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US 6,632,574 B1Granted
Mask having pattern areas whose transmission factors are different from each other
AssigneeCanon Kabushiki Kaisha
InventorMitsuro Sugita
Life of this patent
Estimating the term…
Abstract
A mask is composed of a substrate, and a pattern having a transmission factor formed on the substrate by using a material, wherein an optical path length difference between light beams respectively passing the pattern and an area adjacent thereto is greater than ( m - 1 8 ) λ and less than ( m + 1 8 ) λ , where λ is a wavelength of incident light, and m is an integer.
Claims16
A mask comprising:
- a substrate transparent for an exposure beam;
- and
- a member translucent for said exposure beam formed on said transparent substrate, the transmission factor of said translucent member being different from a transmission factor of said transparent substrate, wherein a difference between an optical path length of said exposure beam passing through said transparent substrate and said translucent member and an optical path length of said exposure beam passing through said transparent substrate and the space adjacent to said translucent member on said transparent substrate is greater than (m−1/8)λ and less than (m+1/8)λ, where λ is a wavelength of the exposure beam and m is an integer.
A reflection type mask in which an exposure beam reflected therein is used for exposure of a substrate, the mask comprising:
- a substrate;
- and
- a reflective member having a reflection factor for said exposure beam formed on said substrate, the reflection factor being different from a reflection factor in a reflective area adjacent to said reflective member, wherein an optical path length difference between an exposure beam respectively reflecting in said reflective member and the reflective area is greater than (m−1/8)λ and less than (m+1/8)λ, where λ is a wavelength of the exposure beam and m is an integer.
A mask comprising:
- a substrate transparent for an exposure beam;
- and
- a first member and a second member each translucent for said exposure beam and adjacent to each other, the transmission factors of said first and second members being different from each other, wherein a difference between an optical path length of an exposure beam passing through said transparent substrate and said first member and an optical path length of an exposure beam passing through said transparent substrate and said second member is greater than (m−1/8)λ and less than (m+1/8)λ, where λ is a wavelength of the exposure beam and m is an integer.
A mask according to 12, claim herein the wavelength k is in the following range:
- 150 nm<λ<440 nm.
Dependencies are inferred from the claim text.