Method for forming black oxide film on the shield can using copper foil tape

Abstract

The present invention relates to a method for forming a black oxide film on a shield can using copper foil tape, and more specifically, to a method for forming a black oxide film on a shield can using an improved copper foil tape that ensures cost reduction and ease of manufacturing by manufacturing a shield can using durable and inexpensive SUS (Steel Use Stainless) as a substrate instead of using copper or copper alloy, which has poor durability and is expensive, and forming a black oxide film to prevent light reflection on the shield can, which can be formed easily and quickly without plating or masking.

Description

Technology Field

[0001] The present invention relates to a method for forming a black oxide film on a shield can using copper foil tape, and more specifically, to a method for forming a black oxide film on a shield can using an improved copper foil tape that ensures cost reduction and ease of manufacturing by manufacturing a shield can using durable and inexpensive SUS (Steel Use Stainless) as a substrate instead of using copper or copper alloy, which has poor durability and is expensive, and forming a black oxide film to prevent light reflection on the shield can, which can be formed easily and quickly without plating or masking. Background Technology

[0003] When using various electronic or communication devices such as portable wireless terminals and digital cameras, the electronic components equipped in the electronic or communication devices generate electromagnetic waves, and the electromagnetic waves generated by the said electronic components are strictly regulated.

[0004] While these electromagnetic waves are used beneficially in applications such as wireless communication and radar, they adversely affect the operation of electronic devices and act as harmful elements to the human body.

[0005] Therefore, various electronic and communication devices must mandatorily undergo Electromagnetic Compatibility (EMC) testing to verify whether electromagnetic waves are suitable for the user environment.

[0006] Here, the Electromagnetic Compatibility (EMC) testing conducted is divided into Electromagnetic Interference (EMI) caused by radioactive noise and Electromagnetic Susceptibility (EMS) testing to block electromagnetic waves harmful to the human body, and is strictly regulated.

[0007] Accordingly, electronic components mounted on a printed circuit board inside an electronic device are covered with a designated shield can to block harmful or interfering electromagnetic waves generated from the electronic components, thereby preventing them from affecting the operation of the device itself as well as other electronic devices.

[0008] In other words, the shield can typically takes the shape of a box with an open bottom to cover electronic components. Such a shield can is installed on a printed circuit board via shield can fixing clips that are attached to the printed circuit board to clamp the side walls of the shield can.

[0009] In addition, the shielding of electronic components is achieved by forming multiple coupling holes on a printed circuit board and installing a clip having a clamping portion formed in the coupling holes, and then inserting a box-shaped shield can with one side open into the clamping portion of the clip to shield the electronic components located inside the shield can.

[0010] Furthermore, shield cans are used to provide additional rigidity to components, in addition to their electromagnetic shielding effect. Particularly recently, as the function of capturing and storing photos or videos has been emphasized in mobile terminals such as mobile phones and PDAs, camera modules are generally installed. Shield cans for camera modules are installed to create a form suitable for mounting and to protect them from external impacts.

[0011] A shield can for a camera module has a lens window opening for a camera lens formed by perforating it in the camera body housing, and a black coating layer or a black printing layer for reducing reflectivity is formed around the lens window opening.

[0012] However, conventionally, there was a problem in that the AR (anti-reflective coating) process had to be performed multiple times to protect the paint layer, which increased working time and consequently raised product production costs.

[0013] To improve this, a technology is being used to perform anti-reflective coating work using a black oxide film.

[0014] However, this black oxide film has the disadvantage that it can only be applied to the surface of copper, which requires the shield can to be manufactured from expensive copper, while also being difficult to process and susceptible to corrosion.

[0015] Above all, since the process is carried out using copper or copper alloy materials as the base, there is also a disadvantage in that the durability is weak.

[0016] Therefore, there is a need for a new method for forming an oxide film on shield cans to solve these problems. Prior art literature

[0018] Korean Registered Patent No. 10-2180262 (Nov. 12, 2020) Shield can for camera module and method of manufacturing the same Korean Registered Patent No. 10-2349047 (Jan. 5, 2022) Method of forming an oxide film The problem to be solved

[0019] Accordingly, the objective of the present invention is to provide a method for forming a black oxide film on a shield can using an improved copper foil tape, which is created to solve the various problems of the prior art as described above, by manufacturing a shield can using SUS (Steel Use Stainless), which is durable and inexpensive, instead of using copper or copper alloy, which is durable and expensive, and forming a black oxide film to prevent light reflection on the shield can, which can be formed easily and quickly without plating or masking, thereby ensuring cost reduction and ease of manufacturing. means of solving the problem

[0021] An example of a method for forming a black oxide film on a shield can using a copper foil tape according to the present invention to achieve the above-mentioned purpose is:

[0022] As a means to achieve the above-mentioned purpose, the method comprises: a first step of preparing a main body case made of stainless steel (SUS); a second step of attaching double-sided tape to the inner surface around the opening of the main body case and to the inner surface of the main body case excluding the opening; a third step of attaching copper foil tape to the double-sided tape, such that at the perimeter of the opening, it protrudes further toward the center of the opening to form an unattached portion; and a fourth step of forming a black oxide film layer on the surface of the copper foil tape.

[0023] At this time, the copper foil tape used in the third step is also characterized by the use of rolled foil or plated foil.

[0024] In addition, forming a black oxide film layer in the above fourth step is also characterized by magnetizing the surface by immersing it in an electrolyte for black oxide film and treating it at 80-90°C for 120-240 seconds.

[0025] In addition, the electrolyte for the black oxide film is also characterized by being composed of a mixture of 2.5g copper carbonate, 1.5g arsenic oxide, 2.5g antimony trioxide, 1.5g potassium sulfide, and 2.5g sodium nitrate based on 100ml of sodium hydroxide aqueous solution. Effects of the invention

[0027] According to the present invention, instead of using copper or copper alloys which have poor durability and are expensive, a shield can is manufactured using SUS, which has strong durability and is inexpensive, and a black oxide film for preventing light reflection is formed on the shield can, which can be formed easily and quickly without plating or masking, thereby achieving an improved effect of reducing costs and ensuring ease of manufacturing. Brief explanation of the drawing

[0029] FIGS. 1 to 3 are exemplary sample photographs of a shield can to illustrate a method according to the present invention. FIG. 4 is an exemplary process diagram illustrating a method for forming a shield can black oxide film using copper foil tape according to the present invention. Specific details for implementing the invention

[0030] Hereinafter, preferred embodiments according to the present invention will be described in more detail with reference to the attached drawings.

[0031] Prior to describing the present invention, the following specific structural or functional descriptions are provided merely for the purpose of illustrating embodiments according to the concept of the present invention. Embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described herein.

[0032] In addition, since embodiments according to the concept of the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0033] The method for forming a black oxide film on a shield can using a copper foil tape according to the present invention is applied to a shield can to form a black oxide film layer, thereby performing the function of preventing light reflection when using a camera.

[0034] In this context, as previously explained, a shield can refers to a component that covers electronic components mounted on a printed circuit board inside an electronic device to block harmful or interfering electromagnetic waves generated from those components, thereby preventing them from affecting the operation of the device itself as well as other electronic devices.

[0035] As shown in the examples of FIGS. 1 to 4, these shield cans include a main body case (100) which is a substrate processed from SUS (Steel Use Stainless) unlike conventional ones.

[0036] Here, since the main body case (100) is manufactured from stainless steel (SUS), it has the advantage of being durable, especially corrosion resistant, and inexpensive compared to using conventional copper or copper alloys.

[0037] In other words, while conventional copper or copper alloy materials require additional plating or coating to prevent corrosion, the present invention has the advantage of not requiring such treatment because it uses SUS.

[0038] Additionally, the main body case (100) may have various shapes, but it is most common to have a 'C' shape, and an opening (110) constituting a lens window is formed in a part of the main body case (100).

[0039] In addition, a black oxide film layer (200) is formed around the opening (110) and on the inner surface to provide a function of preventing light reflection when using the camera.

[0040] At this time, the present invention has a major feature in that it can form a black oxide film layer (200) simply, easily, quickly, and accurately using double-sided tape and copper foil tape, unlike the conventional method of using plating or masking when forming the black oxide film layer (200).

[0041] However, nickel plating can be performed only when soldering is required. Of course, in addition to nickel, tin, gold, and silver are also possible.

[0042] According to a preferred embodiment of the present invention, a method for forming a black oxide film on a shield can using copper foil tape comprises: a first step of preparing a main body case (100) made of stainless steel (SUS); a second step of attaching a double-sided tape (130) to the inner surface around the opening (110) of the main body case (100) and to the inner surface of the main body case (100) excluding the opening (110); a third step of attaching a copper foil tape (140) to the double-sided tape (130), but attaching it so that it protrudes further toward the center of the opening (110) around the opening (110) to have an unattached portion (120); and a fourth step of forming a black oxide film layer (200) on the surface of the copper foil tape (140).

[0043] At this time, in the second step, the double-sided tape (130) is attached precisely only to the inner surface of the opening (110) in the case of the opening (110).

[0044] That is, it must be attached accurately so that there is no part protruding into the opening (110). This is important for forming the non-adhesive part (120).

[0045] In addition, the copper foil tape (140) used in the third step above may be a rolled foil or a plated foil.

[0046] Particularly preferably, a plating foil with a thickness of 35±1㎛ can be used.

[0047] In addition, the reason for forming the non-adhesive portion (120) in the third step above is to completely block light reflection from inside and outside the opening (110).

[0048] That is, since a black oxide film layer (200) is formed along the perimeter of the non-adhesive portion (120) at the entrance of the opening (110), the reflection and diffuse reflection of light flowing in and out through the opening (110) are perfectly suppressed, thereby preventing shooting defects or light scattering caused by light disturbance in advance and providing a characteristic that induces the acquisition of high-quality images and videos.

[0049] And, forming the black oxide film layer (200) in the above fourth step means immersing the surface in an electrolyte for black oxide film and treating it at 80-90°C for 120-240 seconds to magnetize the surface, thereby blocking light reflection as well as providing corrosion resistance.

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[0059] By manufacturing in this way, the present invention manufactures a shield can using durable and inexpensive SUS (Steel Use Stainless) as the base material, instead of using copper or copper alloys which have poor durability and are expensive, and forms a black oxide film to prevent light reflection on the shield can easily and quickly without plating or masking, thereby achieving an improved effect of securing cost reduction and ease of manufacturing.

[0060] In addition, based on 100 ml of sodium hydroxide aqueous solution, 1.5 g of 1,2-dibromo-2,4-dicyanobutane, 1.5 g of thiocyanate, 2.5 g of zirconium oxide, and 1.5 g of dichan may be further added to the electrolyte for the black oxide film.

[0061] At this time, 1,2-dibromo-2,4-dicyanobutane is a substance corresponding to CAS No. 35691-65-7, which improves the coating and adhesion of the object to be rusted.

[0062] In addition, thiocyanate is added to inhibit foreign matter adhesion.

[0063] In addition, zirconium oxide is added to form a protective film to enhance fire resistance and corrosion resistance.

[0064] In addition, Dichan is (C6H 10 It is 2·NH3HNO2, and its formal name is Dicyclo Hexyl Ammonium Nitrite. It forms a thin protective layer on metals such as iron, and through this protective layer, it blocks oxygen, moisture, or oxidizing substances from reacting with the metal surface, thereby preventing rust. Explanation of the symbols

[0066] 100: Main body case 110: Opening 120: Non-adhesive part 130: Double-sided tape 140: Copper foil tape 200: Black oxide film

Claims

Claim 1 A first step of preparing a main body case (100) made of stainless steel (SUS); a second step of attaching double-sided tape (130) to the inner surface around the opening (110) of the main body case (100) and to the inner surface of the main body case (100) excluding the opening (110); a third step of attaching copper foil tape (140) to the double-sided tape (130), but attaching it so that it protrudes further toward the center of the opening (110) around the opening (110) to have a non-adhesive portion (120); A method for forming a black oxide film on a shield can using a copper foil tape, comprising a fourth step of forming a black oxide film layer (200) on the surface of the copper foil tape (140), wherein forming the black oxide film layer (200) in the fourth step involves magnetizing the surface by immersing it in an electrolyte for black oxide film and treating it at 80-90°C for 120-240 seconds. Claim 2 A method for forming a black oxide film on a shield can using a copper foil tape, wherein, in claim 1, the copper foil tape (140) used in the third step is characterized by using rolled foil or plated foil. Claim 3 delete Claim 4 delete

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