Please select the most similar patent number from A, B, C and D. Which number is?
The embodiments of the present application disclose a housing manufacturing method, a housing and an electronic device. The housing manufacturing method comprises: providing a housing, and performing polishing treatment on the outer surface of the housing; performing oxidation treatment on the outer surface of the housing after the polishing treatment; and performing at least three times on the outer surface of the housing paint spraying treatment after the oxidation treatment, and forming at least three paint layers on the outer surface of the housing.
A: A surface hardening process of an aluminium alloy mould for a bottle blowing machine comprises the following steps: polishing a surface of a cavity of an aluminium alloy mould, and putting the polished aluminium alloy mould into an oxidation tank with electrolyte, to perform hard anodizing; coating weak conducting film on a parting line at an edge of the cavity of the oxidized aluminium alloy mould; and polishing the surface of the cavity of the oxidized aluminium alloy mould again. The surface of the cavity of the aluminium alloy mould is oxidized to have a hardened layer, so that the surface of the cavity is more wear-proof and more corrosion-resistant, and the hardened layer is tightly jointed with the surface of the cavity, and therefore it is not easy for the hardened layer to fall off.
B: Disclosed are an electronic device shell and a manufacturing method therefor and an electronic device. The electronic device shell comprises: a shell body, wherein the shell body is provided with a graphics/text region and a high transmission region, the high transmission region being located at the periphery of the graphics/text region; and a graphics/text layer, wherein the graphics/text layer is arranged on a first surface of the shell body, and the orthographic projection of the graphics/text layer on the shell body overlaps the orthographic projection of the graphics/text region on the shell body. The transmittance of the high transmission region is greater than or equal to 50%.
C: A metal surface treatment method, comprising the following steps: performing dry polishing treatment on the surface of a metal product by means of a biological abrasive; purifying the surface of the polished metal product; coating the surface of the purified metal product with an aluminum film; coloring the aluminum film; and sealing the colored aluminum film. The metal product is polished by means of dry polishing, and thus, a pretreatment process is effectively reduced, and the discharge of waste water is reduced; purification is performed by means of a diluted acid solution, and thus, the consumption of acid-base chemical products is effectively reduced and the present invention is environmentally friendly; the appearance of the metal product can be effectively beautified by means of coloring; by means of sealing, the abrasion resistance and corrosion resistance of the metal product are improved; and the cost of the metal surface treatment can be effectively reduced.
D: A method and an apparatus (100) for performing optical treatment on the surfaces of a housing. The method comprises: a laser engraving machine emits a first light beam (130) and a second light beam (140); transmits the first light beam (130) through a first light transmission region of a photomask (110) to a first adhesive surface (150) of the housing, so as to perform laser engraving on the first adhesive surface (150); transmits the second light beam (140) through a second light transmission region of the photomask (110) to a light reflective module (120); and the light reflective module (120) reflects the second light beam (140) to a second adhesive surface (160) of the housing, so as to perform laser engraving on the second adhesive surface (160), wherein an included angle is formed between the first adhesive surface (150) and the second adhesive surface (160). This method and apparatus (100) for performing optical treatment on the surfaces of a housing allow laser engraving to be performed on a bottom surface and side surfaces of the shell of a terminal device simultaneously.
Answer: B