Patent Publication Number: US-2023142796-A1

Title: Indoor unit for air conditioner

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the priority benefit of Korean Patent Application No. 10-2018-0046796, filed on Apr. 23, 2018, and 10-2019-0017447, filed on Feb. 14, 2019 in the Korean Intellectual Property Office, the disclosure of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an indoor unit for an air conditioner, and more particularly to a filter installed in the indoor unit. 
     2. Description of the Related Art 
     An indoor unit for an air conditioner may adjust required indoor temperature by discharging air heat-exchanged with a refrigerant to an indoor space. The indoor unit for the air conditioner suctions indoor air through an suction port, make the suctioned air to exchange heat with a refrigerant, and discharge the heat-exchanged air to an discharge port. 
     An indoor unit for the air conditioner may be divided into a ceiling-mounted type, a wall-mounted type, and a standalone type. In a standalone indoor unit, an outlet may be formed at the front side or either side (right or left) of a cabinet, and an suction port may be formed at the rear side of the cabinet. 
     Since the stand-alone indoor unit is disposed with an outlet facing an indoor space, an outlet disposed at the rear side of cabinet is disposed to face a wall surface or an edge of the indoor space. Therefore, even a filter disposed at the suction port to filter foreign substances may be disposed at a rear surface of the cabinet. 
     It is difficult to change an installation position of the stand-alone indoor unit due to size and/or weight of the product or arrangement of a refrigerant tube. Thus, a user should separate or install the filter from the back of the cabinet. This may cause inconvenience to the user due to limitation in a space where the air suction unit is installed. 
     Korean Patent Application Publication No. 10-2017-0076015 discloses a conventional structure in which a suction port is formed in the rear and a filter member disposed at the suction port is mounted to an installation bracket. The structure has the filter member disposed at the rear side where the suction port is formed, and the filter member is inserted into or drawn from a detachment hole formed in a lateral direction of the installation bracket. 
     This structure requires a user to be positioned at a rear side of the indoor unit when inserting the filter member into a case of the indoor unit or drawing the filter member therefrom. In addition, this structure has a limitation in terms of installation in that a separate space is needed to draw the filter member from a side surface of the indoor unit. 
     Multiple types of filters can be installed at a suction port to improve cleanness of an indoor space, remove fine dust, or remove odor. Such filters should be installed or detached at a rear side of a cabinet where the suction port is formed. There is a spatial limitation in forming a suction port, and thus, multiple structures should be coupled to install multiple types of filters, which requires more complicated operations. 
     SUMMARY OF THE INVENTION 
     The present disclosure solves the above-mentioned problems. One object of the present invention is to provide an indoor unit in which a filter is capable of being easily mounted to a suction port formed in rear of the indoor unit. 
     Another object of the present invention is to provide an indoor unit in which a suction port and a filter are installed in different areas. 
     Yet another object of the present invention is to provide an indoor unit in which a plurality of filters is capable of being easily mounted at a suction port formed in rear of the indoor unit. 
     Yet another object of the present invention is to provide an indoor unit in which a plurality of filters are capable of being easily managed and stably mounted. 
     Still yet another object of the present invention is to provide an indoor unit that minimizes a thickness of a filter module mounted in rear of the indoor unit and performing a plurality of filter functions. 
     Objects of the present invention are not limited to the aforementioned objects, and other objects not mentioned in the above may be clearly comprehended to those of ordinary skill in the art to which the embodiment pertains through the following description. 
     To achieve the aforementioned objects, an indoor unit for an air conditioner according to the present invention may be configured such that a suction port is formed on a rear surface, a filter module disposed at the suction port is mounted to a filter mounting member, the position of the filter mounting member is changed by a mobile member, and arrangement of a filter module mounted to the filter mounting member is changed in response to a force applied by a driving device to the mobile member, so that the filter mounting member with the filter module mounted thereto may move to an area other than the suction port. 
     In addition, when a control command is received via a controller to change the position of the filter mounting member, the driving device may be operated to change the position of the filter module, so that the position of the filter module may be moved to an area of the suction port or an area other than the suction port in accordance to a specific signal. 
     The indoor unit for the air conditioner according to the present invention may further include an input unit configured to receive a control command form a user, and, when the input unit receives the control command from the user to change the position of the filter mounting member, the driving device pressing the mobile member, so that the filter module mounting member with the filter module mounted thereto may move to an area other than the suction port in accordance to the control command from the user. 
     The mobile member may position the filter mounting member such that the filter module covers the suction port, or such that a direction of drawing the filter module faces forward. Accordingly, the filter module, disposed at the suction port formed on the rear surface, may be inserted or drawn from an area in front of the cabinet assembly. 
     The filter module may be inserted into or drawn from the filter mounting member in a lateral direction of the filter module, and the filter mounting member may move between a first position and a second position, the first position at which the filter module is positioned at the suction port, and the second position at which the filter module is positioned with the lateral direction of the filter module facing forward. Accordingly, the filter module, disposed at the suction port formed on the rear surface, may be inserted or drawn from an area in front of the cabinet assembly. 
     The mobile member may include: dual links having different length, and rotatably connected to the cabinet assembly and the filter mounting member, respectively; and drive transmission links transferring forces generated by the driving device to the dual links. Accordingly, the filter mounting member, disposed on a rear side of the cabinet assembly, may be moved to a lateral side of the cabinet assembly. 
     The dual links may include: a first link rotatably connected to the cabinet assembly and the filter mounting member, respectively; and a second link spaced apart from the first link and rotatably connected to the cabinet assembly and the filter mounting member, respectively, and a length of the first link may be longer than a length of the second link. Accordingly, the filter mounting member, disposed on a rear side of the cabinet assembly, may be moved to a lateral side of the cabinet assembly. 
     A gap between one end of the first link connected to the filter mounting member and one end of the second link connected to the filter mounting member may be longer than a gap between the other end of the first link connected to the cabinet assembly and the other end of the second link connected to the cabinet assembly. Accordingly, the filter mounting member, disposed on a rear side of the cabinet assembly, may be moved to a lateral side of the cabinet assembly. 
     The second link may be disposed closer to a lateral side of the cabinet assembly than the first link is, and the first link may be disposed closer to the driving device than the second link is. Accordingly, the filter mounting member, disposed on a rear side of the cabinet assembly, may be moved to a lateral side of the cabinet assembly. 
     The drive transmission links may include: a motor link fixedly connected to the driving device; and a bending link having one end rotatably connected to the motor link and the other end rotatably connected to the first link. Accordingly, positions of the dual links may be changed. 
     The bending link may include a bending portion vertically bent between one end and the other end, and the bending portion may be disposed closer to one end of the bending link being connected to the motor link than the other end of the bending link being connected to the first link. Accordingly, the dual links may be moved to an outer side of the cabinet assembly. 
     The filter mounting member may include: a filter module mounting part forming a space where to install the filter module, and being open rearward; and a mobile member fastening part disposed above or below the filter module mounting part, forming a space where the mobile member is disposed, and being open forward. Accordingly, a space where the filter module is disposed may be separated from a space where the mobile member is disposed. 
     The cabinet assembly may further include a rearward protruding member that protrudes rearward, and the filter mounting member is in close contact with the rear protruding member when the filter module is positioned at the suction port. 
     The rearward protruding member includes: a filter module recognition sensor that protrudes in a direction in which the filter mounting member is mounted so that the filter module recognition sensor is pressed by the filter module, and the filter mounting member includes: a filter module recognition hole that is penetrated by the filter module recognition sensor when the filter mounting member is in close contact with the rearward protruding member. Accordingly, it is possible to recognize mounting of the filter module when the filter mounting member with the filter module mounted thereto is disposed at a side of the suction port of the cabinet assembly. 
     The rearward protruding member may include an ionization part having an electrode that ionizes molecules in air flowing into the suction port, and the electrode may be disposed to protrude rearward vertically to a rear surface on which the suction port is formed, so that the air flowing into the suction port are ionized in a large area. 
     The filter module may include: a pre-filter configured to filter large-sized dust in the air flowing into the suction port; a dust collecting filter unit configured to collect air particles, ionized by the ionization part, to filter the air; a deodorization filter unit configured to remove odor from the air flowing into the suction port; and a filter case with the pre-filter being fixed thereto and the dust collecting filter unit and the deodorization filter unit being mounted thereto. Accordingly, a plurality of filters may be disposed while coupled to each other. 
     A power terminal configured to supply a voltage to the dust collecting filter unit, and a ground terminal configured to provide a ground to the dust collecting filter unit may be formed in the rearward protruding member in a direction in which the filter mounting member is mounted. A power terminal hole penetrated by the power terminal in response to the filter mounting member being in close contact with the rearward protruding member, and a ground terminal hole penetrated by the ground terminal in response to the filter mounting member being in close contact with the rearward protruding member may be formed in the filter mounting member. A ground receiving terminal configured to provide a ground to the dust collecting filter unit in response to contact with the ground terminal, and a power receiving terminal configured to supply power to the dust collecting filter unit in response to contact with the power terminal may be formed in the dust collecting filter unit. Accordingly, the dust collecting filter part may be operated when the filter mounting member with the filter module mounted thereto is mounted to the cabinet assembly. 
     Details of other embodiments are included in the following description and the accompanying drawings. 
     According to an indoor unit of an air conditioner of the present invention, there are one or more effects as described below. 
     The above solutions have advantages in that a filter module is capable of being easily mounted and separated because a filter mounting member to be mounted with the filter module and a mobile member for changing a position of the filter mounting member are included. 
     The filter mounting member has a structure to be moved by the mobile member, and thus, there is an advantage in that a user is capable of mounting the filter module to the filter mounting member at a position easily approached because a position of the filter module to be mounted to the filter mounting member and a position of a suction port is disposed are different. 
     The mobile member has dual links having different lengths and spaced apart from each other, and the filter module is disposed to be drawn in a forward direction from an outer side of a cabinet, and thus, there is an advantage in that the filter module is capable of being easily mounted and separated. 
     A plurality of filters is mounted to the filter mounting member disposed to be easily approached by a user, and the filter mounting member is positioned in rear of the suction port, and thus, there is an advantage in that bothersome operation required to mount the plurality of filters is not necessary. 
     The plurality of filters may maintain a state of being coupled to one another with protrusions thereof using magnetic members, and thus, there is an advantage in that the filter module is capable of being managed and used stably. 
     Specifically, as a filter case has a protrusion on one side to fix the plurality of filters, and a magnetic member on the other side to fix the plurality of filters, there is an advantage in that the plurality of filters is capable of being easily coupled to and separated from each other. 
     An electric charge unit for ionizing molecules in air collected by a dust collecting device in the filter member is additionally installed in a cabinet, and an additional electric charge unit is not included in a dust collecting filter unit in the filter module, and thus, there is an advantage in that the filter module has a slim shape. 
     Effects of the present invention may not be limited to the above and other objects and other objects which are not described may be clearly comprehended to those of skill in the art to which the embodiment pertains through the following description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings constitute a part of this specification and illustrate an embodiment of the present disclosure and together with the specification, explain the present disclosure.: 
         FIG.  1 A  is a front perspective view of an indoor unit according to an embodiment of the present invention. 
         FIG.  1 B  is a front perspective view of an indoor unit with a filter assembly moved according to an embodiment of the present invention. 
         FIG.  2    is a rear perspective view of an indoor unit according to an embodiment of the present invention. 
         FIG.  3    is a side cross-sectional view of an indoor unit according to an embodiment of the present invention. 
         FIG.  4    is an exploded perspective view of a cabinet assembly and a door assembly according to an embodiment of the present invention. 
         FIG.  5    is a rear perspective view of an upper cabinet and a filter assembly according to an embodiment of the present invention. 
         FIG.  6    is an exploded perspective view of an upper cabinet and a filter assembly according to an embodiment of the present invention. 
         FIG.  7    is a rear perspective view of an upper cabinet according to an embodiment of the present invention. 
         FIG.  8    is a cross-sectional view cut along line X1-X1′ in  FIG.  5   . 
         FIG.  9    is a bottom view of an upper cabinet according to an embodiment of the present invention. 
         FIG.  10    is a rear perspective view of a filter mounting member according to an embodiment of the present invention. 
         FIG.  11    is a front perspective view of a filter mounting member according to an embodiment of the present invention. 
         FIG.  12    is a rear perspective view of an upper cabinet with a filter mounting member mounted thereto according to an embodiment of the present invention. 
         FIG.  13    is a rear perspective view of a filter module according to an embodiment of the present invention. 
         FIG.  14    is a front exploded perspective view of a filter module according to an embodiment of the present invention. 
         FIG.  15    is a rear exploded perspective view of a filter module according to an embodiment of the present invention. 
         FIG.  16    is a front perspective view of a filter case according to an embodiment of the present invention. 
         FIG.  17    is a front perspective view of  FIG.  16    with a dust collecting filter unit mounted thereto. 
         FIG.  18    is a front perspective view of  FIG.  17    with a deodorization filter unit mounted thereto. 
         FIG.  19    is a cross-sectional view cut along line X2-X2′ in  FIG.  18   . 
         FIG.  20    is a cross-sectional view cut along line Y2-Y2&#39; in  FIG.  18   . 
         FIG.  21    is a cross-sectional view cut along line Z2-Z2′ in  FIG.  18   . 
         FIG.  22    is a rear perspective view of a filter mounting member with a filter module mounted thereto according to an embodiment of the present invention. 
         FIG.  23    is a cross-sectional view cut along line X3-X3′ in  FIG.  22   . 
         FIG.  24    is a cross-sectional view cut along line Y1-Y1&#39; in  FIG.  5   . 
         FIG.  25    is a front perspective view of a mobile member and a guide member according to an embodiment of the present invention. 
         FIG.  26    is a perspective view of a first upper mobile member, a second upper mobile member, and an upper driving device fixing plate according to an embodiment of the present invention. 
         FIG.  27    is a plan view of a first upper mobile member, a second upper mobile member, and an upper driving device fixing plate at a second position P2 according to an embodiment of the present invention. 
         FIG.  28    is a plan view of a first upper mobile member, a second upper mobile member, and an upper driving device fixing plate at a first position P1 according to an embodiment of the present invention. 
         FIG.  29    is a plane view of  FIG.  28    with a driving device removed. 
         FIG.  30    is an exploded perspective view of a structure shown in  FIG.  28   . 
         FIG.  31    is a plan view of a first lower mobile member, a second lower mobile member, and a lower driving device fixing plate according to an embodiment of the present invention. 
         FIG.  32    is a rear view of a first lower mobile member, a second lower mobile member, and a lower driving device fixing plate according to an embodiment of the present invention. 
         FIG.  33    is a plan view of a first guide member and a second guide member according to an embodiment of the present invention. 
         FIG.  34    is a view for explanation of arrangement of a mobile member, a filter mounting member, and a filter module at a first position P1 according to an embodiment of the present invention. 
         FIG.  35    is a view for explanation of arrangement of a mobile member, a filter mounting member, and a filter module at a second position P2 according to an embodiment of the present invention. 
         FIG.  36    is a block diagram of a controller and elements relevant thereto according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Reference will now be made to the exemplary embodiments illustrated in the drawings, and specific language will be used here to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Alterations and further modifications of the inventive features illustrated here, and additional applications of the principles of the inventions as illustrated here, which would occur to a person skilled in the relevant art and having possession of this disclosure, are to be considered within the scope of the invention. 
     As used herein, the terms “first,” “second,” etc. are used only to avoid confusion between components, and do not indicate the sequence or importance of the components. The directions of “upward (U)”, “downward (D)”, “leftward (Le)”, “rightward (Ri)”, “forward (F)”, and “rearward (R)” in drawings are used for convenience of explanation but do not limit the scope of the present invention. Thus, the aforementioned directions may be differently defined. 
     As used herein, various singular forms “a,” “an” and “the” are intended to include various plural forms as well, unless context clearly indicates otherwise. For example, a term “a” or “an” shall mean “one or more,” even though a phrase “one or more” is also used herein. Use of the optional plural “(s),” “(es),” or “(ies)” means that one or more of the indicated feature is present. 
     As used herein, a term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless specified otherwise, or clear from context, “X employs A or B” is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then “X employs A or B” is satisfied under any of the foregoing instances. In addition, features described with respect to certain embodiments may be combined in or with various other embodiments in any permutational or combinatory manner. Different aspects or elements of example embodiments, as disclosed herein, may be combined in a similar manner. 
     Various terminology used herein can imply direct or indirect, full or partial, temporary or permanent, action or inaction. For example, when an element is referred to as being “on,” “connected” or “coupled” to another element, then the element can be directly on, connected or coupled to the other element or intervening elements can be present, including indirect or direct variants. In contrast, when an element is referred to as being “directly connected” or “directly coupled” to another element, there are no intervening elements present. 
     Hereinafter, an indoor unit for an air conditioner according to embodiments of the present invention will be described with reference to the accompanying drawings. 
     First, referring to  FIGS.  1  to  4   , all assembly structures of an air conditioner according to an embodiment will be described schematically, and each assembly structure will be described schematically. 
     Overall Configuration 
     An indoor unit for an air conditioner according to an embodiment may include at least the following structure: a cabinet assembly I defining an external appearance of the indoor unit and having an open front surface, a door assembly II covering the open front surface of the cabinet assembly I, a blower assembly III disposed within the cabinet assembly I to generate airflow; a heat exchange assembly IV exchanging heat of air flowing by the blower assembly III with a refrigerant, a filter assembly VI filtering air introduced into the cabinet assembly I, a filter cleaning assembly VII removing foreign substances existing on one side surface of the filter assembly VI, and a humidifying assembly V discharging humidified air to the outside of the cabinet assembly I. 
     Cabinet Assembly 
     The cabinet assembly I according to the present embodiment may include an upper cabinet  11  having a suction port  1143  formed on a rear surface thereof and forming a space where a heat exchanger  41  is installed, a base unit  12  disposed below the upper cabinet  11  and forming a space where at least some elements of the humidifying assembly V are disposed, a lower cabinet  13  covering the rear side and lateral sides of the base unit  12 , and side discharge members  14   a  and  14   b  disposed between the upper cabinet  11  and the door assembly II and forming a side discharge port  141  through which air is discharged. 
     At a portion where the suction port  1143  is formed on the rear surface of the upper cabinet  11 , the filter assembly VI is mounted. On the open front surface of the upper cabinet  11 , the door assembly II is disposed. The upper cabinet  11  is disposed over the lower cabinet  13  and the base unit  12 . The upper cabinet  11  is disposed behind the door assembly II such that it is covered by the door assembly II. 
     The upper cabinet  11  may form a space where the heat exchanger  41 , and a blowing module  31 ,  32   a ,  32   b , and  32   c  are disposed. Within the upper cabinet  11 , a heat exchanger mounting member (not shown) to which the heat exchanger  41  is mounted, a front blowing module mounting member (not shown) to which the front blowing module  31  is mounted, and a lateral blowing module mounting member (not shown) to which the lateral blowing modules  32   a ,  32   b , and  32   c  are mounted may be disposed. 
     The upper cabinet  11  may be disposed in rear of the side discharge members  14   a  and  14   b  relative to the door assembly II. The upper cabinet  11  may be disposed over the base unit  12 . 
     Detailed configuration and arrangement of the upper cabinet  11  will be described in the following. 
     The base unit  12  may be disposed below the upper cabinet  11 . The base unit  12  may form a space in which elements of the humidifying assembly V, such as a water tank  51 , a heater  52 , etc., are disposed. A power line tension maintaining part (not shown) wound around by a power line (not shown) connected to the filter cleaning assembly VII may be disposed within the base unit  12 . 
     The base unit  12  may be shaped like a box having an open front surface. The lower cabinet  13  and part of the side discharge members  14   a  and  14   b  may be disposed on an outer circumference of the base unit  12 . A power line through-hole which is penetrated by the power line connected to the filter cleaning assembly VII, and a humidifying tube through hole (hot shown) which is penetrated by a humidifying tube  54  the humidifying assembly V may be formed in the base unit  12 . The door assembly II may be disposed on the front surface of the base unit  12 . The upper cabinet  11  may be mounted to an upper side of the base unit  12 . On the upper side of the base unit  12 , an separate support member  121  for supporting a structure disposed on the upper side of the base unit  12  may be further mounted. 
     The base unit  12  and the upper cabinet  11  are disposed vertically and coupled to each other, and the door assembly II is disposed on the front surfaces of the base unit  12   and the upper cabinet  11 . 
     The lower cabinet  13  may cover the lateral surfaces and the rear surface of the base unit  12 . Since the lower cabinet  13  is disposed external to the base unit  12 , the lower cabinet  13  may also function as a reinforcement structure for the base unit  12 . A lower plate (not shown) for limiting downward movement of the filter cleaning assembly VII may be disposed on a rear surface of the lower cabinet  13 . A guide rail  116  for guiding movement of the filter cleaning assembly VII may be disposed on the rear surface of the lower cabinet  13 . A refrigerant tub hole (not shown) penetrated by a refrigerant tube (not shown) of the heat exchange assembly IV may be formed in the rear surface of the lower cabinet  13 . A power line hole (not shown) penetrated by a power line (not shown) supplying power from an external power source may be formed in the rear surface of the lower cabinet  13 . 
     The side discharge members  14   a  and  14   b  may be disposed between the upper cabinet  11  and the door assembly II. The side discharge members  14   a  and  14   b  may be disposed between the lower cabinet  13  and the door assembly II. The side discharge members  14   a  and  14   b  may cover a portion of side surfaces of the indoor unit for the air conditioner. 
     The side discharge port  141  for discharging air flowing by the lateral blowing modules  32   a ,  32   b , and  32   c  described below may be formed on both side surfaces of the side discharge members  14   a  and  14   b . A plurality of vanes  142  guiding a direction of air to be discharged may be disposed at the side discharge port  141 . The plurality of vanes may be integrally formed with the side discharge members  14   a  and  14   b . The plurality of vanes according to the present embodiment may be inclined in a forward direction, enabled to guide air discharged to the outside of the cabinet to flow in the forward direction. 
     Door Assembly 
     The door assembly II may include a door plate  21  covering the front surface of the indoor unit and having a front discharge port  22  at one side thereof, a door moving member (not shown) moving the door plate  21  in a horizontal direction, a discharge port cover  23  opening and closing the front discharge port  22  formed in the door plate  21 , and a cover moving member (not shown) moving the front discharge port cover  23  in a vertical direction. 
     The door moving member according to the present embodiment is capable of moving the door plate  21  in the horizontal direction in the front of the cabinet assembly I. The cover moving member according to the present embodiment may move the discharge port cover  23  to open or close the front discharge port  22  by moving the discharge port cover  23 . The cover moving member may move the discharge port cover  23  in a direction downward of the front discharge port  22 . When the front discharge port  22  is opened by the movement of the discharge port cover  23 , the front blowing module  31  described below may be exposed to an outside. The front blowing module  31  may move in a forward-backward direction of the front discharge port  22  which is open. 
     The door assembly II may further include a display unit  24  to display an operation state of the indoor unit or receive a user’s command, and a camera sensor  25  to sense a condition of an indoor space. For example, the condition of the indoor space may include, among other conditions, a size of the indoor space, the number of people existing in the indoor space, and a position of a person in the indoor space. 
     The display unit  24  according to the present embodiment may be disposed below the front discharge port  22 . The camera sensor  25  according to the present embodiment may be disposed in the upper side of the door plate  21 . 
     Blower Assembly 
     A blower assembly III may include a front blowing module  31  discharging air in a direction forward of the indoor unit, and lateral blowing modules  32   a ,  32   b , or  32   c  discharging air in directions from both side surfaces of the indoor unit. The blowing assembly III according to the present embodiment may include one front blowing module  31  and three lateral blowing modules  32   a ,  32   b , and  32   c . The front blowing module  31  and the lateral blowing modules  32   a ,  32   b , and  32   c  may be disposed in front of the heat exchange assembly IV. 
     The front blowing module  31  may be disposed above the lateral blowing modules  32   a ,  32   b , and  32   c . The front blowing module  31  discharges air toward a front discharge port  22  that is formed in a door plate  21 . 
     The front blowing module  31  according to the present embodiment may be configured such that a direction which the discharge port faces is capable of rotating upward, downward, leftward, rightward, or diagonally. Thus, while the discharge port of the front blowing module  31  is disposed in front of the front discharge port  22 , the front blowing module  31  may adjust an air discharging direction in a manner in which an air discharging portion rotates upward, downward, leftward, rightward, or diagonally. 
     The front blowing module  31  may include a front blowing fan  311 , a front blowing motor  312 , and a front blowing fan housing  313 . The front blowing module  31  according to the present embodiment is a structure of the front blowing fan  311  and the front blowing housing  313 , and air discharged therefrom may reach a far distance forward. 
     The lateral blowing module  32   a ,  32   b , and  32   c  may be disposed below the front blowing module  31 . The lateral blowing module  32   a ,  32   b , and  32   c  according to the present embodiment may be vertically provided in plural. Each of the plurality of the lateral blowing modules  32   a ,  32   b , and  32   c  may discharge air through a side discharge port  141 . The plurality of lateral blowing modules  32   a ,  32   b , and  32   c  may respectively include a lateral blowing fan  321   a ,  321   b , and  321   c , lateral blowing motors  322   a ,  322   b , and  322   c , and lateral blowing guides. 
     The lateral blowing module  32   a ,  32   b , and  32   c  may be disposed in front of the heat exchanger  41 , and discharge heat-exchanged air toward the side discharge port  141 . Air flowing by the lateral blowing module  32   a ,  32   b , and  32   c  may flow along the vanes  142  disposed in the side discharge port  141 . 
     Heat Exchange Assembly 
     A heat exchange assembly IV exchanges heat of indoor air, suctioned into an upper cabinet  11 , with a refrigerant. The heat exchange assembly IV may include a heat exchanger  41  in which the refrigerant to exchange heat with the indoor air flows, and a refrigerant tube (not shown) forming a refrigerant flow path along which the refrigerant is introduced into or exhausted from the heat exchanger  41 . 
     The refrigerant tube may include a refrigerant inflow tube (not shown) in which a refrigerant introduced into the heat exchanger  41  flows, and a refrigerant exhaust tube (not shown) in which a refrigerant exhausted from the heat exchanger  41  flows. 
     The heat exchanger  41  may be disposed at a rear side of a blower assembly III. The heat exchange  41  may be disposed between an suction port  1143  and an discharge port to allowing air flowing in the indoor unit to be heat-exchanged. The heat exchanger  41  may be disposed between a filter assembly VI and the blower assembly III. The heat exchanger  41  may have a length corresponding to a height by which the plurality of lateral blowing modules  32   a ,  32   b , and  32   c  and the front blowing module  31  are disposed vertically. 
     The heat exchanger  41  may be disposed within the upper cabinet  11 . The heat exchanger  41  may be fastened to a heat exchanger mount member  1123  formed in the upper cabinet  11 . 
     Humidifying Assembly 
     A humidifying assembly V may discharge humidified air to the outside of the indoor unit. The humidifying assembly V may include, among other components, a water tank  51  to contain water, a heating unit  52  to receive the water from the water tank  51  and heat the water, a humidifying discharge nozzle  53  in which a humidifying discharge port (not shown) for discharging heated humidified air is formed, and a humidifying flow path  54  to guide humidified air, heated by the heating unit  52 , toward the humidifying discharge nozzle  53 . 
     The water tank  51  and the heating unit  52  may be disposed in an inner space of the base unit  12 . The humidifying discharge nozzle  53 , which is formed at an end portion of the humidifying flow tube  54 , may be disposed at a portion at which a side discharge port  141  is formed. Thus, humidified air discharged along the humidifying discharge port may be discharged to the outside of the indoor unit by lateral blowing modules  32   a ,  32   b , and  32   c  together with air flowing toward the side discharge port  141 . 
     The humidifying flow path  52  may allow humid air, heated by the heating unit  52  disposed within the base unit  12 , to flow toward the humidifying discharge port. The humidifying flow path  54  may connect the heating unit  52 , which is disposed within the base unit  12 , and the humidifying discharge port, which is formed at the side discharge port  141  at a height at which the upper cabinet  11  is positioned. 
     Filter Cleaning Assembly 
     A filter cleaning assembly VII may be movably disposed at a rear side of a filter assembly VI to move dust existing on an outer side of the filter assembly VI. The filter cleaning assembly VII may move vertically (upward and downward) along a guide rail  116  disposed in rear of the upper cabinet  11 . 
     The filter cleaning assembly VII may move vertically (upward and downward) along the guide rail  116 , separate dust existing on the outer side of the filter assembly VI, and suction the separated dust, thereby removing dust existing in filter modules  62   a ,  62   b ,  62   c , and  62   d . 
     The filter cleaning assembly may include, among other components: a filter cleaner  71  moving along the guide rail  116  to remove dust existing in the filter modules  62   a ,  62   b ,  62   c , and  62   d ; and a power supply device (not shown) connected to the filter cleaner  71  via a power line (not shown) to supply power to the filter cleaner  71 . 
     Thus, in the guide rail  116 , there may be formed a guide groove  116   a  where the power line is disposed in an upward and downward direction in which the filter cleaner  71  moves. 
     Hereinafter, the structure of an upper cabinet and the structure of a filter assembly according to the present embodiment will be described with reference to  FIGS.  5  to  35   . 
     Filter Assembly 
     Referring to  FIGS.  5  and  6   , a filter assembly VI according to the present embodiment is movably disposed at a rear side of an upper cabinet  11 . The filter assembly VI may be disposed at the suction port  1143  formed in the rear surface of the upper cabinet  11  and filter indoor air flowing through the suction port  1143 . The filter assembly VI is disposed movably with respect to the upper cabinet  11 . 
     The filter assembly VI according to the present embodiment includes a filter modules  62   a ,  62   b ,  62   c , and  62   d  for removing foreign substances from air suctioned into the suction port  1143 . In the filter assembly VI, the filter modules  62   a ,  62   b ,  62   c , and  62   d  may be disposed at the suction port  1143  or disposed external to side surfaces  112   a  and  112   b  of the upper cabinet  11 . 
     The filter assembly VI may include: the filter modules  62   a ,  62   b ,  62   c , and  62   d  for removing dust contained in airflow; filter mounting members  61   a  and  61   b  to which the filter modules  62   a ,  62   b ,  62   c  modules  62   a ,  62   b ,  62   c , and  62   d  are mounted; and mobile members  631   a ,  631   b ,  632   a , and  632   b  for changing a position of the filter mounting members  61   a  and  61   b . The filter assembly may further include driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ connected to the filter mounting members  61   a  and  61   b  to move the position of the filter mounting members  61   a  and  61   b . The filter assembly VI may further include guide members  64   a  and  64   b  moving in accordance with movement of the mobile members  631   a ,  631   b ,  632   a , and  632   b  and assisting movement of the filter amounting members  61   a  and  61   b . 
     The filter assembly VI may include: a first filter mounting member  61   a  disposed on the left side in rear of the upper cabinet  11 ; and a second filter mounting member  61   b  disposed on the left side in rear of the upper cabinet  11 . The filter assembly VI may include an upper filter module  62   a  and a lower filter module  62   b  disposed in the upward and downward direction with respect to the first filter mounting member  61   a ; and a second upper filter module  62   c  and a second lower filter module  62   d  disposed in the upward and downward direction with respect to the second filter mounting member  61   b . 
     The filter assembly VI may include: first mobile members  631   a  and  631   b  connected to the first filter mounting member  61   a  to move the position of the first filter mounting member  61   a ; and second mobile members  632   a  and  632   b  connected to the second filter mounting member  61   b  to move the position of the second filter mounting member  61   b . The first mobile members  631   a  and  631   b  may move the position of the first filter mounting member  61   a  disposed on a rear left side of the upper cabinet  11 . The second mobile members  632   a  and  632   b  may move the position of the second filter mounting member  61   b  disposed on a rear right side of the upper cabinet  11 . 
     The first mobile members  631   a  and  631   b  may include: a first upper mobile member  631   a  disposed in an upper portion of the upper cabinet  111 , and a first lower mobile member  631   b  disposed in a lower portion of the upper cabinet  11 . The second mobile members  632   a  and  632   b  may include: a second upper mobile member  632   a  disposed in the upper portion of the upper cabinet  11 ; and a second lower mobile member  632   b  disposed in the lower portion of the upper cabinet  11 . 
     The guide members  64   a  and  64   b  may include: a first guide member  64   a  connected to the first filter mounting member  61   a ; and a second guide member  64   b  connected to the second filter mounting member  61   b . The first guide member  64   a  may be disposed between the first upper mobile member  631   a  and the first lower mobile member  631   b  to guide position change by the first filter mounting member  61   a . The second guide member  64   b  may be disposed between the second upper mobile member  632   a  and the second lower mobile member  632   b  to guide position change by the second filter mounting member  61   b . 
     In the filter assembly VI according to the present embodiment, the driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ press the mobile members  631   a   631   b ,  632   a , and  632   b , and the mobile members  631   a ,  631   b ,  632   a , and  632   b  change the position of the filter mounting members  61   a  and  61   b . However, this is merely an example. It is understood that the driving device may be omitted. In this case, the position of the filter mounting members  61   a  and  61   b  may be manually changed by a user. However, a changed position of the filter mounting members  61   a  and  61   b  may be guided by the mobile members  631   a   631   b ,  632   a ,  632   b  connected to both the cabinet assembly I and the filter mounting members  61   a  and  61   b . 
     Cabinet Assembly-Upper Cabinet 
     Referring to  FIGS.  6  to  9 ,  12 , and  24   , an upper cabinet  11  according to the present embodiment has a box shape having an open front surface, and a plurality of suction ports in the rear thereof. A filter assembly VI is disposed in rear of the upper cabinet  11 . The filter assembly is movably disposed in rear of the upper cabinet  11 . 
     The upper cabinet  11  may include: an top part  111  disposed to cover the top; lateral parts  112   a  and  112   b  disposed to cover both side surfaces; a bottom part  113  disposed at the bottom and fastened to a base unit  12 ; and rear parts  114   a  and  114   b  in which the filter assembly VI is movably disposed. 
     The top part  111  may include: a top cover surface  1111  disposed external to the top of the indoor unit; and a top surface  1112  of the filter mounting member mount bases  117   a  and  117   b  covering the top of a mobile member receiving space  612   s  where the upper mobile members  631   a  and  632   a  are received. The top cover surface  1111  may have a shape that is inclined upward from the rear to the front, and a plurality of reinforcing grooves  111   a  concave downward may be formed in the front of the top cover surface  111  in the forward and rearward direction. 
     The bottom part  113  may include a bottom surface  1133  of the filter mounting part mount bases  117   a  and  117   b  that covers the bottom of the mobile member receiving space  612   s  where the lower mobile member  631   b  and  632   b  when the filter mounting members  61   a  and  61   b  are mounted to the upper cabinet  11 . On the bottom surfaces of the filter mounting part mount bases  117   a  and  117   b , there may be formed a link hole  1133  penetrated by vertical link bars  6364   a ′ and  6364   b &#39; of motor links  636   a ′ and  636   b ′ of the lower mobile members  631   b  and  632   b , which will be described in the following. 
     Referring to  FIG.  9   , a first high voltage generator  1131  to supply a voltage to a power terminal  1154  or ground terminal  1155  or to provide a ground, and a second high voltage generator  1132  to apply a high voltage to an ionizing part  1156  may be disposed on a lower side of the bottom part  113 . 
     The rear parts  114   a  and  114   b  may be spaced apart from the rear ends of the upper part  111  and the lower end  113  so as to form a space where the filter assembly VI is disposed. 
     In the rear parts  114   a  and  114   b  of the upper cabinet  11 , the mobile members  631   a ,  631   b ,  632   a , and  632   b  moving the filter mounting parts  61   a  and  61   b  of the filter assembly VI is disposed. In the rear parts  114   a  and  114   b  of the upper cabinet  11 , there are formed the guide members  64   a  and  64   b  moving in accordance with movement of the mobile members  631   a ,  631   b ,  632   a , and  632   b  and assisting movement of the filter mounting members  61   a  and  61   b . The rear parts  114   a  and  114   b  of the upper cabinet  11  may include: a first rear part  114   a  in which the first filter mounting member  61   a ; and a second rear part  114   b  in which the second filter mounting member  61   b . The first rear part  114   a  may be disposed on the rear left side of the upper cabinet  11 , and the second rear part  114   b  may be disposed on the rear right side of the upper cabinet  11 . 
     The mobile member fixing part  1141 , to which the mobile members  631   a   631   b ,  632   a , and  632   b  are fixed, and the guide member fixing parts  1142   a  and  1142   b , to which the guide members  64   a  and  64   b  are fixed, may be formed in each of the first rear part  114   a  and the second rear part  114   b . In each of the first rear part  114   a  and the second rear part  114   b , a plurality of suction ports  1143  may be formed vertically with respect to the guide member fixing parts  1142   a  and  1142   b . 
     The first rear part  114   a  may be divided into a first rear part-upper portion  114   au  on which the first upper filter module  62   a  is disposed, and a first rear part-lower portion  114   ad  on which the lower filter module  62   b  is disposed. Likewise, the second rear part  114   b  may be divided into a second rear part-upper portion  114   bu  on which the second upper filter module  62   c  is disposed, and a second rear part-lower portion  114   bd  on which the second lower filter module  62   d  is disposed. 
     When the filter mounting member  61   a  is disposed in the rear of the first rear part  114   a , the first upper filter module  62   a  is disposed in rear of the first rear part-upper portion  114   au  and the first lower filter module  62   b  is disposed in rear of the first rear part-lower portion  114   ad . 
     When the second filter mounting member  61   b  is disposed in rear of the second rear part  114   b , the second upper filter module  62   c  is disposed in rear of the second rear part-upper portion  114   bu  and the second lower filter module  62   d  is disposed in rear of the second lower part-lower portion  114   bd . 
     The upper cabinet may further include a rearward protruding member  115  disposed in the middle of the rear parts  114   a  and  114   b  and protruding rearward. The upper cabinet  11  may further comprise the rearward protruding member  115  disposed between the first rear part  114   a  and the second rear part  114   b  and protruding rearward. The rearward protruding member  115  may protrude rearward from the middle of the rear parts  114   a  and  114   b . The rearward protruding member  115  may be elongated in the upward and downward direction in rear of the upper cabinet  11 . 
     The rearward protruding member  114  may include: protruding surfaces  1151   a  and  1151   b  which protrude rearward from the rear parts  114   a  and  114   b  to form a surface opposing one side surface of the filter mounting members  61   a  and  61   b ; and a guiderail mounting surface  1152  which forms a surface parallel to the rear parts  114   a  and  114   b  at an end portion of the protruding surfaces  1151   a  and  1151   b , and to which the guiderail  116  is mounted. 
     The rearward protruding member  115  may include a first protruding surface  1151   a  protruding rearward from the first rear part  114   a , and a second protruding surface  1151   b  protruding rearward from the second rear part  114   b . The guiderail mounting surface  1142  may be formed as a surface that connects a rear end of the first rear part  114   a  and a rear end of the second rear surface. 
     The first protruding surface  1151  a and the second protruding surface  1151   b  may be formed vertical to the first rear part  114   a  and the second rear part  114   b , respectively, and the guiderail mounting surface  1152  may be formed vertical to each of the first rear part  114   a  and the second rear part  114   b . 
     The upper cabinet  11  may include the filter mounting part mount bases  117   a  and  117   b  to which the filter mounting members  61   a  and  61   b  are respectively mounted. The filter mounting part mount bases  117   a  and  117   b  may include: the rear parts  114   a  and  114   b  in which the suction ports  1143  are formed; and the protruding surfaces  1151   a  and  1151   b  which are formed in the rear parts  114   a  and  114   b  in a protruding manner. 
     When the filter mounting members  61   a  and  61   b  are mounted to the filter mounting member mount bases  117   a  and  117   b , each of the rear parts  114   a  and  114   b  and the protruding surfaces  1151   a  and  1151   b  may be disposed in contact with surfaces corresponding to the filter mounting members  61   a  and  61   b , or may be disposed to oppose to the surface corresponding to the filter mounting members  61   a  and  61   b . 
     The upper cabinet  11  may include: a first filter mounting member mount  117   a  to which the first filter mounting member  61   a  is mounted; and a second filter mounting member mount  117   b  to which the second filter mounting member  61   b  is mounted. Thus, the first filter mounting member mount  117   a  may include the first rear part  114   a  and the first protruding surface  1151   a , and the second filter mounting member mount  117   b  may include the second rear part  114   b  and the second protruding surface  1151   b . 
     When the filter mounting members  61   a  and  61   b  are mounted to the filter mounting member mount bases  117   a  and  117   b , the filter mounting members  61   a  and  61   b  are disposed such that air flowing toward the suction ports  1143  of the upper cabinet  11  passes through the filter modules  62   a ,  62   b ,  62   c , and  62   d  of the filter mounting members  61   a  and  61   b . Here, the case where the filter mounting members  61   a  and  61   b  are mounted to the filter mounting member mount bases  117   a  and  117   b  or the upper cabinet  11  may refer to a state in which the filter mounting members  61   a  and  61   b  are no longer allowed to move in a forward direction or in a center direction of the upper cabinet  11 . 
     Thus, when the filter mounting members  61   a  and  61   b  are mounted to the filter mounting member mount bases  117   a  and  117   b , the power terminal  1154  installed on the upper cabinet  11 , which will be described later, is brought into contact with a power receiving terminal  6233  of the filter modules  62   a ,  62   b ,  62   c , and  62   d , and the ground terminal  1155  installed on the upper cabinet  11  is brought into contact with a ground receiving terminal  6234  of the filter modules  62   a ,  62   b ,  62   c , and  62   d . 
     In the rearward protruding member  1115 , the guiderail  116  guiding movement of a filter cleaning assembly VII may be mounted. 
     The guiderail  116  may be fastened to the rear of the rearward protruding member  115 . The guide rail  116  may be fastened to a guiderail mounting surface  1152  of the rearward protruding member  115 . A fastening groove  1157  for fastening the guide rail  116  to a separate fastening member (not shown) may be formed in the rearward protruding member  115 . 
     In the guide rail  116 , a guide groove  116   a  in which a power line connected to the filter cleaner  71  is disposed may be formed. In the guide rail  116 , a fastening hole  116   b  to which a separate fastening member is mounted may be formed at a position corresponding to the fastening groove  1157  of the rearward protruding member  115 . In the guide rail  116 , an electrode hole  116   c  in which an electrode  1156   a  protruding from the ionization part  1156  is disposed may be formed. The electrode hole  116   c  may be formed rearward from the rear of the electrode groove  1156   b  of the ionization part  1156 , and an electrode may be positioned after passing through the electrode groove  1156   b  and the electrode hole  116   c . 
     In the rearward protruding member  115 , a filter module recognition sensor  1153  configured to recognize or determine mounting of the filter modules  62   a ,  62   b ,  62   c , and  62   d  may be disposed. 
     In the rearward protruding member  115 , a plurality of filter modules recognition sensors  1153  may be disposed to recognize the plurality of filter modules  62   a ,  62   b ,  62   c , and  63 , respectively. The filter module recognition sensor  1153  may sense whether the filter modules  62   a ,  62   b ,  62   c , and  63  are disposed in rear of the suction port  1143 , which will be described later. 
     The filter module recognition sensor  1153  has a structure of recognizing the presence of the filter modules  62   a ,  62   b ,  62   c , and  62   d  when pressed against by inner portions of the filter modules  62   a ,  62   b ,  62   c , and  62   d . When pressed against by inner portions of the filter modules  62   a ,  62   b ,  62   c , and  62   d , the filter module recognition sensor  1153  may recognize that the filter mounting members  61   a  and  61   b  with the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted thereto are mounted to the filter mounting member mount bases  117   a  and  117   b . 
     In this case, the inner portions of the filter modules  62   a ,  62   b ,  62   c , and  62   d  correspond to surfaces which faces the insertion face  6114  of the filter mounting members  61   a  and  61   b  when the filter modules  62   a ,  62   b ,  62   c , and  62   d  are mounted to the filter mounting members  61   a  and  61   b , and which is a surface most closest to the insertion surface  6114 . In addition, the inner portions of the filter modules  62   a ,  62   b ,  62   c , and  62   d  pressing against the filter module recognition sensor  1153  may correspond to an inner portion of the dust collecting filter unit  623  or an inner portion of the deodorization filter unit  624 . 
     When the filter mounting members  61   a  and  61   b  with the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted thereto are mounted to the filter mounting member mount bases  117   a  and  117   b , the filter module recognition sensor  1153  may recognize the filter modules  62   a ,  62   b ,  62   c , and  62   d  when the filter mounting members  61   a  and  61   b  with the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted thereto are mounted to the filter mounting member mount bases  117   a  and  117   b . 
     The filter module recognition sensor  1153  may include a plurality of filter module recognition sensors  1153  that are respectively disposed on a first protruding surface  151   a  and a second protruding surface  1151   b , which are formed on both side surfaces of the rearward protruding member  115 . The plurality of filter module recognition sensors  1153  may be disposed at positions respectively corresponding to the first upper filter module  62   a , the first lower filter module  62   b , the second upper filter module  62   c , and the second lower filter module  62   d . 
     A power terminal  1154  to supply power to the filter modules  62   a ,  62   b ,  62   c , and  62   d  when the filter mounting members  61   a  and  61   b  are mounted to the rear of the upper cabinet  11 , and a ground terminal  1155  to provide a ground to the filter modules  62   a ,  62   b ,  62   c , and  62   d  are disposed in the rearward protruding member  115 . A plurality of power terminals  1154  to supply power to the filter modules  62   a ,  62   b ,  62   c , and  62   d , respectively, and a plurality of ground terminals  1155  to provide a ground to the filter modules  62   a ,  62   b ,  62   c , and  62   d , respectively, may be disposed in the rearward protruding member  115 . 
     When the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted to the filter mounting members  61   a  and  61   b  are disposed in rear of the suction port  1143 , the power terminal  1154  may be brought into contact with a power receiving terminal  6233 . When the filter mounting members  61   a  and  61   b  with the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted thereto are mounted to the filter mounting member mount bases  117   a  and  117   b , the power terminal  1154  may be brought into contact with the power receiving terminal  6233  of the filter modules  62   a ,  62   b ,  62   c , and  62   d . 
     When the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted to the filter mounting members  61   a  and  61   b  are disposed in rear of the suction port  1143 , the ground terminal  1155  may be brought into contact with a ground receiving terminal  6234 . When the filter mounting members  61   a  and  61   b  with the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted thereto are mounted to the filter mounting member mount bases  117   a  and  117   b , the ground terminal  1155  may be brought into contact with the ground receiving terminal  6234  of the filter modules  62   a ,  62   b ,  62   c , and  62   d . 
     The power terminal  1154  and the ground terminal  1155  may be disposed on the filter mounting member mount bases  117   a  and  117   b . The power terminal  1154  and the ground terminal  1155  may be disposed on the protruding surfaces  1151   a  and  1151   b . The power terminal  1154  may include a plurality of power terminals  1154  and the ground terminal  1155  may include a plurality of ground terminals  1155  that may be disposed on the first protruding surface  1151   a  and the second protruding surfaces  1151   b , respectively. The plurality of power terminals  1154  and the plurality of ground terminals  1155  may be disposed at positions respectively corresponding to the first upper filter module  62   a , the first lower filter module  62   b , the second upper filter module  62   c , and the second lower filter module  62   d . 
     A mounting protrusion  1158  for mounting the filter mounting members  61   a  and  61   b  to a designated or predetermined position in rear of the upper cabinet  11  and maintaining the mounted state may be formed in the rearward protruding member  115 . The mounting protrusion  1158  may be formed in plural at portions where the rear parts  114   a  and  114   b  and the rearward protruding member  115  are in contact. 
     When the filter mounting members  61   a  and  61   b  are mounted to the upper cabinet  11 , the mounting protrusion  1158  may be inserted into a mounting protrusion groove  618  of the filter mounting members  61   a  and  61   b . 
     An ionization part  1156  to ionize molecules in air, flowing into the suction part  1143 , by electric discharge may be disposed in the rearward protruding member  115 . A plurality of ionization parts  1156   a ,  1156   b ,  1156   c , and  1156   d  may be installed in the rearward protruding member  115  in the upward and downward direction. The ionization part  1156  may be disposed between the first rear part  114   a  and the second rear part  114   b  to ionize molecules in air flowing into a plurality of suction ports  1143  formed in the first rear part  114   a  and the second rear part  114   b . 
     The ionization parts  1156   a ,  1156   b ,  1156   c , and  1156   d  may include: a plurality of upper ionization parts  1156   a ,  1156   b , and  1156   c  disposed between the first upper filter module  62   a  and the second upper filter module  62   c ; and a plurality of lower ionization parts  1156   d ,  1156   e , and  1156   f  disposed between the first lower filter module  62   b  and the second lower filter module  62   d . The plurality of upper ionization parts  1156   a ,  1156   b , and  1156   c  are preferably spaced apart from each other at a predetermined interval in the upward and downward direction. The plurality of lower ionization parts  1156   d ,  1156   e , and  1156   f  are preferably spaced apart from each other at a predetermined interval in the upward and downward direction. A distance D1 by which the plurality of upper ionization parts  1156   a ,  1156   b , and  1156   c  are spaced apart from each other may be correspond to a size of the filter modules  62   a ,  62   b ,  62   c , and  62   d  or an intensity of a voltage applied to the electrode  1156   a . This may be applied to the plurality of lower ionization parts  1156   d ,  1156   e , and  1156   f . 
     The ionization part  1156  may include: an electrode  1156   a  to ionize molecules in air by discharging a high voltage; an electrode groove  1156   b  that forms a space where the electrode  1156   a  is disposed; and an installation member to fix the electrode  1156   a  to the electrode groove  1156   b . 
     The electrode  1156   a  may receive a high voltage from a high voltage generator  1132  generating the high voltage, and ionize molecules in air by electric discharge. The electrode  1156   a  may be disposed in a direction vertical to the rear parts  114   a  and  114   b . The electrode groove  1156   b  may form a groove portion concave in the guide rail mounting surface  1152  of the rearward protruding member  115  in the forward direction. At the center of the electrode groove  1156   b , an electrode  1156   a  may be disposed. The electrode groove  1156   b  may have a cylindrical shape forming a predetermined space around the electrode  1156   a . 
     The electrode  1156   a  may be disposed such that a portion thereof is exposed rearward of the electrode groove  1156   b . The electrode  1156   a  may be disposed in the electrode groove  1156   b  of the rearward protruding member  115  and the electrode hole  116   c  of the guide rail  116 . The electrode  1156  may protrude rearward of the electrode groove  1156   b  within a distance so as to not contact a power line disposed in the guide groove  116   a  of the guide rail  116 . A length H1 by which the electrode  1156   a  is exposed rearward of the electrode groove  1156   b  may be less than or equal to a depth H2 of the electrode hole  116   c . 
     Filter Assembly-Filter Mounting Member 
     Hereinafter, a filter mounting member will be described with reference to  FIGS.  6 ,  10  to  12 , and  22  to  23   . A filter Assembly VI may include a plurality of filter mounting members  61   a  and  61   b  according to an embodiment of the invention. 
     Filter mounting members  61   a  and  61   b  may be mounted to filter modules  62   a ,  62   b ,  62   c , and  62   d  on one side, and connected to an upper cabinet  11  via mobile members  631   a   631   b ,  632   a , and  632   b  on the other side. The filter mounting member  61   a   61   b  may change the position of the filter modules  62   a ,  62   b ,  62   c , and  62   d . The filter mounting members  61   a  and  61   b  may include: a first filter mounting member  61   a  disposed on the rear left side of the upper cabinet  11 , and a second filter mounting member  61   b  disposed on the rear right side of the upper cabinet  11 . 
     Each of the first filter mounting member  61   a  and the second filter mounting member  61   b  may include: a plurality of filter module mount  611   a ,  611   b ,  611   c , and  611   d  where which a plurality of filter modules  62   a ,  62   b ,  62   c , and  62   d  are respectively inserted and mounted; and a plurality of mobile member fastener  612   a ,  612   b ,  612   c , and  612   d  to which a plurality of mobile members  631   a ,  631   b ,  632   a , and  632   b  are respectively fastened. Each of the first filter mounting member  61   a  and the second filter mounting member  61   b  may further include a first guide member fastener  613   a  and a second guide member fastener  613   b  respectively fastened to a first guide member  64   a  and a second guide member  64   b . 
     The plurality of filter module mounts  611   a ,  611   b ,  611   c , and  611   d  may be formed on rear surfaces of the filter mounting members  61   a  and  61   b . In this case, a forward direction and a rearward direction may be set with reference to the case where the filter mounting members  61   a  and  61   b  are mounted to the filter mounting member mount bases  117   a  and  117   b . This is merely an example for convenience of explanation, and does not limit the scope of the present invention. 
     Each of the first filter mounting member  61   a  and the second filter mounting member  61   b  may include a plurality of filter module mounts  611   a ,  611   b ,  611   c , and  611   d  to receive the plurality of filter modules  62   a ,  62   b ,  62   c , and  62   d , respectively. 
     The first filter mounting member  61   a  may include: a first upper filter module mount  611   a  where the first filter module  62   a  is inserted and mounted; a first lower filter module mount  611   b  where the first lower filter module  62   b  is inserted and mounted; a first upper mobile member fastener  612   a  to which a first upper mobile member  631   a   disposed above the first upper filter module mount  611   a  is fastened; a first lower mobile member fastener  612   b  to which a first lower mobile member  631   b  disposed below the first lower filter module mount  611   b  is fastened; and a first guide member fastener  613   a  disposed between the first filter module mount  611   a  and the first lower filter module mount  611   b  to be fastened to the first guide member  64   a . 
     The second filter mounting member  61   b  may include: a second upper filter module mount  611   c  where the second filter module  62   c  is inserted and mounted; a second lower filter module mount  611   d  where the second lower filter module  62   d  is inserted and mounted; a second upper mobile member fastener  612   c  to which a second upper mobile member  631   c  disposed above the second upper filter module mount  611   c  is fastened; a second lower mobile member fastener  612   d  to which a second lower mobile member  631   d  disposed below the second lower filter module mount  611   d  is fastened; and a second guide member fastener  613   b  disposed between the second filter module mount  611   c  and the second lower filter module mount  611   c  to be fastened to the second guide member  64   b . 
     Each of the plurality of filter module mounts  611   a ,  611   b ,  611   c , and  611   d  may include: a guide part guiding the filter modules  62   a ,  62   b ,  62   c , and  62   d  to be inserted and drawn; a communication hole surface  6113  on which a communication hole  6113   a  being open in a direction toward a suction port  1143  is formed; and an insertion surface  6114  in which an insertion portion is formed in a direction in which the filter modules  62   a ,  62   b ,  62   c , and  62   d  is inserted. 
     The guide part  6111  and  6112  may be disposed above and below the filter module mount  611   a ,  611   b ,  611   c , and  611   d . The guide part  6111  and  6112  may guide upper ends and lower ends of the filter modules  62   a ,  62   b ,  62   c , and  62   d  being inserted or drawn. The guide part  6111  and  6112  may be disposed above and below the filter module mounts  611   a ,  611   b ,  611   c , and  611   d . The guide part  6111  and  6112  may include: a guide rib  6111  protruding to guide the filter modules  62   a ,  62   b ,  62   c , and  62   d  to be inserted or drawn; and a guide roller  6112  allowing the filter modules  62   a ,  62   b ,  62   c , and  62   d  to be easily inserted or drawn. 
     The guide rib  6111  may protrude downward from an upper surface of the filter module mount  611   a ,  611   b ,  611   c , and  611   d  or may protrude upward from a lower surface of the filter module mount  611   a ,  611   b ,  611   c , and  611   d . The guide rib  6111  may be elongated in a direction in which the filter modules  62   a ,  62   b ,  62   c , and  62   d  are inserted. The guide rib  6111  may be spaced apart from the communication hole surface  6113  by a predetermined distance. Part of the filter modules  62   a ,  62   b ,  62   c , and  62   d  may be inserted into a space between the guide rib  6111  and the communication hole surface  6113 . 
     The guide rib  6111  may include: an upper guide rib  6111  protruding downward from the upper surface of the filter module mount  611   a ,  611   b ,  611   c , and  611   d ; and a lower guide rib  6111  protruding upward from the lower surface of the filter module mount  611   a ,  611   b ,  611   c , and  611   d . 
     An upper guide groove (not shown) may be formed between the upper guide rib  6111  and the communication hole surface  6113 . An upper banding portion  62214   a  and an upper cover rib  62411  of the filter modules  62   a ,  62   b ,  62   c , and  62   d , which will be described later, may be inserted into the upper guide groove. A lower guide groove  6113   b  may be formed between the lower guide rib  6111  and the communication hole surface  6113 . A lower bending portion  62215   a  and a lower cover rib  62412  of the filter module, which will be described later, may be inserted into the lower guide groove  6113   b . 
     The guide roller  6112  may be disposed on the filter mounting members  61   a  and  61   b  so as to come into contact with the upper surfaces and the lower surfaces of the filter modules  62   a ,  62   b ,  62   c , and  62   d . The guide roller  6112  may include: an upper guide roller  6112  is rotatably mounted to upper portions of the filter module mount  611   a ,  611   b ,  611   c , and  611   d  so as to come into contact with upper portions of the filter modules  62   a ,  62   b ,  62   c , and  62   d ; and a lower guide roller  6112  rotatably mounted to lower portions of the filter module mount  611   a ,  611   b ,  611   c , and  611   d  so as to come into contact with lower portions of the filter modules  62   a ,  62   b ,  62   c , and  62   d . 
     The guide rib  6111  may be disposed closer to the communication hole surface  6113  than to the guide roller  6112 . The guide roller  6112  may be disposed at a start portion at which the filter modules  62   a ,  62   b ,  62   c , and  62   d  start to be inserted. 
     A plurality of communication holes  6113   a  allowing the inside of the upper cabinet  11  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  to communicate with each other may be formed in the communication hole surface  6113 . The plurality of communication holes  6113   a  may be formed in a shape corresponding to a plurality of suction ports formed in a rear parts  114   a  and  114   b  of the upper cabinet  11 . The plurality of communication holes  6113   a  may be disposed at positions corresponding to the plurality of suction ports  1143  when the filter mounting members  61   a  and  61   b  are mounted to the filter mounting member mount bases  117   a  and  117   b . 
     A power terminal hole  614   a  may be formed in the filter mount members  61   a  and  61   b  at a portion corresponding to a position of a power terminal  1154 . A ground terminal hole  615  may be formed in the filter mounting members  61   a  and  61   b  at a portion corresponding to a position of a ground terminal  1155 . When the filter mounting members  61   a  and  61   b  are mounted to the upper cabinet  11 , the power terminal  1154  and a power receiving terminal  6233  may be brought into contact with each other via the power terminal hole  614 . When the filter mounting members  61   a  and  61   b  are mounted to the upper cabinet  11 , the ground terminal  1155  and a ground receiving terminal  6234  may be brought into contact with each other via the ground terminal hole  615 . The power terminal hole  614  and the ground terminal hole  615  may be formed in the insertion surface  6114  of the filter mounting members  61   a  and  61   b . 
     A filter module recognition sensor hole  617  may be formed in the filter mounting members  61   a  and  61   b  at a portion corresponding to a filter module recognition sensor  1158  disposed in the upper cabinet  11 . When the filter mounting members  61   a  and  61   b  are mounted to a rear of the upper cabinet  11 , the filter module recognition sensor  1153  may protrude to the outside through the filter module recognition sensor hole  617 . 
     Thus, when the filter mounting members  61   a  and  61   b  with the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted thereto are mounted to the rear of the upper cabinet  11 , inner portions of the filter modules  62   a ,  62   b ,  62   c , and  62   d  may press the filter module recognition sensor  1163  protruding through the filter module recognition sensor hole  617 . In this case, the filter module recognition sensor  1153  may detect that the filter mounting members  61   a  and  61   b  with the filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted thereto is mounted to the rear of the upper cabinet  11 . The filter module recognition sensor hole  617  and the filter mounting members  61   a  and  61   b  may be formed in the insertion surface  6114 . 
     A mounting protrusion groove  618  may be formed in the filter mounting members  61   a  and  61   b  at a portion corresponding to a mounting protrusion  1158 . When the filter mounting members  61   a  and  61   b  are mounted to the rear of the upper cabinet  11 , the mounting protrusion  1158  may be inserted into the mounting protrusion groove  618 , thereby maintaining the position of the filter mounting members  61   a  and  61   b . The mounting protrusion  618  may be formed at a portion where the insertion surface  6114  and the communication hole surface  6113  are in contact with each other. 
     A short circuit protrusion  616  for turning off a short circuit switch  6235  installed at the filer modules  62   a ,  62   b ,  62   c , and  62   d  to prevent a short circuit may be disposed in the filter mounting members  61   a  and  61   b . When the filter modules  62   a ,  62   b ,  62   c , and  62   d  are mounted to the filter mounting members  61   a  and  61   b , the short circuit protrusion  616  presses the short circuit switch  6235  so as to turn off the short circuit switch  6235 . 
     The short circuit protrusion  616  may be disposed at each of the plurality of filter module mounts  611   a ,  611   b ,  611   c , and  611   d , and turn off short circuit switches of a plurality of filter modules  62   a ,  62   b ,  62   c , and  62   d  respectively mounted to the plurality of filter module mounts  611   a ,  611   b ,  611   c , and  611   d . The short circuit protrusion  616  may be disposed on the insertion surface  6114  of the filter mounting member. 
     The mobile member fastener  612   a ,  612   b ,  612   c , and  612   d  may be disposed on front surfaces of the filter mounting members  61   a  and  61   b . A portion of the mobile member  631   a ,  631   b ,  632   a , and  632   b  may be fastened to the mobile member fastener  612   a ,  612   b ,  612   c , and  612   d . The mobile member fastener  612   a ,  612   b ,  612   c , and  612   d  may be disposed above or below the filter module mount  611   a ,  611   b ,  611   c , and  611   d . The mobile member fastener  612   a ,  612   b ,  612   c , and  612   d  may be disposed on the upper sides and the lower sides of the filter mount members  61   a  and  61   b . 
     The mobile member fastener  612   a ,  612   b ,  612   c , and  612   d  may include: a first upper mobile member fastener  612   a  disposed above the first upper filter module mount  611   a  and fastened to the upper mobile member  631   a ; a first lower mobile member fastener  612   b  disposed below the first lower filter module mount  611   b  and fastened to the first lower mobile member  631   b ; a second upper mobile member fastener  612   c  disposed above the second upper filter module mount  611   c  and fastened to the second upper mobile member  632   a ; and a second lower mobile member fastener  612   d  disposed below the second lower filter module mount  611   d  and fastened to the second lower mobile member  632   b . 
     Each of the first upper mobile member fastener  612   a  and the second upper mobile member fastener  612   c  may be open in a forward direction and include: a mobile member receiving space  612   s  which forms a space where the first mobile member  631   a  is disposed when the first filter mounting member  64   a  is mounted to the upper cabinet  11 ; a mobile member fastening surface  6121  to which part of the mobile member  631   a  is coupled; a rearward protruding member opposing surface  6122  which is bent at one side end of the mobile member fastening surface  6121  to extend, and which is disposed to oppose a first protruding surface  1151   a  of the rearward protruding member  115  when the first filter mounting member  61   a  is mounted to the upper cabinet  11 ; an outer cover surface  6123  which is bent at the other side end of the mobile member fastening surface  6121  to extend; and a partition  6124  which separates the mobile member receiving space  612   a  and the first upper filter module mount  611   a . 
     Each of the first lower mobile member fastener  612   a  and the second lower mobile member fastener  612   d  may have elements performing the same functions of the mobile member receiving space  612   s , the mobile member fastening surface  6121 , the rearward protruding member opposing surface  6122 , and the outer cover surface  6123 . However, because each of the first lower mobile member fastener  612   a  and the second lower mobile member fastener  612   d  are disposed below the first lower filter module mount  611   b  and the second lower filter module mount  611   d , a partition (not shown) included in each of the first lower mobile member fastener  612   a  and the second lower mobile member fastener  612   d  may be disposed above the mobile member receiving space  612   s . 
     The mobile member fastener  612   a ,  612   b ,  612   c , and  612   d  may be open in a forward direction, and forms a space where the mobile members  631   a   631   b ,  632   a , and  632   b  are disposed. The mobile member fastener  612   a ,  612   b ,  612   c , and  612   d  includes the mobile member fastening surface  6121  to which part of the mobile members  631   a   631   b ,  632   a , and  632   b  are coupled. The mobile member fastening surface  6121  may be disposed to be brought into contact with an upper cover  62212  or a lower cover  62213  of a filter case  622  when the filter modules  62   a ,  62   b ,  62   c , and  62   d  are mounted to the filter mounting members  61   a  and  61   b . 
     Each of the first guide member fastener  613   a  and the second guide member fastener  613   b  may be disposed between a plurality of filter module mounts  611   a ,  611   b ,  611   c , and  611   d  disposed in upward and downward directions. The first guide member fastener  613   a  may be disposed between the first upper filter module mount  611   a  and the first lower filter module mount  611   b  and coupled to the first guide member  64   a . The second guide member fastener  613   b  may be disposed between the second upper filter module mount  611   c  and the second lower filter module mount  611   d  and fastened to the second guide member  64   b . 
     Each of the first guide member fastener  613   a  and the second guide member fastener  613   b  may be open in a forward direction, and forms a space where the first guide member  62   a  or the second guide member  62   b  is disposed. Each of the first guide member fastener  613   a  and the second guide member fastener  613   b  includes the guide member fastening surface  6131  to which part of the first guide member  62   a  or part of the second guide member  64   b  is fastened. The guide member fastening surface  6131  may be disposed to be brought into contact with the upper cover  62212  or the lower cover  62213  of the filter case  622  when the filter modules  62   a ,  62   b ,  62   c , and  62   d  are coupled to the filter mounting members  61   a  and  61   b . 
     Filter Assembly-Filter Module 
     Hereinafter, a filter module according to an embodiment of the invention will be described with reference to  FIGS.  5 ,  6 , and  13 - 24   . 
     A filter assembly VI may include a plurality of filter modules  62   a ,  62   b ,  62   c , and  62   d . In the following description, a filter module  62  may be applied to all of a first upper filter module  62   a , a first lower filter module  62   b , a second upper filter module  62   c , and a second lower filter module  62   d . In addition, a filter mounting member  61  may be applied to all of a first filter mounting member  61   a  and a second filter mounting member  61   b . 
     Here, the upward, downward, leftward, rightward, forward, and rearward directions are described with reference to the case where the filter module  62  is mounted to the filter mounting member  61  to be disposed in rear of the upper cabinet  11 . In addition, an upward and downward direction is defined as a longitudinal direction of the filter module  62 , a leftward and rightward direction is defined as a lateral direction of the filter module  62 , and a forward and rearward direction is defined as a width direction of the filter module  62 . 
     The filter module  62  is detachably mounted to the filter mounting member. The filter module  62  may filter foreign substances contained air flowing into a suction port  1143 . The filter module  62  according may include: a pre-filter  621  to filter large-sized dust from the air flowing into the suction port  1143 ; a dust collecting filter unit  623  to filter air by collecting air particles ionized by an ionizing unit  1156 ; and a deodorization filter unit  624  to remove odor from the air. 
     The filter module  62  may further include a filter case  622  in which the pre-filter is fixed, and to which the dust collecting filter unit  623  and the deodorization filter unit  624  are mounted. With the dust collecting filter unit  623  and the deodorization filter unit  624  mounted thereto, the filter case  622  may be mounted to the filter mounting member  61 . A plurality of suction holes may be formed in the filter case  622  in a direction in which the pre-filter  621  is mounted, and the pre-filter  621  is disposed at the plurality of suction holes. The filter case  622  may include a vertical rib  62211   a  and a horizontal rib  62211   b  which are arranged between the plurality of suction holes on a surface where the pre-filter  621  is mounted. 
     The vertical rib  62211   a  and the horizontal rib  62211   b  may form a grid shape and reinforce of strength of the filter case. The pre-filter  621  may have a mesh shape to filter large-sized foreign substances from air flowing into the filter module  62 . The size of the mesh may vary depending on design considerations. 
     The filter case  622  may include: a rear cover  6221  disposed at a rear when the filter module  62  is disposed in rear of the upper cabinet  11 ; and a lateral cover  6222  disposed at a side when the filter module  62  is disposed in rear of the upper cabinet  11 . The rear cover  6221  may include: a pre-filter part  62211  to which the pre-filter  621  is mounted; an upper cover  62212  disposed above the pre-filter part  62211  to cover one side of the filter mounting member  61 ; and the lower cover  62213  disposed below the pre-filter part  62211  to cover the other side of the filter mounting member  61 . 
     The filter case  622  may include: an upper fixing plate  62214  to fix an upper end of the dust collecting filter unit  623  when the dust collecting filter unit  623  is mounted to the filter case  622 ; and a lower fixing plate  62215  to fix a lower end of the dust collecting filter unit  623  when the dust collecting filter unit  623  is mounted to the filter case  622 . When the dust collecting filter unit  623  is mounted to the filter case  622 , the dust collecting filter unit  623  may be fixed in the longitudinal direction of the filter module  62 . When the deodorization filter unit  624  is mounted to the filter case  622 , the upper fixing plate  62214  and the lower fixing plate  62215  limits movement of the deodorization filter unit  624  in the longitudinal direction of the filter module  62 . 
     The upper fixing plate  62214  may be disposed between the pre-filter  62211  and the upper cover  62212 . The lower fixing plate  62215  may be disposed between the pre-filter  62211  and the lower cover  62213 . The upper fixing plate  62214  and the lower fixing plate  62215  may protrude toward a space formed by the rear cover  6221  and the lateral cover  6222  to position the dust collecting filter unit  623  and the deodorization filter unit  624 . 
     An upper bending portion  62214   a  may be disposed on the upper fixing plate  62214 , and has a front end to be brought into contact with the deodorization filter unit  624  and bending upward. A lower bending portion  62215   a  may be disposed on the lower fixing plate  62215 , and has a front end to be brought into contact with the deodorization filter unit  624  and bending downward. 
     A roller rib  62214   b  may be disposed on the upper fixing plate  62214  at a portion where the guide roller  6112  of the filter mounting member  61  moves. The roller rib  62214   b  may protrude upward from the upper fixing plate  62214  so that the filter module  62  is brought into contact with the guide roller  6112  when inserted into or drawn from the filter mounting member  61 . When the filter module  62  is mounted to the filter mounting member  61 , a movement limiting protrusion  62214   c  may be disposed on one side of the roller rib  62214   b  to limit movement of the filter module  62  in a direction of drawing the filter module  62 . The movement limiting protrusion  62214   c  protrudes upward further than the roller rib  62214   b . The movement limiting protrusion  62214   c  may be disposed such that, when the filter module  62  is mounted to the filter mounting member  61 , the movement limiting protrusion  62214   c  is brought into contact with the guide roller  6112  in a direction of drawing the filter module  62 . 
     Similarly to the upper fixing plate  62214   a , the lower fixing plate  62215   a  may have a roller rail (not shown) and a movement limiting protrusion (not shown) disposed thereon. 
     The filter case  622  may include: a dust collecting filter fixing protrusion  6223  to fix one side of the dust collecting filter unit  623  when the dust collecting filter unit  623  is mounted to the filter case  622 ; a magnet  6224  to fix the other side of the dust collecting filter unit  623  when the dust collecting filter unit  623  is mounted to the filter case  622 ; and a dual fixing protrusion  6225  to fix both the dust collecting filter unit  623  and the deodorization filter unit  624  when the dust collecting filter unit  623  or the deodorization filter unit  624  is mounted to the filter case  622 . 
     The dust collecting filter fixing protrusion  6223  may be disposed on an upper side and a lower side of the lateral cover  6222 . One side of the dust collecting filter unit  623  may be provided in a space between the pre-filter part  62211  and the dust collecting filter fixing protrusion  6223 . 
     The magnet  6224  may be disposed on one side of the pre-filter part  62211 , and fix the other side of the dust collecting filter unit  623  to the filter case  622  using a magnetic force. In the dust collecting filter unit  623 , a magnet may be disposed at a position corresponding to the magnet  6224  disposed in the pre-filter part  62211 . 
     The dual fixing protrusion  6225  may include two fixing protrusions  6225   a  and  6225   b  spaced apart from the pre-filter part  62211  in the width direction by different distances. The dual fixing protrusion  6225  may include: a first fixing protrusion  6225   a  protruding from the lateral cover  6222  to fix one side of the dust collecting filter unit  623 ; and a second fixing protrusion  6225   b  protruding from the lateral cover  6222  to fix one side of the deodorization filter unit  624 . 
     A distance of the first fixing protrusion  6225   a  from the pre-filter part  62211  in the width direction is less than a distance of the second fixing protrusion  6225   b  from the pre-filter part  62211  in the width direction. The first fixing protrusion  6225   a  and the second fixing protrusion  6225   b  may be connected at an end portion. 
     The dust collecting filter fixing protrusion  6223 , the magnet  6224 , and the dual fixing protrusion  6225  of the filter case  622  prevent the dust collecting filter unit  623  and the deodorization filter unit  624  from moving in the width direction of the filter module  62  when the dust collecting filter unit  623  or the deodorization filter unit  624  is mounted to the filter case  622 . 
     A fixing groove  6227  to prevent movement of the dust collecting filter unit  623  in the lateral direction of the filter module  62  may be formed in the filter case  622 . When the dust collecting filter unit  623  is mounted to the filter case  622 , a rear protrusion  62311  of the dust collecting filter unit  623  may be inserted into the fixing groove  6227 . 
     The filter case  622  may include a handle  6226  disposed on a rear surface of the rear cover  6221 . The handle  6226  may be disposed on a lateral side of the rear of the filter case  622  so as to allow a user to easily draw the filter module  62  from the filter mounting member  61 . 
     The dust collecting filter unit  623  may include: a plurality of electrodes  6232   a  and  6232   b  for generating a magnetic field to collect ionized dust particles; and a dust collecting filter case  6231  forming an external appearance of the dust collecting filter unit  623  and forming an inner space where the plurality of electrodes  6232   a  and  6232   b  is disposed. The electrodes  6232   a  and  6232   b  may be formed in a thin plate The electrodes  6232   a  and  6232   b  may include a high voltage electrode  6232   a  to which a relatively high voltage is applied; and a low voltage electrode  6232   b  to which a low voltage is applied compared to the high voltage electrode  6232   a . A plurality of high voltage electrodes  6232   a  and a plurality of low voltage electrodes  6232   b  may be arranged side by side. The electrodes  6232   a  and  6232   b  are provided in plural to face each other and form a gap therebetween. 
     The dust collecting filter unit  623  may include a power receiving terminal  6233  and a ground receiving terminal  6234  to be respectively brought into contact with the power terminal  1154  and the ground terminal  1155 . The power receiving terminal  6223  may contact the power terminal  1154  to connect power to the dust collecting filter unit  623 . Thus, when the power receiving terminal  6233  is in contact with the power terminal  1154 , a high voltage may be applied to the dust collecting filter unit  623 . 
     The ground receiving terminal  6234  may contact the ground terminal  1155  to provide a ground to the dust collecting filter unit  623 . 
     The power receiving terminal  6233  and the ground receiving terminal  6234  may be disposed on one side of the dust collecting filter case  6231 . The power receiving terminal  6233  and the ground receiving terminal  6234  may be disposed on the same surface of the dust collecting filter case  6231 . The power receiving terminal  6233  and the ground receiving terminal  6234  may be disposed in a direction in which the filter module  62  is inserted to the filter mounting member  61 . 
     The dust collecting filter unit  623  may include the short circuit switch  6235  such that the high voltage electrode  6232   a  and the low voltage electrode  6232   b  are short circuited when the short circuit switch  6235  is turned on, and the high voltage electrode  6232   a  and the low voltage electrode  6232   b  are not short circuited when the short circuit switch  6235  is turned off. The short circuit switch  6235  may be turned off in a state in which the filter module  62  with the dust collecting filter unit  623  mounted thereto is positioned in the filter mounting member  61 , and the short circuit switch  6235  may be turned on in a state in which the filter module  62  with the dust collecting filter unit  623  mounted thereto is separated from the filter mounting member  61 . 
     When the filter module  62  is separated from the filter mounting member  61 , the high voltage electrode  6232   a  and the low voltage electrode  6232   b  may be short circuited, and thus, an electric charge transferred to the dust collecting filter unit  623  may be removed. When the short circuit switch  6235  is released from pressure, the high voltage electrode  6232   a  and the low voltage electrode  6232   b  may be short circuited. 
     When the filter module  62  is inserted and positioned in the filter mounting member  61 , the short circuit between the high voltage electrode  6232   a  and the low voltage electrode  6232   b  may be released, and thus, a charge may be transferred to the dust collecting filter unit  623 , thereby generating a magnetic field. 
     The short circuit switch  6235  may be disposed on one side surface of the dust collecting filter case  6231 . The short circuit switch  6235  may be disposed on the same surface as a surface of the dust collecting filter case  6231  on which the power receiving terminal  6233  and the ground receiving terminal  6234  are disposed. The short circuit switch  6235  may be disposed in a direction in which the filter module  62  is inserted into the filter mounting member  61 . 
     A short circuit protrusion  616  pressing the short circuit switch  6235  when the filter module  62  is inserted and positioned in the filter mounting member  61  may be disposed in the filter mounting member  61 . The short circuit protrusion  616  may protrude in a direction of drawing the filter module  62 . 
     The dust collecting filter case  6231  may include: a dust collecting filter suction port through which air flows toward an inner space where the electrodes  6232   a  and  6232   b  are disposed; and a dust collecting filter discharge port through which air with foreign substances removed therefrom flows. 
     The dust collecting filter case  6231  may include a plurality of fixing protrusions  62311 ,  62312 , and  62313  for fixing a position of the dust collecting filter unit  623  when the dust collecting filter unit  623  is mounted to the filter case  622 . The dust collecting filter case  622  may include: a rear protrusion  62311  inserted into the fixing groove  6227 , formed in the rear cover  6221  of the filter case  622 , when the dust collecting filter unit  623  is mounted to the filter case  622 ; a lateral protrusion  62312  to be brought into contact with the dust collecting filter fixing protrusion  6223  or the first fixing protrusion  6225  a of the dual fixing protrusion  6225  which is formed on the lateral cover  6222  of the filter case  622 ; and a front protrusion  62313  protruding forward of the dust collecting filter case  6231  to be brought into contact with an end portion of the deodorization filter unit  624  disposed in front of the dust collecting filter unit  623 . The front protrusion  62313  may limit movement of the deodorization filter unit  624 , disposed in front of the dust collecting filter unit  623 , in the longitudinal direction of the filter module  62 . 
     The dust collecting filter case  6231  may include a dust collecting filter magnet  61314  to fix the dust collecting filter case  6231  to the filter case  622  using a magnetic force together with the magnet  6224  disposed in the filter case  622 . The dust collecting filter magnet  61314  may generate a magnetic force even in relation to a magnet  6224  of the deodorization filter unit  624  disposed in front of the dust collecting filter unit  623 . 
     The deodorization filter unit  624  may physically and/or chemically remove odor components from air by coating a porous base with a deodorant photocatalyst. The deodorization filter unit  624  may include: a deodorization filter case  6241  forming an external appearance to be mounted to the filter case  622 ; and a deodorization filter  6242  supported by the deodorization filter case  6241 . The deodorization filter  6242  may be formed by coating a base member having air gaps with a deodorant photocatalyst or may be manufactured by forming air gaps in a member having a photocatalytic property. Such a photocatalyst may include active carbon. 
     When the filter mounting member  61  with the filter module  62  mounted thereto is disposed in rear of the upper cabinet  11 , an inner portion of the deodorization filter unit  624  may press a filter module recognition sensor  1153  disposed in the upper cabinet  11 . Accordingly, a protruding structure for pressing the filter module recognition sensor  1153  may be included at the inner portion of the deodorization filter unit  624 . 
     The deodorization filter case  6241  includes: an upper cover rib  62411  covering the upper bending portion  62214   a  of the upper fixing plate  62214  of the filter case  622 ; and a lower cover rib  62412  covering the lower bending portion  62215   a  of the lower fixing plate  62215  of the filter case  622 . The lower cover rib  62412  limits movement of the deodorization filter unit  624  in the upward and downward direction of the filter module  62  when the deodorization filter case  6241  is mounted to the filter case  622 . 
     The deodorization filter case  6241  may further include an outer fixing rib  62413  and  62414  protruding toward the lateral cover  6222  to fix the deodorization filter  6242  to the filter case  622 . The outer fixing rib  62413  and  62414  is disposed on one side surface of the deodorization filter case  6241  opposing the lateral cover  6222 . The outer fixing rib  62413  and  62414  may include: a first outer fixing rib  62413  formed at a front end of the deodorization filter case  6241 ; and a second outer fixing rib  62414  spaced apart from the first outer fixing rib  62413  by a predetermined distance in the width direction of the filter module  62 . When the deodorization filter unit  624  is mounted to the filter case  622 , the first outer fixing rib  62413  and the second outer fixing rib  62414  may be disposed on both sides of the second fixing protrusion  6225   b  of the dual fixing protrusion  6225  to limit movement of the deodorization filter unit  624  in the width direction of the filter module  62 . The first outer fixing rib  62413  may extend from the upper end of the deodorization filter case  6241  to the lower end of the deodorization filter case  6241  in the longitudinal direction. The second outer fixing rib  62414  may be formed on one side of the deodorization filter case  6241  at a position where the second fixing protrusion  6225   b  is formed. 
     The deodorization filter unit  624  may include a deodorization filter unit magnet  62415  that is fixed to the magnet  61314  of the dust collecting filter unit  623  by a magnetic force. The deodorization filter unit magnet  62415  may be disposed inside the deodorization filter case  6241 . The deodorization filter unit magnet  62415  may be disposed inside the deodorization filter case  6241  at a position corresponding to the magnet  61314  of the dust collecting filter unit  623 . 
     The filter module  62  according to the present embodiment may further include an outer cover  625  that covers the exterior of the lateral cover  6222  of the filter case  622 . The outer cover  615  may be mounted to an outer surface of the lateral cover  6222 . 
     Coupling Relation of Filter Module/Coupling Relation Between Filter Module and Filter Mounting Member 
     Hereinafter, a coupling relation of a filter module and a coupling relation between the filter module and a filter mounting member will be described with reference to  FIGS.  19  to  23   . A filter module  62  described hereinafter may be applied to a first upper filter module  62   a , a first lower filter module  62   b , a second upper filter module  62   c , and a second lower filter module  62   d . In addition, a filter mounting member  61  to be coupled to the filter module  62  may be applied to a first filter mounting member  61   a  and a second filter mounting member  61   b . 
     Here, the upward, downward, leftward, rightward, forward, and rearward directions are described with reference to the case where the filter module  62  is mounted to the filter mounting member  61  to be disposed in rear of the upper cabinet  11 . In addition, an upward and downward direction is defined as a longitudinal direction of the filter module  62 , a leftward and rightward direction is defined as a lateral direction of the filter module  62 , and a forward and rearward direction is defined as a width direction of the filter module  62 . 
     The filter module  62  may be mounted to the filter mounting member  61  when coupling of the filter module  62  is completed. When a dust collecting filter unit  623  and a deodorization filter unit  624  are mounted to a filter case  622 , it may be considered that coupling of the filter module  62  is completed. 
     The filter module  62  may be slidably mounted to the filter mounting member  61 . The filter module  62  is slidably mounted to the filter mounting member  61  in a manner in which an upper bending portion  62214   a  of the filter module  62  and an upper cover rib  62411  are inserted into an upper guide groove formed on an upper side of the filter mounting member  61 . The filter module  62  may be slidably mounted to the filter mounting member  61  in a manner in which a lower bending portion  62215   a  of the filter module  62  and a lower cover rib  62412   62  are inserted into a lower guide groove  6113   b  formed on a lower side of the filter mounting member  61 . The filter module  62  may be inserted into the filter mounting member  61  in the width direction of the lateral direction of the filter module  62  to be mounted thereto. 
     When the filter module  62  is being mounted to the filter mounting member  61 , a movement limiting protrusion  62214   c  may be disposed on one side of a guide roller  6112 , thereby limiting movement of the filter module  62 . When the filter module  62  is being mounted to the filter mounting member  61 , the movement limiting protrusion  62214   c  may be disposed on one side of the guide roller  6112  in a direction of drawing the filter module  62 . Accordingly, the movement limiting protrusion  62214   c  may limit movement of the guide roller  6112  in a drawing direction, thereby maintaining a state in which the filter module  62  is mounted to the filter mounting member  61 . 
     When coupling of the filter module  62  is completed, the dust collecting filter unit  623  is disposed between the filter case  622  and the deodorization filter unit  624 . When coupling of the filter module  62  is completed, the upper cover rib  62411  of the deodorization filter unit  624  may be disposed to surround the upper bending portion  62214   a  of the filter case  622 . When coupling of the filter module  62  is completed, the upper cover rib  62411  of the deodorization filter unit  624  may be disposed to surround the top and the front of the upper bending portion  62214   a  of the filter case  622 . Likewise, when coupling of the filter module  62  is completed, the lower cover rib  62412  of the deodorization filter unit  624  may be disposed to surround the lower bending portion  62215   a  of the filter case  622 . 
     When coupling of the filter module  62  is completed, a rear protrusion of the dust collecting filter unit  623  may be inserted into a fixing groove  6227  of the filter case  622 . When coupling of the filter module  62  is completed, a front protrusion  62313  of the dust collecting filter unit  623  may be disposed at an end portion of the deodorization filter unit  624 . When coupling of the filter module  62  is completed, a lateral protrusion  62312  of the dust collecting filter unit  623  may be disposed to be brought into contact with a dust collecting filter fixing protrusion  6223  formed on a lateral cover  6222  of the filter case  622  or a first fixing protrusion  6225   a  of a dual fixing protrusion. 
     When coupling of the filter module  62  is completed, a second fixing protrusion  6225   b  of the dual fixing protrusion  6225  of the filter case  622  may be disposed between a first outer fixing rib  62413  and a second outer fixing rib  62414  of the deodorization filter unit  624 . 
     When the filter module  62  is mounted to the filter mounting member  61 , the upper bending portion  62214   a  of the filter module  62  and the upper cover rib  62411  are inserted into the upper guide groove formed on the upper side of the filter mounting member  61 , and the lower bending portion  62215   a  of the filter module  62  and the lower cover rib  62412   62  are inserted into the lower guide groove  6113   b  formed on the lower side of the filter mounting member  61 . 
     When the filter module  62  is mounted to the filter mounting member  61 , an upper cover  62212  or a lower cover  62213  of the filter case  622  may cover a mobile member fastening surface  6121  or a guide member fastening surface  6131  of the filter mounting member  61 . 
     Filter Assembly-Mobile Member/Guide Member 
     Hereinafter, a mobile member and a guide member according to an embodiment of the invention will be described with reference to  FIGS.  6  and  25  to  33   . 
     Mobile members  631   a ,  631   b ,  632   a , and  632   b  according to the present embodiment may be rotatably connected to a cabinet assembly I and filter mounting members  61   a  and  61   b . The mobile members  631   a ,  631   b ,  632   a , and  632   b  may position filter modules  62   a ,  62   b ,  62   c , and  62   d  mounted to the filter mounting members  61   a  and  61   b  at a suction port  1143 , or position the filter mounting members  61   a  and  61   b  such that a direction of drawing the filter modules  62   a ,  62   b ,  62   c , and  62   d  faces forward. 
     The filter modules  62   a ,  62   b ,  62   c , and  62   d  may be inserted into or drawn from the filter mounting members  61   a  and  61   b  in the lateral direction of the filter modules. Accordingly, the mobile members  631   a ,  631   b ,  632   a , and  632   b  move the filter mounting members  61   a  and  61   b  between a first position P1, at which the filter modules  62   a ,  62   b ,  62   c , and  62   d  are positioned at the suction port  1143 , and a second position P2, at which the filter modules  62   a ,  62   b ,  62   c , and  62   d  are positioned with the lateral direction thereof facing forward. 
     In this case, it is understood that being positioned to face forward may include being positioned vertically in a forward direction, and being positioned to be inclined in a forward direction. 
     A filter assembly VI according may include: first mobile members  631   a  and  631   b  rotatably connected to an upper cabinet  11  and a first filter mounting member  61   a , respectively, to move the position of the first filter mounting member  61   a ; and second mobile members  632   a  and  632   b  rotatably connected to the upper cabinet  11  and a second filter mounting member  61   b , respectively, to move the position of the second filter mounting member  61   b . 
     The filter assembly VI may include: first driving devices  633   a  and  633   a ′ respectively pressing the first mobile members  631   a  and  631   b  to change the position of the first filter mounting member  61   a ; and second driving devices  633   b  and  633   b ′ respectively pressing the second mobile members  632   a  and  632   b  to change the position of the second filter mounting member  61   b . 
     Driving devices may include: upper driving devices  633   a  and  633   b  respectively pressing a first upper mobile member  631   a  and a second upper mobile member  632   a ; and lower driving devices  633   a ′ and  633   b ′ respectively pressing a first lower mobile members  631   b  and a second lower mobile member  632   b . 
     Driving devices may further include a stepping motor that operates electrically. However, this is merely an example - a solenoid valve operating electrically or a cylinder structure may be used. 
     The filter assembly VI may include an upper driving device fixing plate  65  to which the first upper driving device  633   a  and the second upper driving device  633   b  are mounted. The upper driving device fixing plate  65  may have the first upper driving device  633   a  and the second upper driving device  633   b  mounted thereto, and may be fixed to an upper side of the upper cabinet  11 . 
     The filter assembly VI may include a lower driving device fixing plate  66  to which the first lower driving device  633   a ′ and the second lower driving device  633   b ′ are mounted. The lower driving device fixing plate  66  may have the first lower driving device  633   a ′ and the second lower driving device  633   b ′ mounted thereto, and may be fixed to a lower side of the upper cabinet  11 . 
     The first mobile members  631   a  and  631   b  and the second mobile members  632   a  and  632   b  may extend from the center of the indoor unit in the forward and rearward direction, and may be disposed symmetric with reference to a center line C-C′ that divides the indoor unit into left and right sides. 
     The first mobile members  631   a  and  631   b  may include the first upper mobile member  631   a  disposed in an upper portion of the upper cabinet  11 , and the first lower mobile member  631   b  disposed in a lower portion of the upper cabinet  11 . The second mobile members  632   a  and  632   b  may include the second upper mobile member  632   a  disposed in the upper portion of the upper cabinet  11 , and the second lower mobile member  632   b  disposed in the lower portion of the upper cabinet  11 . 
     The first upper mobile member  631   a  and the second upper mobile members  632   a  may have the same configuration, and may be disposed symmetric to each other with reference to the center line C-C′ that extends from the center of the indoor unit in the forward and rearward direction. In addition, the first lower mobile member  631   b  and the second lower mobile members  632   b  may have the same configuration, and may be disposed symmetric to each other with reference to the center line C-C′ that extends from the center of the indoor unit in the forward and rearward direction 
     Hereinafter, the first upper mobile member  631   a  and the second mobile member  632   a  will be described with reference to  FIGS.  26  to  30   . 
     Each of the first upper mobile member  631   a  and the second upper mobile member  632   a  may include: dual links  634   a ,  634   b ,  635   a , and  635   b  having different lengths and rotatably connected to the filter mounting members  61   a  and  61   b ; and drive transmission links  636   a ,  636   b ,  637   a , and  637   b  transferring driving forces of the driving devices  633   a  and  633   b  to the dual links  634   a ,  634   b ,  635   a , and  635   b . The first upper mobile member  631   a  and the second upper mobile member  632   a  may further include: cabinet fixing frames  638   a  and  638   b  fixed to the upper cabinet  11  and rotatably connected to the dual links  634   a ,  634   b ,  635   a , and  635   b ; and filter mounting member connection frames  639   a   and  639   b  fixed to the filter mounting members  61   a  and  61   b  and rotatably connected to the dual links  634   a ,  634   b ,  635   a , and  635   b . 
     Two links included in the dual links  634   a ,  634   b ,  635   a , and  635   b  are rotatably connected to the cabinet fixing frames  638   a  and  638   b  and the filter mounting member connection frames  639   a  and  639   b  Accordingly, if one link rotates, the other link may rotate as well. 
     The dual links  634   a ,  634   b ,  635   a , and  635   b  may include: first links  634   a  and  634   b  rotatably connected to the cabinet fixing frames  638   a  and  638   b  and the filter mounting member connection frames  639   a  and  639   b  and connected to the drive transmission links  636   a ,  636   b ,  637   a , and  637   b ; and second links  635   a  and  635   b  spaced apart from the first links  634   a  and  634   b  and rotatably connected to the cabinet fixing frames  638   a  and  638   b  and the filter mounting member connection frames  639   a  and  639   b . 
     The first links  634   a  and  634   b  have a length that is longer than a length of the second links  635   a  and  635   b . The first links  634   a  and  634   b  are disposed closer to the middle portion of the upper cabinet  11 , by which the upper cabinet  11  is divided into left and right sides, than the second links  635   a  and  635   b  are. 
     The first links  634   a  and  634   b  may include: first connection frame couplers  6341   a  and  6341   b  rotatably connected to the filter mounting member connection frames  639   a  and  639   b ; first fixing frame couplers  6342   a  and  6342   b  rotatably connected to the cabinet fixing frames  638   a  and  638   b ; first link bars  6343   a  and  6343   b  connecting the first connection frame couplers  6341   a  and  6341   b  and the first fixing frame couplers  6342   a  and  6342   b ; and transmission link connection parts  6344   a  and  6344   b  formed in the first link bars  6343   a  and  6343   b  and rotatably connected to the drive transmission links  636   a ,  636   b ,  637   a , and  637   b . 
     The first links  634   a  and  634   b  may be rotatably coupled to the filter mounting member connection frames  639   a  and  639   b  with reference to first link-first hinge shafts  6341   ah  and  6341   bh  that are formed in the first connection frame couplers  6341   a  and  6341   b . The first links  634   a  and  634   b  may be rotatably coupled to the cabinet fixing frames  638   a  and  638   b  with reference to first link-second hinge shafts  6342   ah  and  6342   bh  that are formed in the first fixing frame couplers  6342   a  and  6342   b . 
     The transmission link connection parts  6344   a  and  6344   b  may be disposed adjacent to the first fixing frame couplers  6342   a  and  6342   b . 
     The second links  635   a  and  635   b  may include: second connection frame couplers  6351   a  and  6351   b  rotatably connected to the filter mounting member connection frames  639   a  and  639   b ; second fixing frame couplers  6352   a  and  6352   b  rotatably connected to the cabinet fixing frames  638   a  and  638   b ; and second link bars  6353   a  and  6353   b  connecting the second connection frame couplers  6351   a  and  6351   b  and the second fixing frame couplers  6352   a  and  6352   b . 
     The second links  635   a  and  635   b  may be rotatably coupled to the filter mounting member connection frames  639   a  and  639   b  with reference to second link-first hinge shafts  6351   ah  and  6351   bh  that are formed in the first connection frame couplers  6341   a  and  6341   b . The second links  635   a  and  635   b  may be rotatably coupled to the cabinet fixing frames  638   a  and  638   b  with reference to second link-second hinge shafts  6352   ah  and  6352   bh  that are formed in the second fixing frame couplers  6352   a  and  6352   b . 
     A length of the first links  634   a  and  634   b  is longer than a length of the second links  635   a  and  635   b . The first links  634   a  and  634   b  may be disposed at an inner side relative to the second links  635   a  and  635   b . A gap G1 between the first connection frame couplers  6241  and  6241   b , corresponding to one ends of the first links  634   a  and  634   b , and the second connection frame couplers  6351   a  and  6351   b , corresponding to one ends of the second links  635   a  and  635   b , is greater than a gap G2 between the first fixing frame couplers  6342   a  and  6342   b , corresponding to the other ends of the first links  634   a  and  634   b , and the second fixing frame couplers  6352   a  and  6352   b , corresponding to the other ends of the second links  635   a  and  635   b . 
     Thus, when the first links  634   a  and  634   b  rotates by a predetermined angle in a wide range, the second links  635   a  and  635   b  may rotate by an angle greater than the angle of rotation of the first links  634   a  and  634   b  and in a range narrower than the range of rotation of the first links  634   a  and  634   b . 
     The drive transmission links  636   a ,  636   b ,  637   a , and  637   b  may be connected to the driving devices  633   a  and  633   b  to transfer driving forces of the driving devices  633   a  and  633   b  to the first links  634   a  and  634   b . The drive transmission links  636   a ,  636   b ,  637   a , and  637   b  may include: motor links  636   a  and  636   b  fixedly connected to the driving devices  633   a  and  633   b ; and bending links  637   a  and  637   b  rotatably connected to the motor links  636   a  and  636   b  at one ends and connected to the first links  634   a  and  634   b  at the other ends. 
     The motor links  636  and  636   b  may be fixedly connected to the driving devices  633   a  and  633   b  at one end, and rotatably connected to the bending links  637   a  and  637   b  at the other end. The motor links  636   a  and  636   b  may include: motor fixing parts  6361   a  and  6361   b  fixedly connected to the driving devices  633   a  and  633   b ; bending link connecting parts  6362   a  and  6362   b  rotatably connected to the bending links  637   a  and  637   b ; and motor link bars  6363   a  and  6363   b  connecting the motor fixing parts  6361   a  and  6361   b  and the bending link connecting parts  6362   a  and  6362   b . 
     In the motor fixing parts  6361   a  and  6361   b , polygonal shaped fixing grooves  6361   ah  and  6361   bh  may be formed at a portion to be fastened to the driving devices  633   a  and  633   b . Since the motor links  636   a  and  636   b  is connected to the driving devices  633   a  and  633   b  through the fixing grooves  6361   ah  and  6361   bh , the motor links  636   a  and  636   b   may be fixedly connected to the driving devices  633   a  and  633   b . 
     Since the motor links  636   a  and  636   b  are fixedly connected to the driving devices  633   a  and  633   b  at one end, the motor link bars  6363   a  and  6363   b  rotate on the motor fixing parts  6361   a  and  6361   b  when the driving devices  633   a  and  633   b  are operated. When the driving devices  633   a  and  633   b  are operated, the bending link connecting parts  6362   a  and  6362   b  of the motor links  636   a  and  636   b  rotate with a radius corresponding to the motor link bars  6363   a  and  6363   b . Accordingly, when the driving devices  633   a  and  633   b  are operated, the bending links  637   a  and  637   b  rotatably connected to the bending link connecting parts  6362   a  and  6362   b  move. 
     The bending links  637   a  and  637   b  may have a bent shape of “ ”. The bending links  637   a  and  637   b  include: motor link connecting parts  6371   a  and  6371   b  rotatably connected to the motor links  636   a  and  636   b ; dual link connecting parts  6372   a  and  6372   b  rotatably connected to the first links  634   a  and  634   b  of the dual links  634   a ,  634   b ,  635   a , and  635   b ; and bending link bars  6373   a  and  6373   b  having the bending portions  6374   a  and  6374   b  and connecting the motor link connecting parts  6371   a  and  6371   b  and the dual link connecting parts  6372   a  and  6372   b . The bending portions  6374   a  and  6374   b  may have a vertically bent shape. The bending portions  6374   a  and  6374   b  are disposed closer to the motor link connecting parts  6371   a  and  6371   b  than the dual link connecting parts  6372   a  and  6372   b . In this case, the bending portion having a vertically bent shape may include a shape perfectly vertical or a shape approximately vertical in a range between 80° and 100°. 
     The bending links  637   a  and  637   b  may be rotatably coupled to the motor links  636   a  and  636   b  with reference to bending link-first hinge shafts  6371   ah  and  6371   bh  that are formed in the motor link connecting parts  6371   a  and  6371   b . The bending links  637   a  and  637   b  may be coupled to the first links  634   a  and  634   b  with reference to bending link-second hinge shafts  6372   ah  and  6372   bh  that are formed in the dual link connecting parts  6372   a  and  6372   b . 
     The cabinet fixing frames  638   a  and  638   b  may be fastened to the mobile member fixing part  1141  formed in the rear parts  114   a  and  114   b  of the upper cabinet  11 . The cabinet fixing frames  638   a  and  638   b  may be inserted into the mobile member fixing part  1141  to be fixed to an additional fastening member (not shown). Fastening holes  6381   a  and  6381   b  into which the additional fastening member is inserted may be formed in the cabinet fixing frames  638   a  and  638   b . Since the cabinet fixing frames  638   a  and  638   b  are fixed to the upper cabinet  11 , the cabinet fixing frames  638   a  and  638   b  are prevented from moving even when the driving devices  633   a  and  633   b  are operated. 
     Thus, the position of the first link-second hinge shafts  6342   ah  and  6342   bh  formed between the cabinet fixing frames  638   a  and  638   b  and the first links  634   a  and  634   b  remain fixed even when the driving devices  633   a  and  633   b  are operated. In addition, the position of the second link-second hinge shafts  6352   ah  and  6352   bh  formed between the cabinet fixing frames  638   a  and  638   b  and the second links  635   a  and  635   b  remain fixed even when the driving devices  633   a  and  633   b  are operated. 
     The cabinet fixing frames  638   a  and  638   b  may be rotatably connected to the dual links  634   a ,  634   b ,  635   a , and  635   b . The cabinet fixing frames  638   a  and  638   b  may be rotatably connected to the first links  634   a  and  634   b , and rotatably connected to the second links  635   a  and  635   b . The cabinet fixing frames  638   a  and  638   b  may be disposed on an outer side of the rear parts  114   a  and  114   b  of the upper cabinet  11 . In this case, the outer side may indicate a direction distal from the center line. When the filter mounting members  61   a  and  61   b  are disposed in rear of the upper cabinet  11 , the cabinet fixing frames  638   a  and  638   b  may be disposed at a distance far from the center line than the filter mounting member connection frames  639   a  and  639   b . 
     The filter mounting member connection frames  639   a  and  639   b  may be fastened to the mobile member fastener  611   a  and  611   c  of the filter mounting members  61   a  and  61   b . The filter mounting member connection frames  639   a  and  639   b  may be fixed to the filter mounting members  61   a  and  61   b  and rotatably connected to the dual links  634   a ,  634   b ,  635   a , and  635   b . Thus, when the dual links  634   a ,  634   b ,  635   a , and  635   b  move, the filter mounting member connection frames  639   a  and  639   b  may move the filter mounting members  61   a  and  61   b . 
     The filter mounting member connection frames  639   a  and  639   b  may include filter mounting member fasteners  6391   a  and  6391   b  that are fastened to the filter mounting members  61   a  and  61   b . The filter mounting member fasteners  6391   a  and  6391   b  may be formed on both ends of the filter mounting member connection frames  639   a  and  639   b , and connected to the filter mounting members  61   a  and  61   b  via an separate fastening member (not shown). 
     The position of the first link-first hinge shafts  6341   ah  and  6341   bh  formed between the filter mounting member connection frames  639   a  and  639   b  and the first links  634   a  and  634   b  changes when the driving devices  633   a  and  633   b  are operated. In addition, the position of the second link-first hinge shafts  6351   ah  and  6351   bh  formed between the filter mounting member connection frames  639   a  and  639   b  and the second links  635   a  and  635   b  changes when the driving devices  633   a  and  633   b  are operated. 
     The position of the filter mounting member connection frames  639   a  and  639   b  may change in response to change in position of the first link-first hinge shafts  6341   ah  and  6341   bh  and the second link-first hinge shafts  6351   ah  and  6351   bh . 
     The filter mounting member connection frames  639   a  and  639   b  may be rotatably connected to the dual links  634   a ,  634   b ,  635   a , and  635   b . The filter mounting member connection frames  639   a  and  639   b  may be rotatably connected to the first links  634   a  and  634   b , and rotatably connected to the second links  635   a  and  635   b . When the filter mounting members  61   a  and  61   b  are disposed in rear of the upper cabinet  11 , the filter mounting member connection frames  639   a  and  639   b  may be disposed at a distance closer to the center line than the cabinet fixing frames  638   a  and  638   b . 
     Hereinafter, the first lower mobile member  631   b  and the second lower mobile member  632  will be described primarily about difference from the first upper mobile member  631   a  and the second upper mobile member  632   a , with reference to  FIGS.  31  and  32   . 
     Each of the first lower mobile member  631   b  and the second lower mobile member  632   b  may include: dual links  634   a ′,  634   b ′,  635   a ′, and  635   b ′ having different lengths and rotatably connected to the upper cabinet  11  and the filter mounting members  61   a  and  61   b ; drive transmission links  636   a ′,  636   b ′,  637   a ′, and  637   b ′ transferring rotational forces of driving devices  633   a ′ and  633   b ′ to the dual links  634   a ′,  634   b ′,  635   a ′, and  635   b ′; cabinet fixing frames  638   a ′ and  638   b ′ fixed to the upper cabinet  11  and rotatably connected to the dual links  634   a ′,  634   b ′,  635   a ′, and  635   b ′; and filter mounting member connection frames  639   a ′ and  639   b ′ fixed to the filter mounting members  61   a  and  61   b  and rotatably connected to the dual links  634   a ′,  634   b ′,  635   a ′, and  635   b ′. 
     The dual links  634   a ′,  634   b ′,  635   a ′, and  635   b ′ may include: first links  634   a ′ and  634   b ′ rotatably connected to the cabinet fixing frames  638   a ′ and  638   b ′ and the filter mounting member connection frames  639   a ′ and  639   b ′ and connected to the drive transmission links  636   a ′,  636   b ′,  637   a ′ and  637   b ′; and a second links  635   a ′ and  635   b ′ spaced apart from the first links  634   a ′ and  634   b ′ and rotatably connected to the cabinet fixing frames  638   a ′ and  638   b ′ and the filter mounting member connection frames  639   a ′ and  639   b ′. 
     The first links  634   a ′ and  634   b ′ may be rotatably coupled to the filter mounting member connection frames  639   a ′ and  639   b ′ with reference to first link-first hinge shafts  6341   ah ′ and  6341   bh ′, and may be rotatably connected to the cabinet fixing frames  638   a ′ and  638   b ′ with reference to first link-second hinge shafts  6342   ah ′ and  6342   bh ′. The second links  635   a ′ and  635   b ′ may be rotatably coupled to the filter mounting member connection frames  639   a ′ and  639   b ′ with reference to second link-first hinge shafts  6351   ah ′ and  6351   bh ′, and may be rotatably coupled to the cabinet fixing frames  638   a ′ and  638   b ′ with reference to second link-second hinge shafts  6352   ah ′ and  6352   bh ′. 
     The drive transmission links  636   a ′,  636   b ′,  637   a ′ and  637   b ′ may include: a motor links  636   a ′ and  636   b ′ fixedly connected to the driving devices  633   a ′ and  633   b ′; and a bending links  637   a ′ and  637   b ′ rotatably connected to the motor links  636   a ′ and  636   b ′ at one end and connected to the first links  634   a ′ and  634   b ′ at the other end. 
     The bending links  637   a  and  637   b  may be rotatably coupled to the motor links  636   a ′ and  636   b ′ with reference to bending link-first hinge shafts  6371   ah ′ and  6371   bh ′, and may be rotatably connected to the first links  634   a ′ and  634   b ′ with reference to bending link-second hinge shafts  6372   ah ′ and  6372   bh ′. 
     The motor links  636   a ′ and  636   b ′ may include: a motor fixing parts  6361   a  ‘and  6361   b &#39; fixedly connected to the driving devices  633   a &#39; and  633   b &#39;; bending link connecting parts  6362   a &#39; and  6362   b &#39; rotatably connected to the bending links  637   a &#39; and  637   b &#39;; motor link bars  6363   a &#39; and  6363   b &#39; connecting the motor fixing parts  6361   a &#39; and  6361   b &#39; and the bending link connecting parts  6362   a &#39; and  6362   b &#39;; and vertical link bars  6364   a &#39; and  6364   b &#39; extending vertically from the motor fixing parts  6361   a &#39; and  6361   b &#39; that are formed at end portions of the motor link bars  6363   a &#39; and  6363   b &#39;. 
     The vertical link bars  6364   a ′ and  6364   b ′ may transfer rotational forces generated by the driving devices  633   a ′ and  633   b ′ to the motor fixing parts  6361   a ′ and  6361   b ′ to rotate the motor link bars  6363   a ′ and  6363   b ′ in a clockwise direction or a counterclockwise direction. In consideration of the lower structure of the upper cabinet  11  and arrangement of the driving devices  633   a ′ and  633   b ′, the shape of the vertical link bars  6364   a ′ and  6364   b ′ may be elongated downward. The vertical link bars  6364   a ′ and  6364   b ′ may be elongated along a rotational axis of the motor links  636   a ′ and  636   b ′. 
     The lower driving device fixing plate  66  may include a motor fixing part support member  661  that supports the vertical link bars  6364   a ′ and  6364   b ′. The motor fixing part support member  661  may form a space where the vertical link bars  6364   a ′ and  6364   b ′ are rotatably positioned. 
     Hereinafter, the first guide member  64   a  and the second guide member  64   b  will be described primarily about difference from the first upper mobile member  631   a  and the second upper mobile member  632   a , with reference to  FIG.  33   . 
     The filter assembly VI may further include a guide members  64   a  and  64   b  that support movement of the filter mounting members  61   a  and  61   b . The filter assembly VI may include a first guide member  64   a  connected to the first filter mounting member  61   a , and a second guide member  64   b  connected to the second filter mounting member  61   b . 
     The first guide member  64   a  may be fastened to a first guide member fastener  613   a ″ of the first filter mounting member  61   a , and to a first guide member fixing part  1142   a  of the upper cabinet  11 . The second guide member  64   b  may be fastened to a second guide member fastener  613   b ″ of the second filter mounting member  61   b , and to a second guide member fixing part  1142   b  of the upper cabinet  11 . 
     The first guide member  64   a  may support the weight of the first filter mounting member  61   a  and the first filter module  62   a  and  62   b . The second guide member  64   b  may support the weight of the second filter mounting member  61   b  and the second filter module  62   c  and  62   d . 
     The first guide member  64   a  and the second guide member  64   b  may include: dual links  634   a ″,  634   b ″,  635   a ″, and  635   b ″ having different lengths and rotatably connected to the upper cabinet  11  and the filter mounting members  61   a  and  61   b ; cabinet fixing frames  638   a ″ and  638   b ″ connected to the upper cabinet  11  and rotatably connected to the upper cabinet  11  and rotatably connected to the dual links  634   a ″,  634   b ″,  635   a ″, and  635   b ″; and filter mounting member connection frames  639   a ″ and  639   b ″ fixed to the filter mounting members  61   a  and  61   b  and rotatably connected to the dual links  634   a ″,  634   b ″,  635   a ″, and  635   b ″. 
     The dual links  634   a ″,  634   b ″,  635   a ″, and  635   b ″ may include: first links  634   a ″ and  634   b ″ rotatably connected to the cabinet fixing frames  638   a ″ and  638   b ″ and the filter mounting member connection frames  639   a ″ and  639   b ″; and second links  635   a ″ and  635   b ″ spaced apart from the first links  634   a ″ and  634   b ″ and rotatably connected to the cabinet fixing frames  638   a ″ and  638   b ″ and the filter mounting member connection frames  639   a ″ and  639   b ″. 
     The first links  634   a ″ and  634   b ″ may be rotatably coupled to the filter mounting member connection frames  639   a ″ and  639   b ″ with reference to first link-first hinge shafts  6341   ah ″ and  6341   bh ″, and rotatably coupled to the cabinet fixing frames  638   a ″ and  638   b ″ with reference to first link-second hinge shafts  6342   ah ″ and  6342   bh ″. The second links  635   a ″ and  635   b ″ are rotatably coupled to the filter mounting member connection frames  639   a ″ and  639   b ″ with reference to second link-first hinge shafts  6351   ah ″ and  6351   bh ″, and rotatably coupled to the cabinet fixing frames  638   a ″ and  638   b ″ with reference to second link-second hinge shafts  6352   ah ″ and  6352   bh ″. 
     Each of the first guide member  64   a  and the second guide member  64   b  does not include a separate driving device and a drive transmission link. 
     Movement of Mobile Member/Movement of Filter Mounting Member 
     Hereinafter, with reference to  FIGS.  27 ,  28 ,  34 , and  35   , arrangement of the filter mounting members  61   a  and  61   b  upon movement thereof by the first mobile members  631   a ,  631   b  and the second mobile members  632   a  and  632   b , and arrangement of the mobile members will be described according to an embodiment of the invention. 
     The filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  may change in position in relation to the upper cabinet  11  by the first mobile members  631  and  631   b  and the second mobile members  632   a  and  632   b . By the first mobile members  631  and  631   b  and the second mobile members  632   a  and  632   b , the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  may be positioned at a first position P1 in rear of the upper cabinet  11  or at a second position P2 lateral to the upper cabinet  11 . 
       FIGS.  27 ,  28 ,  34 , and  35    will be described with reference to movement of the first filter mounting member  61   a  and the second filter mounting member  61   b  in accordance with movement of the first upper mobile member  631   a  and the second upper mobile member  632   a . When the first upper mobile member  631   a  moves, the first lower mobile member  631   b  and the dual links  634   a ,  634   b ,  635   a , and  635   b  of the first guide member  64   a  may make the same movement. When the second upper mobile member  632   a  moves, the second lower mobile member  632   b  and the dual links  634   a ,  634   b ,  635   a , and  635   b  of the second guide member  64   b  may make the same movement. 
     When the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the first position P1, the filter mounting members  61   a  and  61   b  are mounted to the upper cabinet  11 . When the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the first position P1, air suctioned into the suction port  1143  may pass through the filter modules  62   a ,  62   b ,  62   c , and  62   d . 
     When the filter mounting members  61   a  and  61   b  are placed at the first position P1, the filter mounting member connection frames  639   a  and  639   b  and the cabinet fixing frames  638   a  and  638   b  may be arranged in parallel with each other. When the filter mounting members  61   a  and  61   b  are placed at the first position P1, an angle 01 formed by a virtual horizontal line H-H′, which passes points rotatably connected to the first links  634   a  and  634   b  and points rotatably connected to the second links  635   a  and  635   b  in the cabinet fixing frames  638   a  and  638   b , and a straight line, which connects the first link-first hinge shafts  6341   ah ,  6341   bh  and the first link-second hinge shafts  6342   ah  and  6342   bh  of the first links  634   a  and  634   b , (hereinafter, the angle is referred to as an “angle between the horizontal line H-H′ and the first links  634   a  and 634b”) corresponds to an acute angle. When the filter mounting members  61   a  and  61   b  are placed at the first position P1, an angle 02 formed by the virtual horizontal line and a straight line, which passes the second link-first hinge shafts  6351   ah  and  6351   bh  and the second link-second hinge shafts  6352   ah  and  6352   bh  of the second links  635   a  and  635   b , (hereinafter, the angle is referred to as an “angle between the horizontal line H-H′ and the second links  635   a  and  635   b ) corresponds to an acute angle. 
     When the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the second position, the filter mounting members  61   a  and  61   b  are released from the upper cabinet  11 . When the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the second position, a user may draw the filter modules  62   a ,  62   b ,  62   c , and  62   d  from the filter mounting members  61   a  and  61   b  or may mount the filter modules  62   a ,  62   b ,  62   c , and  62   d  to the filter mounting members  61   a  and  61   b . 
     When the filter mounting members  61   a  and  61   b  are placed at the second position P2, the filter mounting member connection frames  639   a  and  639   b  and the cabinet fixing frames  638   a  and  638   b  may be disposed to be inclined with respect to each other. When the filter mounting members  61   a  and  61   b  are placed at the second position P2, an angle 01′ between the virtual horizontal line H-H′ and the first links  634   a  and  634   b  corresponds to an obtuse angle. When the filter mounting members  61   a  and  61   b  are placed at the second position P2, an angle 02′ between the virtual horizontal line H-H′ and the second links  635   a  and  635   b  corresponds to an approximate straight angle. 
     When the filter mounting members  61   a  and  61   b  move from the first position P1 to the second position P2, a variation Δ02 of the angle formed by the virtual horizontal line and the second links  635   a  and  635   b  is greater than a variation of Δ01 of the angle formed by the virtual horizontal line and the first links  634   a  and  634   b . 
     When the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the second position, the lateral cover  6222  of the filter modules  62   a ,  62   b ,  62   c , and  62   d  is disposed to face forward. When the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the second position, the filter modules  62   a ,  62   b ,  62   c , and  62   d  are disposed on an outer side of the lateral parts  112   a  and  112   b  of the upper cabinet  11 . When the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the second position, the filter mounting member connection frames  639   a  and  639   b  are disposed on outer sides of the lateral parts  112   a  and  112   b  of the upper cabinet  11 . Thus, when the filter mounting members  61   a  and  61   b  and the filter modules  62   a ,  62   b ,  62   c , and  62   d  are placed at the second position, the filter modules  62   a ,  62   b ,  62   c , and  62   d  may be disposed to be separated in a forward direction along the lateral parts  112   a  and  112   b  of the upper cabinet  11 . 
     Regarding Controller 
     Hereinafter, with reference to  FIG.  36   , a controller of an indoor unit for an air conditioner according to an embodiment of the present invention will be described. 
     An indoor unit for an air conditioner according to the present embodiment may include: an input unit  810  configured to receive a control command (e.g., from a user); a sensor unit  820  configured to receive a variety of information relating to the air conditioner; and a controller  800  configured to control overall operations of the air conditioner. 
     The controller  800  may control operations of a door assembly II, a blow fan assembly III, a heat exchange assembly IV, a humidifying assembly V, a filter assembly VI, and a filter cleaning assembly VII. 
     Specifically, the controller  800  may control operation of a door moving member such that a door plate  21  moves to the left or to the right, or may move a cover moving member such that a front discharge port cover  23  opens or closes a front discharge port  22 . The controller  800  may control operation of a front blow motor  312  rotating a front blow fan  311 , or may control operation of lateral blow motors  322   a ,  322   b , and  322   c  rotating lateral blow fans  321   a ,  321   b , and  321   c . 
     The controller  800  may control operation of an expansion valve (not shown) that adjusts an amount or pressure of refrigerant flowing into a heat exchanger. The controller  800  may control operation of a heating unit  52  that receives water from a water tank  52  and heats the water. The controller  800  may control operation of a filter cleaner  71  that moves along a guide rail  116 . 
     The controller  800  may control operation of driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ that press mobile members  631   a ,  631   b ,  632   a , and  632   b . When a control command is received to change positions of the filter mounting members  61   a  and  61   b , the controller  800  may control operation of the driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ that press the mobile members  631   a ,  631   b ,  632   a , and  632   b . 
     When the input unit  810  receives a control command to change the positions of the filter mounting members  61   a  and  61   b , the controller  800  may control operation of the driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ that press the mobile members  631   a ,  631   b ,  632   a , and  632   b . When the input unit  810  receives from a user a control command to change the positions of the filter mounting members  61   a  and  61   b , the input unit  810  transmits a control command to the controller to change the positions of the filter mounting members  61   a  and  61   b . When the controller  800  receives from the input unit  810  the control signal to change the positions of the filter mounting members  61   a  and  61   b , the controller may control operation of the driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ that press the mobile members  631   a ,  631   b ,  632   a , and  632   b . 
     The input unit  810  according to an embodiment of the present invention may include a press or touch button device configured to receive a control command in response to pressure by the user; a touch sensor configured to receive a control command based on the user’s touch; a microphone sensor configured to receive a control command based on the user’s voice; or a camera sensor configured to receive a control command in response to detection of the user’s motion. When the controller  800  receives from the sensor unit  820  a control command to change the positions of the filter mounting members  61   a  and  61   b , the controller  800  may control operation of the driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ that press the mobile members  631   a ,  631   b ,  632   a , and  632   b . 
     The sensor unit  820  may include a filter module detection sensor (not shown) configured to detect an amount of dust contained in the filter modules  62   a ,  62   b ,  62   c , and  62   d . According to one embodiment, the filter module detection sensor may include one or more light emitting device and one or more light receiving devices, and may measure an amount of dust stuck in a filter module based on an amount of reflected light which corresponds to a light which is output from a light emitting device, reflected by a floor, and received by a light receiving device. According to another embodiment, the filter module detection sensor may be a sensor that is disposed in the filter modules  62   a ,  62   b ,  62   c , or  62   d  to measure an air velocity. Accordingly, the filter module detection sensor may detect an amount of dust stuck in the filter modules  62   a ,  62   b ,  62   c , and  62   d  by determining a velocity of air having passed the filter modules  62   a ,  62   b ,  62   c , and  62   d . 
     When it is determined that an amount of dust stuck in the filter modules  62   a ,  62   b ,  62   c , and  62   d  is equal to or greater than a threshold, the sensor unit  820  may transmit a control signal to the controller  800  to change the positions of the filter mounting members  61   a  and  61   b . When the controller  800  receives from the sensor unit  820  the control signal to change the positions of the filter mounting members  61   a  and  61   b , the controller  800  may control operation of the driving devices  633   a ,  633   b ,  633   a ′, and  633   b ′ that press the mobile members  631   a ,  631   b ,  632   a , and  632   b . 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the subject matter and scope of the present invention.