Apparatus for making a plurality of optical record disc subtrates
AssigneeTDK Corporation
InventorsSeiki Shimazu, Kenji Yamaga, Yoshimi Sakai, Atsushi Koyama, Yuichi Namikawa
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Abstract
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.
Claims7
An apparatus for making a plurality of optical record disc substrates, the apparatus comprising:
- a fixed mold half;
- a movable mold half;
- a plurality of slidable core bodies which are provided in the movable mold half to form a plurality of cavities between the fixed mold half and the movable mold half;
- and
- a plurality of actuation mechanisms, each actuation mechanism cooperating with a respective one of said plurality of core bodies, each actuation mechanism including a hydraulic cylinder for sliding a respective one of said cooperating core bodies, and a hydraulic control circuit having a hydraulic pressure control valve for controlling the corresponding hydraulic cylinder;
- wherein each of the hydraulic control circuits independently control an actuation of the respective core bodies by said actuation mechanisms in a multistage manner by combining a control of a hydraulic pressure supplied to said hydraulic cylinder and a timing of the supply of hydraulic pressure to said hydraulic cylinder.
An apparatus for making a plurality of optical record disc substrates, the apparatus comprising:
- a fixed mold half;
- a movable mold half;
- a plurality of slidable core bodies provided in the movable mold half;
- a driving means for opening and closing the movable mold half with respect to the fixed mold half;
- a plurality of cavities which are formed between the movable mold half and the fixed mold half;
- an injection means for injecting a resin material into respective cavities of said plurality of cavities;
- and
- a plurality of cut punches which come in and out of the respective cavities to punch a hole in a center of discs formed in the core bodies;
- wherein 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 hydraulic actuation means for actuating said driving means, said apparatus further comprising control means for controlling an actuation of the hydraulic actuation means independently so as to control an application of hydraulic pressure to said driving means and a timing of the application of hydraulic pressure, so as to permit a uniform injection of resin material in each one of said cavities.
Dependencies are inferred from the claim text.