mems scanning mirror for laser scanner
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apphcation mechanism for
subsequent selective activation
upon heating.
Patent number: US 6149742
Publication date: 2 1 November
2000
Inventors: B.F. Carpenter, J.L.
Draper
Fabricating iron-cobalt
magnetostrictive alloy Applicant: Lucent Technologies,
USA
This relates to an alloy exhibiting
high magnetostriction in relatively
low applied magnetic fields which
can be formed in a relatively easy
manner and has desirable physical
properties. The Co-Fe alloy exhibits
a magnetostriction of at least 100
times 10 sup -6 in a magnetic field
less than 400 Oe, advantageously in
a magnetic field less than 100 Oe.
The alloy is formed by plastically
deforming the alloy, for example,
by cold rolling, to a reduction in
cross-sectional area of at least 50%,
and then heat treating the alloy to
induce recrystallisation. This
combination of plastic deformation
and recrystallisation was found to
provide desirable grain growth and
microstructure. The resultant alloy
is useful in various device
components, such as transducers,
frequency filters, signal delay lines
and optical fibre grating devices.
Patent number: US 6153020
Publication date: 28 November
2000
Inventors: L-H. Chen, S. Jin, T.J.
KIemmer, H. Mavoori
Magnetically tunable and
latchable laser Applicant: Lucent Technologies,
Inc., USA
The invention provides a device
with an improved tunable laser
structure, the structure useful with
surface emitting lasers and capable
of exhibiting desirable latchability.
The tunable laser contains a laser
structure with a lower reflector, an
active laser region and an upper
reflector. The upper reflector
contains a non-movable reflector
portion located adjacent to the
active laser region and a movable
reflector portion located a spaced
distance from the non-movable
reflector portion. A magnetic
material is located either on a
surface of the movable reflector
portion or on a surface in contact
with the movable reflector portion,
and a programmable magnet is
located near the magnetic material.
The magnet is capable of inducing
controlled movement of the
magnetic material. This in turn
induces movement of the movable
reflector portion so that the spaced
distance between the movable
reflector portion and the non-
movable reflector portion is capable
of being adjusted. By adjusting this
spaced distance (i.e. the air gap
between the movable and non-
movable reflector portions), the
phase of reflection and thus the
laser output wavelength is
controlled.
Patent number: US 6154471
Publication date: 28 November
2000
Inventors: S. Jin, H. Mavoori
MEMS scanning mirror for
laser scanner Applicant: Intermec II’ Corp., USA
A light beam scanner comprises a
light source providing a beam of
light and a microelectromechanical
systems (MEMS) scanning mirror
that reflects the beam of light
through a light-transmissive
window. A light detector receives
the light that is reflected off a target
and passes back through the light-
transmissive window. The MEMS
scanning mirror oscillates to
provide a scan pattern to the beam
of light. The MEMS scanning
mirror comprises a resonate
transducer in order to oscillate the
reflective surface to provide a
desired scan pattern.
Patent number: US 6155490
Publication date: 5 December 2000
Znventor: H.S. Ackley
Two-way MR fluid valve Applicant: Lord Corporation, USA
This invention relates to a
controllable valve assembly
applicable in magnetorheological
(MR) fluid devices such as MR
mounts and MR dampers. The
valve assembly includes a valve
body containing a magnetic circuit
which carries magnetic flux $I, a
controllable passageway within the
magnetic circuit, a MR
(magnetically controlled) fluid
including soft-magnetic particles in
a liquid carrier contained in the
controllable passageway, a magnetic
flux generator, such as a wound
wire coil, generating magnetic flux
.phi. which is directed through the
MR fluid in the controllable
passageway thereby generating
‘rhzology’ changes causing
restriction in flow of MR fluid. In
one aspect, a one-way check valve is
operative with a passive passageway
which is arranged in parallel
relationship to the controllable
passageway. This provides
‘asymmetric’ damping across the
controllable valve, creating higher
pressure differentials in a first
direction and lower in a second
direction without ‘rapidly
switching’ the current to the coil. In
another aspect, ‘asymmetric’
damping is provided by a
‘changeable gap’ formed by a
movable wall portion of the
controllable passageway. In a third
aspect, a first controllable
passageway provides controllable
flow in a first direction and a
second controllable passageway
provides controllable flow in a
second direction, thereby provide
asymmetry. In a fourth aspect,
asymmetry is provides by a ‘variable
magnetic short’ which changes
magnetic circuit reluctance
dependent on flow direction.
Patent number: US 6158470
Publication date: 12 December
2000
Inventors: D.E. Ivers, J.D. Carlson,
M.R. Jolly, M.J. Chrzan, D.R.
Prindle, K.A. St. Clair
Magnetorheological grip Applicant: Lord Corporation, USA
A deformable grip has been
developed for handheld
implements such as writing pens
and other handheld equipment
such as shaving instruments,
medical instruments, sporting
equipment and similar articles. The
grip can be deformed in
conformance with the user’s hands
and fingers. The present grip
includes an elastomeric sleeve filled
with a magnetorheological fluid
and a magnetic field generator that
acts upon such fluid to adjust grip
deformability. In a preferred form
of the invention, the implement
body or other equipment handle is
configured to include a recessed
cavity within which the (MR)
fluid-filled sleeve is located. A
permanent magnet assembly is
disposed within the tubular sleeve
such that in an on-state of the
present grip, the magnetic flux field
extends radially to pass through the
(MR) fluid to solidify it
instantaneously in a relatively
nondeformable set condition in
conformance with the user’s
anatomical contours. In an off-state
of the grip, the magnetic flux field
is diverted from the (MR) fluid,
which reverts back to a soft,
deformable condition. The
deformability of the grip is
controlled by a sliding mechanical
mechanism within the pen.
Patent number: US 6 1589 10
Publication date: 12 December
2000
Inventors: M.R. Jolly, S.R. Bryan
ulletin
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