Fuji Photo Film Company, Limited

Fjui Photo Film Co., Ltd.

Kazutoshi Machida

Naoyoshi Chino

Tsutomu Sugisaki

Tadashi Irie

A cartridge including a cartridge case having a disc-shaped recording medium received therein so as to allow predetermined information signals to be recorded and reproduced, and a shutter and method for producing the shutter which is molded of a synthetic resin to slidably open and close an opening portion formed on the cartridge case so as to allow at least a part of the disc-shaped recording medium to be exposed to the outside. The shutter includes an upper main plate, a lower main plate and a coupling plate which connects the upper main plate to the lower main plate via the coupling plate in an integrally molded state while having a U-shaped cross-sectional contour to hold the cartridge case in a clamped state. A gate used for performing a molding operation is formed on the outer surface of the side plate, with the position of the gate being determined such that it always remains within an effective opening region corresponding to the opening portion.

Method for producing shutter for disc cartridge

A cartridge including a cartridge case having a disc-shaped recording medium received therein so as to allow predetermined information signals to be recorded and reproduced, and a shutter molded of a synthetic resin to slidably open and close an opening portion formed on the cartridge case so as to allow at least a part of the disc-shaped recording medium to be exposed to the outside. In accordance with the present invention, the shutter is composed of an upper main plate, a lower main plate and a coupling plate which connects the upper main plate to the lower main plate via the coupling plate in an integrally molded state while having an U-shaped cross-sectional contour to hold the cartridge case in a clamped state. A gate used for performing a molding operation is formed on the outer surface of the side plate, with the position of the gate being determined such that it always remains within an effective opening region corresponding to the opening portion. The invention also provides a method for producing the shutter.

Synthetic resin disc cartridge shutter having non-engaging raised gate

Double injection molding is used to form a tape reel of two different resins. One of the resins, which is harder-wearing and more expensive than the other, is used to form a projecting portion which, being subjected to constant pressure by a spring, is required to have good wear-resistance. The other resin is a cheaper, general-purpose type, and is used to form the other parts of the reel. By making it possible to use double injection molding to form the different parts of the reel simultaneously, the reel has few parts and assembly entails few operations, and will enable the material costs of the reel to be reduced.

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Kanagawa, Japan

Kazutoshi Machida