Optical exposure method

Details Optical exposure method Optical exposure method

1995-08-01

1997-03-04

Caldarola, Glenn A.

Radiation imagery chemistry: process, composition, or product th

Effecting frontal radiation modification during exposure,...

395 52, 395 71, 395 77, 359618, G03C 504, G03B 2732, G03B 2772, G03B 2768

Patent

active

056078218

ABSTRACT:
An optical exposure method in photolithography applied for precise processing when semiconductor devices are produced. A pattern on a photomask is projected and exposed on a register on a base plate with an exposure device including a deformation illumination system, a photomask and a projection lens. The deformation illumination system is composed of a light source, a diaphragm and a condenser lens, and the diaphragm is provided with a linear through-hole. The optical exposure method uses a ray of linear light for illumination or two rays of linear light for illumination that are parallel with the pattern. The two rays of linear light are symmetrical with respect to an optical axis. These rays are parallel with the pattern in a position separate from the optical axis of the exposure device when the photomask pattern is a line and space pattern.

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