Abstract:
There is disclosed a plasma enhanced chemical vapor deposition apparatus including a pallet to load and convey an object thereon to provide a functional film to the object by plasma reaction, wherein the pallet includes a base, a jig to fix the object, and a fixing part disposed on the base at an upper side of the fixing part Lo fix the object to the pallet.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority under 35 U.S.C. §119 from Korean Application No. 10-2011-0026857 filed on Mar. 25, 2011, Korean Application No. 10-2011-0140040 filed on Dec. 22, 2011 and Korean Application No. 10-2011-0141590 filed on Dec. 23, 2011, the subject matter of which is incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
       [0002]    Embodiments of the invention relate to a plasma enhanced chemical vapor deposition apparatus, and more particularly, to an apparatus for providing a functional film with corrosion resistance, hydrophilicity and antibiotic functions, and a method for controlling the apparatus. 
         [0003]    In detail, the embodiments of the invention relate to a plasma enhanced chemical vapor deposition (PECVD) apparatus and a method for controlling the same. 
         [0004]    2. Description of the Related Art 
         [0005]    Throughout the industry there have been increasing demands for usage of a film (namely, a functional film) having a specific function that will be formed on a base material. This is because the functional film can compensate for the performance the base material lacks. For example, on a surface of a heat exchanger and a surface of a side mirror for a vehicle may be formed with a functional film having a predetermined function, such as corrosion resistance and hydrophilicity. As one of such examples, a heat exchanger for an air conditioner will be described as follows. 
         [0006]    An air conditioner is an electric appliance having a function of controlling a desired temperature and humidity of a predetermined room. Such an air conditioner typically uses a freezing cycle and the freezing cycle, and includes a compressor, an evaporator, an expansion valve and a condenser. The evaporator and the condenser are types of heat exchangers, and they include a tube to enable flow of a refrigerant therein and a cooling fin installed in a tub. In other words, the refrigerant flowing in the evaporator and the condenser heat-exchange heat with ambient air. The evaporator may absorb the heat while evaporating the refrigerant and the condenser may emit the heat while condensing the refrigerant. 
         [0007]    However, when a surface temperature of the heat exchanger falls below a dew point, air is condensed and a water droplet is generated on a surface of the heat exchanger. If the water droplet generation is severe, the water droplet is frozen to become a frost. The water droplet and/or the frost generated on the surface of the heat exchanger might cause several problems. For example, the water droplet and/or frost might reduce a heat exchange area to thereby deteriorate the heat exchanging performance of the heat exchanger. Also, the water droplet and/or frost might produce a kind of flow resistance, to increase the power required by a fan used to generate flow of air to the heat exchanger. Accordingly, it is preferable that the water droplet and the like are not condensed on the surface of the heat exchanger. To solve the problem, it has been attempted that the surface of the heat exchanger has hydrophilicity to cause flow of the condensed water droplet down the surface of the heat exchanger. 
         [0008]    Meanwhile, a heat exchanger, especially, a heat exchanger installed in an outdoor unit of the air conditioner is exposed directly to an outside whereby corrosion might occur as usage time passes. Such a phenomenon might be severe when the heat exchanger is installed in salty conditions such as near a sea shore. Accordingly, it has been proposed that application of a corrosion resistance coating should be performed on a surface of the heat exchanger. 
         [0009]    In addition, as the usage time passes, fungus and bacteria inhabit a surface of a heat exchanger and a bad smell might be generated, which might present a sanitary problem. However, the heat exchanger is typically mounted in an indoor or outdoor unit and it is not easy to clean the heat exchanger. As a result, it has been proposed that anti-bacteria/anti-fungi (hereinafter, antibiotic) coating should be provided on the surface of the heat exchanger. 
         [0010]    Meanwhile, an apparatus having a functional film formed by using conventional plasma enhanced deposition and a method for controlling the same will be described as follows. 
         [0011]    First of all, a base material is cleaned in a cleaning chamber. After that, the cleaned base material is deposited in a plasma reaction chamber for plasma reaction and a functional film is generated. The base material having the functional film formed therein is re-cleaned in the cleaning chamber. In other words, according to the conventional plasma enhanced deposition, pre-cleaning, functional film deposition and post-cleaning are performed in various chambers. Also, when forming the functional film, a corrosion resistance layer, a hydrophilicity film and an anti-biotic film are formed in different chambers, respectively. As a result, the conventional plasma enhanced deposition has to include independent chambers to perform each of the processes and each of the processes may be performed in each of the different chambers independently. Accordingly, the apparatus and control method for forming the functional layer might be disadvantageously complex. 
         [0012]    Also, the conventional plasma enhanced deposition using conventional functional film forming technology has proposed that the functional film be formed on a raw material before manufacturing a product. In other words, it has been proposed that the functional film should be formed on the surface of the sheet shaped material before the sheet shaped material having the functional film formed thereon is processed to manufacture a radiation fin of the heat exchanger. 
         [0013]    However, this has a problem of failing to manufacture the product having the functional film formed in all parts thereof. Also, the functional film is not formed on an area processed from a raw material, for example, a front sectional area, so that corrosion might be partially generated in the front sectional area. Accordingly, reliability of the product might be deteriorated. 
         [0014]    To solve the problem, Korean Patent No. 10-2003-0078455 discloses a plasma enhanced chemical vapor deposition apparatus to form a functional film on a product itself. 
         [0015]    In the conventional plasma enhanced chemical vapor deposition apparatus, a product is conveyed to a carrier to form the functional layer. An electric power is supplied to the product via the carrier in contact with a pair of rollers. Accordingly, the power supply is quite complex and the electric power is supplied via the rollers so that reliability of power supply might be deteriorated disadvantageously. Also, the functional film is formed on the carrier and efficiency might be deteriorated disadvantageously. 
         [0016]    Moreover, the product, that is, the heat exchanger is transferred while being hung on the carrier. Accordingly, the transfer structure is complex and the electric power fails to be supplied between the carrier and the heat exchanger stably and this might cause a problem. 
         [0017]    A single electrical connecting contact has to be formed in the heat exchanger and a uniform functional film cannot be formed in the heat exchanger entirely. 
         [0018]    Meanwhile, in the conventional plasma enhanced chemical vapor deposition apparatus, it might not be easy to load and unload the heat exchanger. Accordingly, the work process happens to be inefficient and it might be difficult to install and separate the carrier. 
         [0019]    Also, it is difficult for the worker to assemble and disassemble the heat exchanger to the carrier and it is difficult to form the functional film on a variety of heat exchangers. Meanwhile, the worker has to operate the carrier as well as the heat exchanger and the work process might be difficult. 
       SUMMARY OF THE INVENTION 
       [0020]    Accordingly, embodiments of the invention are directed to a plasma enhanced chemical vapor deposition apparatus and a method for controlling the same. To solve the problems, an object of the embodiments of the invention is to provide an apparatus including a simple and efficient functional layer and a method for controlling the apparatus. 
         [0021]    Another object of the embodiments of the invention is to provide an apparatus including a functional film that can be mass-productive by supplying an electric power stably, and a method for controlling the same. 
         [0022]    A further object of the embodiments of the invention is to provide an apparatus including a functional film that enables a worker to load and unload a product. 
         [0023]    A still further object of the embodiments of the invention is to provide a plasma enhanced chemical vapor deposition apparatus that increases the number of supporting contacts supporting the product and the number of electric contacts and that forms a uniform functional film on the entire region of the product by dispersing the increased supporting and electric contacts. 
         [0024]    A still further object of the embodiments of the invention is to provide a plasma enhanced chemical vapor deposition apparatus capable of adjusting pitches between the supporting points to form stable supporting and electric contacts according to the various sizes and types of the product. 
         [0025]    In an embodiment, a plasma enhanced chemical vapor deposition apparatus includes a loading station to load an object on a pallet; an operation station to form a functional film by performing plasma reaction to the object loaded on the pallet; a unloading station to separate the object from the pallet; a circulation station to convey the pallet from the unloading station to the loading station; and a conveyer to convey the pallet to the stations sequentially to circulate the pallet. 
         [0026]    The operation station may include a chamber to receive the object therein. 
         [0027]    In the chamber there may be provided a power supplier to selectively supply an electric power to the pallet within the chamber; and an electric pole having an opposite polarity to the power supplier. 
         [0028]    The plasma enhanced chemical vapor deposition apparatus may further include an entry door to selectively open and close the chamber. 
         [0029]    The conveyer may include a front part provided in front of the entry door to convey to convey the pallet to the chamber. 
         [0030]    The conveyer may include an elevator to change a vertical position of the pallet. The change of the vertical position of the pallet may enable a worker to adjust the loading height and the unloading height for the object efficiently. The elevator may be used for circulating the pallet. 
         [0031]    The conveyer may include an internal part to convey the pallet within the chamber. 
         [0032]    The plasma enhanced chemical vapor deposition apparatus may further include a rear door to selectively open and close the chamber. 
         [0033]    The conveyer may include a rear part provided in front of the entry door to convey to convey the pallet to the chamber. 
         [0034]    The rear part may include an elevator to change a vertical position of the pallet. 
         [0035]    The conveyer comprises a connecting part provided outside the chamber to convey the pallet from the front part to the rear part. 
         [0036]    The electric pole may include at least a couple of electric surfaces facing each other. 
         [0037]    A side door may be formed in a side surface of the chamber to selectively open and close the chamber and the electric pole is provided in the side door. 
         [0038]    The electric surface may include a net-shaped plasma reacting surface and an electric pole holder supporting the reacting surface at both sides of the reacting surface. 
         [0039]    A holder coupler may be provided in an inner wall of the chamber to support the electric pole holder and the holder coupler may be elastically supported to generate an elastic force in an outward direction of the holder coupler. 
         [0040]    The electric surface may include a plurality of layers and a nozzle is provided between the layers of the plasma reacting surface to supply a reaction gas, a precursor and a carrier gas. 
         [0041]    The nozzle may be formed in a surface of a circular tube along a longitudinal direction of the circular tube and a heater may be buried in a rear surface of the circular tube. 
         [0042]    The circular tub may be positioned in front of an electric surface. 
         [0043]    The power supplier may include a moving contact moving forwardly to selectively contact a contact of the pallet. 
         [0044]    In an embodiment, a plasma enhanced chemical vapor deposition apparatus may include a pallet to load and convey an object thereon to provide a functional film to the object by plasma reaction, wherein the pallet comprises, a base; a jig to fix the object; and a fixing part disposed on the base at an upper side of the fixing part to fix the object to the pallet. 
         [0045]    The apparatus plasma enhanced chemical vapor deposition apparatus may further comprise a conveyer to convey the pallet, wherein an insulation material may be provided between the conveyer and the base. 
         [0046]    The apparatus plasma enhanced chemical vapor deposition apparatus may further comprise a power supplier to selectively supply an electric power to the pallet, wherein the supplied electric power is supplied to the object via the jig. 
         [0047]    The fixing part may be formed in each of both sides of the pallet along a longitudinal direction of the pallet. 
         [0048]    The fixing part may comprise a pallet contact selectively surface-contacting with the power supplier. 
         [0049]    The apparatus plasma enhanced chemical vapor deposition apparatus may further comprise a connecting wire to electrically connect the fixing parts with each other. 
         [0050]    The fixing part may comprise an adjusting plate having a plurality of holes formed therein to be connected with the jig to adjust a fixing position of the jig. 
         [0051]    The jig may comprise a body comprising a recess  78  to fixedly insert a predetermined area of the heat exchanger  5  therein and a supporting part inserted in the plurality of the holes to support the body. 
         [0052]    A slot with a small radius may be formed in the supporting part. 
         [0053]    The fixing part may comprise a fixing plate disposed between the jig and the adjusting plate to fix the jig. 
         [0054]    A plurality of slots may be formed in the fixing plate to insert the slot of the supporting part therein. 
         [0055]    The slots may comprise a long slot and a shot slot. 
         [0056]    An insulating material may be disposed between the fixing part and the base. 
         [0057]    In an embodiment, a plasma enhanced chemical vapor deposition apparatus comprises: a chamber in which plasma reaction is performed to provide a functional film to an object received therein; a conveyer to convey the pallet from an outside of the chamber into an inside of the chamber; an electric pole provided in he chamber; and a power supplier comprising a moving contact, to supply an electric power to the object, when the pallet is standing on the electric pole, wherein the pallet comprises, a base; a fixing part disposed on the base at an upper side of the fixing part to fix the object to the pallet; an insulating material disposed between the fixing part and the base to insulate them from each other; and a connecting wire to electrically connect the plurality of the fixing parts with each other. 
         [0058]    The base may comprise an insulation material which may be provided between the conveyer and the base. 
         [0059]    The apparatus may further comprise a plurality of jigs to support the object in the fixing part, wherein a plurality of holes coupled to the plurality of the jigs along a longitudinal direction and a transverse direction with respect to the fixing part to make a pitch along a longitudinal direction be different from a pitch along a transverse direction between the jigs. 
         [0060]    The apparatus may further comprise a partition wall to partition an inside of the chamber into both sides; a side door formed in each of the sides, wherein electric poles facing each other are provided in the side doors in the sides with respect to the partition wall. 
         [0061]    The fixing part may be formed in each of the sides along a longitudinal direction of the pallet and the partition wall is positioned between the fixing parts in plasma reaction within the chamber. 
         [0062]    In an embodiment, a pallet for a plasma enhanced chemical vapor deposition apparatus for forming a functional film on a heat exchanger may comprises: a base; and at least one fixing part disposed on the base, and selectively receiving a jig at an upper side of the at least one fixing part to fix the heat exchanger to the pallet so as to form the functional film on the heat exchanger by using a plasma reaction. 
         [0063]    The apparatus for providing the functional film and the method for controlling the same may have following effects. 
         [0064]    First of all, a product having a functional film such as corrosion resistance, hydrophilicity and antibiotic functions may be manufactured more simply and efficiently. 
         [0065]    Furthermore, the apparatus according to the embodiments of the invention are mass-productive and production cost may be reduced effectively by supplying an electric power to the product stably. 
         [0066]    Still further, the apparatus according to the embodiments of the invention may provide the pallet for a worker to load and unload the product smoothly. 
         [0067]    Still further, the apparatus according to the embodiments of the invention may increase the number of supporting contacts supporting the product and the number of electric contacts and that forms a uniform functional film on the entire region of the product by dispersing the increased supporting and electric contacts. 
         [0068]    Still further, the apparatus according to the embodiments of the invention is capable of adjusting pitches between the supporting points to form stable supporting and electric contacts according to the various sizes and types of the product. 
         [0069]    It is to be understood that both the foregoing general description and the following detailed description of the embodiments or arrangements are by example and explanatory and are intended to provide further explanation of the embodiments as claimed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0070]    Arrangements and embodiments of the invention are described in detail with reference to the following drawings in which like reference numerals refer to like elements and wherein: 
           [0071]      FIG. 1  is a perspective view of a plasma enhanced chemical vapor deposition apparatus according to an embodiment of the invention; 
           [0072]      FIG. 2  is a block view of a plasma enhanced chemical vapor deposition apparatus shown in  FIG. 1 ; 
           [0073]      FIG. 3  is a flow chart illustrating a method for depositing plasma according to an embodiment of the invention; 
           [0074]      FIG. 4  is a front view illustrating a circulation of a pallet shown in  FIG. 1 ; 
           [0075]      FIG. 5  is a sectional view of the pallet; 
           [0076]      FIG. 6  is a sectional view of a fixing part provided in the pallet; 
           [0077]      FIG. 7  is a perspective view of the pallet; 
           [0078]      FIG. 8  is a perspective view of a jig; 
           [0079]      FIG. 9  is a perspective view of a fixing plate provided in the pallet; 
           [0080]      FIG. 10  shows an electric pole; 
           [0081]      FIG. 11  is a plane view of the electric pole; 
           [0082]      FIG. 12  is a perspective view of a power supplier; and 
           [0083]      FIG. 13  is an exploded perspective view of the power supplier. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0084]    Reference will now be made in detail to specific embodiments, examples of which are illustrated in the accompanying drawings. Wherever possible, same reference numbers will be used throughout the drawings to refer to the same or like parts. 
         [0085]    As follows, a heat exchanger will be embodied as one of examples having a functional film and the embodiments of the invention are not limited thereby. The embodiments of the invention are applicable to other products. 
         [0086]    First of all, in reference to  FIG. 1 , a detailed configuration of an apparatus providing a functional film according to an example embodiment of the invention will be described. 
         [0087]    According to this embodiment of the invention, a heat exchanger  5  may be provided to a chamber  1  that provides a functional film to an object by performing a plasma reaction. In other words, an auxiliary chamber to clean the heat exchanger  5  need not be provided before and after the plasma reaction but such a function may be performed in a single chamber  1  according to the embodiment of the invention. The plasma reaction is performed on an object, for example, the heat exchanger  5  or other items, held in the chamber  1  may be supplied or provided with the functional film. 
         [0088]    The chamber  1  may be connected with a precursor supply unit  400  to supply a precursor to the chamber  1 , and with a reaction gas supply unit  300  to supply reaction gas to the chamber  1 . Also, the chamber  1  may be connected with a cleaning gas supply unit  200  to enable supply to the chamber  1  a cleaning gas used for cleaning the heat exchanger  5  both before and after the plasma reaction. The chamber  1  may be connected with an exhaustion unit  100  to exhaust gases from the chamber  1  In other words, the cleaning gas remaining after the cleaning and gases remaining after the plasma reaction are exhausted to the outside of the chamber  1 . 
         [0089]    The precursor supply unit  400 , the reaction gas supply unit  300 , the cleaning gas supply unit  200  and the exhaustion unit  100  may be controlled by a control unit  500  as shown in  FIG. 2 . 
         [0090]    According to the embodiment of the invention, the chamber  1  may be a predetermined room or space to provide a functional film to the object, such as a heat exchanger  5 , for example, a product or a part to which an additional mechanical process will not be performed. As a result, a conveyer may be required to convey the object. 
         [0091]    Specifically, the embodiment of the invention may further include a pallet  7  connected with the object mechanically and electrically. The object may be loaded on the pallet  7  stably and supportably. An electric power may be applied to the object via the pallet  7 . 
         [0092]    Meanwhile, the chamber  1  may include a front door (or an entry door)  12   a  provided to selectively open and close the chamber  1 . The heat exchanger  5  may be placed into the chamber  1  via the front door  12   a,  and the functional film may be provided while the heat exchanger  5  is in the chamber  1 . As a result, regions located before (or in front of) and after (or behind) the front door  12   a  may be referred to as a loading station (A) and an operation station (B), respectively. In this instance, the operation station (B) may be an internal room of the chamber  1 . 
         [0093]    As mentioned above, the embodiment of the invention may provide one or more functional films in quantity (or bulk) to the object. For that, a conveyer  3  may be provided to convey the heat exchanger  5  into the chamber  1 . In other words, the conveyer  3  may convey the heat exchanger  5  from outside the chamber  1  (the loading station A) to inside of the chamber  1  (the operation station B). 
         [0094]    More specifically, the heat exchanger  5  may be connected with the pallet  7  mechanically and electrically. That is, the heat exchanger  5  may be loaded on the pallet  7  stably and supportably, and the heat exchanger  5  may be connected with the pallet  7  electrically. The pallet  7  may be conveyed by the conveyer  3  directly and the object (e.g., the heat exchanger  5 ) may be conveyed indirectly via the pallet  7 . 
         [0095]    The conveyer  3  may include a front part  3   a  provided in front of the front door  12   a  to convey the pallet  7  to the chamber  1 . Also, the conveyer  3  may include an internal part  3   c  to convey the pallet  7  within the chamber  1 . 
         [0096]    The internal part  3   c  may be configured to convey the pallet  7  to a preset position inside the chamber  1 . In other words, the preset position is a position to apply the electric power to the object to provide the functional film. 
         [0097]    The loading and unloading of the heat exchanger  5  and the providing of the functional film may be enabled by the front part  3   a,  the front door  12   a  and the internal part  3   c  mentioned above. The heat exchanger  5  to be provided with the functional film may be unloaded using the internal part  3   c,  the front door  12   a  and the front part  3   a.  In this instance, a loading station (A) and an unloading station (B) may be identical. That is, the loading and unloading of the heat exchanger  5  may be performed in the front of the front door  12   a.    
         [0098]    However, the loading station and the unloading station are overlapped in this instance, and it may be difficult to perform the work smoothly. This is because the loading after the unloading has to be performed at the same position after the functional film is formed. In other words, the unloading or the loading cannot be performed while the functional film is being formed so that the work performance time increases disadvantageously. 
         [0099]    To solve this problem, a rear door (or an exit door)  12   b  may be provided in the chamber  1 . Like the front door  12   a,  the rear door  12   b  may selectively open and close the chamber  1 , and the heat exchanger  5  provided with the functional film may be taken out to the outside of the chamber  1  via the rear door  12   b.    
         [0100]    The conveyer  3  may include a rear part  3   b  provided behind the rear door  12   b  to convey the pallet  7  to the outside of the chamber  1 . As a result, the object (e.g., the heat exchanger  7 ) provided with the functional film may be taken out to the outside of the chamber  1  by the internal part  3   b,  the rear door  12   b  and the rear part  3   b.  The rear region behind the rear door  12   b  may be referred to as an unloading station (C) that unloads the object. 
         [0101]    The structure of the conveyer  3  may enable the loading of the object, the providing of the functional film and the unloading of the object in series. Accordingly, the functional films may be provided to the objects en masse. 
         [0102]    Specifically, the conveyer  3  may include the front part  3   a,  the internal part  3   c  and the rear part  3   b  which are partitioned off from each other. However, those parts may be configured to convey the pallet  7  in series. In this instance, the expression of ‘partitioned’ may refer to ‘partitioned spatially’ and ‘controllable independently’. 
         [0103]    The pallet  7  may be conveyed on the conveyer  3 . In this instance, the heat exchanger  5  may be loaded on the pallet  7 . As a result, the loading of the heat exchanger  5 , the providing of the functional film to the heat exchanger  5  and the unloading of the heat exchanger  5  may be serially performed through the use of the pallet  7  and the parts of the conveyer  3 . 
         [0104]    Meanwhile, the embodiment of the invention may provide a structure enabling the pallet  7  to circulate. In other words, the structure may enable the pallet  7  having the heat exchanger  5  loaded thereon that is in the unloading station (C) to be conveyed back to the loading station (A) again. For that, the apparatus according to the embodiment of the invention includes a circulation station (D). As a result, the conveyer  3  may convey the pallet  7  from the loading station (A), to the operation station (B), to the unloading station (C) and to the circulation station (D) to thereby circulate through the various stations in order. 
         [0105]    As mentioned above, the apparatus according to this embodiment of the invention may have a following configuration to provide the functional film. In other words, the apparatus according to the embodiment of the invention may include the chamber  1 , the precursor supply unit  400 , the reaction gas supply unit  300 , the cleaning gas supply unit  200 , an exhaustion unit  100  and the control unit  500 . 
         [0106]    In reference to  FIG. 2 , each of the component parts will be described as follows, 
         [0107]    First of all, the chamber  1  will be described. 
         [0108]    In the body  13  of the chamber  1  may be provided the electric pole  16  to generate the plasma reaction and the nozzle  14  to exhaust the precursor, the reaction gas and the cleaning gas. The heater may be provided in the chamber  1  to control the temperature inside the chamber  1 . The component parts provided for the plasma reaction such as the electric pole  16 , the nozzle  14  and the heater may be provided in the chamber  1 . 
         [0109]    A side door  12   c  may be formed in a lateral side of the chamber  1 . A window  12   d  may be provided in the side door  12   c,  and an internal room of the chamber  1  may be visible via the window  12   d.    
         [0110]    The side door  12   c  may be provided for the worker to have access to the internal room of the chamber  1 . As a result, the number of the side doors  12   c  may be provided corresponding to the number of the pallets  7  positioned in the chamber  1 . According to this embodiment of the invention, two side doors  12   c  may be formed in a lateral side of the chamber  1  and two side doors  12   c  may be formed in an opposite lateral side of the chamber  1 . 
         [0111]    As shown in  FIG. 2 , a partition wall  18  may be provided in a center of the chamber  1  to partition off the chamber  1  into both (or two) parts. The plasma reaction may be performed in each of the both parts partitioned by the partition wall  18 . For example, the heat exchangers  5  loaded in a left side of the pallet  7  may be exposed to the plasma reaction from a left part of the chamber  1  with respect to the partition wall  18  and the heat exchangers  5  loaded on a right side of the pallet  7  may be exposed to the plasma reaction from a right part of the chamber  1  with respect to the partition wall  18 . 
         [0112]    As a result, electric poles may be provided in both parts of the chamber with respect to the partition wall  18 , respectively. In this instance, a lower part of the partition wall may be open. In other words, the pallet may be conveyed via the open part. The open part may be positioned in a center of the pallet and objects may be loaded on fixing parts formed in both sides of the pallet. Accordingly, the objects may be loaded in parallel and the plasma reaction may be performed to the objects simultaneously. 
         [0113]    For the plasma reaction, the component parts including the electric pole  16 , the nozzle  14  and the heater may be provided in each of the both parts of the chamber  1  with respect to the partition wall  18 . Also, the component parts may be provided at the side door  12   c  facing the partition wall  18 . As a result, the worker can open or access the chamber  1  via the side door  12   c  and he or she may approach or access the chamber  1  for repair and maintenance of the chamber  1  with ease. 
         [0114]    Meanwhile, according to the embodiment of the invention, the pre-cleaning, the post-cleaning and the plasma reaction may be performed in the chamber  1 . The precursor supply unit  400 , the reaction gas supply unit  300 , and the cleaning gas supply unit  200  have to be connected with the chamber  1 . Of course, the exhaustion unit  100  to exhaust remnants after the cleanings and the plasma reaction to the outside of the chamber  1  may be connected with the chamber  1 . 
         [0115]    The precursor supply unit  400  will be described as follows. 
         [0116]    According to a conventional technology, different chambers may be provided for corrosion resistance, hydrophilicity and antibiotic functions, respectively. A precursor is provided in each of the chambers. However, according to this embodiment of the invention, a single precursor for the corrosion resistance, hydrophilicity and antibiotic functions, which will be described later in detail, may be used, and a film having the corrosion resistance, the hydrophilicity and the antibiotic functions may be formed in the single chamber  1  at one time. As a result, a single precursor supply unit  400  may be provided. 
         [0117]    A supply pipe  402  may connect a container  410  containing a liquid precursor and the chamber  1  with each other. A flowing control part  420  to control the flowing of the liquid precursor and a vaporizer  430  to vaporize the liquid precursor may be provided at a predetermined position of the supply pipe  402 . To flow the liquid precursor efficiently, a carrier gas tank  600  may be connected with a predetermined position of the supply pipe  402 . Also, a heat generating part  432 , such as a heating wire, may be provided in the supply pipe  402  provided between the vaporizer  430  and the chamber  1 , to maintain the vaporized status of the precursor. 
         [0118]    The precursor may be a precursor (hereinafter, a multi-functional precursor) capable of forming a film having the corrosion resistance, the hydrophilicity and the antibiotic functions. The carrier gas may be helium and/or argon, and since the carrier gas may be identical to the carrier gas according to the conventional technology, a detailed description thereof will be omitted accordingly. 
         [0119]    The reaction gas supply unit  300  will be described as follows. 
         [0120]    A supply pipe  302  may be provided between a container  310  containing a reaction gas and the chamber  1 . A flow controlling part  320  to control the flow of the reaction gas may be provided at a predetermined position of the supply pipe  302 . The reaction gas may be air, oxygen and/or helium. 
         [0121]    The cleaning gas supply unit  200  will be described as follows. 
         [0122]    A supply pipe  202  may be provided between a container  210  containing a cleaning gas and the chamber  1 . A flow controlling part  220  may be provided in a predetermined position of the supply pipe  202  to control the flow of the cleaning gas. The cleaning gas may be air. Those configurations may be similar to those of the conventional technology so that detailed descriptions thereof will be omitted accordingly. If air is used as the reaction gas, the cleaning gas supply unit  200  may be not provided, and the reaction gas supply unit  300  may be substituted for the cleaning gas supply unit  200 . 
         [0123]    The exhaustion unit  100  to exhaust the gases remaining in the chamber  1  to the outside the chamber  1  will be described as follows. 
         [0124]    An exhaustion pipe  102  may be provided between a pump  110  used to exhaust the gases remaining in the chamber  1  to the outside and the chamber  1 . A filter  120  may be provided at a predetermined position of the exhaustion pipe  102  to filter the gases exhausted to the outside. The pump  110  may exhaust the gases from the inside of the chamber  1  to the outside, and it may be a vacuum pump to exhaust the gases to the outside of the chamber  1  and to make the inside of the chamber  1  be a vacuum state. 
         [0125]    The control unit  500  will be described as follows. 
         [0126]    The control unit  500  may control the chamber  1 , the precursor supply unit  400 , the reaction gas supply unit  300 , the cleaning gas supply unit  200  and the exhaustion unit  100 . Also, the control unit  500  may control the conveyers  3   a,    3   c  and  3   b  that convey the pallet  7  having the heat exchangers  5  loaded thereon. 
         [0127]    In reference to  FIGS. 2 and 3 , a method for controlling an apparatus for providing a functional film according to an embodiment of the invention will be described as follows. 
         [0128]    First of all, an object (the heat exchanger  5  according to this embodiment of the invention) may be supplied to the chamber  1  (a supplying operation, S 1 ). Given the heat exchanger  5  in the chamber  1 , the cleaning gas may be supplied to the chamber  1  to clean the heat exchanger  5  (pre-cleaning operation, S 3 ). In this instance, when the heat exchanger is clean already, this operation may be omitted or skipped. 
         [0129]    After the heat exchanger  5  is cleaned, the precursor may be supplied to the chamber  1  to generate a plasma reaction and the functional film may be provided to the heat exchanger  5  (functional film providing operation, S 5 ). After the functional film is formed, the cleaning gas may be supplied to the chamber  1 , and the heat exchanger  5  having the functional film formed therein may be re-cleaned (post-cleaning operation, S 7 ). Lastly, the heat exchanger  5  having the functional film formed therein may be unloaded to the outside of the chamber  1  (unloading operation, S 9 ). 
         [0130]    Each of the operations will be described in detail as follows. 
         [0131]    The supplying operation (S 1 ) to supply or load the heat exchanger  5  to the chamber  1  will be described. The heat exchanger  5  may be loaded on the pallet  7 , and the pallet  7  having the heat exchanger  5  loaded thereon may be conveyed by the front part  3   a  of the conveyer  3  to the chamber  1 . In other words, the front door  12   a  may be opened and the front part  3   a  and the internal part  3   c  of the conveyer  3  may be driven. After that, the heat exchanger  5  may be conveyed into the chamber  1 . Once the introduction of the heat exchanger  5  into the chamber is complete, the front door  12   a  may be closed. 
         [0132]    Meanwhile, the parts of the conveyers  3   a,    3   c  and  3   b  may be controlled independently or in communication with each other. When they are controlled in communication with each other, the introduction and exhaustion of the different heat exchangers  5  may be performed simultaneously. 
         [0133]    The pre-cleaning operation (S 3 ) to clean the heat exchanger  5  before forming of the functional film will be described. The cleaning gas supply unit  200  may supply the cleaning gas to the chamber  1 , and the heat exchanger  5  may be cleaned by the cleaning gas. Once cleaning of the base material is complete, the gas remaining inside the chamber  1  may be exhausted by the pump  110  provided in the exhaustion unit  100 . During the process, the gas may be exhausted until the internal room of the chamber reaches  1  an initial vacuum level. 
         [0134]    The functional film providing operation (S 5 ) to form or provide the functional film on the heat exchanger  5  will be described. First of all, the gases remaining in the chamber  1  may be substantially exhausted to the outside of the chamber  1  by using the exhaustion unit  100 , especially, by operating the pump  110 , to make a vacuum level of the chamber  1  reach a workable vacuum level. Also, the chamber  1  may be controlled to have a temperature by using a heater provided in the chamber  1  to make the chamber  1  satisfy a preset temperature condition. 
         [0135]    The electric power may be provided for supply to the heat exchanger  5 , specifically, the pallet  7 , which will be described later. 
         [0136]    Once the internal condition of the chamber  1  is fitted to the plasma reaction, that is, once the vacuum level inside the chamber  1  reaches the workable vacuum level, the flow controlling part  320  of the reaction gas supply unit  300  may be controlled and the reaction gas may be supplied to the chamber  1 . Also, the precursor may be supplied to the chamber by controlling the flow controlling part  420  of the precursor supply unit  400 . 
         [0137]    The quantity and supply time of the reaction gas, the quantity and supply time of the precursor, and the plasma reaction time may be controlled to be optimal or workable. 
         [0138]    The post-cleaning operation to clean the heat exchanger  5  having the functional film formed thereon will be described. The cleaning gas may be supplied to the chamber  1  by the cleaning gas supply unit  200 , and the heat exchanger  5  having the functional film formed thereon may be cleaned by the cleaning gas. Once the cleaning is complete, the gas may be exhausted to the outside of the chamber  1  by operating the pump  110  of the exhaustion unit  100 . 
         [0139]    Meanwhile, the post-cleaning operation may be performed right after the completion of the plasma reaction. In other words, the cleaning gas may be supplied after the plasma reaction completion and it may be possible to exhaust the reaction remnants and clean the heat exchanger  5  simultaneously. 
         [0140]    The plasma reaction may be performed by supplying the electric power to the heat exchanger  5 . As a result, when the plasma reaction is complete, an operation performed to supply the electric power to the heat exchanger will be cleared. Such the power supply clearing operation may be performed after the completion of the plasma reaction. Alternatively, the power supply clearing operation may be performed after the post-cleaning operation. 
         [0141]    Once the post-cleaning operation is completed, a vent operation to relieve a pressure difference between an inner space and an external space with respect to the chamber may be performed. 
         [0142]    The unloading operation to unload the heat exchanger  5  having the functional film formed thereon from the chamber  1  will be described. The heat exchanger  5  having the functional film and loaded on the pallet  7  may be conveyed outside the chamber  1  by the parts  3   a,    3   c  and  3   b  of the conveyer  3 . As a result, introduction and exhaustion of the heat exchanger  5  may be performed simultaneously. Also, during the plasma reaction, the loading and unloading of the heat exchangers  5  may be performed simultaneously. Accordingly, forming of the functional film en masse through use of a series of operations is possible. 
         [0143]    In reference to  FIG. 4 , the circulation of the pallet  7  with respect to the conveyer  3  will be described in detail as follows. 
         [0144]    In an embodiment of the invention as mentioned above, two heat exchangers  5  may be loaded on a single pallet  7  at both sides thereof. The chamber  1  may hold two pallets  7  along a longitudinal direction. In this instance, a single plasma working may provide functional films to the heat exchangers  5  loaded on the two pallets  7 , that is, four heat exchangers  5 , respectively. The chamber  1  may be configured to hold two or more pallets  7 . Also, two or more objects (e.g., the heat exchangers  5 ) may be loaded on a single pallet  7 . 
         [0145]    For increased work efficiency, a first set of two pallets  7  may be located in the loading station (A) along a longitudinal direction of the pallets  7 , and a second set to two pallets  7  may be located even in the unloading station (B) along the longitudinal direction. In this instance, additional third set of two pallets  7  may be located in the chamber  1 . Thus, such pallets  7  may be positioned on the front part  3   a,  the internal part  3   c  and the rear part  3   b.    
         [0146]    For the circulation of the pallets  7 , the conveyer  3  may include a connecting part  3   d  to convey the pallet  7  from the rear part  3   c  to the front part  3   a.  The connecting part  3   d  may be provided outside the chamber  1 . Especially, the connecting part  3   d  may be provided below the chamber  1 . 
         [0147]    More specifically, the connecting part  3   d  may be positioned under the other parts of the conveyer  3  in parallel. 
         [0148]    The front part  3   a  and the rear part  3   b  may include elevators  4   a  and  4   b,  respectively, to change perpendicular positions of the pallet  7 . 
         [0149]    First of all, once the unloading of the heat exchanger  5  is completed in the unloading station (C), the pallet  7  may be conveyed downwardly by the operation of the elevator  4   b.  After that, the pallet  7  may be conveyed to the loading station (A) by the connecting part  3   d  from the circulation station (D). In this instance, the pallet  7  may be positioned downside and it may be elevated by the operation of the elevator  4   a.  The elevators  41  and  4   b  may be configured to elevate the pallet  7 . Accordingly, the pallet may be circulated by each of the component parts provided in the conveyer  3 . 
         [0150]    In this instance, the loading and the unloading may be performed by a worker. The perpendicular positions of the loading and the unloading may be very important for work efficiency. The perpendicular positions in this instance may be different from perpendicular positions of the pallet  7  inside the chamber  1 . 
         [0151]    As a result, the elevators  4   a  and  4   b  may be adjusted to have a plurality of preset heights. In other words, the perpendicular height may be adjusted for a conveying position and a circulating position. Also, it may be adjusted for a loading position and an unloading position. The loading and unloading positions may be located between the conveying position and the circulating position, and be higher than the conveying position. 
         [0152]    Meanwhile, it might take a much time to convey the pallet  7  to circulate to the loading station (A) from the unloading station (C). Accordingly, the pallet  7  may be provided in the circulating station (D). In other words, once forming of the functional film is complete, the pallet  7  positioned in the circulating station (D) may be conveyed to the loading station (A) and the pallet  7  positioned in the unloading station (C) may be conveyed to the circulating station (D). As a result, it may be possible to reduce the time taken to circulate the pallets  7  remarkably. 
         [0153]    Flow of processes relating to the circulation of the pallets  7  will be described. 
         [0154]    The loading in the loading station (A), the functional film being provided in the operating station (B) and the unloading in the unloading station (C) may be performed simultaneously. The pallet  7  having no heat exchangers  5  loaded thereon may be waiting in the circulating station (D). When the work is completed, each of the pallets  7  positioned in each of the stations may be conveyed to the next station sequentially. As a result, serial work may be performed and the work process time may be reduced noticeably. 
         [0155]    The pallet  7  according to an embodiment of the invention will be described in detail in reference to  FIGS. 5 and 8  as follows. 
         [0156]      FIG. 5  is a sectional view illustrating the pallet  7  positioned on the conveyer  3  according to an embodiment of the invention. 
         [0157]    The pallet  7  may include a base  7   a.  The base  7   a  may be positioned at an upper area of the conveyer  3  to be directly conveyed by the conveyer  3 . The connection between the conveyer  3  and the base  7   a  may enable transfer of the pallet  7  stably without the pallet  7  rolling horizontally. Meanwhile, an electric power may be directly applied to the pallet  7 , and not via the conveyer  3 , which will be described in detail later. Accordingly, the electric power may be applied to the pallet  7  stably. 
         [0158]    In this instance, the electric power has to be prevented from being applied to the conveyer  3  via the pallet  7 . If the electric power is applied to the conveyer  3 , unnecessary functional films might be formed on the conveyer  3 . To prevent that, an insulation material  7   f  may be provided between the conveyer  3  and the base  7   a  of the pallet  7 . The insulation material may be coupled to a back surface of the base  7   a.    
         [0159]    Meanwhile, the pallet  7  may include a jig  7   b  to load the heat exchanger  5  thereon. In other words, the jig  7   b  may be provided to fix the object. The plurality of the jigs  7   b  may be provided, to fix the heat exchanger  5  more stably. 
         [0160]    The plurality of the jigs  7   b  may be provided along a longitudinal direction of the pallet to support the object more stably and to form an electrical contact, or they may be provided along a transverse direction of the pallet. As a result, a plurality of supporting points and electrical contacts may be formed for a single product. This can result in stable supporting of the product and uniform power supply to the product, such that a uniform functional film may be formed on the entire region of the product. 
         [0161]    The pallet  7  may include a fixing part  7   c  coupled to the jig  7   b  from a top side of the base  7   a,  to fix the heat exchanger  5  to the pallet  7 . 
         [0162]    A plurality of fixing parts  7   c  may be formed. The fixing parts  7   c  may be formed in both sides of the pallet  7  along a longitudinal direction of the pallet  7 , respectively. As a result, two heat exchangers  5  may be loaded on a single pallet  7 . The plurality of the heat exchangers may be loaded along a longitudinal direction of the single fixing part. The fixing part  7   c  may include a pallet contact  7   d.  In other words, the electric power may be applied to the pallet  7  via the pallet contact  7   d.    
         [0163]    The pallet contact  7   d  may be provided to one of the fixing parts  7   c.  This is because a position to supply the electric power to a single pallet may be one. Accordingly, one of the fixing parts  7   c  may be electrically connected with the other one of the fixing parts  7   c  via a connecting wire  7   e . In other words, the fixing part  7   c  and the base  7   a  may not be electrically connected with each other. This is because an unnecessary functional film should not be formed on the pallet  7 . As a result, the fixing part  7   c  and the base  7   a  may be insulated from each other and the insulating material  7   g  may be disposed between them. The insulating material  7   g  may be disposed between the pallet contact  7   d  and the base  7   a  to insulate them from each other. 
         [0164]    Accordingly, the electric power may be provided only to the fixing part and a connecting wire may be connected to the fixing parts to electrically connect them with each other. 
         [0165]    Meanwhile, a plurality of the pallet contacts  7   d  may be formed in one of the fixing parts  7   c  along a longitudinal direction of the fixing parts  7   c.  In this instance, the electric power may be supplied to only one of the pallet contacts  7   d.  This is because the plurality of the pallets  7  should not be introduced into the chamber along the longitudinal direction. In other words, the position to supply the electric power to a front one of the pallets  7  may be different from the position to supply the electric power to the next one of the pallets  7  that is located behind the front one. 
         [0166]    For example, a pallet contact  7   d  in front of the pallet  7  may be a contact used when the pallet  7  is positioned in the front and a pallet contact  7   d  behind the pallet  7  may be a contact used when the pallet is positioned in the back. 
         [0167]    In this instance, a moving contact of the power supplier may selectively contact with the pallet contact, when the pallet is standing in the chamber after moving. As a result, the electric power is supplied to the pallet when the pallet is standing and more stable and constant electric power supply may be enabled. 
         [0168]    In reference to  FIG. 6 , the structure of the fixing part  7   c  provided in the pallet  7  will be described in detail. 
         [0169]    The fixing part  7   c  may include an adjusting plate having a plurality of holes  71  formed therein to be connected with the jig  7   b.  If the plurality of the jigs  7   b  are coupled to the fixing part  7   c,  pitches between them may be adjusted. 
         [0170]    The pitches may include pitches along a longitudinal direction and pitches along a transverse direction of the pallet  7 . Accordingly, longitudinal distances and transverse distances may be adjusted between the jigs, and stable supporting of various products may be enabled. 
         [0171]    Also, the fixing part  7   c  may include a fixing plate  72  disposed between the jig  7   b  and the adjusting plate  70  to fix the jig  7   b.    
         [0172]    As shown in  FIGS. 6 and 8 , the jig  7   b  may include a body  75  and a supporting part  76 . A recess  78  may be formed in the body  75  to fixedly insert a predetermined area of the heat exchanger  5  therein. For example, a refrigerant tube provided in a lateral side of the heat exchanger  5  may be fixedly fitted to the recess  78 . As a result, the shape (and/or the size) of the recess  78  may be variable according to a shape (and/or the size) of an object fitted thereto. The In this instance, the shape(and/or the size) of the recess  78  formed in the jig  7   b  may be variable according to the type of the heat exchanger  5 . For example, the recess  78  may be formed in “U” shape. The jig  7   d  may be a configuration to support the heat exchanger and to transfer the electric power applied from the pallet contact  7   d  to the heat exchanger. 
         [0173]    Meanwhile, the number, size and shape of the tubes provided in the heat exchanger may variable according to the size of the heat exchanger. However, the number of the tubes may be typically two or more, to support the heat exchanger via the plurality of the jigs stably. Accordingly, stable power supply may be enabled. Change of the jigs may be corresponding to various heat exchangers. 
         [0174]    The supporting of the heat exchanger enabled by the recess  78  has following effects. That is, the shape of the recess may be the shape of the refrigerant tube such that the jig and the refrigerant tube may be in surface-contact within the recess. Accordingly, the electrical contacts may form a surface to enable the electric power to be supplied stably and uniformly. 
         [0175]    In this instance, the area formed by the electrical contacts is very important. If the electric power is supplied only to a specific point intensively, there might be a spark. Such a spark might interfere with stable plasma reaction and it might be difficult to form the uniform functional film. 
         [0176]    As a result, the supporting of the product enabled by the recess  78  of the jig is quite efficient and preferable. 
         [0177]    The supporting part  76  of the jig  7   b  may be rod-shaped and a slot  77  with a small radius may be formed in the supporting part  76 . 
         [0178]    In reference to  FIGS. 7 and 8 , the coupling among the jig  7   b,  the adjusting plate  70  and the fixing plate  72  will be described. 
         [0179]    The plurality of the holes  71  may be formed in the adjusting plate  70  as mentioned above. The plurality of the holes  71  may be formed in a preset pattern. For example, two holes  71  may be formed along a longitudinal direction of one of the fixing parts  7   c  and a single hole may be formed. Such a pattern may be repeated. As a result, the width of the jigs  7   b  may be adjusted by such that the plurality of the holes  71  and the plurality of the heat exchangers  5  may be loaded on a single fixing part  7   c.  In this instance, the various heat exchangers  5  may be supported stably. This is because the pitches between the jigs along the longitudinal direction and the pitches along the transverse direction can be adjusted by the pattern of the holes. 
         [0180]    The supporting part  76  of the jig  7   b  may be supported by being inserted in a specific hole of the adjusting plate  70 . In this instance, the fixing plate  72  may fix the jig  7   b  to the adjusting plate  70  stably. 
         [0181]    Specifically, as shown in  FIG. 8 , a plurality of slots  73  may be formed in the fixing plate  72 , corresponding to the holes  71  of the adjusting plate  70 . The width of the slot  73  may be smaller than the diameter of the hole  71  formed in the fixing plate  72 . The width of the slot  73  may correspond to the width of the slot  77  formed in the supporting part  76 . Also, the slot  73  may be open toward a preset direction. 
         [0182]    As a result, the fixing plate  72  may slide on the adjusting plate  70 , when the jig  7   b  is inserted to the hole  71  of the adjusting plate  70 . 
         [0183]    In other words, the fixing plate  72  may slide, with the slot of the supporting part  77  inserted in the slot  73  of the fixing plate  72 . After that, the fixing plate  72  may be fixed to the adjusting plate  70  and the jig  7   b  may be coupled to the adjusting plate  70  stably. To fix the fixing plate  73  to the adjusting plate  70 , a coupling hole  74  may be formed in the fixing plate  73 . 
         [0184]    Such a structure may enable the fixing and the adjusting of the jig  7   b.  As a result, the structure may deal with the various sizes and types of the heat exchangers  5  efficiently and easily. 
         [0185]    An electric pole will be described in detail in reference to  FIG. 9  as follows. 
         [0186]    An electric pole  16  may include at least a couple of electric surfaces facing each other. In other words, the electric surfaces may be formed at both sides of the object. 
         [0187]    The electric surfaces  160  may be provided in the partition wall  18  or the side door  12   c.  Such an electric surface  160  shown in  FIG. 9  may include a net-shaped (or mesh-shaped) plasma reacting surface  161  and an electric pole holder  162  supporting the plasma reacting surface  161  at each of both sides of the plasma reacting surface  161 . 
         [0188]    Also, a holder coupler  163  may be provided in an inner wall of the chamber  1  to support the electric pole holder  162 . The inner wall of the chamber  1  may be an inner wall of the side door  12   c  or an inner wall of a partition wall  18 . 
         [0189]    When the plasma reaction is repeatedly performed, the plasma reacting surface  161  might be increased (or be elongated) to droop disadvantageously and the plasma reaction might not be performed uniformly. To solve the problem, a tensile force may be applied to the plasma reacting surface  161 . 
         [0190]    For that, the holder coupler  163  may be elastically supported to generate an elastic force in an outward direction of the holder coupler  163 . In other words, a spring  164  may be provided behind the holder coupler  163 . When the electric pole holder  162  is coupled to the holder coupler  163  for the first time, the holder coupler  163  may be in a state similar to a spring being tensioned. When the plasma reacting surface  161  is loose, the tensile force may be applied to the plasma reacting surface  161  by a restitution (or recovery) of the spring. 
         [0191]    Meanwhile, the electric surface  160  may include a multi-stair (or a multi-step). As a result, the electric surface  160  having the plasma reaction performed thereon may be selectively controlled based on the height of the object. 
         [0192]    As shown in  FIG. 9 , a nozzle  14  may be positioned between the electric surfaces  160 . A reaction gas, a precursor and a carrier gas may be supplied via a nozzle  14 . 
         [0193]    In this instance, the nozzle  14  may be formed in a circular tube  140 . In other words, the gases flowing along the circular tube  140  may be supplied to the object via the nozzle  14  formed in a front side of the circular tube  140 . 
         [0194]    Meanwhile, the plurality of the circular tubes may be provided. The plurality of the circular tubes may be provided along the electric pole longitudinally or perpendicularly. The precursor and the other parts may be substantially provided into the chamber by the circular tubes provided longitudinally. 
         [0195]    In this instance, the circular tubes may be in communication with each other via both side fittings  149  to be replaced when they are damaged. The circular tubes may have the same length. Accordingly, auxiliary circular tubes having various lengths need not be prepared. A heater may be buried in the circular tube via cover, which will be described later, such that the circular tubes may enable the electric power to be supplied to the heater. 
         [0196]    The position of the circular tube  140  may be in front of the electric surface  160 . In other words, the circular tube may be closer to the object. Accordingly, the nozzle  14  may be prevented from being clogged noticeably. 
         [0197]    The plasma reaction may be performed by the reaction gas, the precursor and the carrier gases supplied via the nozzle. There might be difference between the supply of the precursor from the position where the reaction is performed and the supply of the precursor to the position where the reaction is performed. 
         [0198]    When the precursor is supplied from the position where the reaction is performed, most of the supplied precursors can be used in the plasma reaction and a pressure difference between a nozzle inside and a nozzle outside may be maintained constantly. Accordingly, the precursors may be supplied via the nozzle constantly. However, when the precursor is supplied from the position where the reaction is not performed to the position where the reaction is performed, a predetermined amount of the supplied precursors cannot be used in the plasma reaction. Accordingly, the pressure of the nozzle outside might be high and nozzle clogging might be generated. As a result, the position of the circular tube, that is, the position of the nozzle may be located in front of the electric surface  160 . In other words, the nozzle may be closer to the plasma object than the electric surface. 
         [0199]    A heater  402  may be provided in the circular tube  140  to heat the gases and the like so as to enable the gas and the like to flow smoothly therein. However, the heater  402  might be easily damaged by the plasma reaction. Thus, it may not be preferable that the circular tube  140  is integrally formed with the heater  402 . 
         [0200]    Accordingly, to ease installation and repair, the heater  402  may be buried in a rear surface of the circular tube and a cover  143  may be provided, before fixing a wire (or a heating wire)  142 . 
         [0201]    In this instance, the plurality of the circular tubes  140  may be provided, with the nozzle  14  formed therein. Such the circular tubes may be in communication with each other via both side fittings  149 . Accordingly, if damage is generated in one of the circular tubes, for example, nozzle clogging or heater damage, only the damaged circular tube may be replaced. 
         [0202]    In reference to  FIGS. 11 and 12 , a power supplier to supply an electric power to the pallet will be described in detail as follows. 
         [0203]    The electric pole  16  mentioned above may be provided in the chamber  1 . In other words, the electric poles  16  may face the partition wall  18  and the side door  12   c  within the chamber  1 , respectively. The heat exchanger  5  may be positioned between the electric poles  16 . 
         [0204]    For the plasma reaction, a pole of the electric pole  16  may be opposite to a pole of the heat exchanger  5 . According to the embodiment of the invention, a positive pole (anode) may be the pole of the heat exchanger  5  and a negative pole (cathode) may be the pole of the electric pole  16 . 
         [0205]    To supply the electric power to the heat exchanger  5 , more specifically, to the pallet  7 , a power supplier  80  may include a moving contact  81 . In detail, the moving contact  81  may be distant from the pallet  7  while the pallet  7  is conveyed. The moving contact  81  may be closer to the pallet  7  to make contact with the pallet  7  for the plasma reaction. An air cylinder  86  may be provided to realize such the moving contact  81 . Accordingly, the moving contact  81  may be moved forwardly and backwardly by the operation of the air cylinder  86  basically. 
         [0206]    In other words, the moving contact  81  may selectively be in contact with the contact  7   d  of the pallet  7 . The moving contact  81  and the contact  7   d  of the pallet  7  may include plane surfaces, respectively. The plane surfaces may make surface-contact with each other, to supply the electric power more stably. 
         [0207]    Also, the moving contact  81  may be elastically supported. That is, when the moving contact  81  is in contact with the pallet  7  after a movement, the moving contact  81  may move further for a predetermined distance. The distance may be a distance that enables the contact to be compensated reliably by the elastic support. As a result, even if a vibration is generated, the elastic support may perform the stable supply of the electric power. 
         [0208]    Meanwhile, the power supplier  80  may include a switch  82 ′ or a switch member. The switch  82  selectively supplies the electric power to the moving contact  81  based on elastic deformation of the moving contact  81 . 
         [0209]    Specifically, the power supplier  80  may include a contact receiving part  82  to receive the moving contact  81 . The moving contact  81  may be elastically supported by an elastic member  81 ′ within the contact receiving part  82 . The elastic member may be a spring provided in the contact receiving part  82 . Accordingly, the contact receiving part  82  may move forwardly even when the moving contact contacts with the pallet contact. In this instance, the moving contact  81  may not move forwardly and the elastic member provided between the moving contact and the contact receiving part may be elastically transformed. 
         [0210]    The switch member  82 ′ may be a shaft. An end of the switch member may be selectively and electrically connected with the moving contact and the other end of the switch member may be connected with a power line (not shown). 
         [0211]    In this instance, the switch member may be electrically connected with the moving contact, when the moving contact  81  is advancing by the elastic force. Accordingly, the electric power may be supplied more stably. 
         [0212]    A safety plate  85  may be provided behind the contact receiving part  82 . Also, a plurality of connecting members  84  may be provided to determine the forward and backward moving distance, the position and the height thereof. The connecting members may be block-shaped. Specifically, the blocks may include horizontal blocks  84   a  and vertical blocks  85   b.    
         [0213]    In this instance, a through hole  87  may be formed in one of the horizontal blocks and the electric power may be supplied to the moving contact  81  via a power line passing through the through hole. 
         [0214]    Meanwhile, the connecting member  84  may be disposed between the safety plate  85  and the moving contact receiving part  82 . The connecting member  84  may perform an insulation function for both of them. For that, the connecting member may be formed of a ceramic material. 
         [0215]      FIG. 11  shows an entire appearance of the power supplier  80 . The power supplier  80  may include a base  89   a,  a moving generation part  89   b  and a moving contact part  89   c . Specifically, the base  89   a  and the moving generation part  89   b  may not be exposed outside. As a result,  FIG. 10  shows that only the moving contact part  89   c  is exposed within the chamber. In other words, a line referenced to as ‘ 1   a ’ means a boundary between the inside of the chamber and an internal wall of the chamber. 
         [0216]    Such the configuration may minimize the area occupied by the power supplier  80  provided in the chamber. In other words, the moving generation part  89   b  is not exposed to the inside of the chamber and the moving contact part may be moved stably accordingly. 
         [0217]    The power supplier  80  may include a safety switch  83 . Such a safety switch  83  may be functioned as a switch configured to apply or block an electric power according to the movement of the moving contact part. In other words, the safety switch  83  may be moved by the safety plate  85 . When the moving contact part advances forwardly, the safety switch  83  may not contact with the safety plate. Reversely, when the moving contact part retreats, the safety plate may contact with the safety switch to retreat the safety switch. 
         [0218]    As a result, the safety switch  83  may be movable between a front position and a rear position by the safety plate  85 . Specifically, the switch member  83   a  of the safety switch  83  may be moved between the front position and the rear position by the safety plate  85 . 
         [0219]    In the rear position of the safety switch, the power supplier  80  blocks the electric power applied to the moving contact part. As a result, even when the controller controls the power supplier to apply the electric power, the power supply can be substantially blocked by the safety switch. Accordingly, more stable and safe power supply may be enabled. 
         [0220]    Meanwhile, there may be formed a region having the electric power applied thereto in the moving contact part  89   a , When the moving contact part is exposed to the inside of the chamber, a functional film might be formed on a surface of the moving contact part  89   a.  To prevent the unnecessary functional film, a cover  89   d  may be provided. 
         [0221]    The cover may cover a top and sides, that is, a top surface and lateral surfaces of the moving contact part. A front surface of the moving contact part may be open to move the moving contact. Also, a rear surface of the moving contact part may be closed but the rear surface faces the inner wall la. Accordingly, the rear surface needs not be closed. 
         [0222]    A sealing member  88  may be provided between the moving contact part and the moving generation part. In other words, sealing may be provided to the inner wall la, to partition the chamber inside and the inner wall. As a result, the sealing may be performed by using an insulating material, to prevent the electric power applied to the moving contact part from being applied to the moving generation part. 
         [0223]    According to the embodiment of the invention described above, the control unit  500  may appropriately control the precursor supply unit  400 , the reaction gas supply unit  300 , the cleaning gas supply unit  200  and the exhaustion unit  100  connected with the single chamber  1 . Accordingly, the functional film may be formed on the heat exchanger  5 . Furthermore, the multi-functional precursor having the corrosion resistance, hydrophilicity and antibiotic functions at the same time may be used. Accordingly, the corrosion resistant, hydrophilic and antibiotic functional film may be formed in the single chamber  1  at one time. 
         [0224]    The heat exchanger is presented in the embodiments mentioned above and the embodiments of the invention are not limited to the heat exchanger. For example, a side mirror for a vehicle can be applied to the embodiments of the invention. 
         [0225]    Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to affect such feature, structure, or characteristic in connection with other ones of the embodiments. Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.