Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Reexamination Certificate
2008-09-30
2008-09-30
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
C355S053000, C355S077000, C318S567000, C318S038000, C318S053000
Reexamination Certificate
active
11107231
ABSTRACT:
A stage assembly (220) that moves a work piece (200) a movement step (257) includes a first stage (238), a first mover assembly (242), a second stage (240), and a second mover assembly (244). The first mover assembly (242) moves the first stage (238) with a first acceleration profile (366) during the movement step (257) and the second mover assembly (244) moves the second stage (240) with a second acceleration profile (368) during the movement step (257) that is different than the first acceleration profile. For example, the second mover assembly (244) moves the second stage (240) during the movement step (257) with a higher maximum acceleration than the first mover assembly (242) moves the first stage (238) during the movement step (257). Further, the second mover assembly (244) moves the second stage (240) during the movement step (257) with a higher average acceleration than the first mover assembly (242) moves the first stage (238) during the movement step (257).
REFERENCES:
patent: 2004/0257548 (2004-12-01), Dams et al.
Brandt Michael
Broder James P.
Donovan Lincoln
Nikon Corporation
Roeder Steven G.
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