| 摘要 |
There is disclosed a block piece (40) for holding an optical workpiece, in particular a spectacle lens (L), for machining thereof, which block piece comprises a basic body (42) which has an end face (44), against which the workpiece can be blocked by means of a temporarily deformable material (46), and a clamping face (48) via which the workpiece blocked on the basic body (42) can be fixed on a spindle (50) of a machining machine. According to the invention, the basic body is injection-molded from plastic and is provided on its end face with at least two cut-outs (52) for receiving the temporarily deformable material, said cut-outs being arranged on either side of an imaginary plane which contains the central axis (M) of the basic body, and the boundary face (54) of said cutouts which is closest to the central axis of the basic body in each case forms an undercut. As a result, a block piece of simple and very cost-effective design is provided, against which block piece the workpiece can be fixed in a reliable manner by means of the temporarily deformable material and in such a way that the workpiece remains on the block piece durably without play.
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