Leybold Systems Gmbh

Stefan Szellas

Andreas Rack

Peter Sauer

Apparatus for the gluing of two substrates in six processing steps for fabrication of a digital video disc including a motor-driven plate (,) for holding the first substrate (,), a glue dispenser disposed above the plate (,), grasping and holding device for providing vertical movement of the second substrate (,). The side of the plate turned toward the first substrate (,) has a radially outer plane portion (,) in the form of a disk concentric to its axis of rotation (R) and a radially inner portion (,) adjacent to this where the face (F) of this inner portion (,) turned toward the substrate (,) is formed by the outer face of a flat, straight frustum of a cone whose peak (S) strikes the axis of rotation (R) below the plane of application (E) of the substrate (,). In the transitional area from the annular portion (,) to the conical portion (,) an annular groove (,) running coaxially to the axis of rotation is cut into the plate (,) which is connected to a pressure source via channels (,&prime;, . . . ) and corresponds to teardrop or finger-like indentations or recesses (,&prime;, . . . ) in the conical portion (,) extending from the annular groove (,) radially inward.

Process for the adhesion of a flat plastic substrate in the form of a circular disk to a like second substrate for a digital video disc and apparatus for implementation of the process

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Langwedel, Germany

Stefan Szellas