摘要:
A method for producing an inner shell used for a disc cartridge in which an optical disc, an inner shell and shutter members are housed in a main cartridge body unit. The inner shell provided in the main cartridge body unit includes a first molded portion, provided with an aperture, a second molded portion having a resin injection port and molded at a position where the aperture is formed, and a flanged thin-walled section connecting the first and second molded portions to each other. The method includes the steps of injecting molten resin into a cavity defined by a fixed metal die and a movable metal die for molding the first molded portion, the second molded portion, and the flanged thin-walled section, and severing the flanged thin-walled section by a punch provided to the movable metal die before the molten resin injected into the cavity is cooled and solidified.
摘要:
In a video tape recorder for recording a video signal having a first field frequency and a video signal a second field frequency, substantial centers 11a of lengths of recording tracks, on a magnetic tape 7, for the video signals having the first and second field frequencies are recorded thereon at the same position.
摘要:
Disclosed is a disk cartridge capable of preventing the permeation of dust in the disk cartridge. A labyrinth shape portion having a recessed dust deposition portion formed in a gap at a portion between tilt planes for overlap of shutters are vertically overlapped to each other.
摘要:
The present invention relates to a disk cartridge in which a disk-like recording medium such as an optical disk, a magneto-optical disk and a magnetic disk is accommodated within a disk compartment of a cartridge housing, a disk recording medium device in which the disk-like recording medium is accommodated in advance within the disk compartment so as to become freely rotatable and a disk recording and/or reproducing apparatus for recording and/or reproducing information by using this disk recording medium device.A disk cartridge according to the present invention comprises a cartridge housing in which a disk compartment is formed by combining an upper shell and a lower shell and in which an opening portion is formed on the lower shell and the like and a pair of shutter members provided on the cartridge housing so as to become movable between the opening position at which the opening portion is opened and the closing position at which the opening portion is closed and which has joint portions that are joined to each other at the closing position, wherein a rectangular groove portion and a rib portion that can be engaged with each other are provided on each joint portion of a pair of shutter members over approximately the total length of the joint portion.According to the present invention, a dust-proof property of the joint portions, which are joined to each other, of a pair of shutter members can be enhanced. Thus, it is possible to provide the disk cartridge, the disk recording medium device and the disk recording and/or reproducing apparatus in which dusts, smudges and so on are difficult to enter the disk compartment.