Open-and-close device made of aluminium alloy plate for recording medium shell

Abstract

The present invention provides a shutter using a recording medium case of an aluminum alloy plate satisfying all the characteristics required for the shutter. The switch is composed of: an aluminum alloy substrate containing Mg: 2.2 to 2.8% by mass, Mn: 0.35 to 0.55% by mass, and Fe: 0.1 to 0.4% by mass; A chromate film provided as a first layer on the surface of the outer side of the shutter of the above-mentioned recording medium case, the above-mentioned chromate film is provided so that the amount of chromium deposited is 5 to 50 mg/m2 in conversion; A film made of acrylate-modified polyester urethane resin is provided as the second layer on the outer surface of the device, and the film thickness of the film made of acrylate-modified polyester urethane resin is 0.5 to 3 μm. Inorganic microparticles having an average particle diameter of 10 μm or less are contained in an amount of 5 to 20 parts by weight relative to 100 parts by weight of the above-mentioned acrylate-modified polyester-urethane resin, so as to be 100 parts by weight of the above-mentioned acrylate-modified polyester-urethane resin. The oxidized polyethylene-based lubricant is contained in a proportion of 0.5 to 3 parts by weight.

Description

Technical field [0001] The present invention relates to a shutter provided on a housing that accommodates recording media such as floppy disks and other magnetic disks, MO disks, and compact disks and other optical disks. In particular, it relates to a shutter using an aluminum alloy plate that fully satisfies the characteristics of lightness, rigidity, defect resistance, punching processability, bending processability, solvent solubility and UV curable ink printing properties. Background technique [0002] In floppy disks (floppy disks) and other optical disks, MO disks, small disks and other optical disks, as shown in the example of the floppy disk in Fig. 1, a magnetic disk or optical disk (disk for recording) on ​​which information is recorded is contained in a housing 2 made of synthetic resin. Wait for the recording medium 3. In addition, when writing or reading information, a magnetic head or an optical head is brought close to the recording medium 3 in the casing 2 to rea...

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Problems solved by technology

[0007] However, even though these prior arts of the present applicant have properties such as light weight and rigidity required as an aluminum alloy plate for a switch, it cannot be said that they fully satis

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