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US6048648A Mask including optical shield layer having variable light transmittance 失效
面罩包括具有可变透光率的光屏蔽层

Mask including optical shield layer having variable light transmittance
摘要:
In a mask including an optical shield layer formed on a transparent substrate, the light transmittance of the shield layer is changed in accordance with the density of patterns of the shield layer or the thickness of a photoresist layer on a semiconductor substrate.
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