MEMS scanning mirror for laser scanner

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<ul><li><p>apphcation mechanism for </p><p>subsequent selective activation </p><p>upon heating. </p><p>Patent number: US 6149742 </p><p>Publication date: 2 1 November </p><p>2000 </p><p>Inventors: B.F. Carpenter, J.L. </p><p>Draper </p><p>Fabricating iron-cobalt </p><p>magnetostrictive alloy Applicant: Lucent Technologies, </p><p>USA </p><p>This relates to an alloy exhibiting </p><p>high magnetostriction in relatively </p><p>low applied magnetic fields which </p><p>can be formed in a relatively easy </p><p>manner and has desirable physical </p><p>properties. The Co-Fe alloy exhibits </p><p>a magnetostriction of at least 100 </p><p>times 10 sup -6 in a magnetic field </p><p>less than 400 Oe, advantageously in </p><p>a magnetic field less than 100 Oe. </p><p>The alloy is formed by plastically </p><p>deforming the alloy, for example, </p><p>by cold rolling, to a reduction in </p><p>cross-sectional area of at least 50%, </p><p>and then heat treating the alloy to </p><p>induce recrystallisation. This </p><p>combination of plastic deformation </p><p>and recrystallisation was found to </p><p>provide desirable grain growth and </p><p>microstructure. The resultant alloy </p><p>is useful in various device </p><p>components, such as transducers, </p><p>frequency filters, signal delay lines </p><p>and optical fibre grating devices. </p><p>Patent number: US 6153020 </p><p>Publication date: 28 November </p><p>2000 </p><p>Inventors: L-H. Chen, S. Jin, T.J. </p><p>KIemmer, H. Mavoori </p><p>Magnetically tunable and </p><p>latchable laser Applicant: Lucent Technologies, </p><p>Inc., USA </p><p>The invention provides a device </p><p>with an improved tunable laser </p><p>structure, the structure useful with </p><p>surface emitting lasers and capable </p><p>of exhibiting desirable latchability. </p><p>The tunable laser contains a laser </p><p>structure with a lower reflector, an </p><p>active laser region and an upper </p><p>reflector. The upper reflector </p><p>contains a non-movable reflector </p><p>portion located adjacent to the </p><p>active laser region and a movable </p><p>reflector portion located a spaced </p><p>distance from the non-movable </p><p>reflector portion. A magnetic </p><p>material is located either on a </p><p>surface of the movable reflector </p><p>portion or on a surface in contact </p><p>with the movable reflector portion, </p><p>and a programmable magnet is </p><p>located near the magnetic material. </p><p>The magnet is capable of inducing </p><p>controlled movement of the </p><p>magnetic material. This in turn </p><p>induces movement of the movable </p><p>reflector portion so that the spaced </p><p>distance between the movable </p><p>reflector portion and the non- </p><p>movable reflector portion is capable </p><p>of being adjusted. By adjusting this </p><p>spaced distance (i.e. the air gap </p><p>between the movable and non- </p><p>movable reflector portions), the </p><p>phase of reflection and thus the </p><p>laser output wavelength is </p><p>controlled. </p><p>Patent number: US 6154471 </p><p>Publication date: 28 November </p><p>2000 </p><p>Inventors: S. Jin, H. Mavoori </p><p>MEMS scanning mirror for </p><p>laser scanner Applicant: Intermec II Corp., USA </p><p>A light beam scanner comprises a </p><p>light source providing a beam of </p><p>light and a microelectromechanical </p><p>systems (MEMS) scanning mirror </p><p>that reflects the beam of light </p><p>through a light-transmissive </p><p>window. A light detector receives </p><p>the light that is reflected off a target </p><p>and passes back through the light- </p><p>transmissive window. The MEMS </p><p>scanning mirror oscillates to </p><p>provide a scan pattern to the beam </p><p>of light. The MEMS scanning </p><p>mirror comprises a resonate </p><p>transducer in order to oscillate the </p><p>reflective surface to provide a </p><p>desired scan pattern. </p><p>Patent number: US 6155490 </p><p>Publication date: 5 December 2000 </p><p>Znventor: H.S. Ackley </p><p>Two-way MR fluid valve Applicant: Lord Corporation, USA </p><p>This invention relates to a </p><p>controllable valve assembly </p><p>applicable in magnetorheological </p><p>(MR) fluid devices such as MR </p><p>mounts and MR dampers. The </p><p>valve assembly includes a valve </p><p>body containing a magnetic circuit </p><p>which carries magnetic flux $I, a </p><p>controllable passageway within the </p><p>magnetic circuit, a MR </p><p>(magnetically controlled) fluid </p><p>including soft-magnetic particles in </p><p>a liquid carrier contained in the </p><p>controllable passageway, a magnetic </p><p>flux generator, such as a wound </p><p>wire coil, generating magnetic flux </p><p>.phi. which is directed through the </p><p>MR fluid in the controllable </p><p>passageway thereby generating </p><p>rhzology changes causing </p><p>restriction in flow of MR fluid. In </p><p>one aspect, a one-way check valve is </p><p>operative with a passive passageway </p><p>which is arranged in parallel </p><p>relationship to the controllable </p><p>passageway. This provides </p><p>asymmetric damping across the </p><p>controllable valve, creating higher </p><p>pressure differentials in a first </p><p>direction and lower in a second </p><p>direction without rapidly </p><p>switching the current to the coil. In </p><p>another aspect, asymmetric </p><p>damping is provided by a </p><p>changeable gap formed by a </p><p>movable wall portion of the </p><p>controllable passageway. In a third </p><p>aspect, a first controllable </p><p>passageway provides controllable </p><p>flow in a first direction and a </p><p>second controllable passageway </p><p>provides controllable flow in a </p><p>second direction, thereby provide </p><p>asymmetry. In a fourth aspect, </p><p>asymmetry is provides by a variable </p><p>magnetic short which changes </p><p>magnetic circuit reluctance </p><p>dependent on flow direction. </p><p>Patent number: US 6158470 </p><p>Publication date: 12 December </p><p>2000 </p><p>Inventors: D.E. Ivers, J.D. Carlson, </p><p>M.R. Jolly, M.J. Chrzan, D.R. </p><p>Prindle, K.A. St. Clair </p><p>Magnetorheological grip Applicant: Lord Corporation, USA </p><p>A deformable grip has been </p><p>developed for handheld </p><p>implements such as writing pens </p><p>and other handheld equipment </p><p>such as shaving instruments, </p><p>medical instruments, sporting </p><p>equipment and similar articles. The </p><p>grip can be deformed in </p><p>conformance with the users hands </p><p>and fingers. The present grip </p><p>includes an elastomeric sleeve filled </p><p>with a magnetorheological fluid </p><p>and a magnetic field generator that </p><p>acts upon such fluid to adjust grip </p><p>deformability. In a preferred form </p><p>of the invention, the implement </p><p>body or other equipment handle is </p><p>configured to include a recessed </p><p>cavity within which the (MR) </p><p>fluid-filled sleeve is located. A </p><p>permanent magnet assembly is </p><p>disposed within the tubular sleeve </p><p>such that in an on-state of the </p><p>present grip, the magnetic flux field </p><p>extends radially to pass through the </p><p>(MR) fluid to solidify it </p><p>instantaneously in a relatively </p><p>nondeformable set condition in </p><p>conformance with the users </p><p>anatomical contours. In an off-state </p><p>of the grip, the magnetic flux field </p><p>is diverted from the (MR) fluid, </p><p>which reverts back to a soft, </p><p>deformable condition. The </p><p>deformability of the grip is </p><p>controlled by a sliding mechanical </p><p>mechanism within the pen. </p><p>Patent number: US 6 1589 10 </p><p>Publication date: 12 December </p><p>2000 </p><p>Inventors: M.R. Jolly, S.R. Bryan </p><p>ulletin </p><p>Next month </p><p>News Business activities </p><p>Technical developments </p><p>Industry trends </p><p>In Brief Breaking news </p><p>Related industries </p><p>Features Technical articles on </p><p>projects and developments </p><p>around the world </p><p>Research Trends The latest research </p><p>results published in </p><p>the key journals </p><p>Patents Recently published </p><p>US and WO patents </p><p>Smart Materials Bulletin March 2001 </p></li></ul>

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