mems scanning mirror for laser scanner

1
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 Next month News Business activities Technical developments Industry trends In Brief Breaking news Related industries Features Technical articles on projects and developments around the world Research Trends The latest research results published in the key journals Patents Recently published US and WO patents Smart Materials Bulletin March 2001

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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

Next month

News Business activities

Technical developments

Industry trends

In Brief Breaking news

Related industries

Features Technical articles on

projects and developments

around the world

Research Trends The latest research

results published in

the key journals

Patents Recently published

US and WO patents

Smart Materials Bulletin March 2001