Pentax 2002 Annual Report Download - page 10

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8
Mask Blanks
In manufacturing semiconductors, the circuit patterns are transferred to the sili-
con wafer using photomasks as a negative and an optical exposure device called
a stepper. Mask blanks are the originals of photomasks and indispensable to
semiconductor production. Hoya commands a 70% share of the world market
for mask blanks.
pc
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