Boots – shoes – and leggings
Patent
1993-06-01
1995-11-07
Ramirez, Ellis B.
Boots, shoes, and leggings
430 5, G06F 900
Patent
active
054652200
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.
REFERENCES:
patent: 4440839 (1984-04-01), Mottier
patent: 4593351 (1986-06-01), Hong et al.
patent: 5326659 (1994-07-01), Liu et al.
"Photolithography System Using Annular Illuminaton", Kamon et al., Japanese Journal of Applied Physics, vol. 30, No. 11B, Nov. 1991, pp. 3021-3029.
"Improving Projection Lithography Image Illumination by Using Sources Far from the Optical Axis", Asai et al., Journal of Vacuum Science & Technology, Part B, vol. 9, No. 6, Nov. 1991, pp. 2788-2791.
Asai Satoru
Hanyu Isamu
Haruki Tamae
Nakagawa Kenji
Taguchi Masao
Fujitsu Limited
Ramirez Ellis B.
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