provided, and the blowout duct (16) is connected to the air conditioner body (12) by the both mechanisms (4) and (5). ), The duct drive means (2) is configured to rotate within a predetermined range to change the blowing direction.

Further, the upper portion of the drive mechanism (4) projects above the casing (3) and is covered by the cover member (61). Then, on the upper portion of the cover member (61), a control (control means for controlling the duct means (2) so that the blowing direction of the conditioned air blown from the blowing duct (16) is directed to the moving direction of the human body ( 25) is built in.

In addition, (17) is a drain pan provided in the lower part of the evaporator (12c), and is connected to the drain tank (13) to guide the drain of the evaporator (12c) to the drain tank (13). .

On the other hand, a human detection sensor (8) as a human detection device for detecting a person to be air-conditioned in the front is attached to the upper end of the outlet duct (16), and the human detection sensor (8) is
As shown in FIGS. 4 and 5, a pair of first light emitting element (H ₁ ) and second light emitting element (H ₁ ) which are light emitting means are fixed to the frame (8a) at an opening angle of a predetermined angle θ _3. H ₂ ), and the first light emitting device (H ₁ ) is provided on the left side of the drawing with the second
The light emitting elements (H ₂ ) are arranged on the right side in the figure.
In addition, in the center of the pair of light emitting elements (H ₁ ) and (H ₂ ), that is, both elements (H ₁ ) and (H ₂ ) and a fixed set angle θ ₁ , respectively.
The light receiving element (J) which is the light receiving means is fixed to the frame (8a) so as to have θ _2, and the reflection of infrared rays emitted alternately from the light emitting elements (H ₁ ) and (H ₂ ) is received. It is designed to be detected by the element (J). However, in this embodiment, θ ₁ = θ ₂ = θ, and therefore θ ₃ =
It is set to 2θ.

Here, each of the above light emitting elements (H ₁ ) and (H ₂ ) has a predetermined directivity angle ± θ _H , that is, the direction in which the intensity of infrared rays emitted is equal to or higher than a certain level is a certain angle ± θ.
_It has a directivity that is limited to within _H. Further, the light receiving element (J) also has directivity in which the range of human light direction capable of detecting infrared rays is limited to a predetermined directivity angle ± θ _J. Then, the set angle θ
And the directivity angles ± θ _H and ± θ _J are determined so that θ _H <θ <θ _H + θ _J.

That is, as shown in FIG. 5, both light emitting elements (H ₁ ),
Infrared light emitted from the light emitting element (H ₁ ) or (H ₂ ) due to the positional relationship between (H ₂ ) and the light receiving element (J) overlapping the range of both directional angles ± θ _J and ± θ _H. There is at least one smooth plane such that the light is reflected within the range of the light receiving element (J) directivity angle ± θ _J , and the directivity angles of both light emitting elements (H ₁ ) and (H ₂ ) The ranges of ± θ _H do not overlap with each other, and both light emitting elements (H ₁ ),
There is no smooth plane where infrared rays from (H ₂ ) are simultaneously reflected by the light receiving element (J).

That is, infrared rays emitted from a pair of light emitting elements (H ₁ ) and (H ₂ ) and reflected by one smooth plane forming the surface of the specular reflector (MR) are detected by the light receiving element (J) at the same time. Make sure that the light does not enter at an intensity above the judgment level V _s 1,
That is, as shown in FIG. 6, which light-emitting element (H ₁ )
Infrared rays from (H ₂ ) are not input to the light receiving element (J), or, as shown in FIG. 7, only infrared rays from _one light emitting element (for example, H ₁ ) are input.

On the other hand, as shown in FIG. 8, an object that causes irregular reflection, that is, the clothes (Cl) of the person to be air-conditioned extends over the directivity angle ± θ _H region of both light emitting elements (H ₁ ) and (H ₂ ). When present, the infrared intensity A _L , A _R from both light-emitting elements (H ₁ ) and (H ₂ ) is simultaneously above a predetermined human detection determination level V _s 1 as the first set value due to diffused reflection on the surface. Light is incident on the light receiving element (J), and a part of clothes (Cl) or the like exists within the directional angle ± θ _H region of _one light emitting element (for example, H ₁ ), but the other light emitting element (H ₂₎ ), If only a part thereof does not exist within the directional angle ± θ _H region, only the infrared rays from the light emitting element (H ₁ ) are input to the light receiving element (J) at the intensity of the human detection determination level V _s 1 or higher. It is designed to be. Further, when the clothes (Cl), that is, the person to be air-conditioned moves, as shown in FIG. 9, the infrared input value A _L from the first light emitting element (H ₁ ) is changed as shown at time t ₄ in FIG. A second setting in which the human detection determination level V _s 1 or higher is maintained, but the infrared input value A _R from the second light emitting element (H ₂ ) is set to be lower than the human detection determination level V _s 1 by a certain value. Human movement determination level V _s 2 as a value
It is designed to be as follows. Similarly, when the human body moves to the right side, as shown at time t ₅ in FIG. 11, the infrared input value A _R from the second light emitting element (H ₂ ) becomes the human detection determination level V _s 1 or more. In addition, the infrared input value A _L from the first light emitting element (H ₁ ) is set to be the human movement determination level V _s 2 or less.

Here, as a feature of the present invention, the person movement determination level V _s 2 is determined as follows.

That is, when the input values A _L and A _R from the light emitting elements (H ₁ ) and (H ₂ ) are both the human detection determination level V _s 1 or higher,
That is, the input values A _L and A _R at the time of human detection are stored as the initial value M, and the half value (1/2) M of the initial value M is set as m, which is constant from the human detection determination level V _s 1. Value obtained by subtracting the value α (V
_{When s} 1−α) is k, (i) when m ≧ k, V _s 2 = m (ii) when m <k, V _s 2 = k.

The air conditioning control operation of the spot air conditioner (1) is performed in a fixed mode in which the blowout duct (16) is fixed while facing in a fixed direction, and an automatic swing mode in which the blowout duct (16) automatically swings. And the blowing duct (16) is rotated in a person tracking mode in which the blowing duct (16) rotates following the movement of the person to be air-conditioned.

Next, the control content of the tracking mode will be described based on the flowchart of FIG. 12 with reference to the timing charts of FIGS. 10 and 11. Here, the upper, middle and lower diagrams of FIG. 10 show the on / off state of the first light emitting element (H ₁ ), the on / off state of the second light emitting element (H ₂ ), and both light emitting elements (H ₁ ), ( It shows the time change of the infrared input values A _L and A _R from H ₂ ).

In the flow of FIG. 12, the light emitting elements (H ₁ ) and (H ₂ ) and the light receiving element (J) are turned on and the infrared input values A _L and A _R to the light receiving element (J) are set as follows. The control for determining the presence and movement of the human body is performed from.

First, in step S ₁ , it is determined whether the human detection flag (H _KF ) is “1” or “0”, that is, whether the human body is being detected. If the human body is not detected, in step S ₂ , each light emitting element is further detected. The values of the infrared input values A _L and A _R from (H ₁ ) and (H ₂ ) and the human detection determination level V _s 1 are compared. And the input value
At least one of A _L and A _R is the human detection determination level V
When it is lower than _s 1 (for example, time t _{1 in} FIG. 10), a person undetected signal is output in step S ₃ .

Then, in step S ₄ , the half value m of the initial value M set in step S ₉ to be described later is compared with the human detection determination level V _s 1, and if m ≧ Vsl, it remains as it is, and m <V _s 1 If there is, the memory (initial value) M is cleared in step S ₅ , and then the process returns. That is, when the person detection determination level V _s 1 itself is changed such as when the distance adjusting monitor is moved, the stored contents are cleared once.

On the other hand, in the comparison of step S ₂ above, A _L ≧ V _s 1, A _R ≧ V
_{When s} 1 and A _L = A _R (for example, time t _{3 in} FIG. 10), the human detection signal is output in step S ₆ , and step S ₇
To set the human detection flag (H _KF ) to "1". Note that A _L
Even if ≧ V _s 1 and A _R ≧ V _s 2, if A _L = A _R is not satisfied (for example, time t _{2 in} FIG. 10), it is not determined that a human body exists. There is.

Then, in step S ₈ , M = A _R , A _L , and the initial value M
The input to the memory, in step S _9, as m = M × 0.5, after setting the half m, in step S _10, the half-value m
And a value k (= V _s 1−α) obtained by subtracting a constant value α from the preset human detection determination level V _s 1 are compared. Here, in the determination of step S ₁₀ , if m ≧ k, step S
_While V _s 2 = m is set in 11 while m <k, V _s 2 = k is set in step S ₁₂ , the control in steps S ₄ and S ₅ is executed, and then the process returns.

On the other hand, if the human detection flag (H _KF ) changes to “1” in the determination in step S _1, the process proceeds to step S ₁₃ and the infrared input values A _L and A _R and the human movement determination level V _s 2 are detected. Compare the size of. Then, when A _L ≧ V _s 2 and A _R ≧ V _s 2, it is determined that the human body is not moving, and in step S ₁₄ , A _R > A _L
If so, it is determined that the human body is moving slightly to the right, and the right flag (RF) is set to “1”. If A _R <A _L, it is determined that the human body is moving to the left. And set the left side flag (LF) to "1".

On the other hand, it is determined in the above step S ₁₃ that A _L <V _s 2 or A _R
When <V _s 2 (state at time t ₄ or time t _{5 in} FIG. 11), the right side flag (RF) or the left side flag (LF) is set to “1” in step S _{15 as} in step S ₁₄ above. After setting
Outputs outer movement signal in step S _16, after the human detection flag in step S ₁₇ a (H _KF) is set to "0", and clears the initial value M, which is stored in step S _18, step S ₄ ，
The control of S ₅ is performed, and the process returns to the control of step S ₁ .

In the above flow, the infrared input value emitted from each of the light emitting elements (light emitting means) (H ₁ ) and (H ₂ ) by receiving the output of the light receiving element (light receiving means) (J) by the control of step S ₆ A person detecting means (101) for outputting a person detecting signal when A _L and A _R are equal to or higher than the person detecting judgment level V _s 1 (threshold value) is configured, and in step S ₈ , the person detecting means (101) detects the person. A storage means (102) is configured to store the infrared input values A _L and A _R detected by the light receiving element (J) at the time of detection as the initial value M.

Further, by the control of steps S _{10 to} S _12, of the constant ratio value m of the initial value M stored by the storage means (102) and the value obtained by subtracting the constant value α from the human detection determination level (threshold value) V _s1. The higher value is the person movement judgment level (movement judgment value)
Configured the setting means (103) to be set as V _s2, the control of the step S _16, after receiving the human detection signal from the human detection means (101), infrared input value A _L of the light receiving element (J),
A person movement detection means (104) is configured to output a person movement signal when A _R becomes lower than the person movement determination level V _s 2 set by the setting means (103).

Then, in the spot air conditioner (1), when the person movement signal from the person movement detecting means (104) is received, the controller (duct control means) (25) causes the blowing duct (16) to move in the person's moving direction. ) Is controlled so that the duct drive means (2) faces. That is, when the right flag RF at the step S ₁₅ is "1", the direction air duct (16) is on the right, outlet duct (16) is controlled so as to face the left side when the left flag LF is "1" . Then, the infrared input values A _L and A _R to the light receiving means (J) again become the human detection determination level V _s 1 or higher, and the human detection means (10
When the person detection signal is output from 1), the blowing duct (16) is stopped at that position, and the control of steps S _{1 to} S ₁₈ is executed to continue the person tracking.

In the above embodiment, a pair of light emitting elements (H ₁ ),
Although (H ₂ ) is provided, the present invention is not limited to such an example, and a single light emitting element may be arranged. Further, it is not always necessary to detect the movement of a person, and it may be a method of detecting only the movement of the person from the current location to another location.

In that case, in the spot air conditioner (1), for example, the duct control means (25) controls the duct drive means (2) to rotate the blowout duct (16) to scan the entire human detection sensor indoors. By stopping the blowout duct (16) at a position where the infrared input value to the light receiving element (J) becomes equal to or higher than the threshold value V _s 1, and performing the control of the above steps S _{1 to} S ₁₈ , the blowout duct ( It is possible to control the direction of the blown air blown from 16) to be in the direction of movement of the person.

In the present embodiment, when a human body is present in front, the infrared rays emitted from the light emitting elements (light emitting means) (H ₁ ) and (H ₂ ) are diffusely reflected by the clothing (Cl) of the human body, and the light receiving element (light receiving element) (Means) (J) When the infrared input values A _L , A _R to the human detection judgment level V _s 1 or more, the human detection means (101) outputs a human detection signal indicating that a person is present. It

When a person moves to another place while monitoring the person at the place where the person is detected, infrared reflection from the person is reduced, and infrared input values A _L and A _R to the light receiving element (J) are reduced. Becomes lower than a predetermined value (person movement determination level) V _s 2, the person movement detecting means (104) outputs a person movement signal.

Here, when the value k obtained by subtracting the predetermined value α from the human detection determination level V _s 1 is used as the general method as the human movement determination level V _s 2 for determining the movement of a person, FIG. As shown in FIG. 7, regardless of the length of the person's movement distance, it is determined that the person has moved when the person goes outside a predetermined area (within the radius of k in the figure). That is, a slight distance from the position of H _{A in} the figure
Even if it moves by d ₁ , a person movement signal is output if it goes out of the radius k, but if it moves from the position of H _{B in} the figure by a larger distance d ₂ and it is within the range of the radius k. The person movement signal is not output, and the responsiveness to person movement is not good.

On the other hand, in this embodiment, the input values A _L and A _R when the presence of a person is detected are stored in the storage means (102) as the initial value M, and the initial value M is kept constant by the setting means (103). Ratio value m (half value in this embodiment) and human detection determination level V _s1
Since the person movement determination level V _s2 is the higher value of the value k obtained by subtracting a certain value α from the person movement determination level V _s2 , as shown in FIG. 13, the human presence positions H _A and H _B before movement differ. Also in this case, the person movement signal is output according to the length of the movement distance, and the responsiveness to the movement of the person can be improved. On the other hand, when the infrared input values A _L and A _R become lower than the value k obtained by subtracting the constant value α from the threshold value V _s 1 before it becomes equal to or smaller than the determination value m corresponding to the moving distance, the human movement signal is output. Therefore, the responsiveness in the area outside the radius k is not deteriorated.

For example, light emitting elements (H ₁ ) and (H ₂ ) and light receiving elements (J)
The presence of a person is detected at a distance L ₁ from
If A ₁ and then the input value at distance L ₂ when it is determined to be a person's movement is A ₂ , then A ₁ = C / L ₁ ² A ₂ = C / L ₂ ² (where C is a constant) In the embodiment, when the input value is half (0.5) of the initial value M, it is determined that the person is moving. Therefore, A ₂ = A ₁ × (1/2), so that C / 2L ₁ ² = C / L ₂ ² Therefore, L ₂ =, √2L ₁ .

That is, it is determined that the person has moved when the person has moved by a distance of √2 times the detected distance of the person.

Specifically, if K is set so as to detect a person at a position 1.5 m away from the sensor, the values of the moving positions corresponding to k and m in the above embodiment are as shown in Table 1 below.

Therefore, although it depends on the value of α, there is a position where the moving position determined by m becomes farther than the moving position determined by k when the detection position becomes far. However, in the present invention, the infrared ray is set by the setting means (103). The higher the input value A _L or A _R is either m or k, the higher the human movement judgment level (movement judgment value).
Since it is set to V _s 2, the detection accuracy is not deteriorated as compared with the case where the determination is made by the value k obtained by subtracting the constant value α from the person movement determination level V _s 1, and the response when detecting the person movement is provided. It can be seen that the property has improved.

In particular, the light emitting means a pair of light emitting elements (H _1), constituted by (H _2), both the light-emitting element (H _1), infrared input values from the (H ₂₎
When both A _L and A _R are equal to or higher than the human detection determination level V _s 1 (threshold value), the human detection means (101) outputs a human detection signal, and thereafter, the person moves from the place and receives light. When either one of the infrared input values A _L and A _R to the element (J) (for example, the input value A _L from the first light emitting element (H ₁ )) becomes the person movement determination level V _s 2 or less, the person moves. Detection means (104)
Thus, when it is determined that the person has moved to the other light emitting element (H ₂ ) side and the person movement signal is output, the following remarkable effects can be exhibited.

That is, only when the input value from _one light emitting element (H ₁ or H ₂ ) becomes lower than the person movement determination level V _s 2 (see the left side or the right side in FIG. 11), the person movement detecting means (104 ) Determines that the human body has moved and outputs a human detection signal, so even if another human body crosses the front and rear of the human body currently being tracked, as long as the human body being tracked remains stationary, Due to infrared reflection, one of them does not drop below the human movement determination level V _s 2 and there is an advantage that it is possible to effectively prevent the possibility of erroneously determining that the human body has moved even though it has not moved.

In the above embodiment, a pair of light emitting elements (H ₁ ),
(H ₂ ) is arranged so that the light emitting directivity angles ± θ _H and ± θ _H do not overlap each other, and the light receiving element (J) has a light receiving directivity angle ± θ _J of each of the light emitting elements (H ₁ ) and (H Since it is arranged so as to partially overlap the light emission directivity angles ± θ _H and ± θ _{H of 2} ), even if there is a specular reflector (MR) behind,
The infrared rays reflected from the specular reflector (MR) do not cause a false detection of the presence of a person.

In addition, according to the person movement signal output from the person movement detection means (104) of the person detection sensor (person detection device), the controller (duct control means) (25) of the air conditioner
By controlling the duct drive means (2) so that the blowing direction of the conditioned air blown out from the blowing duct (16) is in the moving direction of the person, the conditioned air is surely supplied to the place where the person is present, and it is comfortable. It is possible to realize a special air-conditioned space.

(Effect of the invention) As described above, according to the invention of claim (1),
As a person detection device, the light receiving means detects the input value of infrared rays emitted from the light emitting means and reflected by the person, detects the person when the input value is equal to or more than the threshold value, and initializes the input value at that time. It is stored as a value, and the higher value of the constant percentage value of the initial value and the value obtained by subtracting a fixed value from the threshold value is set as the person movement determination value, and then the infrared input value is set to be greater than the person movement determination value. Since the person movement signal is output when the height becomes low, movement detection can be performed according to the movement distance of the person, and the responsiveness of movement detection can be improved.

According to the invention of claim (2), in the above-mentioned claim (1), a pair of light emitting means is provided, the light receiving means is arranged between them, and the infrared input value from one of the light emitting means is more than the person movement determination value. When it becomes low, it is determined that the person has moved to the side of the other light emitting means, so the movement of the specific person can be tracked without being affected by the intrusion of the detection position of the other person. However, the moving direction can be detected, and more accurate movement detection and more comfortable air conditioning control can be performed.

According to the invention of claim (3), the person detecting device of the invention of claim (2) is mounted on an air conditioner, and the blowout duct is rotated so as to supply the conditioned air in the moving direction of the person. Therefore, it is possible to make the supply direction of the conditioned air follow the movement of the person with high responsiveness, and thus improve the comfort of the air conditioning.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 13 show an embodiment of the present invention, FIG. 2 is a vertical sectional front view of a spot air conditioner, FIG. 3 is a vertical sectional side view of a spot air conditioner, and FIG. 4 is a part of a human detection sensor. FIG. 5 is an explanatory view showing the relationship between the directional angle regions of the light emitting element and the light receiving element, FIGS. 6 and 7 show the infrared ray receiving state by the reflected light of the specular reflector, and FIG. Is an explanatory view showing a light entering state when the specular reflectors are present in parallel, and FIG. 7 is an explanatory view showing a light entering state when the specular reflectors are inclined, and FIGS. FIG. 8 is an explanatory diagram showing an input state when the human body is present in front of the human detection sensor, and FIG. 9 is an explanatory diagram showing an input state when the human body moves to the left,
FIG. 10 shows a change in the human detection state, the same figure shows an ON / OFF state of the first light emitting element, the same figure shows an ON / OFF state of the second light emitting element, and the same figure shows a time chart showing a change in input value of the light emitting element. FIG. 11 is a time chart diagram showing a change in infrared input value when a human body moves left and right, FIG. 12 is a flow chart diagram showing control contents in input value determination control, FIG.
The figure is an explanatory view showing the effect of the present invention. FIG. 14 is an explanatory diagram showing a method for detecting a person movement according to a conventional technique. 2 ... Duct drive means 8 ... Human detection sensor (human detection device) 12 ... Air conditioner main body 16 ... Blowing duct 25 ... Controller (duct control means) 101 ... Human detection means 102 ... Storage means 103 ... ... Setting means 104 ... Person movement detecting means H ... Light emitting element (light emitting means) J ... Light receiving element (light receiving means)

Claims (3)

(57) [Claims] 1. A light emitting means (H) for emitting a predetermined amount of infrared light, and a light receiving means (J) for receiving an infrared ray emitted from the light emitting means (H) and detecting an input value of the infrared ray.
And a person detecting means (10) for receiving the output of the light receiving means (J) and outputting a person detecting signal when the input value of infrared rays is equal to or more than a threshold value.
1) and a storage means (102) for storing an input value of infrared rays detected by the light receiving means (J) as an initial value when the person detection means (101) outputs a person detection signal. Memory means (10
2) a setting means (103) for setting a higher value out of a fixed percentage value of the initial value stored in the threshold value and a value obtained by subtracting a fixed value from the threshold value as a movement determination value; and the light receiving means (J). A human movement detecting means (104) for outputting a person movement signal when the detected input value of infrared rays becomes lower than the movement judgment value set by the setting means (103). Person detection device. Wherein the light emitting means (H) is disposed at a predetermined opening angle, a pair of light emitting means for emitting infrared alternately (H _1),
(H ₂ ), the light receiving means (J) is arranged between the light emitting means (H ₁ ) and (H ₂ ), and the human detecting means (101) is the light emitting means. The human movement detection means (104) outputs the human detection signal when the input values of the infrared rays emitted from (H ₁ ) and (H ₂ ) are greater than or equal to a threshold value and substantially equal to each other. When the input value from (H ₁ or H ₂ ) becomes lower than the above movement determination value, it is determined that the person has moved to the other light emitting means (H ₂ or H ₁ ) side, and the person movement signal is output. The person detecting apparatus according to claim 1, wherein the person detecting apparatus outputs the person. 3. A pair of light emitting means (H ₁ ) and (H ₂ ) arranged at a predetermined opening angle and alternately emitting infrared rays, and between the respective light emitting means (H ₁ ) and (H ₂ ). Arranged light emitting means (H)
From the light emitting means (H ₁ ) and (H ₂ ) receiving the output of the light receiving means (J) for detecting the input value of the infrared light by receiving the reflection of the infrared light emitted from the light emitting means (H ₁ ) and (H ₂ ) A person detecting means (101) for outputting a person detecting signal when the input values of the received infrared rays are equal to or more than a threshold value and substantially equal to each other, and the light receiving means (J) when the person detecting means (101) outputs the person detecting signal. Of the input value of the infrared rays detected by the storage means (102) as an initial value, a fixed ratio value of the initial value stored in the storage means (102) and a value obtained by subtracting a fixed value from the threshold value. The setting means (103) for setting either higher value as the movement determination value and the light receiving means (J) output, and the infrared input value from _one light emitting means (H ₁ or H ₂ ) is the setting means. When it becomes lower than the movement judgment value set in (103), the other Provided with a human detection device and means human movement detection means human on the side of the (H ₂ or H ₁₎ outputs a human movement signal to determine that it has moved (104), the conditioned air is sucked indoor air To generate the air conditioner body (1
2), a blower duct (16) rotatably provided on the air conditioner body (12) for blowing out conditioned air, and the blower duct (1).
6) the duct drive means (2) for rotating the air conditioner body (12) within a predetermined range to change the blowing direction, and the output of the human movement detection means (104) of the human detection device, An air conditioner characterized by comprising duct control means (25) for controlling the duct drive means (2) so that the direction of the conditioned air blown out from the blowout duct (16) is directed to the moving direction of a person. apparatus.