Daicel Chemical Industries, Ltd.

Seiichi Ohta

Seitaro Hamano

Yasushi Hiramatsu

Chihiro Aoki

Kunihito Kamakura

Tokuji Tanaka

Etsuji Akimoto

A structure for preventing the dislocation of a spring is provided in an optical disk cartridge wherein a shutter (23) is opened and closed in accordance with a sliding movement of a sliding jig (24) provided in the inner portion of the shutter and joined to the spring contacting portions of cartridge case via a spring (27). The spring contacting portions of the cases consist of the surfaces of a contacting wall (32), and upper (33) and lower (34) walls extending from the contacting wall, the lower wall being provided with a spring dislocation preventing projection (36).

Structure for preventing dislocation of a spring in an optical disk

An optical information recording medium comprising a glass base, a primer coating layer formed on the glass base and a recording layer formed on the primer coating layer is disclosed. The optical information recording medium is characterized in that the primer coating layer comprises a linear acrylic resin having as a repeating unit an atomic group represented by the following formula (1): ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group and R.sup.2 is an alkyl group having 1 to 4 carbon atoms. A coupling agent may be interposed between the primer coating layer and the recording layer.

Optical information recording medium containing linear acrylic resin

A book case type optical disk storage container adapted to house a cartridge type optical disk with its shutter opened, the container being characterized in that one storage surface of the container is provided with a shutter stopper for keeping the shutter open, and a projection for supporting an optical disk base rotatably, the other storage surface being provided with a disk rotating jig and a disk base cleaning device. A structure for preventing the dislocation of a spring is provided in the optical disk cartridge wherein a shutter is opened and closed in accordance with a sliding movement of a sliding jig provided in the inner portion of the shutter and joined to the spring contacting portions of cartridge case via a spring. The spring contacting portions of the cases consist of the surfaces of a contacting wall, and upper and lower walls extending from the contacting wall, the lower wall being provided with a spring dislocation preventing projection.

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Hyogo, Japan

Seiichi Ohta