1990:
1970s:
Introduced
the U500 ISA PC-bus-based motion con-
Introduced
first ball-screw-based positioning systems
troller
and the UNIDEX 511 stand-alone, multi-axis motion
with
advanced linear servo drives. This represented a revolu-
controller.
tionary
advancement in system throughput - five times better
than
lead screw and stepper motor technology. Adapted and
1991:
Patent on successive fringe detection position interfer-
widely
deployed by IBM, DuPont, and Westinghouse. Patent
ometry
(U.S. Patent #5,018,862). Introduced AOM series
on
coarse and fine adjustment positioning mechanism (U.S.
AZ/EL
optical mounts.
Patent
#3,727,471). Established subsidiary in Germany.
1992:
Patent on quadrature error correction (U.S. Patent
1980s:
Introduced UNIDEX series microprocessor-based
#5,134,404).
Introduced the BLM series linear brushless
motion
controllers. Developed brushless amplifier and rotary
motors.
motors
which increased throughput, reliability, and
1993:
Introduced the BM series brushless rotary motors.
decreased
maintenance. Patents on a switching amplifier
with
MOSFET driver circuit (U.S. Patent #4,554,512), a
1994:
Introduced the ABL8000 air-bearing stage and BA
milling
machine tool changer (U.S. Patent #4,426,763), a
Series
amplifiers.
microstepping
translator controller (U.S. Patent #4,652,806),
1995:
Introduced the ALS2000 linear motor stages series.
and
for closed-loop torque angle control of a synchronous
Developed
the ABL9000 H-bridge air-bearing stage.
motor
(U.S. Patent #4,884,016). Established subsidiary in
the
United Kingdom.