Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2000-05-03
2002-12-17
Lee, John D. (Department: 2874)
Optical waveguides
With optical coupler
Switch
Reexamination Certificate
active
06496612
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to electronic and optical switches. More specifically, the present invention relates to latching micro-magnetic switches with low power consumption and to methods of formulating and operating micro-magnetic switches.
BACKGROUND OF THE INVENTION
Switches are typically electrically controlled two-state devices that open and close contacts to effect operation of devices in an electrical or optical circuit. Relays, for example, typically function as switches that activate or de-activate portions of electrical, optical or other devices. Relays are commonly used in many applications including telecommunications, radio frequency (RF) communications, portable electronics, consumer and industrial electronics, aerospace, and other systems. More recently, optical switches (also referred to as “optical relays” or simply “relays” herein) have been used to switch optical signals (such as those in optical communication systems) from one path to another.
Although the earliest relays were mechanical or solid-state devices, recent developments in micro-electro-mechanical systems (MEMS) technologies and microelectronics manufacturing have made micro-electrostatic and micro-magnetic relays possible. Such micro-magnetic relays typically include an electromagnet that energizes an armature to make or break an electrical contact. When the magnet is de-energized, a spring or other mechanical force typically restores the armature to a quiescent position. Such relays typically exhibit a number of marked disadvantages, however, in that they generally exhibit only a single stable output (i.e. the quiescent state) and they are not latching (i.e. they do not retain a constant output as power is removed from the relay). Moreover, the spring required by conventional micro-magnetic relays may degrade or break over time.
Another micro-magnetic relay is described in U.S. Pat. No. 5,847,631 issued to Taylor et al. on Dec. 8, 1998, the entirety of which is incorporated herein by reference. The relay disclosed in this reference includes a permanent magnet and an electromagnet for generating a magnetic field that intermittently opposes the field generated by the permanent magnet. Although this relay purports to be bi-stable, the relay requires consumption of power in the electromagnet to maintain at least one of the output states. Moreover, the power required to generate the opposing field would be significant, thus making the relay less desirable for use in space, portable electronics, and other applications that demand low power consumption.
A bi-stable, latching switch that does not require power to hold the states is therefore desired. Such a switch should also be reliable, simple in design, low-cost and easy to manufacture, and should be useful in optical and/or electrical environments.
REFERENCES:
patent: 4065677 (1977-12-01), Micheron et al.
patent: 4461968 (1984-07-01), Kolm et al.
patent: 4570139 (1986-02-01), Kroll
patent: 5016978 (1991-05-01), Fargette et al.
patent: 5398011 (1995-03-01), Kimura et al.
patent: 5472539 (1995-12-01), Saia et al.
patent: 5475353 (1995-12-01), Roshen et al.
patent: 5629918 (1997-05-01), Ho et al.
patent: 5818316 (1998-10-01), Shen et al.
patent: 5838847 (1998-11-01), Pan et al.
patent: 5847631 (1998-12-01), Taylor et al.
patent: 5945898 (1999-08-01), Judy et al.
patent: 6016095 (2000-01-01), Qiu et al.
patent: 6028689 (2000-02-01), Michalicek et al.
patent: 6084281 (2000-07-01), Fullin et al.
patent: 6094116 (2000-07-01), Tai et al.
patent: 6094293 (2000-07-01), Yokoyama et al.
patent: 6124650 (2000-09-01), Bishop et al.
patent: 6143997 (2000-11-01), Feng et al.
patent: 6160230 (2000-12-01), McMillan et al.
patent: 6201629 (2001-03-01), McClelland et al.
patent: 6256430 (2001-07-01), Jin et al.
patent: 6269201 (2001-07-01), Ko et al.
patent: 6278812 (2001-08-01), Lin et al.
patent: 19 820821 (1999-12-01), None
patent: 0 780 858 (1997-06-01), None
patent: 0 869 519 (1998-10-01), None
patent: 06251684 (1994-09-01), None
patent: 97 39468 (1997-10-01), None
patent: 98 34269 (1998-08-01), None
patent: 99 27548 (1999-06-01), None
William P. Taylor, Oliver Brand, Mark G. Allen, “Fully Integrated Magnetically Actuated Micromachined Relays”, Journal of Microelectromechanical Systems, vol. 7, No. 2, Jun. 1998, pp. 181-191.
John A. Wright, Yu Chong Tai, and Shinh Chia Chang, “Large-Force, Fully-Integrated MEMS Magnetic Actuator,” 1997 International Conference on Solid-State Sensors, and Actuators, Chuicago, Jun. 1997, pp. 793-796.
Tilmans, et al., “A Fully-Packaged Electromagnetic Microrelay”, IEEE 1999, pp. 25-30.
Xi-Qing Sun, K.R. Farmer, and W.N. Carr, “A Bistable Microrelay Based on Two-Segment Multimorph Catilever Actuators”, 1998 IEEE, pp. 154-159.
Ezekiel J.J Kruglick and Kristofer S.J. Pister, “Bistable MEMS Relays and Contact Characterization”, Hilton Head 98 and 19th International Conference on Electric contact Phenomena, 5 pgs. (1998).
Chong H. Ahn and Mark G. Allen, “A Fully Integrated Micromagnetic Actuator With a Multilevel Meander Magnetic Actuator With a Multilevel Meander Magnetic Core”, Jun. 1992, IEEE Solid-State Sensor and Actuator Workshop, pp. 14-17.
William P. Taylor and Mark G. Allen, “Integrated Magnetic Microrelays: Normall Open, Normall Closed, and Multi-Pole Devices”, Jun. 1997, IEEE International Conference on Solid-State Sensors and Actuators, pp. 1149-1152.
Jack W. Judy and Richard S. Muller, “Magnetically Actuated, Addressable Microstructures”, Sep. 1997, Journal of Microelectromechanical Systems, vol. 6, No. 3, Sep. 1997, pp. 249-255.
John A. Wright and Yu-Chong Tai, “Micro-Minature Electromagnetic Switches Fabricated Using MEMS Technology”, 46th Annual Interantional Relay Conference: NARM '98, Apr. 1998.
John A. Wright, Yu-Chong Tai and Gerald Lilienthal, “A Magnetostatic MEMS Switch for DC Brushless Motor Commutation”, Solid State Source and Actuator Workshop 1998, Jun. 1998.
Laure K. Lagorce, Oliver Brand, and Mark G. Allen, “Magnetic Microactuators Based on Polymer Magnets”, IEEE Journal of Microelectromechanical Systems, vol. 8, No. 1, Mar. 1999, pp. 2-9.
E. Fullin, J. Gobet, H.A.C. Tilmans, and J. Bergqvist, “A New Basic Technology for Magnetic Micro-Actuators”, pp. 143-147, undated.
“P10D Ekectricity & Magnetism Lecture 14”, Internet Source: http://scitec.uwichill.edu.bb/cmp/online/P10D/Lecture14/lect14.htm. Jan. 3, 2000, pp. 1-5.
Richard P. Feynman, There's Plenty of Room at the Bottom:, Dec. 29, 1959, pp. 1-12, Internet Source: http://www.zyvex.com
anotech/feynman.html.
William Trimmer, “The Scaling of Micromechanical Devices”, Sensors and Actuators, vol. 19, No. 3, Sep. 1989, pp. 267-287, taken from the Internet source: http://home.earthlink.net/-trimmerw/mems/scale.html.
“Ultraminature Magnetic Latching To-5 Relays SPDT DC to C Band” Series RF 341, Product information of Teledyne Relays, 1998.
Ruan Meichun
Shen Jun
Wheeler Charles
Arizona State University
Snell & Wilmer L.L.P.
Song Sarah U
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