Abstract:
An electronic part is made from a laminated object including stacked abutting ceramic green sheets each carrying an electrically conductive paste having a contact portion in proximity to an edge of the sheet. The laminated object is fired to form a laminated body including ceramic insulator layers abutting electrically conductive internal electrode layers including contact segments in proximity to a side of the object. The body is then processed so the contact segments are exposed on the side of the object. Then an external electrode is formed on the polished body where the contact segment is exposed by using a dry process so the external electrode and the contact segment abut to establish an electric contact between the external electrode and the contact segments. The firing step causes the paste to move relative to the edges of the sheets so the contact segments are displaced relative to the edges of the sheets. The processing step results in a reduction of the displacement of the contact segments relative to the edges of the sheets so the contact segments are displaced relative to the edges of the sheets by a distance to provide an anchoring effect for the external electrode when it is formed by the dry process.

Description:
This application is a Continuation application Ser. No. 09/010,833 filed Jan. 22, 1998. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an electronic part such as a laminated ceramic capacitor and a manufacturing method thereof. 
     2. Description of the Prior Art 
     A laminated ceramic capacitor, which is an example of laminated electronic part, is known as a chip-like electronic part. This laminated capacitor consists of a laminated body, which has a rectangular parallelepiped form and is composed of alternately laminated electrically conductive internal electrode layers and ceramic insulator layers, and external electrodes which are conductively connected to the internal electrodes and are formed at both ends of the laminated body. 
     For manufacturing this laminated ceramic capacitor, a method described below is known: 
     First, an electrically conductive paste, which forms the internal electrodes, is applied to ceramic green sheets composed of a dielectric ceramic material in a predetermined pattern. Ag, Pd, Ag—Pd, Ni or Cu, for example, is used as the electrically conductive paste. 
     Then, a sheet laminated body is formed by stacking a plurality of the ceramic green sheets. Thereafter, this sheet laminated body as a whole is bonded under pressure. Further, a laminated chip, which has a rectangular parallelepiped form, is obtained by cutting the sheet laminated body in predetermined width and length. The sheet laminated body is cut so that the internal electrodes are exposed on cut surfaces. 
     Then, the laminated chip is heated to approximately 300° C. in atmosphere for de-binding treatment, to vaporize an organic binder component contained on the laminated chip. Thereafter, a laminated body, which is made of a ceramic material, is obtained by firing the laminated chip at approximately 1300° C. in atmosphere. 
     Finally, external electrodes, which are conductively connected to the internal electrodes, are formed at both the ends of the laminated body. The external electrodes are formed by a dry process, which is typically represented by the vacuum deposition and sputtering. Thin films of metal such as Ag, Sn, Cr or Ni are formed at both ends of the laminated body by this process. The dry process is selected for the purpose mainly of forming the external electrodes into thin films, thereby preventing the laminated body from being cracked or delaminated due to stress, etc. applied by the external electrodes. 
     In such a manufacturing method, when firing the laminated body, an oxide film may be formed or various contaminants may adhere onto surfaces of the internal electrodes which are exposed to surfaces of the laminated body. Further, internal electrodes may protrude or are depressed from the surfaces of the laminated body since the electrically conductive paste and the ceramic green sheets have different shrinkage coefficients. 
     Accordingly, an adhesion property is degraded between the external electrodes and the internal electrodes, thereby making the external electrodes liable to peel off. Further, the oxide film degrades electrical conductivity between the external electrodes and the internal electrodes. Furthermore, the external electrodes with thin film thickness have low step coverage and are liable to crack. Cracks allow moisture contained in atmosphere to penetrate into the electronic part, and lower its water resistance, reliability and so on. 
     SUMMARY OF THE INVENTION 
     The present invention has been achieved in view of the circumstances described above, and has a primary object to provide an electronic part with high precision, and is excellent in durability, water resistance and reliability as well as a manufacturing method thereof by enhancing an adhesion property between the internal electronic part and the external electronic part. 
     A second object of the present invention is to provide an electronic part which substantially prevents external electrodes from peeling off a main body of the electronic part, thereby being excellent in durability, water resistance and reliability as well as a manufacturing method thereof. 
     For accomplishing the primary object, the electronic part according to the present invention is configured as an electronic part including a laminated body which comprises electrically conductive internal electrode layers and ceramic insulator layers, and external electrodes composed of thin films which are formed by a dry process at predetermined locations of surfaces of said laminated body including locations where said internal electrodes are exposed and which are conductively connected to said internal electrode layers, and characterized in that at least said predetermined locations of the surface of said laminated body have a predetermined surface roughness. 
     This electronic part is capable of preventing the external electrodes from peeling off the laminated body owing to an anchor effect since the surfaces of the laminated body have the predetermined surface roughness. Further, the electronic part enhances a step coverage of the external electrodes. 
     In a preferable embodiment of the present invention, the step coverage is further enhanced by limiting a protruding height of the internal electrodes from the surface of the laminated body within a predetermined value. Similarly, the step coverage is enhanced by limiting a depression depth of the internal electrodes from the surface of the laminated body within a predetermined value. 
     Furthermore, the manufacturing method of the electronic part described above according to the present invention comprises forming (1) a laminated body including electrically conductive internal electrode layers and ceramic insulator layers by firing a laminated object composed of an electrically conductive paste and ceramic green sheets, and (2) external electrodes composed of thin films conductively connected to said internal electrodes at locations of surfaces of said laminated body including locations where said internal electrodes are exposed, and is characterized mainly in that the method comprises at least the predetermined locations of the surfaces of said laminated body are polished after the the laminated body is formed. 
     This manufacturing method of the electronic part makes it possible to prevent the external electrodes from peeling off the laminated body under an anchor effect since a predetermined surface roughness is obtained on the surfaces of the laminated body during the polishing step. Furthermore, the polishing step eliminates an oxide film and contaminant since surfaces of the internal electrodes, which are exposed on the surfaces of the laminated body are cut during the polishing. Accordingly, the manufacturing method enhances an adhesion property between the internal electrodes and the external electrodes. 
     In a preferable embodiment wherein a protruding height of said internal electrodes from the surfaces of said laminated body is limited within a predetermined value at the polishing step, a step coverage is further enhanced. The step coverage is further enhanced by limiting a depression depth of said internal electrodes from the surface of said laminated body within a predetermined value. 
     For accomplishing the primary object described above, the manufacturing method according to the present invention comprises a step to form a laminated body which comprises electrically conductive internal electrode layers and ceramic insulator layers by firing a laminated object composed of an electrically conductive paste and ceramic green sheets, and a step to form external electrodes composed of thin films which are conductively connected to said internal electrodes by a dry process at predetermined locations of surfaces of said laminated body including at least locations where said internal electrodes are exposed, and is characterized mainly in that the method comprises a step to form electrically conductive intermediate layers at least on the predetermined locations of the surfaces of said laminated body after the step to form said laminated body. 
     Owing to the intermediate layers, this manufacturing method enhances an adhesion property between the external electrodes and the laminated body even when the internal electrodes protrude or depress from the surfaces of the laminated body, and moderates stress applied by the external electrodes. 
     In a preferable embodiment of the present invention, the adhesion property between the internal electrodes and the external electrodes can be enhanced by configuring the intermediate layer formation step so as to comprise a step to apply a suspension containing a dispersed metal to the predetermined locations, a step to fuse the metal by heating the locations where the suspension is applied and a step to harden the metal by stopping the heating. 
     For accomplishing the primary object described above, the electronic part according to the present invention comprises a laminated body which comprises electrically conductive internal electrode layers and ceramic insulator layers, and external electrodes composed of thin films which are formed by a dry process at predetermined locations of surfaces of said laminated body including locations where said internal electrodes are exposed and which are conductively connected to said internal electrodes, and is characterized in that said external electrodes are made of a material which has a fusion point higher than that of said internal electrodes. 
     Further, the manufacturing method of the electronic part described above according to the present invention comprises a step to form a laminated body which comprises electrically inductive internal electrode layers and ceramic insulator layers by firing the laminated object composed of an electrically conductive paste and ceramic green sheets, and a step to form external electrodes composed of thin films conductively connected to said internal electrodes by a dry process at predetermined locations of the surfaces of said laminated body including at least locations where said internal electrodes are exposed, and is characterized in that said external electrodes are made of a material which has a fusion point higher than that of said internal electrodes. 
     This manufacturing method allows oxide films formed on surfaces of the internal electrodes to be decomposed since the surfaces of the internal electrodes which are exposed to the surfaces of the laminated body are fused at the step to form the external electrodes by the dry process. Accordingly, this method is capable of enhancing an adhesion property between the external electrodes and the internal electrodes. 
     For accomplishing the primary object, the electronic part according-to the present invention consists of a laminated body which comprises electrically conductive internal electrode layers and ceramic insulator layers, and external electrodes composed of thin films which are formed by a dry process at predetermined locations of surfaces of said laminated body including locations where said internal electrodes are exposed and which are conductively connected to said internal electrodes, and is characterized in said external electrodes are formed so as to have film thickness thicker than that of other locations at the locations where said internal electrodes are exposed. 
     A manufacturing method of the electronic part described above according to the present invention comprises a step to form a laminated body which comprises electrically conductive internal electrode layers and ceramic insulator layers by firing a laminated object composed of an electrically conductive paste and ceramic green sheets, and a step to form external electrodes composed of thin films conductively connected to said internal electrodes by a dry process at locations of surfaces of said laminated body including at least locations of the surface of said laminated body where said internal electrodes are exposed, and is characterized in that said external electrodes are formed so as to have film thickness thicker than that of other locations at the locations where said internal electrodes are exposed. 
     This manufacturing method enhances a step coverage of the external electrodes, thereby improving an adhesion property between the external electrodes and the internal electrodes even when the internal electrodes protrude from the surfaces of the laminated body by firing the laminated object. 
     In a preferable embodiment of the present invention, said external electrodes are formed by a dry process with a mask which has apertures formed at locations corresponding to the predetermined locations of the surfaces of the laminated body and film formation retarder members for reducing a film forming rate in the apertures. This method makes it possible to manufacture electronic parts, which have a high adhesion property between external electrodes and internal electrodes as described above. 
     For accomplishing the second object, the electronic part according to the present invention comprises a unit element which has nearly a rectangular parallelopiped form, and external electrodes which are formed at predetermined locations ranging from a first surface where said internal electrodes are exposed to second surfaces adjacent to said first surface, and is characterized mainly in that said external electrodes have film thickness which increases from ends of said external electrodes on said second surfaces toward said first surface, and a surface of the end of said external electrode on said second surface intersects with said second surface at an angle not larger than a predetermined angle. 
     The electronic part according to the present invention wherein the external electrodes have a film thickness on the second surface which is smaller than that on the first surface moderates a stress applied to the unit element at a stage to solder this electronic part onto a circuit board, thereby being capable of preventing the unit element from being cracked. Further, this electronic part is capable of preventing the external electrodes from peeling off the unit element since the external electrodes are configured so as to be thinner toward its ends on the second surface. 
     The manufacturing method of the electronic part described above according to the present invention comprises a step to form a unit element which comprises internal electrodes and has a nearly rectangular parallelopiped form, a step to form external electrodes at predetermined locations ranging from a first surface where said internal electrodes are exposed to second surfaces adjacent to said first surface of said unit element by irradiating with particles of a film forming material by a dry process, and is characterized mainly in that a film forming rate at said predetermined locations on said second surfaces is adjusted using a mask equipped with a film formation adjusting member which shadows portions of said predetermined locations of said second surfaces from the irradiation of the particles of said film forming material. 
     This manufacturing method deposits the film forming particles onto the second surface of the unit element while diffusing across the film formation adjusting members. Accordingly, the external electrodes are formed so as to have film thickness on the second surface, which is gradually increased from their ends. As a result, an electronic part manufactured by the method according to the present invention has a unit element which can hardly be cracked and external electrodes which can hardly peel off. 
     Other objects, configurations and effects of the present invention will be apparent from the following detailed description of the invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a laminated capacitor; 
     FIG. 2 is a perspective view illustrating the laminated capacitor shown in FIG. 1 in its disassembled condition; 
     FIGS. 3 and 4 are sectional views of the laminated capacitor shown in FIG. 1 taken in a direction indicated by A arrows; 
     FIGS. 5 through 10 are diagrams descriptive of 5 manufacturing steps for the laminated capacitor shown in FIG. 1; 
     FIG. 11 is a perspective view illustrating a configuration of a film forming jig in its disassembled condition;. 
     FIG. 12 is a perspective view illustrating another embodiment of a laminated capacitor preferred as another embodiment of the present invention in its disassembled condition; 
     FIG. 13 is a sectional view taken along a direction indicated by arrows A in FIG. 12 for illustrating a connector portion between an internal electrode and an external electrode on an enlarged scale; 
     FIGS. 14 and 15 are sectional views descriptive of manufacturing steps for the laminated capacitor shown in FIG. 13; 
     FIG. 16 is a perspective view illustrating a configuration of a laminated capacitor preferred as still another embodiment of the present invention in its disassembled condition; 
     FIG. 17 is a perspective view illustrating a laminated capacitor preferred as further another embodiment of the present invention; 
     FIG. 18 is a perspective view illustrating a configuration of a laminated capacitor preferred as still further another embodiment of the present invention in its disassembled condition; 
     FIG. 19 is a perspective view illustrating a configuration of a film forming jig in its disassembled condition; 
     FIG. 20 is a sectional view taken in a direction indicated by arrows A in FIG. 19 descriptive of formation of an external electrode; 
     FIG. 21 is a perspective view illustrating a configuration of another film forming jig in its disassembled condition; 
     FIG. 22 is a sectional view taken in a direction indicated by arrows A in FIG. 21 descriptive of formation of an external electrode; 
     FIG. 23 is a perspective view of a laminated capacitor preferred as still another embodiment of the present invention; 
     FIG. 24 is a sectional view taken in a direction indicated by arrow A in FIG. 23; 
     FIG. 25 is a perspective view illustrating a configuration of a film forming jig in its disassembled condition; 
     FIG. 26 is a sectional view taken in a direction indicated by arrows A in FIG. 25 for illustrating an external electrode formation method; 
     FIG. 27 is a sectional view taken in a direction indicated by arrows B in FIG. 25 for illustrating the film formation method; and 
     FIG. 28 is a diagram showing a portion of FIG. 27 on an enlarged scale for illustrating the external electrode formation method. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A first embodiment of the present invention will be described with reference to FIGS. 1 through 4. A laminated capacitor will be described as an example of laminated electronic part in the first embodiment. FIG. 1 is a perspective view of a laminated capacitor preferred as the first embodiment, FIG. 2 is a perspective view illustrating the laminated capacitor shown in FIG. 1 in its disassembled condition, and FIGS. 3 and 4 are sectional views taken in a direction indicated by arrows A for illustrating locations at which external electrodes of the laminated capacitor are formed. 
     In FIG. 1 laminated capacitor  100  is an example of a laminated electronic part having a laminated body  103  including alternately laminated internal electrodes  101  and insulator layers  102 , and a pair of external electrodes  104  which are attached to the laminated body  103 . 
     The internal electrode  101  is a thin metal film which is prepared by sintering a thin film of electrically conductive paste. It is made of a material having a main component, for example, of Ag, Pd or Ag—Pd. Further, the internal electrode  101  includes an internal electrode outlet portion  101   a  and an internal electrode piece  101   b  which is connected to a base of the internal electrode outlet portion  101   a . An exposed end of the internal electrode outlet portion  101   a  is conductively connected to the external electrode  104 . 
     The insulator layer  102  is composed of a rectangular sheet-like ceramic sinter. This ceramic sinter is made of a dielectric material which is prepared by firing a green sheet having a main component, for example, of barium titanate. 
     The external electrode  104  is a thin metal film which is made of Ni, Ag, Sn, Cr, Al, Cu or an alloy thereof. The external electrode  104  is formed by a dry process, typically vacuum deposition or sputtering. The external electrode  104  is formed so it has a predetermined width on a central portion of side surface  103   a  of the laminated body  103  and so it extends onto portions of side surfaces  103   b  and  103   b ′ which intersect side surface  103   a . Similarly the external electrode predetermined width from a side surface  103   a  of the laminated body  103  to side surfaces  103   b  and  103   b ′ which are adjacent to the side surface  103   a . Similarly, the external electrode  104 ′ is formed on a side surface  103   a ′ which is opposed to the side surface  103   a ; electrode  104 ′ also extends onto portions of side surfaces  103   b  and  103   b′.    
     The side surfaces  103   a ,  103   a ′,  103   b  and  103   b ′ of the laminated body  103  have slight concavities and convexities as shown in FIGS. 3 and 4 which are formed by polishing described later. Surface roughness of surfaces  103  is approximately 0.1 μm or lower in terms of an arithmetical mean roughness Ra. Due to a difference between shrinkage coefficients of the internal electrode  101  and the insulator layer  102 , the internal electrode outlet portion  101   a  may protrude from the laminated body  103  at the firing stage, as illustrated in FIG.  3 . However, the internal electrode outlet portion  101   a  is polished as described later so as to have a gentle convex shape as shown in FIG.  3  and has a protruding length D 1  not exceeding approximately 0.5 μm. Similarly, the internal electrode  101  may contract and form a depression in the laminated body  103  as shown in FIG.  4 . In such a case, however, the depression is made gentle by the polishing described later and its depth D 2  does not exceed approximately 0.5 μm. 
     This laminated capacitor  100  has an enhanced electrical conductivity between the external electrode  104  and the internal electrode  101  since an oxide film formed on the internal electrode outlet portion  101   a  at the firing stage of the laminated body is eliminated by the polishing described later. Further, an adhesion property between the laminated body  103  and the external electrode  104  is enhanced owing to an anchor effect produced by the concavities and convexities formed on the surface of the side surfaces  103   a ,  103   a ′,  103   b  and  103   b ′ of the laminated body  103 . Furthermore, a step coverage property is enhanced since the protruding length D 1  of the internal electrode outlet portion  101   a  or the depth of the depression D 2  formed by shrinkage of the internal electrode outlet portion  101   a  is less than a predetermined value. In other words, the external electrode  104  is provided with a film thickness by flattening the portion of the laminated body  103  where the external electrode  104  is to be formed. Accordingly, electrical conductivity is enhanced between the external electrode  104  and the internal electrode  101 . Moreover, the laminated capacitor  100  is capable of preventing the external electrode  104  from being cracked. Accordingly, the laminated capacitor  100  ensures a high adhesion property between the external electrode  104  and the laminated body  103 , and is excellent in its precision, durability, water resistance and reliability. 
     Now, the method of manufacturing laminated capacitor  100  is described below with reference to FIGS. 5 through 10. First, an electrically conductive paste having a main component of Ag, Pd or Ag—Pd is printed onto green sheets and dried. The electrically conductive paste is printed in a pattern of the internal electrode  101 . Then, a plurality of the green sheets are laminated. Further, a laminated body thus obtained is bonded at a temperature of approximately 50° C. while applying a pressure of approximately 40 tons in a direction of its thickness. Thereafter, a laminated chip is obtained by cutting the laminated body into a lattice-like form. 
     Then, the laminated chip is heated to approximately 300° C. in atmosphere. This heating is a de-binder treatment which vaporizes an organic binder contained in the green sheets. Thereafter, a laminated body  103  which has a nearly rectangular parallelepiped form is obtained by firing the laminated chip at a temperature of approximately 1300° C. 
     Then, the laminated body  103  is polished by the sand blast method using part holding tools  110   a  and  110   b . Each of the part holding tools  110   a  and  110   b  is made of an elastic material (for example, rubber) in which holding grooves  111  are formed in parallel with each other. The holding groove  111  has a length which is sufficient for holding at least one laminated body  103 . The holding groove  111  has a width which is slightly narrower than a width of the side surface  103   a  of the laminated body  103 . The holding groove  111  has a depth equal to ½ of a height of the side surface  103   b ′ of the laminated body  103 . 
     The laminated body  103  is polished as described below. First, the laminated body  103  is fitted into the holding groove  111  of the first part holding tool  110   a  as shown in FIG.  5 . Then, areas of the laminated body  103  which are exposed from the first part holding tool  110   a  as shown in FIG. 6, i.e., the side surface  103   a  as a whole as well as upper halves of the side surfaces  103   b  and  103   b ′, are polished by the sand blast method. The sand blast method is a polishing method which blasts Alundum (an abrasive material) with compressed air at 2 kg/cm 2  for several minutes. Then, the second part holding tool  110   b  is overlapped with the first part holding tool  110   a  so that the laminated body  103  which is disposed in the first part holding tool  110   a  is fitted into the holding groove  111  of the second holding tool  110   b  as shown in FIG.  7 . Then, the laminated body  103 , and the part holding tools  110   a  and  110   b  are set upside down as shown in FIG.  8 . Then, the first part holding tool  110   a  is removed so that the laminated body  103  is held by the part holding tool  110   b  only. Finally, surfaces which are exposed from the second part holding tool  110   b  and have not been polished are polished by the sand blast method. 
     Thereafter, a pair of external electrodes  104  are formed on a polished laminated body  103  by the dry process, typically by vacuum deposition or sputtering. The external electrodes  104  are thin metal films made of a metal such as Ni, Ag, Sn, Cr, Al, Cu or an alloy thereof. 
     To form the external electrodes  104  by the vacuum deposition process, the laminated body  103  is mounted on a film forming jig  130  (FIG. 11) and the film forming jig  130  is set in a film forming apparatus such as a vacuum chamber. In this film forming apparatus, the metal forming electrodes  104  is heated to a high temperature and vaporized, particles of the metal are deposited onto the exposed surface of laminated body  103  in film forming jig  130 . Accordingly, the external electrodes  104  composed of thin metal films are formed on the laminated body  103 . 
     The film forming jig  130  is composed of a holding cage  131  and masks  132  through  134  as shown in FIG.  11 . The film forming jig  130  is composed by stacking the members in a direction of its thickness, and is composed of the holding cage  131  which is disposed at a center, and the masks  132 ,  133  and  134  which are laminated outward in this order over and under the holding cage  131 . An aperture is formed in each member of the film forming jig  130  so that the laminated body  103  can be mounted in the film forming jig  130 . An aperture  131   a  having a width and a length which are slightly larger than those of the laminated body  103  is formed in the holding cage  131 . An aperture  132   a  having a width and a length which are slightly smaller than those of the aperture  131   a  of the holding cage  131  is formed in the mask  132  adjacent to the holding cage  131 . An aperture  133   a  corresponding to the aperture  132   a  of the mask  132  is formed in the mask  133  adjacent to the mask  132 . The aperture  133   a  is nearly cross-shaped since it protrudes at centers of its sides for a length of α in a width direction of side surface  103   a . This pair of protruding portions has a width which is the same as a width of the external electrode  104  to be formed on the side surface  103   a  of the laminated body  103 . The mask  134  which is adjacent to the mask  133  and disposed outermost side has an aperture  134   a  which has ends corresponding to the protruding portions of the aperture  133   a  of the mask  133  and is open so as to cover the pair of apertures  133   a . Thicknesses of these members are set so that a thickness of the masks  132 , masks  133  and the holding cage  131  which are overlapped with one another is the same as a height of the side surface  103   b  of the laminated body  103 . This film forming jig  130  exposes only the locations of the sides of the laminated body  103  at which the external electrodes  104  are to be formed, by overlapping the masks  132 , masks  133  and holding cage  131  are with one another, setting the laminated body  103  in the apertures formed in these members, and further overlapping the mask  134 . Though it is general to select a metal such as stainless steel, tungsten or molybdenum as a material for the film forming jig  430 , it is preferable to use a ceramic material having a small expansion coefficient considering a fact that thermal expansion caused by a high temperature at the stage of irradiation with particles of a film forming. 
     The laminated capacitor  100  which is one of laminated electronic parts is manufactured by the method described above. This laminated capacitor  100  has enhanced electrical conductivity between the external electrodes  104  and the internal electrode  101  since an oxide film formed on the internal electrode outlet portion  101   a  at the firing stage of the laminated body is removed by the polishing. Further, the laminated capacitor  100  has an enhanced adhesion property between the laminated body  103  and the external electrodes  104  owing to the anchor effect produced by the concavities and convexities on the side surfaces  103   a ,  103   a ′,  103   b  and  103   b , of the laminated body  103 . 
     Furthermore, the laminated capacitor  100  has an enhanced step coverage owing to the fact that the protruding length D 1  of the internal electrode outlet portion  101   a  or the depth D 2  of the depression formed due to shrinkage of the internal electrode  101  does not exceed the predetermined value. In other words, the external electrodes  104  have a uniform film thickness which is because the locations of the laminated body  103  where the external electrodes.  104  are to be formed are flattened. Accordingly, electrical conductivity is enhanced between the external electrodes  104  and the internal electrodes  101 . Moreover, the laminated capacitor  100  is capable of preventing the external electrodes  104  from being cracked. Accordingly, the laminated capacitor  100  has a high adhesion property between the external electrodes  104  and the laminated body  103 , and is excellent in its precision, durability, water resistance and reliability. 
     Though the part holding jigs  110   a  and  110   b  are used at the polishing stage by the sand blast method in the first embodiment, it is possible to employ at this stage the film forming jig  130  which is used for forming the external electrodes  104 . In such a case, it is preferable to coat a surface of the mask  134  which is the outermost layer of the film forming jig  130  for protecting it from shocks caused by blasting the abrasive material. For coating this surface, it is suitable, for example, to bond a silicone rubber sheet 1 mm thick to the mask  134 . For polishing by the sand blast method, an abrasive material and destructions and polishing time which are similar to those described above are adopted. The sand blast method makes it possible to blast the abrasive material only to the locations at which the external electrodes are formed without blasting the abrasive material to other locations. The manufacturing method therefore makes it possible to prevent destruction and moderate shocks due to the blasting of the abrasive material and variations of characteristics of laminated electronic parts. Further, the method makes it possible to manufacture laminated electronic parts efficiently at a small number of steps since it uses the same mask at the polishing stage by the sand blast method and the stage to form the external electrodes by the dry process. 
     Though the sand blast method is exemplified for polishing the laminated body  103  in the first embodiment, methods which are described below may be adopted instead. That is, the surfaces of the laminated body  103  can be treated, as if they are polished, by submerging the laminated body  103  in dilute hydrochloric acid at several percent for approximately one hour. Further, the laminated body  103  may be subjected to barrel polishing for approximately 10 minutes using zirconia medium having a particle size on the order of 0.5 mm. 
     Then, a second embodiment of the present invention will be described with reference to FIGS. 12 and 13. A laminated capacitor will be described as an example of laminated electronic part. FIG. 12 is a perspective view illustrating a configuration of a laminated capacitor in its disassembled condition and FIG. 13 is a sectional view taken in a direction indicated by arrows A in FIG. 12 for illustrating a connected portions of an internal electrode and an external electrode. 
     In FIG. 12, a reference numeral  200  represents a laminated capacitor selected as one example of laminated electronic part consisting of a laminated body  203  which is composed by alternately laminating internal electrodes  201  and insulator layers  202 , a pair of external electrodes  204  which alternately connect the internal electrodes  201  in parallel at both ends of the laminated body  203 , and intermediate layers  205  which are formed between the laminated body  203  and the external electrodes  204 . 
     The internal electrode  201  is a thin metal film which is formed by sintering a thin film of an electrically conductive paste. Its material has a main component, for example, of Ag, Pd or Ag—Pd. Further, the internal electrode  201  is composed of an internal electrode outlet portion  201   a  and an internal electrode piece  201   b  which has a base connected to the internal electrode outlet portion  201   a . The internal electrode piece  201   b  is rectangular and has longer sides nearly perpendicular to the external electrode  204 . The internal electrode pieces  201   b  are formed so as to have the same width on the internal electrodes  201 . Furthermore, the internal electrode outlet portion  201   a  is formed slightly inside an end surface of the laminated body  203  as shown in FIG. 13 since the internal electrode  201  shrinks at a higher ratio than the insulator layer  202  at a stage to fire the laminated body  203 . 
     The insulator layer  202  is composed of a sheet-like ceramic sinter. This ceramic sinter is made of a dielectric material prepared by firing a green sheet having a main component, for example, of barium titanate. 
     The intermediate layers  205  are disposed at both ends of the laminated body  203 , and formed over end surfaces and side surfaces of the laminated body  203 . Further, the intermediate layers  205  fill up depressions of the laminated body  203  which are formed due to the fact that the internal electrode outlet portions  201   a  are formed inside the end surfaces of the laminated body  203 . Furthermore, the intermediate layers  205  are formed so as to have flat surfaces which are to be joined with the external electrodes  204 . The intermediate layers  205  are made of a metal such as Ag, Sn, Cr, Al, Ni or Cu. 
     The external electrodes  204  are formed at both the ends of the laminated body  203  and cover the intermediate layers  205 . The external electrodes  204  are thin metal films made of Ni, Ag, Sn, Cr, Al, Cu or an alloy thereof. The external electrodes  204  are formed by a dry process which is typically represented by the vacuum deposition and sputtering. The external electrodes  204  are conductively connected to the internal electrodes  201  by way of the intermediate layers  205 . 
     Now, a manufacturing method of the laminated capacitor  200  will be described with reference to FIGS. 14 and 15. FIGS. 14 and 15 are diagrams descriptive of manufacturing steps of the laminated electronic part. 
     First, laminated body  203  is effected by a de-binder treatment and is sintered. Manufacturing steps to this stage are the same as those in the first embodiment and will not be described in particular. 
     Then, each end of the laminated body  203  is immersed into a suspension  206  as shown in FIG.  14  and then is pulled up from the suspension  206  as shown in FIG.  15 . Ultrafine metal powder consisting of Ag, Sn, Cr. Al, Ni, Cu, etc. is dispersed in the suspension  206 . Ultrafine metal particles are metal particles having a particle size not exceeding 0.1 μm. The end surfaces of the laminated body  203  are covered with the suspension  206  at this step and dried for forming the intermediate layers  205 . The intermediate layers  205  may be formed by repeating this step several times. 
     Finally, the external electrodes  204  are formed as a pair of thin metal films by depositing a metal such as Ag, Sn, Cr, Al, Ni, Cu or an alloy thereof onto the laminated body  203  by a dry process such as vacuum deposition or sputtering. The laminated capacitor  200  is manufactured accordingly. The method for forming the external electrodes  204  by the dry process is similar to that described with reference to the first embodiment. 
     The laminated capacitor  200  which is manufactured by this method has the intermediate layers  205  formed between the laminated body  203  and the external electrodes  204  as described above. Accordingly, the intermediate layers  205  moderate stresses between the external electrodes  204  and the laminated body  203 , thereby preventing the laminated body  203  from being cracked or delaminated when the laminated capacitor  200  is soldered to a circuit board. 
     Further, the intermediate layers  205  fill up the depressions on the end surfaces of the laminated body  203  formed due to shrinkage of the internal electrode outlet portions  201   a , and prevent end surfaces of the external electrodes  204  from being cracked even when the external electrodes  204  are formed by the dry process since the joined surfaces between the external electrodes  204  and the intermediate layers  205  are flat. 
     Therefore, the present invention makes it possible to obtain the laminated capacitor  200  which has high adhesion property between the external electrodes  204 , the laminated body  203  and the internal electrodes  201 , and is excellent in water resistance, reliability and durability. 
     Though the intermediate layers  205  are formed by applying the suspension  206  in which ultrafine metal powder are dispersed in the second embodiment, the intermediate layers  205  may be formed by applying an organic metallic resinate and drying it. Further, the intermediate layers  205  may be formed by applying an electrically conductive paste which consists of ultrafine metal particles or an organic metallic resin, a binder and a vehicle and drying the paste. For example, benzyl silicate, zirconium naphthenate or the like is used as the organic metallic resin. 
     Further, it is possible for embodying the present invention to form the intermediate layers  205  by coating a metal having a low fusion point and irradiate coated locations with laser beams so as to fuse and harden the metal having the low fusion point. A metal having a fusion point is a metal having a fusion point not exceeding approximately 400° C. for example, Sn, In, Sn—In alloy, Sn—Ag alloy or In—Ag alloy. 
     Furthermore, the intermediate layers  205  which are thin metal films may be formed by depositing a metal such as Au onto the end surfaces of the laminated body  203  by the dry process such as the vacuum deposition or sputtering. 
     Moreover, the intermediate layers  205  may be used only for filling up the depressions formed on the end surfaces of the laminated body  203 , and not be formed between the laminated body  203  and the external electrodes  204 . In such a case, however, the intermediate layers  205  do not exhibit the effect to prevent the laminated body  203  from being cracked by moderating stresses between the external electrodes  204  and the laminated body  203  though the layers enhance the adhesion property by filling up the depressions. 
     Now, a third embodiment of the present invention will be described with reference to FIG.  16 . In the third embodiment, description will be made of a laminated capacitor, which is an example of laminated electronic part. FIG. 16 is a perspective view illustrating a configuration of the laminated capacitor in its disassembled condition. 
     In FIG. 16, a reference numeral  300  represents a laminated capacitor which is an example of laminated electronic part including a laminated body  303  composed of alternately laminated internal electrodes  301  and insulator layers  302 , and a pair of external electrodes  304  which are attached to the laminated body  303 . 
     The internal electrode  301  is a thin metal film which is formed by sintering a thin film of an electrically conductive paste. Its material has a main component of a metal having a low fusion point which is, for example Ag—Pd or Ag having a fusion point of approximately 1050° C. or less. The internal electrode  301  includes an internal electrode outlet portion  301   a  and an internal electrode piece  301   b  which is connected to a base of the internal electrode outlet portion  301   a . An end of the internal electrode outlet portion  301   a  is connected to the external electrode  304 . 
     The insulator layer  302  is composed of a rectangular sheet-like ceramic sinter. This ceramic sinter is made of a dielectric material which is prepared by sintering a green sheet having a main component, for example, of barium titanate. 
     The external electrode  304  is a thin metal film formed by a dry process which is typically represented by the vacuum deposition and sputtering. A main component of a material selected for the external electrode  304  is a metal which has a fusion point higher than that of the internal electrode  301 . The main component is, for example, Ni which has a fusion point of approximately 1450° C. The external electrode  304  is formed at a predetermined width from a side surface  303   a  of the laminated body  303  to side surfaces  303   b  and  303   b ′ adjacent to the side surface  303   a . Similarly, the external electrode  304  is formed from a side surface  303   a ′ opposite to the side surface  303   a  to the side surfaces  303   b  and  303   b ′. Further, the external electrodes  304  are conductively connected to the internal electrode outlet portions  301   a  of the internal electrodes  301 . 
     A method of manufacturing laminated capacitor  300 , which is an example of a laminated electronic part, is now described. First, an electrically conductive paste containing a main component of Ag—Pd or Ag which has a fusion point not exceeding approximately 1050° C. is printed as patterns of internal electrodes onto green sheets. Then, the green sheets are laminated in a plurality as in the first embodiment, a laminated body thus formed is bonded by applying a pressure of approximately 40 tons in a direction of its thickness at approximately 50° C. and a laminated chip having a nearly rectangular parallelepiped form is obtained by cutting the laminated body in a lattice-like form. 
     Then, the laminated chip is heated to approximately 300° C. in atmosphere for de-binder treatment or vaporizing an organic binder contained in the green sheets and calcined at approximately 90° C., thereby obtaining a laminated body which has a nearly rectangular parallelepiped form. 
     Then, the external electrodes  304  composed of thin metal film are formed by depositing a metal material having a fusion point higher than that of the internal electrodes onto the laminated body by a dry process. The metal material is, for example, a metal such as Ni, which has a fusion point of approximately 1450° C. Materials and structures of masks which are to be used for the dry process are similar to those of the masks used in the first embodiment. 
     This manufacturing method of a laminated electronic part allows metal particles at high temperature to collide and deposit against and onto surfaces of the laminated body at the stage to form the external electrodes by the dry process, thereby decomposing oxide films which are formed on surfaces of the internal electrode outlet portions due to a fusing or reducing function of the internal electrode outlet portions. Accordingly, the laminated electronic part manufactured by this method is free from influences due to the oxide films, and is excellent in an adhesion property and electrical conductivity between the external electrodes and the internal electrodes. 
     Now, a fourth embodiment of the present invention will be described with reference to FIGS. 17 and 18. In the fourth embodiment, description will be made of a laminated capacitor which is an example of laminated electronic part. FIG. 17 is a perspective view of the laminated capacitor and FIG. 18 is a perspective view illustrating a configuration of the laminated capacitor in its disassembled condition. 
     In FIG. 18, a reference numeral  400  represents a laminated capacitor which is an example of laminated electronic part including a laminated body  403  formed by alternately laminating internal electrodes  401  and insulator layers  402 , and a pair of external electrodes  404  which are attached to the laminated body  403 . 
     The internal electrode  401  is a thin metal film which is formed by sintering a thin film of an electrically conductive paste. Its material has a main component, for example, of Ag, Pd or Ag—Pd. Further, the internal electrode  401  consists of an internal electrode outlet portion  401   a  and an internal electrode piece  401   b  which is connected to a base of the internal electrode outlet portion  401   a . An end of the internal electrode outlet portion  401   a  is connected to the external electrode  404 . 
     The insulator layer  402  is composed of a rectangular sheet-like ceramic sinter. This ceramic sinter is made of a dielectric material which is prepared by firing green sheets having a main component, for example, of barium titanate. 
     The external electrode  404  is a thin metal film made of a metal such as Ni, Ag, Sn, Cr, Al, Cu or an alloy thereof. The external electrode  404  is formed by a dry process which is typically represented by the vacuum deposition and sputtering. The pair of external electrodes  404  is formed at a predetermined width from a side surface  403   a  of the laminated body  403  to side surfaces  403   b  and  403   b ′ adjacent to the side surface  403   a . On the side surface  403   a , the external electrode  404  is formed so as to be uniform in thickness in a direction of length thereof but has a center which is thicker than edge portions in a direction of width thereof. The external electrode  404  is disposed so that the thicker portion is conductively connected to the internal electrode outlet portion  461   a.    
     Then, description will be made of a manufacturing method of the laminated capacitor  400  which is selected as an example of laminated electronic part with reference to FIGS. 19 through 22. FIG. 19 is a perspective view illustrating a configuration of a film forming jig in its disassembled condition, FIG. 20 is a sectional view taken in a direction indicated by arrows A in FIG. 19 for description of formation of external electrodes, FIG. 21 is a perspective view illustrating a configuration of another film forming jig in its disassembled condition and FIG. 22 is a sectional view taken in a direction indicated by arrows A in FIG. 20 for description of formation of external electrodes. 
     First, a de-binder treatment is carried out and a fired laminated body  403  is manufactured. Manufacturing steps to this stage are similar to those in the first embodiment and will not be described in particular. 
     Then, a pair of external electrodes  404  is formed on the laminated body  403  by a dry process which is typically represented by the vacuum deposition and sputtering. The external electrode  404  is a thin metal film made of Ni, Ag, Sn, Cr, Al, Cu or an alloy thereof. 
     For forming the external electrodes  404  by the vacuum deposition, for example, the laminated body  403  is mounted on a film forming jig  430  and the film forming jig  430  is set in a film forming apparatus such as a vacuum chamber. In the film forming apparatus, the metal is heated to a high temperature and vaporized, whereby its particles are deposited onto the laminated body  403  which is exposed from the film forming jig  430 . The external electrodes  404  composed of the thin metal films are formed on the laminated body  403  accordingly. 
     The film forming jig  430  is composed of a holding cage  431 , masks  432  through  434  and a holding plate  435 . The film forming jig  430  is formed by stacking these members in a direction of its thickness, or laminating the masks  432 ,  433  and  434  in this order on the holding cage  431 , and the holding plate  435  is disposed under the holding cage  431 . Apertures are formed in the holding cage  431  and the masks  432  through  434  so that the laminated body  403  can be accommodated in the film forming jig  430 . 
     An aperture  431   a  which has a width and a length slightly larger than those of a side surface  403   a  of the laminated body  403  is formed in the holding cage  431 . 
     An aperture  432   a  which has a width and a length slightly smaller than those of the aperture  431   a  of the cage  431  is formed in the mask  432  which is adjacent to the holding cage  431 . 
     An aperture  433   a  which corresponds to the aperture  432   a  of the mask  432  is formed in the mask  433  which is adjacent to the mask  432 . Centers on both sides of the aperture  433   a  protrudes for a length of α in a direction of width of the side surface  403   a , whereby the aperture  433   a  has a nearly cross shape. The pair of protruding portions has a width which is the same as that of external electrodes  404  which are to be formed on the side surface  403   a  of the laminated body  403 . 
     The mask  434  which is adjacent to the mask  433  and disposed on the outermost side of the film forming jig  430  has a pair of apertures  434   a  which have ends corresponding to the protruding portions of the aperture  433   a  of the mask  433  and are open over the aperture  433   a . Further, a pair of film formation retarder members  434   b  is bridged across the apertures  434   a  in a longitudinal direction thereof in the mask  434 . The film formation retarder members  434   b  are nearly bar-shaped and disposed in parallel with longer sides of the apertures  434   a . Further, the film formation retarder members  434   b  are disposed so as to be along steps which are to be formed by film thickness of the external electrode  404 . Furthermore, the film formation retarder members  434   b  are arranged so that a region of the aperture  434   a  which is sandwiched by the pair of film formation retarder members  434   b  has an area larger than that of the rest region of the aperture  434   a . Moreover, the film formation retarder members  434   b  are spaced from the surface of the mask  434  for a predetermined distance outward, i.e., in a direction away from the holding cage  431  and have ends attached to edges of the aperture  434   a . The film formation retarder members  434   b  are spaced as described above so that clearances are formed over the laminated body  403 , whereby metal particles diffuse across the film formation retarder members  434   b  and form the external electrode  404  even under the film formation retarder members  434   b.    
     Thicknesses of these members are set so that a thickness obtained by overlapping the masks  432 ,  433  and the holding cage  431  is equal to a height of the side surface  403   b  of the laminated body  403 . Locations of the side surface of the laminated body  403  at which the external electrodes  404  are to be formed are exposed when the masks  432 ,  433  and the holding cage  431  are overlapped, the laminated body  403  is set in the apertures formed in these members, and the mask  434  is further overlapped. In this condition, the film formation retarder members  434   b  are disposed so as to be along the steps which are to be formed by film thickness of the external electrodes  404  and at a predetermined distance from the laminated body  403 . It is preferable to set thickness of mask  434 , for example, as the predetermined distance between the laminated body  403  and the film formation retarder members  434   b.    
     Though it is general to select a metal such as stainless steel, tungsten or molybdenum as a material for the film forming jig  430 , it is desirable to use a ceramic material which has a small thermal expansion coefficient considering a fact that maintenance of precision is made difficult due to thermal expansion caused by a high temperatures at the stage of irradiation with particles of a film forming material. 
     When the external electrodes  404  are formed by the dry process with the laminated body  403  set on the film forming jig  430  described above, at least the locations of the external electrodes  404  which are to cover the internal electrode outlet portions  401   a  are coated with a larger number of the metal particles and have a larger film thickness than other locations owing to the film formation retarder members  434   b  disposed in the mask  434  as shown in FIG.  20 . Accordingly, the external electrodes  404  can fill up and cover depressions even when the depressions are formed on the side surface of the laminated body  403  due to shrinkage of the internal electrode outlet portions  401   a  into the laminated body  403 . Therefore, the laminated capacitor  400  does not allow its side surf ace to be cracked, and is excellent in its adhesion property and so on. Further, the laminated capacitor  400  is capable of preventing the external electrodes from being cracked or delaminated due to stresses more effectively than a laminated capacitor which has external electrodes having a uniform film thickness. 
     Usable in place of the mask  434  are masks  436  and  437  which are shown in FIGS. 21 and 22. The mask  436  has an aperture  436   a , and is the same as the mask  434  from which the film formation retarder members  434   b  are removed. The mask  437  has a pair of apertures  437   a  and film formation retarder members  437   b  which are disposed in the apertures  437   a , and is the same as the mask  434  in which the film formation retarder members  434   b  are disposed on a plane. The masks  436  and  437  which are overlapped are usable in place of the mask  434 . 
     Now, a fifth embodiment of the present invention will be described with reference to FIGS. 23 and 24. A laminated capacitor will be described as an example of chip-like electronic part in the fifth embodiment. FIG. 23 is a perspective view of the laminated capacitor and FIG. 24 is a sectional view taken in a direction indicated by arrows A in FIG.  23 . 
     In FIG. 23, a reference numeral.  500  represents a laminated capacitor consisting of a unit element  503  which is formed by alternately laminating and then sintering internal electrodes  501  and insulator layers  502 , and a pair of external electrodes  504  which are formed on side surfaces of the unit element  503 . 
     The internal electrode  501  disposed in the unit element  503  is a thin metal film which is formed by firing an electrically conductive paste having a main component such as Pd, Ag or a Pd—Ag alloy. The insulator layer  502  is a ceramic sinter which is formed by firing green sheets. The internal electrode  501  has an end  501   a  which is exposed on a side surface  503   a  of the unit element  503 . The end  501   a  is conductively connected to the external electrode  504 . The unit element  503  is formed by laminating the internal electrodes  501  and the insulator layers  502 . The unit element  503  has a nearly rectangular parallelopiped form whose angles are rounded by barrel polishing or the like. 
     The external electrode  504  is formed on a region ranging from the side surface  503   a  of the unit element  503  to a pair of side surfaces  503   b  adjacent to the side surface  503   a . The external electrode  504  is formed at a predetermined width so as to cover the ends  501   a  of the internal electrodes  501  and conductively connected thereto. The external electrode  504  has film thickness which is varied from location to location as shown in FIG.  24 . 
     Speaking concretely, film thickness T 3  on the side surface  503   a  on which the ends  501   a  are exposed, film thickness T 2  on an edge at which the side surface  503   a  adjoins to the side surface  503   b  and film thickness T 1  on the side surface  503   b  are set in relationship of T 1 &lt;T 2 &lt;T 3 . Further, the film thickness T 1  on the side surface  503   b  is gradually reduced toward ends of the film. The external electrode  504  has a surface whose end intersects with the side surface  503   b  at an angle θ which is not larger than a predetermined angle. 
     Since the external electrode  504  is liable to peel off the unit element  503  when the angle θ is large, it is desirable that the angle θ is no larger than 40 degrees, or more desirably no larger than 20 degrees. 
     The laminated capacitor  500  is capable of maintaining a high joining property and electrical conductivity between the internal electrodes  501  and the external electrodes  504  owing to the fact that the external electrodes  504  have the film thickness which is larger on the side surface  503   a  than that on the side surface  503   b . Owing to the fact that the external electrodes  504  have film thickness which is smaller on the side surface  503   b  than that on the side surface  503   a , on the other hand, the laminated capacitor  500  is capable of reducing stresses applied to the unit element  503 , thereby preventing it from being cracked at a stage to solder the laminated capacitor  500  to a circuit board. Further, the laminated capacitor  500  is capable of preventing the external electrodes  504  from peeling off the unit element  503  owing to the fact that the external electrodes  504  are formed on the side surfaces  503   b  so as to have film thickness which is reduced toward the ends thereof. Accordingly, the laminated capacitor  500  is excellent in electrical conductivity between the external electrodes  504  and the internal electrodes  501 , durability against thermal shocks, precision and reliability. 
     Then, a manufacturing method of the laminated capacitor  500  will be described with reference to FIGS. 25 through 28. FIG. 25 is a perspective view illustrating the film forming jig  530  in its disassembled condition for description of its configuration, FIG. 26 is a sectional view taken in a direction indicated by arrows A in FIG. 25, FIG. 27 is a sectional view taken in a direction indicated by arrows .B in FIG.  25  and FIG. 28 is an enlarged view illustrating a portion of FIG. 27 on an enlarged scale. 
     First, an electrically conductive paste having a main component of Ag, Pd or Ag—Pd is printed onto green sheets and dried. The electrically conductive paste is printed in a pattern of the internal electrodes  501 . Then, a plurality of the green sheets are laminated. Further, a laminated body thus obtained is bonded by applying a pressure of approximately 40 tons in a direction of thickness thereof at a temperature of approximately 50° C. Thereafter, a laminated chip which has a nearly rectangular parallelopiped form is obtained by cutting the laminated body into a lattice form. 
     Then, the laminated chip is heated to approximately 300° C. in atmosphere. This heat treatment is a de-binder treatment for vaporizing an organic binder contained in the green sheets. Thereafter, edges of the laminated chip are rounded by barrel polishing. Then the unit element  503  which is a laminated body having a nearly rectangular parallelopiped form is obtained by firing the laminated chip at approximately 1300° C. 
     Then, a pair of external electrodes  504  is formed by depositing a metal material onto the unit element  503  by a dry process which is typically represented by the vacuum deposition and sputtering. The metal material is Ni, Ag, Sn, Cr, Al, Cu or an alloy thereof. 
     For forming the external electrode  504  by the vacuum deposition, for example, the unit element  503  is mounted on the film forming jig  530  and the film forming jig  530  is set in a film forming apparatus such as a vacuum chamber. In the film forming apparatus, the metal is heated to a high temperature and vaporized, whereby its particles are deposited onto the unit element  503  which is exposed from the film forming jig  530 . The external electrodes  504  which are composed of thin metal films are formed on the unit element  503  accordingly. 
     The film forming jig  530  used for forming the external electrodes  504  will be described with reference to FIGS. 25 through 28. The film forming jig  530  is composed of a holding cage  531  and masks  532  through  534 . The film forming jig  530  is composed by stacking the members in a direction of thickness, and laminating the masks  532 ,  533  and  534  over and under the holding cage  531 . An aperture is formed in each member so that the unit element  503  can be mounted in the film forming jig  530 . 
     An aperture  531   a  which has a width and a length slightly larger than those of the side surface  503   a  of the unit  503  element  503  is formed in the holding cage  531 . 
     An aperture  532   a  which has a width and a length slightly smaller than those of the aperture  531   a  of the holding cage  531  is formed in the mask  532  adjacent to the holding cage  531 . 
     An aperture  533   a  which corresponds to the aperture  532   a  of the mask  532  is formed in the mask  533  adjacent to the mask  532 . The aperture  533   a  protrudes, at centers of both sides thereof, for a length α in a width direction-of the side surface  503   a  and has a nearly cross shape. This pair of protruding portions has a width equal to that of the external electrodes  504  which are to be formed on the side surfaces  503   a  of the unit element  503 . 
     The mask  534  which is adjacent to the mask  533  and disposed on an outermost side of the film forming jig  530  has an aperture  534   a  which has ends corresponding to the protruding portions of the aperture  533   a  of the mask  533  and is open over the pair of protruding portions of the aperture  533   a.    
     Thicknesses of these members are set so that a thickness obtained by overlapping the masks  532 ,  533  and the cage  531  is equal to a height of the side surface  503   b  of the unit element  503 . Further, a thickness β 2  of the mask  533  is set so as to be nearly equal to a height of the external electrode  504  to be formed on the side surface  503   b  of the unit element  503 . 
     This film forming jig  530  exposes only locations of the side surface of the unit element  503  at which the external electrodes  504  are to be formed when the masks  532 ,  533  and the holding tool  531  are overlapped, the unit element  503  is set in the apertures formed therein and the mask  534  is further overlapped. 
     Though it is general to use a metal such as stainless steel, tungsten or molybdenum as a material for the film forming jig  530 , it is desirable to adopt a ceramic material having a small expansion coefficient considering the fact that maintenance of precision is made difficult due to thermal expansion caused by a high temperature at a stage of irradiation with particles of a film forming material. 
     For forming the external electrodes  504  on the unit element  503  with the film forming jig  530 , the unit element  503  is first set in the aperture of the film forming jig  530 . Then, the film forming jig  530  is set in a film forming apparatus such as a vacuum chamber. The film forming jig  530  is set so that an emission source of particles of a film forming material M which is a metal material is located in a longitudinal direction of the aperture  534   a  of the mask  534  and obliquely sideward the unit element  503 . Then, particles of the film forming material M are emitted from the emission source and deposited on the side surface of the unit element  503  which is exposed from the film forming jig  530 . Finally, the film forming jig  530  is taken out of the film forming apparatus and the unit element  503  is taken as the laminated capacitor  500  out of the film forming jig  530 . 
     For irradiating the film forming jig  530  with the particles of the film forming material M, an angle of incidence φ on the side surface  503   a  of the unit element  503 , thickness β 1  of the mask  534 , thickness β 2  of the mask  533  and the length α of the protruding portions of these masks are set as described below. When a straight line having an angle of incidence φ is traced from an end of the mask  534  to the side surface  503   b  of the unit element  503 , an intersection between this straight line and the side surface  503   b  is located at a point which is nearer the side surface  503   a  for a distance d than an end of the external electrode  504  to be formed. Accordingly, a region of the side surface  503   b  which is located toward a center thereof from this intersection is optically shadowed from the emission source of the particles of the film forming material M. At the deposition stage, however, the particles of the film forming material M diffuse across the edge of the mask  534  and deposit onto this shadowed region in an amount smaller than that of particles which deposit directly, whereby the external electrode  504  is formed on the side surface  503   b  so as to have film thickness gradually reduced from a region which is not shadowed to the shadowed region and thinnest at an end of the shadowed region. It is adequate to set the angle of incidence φ at 30 to 60 degrees from a view point of a gap g to be reserved between the side surface  503   b  of the unit element  503  and the mask  532 . 
     This manufacturing method of the chip-like electronic part adjusts the height d to be shadowed on the side surface  503   b  of the unit element  503  by adequately adjusting the angle of incidence φ, the protruding lengths α of the apertures  533   a  and  534   a  of the masks  533  and  534 , the thickness β 2  of the mask  533 , and the thickness β 1  of the mask  534 . Accordingly, this method adjusts a deposition speed of the particles of the film forming material on the side surface  503   b  of the unit element  503 . Therefore, this method makes it possible to form the external electrode  504  on the side surface  503   b  so as to have film thickness which is larger than that on the side surface  503   a  and reduced toward the end of the side surface  503   b.    
     Though the laminated capacitors have been described above as examples of electronic parts, it is needless to say that the present invention is applicable not only to laminated capacitors but also widely to other electronic parts. The present invention is applicable, for example, to laminated inductors, laminated LC filters and array-type composite parts.