WO2009101948A1 - エッチング方法 - Google Patents
エッチング方法 Download PDFInfo
- Publication number
- WO2009101948A1 WO2009101948A1 PCT/JP2009/052258 JP2009052258W WO2009101948A1 WO 2009101948 A1 WO2009101948 A1 WO 2009101948A1 JP 2009052258 W JP2009052258 W JP 2009052258W WO 2009101948 A1 WO2009101948 A1 WO 2009101948A1
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- WIPO (PCT)
- Prior art keywords
- etching
- etched
- metal
- water
- copper
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/18—Acidic compositions for etching copper or alloys thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/08—Apparatus, e.g. for photomechanical printing surfaces
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
- H05K3/067—Etchants
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0736—Methods for applying liquids, e.g. spraying
- H05K2203/075—Global treatment of printed circuits by fluid spraying, e.g. cleaning a conductive pattern using nozzles
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/14—Related to the order of processing steps
- H05K2203/1476—Same or similar kind of process performed in phases, e.g. coarse patterning followed by fine patterning
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/15—Position of the PCB during processing
- H05K2203/1563—Reversing the PCB
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/15—Position of the PCB during processing
- H05K2203/1572—Processing both sides of a PCB by the same process; Providing a similar arrangement of components on both sides; Making interlayer connections from two sides
Definitions
- the present invention relates to an etching method for forming irregularities on the surface of a metal material.
- An etching technique is used as a technique for forming a depression on the surface of a metal material.
- the processing speed is faster than other production methods such as additive and semi-additive methods.
- a subtractive method using etching technology is widely used.
- a metal layer containing a metal to be etched is laminated on an insulating substrate, and a resist pattern is provided on the metal layer. Etching is performed to form a conductor pattern.
- the cross-sectional shape of this conductor pattern is often a so-called trapezoidal shape with the top width narrower than the bottom width (for example, edited by the Japan Institute of Electronics Packaging, Printed Circuit Technology Handbook 3rd edition, published by Nikkan Kogyo Shimbun, Ltd. 2) 0 0 6 May 30th, see ⁇ 7 8 0-7 8 1).
- the cross-sectional shape of the conductor pattern becomes trapezoidal, there are problems that the area for mounting components on the surface is insufficient, or that the wiring resistance increases and the transmission loss increases.
- a metal layer containing a metal to be etched is provided on both sides of an insulating base material, and a resist pattern is provided on the metal layer. Etching has been performed simultaneously from the top and bottom of the material.
- the surface on the side etched as the upper surface has a problem that the conductor pattern cannot be made finer than the surface etched as the lower surface (for example, Koji Sato, Kitagawa Shuji, “High-precision etching conditions for continuous circuit formation”, Matsushita Electric Works Technical Report, Matsushita Electric Works, Ltd., August 2010, No. 7 5, p. 4 4 ⁇ 5 0) .
- etching is performed with one surface (surface) of the material to be etched as the bottom surface, the surface opposite to the A surface (B surface), which is the upper surface, is kept out of contact with the etching solution, and etching is performed after the etching of the A surface is completed.
- B surface A surface
- etching is performed after the etching of the A surface is completed.
- a protective layer is provided on the B surface to be etched later, and after etching the A surface from below, the protective layer is peeled off from the B surface, and the protective layer is applied to the A surface. It is possible to flip the plate upside down and pinch the B side from below, but it is necessary to perform the process of applying and peeling the protective layer twice, which makes the process very complicated. is there. Summary of the Invention
- a first object of the present invention is to provide an etching method capable of obtaining a conductor pattern having a cross-sectional shape close to a rectangle and smooth side surfaces.
- a second object of the present invention is to provide an etching method capable of forming fine conductor patterns on both surfaces of an etching target material without using a complicated apparatus or process. Means for solving the problem
- a first etching method of the present invention is an etching method for a material to be etched in which a resist pattern is provided on a metal layer containing a metal to be etched, and (1) reacts with the metal to be etched. Etching using a spray nozzle to etch so that the etching depth is 60% or more of the metal layer thickness. (2 ) It is characterized by sequentially performing an etching process by spraying an etching solution that does not react with the metal to be etched to form a water-insoluble reactant using a spray nozzle.
- the etching rate when the metal to be etched is immersed by etching using the etching solution used in the step (2) is 0.3 ⁇ m / min or more 3 ⁇ / ⁇ in The following is preferable.
- the metal to be etched is preferably copper or a copper alloy
- the etching solution used in the step (1) is preferably an etching solution containing iron (III) chloride and oxalic acid.
- the metal to be etched is copper or a copper alloy
- the etching solution used in the step (2) is an etching solution containing iron chloride (III) or copper chloride (II).
- the step (3) it is preferable to perform the step of removing the water-insoluble reactant using a solution that dissolves the water-insoluble reactant.
- the metal to be etched is copper or a copper alloy
- the etching solution used in the step (2) is an etching solution containing copper (II) chloride.
- an etching target material in which a metal layer containing a metal to be etched is laminated on both surfaces of an insulating base material and a resist pattern is provided on the metal layer.
- the etching material is held horizontally or at an angle of 20 ° or less from the horizontal, and an etching solution that reacts with the etching metal to form a water-insoluble reactant is added to the etching material.
- an etching solution containing a compound in which the etching metal is copper or a copper alloy and reacts with ions of the etching metal to form a water-insoluble reactant is obtained.
- An etching solution containing (III) and oxalic acid is preferred.
- the first etching method of the present invention a conductor pattern having a cross-sectional shape close to a rectangle and smooth side surfaces can be obtained.
- the second etching method of the present invention can form fine patterns on both surfaces of the material to be etched without using a complicated apparatus or process.
- FIG. 1 is a schematic sectional view of a conductor pattern formed by an etching method.
- FIG. 2 is a schematic cross-sectional view of a concavity (constriction) that may occur on the side of the conductor pattern.
- FIG. 3 is a schematic cross-sectional view showing a preferred positional relationship between the flat workpiece and the spray nozzle.
- FIG. 4 is a schematic cross-sectional view showing a preferred positional relationship between the flat workpiece and the spray nozzle.
- first etching method The first etching method of the present invention (hereinafter referred to as “first etching method”) will be described.
- FIG. 1 is a schematic cross-sectional view of a conductor pattern formed by an etching method.
- base material ⁇ c A conductor pattern made of the metal layer 1b is formed, and 1a is a resist pattern used during etching.
- the portion of the space (dent) where the metal layer 1 b is etched by the etching method is called “etching portion” lg.
- (1) a plating solution that reacts with the metal to be coated to form a water-insoluble reactant is sprayed using a spray nozzle, and the etching depth is reduced to a metal layer. Etching so as to be 60% or more of the thickness.
- a step of etching by spraying an etching solution that does not react with the metal to be etched to form a water-insoluble reactant using a spray nozzle By sequentially performing, the top space width 1 f and bottom space width 1 e of the etching portion are close to each other, and a conductor pattern having a cross-sectional shape close to a rectangle can be obtained.
- a method of spraying an etching solution onto an etching material using a spray nozzle is called a spray method.
- step (1) in the etching part 1 g, etching proceeds while an insoluble reactant is deposited on the part where the flow rate of the etching solution is slow.
- the progress of etching is remarkably slow, and at the beginning of the step (1), the water-insoluble reactant tends to adhere to the part that hinders the etching in the lateral direction. Therefore, etching mainly proceeds only in the depth direction.
- the lateral etching also proceeds at a certain rate. In particular, in the vicinity of the central portion of the metal layer thickness of the etched portion 1 g, as shown in FIG.
- the cross-sectional shape after the completion of the step (2) can be controlled by adjusting the etching depth in the step (1).
- Etching of step (1) is performed until the etching depth is 60% or more and less than 90% of the metal layer thickness, and further, etching of step (2) is performed until a desired bottom space width is obtained.
- the top space width 1 f and the bottom space width 1 e are close to each other, and it becomes easier to obtain a trapezoidal conductor pattern that is closer to a rectangle than the conventional etching method.
- the cross-section of the conductor pattern is such a shape, it is slightly inferior from the viewpoint of achieving both high insulation reliability and low conductor resistance compared to the case where the cross-section of the conductor pattern is rectangular. Similar to the conductor pattern manufactured by the method, there is an advantage that the quality control of the conductor pattern can be performed by observing from above.
- Etching of step (1) is performed until the etching depth reaches 90% or more and 100% or less of the metal layer thickness, and further, etching of step (2) is performed until a desired bottom space width is obtained. Then, the cross-sectional shape of the conductor pattern can be made closer to a rectangle.
- the etching in step (1) is performed over a period of time that is 1 to 1.1 times the time required for the etching depth to be equal to the metal layer thickness, and a desired bottom space width is obtained. Even if the etching in step (2) is performed, the cross-sectional shape of the conductor pattern can be made closer to a rectangle.
- Process (1) is etched over 1.1 times longer than the time required for the etching depth to be equal to the metal layer thickness, and until the desired top space width of 1 ⁇ is obtained.
- an inverted trapezoidal conductor pattern having a narrow top space width 1 f and a wide bottom space width 1 e can be obtained.
- the etching rate of the etching solution used in the step (2) is high, it is compared with the case where etching is performed in one step using only the same etching solution as that used in the step (1).
- the time of the step (1) and the step (2) is added, there is an advantage that the etching can be completed in a shorter time.
- the material to be etched refers to a material in which a resist pattern is provided on a metal layer containing a metal to be etched.
- a metal layer is laminated on one or both sides of an insulating base material, and a register is formed on the metal layer. A pattern provided with a strike pattern is used.
- Substrates that can be used when manufacturing printed wiring boards include epoxy resins, phenol resins, melamine resins, polyester resins, polyimide resins, polyamide resins, fluororesins, and other synthetic resins. It is possible to use fiber reinforced resin such as paper phenol, paper epoxy, glass epoxy, etc. impregnated into fibers such as paper and glass fiber, and various types of glass, ceramics and metals. In the production of printed wiring boards, fiber reinforced resins, polyimides, fluorine resins, and other heat resistant resins and ceramics are preferably used from the viewpoints of insulation, mechanical properties, and heat resistance. Furthermore, it is possible to use a base material in which two or more kinds of materials are combined and laminated.
- the metal to be etched refers to a metal material that is removed by etching.
- Various metals such as copper, copper alloy, aluminum, and tin can be used for the metal to be etched.
- copper or a copper alloy is preferably used from the viewpoint of conductivity, mechanical characteristics, solderability, and the like.
- the photolithography method is preferably used because a fine pattern can be easily formed.
- the resist used in the photolithography method is a negative photoresist that is used by dissolving and removing other than the part insolubilized by light irradiation with an alkaline aqueous solution, etc. Both positive-type photoresists can be used, but using positive-type photoresists makes it difficult for the skirts of the line to spread and highly reliable printed wiring. It is particularly preferable because a plate can be produced.
- the resist used for the A surface and the resist used for the B surface may be the same type or different types.
- the etching solution is a solution that melts the metal to be etched at a speed that is significant in processing, that is, at a speed of 0.1 ⁇ in or more under the processing conditions to which the etching solution is applied. Further, the etching solution contains a component that dissolves the metal to be etched (hereinafter referred to as “etching component”). Examples of the etching component when the metal to be etched is copper or a copper alloy include iron chloride (IV), copper (II) chloride, sulfuric acid-hydrogen peroxide mixture, persulfate, and the like.
- step (1) an etching solution that reacts with the metal to be etched to form a water-insoluble reactant is used.
- the etching solution in the step (1) contains a compound that can react with ions of the metal to be etched to form a water-insoluble reactant.
- this “compound that forms a water-insoluble reactant by reacting with ions of the metal to be etched” is added mainly for the purpose of improving the cross-sectional shape of the conductor pattern to be close to a rectangle. This is referred to as “shape improver” below.
- a water-insoluble reactant generated by the reaction between the metal ions to be etched and the shape modifier is referred to as a “water-insoluble reactant”.
- the content of the shape improver may be an amount sufficient to form a water-insoluble reactant on the surface of the metal to be etched (including the side surface of the etched portion).
- an etchant that does not react with the metal to be etched to form a water-insoluble reactant is used as the etchant in the step (2).
- the etching component of the etching solution in the step (1) and the etching component of the etching solution in the step (2) may be the same or different. It should be noted that the etching solution used in step (2) may contain a small amount of shape improver as long as the water-insoluble reactant does not remain on the surface of the metal to be etched (including the side surface of the etched portion). . Therefore, in order to prevent the etching solution in step (1) from entering the etching solution in step (2), operations such as draining and rinsing are performed between step (1) and step (2). It is preferable but not essential to prevent the shape improver from being mixed in the etching solution.
- the metal to be etched is copper or a copper alloy
- the etching liquid in the step (1) contains 1 to 20% by mass of iron (III) chloride as an etching component, In addition, as a shape improver, 5 to 50 mass with respect to iron (III) chloride. It preferably contains 0 / oxalic acid.
- the metal to be etched is copper or a copper alloy, and an aqueous solution containing iron (III) chloride or copper (II) chloride as an etching component is used as the etching liquid in step (2). It is particularly preferable to use an aqueous solution containing copper (II) chloride. Since these etching components have a lower concentration required to obtain a certain etching rate than other etching components, the viscosity when compared at the same etching rate is low. As a result, even in a fine etched portion, etching proceeds uniformly, and a good cross-sectional shape closer to a rectangle can be obtained.
- the side surface of the conductor pattern can be made very smooth.
- the etching rate (hereinafter referred to as “immersion etching rate”) when the metal to be etched is immersed and etched using the etching solution in step (2) is 0.3 m / min or more and 3 ⁇ / min or less. It is preferable to use an etching solution. This is because, when such an etchant is used, the top portion and the bottom portion of the conductor pattern are etched at a uniform rate, and an etching shape closer to a rectangle can be obtained.
- the etching rate by immersion etching is higher than 3 ⁇ / min, the difference in the etching rate between the top part and the bottom part becomes large, so that the top space width 1 f tends to be wide and the bottom space width 1 e tends to be narrow. is there. Also, if the etching rate by immersion etching is slower than 0.3 / im / min, the effect of improving the roughness of the conductor pattern side surface 1d may be reduced.
- the etching rate is less than As the etching solution having an upper value of 3 ⁇ / ⁇ ⁇ ⁇ or less, an etching solution in which the concentration of the etching component is appropriately adjusted is used.
- an etching solution in which the concentration of the etching component is appropriately adjusted is used.
- the metal to be etched is copper or a copper alloy
- an etching solution containing copper (II) chloride and 1 to 5% by mass of hydrogen chloride is used.
- constriction may remain in the etched portion after step (2).
- This problem is due to the removal of the constriction in the step (2) because the water-insoluble reactant in the constricted portion is preferentially removed in the initial stage of the etching in the step (2), and the etching proceeds unevenly. It occurs when the action is reduced.
- a treatment for removing the water-insoluble reactant may be performed prior to the step (2). Specifically, between step (1) and step (2), (3) a step of removing the water-insoluble compound is performed using a solution that dissolves the water-insoluble reactant.
- an aqueous solution containing a drug that dissolves a water-insoluble reactant can be used as the liquid used in the step (3).
- the solution for dissolving the water-insoluble reactant used in the step (3) dissolves the metal to be etched.
- the solution dissolves only at a slow rate of less than 0.3 m / mi ⁇ , and it is most preferable that the metal to be etched does not dissolve at all.
- Drugs that dissolve water-insoluble reactants are selected as appropriate according to the type of water-insoluble reactants.
- Monovalent acids such as hydrochloric acid, amide sulfuric acid, and acetic acid;
- Chelating agents such as droxylic acid and ethylenediamine tetraacetate are used.
- Such a drug is preferably one that dissolves the water-insoluble reactant as quickly as possible.
- an aqueous solution containing hydrochloric acid is particularly preferably used as the liquid in the step (3).
- various methods such as a spray method, a dipping method, and a paddle method can be used.
- the spray method is preferred because of the advantages such as rapid movement of the liquid in the micro concave region on the surface of the coating material, rapid dissolution of the water-insoluble reactants, and miniaturization of the apparatus.
- the metal to be etched is copper or a copper alloy
- an etching solution containing copper chloride ( ⁇ ) as an etching component is used in step (2), so that the side surface of the etched portion becomes very smooth.
- the etching solution containing copper chloride (II) as an etching component has low solubility of water-insoluble reactants, and it takes a very long time for the step (2) and the constriction on the side of the conductor pattern remains. There are many cases. Therefore, if the metal to be etched is copper or a copper alloy and an etchant containing copper (II) chloride as an etching component is used in step (2), the gap between steps (1) and (2) In addition, it is particularly effective to perform step (3).
- the second etching method (hereinafter referred to as “second etching method”) of the present invention will be described.
- the material to be etched is a material in which a metal layer containing a metal to be etched is laminated on both surfaces of an insulating base material, and a resist pattern is provided on the metal layer.
- Base materials include epoxy resin, phenol resin, melamine resin, polyester resin, polyimide resin, polyamide resin, fluororesin and other synthetic resins, and these synthetic resins are impregnated into fibers such as paper and glass fibers.
- Paper-reinforced resin such as paper phenol, paper epoxy, and glass epoxy, and various types of glass, ceramics, and metals can be used.
- fiber reinforced resins, polyimides, fluororesins and other heat resistant resins and ceramics are preferably used from the viewpoints of insulation, mechanical properties, heat resistance, and the like. Furthermore, it is possible to use a base material in which two or more kinds of materials are combined and laminated.
- the metal to be etched refers to a metal material that is removed by etching.
- Various metals such as copper, copper alloy, aluminum, and tin can be used for the metal to be etched.
- copper or a copper alloy is preferably used from the viewpoint of conductivity, mechanical characteristics, solderability, and the like.
- the resist used in the photolithographic method is a negative photoresist that is used by dissolving and removing other than the portion insolubilized by light irradiation with an alkaline aqueous solution or the like, and the portion solubilized by light irradiation is dissolved and removed by an alkaline aqueous solution or the like.
- Both positive photoresists can be used, but it is particularly preferable to use a positive photoresist because the bottom of the line portion is less likely to spread and a highly reliable printed wiring board can be manufactured.
- the resist used for the A surface and the resist used for the B surface may be the same type or different types.
- the A surface is etched in the step (4), then the material to be etched is turned upside down in the step (5), and then the B surface is etched in the step (6).
- the resist pattern on the B side may be formed at any time prior to the step (6), which is the etching process on the B side. Since it may change in quality and the adhesion of the material used for the resist may deteriorate, it is preferably formed before the etching of the A side.
- the resist pattern on the A surface may be removed after the etching of the B surface is completed, or may be removed before the B surface is etched.
- the resist used on the A side and the B side can be removed by the same method, it is more efficient to remove the resist on both sides together after the etching of the B side. Is preferable.
- the B surface is etched, if a resist pattern remains on the A surface, it is preferable from the viewpoint that a minute shape change does not occur on the A surface.
- an etching solution that reacts with the metal to be etched to form a water-insoluble reactant is used in the same manner as the etching solution used in step (1) of the first etching method.
- Such an etchant can be etched when it is flowing at a relatively fast rate. Although it dissolves the genus, it has the property of hardly dissolving the metal to be etched when it is stationary or flowing at a slow speed.
- the metal to be etched is copper or a copper alloy
- 1 to 20 mass as a main active ingredient. /. Les, Shi preferable to use an etchant containing oxalic acid 5-1 0 0 mass 0/0 for iron (III) chloride Iron chloride (III), and as the shape modifiers.
- an etchant containing oxalic acid 5-1 0 0 mass 0/0 for iron (III) chloride Iron chloride (III) iron
- the dissolution rate of the metal to be etched in a fluid state and the dissolution rate of the metal to be etched in a stationary state are greatly different, so that the shape of the upper surface during the etching of the lower surface can be extremely reduced. Because.
- the etching material in order to reliably produce a fine conductor pattern, it is most preferable that the etching material is held horizontally, but the effect of the present invention can be obtained if the etching material is almost horizontal. Can do.
- the angle formed by the surface to be etched and the horizontal plane of the material to be etched may be 20 ° or less, more preferably 10 ° or less, and even more preferably 5 ° or less.
- FIG. 3 and 4 are schematic cross-sectional views showing the positional relationship between the material to be etched and the spray nozzle.
- the material to be etched is transported from right to left.
- the material to be etched is transported from the front to the back.
- the angle X formed by the downward vertical line P with respect to the material to be etched 3a in the direction parallel to the transport direction and the central axis C of the spray nozzle is preferably 45 ° or less. It is particularly preferably 0 ° or less.
- the angle y formed by the vertical line P ′ downward with respect to the etching material 3a in the direction perpendicular to the conveying direction and the central axis C ′ of the spray nozzle Is preferably 30 ° or less, more preferably 10 ° or less, and further preferably 5 ° or less. If the central axis of the spray nozzle is not within these ranges, the etching progress may be non-uniform or the pattern formed after etching may not faithfully reproduce the shape of the resist pattern.
- the liquid supply pressure (gauge pressure) to the spray nozzle is preferably set to 50 to 500 kPa. If the supply pressure is lower than this, the difference between the rate at which the etching solution that has wrapped around the upper surface during the etching of the lower surface dissolves the metal to be etched and the dissolution rate at the lower surface becomes smaller. This is because the shape may change on the upper surface during etching.
- a water-insoluble reactant may be formed on part or all of the B surface by the etchant that has spilled onto the B surface during the etching of the A surface in step (4).
- etching of the B surface may take a long time, or the etching finish may be different between the region where the water-insoluble reactant is formed and the region where it is not formed.
- a process of removing water-insoluble reactants as a step (7) between the etching of the A surface in the step (4) and the etching of the B surface in the step (6). Just do.
- a washing treatment with an aqueous solution containing a drug that dissolves a water-insoluble reactant may be performed between the steps (4) and (6).
- a drug that dissolves the water-insoluble reactant the same drug as that used when performing the treatment for removing the water-insoluble reactant in step (3) of the first etching method should be used.
- Can do For example, monovalent acids such as hydrochloric acid, amide sulfuric acid, and acetic acid, hydroxy acids such as citrate and darconate, and chelating agents such as tyrylenediaminetetraacetate are used.
- a water-insoluble reactant is attached to the etched material after etching, it is preferable to perform a treatment for removing the water-insoluble reactant from both sides after etching the B surface.
- a washing treatment with an aqueous solution containing a drug that dissolves a water-insoluble reactant may be performed as in the step (7).
- the second etching method is a method that can be suitably used for manufacturing a double-sided printed wiring board, but may be used as part of a manufacturing process for a printed wiring board having three or more conductor layers. it can.
- Examples 1 to 11 are examples according to the first etching method.
- the above-mentioned process (1) was performed using a spray etching device (manufactured by YAMAGATA MA CH I NERY CO., LTD., Product name: YCE- 85 III) and a spray pressure of 20 O k Pa.
- the etching solution was sprayed until the etching depth reached 16 ⁇ m (89% of the electrolytic copper foil thickness).
- the etched material after etching was immediately washed with water. The etching time at this time was 70 seconds.
- the etching time at this time was 70 seconds.
- Etching was performed on the material to be etched after step (1) using the etching solution for step (2) until the bottom space width 1 e of the etched portion was 25 ⁇ which is the same as the space width of the resist pattern. (Etching time 75 seconds).
- the etched material after etching was immediately washed with water.
- the conditions such as the etching apparatus and spray pressure were the same as those in step (1).
- the material to be etched after step (2) is immersed in an aqueous solution of sodium hydroxide having a concentration of 3.0% by weight for 3 minutes to remove the resist pattern, and then the hydrogen chloride concentration is 3.6%.
- a printed wiring board for evaluation was produced by spraying / 0 hydrochloric acid with a spray nozzle for 30 seconds for washing, washing with water and drying.
- a printed wiring board for evaluation was produced in the same manner as in Example 1 except that the composition of the etching solution for step (2) was changed as shown in Table 1.
- the material to be etched after the step (2) in these examples was observed with an optical microscope, it was not observed that water-insoluble reactants adhered to the side surface of the etched portion.
- step (1) cleaning the material to be etched with hydrochloric acid with a hydrogen chloride concentration of 3.6% by mass for 30 seconds
- a printed wiring board for evaluation was produced in the same manner as in Example 1 except that (3) was performed and the composition of the etching solution for step (2) was changed as shown in Table 1.
- the material to be etched after the step (2) in these examples was observed with an optical microscope, it was not observed that a water-insoluble reactant was adhered to the side surface of the etched portion.
- a printed wiring board for evaluation was produced in the same manner as in Example 8, except that the etching depth in step (1) was 1 ⁇ m (61% of the electrolytic copper foil thickness). [Example 1 1]
- a printed wiring board for evaluation was produced in the same manner as in Example 8, except that a sodium persulfate aqueous solution having a concentration of 10% by mass was used as the etching solution for step (2).
- a sodium persulfate aqueous solution having a concentration of 10% by mass was used as the etching solution for step (2).
- a printed wiring board for evaluation was produced in the same manner as in Example 8 except that the step (3) was not performed.
- a printed wiring board for evaluation was produced in the same manner as in Example 8 except that the etching solution for step (1) was changed as shown in Table 1.
- the material to be etched after the step (1) of this example was observed with an optical microscope, it was observed that light green crystals (water-insoluble reactants) were attached to the side surface of the etched portion. It was done.
- a printed wiring board for evaluation was produced in the same manner as in Example 1 except that the step (1) was performed until the bottom space width became 25 m and the step (2) was not performed.
- Step (1) A printed wiring board for evaluation was produced in the same manner as in Example 8, except that the etching was performed until the etching depth reached 9 zm (50% of the electrolytic copper foil thickness).
- Example 8 As the etchant for the process (2), the same composition as the etchant for the process (1) was used. A printed wiring board for evaluation was produced in the same manner as in Example 8 except for the above.
- the printed wiring board for evaluation obtained in each example and comparative example was embedded and cut with an epoxy resin, the cross section was polished, the cross section was observed with an optical microscope, and the top space width 1 f of the etched portion was measured. . Furthermore, the presence or absence of the neck 2a and the depth d of the neck 2a were measured and classified into the following three stages.
- the depth d is the length up to the deepest part 2c with reference to the upper end 2b of the constriction (Fig. 2). Table 2 shows the evaluation results.
- each printed wiring board for evaluation was observed with a scanning electron microscope, the state of the conductor pattern side surface 1d was observed, and classified into the following five stages.
- Table 2 shows the evaluation results.
- Example 8 As can be seen from the comparison between Example 8 and Example 1 3, in Example 8 where the etching solution used in the step (1) is an etching solution containing iron chloride (III) and oxalic acid, it is more rectangular. It can be seen that a cross-sectional shape is obtained.
- Example 1 As can be seen from 2, when the metal to be etched is copper or a copper alloy and the etching component used in the step (2) is copper chloride ( ⁇ ⁇ ), the constriction 2 a remains on the side surface of the conductor pattern. However, as can be seen from Example 8, even in such a case, the necking can be suppressed to a high degree by performing the step (3).
- Examples 14 to 17 described below are examples according to the second etching method. [Example 14]
- exposure “development” and water washing were performed to form a resist pattern for evaluation having a line width no space width of 15 15, and a material to be etched for an etching test was produced.
- This material to be etched was held horizontally with the A surface facing downward, and the etching solution prepared at 30 ° C. was sprayed toward the material to be etched to etch the A surface.
- the tip of the spray nozzle is located 6 cm below the material to be etched (z: Fig. 3), and its injection axis is on the vertical line.
- ISJJ X020 PP manufactured by Ikeuchi Co., Ltd.
- Etching is performed 90 seconds after the above etching is started with the supply pressure of the etching solution to the spray nozzle being 200 kPa, spray amount 2.0 L / min (spray amount per unit area 77 mL / cm 2 ⁇ mi ⁇ ) Liquid injection was stopped.
- the to-be-etched material after water washing was observed with the optical microscope, it was observed that the light green crystal
- the top and bottom of the material to be etched was inverted.
- step (7) hydrochloric acid having a hydrogen chloride concentration of 3.6% by mass was sprayed and washed on each side for 30 seconds, and then dried in a water tank to produce a printed wiring board for evaluation.
- Iron chloride (III) 4.1 mass. /. Etching solution containing 2.0% by mass of oxalic acid was prepared in the same manner as in Example 14. Using this etching solution, etching was performed for 2 Amin on both the A and B sides in the same manner as in Example 14. The portions of the rolled copper foil where there was no resist pattern on each side were removed at 12 minutes after spraying of the etching solution started.
- the printed wiring board for evaluation had a line / space width in the range of 15 ⁇ 2 ⁇ over the entire surface of both sides, and no disconnection of the line was observed. When the material to be etched after washing with water was observed with an optical microscope, light green crystals (water-insoluble reactants) were observed to adhere to the side surfaces of the etched part.
- a printed wiring board for evaluation was produced in the same manner as in Example 14 except that in step (4) and step (6), the entire etching apparatus was inclined by 10 ° from the horizontal plane. At this time, the relative positional relationship between the material to be etched, the nozzle, and its injection axis is the same as in Example 14. The linenospace width of the etched portion at the highest position on each surface is 15 / im ⁇ 2.
- a printed wiring board for evaluation was produced in the same manner as in Example 16 except that the entire etching apparatus was inclined 20 ° from the horizontal plane. Lines etched at the highest position on each side / Space width is 15 ⁇ ⁇ 2 m / 1 5 / m ⁇ 2 m, and the rhinospace width of the etched part at the lowest position is 18 ⁇ m soil 2 ⁇ m / 1 2 ⁇ m ⁇ 2 ⁇ m.
- a printed wiring board for evaluation was produced in the same manner as in Example 14 except that the etching solution did not contain oxalic acid, and that the spray time of the etching solution was 45 seconds on each side.
- the printed wiring board for evaluation excessive etching of the A surface progresses while the B surface is etched in step (6), and the line Z space width varies depending on the location, but 9 ⁇ 3 ⁇ It was in the range of m / 2 1 ⁇ 3 ⁇ .
- a printed wiring board for evaluation was produced in the same manner as in Comparative Example 5, except that the material to be etched was washed with water between step (4) and step (6).
- the printed wiring board for evaluation had a line Z space width of approximately 15 ⁇ m / 15 ⁇ m on both sides, but both sides were excessively etched locally, resulting in a line width of l O jm (target It was observed that the value was less than 2/3) of the value, or that the wire was broken at the extreme part.
- the composition of the etching solution is iron chloride (III) 4.1 mass. /.
- the evaluation printed wiring board was prepared in the same manner as in Example 14 except that 0.1% by mass of oxalic acid and the jetting time of the etching liquid were set to 80 seconds for each of the steps (4) and (6). Produced. The copper foil where no pattern exists on each surface was removed 60 seconds after the start of the jetting of the etching solution. In this evaluation printed circuit board, excessive etching of surface A progresses while etching surface B, and the line space width varies depending on the location, but 1 2 ⁇ 3 m 1 8 ⁇ 3 ⁇ m Was in range.
- the surface B has a line width of 15 ⁇ ⁇ 3 ⁇ / 1 5 ⁇ ⁇ 3 ⁇ in the majority of the surface, but the etching solution adhered during etching of the surface, resulting in excess. Etchan It was observed that a part of the line width was less than 6 / m (target value of 2-5). Further, when the material to be etched after washing with water was observed with an optical microscope, it was not observed that a water-insoluble substance adhered to the side surface of the etching part.
- a printed wiring board for evaluation was produced in the same manner as in Example 16 except that the inclination angle of the etching apparatus was set to 30 °.
- the line Z space width of the portion etched at the highest position on each surface is 15 ⁇ ⁇ 3 ⁇ / 1 5 / m ⁇ 3 m, while the etched portion at the lowest position is the space portion. Copper remained.
- a printed wiring board for evaluation was produced in the same manner as in Comparative Example 8 except that the etching time of the etching solution was set to 300 seconds.
- the line / space width of the etched portion at the lowest V on each side was 15 / xm 3 ⁇ / 1 5 jum ⁇ 3 ⁇ ⁇ , but at the highest etched portion Etching progressed excessively, and the line ⁇ space width was 9 ⁇ ⁇ 3 ⁇ / 2 1 ⁇ m ⁇ 3 ⁇ m.
- a printed wiring board having fine conductor patterns on both sides can be produced by a simple method.
- Comparative Examples 5 to 7 when an etchant that forms a water-insoluble compound that is essential for the second etching method is not used, locally unintended etching is caused by an etchant that wraps around the upper surface. Thus, it was impossible to produce a printed wiring board with a fine wiring pitch by a simple process such as that used in the present invention.
- Comparative Examples 8 to 9 when the material to be etched is not held at an angle of 20 ° or less from the horizontal, the etching finish varies in-plane, and it is easy to use as in the present invention. It was impossible to produce a printed wiring board with a fine wiring pitch in a simple process. Industrial applicability
- the etching method of the present invention is highly controlled not only for the production of printed wiring boards, but also for various other industrial applications such as the production of lead frames, precision gears, precision leaf springs, encoder disks and stripes, and various stencils.
- etching of copper or copper alloy can be suitably used.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- ing And Chemical Polishing (AREA)
- Manufacturing Of Printed Circuit Boards (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/867,109 US20110056910A1 (en) | 2008-02-12 | 2009-02-04 | Etching method |
EP09709861A EP2253739A1 (en) | 2008-02-12 | 2009-02-04 | Etching method |
CN200980104941.7A CN101952484B (zh) | 2008-02-12 | 2009-02-04 | 蚀刻方法 |
JP2009553427A JP5349340B2 (ja) | 2008-02-12 | 2009-02-04 | エッチング方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008030367 | 2008-02-12 | ||
JP2008-030367 | 2008-02-12 |
Publications (1)
Publication Number | Publication Date |
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WO2009101948A1 true WO2009101948A1 (ja) | 2009-08-20 |
Family
ID=40956978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/052258 WO2009101948A1 (ja) | 2008-02-12 | 2009-02-04 | エッチング方法 |
Country Status (7)
Country | Link |
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US (1) | US20110056910A1 (ja) |
EP (1) | EP2253739A1 (ja) |
JP (2) | JP5349340B2 (ja) |
KR (1) | KR20100122476A (ja) |
CN (1) | CN101952484B (ja) |
TW (2) | TWI522494B (ja) |
WO (1) | WO2009101948A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011144423A (ja) * | 2010-01-15 | 2011-07-28 | Mitsubishi Paper Mills Ltd | 銅または銅合金用エッチング液 |
WO2013136729A1 (ja) * | 2012-03-16 | 2013-09-19 | 住友ベークライト株式会社 | 積層板及びプリント配線板の製造方法 |
JP2017152527A (ja) * | 2016-02-24 | 2017-08-31 | 三菱マテリアル株式会社 | パワーモジュール用基板の製造方法 |
JP2017152507A (ja) * | 2016-02-24 | 2017-08-31 | 三菱マテリアル株式会社 | パワーモジュール用基板の製造方法 |
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JP5529494B2 (ja) * | 2009-10-26 | 2014-06-25 | 株式会社三井ハイテック | リードフレーム |
CN106793534A (zh) * | 2015-11-20 | 2017-05-31 | 富泰华工业(深圳)有限公司 | 电路板钢网印刷方法 |
CN105578774A (zh) * | 2015-12-25 | 2016-05-11 | 惠州中京电子科技有限公司 | 一种pcb板阴阳铜厚的制作方法 |
JP2017222908A (ja) * | 2016-06-16 | 2017-12-21 | セイコーエプソン株式会社 | 金属部品の製造方法及び電子機器の製造方法 |
EP3518630A1 (en) * | 2018-01-29 | 2019-07-31 | AT & S Austria Technologie & Systemtechnik Aktiengesellschaft | Anisotropic etching using different etching compositions |
CN109275268A (zh) * | 2018-11-14 | 2019-01-25 | 江门崇达电路技术有限公司 | 一种用于介质层厚小于0.15mm的PCB背钻制作方法 |
CN112687590A (zh) * | 2021-01-08 | 2021-04-20 | 开化晶芯电子有限公司 | 一种半导体硅片加工用蚀刻装置 |
CN114928946B (zh) * | 2022-05-27 | 2024-03-22 | 深圳恒宝士线路板有限公司 | 一种热电分离填平电镀的双面金属基板制备蚀刻辅助设备 |
CN115799077B (zh) * | 2023-02-08 | 2023-04-18 | 四川富乐华半导体科技有限公司 | 一种覆铜陶瓷基板台阶蚀刻方法 |
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- 2009-02-04 EP EP09709861A patent/EP2253739A1/en not_active Withdrawn
- 2009-02-04 JP JP2009553427A patent/JP5349340B2/ja not_active Expired - Fee Related
- 2009-02-04 CN CN200980104941.7A patent/CN101952484B/zh not_active Expired - Fee Related
- 2009-02-10 TW TW103114663A patent/TWI522494B/zh not_active IP Right Cessation
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JP2011144423A (ja) * | 2010-01-15 | 2011-07-28 | Mitsubishi Paper Mills Ltd | 銅または銅合金用エッチング液 |
WO2013136729A1 (ja) * | 2012-03-16 | 2013-09-19 | 住友ベークライト株式会社 | 積層板及びプリント配線板の製造方法 |
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JP2017152507A (ja) * | 2016-02-24 | 2017-08-31 | 三菱マテリアル株式会社 | パワーモジュール用基板の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
TW201430171A (zh) | 2014-08-01 |
TW200949014A (en) | 2009-12-01 |
CN101952484B (zh) | 2014-05-07 |
US20110056910A1 (en) | 2011-03-10 |
TWI447267B (zh) | 2014-08-01 |
JP5349340B2 (ja) | 2013-11-20 |
KR20100122476A (ko) | 2010-11-22 |
JP2013237932A (ja) | 2013-11-28 |
EP2253739A1 (en) | 2010-11-24 |
JP5634570B2 (ja) | 2014-12-03 |
CN101952484A (zh) | 2011-01-19 |
TWI522494B (zh) | 2016-02-21 |
JPWO2009101948A1 (ja) | 2011-06-09 |
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