Tdk Corporation

Tdk Electronics Company, Limited

Seiki Shimazu

Kenji Yamaga

Yoshimi Sakai

Atsushi Koyama

Masaoki Sekine

Yuichi Namikawa

A method of making a plurality of optical record disc substrates includes the steps of injecting a resin material into a plurality of disc-shaped cavities which are formed by closing a fixed mold half and a movable mold half; and cooling the injected resin material in the cavities. The cavities are grouped into a plurality of groups so that each group includes not less than one cavity, and each group is provided with a common actuation device so that each actuation device is independently operated.

Apparatus for making a plurality of optical record disc subtrates

Method of making a plurality of optical record disc substrates

A tape cover made of resin comprises a single-piece L-shaped body of an upper plate and a front plate and an erroneous insertion detecting notch formed in the joint of the plates, wherein a gate is formed in the notch and the thickness of the wall of a portion adjacent the notch in the upper plate is smaller than the distance from the edge of the upper plate to the most remote part of the diameter of the gate.

Tape cover of magnetic tape cassette and process for preparing tape cover

A tape cover formed by molding an L-shaped body of an upper plate and a front plate in one piece in which an erroneous insertion detecting notch is formed in the joint portion of both the plates comprises an injecting port as a gate positioned on a side surface of said upper plate in said notch, and the thickness of the wall of said upper plate just below said injecting port is larger than that of the other part of the wall of said upper plate near said injecting port wall.

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Tokyo, Japan

Seiki Shimazu