Patent
1989-08-17
1990-10-23
Bovernick, Rodney D.
G02B 306
Patent
active
049647040
ABSTRACT:
An improved optical system suitable for laser processing in semiconductor manufacture. The system is composed of three convex lenses. By suitably selecting the type of each of the lenses, a limited spherical aberration is obtained without compromising the numerical aperture.
REFERENCES:
patent: 4043641 (1977-08-01), Gottlieb
Bovernick Rodney D.
Gass Rebecca D.
Semiconductor Energy Laboratory Co,. Ltd.
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