Patent Publication Number: US-9841216-B2

Title: Indoor unit of air-conditioning apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is based on Japanese Application No. 2013-208801, filed on Oct. 4, 2013, the disclosure of which is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to an indoor unit of an air-conditioning apparatus, and more specifically, to an indoor unit of an air-conditioning apparatus capable of changing the blowing direction of conditioned air. 
     BACKGROUND 
     Hitherto, an indoor unit of an air-conditioning apparatus (hereinafter, referred to as an “indoor unit”) which detects the location of a person who is present in a room (hereinafter, referred to as a “person-in-room”) and which blows air in a manner which avoids the person-in-room or, on the contrary, in a manner which blows air toward the person-in-room, in order to enhance the comfort of the person-in-room, has been known. 
     The indoor unit not only detects the location of a person-in-room but also detects the activity state of the person-in-room and controls the temperature, the amount, and the blowing direction of conditioned air, based on the activity state. That is, an indoor unit is disclosed in which when the indoor unit detects that the amount of activity of the person-in-room (hereinafter, referred to as a “user”) has increased due to light exercise or light labor, air is intensively blown to the user to remove the amount of heat generated by the activity, so that an increase in the body temperature of the user is suppressed and therefore the user does not feel hot (for example, see Patent Literature 1). 
     PATENT LITERATURE 
     
         
         [Patent Literature 1] Japanese Unexamined Patent Application Publication No. 6-323599 (Pages 3 to 5, FIG. 2) 
       
    
     The indoor unit disclosed in Patent Literature 1 is configured to intensively blow air toward the user when an increase in the amount of activity along with an activity is detected. Therefore, since the amount of activity is small at a time immediately after a user takes a bath or immediately after a user enters a room from hot (or cold) outdoors, a demand of wanting to temporarily and quickly feel cool (or warm) immediately after taking a bath or immediately after entering a room from hot (or cold) outdoors cannot be met. 
     Furthermore, since it is necessary to operate a remote controller or the like to activate an indoor unit (refrigeration cycle) and to adjust the blowing direction of conditioned air immediately after taking a bath or immediately after entering a room from hot (or cold) outdoors, complicated operations, such as looking for the remote controller and operating the remote controller or the like, are required. Therefore, the above-mentioned demand cannot be met quickly. 
     It is further necessary to operate the remote controller or the like to stop air-blowing (refrigeration cycle) when the user feels cool enough (or warm enough), which makes operations cumbersome. 
     SUMMARY 
     The present invention meets the above-mentioned demand and obtains an indoor unit of an air-conditioning apparatus that attains at least one of a first object of easily and quickly activating a refrigeration cycle without requiring an operation on a remote controller or the like, a second object of easily and quickly directing the blowing direction of conditioned air toward a person who wishes to receive conditioned air, without requiring an operation on a remote controller or the like, a third object of easily and quickly stopping air-blowing (refrigeration cycle) without requiring an operation on a remote controller or the like when a person feels cool enough (or warm enough), and a fourth object of easily finding a remote controller when a person has trouble finding the remote controller. 
     An indoor unit of an air-conditioning apparatus according to the present invention includes a heat exchanger that performs part of a refrigeration cycle, an imaging device that captures an image of a room, and a controller that controls at least the refrigeration cycle, based on information of a person whose image is captured by the imaging device. When the refrigeration cycle is stopped, in a case where a face of the person whose image is captured by the imaging device remains stationarily facing the imaging device for a preset recognition time, the controller activates the refrigeration cycle. 
     With the indoor unit of the air-conditioning apparatus according to the present invention, when the face of the person remains stationarily facing the imaging device for the preset recognition time, the refrigeration cycle is activated. Therefore, the person is able to activate the refrigeration cycle easily and quickly without performing an operation on the remote controller or the like. 
     That is, for example, if a user (person) who has just taken a bath or just entered the room from hot or cold outdoors is located within a visual field of the imaging device, only by allowing the face of the person to face the indoor unit only for at least the recognition time, as long as the person is located inside the room, the refrigeration cycle can be activated. Therefore, the time and effort for looking for the remote controller and operating the remote controller can be saved, and convenience is thus improved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1A  is a front view for explaining an indoor unit of an air-conditioning apparatus according to Embodiment 1 of the present invention, and shows an indoor unit main body. 
         FIG. 1B  is a front view for explaining the indoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention, and shows a remote controller. 
         FIG. 2  is a sectional side view of the indoor unit main body illustrated in  FIG. 1A . 
         FIG. 3  is a perspective view of an extracted part (near an air outlet) of the indoor unit main body illustrated in  FIG. 1A . 
         FIG. 4A  is a side view illustrating a procedure of recognition of a human face by the indoor unit illustrated in  FIG. 1A . 
         FIG. 4B  is a plan view illustrating the procedure of recognition of the human face by the indoor unit illustrated in  FIG. 1A . 
         FIG. 5A  is a side view illustrating a procedure of recognition of a human face by the indoor unit illustrated in  FIG. 1A . 
         FIG. 5B  is a plan view illustrating the procedure of recognition of the human face by the indoor unit illustrated in  FIG. 1A . 
         FIG. 6  is a flowchart for illustrating control steps by the indoor unit illustrated in  FIG. 1A . 
         FIG. 7  is a temperature variation diagram schematically illustrating variations in the temperature by swing blowing, for illustrating an indoor unit of an air-conditioning apparatus according to Embodiment 2 of the present invention. 
         FIG. 8  is a flowchart for illustrating control steps by the indoor unit of the air-conditioning apparatus according to Embodiment 2 of the present invention. 
         FIG. 9A  is a front view for explaining an indoor unit of an air-conditioning apparatus according to Embodiment 3 of the present invention, and shows a main body. 
         FIG. 9B  is a front view for explaining the indoor unit of the air-conditioning apparatus according to Embodiment 3 of the present invention, and shows a remote controller. 
         FIG. 10  is a flowchart for illustrating control steps by the indoor unit of the air-conditioning apparatus according to Embodiment 3 of the present invention. 
         FIG. 11A  is a front view for explaining an indoor unit of an air-conditioning apparatus according to Embodiment 4 of the present invention, and shows a main body. 
         FIG. 11B  is a front view for explaining the indoor unit of the air-conditioning apparatus according to Embodiment 4 of the present invention, and shows a remote controller. 
         FIG. 12  is a flowchart for illustrating control steps by the indoor unit of the air-conditioning apparatus according to Embodiment 4 of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiment 1 
       FIGS. 1 to 3  illustrate an indoor unit of an air-conditioning apparatus according to Embodiment 1 of the present invention.  FIG. 1A  is a front view of an indoor unit main body.  FIG. 1B  is a front view of a remote controller provided in the indoor unit.  FIG. 2  is a sectional side view of the indoor unit main body.  FIG. 3  is a perspective view of an extracted part (near an air outlet) of the indoor unit. Each of the figures is schematically rendered, and the present invention is not limited to the forms illustrated in the figures. 
     (Main Body) 
     Referring to  FIG. 1A , an indoor unit of an air conditioning apparatus (hereinafter, referred to as an “indoor unit”)  100  includes a main body  1  that has an air inlet  3  formed in an upper part thereof and an air outlet  7  formed in a lower part thereof, a front panel  2  that covers the front side of the main body  1  in such a manner that the front side can be covered or uncovered freely, a fan  5  that sucks indoor air through the air inlet  3  and forms an air path  6  which reaches the air outlet  7 , and a heat exchanger  4  that is installed on an upstream side (near the air inlet  3 ) of the fan  5 . 
     A main body communication device  60  that receives a signal from a remote controller  80  and an imaging device  50  that captures an image of an indoor state are installed beside the air outlet  7  on the front side of the main body  1 . 
     In the present invention, the type and the installation location of the main body communication device  60  and the imaging device  50  are not limited. For example, the main body communication device  60  and the imaging device  50  may be installed at the center of the front panel  2  or the like. Furthermore, a reporting device (not illustrated) that reports the operation status of the indoor unit  100  using a sound or image is provided on the main body  1  or the remote controller (not illustrated). 
     The heat exchanger  4 , which performs part of a refrigeration cycle, includes a heat exchange front portion  4   a , which is a portion that is substantially parallel to the front panel  2 , a heat exchange upper front portion  4   b , which is a portion that is diagonally upper near the front side of the fan  5 , and a heat exchange upper rear portion  4   c , which is a portion that is diagonally upper near the rear side of the fan  5 . A drain pan  8  is arranged below the heat exchange front portion  4   a . An upper surface  8   a  of the drain pan  8  forms a drain pan surface that actually receives drain, and a lower surface  8   b  of the drain pan  8  forms a front side of the air path  6 . 
     (Air Flow Direction Adjusting Device) 
     A left-side left/right air flow direction plate group  10 L and a right-side left/right air flow direction plate group  10 R (collectively or individually referred to as a “left/right air flow direction plate  10 ”) that adjust the horizontal (left/right) blowing direction of indoor air conditioned at the heat exchanger  4  (hereinafter, referred to as “conditioned air”) are arranged in the air path near the air outlet  7 . An up/down air flow direction plate  9  (a front up/down air flow direction plate  9   a  and a rear up/down air flow direction plate  9   b  are collectively referred to as an “up/down air flow direction plate  9 ”) that adjusts the vertical (up/down) blowing direction of conditioned air is arranged at the air outlet  7 , which is located at the end of the air path  6 . The left/right air flow direction plate  10  and the up/down air flow direction plate  9  function as an air flow direction adjusting device. 
     The “left-side” plate and the “right-side” plate represent, for convenience, a plate that can be viewed on the left-hand side and a plate that can be viewed on the right-hand side, respectively, when the room is viewed from the indoor unit  100 , that is, when the direction toward the front panel  2  is viewed from the rear side of the main body  1 . 
     (Left/Right Air Flow Direction Plate) 
     Referring to  FIG. 3 , the right-side left/right air flow direction plate group  10 R includes left/right air flow direction plates  10   a ,  10   b , . . . , and  10   g . The right-side left/right air flow direction plate group  10 R is rotatably arranged at the lower surface  8   b  of the drain pan  8  and is connected to a right-side connecting bar  20 R. The left-side left/right air flow direction plate group  10 L includes left/right air flow direction plates  10   h ,  10   i , . . . , and  10   n  and is connected to a left-side connecting bar  20 L. 
     The right-side left/right air flow direction plate group  10 R and the right-side connecting bar  20 R form a link mechanism, and the left-side left/right air flow direction plate group  10 L and the left-side connecting bar  20 L form a link mechanism. A right-side driving unit (not illustrated) is connected to the right-side connecting bar  20 R, and a left-side driving unit  30 L is connected to the left-side connecting bar  20 L. 
     Accordingly, when the right-side connecting bar  20 R is translated by the right-side driving unit, the left/right air flow direction plates  10   a ,  10   b , . . . , and  10   g  move rotationally while keeping parallel to one another. Furthermore, when the left-side connecting bar  20 L is translated by the left-side driving unit  30 L, the left/right air flow direction plates  10   h ,  10   i , . . . , and  10   n  move rotationally while keeping parallel to one another. Thus, conditioned air can be blown in the same direction over the entire width of the air outlet  7 , conditioned air can be blown in opposite directions between one half and the other half of the width of the air outlet  7 , the directions being away from each other, or conditioned air can be blown in opposite directions between one half and the other half of the width of the air outlet  7 , the directions colliding with each other. 
     In the present invention, the left/right air flow direction plate  10  is not limited by the illustrated form. The number of plates of the left/right air flow direction plate  10  is not particularly limited. Furthermore, the left/right air flow direction plate  10  may be divided into three or more groups. In this case, the individual groups may be rotatably connected to corresponding connecting bars, and the connecting bars may be translated independently. 
     (Up/Down Air Flow Direction Plate) 
     The up/down air flow direction plate  9  has a rotational center that is parallel to a horizontal direction and is rotatably arranged at the main body  1 . The rotational axis of the front up/down air flow direction plate  9   a  and the rotational axis of the rear up/down air flow direction plate  9   b  are connected by a link mechanism or a gear mechanism and are moved rotationally by a common driving motor. 
     In the present invention, the up/down air flow direction plate  9  is not limited by the illustrated from. The front up/down air flow direction plate  9   a  and the rear up/down air flow direction plate  9   b  may be moved rotationally by different driving motors. Furthermore, the front up/down air flow direction plate  9   a  and the rear up/down air flow direction plate  9   b  may each be divided at the center thereof in the left/right direction, and the divided four plates may be moved rotationally in an independent manner. 
     (Remote Controller) 
     Referring to  FIG. 1B , the remote controller  80  transmits an operation signal to the main body  1  (a main body communication device  60 ) and receives operation information from the main body  1 . The remote controller  80  includes an input unit  81  that receives an operation signal input by a person (user), a display unit  82  that displays the received operation signal or the operation information received from the main body  1 , and a communication unit  85  that allows communication with the main body  1 . 
     (Recognition of Human Face) 
       FIGS. 4 and 5  are diagrams for illustrating procedures of recognition of a human face by the indoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.  FIG. 4A  and  FIG. 5A  are schematic side views, and  FIG. 4B  and  FIG. 5B  are schematic plan views. 
     Referring to  FIG. 4A  and  FIG. 4B , the indoor unit  100  is installed at a position on a wall (hereinafter, referred to as a “back-side wall”)  91  of a room  90  near a ceiling surface  92 . The imaging device  50  (for example, a CCD camera having 300 thousand pixels) has an obliquely downward visual field  51 . The spread angle of the visual field  51  differs between the vertical direction and the horizontal direction, and the visual field  51  has a substantially elliptical cone shape. 
     A user U 1  who is located within the visual field  51  is a person who is recognized by a controller  70  as a “person who wishes the refrigeration cycle to be activated (to start operation)”. Meanwhile, each of a user U 2  and a user U 3  is not recognized by the controller  70  as a “person who wishes the refrigeration cycle to be activated (to start operation)”. 
     That is, the user U 1  remains stationarily with a face U 10  of the user U 1  facing the imaging device  50  for a preset recognition time J 1  (for example, three seconds). 
     The term “facing” represents a state in which, on a horizontal plane, the angle formed by a radial line (expressed by a dashed line) from the imaging device  50  and a virtual line connecting an eye U 11   a  and an eye U 11   b  is a vertical angle, and on a vertical plane, the angle formed by a radial line (expressed by a dashed line) from the imaging device  50  and a virtual line connecting the forehead and the chin (a plane in the case where it is assumed that a face part except the nose is a plane) is a vertical angle. However, these angles are not limited to strictly vertical angles. These angles are approximately “90 degrees±20 degrees”. In actuality, it is not easy to obtain the angle formed by the radial line and a virtual line. Therefore, determination as to a facing state is made based on a different method, instead of based on such an angle (the different method will be explained in detail separately). 
     Furthermore, the term “stationarily” does not necessarily literally represent an absolutely still state. The term “stationarily” also includes a state in which a shake occurs in a way in which an image of a face captured before the shake occurs and an image of the face captured at the time when the shake occurs partially overlap. 
     Specifically, in a captured image of the user U 1 , images of both eyes, the eye U 11   a  and the eye U 11   b , which sandwich a nose U 13  of the face U 10  therebetween, are captured, and therefore the user U 1  faces the imaging device  50  when viewed in the horizontal view. Further, the virtual line connecting the eye U 11   a  and the eye U 11   b  is located in an upper part of the face U 10 , and therefore the user U 1  faces the imaging device  50  when viewed in the side view. Further, the midpoint of the virtual line connecting the eye U 11   a  and the eye U 11   b  is located at substantially the center of the face U 10  (including the head), and therefore the user U 1  faces the imaging device  50  when viewed in the plan view. 
     The user U 2  faces the imaging device  50  when viewed in the side view. However, although an image of the eye U 11   a  of the face U 10  is captured, an image of the eye U 11   b  is not captured since the eye U 11   b  is hidden behind the nose U 13 . Therefore, it is determined that the user U 2  is looking the other way and the user U 2  does not face the imaging device  50  when viewed in the plan view. 
     The user U 3  faces the imaging device  50  when viewed in the plan view. However, the midpoint of the virtual line connecting the eye U 11   a  and the eye U 11   b  is located below the center of the face U 10  (including the head). Therefore, the user U 3  does not face the imaging device  50  when viewed in the side view. 
     (Facing when Viewed in Side View) 
     Next, regarding determination as to “facing”, facing when viewed in the side view and facing when viewed in the plan view will be explained. 
     In  FIG. 5A , in a captured image of the user U 1 , both eyes, the eye U 11   a  and the eye U 11   b , of the user U 1  are recognized. Further, the midpoint of the virtual line connecting the eye U 11   a  and the eye U 11   b  is represented by a midpoint U 11   c , and a radial line from the imaging device  50  passing through the midpoint U 11   c  is represented by a radial line  50   c . Furthermore, in the captured image of the user U 1 , an upper end of the face U 10  (including the head) is represented by an upper end U 12 , and a radial line from the imaging device  50  passing through the upper end U 12  is represented by a radial line  50   a . Meanwhile, in the captured image of the user U 1 , a lower end of the face U 10  (equal to the lower end of the chin) is represented by a lower end U 14 , and a radial line from the imaging device  50  passing through the lower end U 14  is represented by a radial line  50   b.    
     An angle θa formed by the radial line  50   a  and the radial line  50   c  is compared with an angle θb formed by the radial line  50   b  and the radial line  50   c . When the difference between the angle θa and the angle θb (Δθab=|θa−θb|) is small, it is assumed that the user U 1  faces the imaging device  50  when viewed in the side view. The value of the difference between the angle θa and the angle θb (Δθab) is not particularly limited. However, the value is set to about “20 degrees”. 
     (Facing when Viewed in Plan View) 
     In  FIG. 5B , in a captured image of the user U 1 , both eyes, the eye U 11   a  and the eye U 11   b , of the user U 1  are recognized. Further, the midpoint of the virtual line connecting the eye U 11   a  and the eye U 11   b  is represented by a midpoint U 11   c , and a radial line from the imaging device  50  passing through the midpoint U 11   c  is represented by a radial line  50   c . Furthermore, in the captured image of the user U 1 , one side end of the face U 10  (including the head) is represented by a left end U 15 , and a radial line from the imaging device  50  passing through the left end U 15  is represented by a radial line  50   d . Moreover, in the captured image of the user U 1 , the other side end of the face U 10  (including the head) is represented by a right end U 16 , and a radial line from the imaging device  50  passing through the right end U 16  is represented by a radial line  50   e.    
     An angle θd formed by the radial line  50   d  and the radial line  50   c  is compared with an angle θe formed by the radial line  50   e  and the radial line  50   c . When the difference between the angle θd and the angle θe (Δθde=|θd−θe|) is small, it is assumed that the user U 1  faces the imaging device  50  when viewed in the plan view. The value of the difference between the angle θd and the angle θe (Δθde) is not particularly limited. However, the value is set to about “20 degrees”. 
     (Controller) 
       FIG. 6  is a flowchart for illustrating control steps by the indoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. 
     Referring to  FIG. 6 , the controller  70  installed in the indoor unit  100  is configured to activate the refrigeration cycle and adjust the blowing direction of conditioned air (hereinafter, referred to as “air flow direction control), in accordance with indoor environment and a request from a user (person). 
     In the description provided below, a person who has entered a room (undressing room) immediately after taking a bath, a person who has just entered a room from hot (or cold) outdoors, a person who is present in a room and who wishes to temporarily and quickly feel cool (or warm), and the like will be collectively referred to as a user Ua. 
     When the refrigeration cycle is stopped, the user Ua needs to activate the refrigeration cycle and to cause conditioned air to be blown toward the user Ua. When the refrigeration cycle is activated, the user Ua needs to cause conditioned air to be blown toward the user Ua. Hereinafter, a description will be provided with reference to the flowchart ( FIG. 6 ). 
     (Control Flow) 
     Referring to  FIG. 6 , the controller  70  performs the steps described below. The imaging device  50  always (for example, for every one second) captures an image of the room  90 , and inputs the captured image to the controller  70  (S 1 ). 
     The controller  70  determines, based on the captured image, whether or not one or more persons are present in the room  90 , and determines whether or not the face of at least one person who is present in the room  90  remains stationarily facing the imaging device  50  for the recognition time J 1  (for example, three seconds) or more (S 2 ). 
     When it is determined that the face of the person remains stationarily facing the imaging device  50  for the recognition time J 1  or more (S 2 ), if the refrigeration cycle is stopped (S 3 ), the person is determined as a person who wishes the refrigeration cycle to be activated and wishes conditioned air to be blown toward the person (hereinafter, referred to as a “user Ua”). Then, the controller  70  activates the refrigeration cycle (S 4 ). 
     In contrast, when it is determined that the face of the person remains stationarily facing the imaging device  50  for the recognition time J 1  or more (S 2 ), if the refrigeration cycle is running (S 3 ), the person is determined as a person who wishes conditioned air to be blown toward the person (hereinafter, referred to as a “user Ua”, as mentioned above). 
     The controller  70  identifies the location of the user Ua (S 5 ), and controls the attitude of the up/down air flow direction plate  9  and the left/right air flow direction plate  10  so that conditioned air is blown toward the user Ua (hereinafter, referred to as “intensive blowing”) (S 6 ). 
     When it is determined that the faces of plural persons who are present in the room remain stationarily facing the imaging device  50  for the recognition time J 1  or more at the same time, a person who is located near the indoor unit  100  (imaging device  50 ) is referred to as a user Ua. 
     Then, the controller  70  determines whether the user Ua remains at the identified location in the room  90  without moving to a different location or the user Ua has moved to a different location (S 7 ). 
     When the user Ua has not moved to a different location (S 7 ), the controller  70  determines whether or not there is another person (a person different from the user Ua) whose face remains stationarily facing the imaging device  50  for the recognition time J 1  or more (S 8 ). 
     When there is no person (there is only the user Ua) whose face remains stationarily facing the imaging device  50  for the recognition time J 1  or more, intensive blowing toward the user Ua is started (S 6 ), and then the controller  70  determines whether or not a preset intensive blowing time J 2  (for example, ten minutes) has been exceeded (S 9 ). When the intensive blowing time J 2  has not been exceeded, the controller  70  determines that the user Ua does not feel cool enough (or warm enough), and continues intensive blowing (return to S 5 ). 
     In contrast, when there is no person (there is only the user Ua) whose face remains stationarily facing the imaging device  50  for the recognition time J 1  or more (S 8 ), if the intensive blowing time J 2  has been exceeded (S 9 ), the controller  70  determines that the user Ua feels cool enough (or warm enough), and controls the attitude of the up/down air flow direction plate  9  and the left/right air flow direction plate  10  so that conditioned air is blown uniformly inside the room  90  (hereinafter, referred to as “distributed blowing”) (S 10 ). 
     The distributed blowing continues (return to S 10 ) until the user Ua or the person different from the user Ua operates the remote controller  80  to issue an instruction for stopping the operation (stopping the refrigeration cycle) (S 11 ). When the instruction for stopping the refrigeration cycle is issued (S 11 ), the controller  70  stops the refrigeration cycle (S 12 ). 
     When the user Ua has moved to a different location within the room  90  (S 7 ), the controller  70  tracks the movement of the user Ua, and identifies the location to which the user Ua has moved (movement destination) (S 13 ). The controller  70  controls the attitude of the up/down air flow direction plate  9  and the left/right air flow direction plate  10  so that conditioned air continues to be blown toward the user Ua (the location of the user Ua) (so that intensive blowing continues) (S 14 ). After that, similar to the case where it is determined that the user Ua has not moved to a different location, the controller  70  determines whether or not a blowing target is to be changed (whether or not a user Ub is present) (S 8 ). 
     In the determination as to whether or not there is a person (a person different from the user Ua) whose face remains stationarily facing the imaging device  50  for the recognition time J 1  or more, when it is determined that there is a person (a person different from the user Ua) whose face remains stationarily facing the imaging device  50  for the recognition time J 1  or more (hereinafter, referred to as a “user Ub”) (S 8 ), the controller  70  starts intensive blowing toward the user Ua (S 6 ) and then determines whether or not a preset target unchanged time J 3  (a time during which a blowing target is not changed, for example, three minutes) has been exceeded (S 15 ), in order to avoid frequently changing the blowing target for a short period of time. 
     When it is determined that the target unchanged time J 3  has not been exceeded (S 15 ), the controller  70  determines whether or not the user Ua feels cool enough (or warm enough) (proceed to S 9 ). 
     Meanwhile, when it is determined that the target unchanged time J 3  has been exceeded (S 15 ), in order to start intensive blowing toward the user Ub (the location of the user Ub), instead of the user Ua, the controller  70  identifies the location of the user Ub, and starts intensive blowing toward the user Ub (the location of the user Ub). That is, the user Ua is replaced with the user Ub (S 16 ), and the controller  70  proceeds to S 5 . 
     Here, the user Ub and the user Ua may be the same person. In this case, it is determined that the user Ua wishes conditioned air to continue to be blown toward the user Ua. 
     Even while intensive blowing continues, in the case where the user Ua or a person different from the user Ua operates the remote controller  80  to issue an instruction for stopping the operation (stopping the refrigeration cycle), the controller  70  stops the refrigeration cycle (not illustrated). 
     With the execution of the above-described steps by the controller  70  of the indoor unit  100 , the following effects can be achieved: 
     (i) The user Ua is able to activate the refrigeration cycle quickly and certainly without operating the remote controller, and convenience is thus improved. 
     (ii) The user Ua (or the user Ub) is able to control the attitude of the up/down air flow direction plate  9  and the left/right air flow direction plate  10  so that conditioned air is blown toward the user Ua (or the user Ub) without operating the remote controller, and convenience is thus improved. 
     (iii) The intensive blowing time J 2  is provided. Therefore, the user Ua is prevented from being excessively cooled down (or warmed up), without operating the remote controller, and comfort is thus enhanced. 
     (iv) When, instead of the user Ua, the user Ub wishes conditioned air to be blown toward the user Ub, the user Ub is able to cause conditioned air to be blown toward the user Ub quickly and certainly, without operating the remote controller. Thus, convenience is improved. 
     (v) The target unchanged time J 3  is further provided, so that the blowing direction is not frequently changed for a short period of time. Thus, stable control can be achieved. Moreover, since indoor air flows according to the law of inertia which makes it difficult to frequently change the blowing direction for a short period of time, therefore providing the target unchanged time J 3  prevents meaningless control to frequently change the blowing direction for a short period of time. 
     In the above description, intensive blowing represents air-blowing toward the user Ua. However, in the present invention, intensive blowing is not limited to the literal meaning of “air-blowing toward the user Ua”. In the present invention, intensive blowing also includes air-blowing toward directions including the feet of the user Ua and a limited region where the user Ua is located (for example, the range of a sofa on which the user Ua sits). Further, “swing blowing” in which air is intermittently blown toward the direction of the user Ua and the other directions is possible, and the time during which air is blown toward the direction of the user Ua or the amount of air blown toward the direction of the user Ua may be longer or larger than the time during which air is blown toward the other directions or the amount of air blown toward the other directions. 
     At a time immediately after air blowing starts, the air flow of the blown conditioned air can be regarded as a flux having a cross-section substantially the same as the size of the air outlet and having a substantially uniform flow velocity. However, the conditioned air spreads while mixing with surrounding air in the room  90 . Therefore, at a time when the conditioned air actually reaches the user Ua, the air flow has a cross-section larger than the size of the air outlet. Further, also in the cross-section, the air flow becomes a flux aggregation of different flow directions and different flow velocities. Thus, “intensive blowing” in the present invention means that the center of the averaged spread air flow “is directed toward a specific location” and conditioned air reaches also around the location of the user Ua. 
     Embodiment 2 
       FIGS. 7 and 8  illustrate an indoor unit of an air-conditioning apparatus according to Embodiment 2 of the present invention.  FIG. 7  is a temperature variation diagram schematically illustrating variations in temperature by swing blowing, and  FIG. 8  is a flowchart for illustrating control steps. The portions that are the same as or equivalent to portions in Embodiment 1 will be referred to with the same signs, and the steps that are the same as or equivalent to steps in Embodiment 1 will be referred to with the same numbers. Description of Embodiment 2 will be partially omitted. 
     The indoor unit of the air-conditioning apparatus (hereinafter, referred to as an “indoor unit”)  200  is configured to intermittently and repeatedly change the amount of air or the air speed of conditioned air blown toward the user Ua in intensive blowing performed by the indoor unit  100  (Embodiment 1) (hereinafter, referred to as “swing intensive blowing”) and include a temperature detection unit (a temperature sensor, not illustrated) capable of detecting the temperature of the face of the user Ua exposed to swing intensive blowing. 
     (Variations in Temperature of Face) 
       FIG. 7  schematically illustrates variations in the temperature of the face of the user Ua by swing intensive blowing. Referring to  FIG. 7 , when the surface temperature of the face immediately after starting swing intensive blowing is a temperature T 0 , the surface temperature of the face decreases to a temperature T 1  by the first blowing toward the face (the initial air amount or air speed). When the blowing toward the face is interrupted (more accurately, the air amount or air speed decreases (including decreases to zero), the surface of the face recovers heat, and the surface temperature thus increases to a temperature T 2 . Then, by the second blowing toward the face (the initial air amount of air speed), the surface temperature of the face decreases to a temperature T 3 . When the intensive blowing toward the face is interrupted (more accurately, the air amount or air speed decreases (including decreases to zero), the surface temperature increases to a temperature T 4 . Subsequently, by the above-mentioned intermittent repetition of blowing, the surface temperature of the face at the time of blowing and the surface temperature of the face after recovering heat gradually decrease. 
     Here, the degree of decrease in the surface temperature of the face after recovering heat by repetitive swing intensive blowing (the difference between the temperature T 2  and the temperature T 4 , etc.) is greater than the degree of decrease in the surface temperature of the face at the time of blowing by repetitive swing intensive blowing (the difference between the temperature T 1  and the temperature T 3 , etc.). 
     Accordingly, the amount of decrease ΔT 01  in the surface temperature of the face by the first blowing (the difference between the temperature T 0  and the temperature T 1 ), the amount of increase ΔT 12  in the surface temperature of the face by the first heat recovery (the difference between the temperature T 2  and the temperature T 1 ), the amount of decrease ΔT 23  in the surface temperature of the face by the second blowing (the difference between the temperature T 3  and the temperature T 2 ), and the amount of increase ΔT 34  in the surface temperature of the face by the second heat recovery (the difference between the temperature T 4  and the temperature T 3 ) gradually decrease in that order. 
     When the amount of decrease ΔT 01 , ΔT 23 , or the like in the surface temperature of the face by intensive blowing or the amount of increase ΔT 12 , ΔT 34 , or the like in the surface temperature of the face by heat recovery (hereinafter, referred to as a “variation range ΔT of body temperature”) reaches a preset comfortable temperature range ΔTs (for example, 1 degree Centigrade) or below, it is considered that the user Ua feels fresh (feels “cool enough” or “warm enough”). 
     (Control Flow) 
     Referring to  FIG. 8 , in the case where swing intensive blowing is performed, the indoor unit  200  changes swing intensive blowing into distributed blowing in accordance with a change in the surface temperature of the face of the user Ua. The steps other than the above-mentioned feature are the same as those for the indoor unit  100 . Features different from the steps for the indoor unit  100  will be described below. 
     That is, the controller  70  of the indoor unit  200  identifies the location of the user Ua (S 5 ), and controls the attitude of the up/down air flow direction plate  9  and the left/right air flow direction plate  10  so that conditioned air is blown toward the user Ua for a longer period of time and with a larger amount (swing intensive blowing) (S 6 ). 
     While swing intensive blowing toward the user Ua continues, the temperature detection unit detects the temperature of the face of the user Ua (S 21 ). The controller  70  calculates the variation range ΔT of body temperature based on plural values of the detected temperature of the face, and compares the obtained variation range ΔT with the comfortable temperature range ΔTs (S 22 ). 
     When the obtained variation range ΔT reaches the comfortable temperature range ΔTs or below, it is considered that the user Ua feels fresh (feels cool enough or feels warm enough), and air blowing is shifted to distributed blowing (S 10 ). Meanwhile, during the period until the obtained variation range ΔT has exceeded the comfortable temperature range ΔTs, it is considered that the user Ua does not feel fresh (does not feel cool enough or feel warm enough), and swing intensive blowing continues (return to S 5 ). 
     As described above, the temperature of the face is actually detected, and it is determined, based on the detected temperature of the face, whether or not the user Ua feels fresh. Therefore, a more appropriate timing for shifting to distributed blowing can be attained. Thus, comfort is further enhanced. 
     In the above description, shifting to distributed blowing is performed. However, the present invention is not limited to this, and the refrigeration cycle (operation) may be stopped. 
     Next, a supplementary description about the variation range ΔT of body temperature will be provided. The variation range ΔT of body temperature may be the amount of decrease in the surface temperature of a face by intensive blowing at a repetition time (in the example of the first time, ΔT=ΔT 01 =T 0 −T 1 ), the amount of increase in the surface temperature of the face by heat recovery (in the example of the first time, ΔT=ΔT 12 =T 2 −T 1 ), or the average of the amount of decrease in the surface temperature of a face by intensive blowing and the amount of increase in the surface temperature of the face by heat recovery (ΔT=(ΔT 01 +ΔT 12 )/2). Further, the variation range ΔT of body temperature may be the average of the amounts of decreases in the surface temperature of a face by plural intensive blowing times and the amounts of increases in the surface temperature of the face by plural heat recovery times (in the example of the first and second times, ΔT=(ΔT 01 +ΔT 12 +ΔT 23 +ΔT 34 )/4. With the use of the average of the plural amounts of decreases and the plural amounts of increases, a determination in which the influence of variations in the actual surface temperature and temperature detection is suppressed, can be attained. 
     Embodiment 3 
       FIGS. 9 and 10  illustrate an indoor unit of an air-conditioning apparatus according to Embodiment 3 of the present invention.  FIG. 9A  is a front view of the main body,  FIG. 9B  is a front view of a remote controller, and  FIG. 10  is a flowchart for illustrating control steps. The portions that are the same as or equivalent to portions in Embodiment 1 will be referred to with the same signs, and the steps that are the same as or equivalent to steps in Embodiment 1 will be referred to with the same numbers. Description of Embodiment 3 will be partially omitted. These figures are schematically rendered, and the present invention is not limited to the illustrated forms. 
     (Main Body and Remote Controller) 
     Referring to  FIG. 9A , an indoor unit of an air-conditioning apparatus (hereinafter, referred to as an “indoor unit”)  300  has a configuration similar to the indoor unit  100 . 
     Referring to  FIG. 9B , the remote controller  80  provided in the indoor unit  300  includes a sound emitting unit  83  that emits a sound or voice and a sound emission stop button  84  for stopping sound emission by the sound emitting unit  83 . 
     (Control Flow) 
     Referring to  FIG. 10 , the controller  70  of the indoor unit  300  performs the steps described below. First, the imaging device  50  always (for example, for every one second) captures an image of the room  90 , and inputs the captured image to the controller  70  (S 1 ). 
     The controller  70  determines, based on the captured image, whether or not one or more persons are present in the room  90 , and determines whether or not the face of at least one person who is present in the room  90  remains stationarily facing the imaging device  50  for the recognition time J 1  (for example, three seconds) or more (S 2 ). 
     When it is determined that the face of the person remains stationarily facing the imaging device  50  for the recognition time J 1  or more (S 2 ), the person is determined as a person (hereinafter, referred to as a “user Ua”) who wishes to know the location of the remote controller  80 , and the controller  70  controls the main body communication device  60  to send an operation signal toward the remote controller  80  (S 31 ). 
     When the communication unit  85  of the remote controller  80  receives the operation signal, the sound emitting unit  83  is activated and emits a sound (a beep, a chime, etc.) or a voice (for example, “You can find the remote controller here.”) (S 32 ). 
     Such a sound or voice continues to be emitted until the user Ua finds the remote controller  80  and depresses the sound emission stop button  84  (S 33 ). When the sound emission stop button  84  is depressed, the sound emitting unit  83  is stopped (S 34 ). 
     As describe above, even when the user Ua does not know the location of the remote controller  80  (whereabouts), the user Ua is able to learn the location of the remote controller  80  (whereabouts) from the sound or voice emitted from the remote controller  80 . That is, since a particular operation is not required, the user Ua is able to find the remote controller  80  easily and quickly. Thus, convenience is further improved. 
     Furthermore, the above-mentioned series of steps (S 31  to S 34 ) may be applied to the indoor units  100  and  200  (Embodiments 1 and 2) such that in the control flows for the indoor units  100  and  200 , after the step (S 2 ) for determining whether or not the face of a person remains stationarily facing the imaging device  50  for the recognition time J 1  or more, the series of steps (S 31  to S 34 ) may be performed concurrently with the subsequent steps (S 3  to S 7 ). Further, after the step (S 8 ) for determining whether or not there is a person (a person different from the user Ua) whose face remains stationarily facing the imaging device  50  for the recognition time J 1  or more, the series of steps (S 31  to S 34 ) may be performed concurrently with the subsequent steps. 
     Embodiment 4 
       FIGS. 11 and 12  illustrate an indoor unit of an air-conditioning apparatus according to Embodiment 4 of the present invention.  FIG. 11A  is a front view of the main body,  FIG. 11B  is a front view of a remote controller, and  FIG. 12  is a flowchart for illustrating control steps. The portions that are the same as or equivalent to portions in Embodiment 1 will be referred to with the same signs, and the steps that are the same as or equivalent to steps in Embodiment 1 will be referred to with the same numbers. Description of Embodiment 4 will be partially omitted. These figures are schematically rendered, and the present invention is not limited to the illustrated forms. 
     (Main Body and Remote Controller) 
     Referring to  FIG. 11A , an indoor unit of an air-conditioning apparatus (hereinafter, referred to as an “indoor unit”)  400  is configured to allow a person (user) to know the location of the remote controller  80 . The main body  1  includes a main body sound emitting device  63  that is provided on the front side of the main body  1  and beside the main body communication device  60  and that emits a sound (a voice, electronic sound, etc.), and a main body display device  62  that is provided at substantially the center of the front panel  2  and that displays, thereon by emerging, characters, signs, patterns, or the like. Light is projected to the main body display device  62  from inside the main body  1 . However, in the present invention, the form of the main body display device  62  and the way of display are not limited. 
     Referring to  FIG. 11B , the remote controller  80  (see  FIG. 1B ) provided in the indoor unit  100  includes a reporting stop button  86 . 
     (Control Flow) 
     Referring to  FIG. 12 , first, the controller  70  of the indoor unit  400  always (for example, for every one second) determines, based on an image captured by the imaging device  50 , whether or not one or more persons are present in the room  90  (S 1 ), and determines whether or not the face of at least one person who is present in the room  90  remains stationarily facing the imaging device  50  for the recognition time J 1  (for example, three seconds) or more (S 2 ). When the controller  70  determines that the face of the person remains stationarily facing the imaging device  50  for the recognition time J 1  or more (S 2 ), the person is determined as a person (hereinafter, referred to as a “user Ua”) who wishes to know the location of the remote controller  80 , and the controller  70  controls the main body communication device  60  to send a search signal (equal to an operation signal) toward the remote controller  80  (S 41 ). 
     When the communication unit  85  receives the search signal, the remote controller  80  transmits a confirmation signal toward the main body communication device  60  (S 42 ). 
     Meanwhile, when the main body communication device  60  receives the confirmation signal, the controller  70  identifies the location of the remote controller  80 , based on the confirmation signal (S 43 ), and controls the main body sound emitting device  63  and the main body display device  62  to report the identified location of the remote controller  80  (S 44 ). 
     The main body sound emitting device  63  emits a voice, such as a message indicating the identified location of the remote controller  80 , for example, “The remote controller is located on the right hand side at the further end of the room.” (S 45 ), and the main body display device  62  displays a sentence or figure indicating the identified location of the remote controller  80 , for example, a sentence, such as “The remote controller is located on the left hand side near the main body.”, or a figure, such as “an arrow indicating a right direction” (S 46 ). 
     Such a sound or voice continues to be emitted and such a sentence or figure continues to be displayed until the user Ua finds the remote controller  80  and depresses the reporting stop button  86  (S 47 ). When the reporting stop button  86  is depressed, the main body sound emitting device  63  stops emitting a sound (S 48 ), and the main body display device  62  stops display (S 49 ). 
     As described above, with the indoor unit  400 , even when the user Ua does not know the location of the remote controller  80  (whereabouts), the user Ua is able to find the remote controller  80  easily and quickly based on information reported from the main body  1 . Thus, convenience is further improved. 
     In the above description, the main body  1  is provided with both the main body sound emitting device  63  and the main body display device  62 . However, the present invention is not limited to this. Only one of the main body sound emitting device  63  and the main body display device  62  may be provided. 
     Further, by application to the indoor unit  300  (Embodiment 3), the sound emitting unit  83  may be provided on the remote controller  80 . When the search signal (equal to an operation signal) is received, the sound emitting unit  83  may be driven, and when the reporting stop button  86  is depressed, the sound emitting unit  83  may be stopped. Accordingly, the user is able to learn the location of the remote controller  80  (whereabouts) from both the main body  1  and the remote controller  80 . 
     Furthermore, the above-mentioned series of steps (S 41  to S 49 ) may be applied to the indoor units  100  and  200  (Embodiments 1 and 2) such that in the control flows for the indoor units  100  and  200 , after the step (S 2 ) for determining whether or not the face of a person remains stationarily facing the imaging device  50  for the recognition time J 1  or more, the series of steps (S 41  to S 49 ) may be performed concurrently with the subsequent steps (S 3  to S 7 ). Further, after the step (S 8 ) for determining whether or not there is a person (a person different from the user Ua) whose face remains stationarily facing the imaging device  50  for the recognition time J 1  or more, the series of steps (S 41  to S 49 ) may be performed concurrently with the subsequent steps.