Process and an apparatus for chip-cutting plastic material optical lenses
AssigneeCarl Zeiss Vision GmbH
InventorAdalbert Hanssen
Life of this patent
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Abstract
The invention concerns a process and an apparatus for chip-cutting plastic material optical lenses. The point of chip-cutting on the lens is cooled. The chip-cutting is effected by means of lathing. The point of chip-cutting is locally cooled down to a temperature at which the plastic material becomes brittle such that the chip breaks into bits.
Claims4
A process for working plastic material optical lenses, in which chips are cut from said lenses, wherein said chip-cutting is effected by means of lathing, wherein the chips are generated at a point of chip-cutting where the lathing means engages the lens, and punctually cooling down only the chips at the point of chip-cutting to a temperature at which said plastic material becomes brittle and guiding said chips onto a chip guide such that the chips break into bits;
- wherein said punctual cooling is performed by directing a thin jet of cooling gas only onto said chips at the point of chip-cutting as said chips are formed by the lathing process such that the lens itself is not substantially cooled.
A process for working plastic material optical lenses, in which chips are cut from said lenses, wherein said chip-cutting is effected by means of a mechanical lathing tool having a cutting tip, wherein the chips are generated at a point of chip-cutting where the cutting tip engages the lens, wherein only the chips at the point of chip-cutting is punctually cooled down to a temperature at which said plastic material becomes brittle and guiding said chips onto a chip guide such that the chips break into bits, and further wherein said punctual cooling is performed by directing a thin jet of cooling gas only onto said at the point of chip-cutting as said chips are formed by the lathing process such that the lens itself is not substantially cooled.
Dependencies are inferred from the claim text.