Method of making replicas while preserving master

Details Method of making replicas while preserving master Method of making replicas while preserving master

1998-03-31

2000-12-12

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

264 136, 264 137, 264102, 264225, B29D 1100

Patent

active

061593982

ABSTRACT:
An improved method of making laminated optical components through the use of a master and several submasters is disclosed. A glass/photoresist master is made by recording optical surface features in the photoresist with coherent or incoherent light. The master is processed to reveal the surface features. A frame is fastened to the edges of the photoresist/glass master with edges rising slightly above the top surface of the master. Silicone rubber is poured into the frame over the photoresist layer and allowed to cure. The silicone rubber submaster is then separated from the photoresist/glass master. Use of silicon rubber permits separation of the submaster without damaging the master. Additionally, silicone rubber is less prone to shrinkage than prior art submasters thus permitting more accurate copying of the surface features of the photoresist/glass master. Subsequent epoxy replicas may then be made from the silicone rubber submaster.

REFERENCES:
patent: 4044939 (1977-08-01), Horst et al.
patent: 4567123 (1986-01-01), Ohtaka et al.
patent: 4832966 (1989-05-01), Newsteder
patent: 5071597 (1991-12-01), D'Amato et al.
patent: 5183597 (1993-02-01), Lu
patent: 5609939 (1997-03-01), Petersen et al.

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