Patent Document

BACKGROUND 
       [0001]    1. Field 
         [0002]    The present invention relates to a metal capacitor and a manufacturing method thereof, and more particularly, to a metal capacitor in which an electric conductivity is significantly improved. 
         [0003]    2. Background 
         [0004]    An aluminum electrolytic capacitor is used to smooth a power output from a power circuit to be a predetermined value, or is used as a low frequency bypass. Hereinafter, a method of manufacturing the aluminum electrolytic capacitor will be briefly described. 
         [0005]    An etching process of etching the surface of an aluminum foil is performed to enlarge a surface area of the aluminum foil and thereby increase an electric capacity. When the etching process is completed, a forming process of forming a dielectric substance on the aluminum foil is performed. When cathode and anode aluminum foils are manufactured through the etching process and the forming process, a slitting process of cutting the manufactured aluminum foil and a separator by as long as a desired width based on the length of a product is performed. When the slitting process is completed, a stitching process of stitching an aluminum lead patch, which is a lead terminal, to the aluminum foil is performed. 
         [0006]    When the slitting of the aluminum foil and the separator is completed, a winding process of disposing the separator between the anode aluminum foil and the cathode aluminum foil, and then winding the separator and the aluminum foils in a cylindrical shape and attaching a tape thereto, so as to not be unwounded. When the winding process is completed, an impregnation process of inserting the wound device into an aluminum case and injecting an electrolyte is performed. When the injecting of the electrolyte is completed, a curing process of sealing the aluminum case using a sealing material is performed. When the curling process is completed, an aging process of restoring a damage to the dielectric substance is performed. Through this, the assembly of the aluminum electrolytic capacitor is completed. 
         [0007]    Due to the current development in digitalization and thinness of electronic devices, when applying the conventional aluminum electrolytic capacitor, there are some problems as follow. 
         [0008]    Since the aluminum electrolytic capacitor uses the electrolyte, an electric conductive is comparatively low and thus a lifespan of the aluminum electrolytic capacitor is reduced in a high frequency area. Also, there are some constraints on improvement of reliability, a high frequency response, a low equivalent series resistance (ESR), and impedance. Also, due to a comparatively high ripple pyrexia, there are some constraints on stability and environments, such as fuming and firing. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention is conceived to solve the above-described problems and thus provides a metal capacitor in which an electric conductivity is improved by about 10,000 to 1,000,000 folds by applying a metal material for an electrolyte, in comparison to when using a conventional electrolyte or an organic semiconductor, a multi-layer metal capacitor using the metal capacitor, and a manufacturing method thereof. 
         [0010]    The present invention also provides a metal capacitor which can improve a miniature, a low equivalent series resistance (ESR), a reduction in a ripple pyrexia, a long life, a heat-resistant stability, non-fuming, non-firing, and environment by using a metal material for an electrolyte, and a manufacturing method thereof. 
         [0011]    According to an aspect of the present invention, there is provided a metal capacitor including: a metal member including a plurality of grooves on its one surface; a metal oxide film being formed on the metal member; an insulating layer being formed on the metal oxide film to insulate the metal member and the sealing electrode member; and a sealing electrode member being formed on the metal oxide film to fill in the plurality of grooves. 
         [0012]    According to another aspect of the present invention, there is provided a method of manufacturing a metal capacitor, the method including: masking another surface of a metal member using a resin film; forming a plurality of grooves on one surface of the metal member by using a direct current (DC) etching, when the other surface of the metal member is masked; forming a metal oxide film o the metal member by using an anodizing way, when the plurality of grooves is formed on the metal member; forming an insulating layer on the sealing electrode member and the metal oxide film by using a chemical vapor deposition (CVD); and forming a sealing electrode member to fill in the plurality of grooves formed on the metal member by using an electroless planting or an electroplating. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements wherein: 
           [0014]      FIGS. 1A through 1E  illustrate a metal capacitor according to a first embodiment of the present invention; 
           [0015]      FIGS. 2A through 2C  illustrate another embodiment of the metal capacitor shown in  FIG. 1A ; 
           [0016]      FIGS. 3A through 3C  illustrate still another embodiment of the metal capacitor shown in  FIG. 1A ; 
           [0017]      FIGS. 4A through 4D  illustrate a metal capacitor according to a second embodiment of the present invention; and 
           [0018]      FIGS. 5A through 5D  illustrate a metal capacitor according to a third embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
     First Embodiment 
       [0019]    Hereinafter, a configuration of a metal capacitor according to a first embodiment of the present invention will be described with reference to the accompanying drawings. 
         [0020]      FIG. 1A  is a top view of the metal capacitor according to the first embodiment of the present invention.  FIGS. 1B through 1E  are cross-sectional views cut along A 1 -A 2  line of the metal capacitor shown in  FIG. 1A . 
         [0021]    As shown in  FIGS. 1A through 1E , a metal capacitor  10  includes a metal member  11 , a metal oxide film  12 , a sealing electrode member  13 , and an insulating layer  14 . Hereinafter, a configuration thereof will be described. 
         [0022]    The metal member  11  includes a plurality of grooves  11   a  on its one surface. The metal oxide film  12  is formed on the metal member  11 . The sealing electrode member  13  is formed on the metal oxide film to fill in the plurality of grooves. The insulating layer  14  is formed on the metal oxide film  12  to insulate the metal member  11  and the sealing electrode member  13 . The insulating layer  14  can be formed after forming the sealing electrode member  13 . Thus, the insulating layer  15  is formed on a metal oxide film  12  and/or the sealing electrode member  13 . 
         [0023]    Hereinafter, each configuration of the metal capacitor  10  according to the first embodiment will be further described in detail. 
         [0024]    The metal member  11  is formed in a foil or a planar shape and uses any one of aluminum (Al), niobium (Nb), tantalum (Ta), zirconium (Zr), and titanium (Ti). The metal oxide film  12  is formed on the whole surface of the metal member  11  as shown in  FIGS. 1C through 1D , or is formed on one surface where the plurality of grooves is formed as shown in  FIG. 1E . The metal oxide film  12  uses any one of alumina(Al 2 O 3 ), niobium pentoxide(Nb2O5), niobium monoxide (NbO), tantalum pentoxide(Ta205), zirconium dioxide(ZrO2), and titanium dioxide(TiO2). 
         [0025]    The sealing electrode member  13  may use any one of aluminum (Al), copper (Cu), zinc (Zn), silver (Ag), nickel (Ni), tin (Sn), indium (In), palladium (Pd), platinum (Pt), cobalt (Co), ruthenium (Ru), and gold (Au). A plurality of first external electrodes  21  as shown in  FIG. 1D  or a plurality of second external electrodes  22  as shown in  FIG. 1E  is further provided to be connected to the metal member  11  and the sealing electrode member  13 . The plurality of first external electrodes  21  may be connected to the metal member  11  and the sealing electrode member  13  respectively to thereby use the metal capacitor  10  regardless of a polarity. One of the plurality of second external electrodes  22  is an anode electrode and another thereof is a cathode electrode, which is different from the plurality of first external electrodes  21 . The plurality of second external electrodes  22  is connected to the metal member  11  and the sealing electrode member  13  respectively to thereby enable the metal capacitor to have the polarity. Specifically, when the second external electrode  22  connected to any one of the metal member  11  and the sealing electrode member  13  is the anode electrode, the other second external electrode is the cathode electrode. Conversely, when the second external electrode  22  connected to any one of the metal member  11  and the sealing electrode member  13  is the cathode electrode, the other second external electrode  22  is the anode electrode. 
         [0026]    As shown in  FIG. 1D , a seed electrode layer  15  is interposed between the metal oxide film  12  and the sealing electrode member  13  to fill in and form the sealing electrode member  13  in the plurality of grooves  11   a  of the metal member  11 . The seed electrode layer  15  uses any one of aluminum (Al), copper (Cu), zinc (Zn), silver (Ag), nickel (Ni), tin (Sn), indium (In), palladium (Pd), platinum (Pt), cobalt (Co), ruthenium (Ru), and gold (Au). The seed electrode layer  15  is provided to make the sealing electrode member  13  be readily filled in the plurality of grooves  11   a  of the metal member  11  and thereby have stronger adhesiveness with the metal oxide film  12 . 
         [0027]    The insulating layer  14  is formed on the metal oxide film  12  and the sealing electrode member  13  to surround the side of the sealing electrode member  13  to thereby electrically insulate the metal member  11  and the sealing electrode member  13 . The molding member  31  is provided to seal the metal member  11  using a molding material such as epoxy molding compound (EMC). When molding the metal member  11 , the molding member  31  molds the metal member  11  in any one of a planar shape and a cylindrical shape. When molding the metal member  11  in the planar shape, the molding member packages the metal member  11  or a chip in a surface mounting type. When molding the metal member  11  in the cylindrical shape, the molding member  31  molds and winds the metal member  11  to be packaged as a lead type. 
         [0028]    Hereinafter, another embodiment of the metal capacitor  10  shown in  FIGS. 1A through 1E  will be described with reference to the accompanying drawings. 
         [0029]      FIGS. 2A through 2C  illustrate another embodiment of the metal capacitor shown in  FIG. 1A .  FIG. 2A  is a top view of the metal capacitor.  FIGS. 2B and 2C  are cross-sectional views cut along B 1 -B 2  line of the metal capacitor shown in  FIG. 2A . 
         [0030]    As shown in  FIGS. 2A through 2C , according to the other embodiment of the metal capacitor  10 , the plurality of grooves  11   a  formed on the metal member  11  may be formed in the shape of a polygon such as a square or a circle shown in  FIG. 1A . The metal member  11  that includes a plurality of square grooves  1   b  may include an electrode withdrawing portion m as shown in  FIGS. 2B and 2C . The electrode withdrawing portion m is formed by extending the metal member  11  by the electrode withdrawing portion m. The electrode withdrawing portion m is provided to more readily connect the first external electrode  21  or the second external electrode to the metal member  11 . The metal member  11  formed with the electrode withdrawing portion m is formed on the whole surface of the metal oxide film  12 , or is formed on one surface where the plurality of square grooves  11   b  is formed. 
         [0031]    Hereinafter, still another embodiment of the metal capacitor  10  shown in  FIGS. 1A through 1E  will be described with reference to the accompanying drawings. 
         [0032]      FIGS. 3A through 3C  illustrate still another embodiment of the metal capacitor  10  shown in  FIG. 1A .  FIG. 3A  is a top view of the metal capacitor.  FIGS. 3B and 3C  are cross-sectional views cut along C 1 -C 2  line of the metal capacitor shown in  FIG. 3A . 
         [0033]    As shown in  FIGS. 3A through 3C , according to still another embodiment of the present invention, the plurality of grooves  11   a  formed on the metal member  11  may be formed in the shape of a polygon such as a hexagon or a circle shown in  FIG. 1A . The metal member  11  that includes a plurality of hexagon grooves  11   a  may include at least one electrode withdrawing portion as shown in  FIGS. 3B and 3C . In  FIGS. 3B and 3C , the metal member  11  includes two electrode withdrawing portions m. The first external electrode  21  or the second external electrode may be connected to each of the electrode withdrawing portions m to thereby construct the metal capacitor having two terminals or three terminals. The metal oxide film  12  formed on the metal member  11  where at least one electrode withdrawing portion m is formed to construct the metal capacitor  11  having two terminals or three thermals includes the electrode withdrawing portion m and is formed on the whole surface or on one surface where the plurality of polygon grooves  11   c  is formed. 
       Second Embodiment 
       [0034]    Hereinafter, a configuration of a metal capacitor according to a second embodiment of the present invention will be described with reference to the accompanying drawings. 
         [0035]      FIGS. 4A through 4D  illustrate a metal capacitor according to a second embodiment of the present invention. 
         [0036]    As shown in  FIGS. 4A through 4D , metal capacitors  110 ,  120 ,  130 , and  140  according to the second embodiment are constructed as a plurality of single layer metal capacitance members  10   a.  Each of the plurality of single layer metal capacitance member  10   a  includes a metal member  11 , a metal oxide member  12 , a sealing electrode member  13 , and an insulating member  14 . Since configurations thereof are the same as the metal member  11 , the metal oxide film  12 , the sealing electrode member  13 , and the insulating layer  14  according to the first embodiment shown in  FIGS. 1A through 1E . Therefore, further detailed descriptions will be omitted herein. 
         [0037]    The metal capacitors  110 ,  120 ,  130 , and  140  constructed as the plurality of single layer metal capacitance member  10   a  according to the second embodiment will be sequentially described with reference to  FIGS. 4A through 4D . 
         [0038]    As shown in  FIG. 4A , the metal capacitor  110  according to the second embodiment includes the plurality of single layer metal capacitance members  10   a  and a plurality of external electrodes  21 . 
         [0039]    Each single layer metal capacitance member  10   a  includes the metal member  11 , the metal oxide film  12 , the sealing electrode member  13 , and the insulating layer  14 . The plurality of single layer metal capacitance members  10   a  is provided in parallel to contact with the sealing electrode member  13 . The metal oxide film  12  of each of the plurality of single layer metal capacitance members  10   a  is formed on the whole surface of the metal member  11 . As shown in  FIG. 4A , the plurality of first external electrodes  21  is connected to the plurality of single layer metal capacitance members  10   a  to thereby enable the metal capacitor  110  to be used regardless of a polarity. 
         [0040]    The metal capacitor  110  where the plurality of single layer metal capacitance members  10   a  is provided in parallel is connected to the plurality of second external electrodes  22  indicted by dotted lines in  FIG. 4A . One of the plurality of second external electrodes  22  is an anode electrode and another thereof is a cathode electrode. The plurality of second external electrodes  22  is connected to the metal capacitor to make the metal capacitor  110  have the polarity. One of the plurality of second external electrodes  22  is connected to the metal member  11  of each single layer metal capacitance member  10   a  and another thereof is connected to the contacting sealing electrode member  13 . 
         [0041]    A conductive adhesive member  16  is further interposed between the plurality of single layer metal capacitance members  10   a  to improve adhesiveness. The conductive adhesive member  16  uses adhesives such as a conductive solder paste and the like. The plurality of single layer metal capacitance members  10   a  further includes a molding member  31 . The molding member  31  molds the plurality of single layer metal capacitance members  10   a  in any one of a planar shape and a cylindrical shape. When molding the metal member  11  in the cylindrical shape, the molding member  31  winds and molds the plurality of single layer metal capacitance members  10   a.    
         [0042]    As shown in  FIG. 4B , the metal capacitor  120  according to the second embodiment includes the plurality of single layer metal capacitance members  10   a  and a plurality of first external electrodes  21 . The metal capacitor  120  shown in  FIG. 4B  has the same configuration as the metal capacitor  110  shown in  FIG. 4A  and thus further detailed description will be omitted herein. The difference therebetween is that the plurality of single layer metal capacitance members  10   a  is provided in parallel to make the metal members  11  contact with each other. Since the plurality of single layer metal capacitance members  10   a  is provided in parallel to make the metal members  11  contact with each other, the plurality of first external electrodes  21  is connected to the sealing electrode member  13  of each single layer metal capacitance member  10   a.  Also, when connecting the plurality of second external electrodes  22 , one thereof is connected to the sealing electrode member  13  of the single layer metal capacitance member  10   a  and another thereof is connected to the contacting metal member  11 . 
         [0043]    As shown in  FIG. 4C , the metal capacitor  130  according to the second embodiment includes a plurality of first parallel multi-layer bodies  110   a,  a plurality of second parallel multi-layer bodies  120   a,  and a plurality of second external electrodes  21 . 
         [0044]    The plurality of first parallel multi-layer bodies  110   a  is provided in parallel so that, among the plurality of single layer metal capacitance members  10   a,  the sealing electrode member  13  of an odd number th  single layer metal capacitance member  10   a  may contact with the sealing electrode member  13  of an even number th  single layer metal capacitance member  10   a.  The plurality of second parallel multi-layer bodies  120   a  is provided in parallel so that, among the plurality of single layer metal capacitance members  10   a,  the metal member  11  of the odd number th  single layer metal capacitance member  10   a  may contact with the metal member  11  of the even number th  single layer metal capacitance member  10   a.    
         [0045]    The plurality of first parallel multi-layer bodies  110   a  and the plurality of second parallel multi-layer bodies  120   a  constructed as above are provided in series/in parallel so that the metal member  11  of the even number th  single layer metal capacitance member  10   a  of the first parallel multi-layer  110   a  may contact with the sealing electrode member  13  of the odd number th  single layer metal capacitance member  10   a  of the second parallel multi-layer body  120   a.  Specifically, when the plurality of first parallel multi-layer bodies  110   a  and the plurality of second parallel multi-layer bodies  120   a  are provided in parallel, the metal capacitor  130  is provided in series/in parallel by sequentially providing in series the first parallel multi-layer body  110   a  and the second parallel multi-layer body  120   a.    
         [0046]    The plurality of first external electrodes  21  is connected to the metal member  11  of the odd number th  single layer metal capacitance member  10   a  of a first locating first parallel multi-layer body  110   a  among the plurality of first parallel multi-layer bodies  110   a  and the metal member  11  of the even number th  single layer metal capacitance member  10   a  of a last locating second parallel multi-layer body  120   a  among the plurality of second parallel multi-layer bodies  120   a.  The terms “odd number th ”, “even number th ”, “first”, and “last” are defied based on the first parallel multi-layer body  110   a  that is disposed at the lowest bottom shown in  FIG. 4C . For example, it is assumed that when the first parallel multiplayer body  110   a  disposed at the lowest bottom as shown in  FIG. 4C  is a first location, the single layer metal capacitance member  10   a  that is located in a lower place of the first locating first parallel multi-layer body  110   a  is an odd number th  location. 
         [0047]    The plurality of first parallel multi-layer bodies  110   a  and the plurality of second parallel multi-layer bodies  120   a  connected to the plurality of first external electrodes  21  are connected to the plurality of second external electrodes  22  indicated by dotted lines as shown in  FIG. 4C . One of the plurality of second external electrodes  22  is an anode electrode and another thereof is a cathode electrode. One of the plurality of second external electrodes  22  is connected to the metal member  11  of each of the plurality of single metal capacitance members  10   a  of the plurality of first parallel multi-layer bodies  110   a  and the other is connected to the contacting sealing electrode member  13 . The plurality of second parallel multi-layer bodies  120   a  connected to the plurality of first external electrodes  21  is connected to the plurality of second external electrodes  22  indicated by dotted lines shown in  FIG. 4D . One of the plurality of second external electrodes  22  is connected to the sealing electrode member  13  of each of the plurality of single metal capacitance members  10   a  of the plurality of second parallel multi-layer bodies  120   a  and the other is connected to the contacting metal member  11 . 
         [0048]    Since the plurality of first parallel multi-layer bodies  110   a  and the plurality of second parallel multi-layer bodies  120   a  are connected to the plurality of second external electrodes  22  respectively, the metal capacitor  130  shown in  FIG. 4C  may be constructed to apply the plurality of first parallel multi-layer bodies  110   a  or the plurality of second parallel multi-layer bodies  120   a  as a single capacitor device. The metal capacitor  130  further includes a conductive adhesive member  16  interposed between each of the plurality of first parallel multi-layer bodies  110   a  and each of the plurality of second parallel multi-layer bodies  120   a.  In the plurality of first parallel multi-layer bodies  110   a  and the plurality of second parallel multi-layer bodies  120   a  that further includes the conductive adhesive member  16 , the metal oxide film  12  of each single layer metal capacitance member  10   a  is formed on the whole surface of the metal member  11 . 
         [0049]    As shown in  FIG. 4D , the metal capacitor according to still another embodiment of the second embodiment of the present invention includes the plurality of single layer metal capacitance members  10   a  and the plurality of first external electrodes  21 . 
         [0050]    As shown in  FIG. 4D , the plurality of single layer metal capacitance members  10   a  is provided in series to make each metal member  11  contact with sealing electrode member  13 . The plurality of first external electrodes  21  is connected to the metal members  11  of the first and the last single layer metal capacitance members  10   a  among the plurality of single layer metal capacitance members  10   a.    
         [0051]    The plurality of single layer metal capacitance members  10   a  connected to the plurality of first external electrodes  21  is connected to the plurality of second external electrodes  22 , one of which is an anode electrode and another which is a cathode electrode. One of the plurality of second external electrodes  22  is connected to the metal member  11  of the first single layer metal capacitance member  10   a  among the plurality of single layer metal capacitance members  10   a  and the other thereof is connected to the sealing electrode member  13  of the last single layer metal capacitance member  10   a.  As described above, the metal oxide film  12  of each of the plurality of single layer metal capacitance members  10   a  constituting the metal capacitor  140  wherein the plurality of single layer metal capacitance members  10   a  is provided in series is formed on the whole surface of the metal member  11 . 
       Third Embodiment 
       [0052]      FIGS. 5A through 5D  illustrate a metal capacitor according to a third embodiment of the present invention. 
         [0053]    Metal capacitors  210 ,  220 ,  230 , and  240  as shown in  FIGS. 5A through 5D , have the same configuration as the metal capacitor  110 ,  120 ,  130 , and  140  according to the second embodiment of the present invention as shown in  FIGS. 4A through 4D . In particular, the metal capacitor  230  shown in  FIG. 5C  is constructed by providing a plurality of first parallel multi-layer bodes  210   a  and a plurality of second parallel multi-layer bodies  220   a  in series like the plurality of first parallel multi-layer bodies  110   a  and the plurality of second parallel multi-layer bodies shown in  FIG. 4C . 
         [0054]    The metal oxide film  12  of each single metal capacitance member  10  constituting the metal capacitors  210 ,  220 ,  230 , and  240  according to the third embodiment of the present invention that have the same configuration as the metal capacitors  110 ,  120 ,  130 , and  140  according to the second embodiment of the present invention is formed by a different way from the metal oxide film  12  of each single metal capacitance member  10   a  of the metal capacitors  110 ,  120 ,  130 , and  140  according to the second embodiment shown in  FIGS. 4A through 4D . Specifically, as shown in  FIGS. 4A through 4D , the metal capacitors  110 ,  120 ,  130 , and  140  form the meal oxide film  12  on the whole surface of the metal member. On the other hand, as shown in  FIGS. 5A through 5D , the metal capacitors  210 ,  220 ,  230 , and  240  form the metal oxide film  12  on one surface of the metal member  11  where the plurality of grooves  11   a  is formed. 
         [0055]    Since the metal oxide film  12  is formed on one surface of the metal member  11  where the plurality of grooves  11   a  is formed, the metal capacitors  210 ,  220 ,  230 , and  240  according to the third embodiment of the present invention may reduce noise components such as a parasitic capacitance and the like caused by the metal oxide film  12  when providing the plurality of single layer metal capacitance members  10   a.    
         [0056]    Hereinafter, a method of manufacturing a metal capacitor according to the present invention constructed as above will be described with reference to  FIGS. 1A through 1E . 
         [0057]    Another surface of the metal member  11  is masked using a resin film (not shown) to form a plurality of grooves  11   a  by etching only one surface of the metal member  11 . In addition to a scheme of attaching a resin-based film onto the other surface of the metal member  11  and thereby masking, the masking process uses a scheme of applying photoresist and baking to mask the other surface of the metal member. When forming the electrode withdrawing portion m on the metal member  11  as shown in  FIGS. 2B  or  3 B during the process of masking the other surface of the metal member  11 , only one surface of the metal member  11  corresponding to the electrode withdrawing portion m is masked. 
         [0058]    When the other surface of the metal member  11  is masked, the plurality of grooves  11   a  is formed to be arranged on one surface of the metal member  11  by using a direct current (DC) etching as shown in  FIG. 1B . Here, the DC etching sprays insulating oil-based ink (not shown) on the surface of aluminum foil to be etched. In this instance, an ink spray region may be limited using screen printing to thereby secure an exposure portion. The DC etching dries the aluminum foil sprayed with the insulating oil-based ink in the temperature of about 50° C. through 200° C., generates an anodizing film in the aqueous solution of ammonium adipate 15% with 10 through 20V in the temperature of 70° C. through 90° C. The DC etching places the aluminum foil formed with the anodizing film in an organic solvent such as ethanol, acetone, benzene and the like to thereby remove the insulating oil-based ink and it again in an deionized water. Next the aluminum foil is etched. 
         [0059]    During the etching process using the DC etching, the plurality of grooves  11   a  is formed in the shape of a circle as shown in  FIG. 1   a,  or is formed in the shape of a polygon such as the square groove  11   b  or the hexagonal groove  11   c  as shown in  FIG. 2   a  or  FIG. 3   a.  When forming the plurality of grooves  11   a  in various shapes in cylindrical form, the diameter thereof is about 1 μm to about 100 μm. The etching scheme uses an alternate current (AC) etching or a wet etching in addition to the DC etching. 
         [0060]    When the plurality of grooves  11   a  is formed on the metal member  11 , the metal oxide film  12  is formed on the metal member  11  by using an anodizing method. The process of forming the metal oxide film  12  forms the metal oxide film  12  on the whole surface of the metal member  11  as shown in  FIG. 1C ,  2 B, or  3 B, or only one surface where the plurality of grooves is formed, as shown in  FIG. 1E ,  FIG. 2C , or  FIG. 3C . 
         [0061]    The anodizing method removes a boiling process, proceeds first oxidation in an aqueous solution of boric and boric acid-ammonium with 150 voltages and proceeds a plurality of oxidations with changing the concentration and the voltage of the aqueous solution. The anodizing method performs a thermal treatment in the predetermined temperature to perform a reforming process. Also, the anodizing method forms a metal oxide film with restraining generation of a hydroxide film to the maximum by increasing the first and the second current density 1.5 through three times. The anodizing method may perform a by-product treatment in order to remove the by-product generated in the reforming process and further proceed the reforming process and the thermal treatment depending on the requirement of a user. Also, the anodizing method proceeds a predetermined cleaning process in order to clean boric acid or phosphoric acid. 
         [0062]    As shown in  FIG. 1C , the insulating layer  14  is formed on the metal oxide film  12  and/or a sealing electrode member  13  by using a Chemical Vapor Deposition (CVD) as shown in  FIG. 1C . Although the CVD is used herein, it is possible to apply any one of a dipping process using an insulating resin or insulating ink, a spray process using ink-jet printing or screen printing, and a stamping process. 
         [0063]    A sealing electrode member  13  is formed to fill in the plurality of grooves  11   a  formed on the metal member  11  via a plurality of seed electrode layers by using an electroplating, or an electroless plating as shown in  FIG. 1D . In the seed electrode layer, a predetermined amount of sulfuric acid palladium applies as an activator. Also, it proceeds a cleaning process in order remove the activator after passing a predetermined time. 
         [0064]    A process of forming the seed electrode layer  15  to more readily fill in the sealing electrode member  13  in the plurality of grooves  11   a  is further provided between a process of forming the sealing electrode member  13  and a process of forming the metal oxide film  12 . Forming of the seed electrode layer  15  uses any one of CVD, metal organic CVD (MOCVD), and molecular beam epitaxy (MBE). However, the seed electrode layer  15  may be removed and not be applied depending on requirement of the user. 
         [0065]    The plurality of first external electrodes  21  is connected to the metal member  11  or the sealing electrode member  13  as shown in  FIG. 1D . In this process, the plurality of first external electrodes  21  is connected to the plurality of second external electrodes  22  as shown in  FIG. 1E . The plurality of second external electrodes  22  is connected to the metal member  11  and the sealing electrode member  13  respectively. One of the plurality of second external electrodes  22  is an anode electrode and another there is a cathode electrode. As shown in  FIG. 1E , a process of forming the conductive adhesive member  16  to more readily connect the plurality of first external electrodes  21  or the plurality of second external electrodes  22  to the metal member  11  or the sealing electrode member  13  is further provided between the process of forming such electrode and a process of forming the insulating layer  14 . Forming of the conductive adhesive member  16  uses any one of metal adhesives, solder paste, electroless plating, and electrode plating. 
         [0066]    As shown in  FIG. 1E , when the plurality of first external electrodes  21  or the plurality of second external electrodes is connected, the metal member  11  is sealed using a sealing member to externally expose the plurality of first external electrodes  21  or the plurality of second external electrodes  22 . The process of sealing the metal member  11  using the sealing member seals the metal member  11  using a molding material or a cover member with an empty inside. Through this, the metal capacitor  10  is manufactured. 
         [0067]    According to the present invention, it is possible to improve an electric conductivity by about 10,000 to 1,000,000 folds by applying a metal material for an electrolyte, in comparison to when using a conventional electrolyte or an organic semiconductor. Also, since the serial multi-laying is possible, high-voltage is enabled. Also, since the polarity has no directivity, a relatively higher safety is provided. Also, it is possible to improve a miniature, a low equivalent series resistance (ESR), a reduction in a ripple pyrexia, a long life, a heat-resistant stability, non-fuming, non-firing, and environment. 
         [0068]    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 effect such feature, structure, or characteristic in connection with other ones of the embodiments. 
         [0069]    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.

Technology Category: y