Patents Examined by Fayez Assai
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Patent number: 6445482Abstract: An optical scanning apparatus for optically scanning a surface to be scanned at a constant velocity includes a light source for emitting a light flux, a first optical lens system for coupling the light flux emitted by the light source to a subsequent optical lens system, a second optical lens system for forming the light flux received from the first optical lens system into a line image extending in a direction corresponding to a main scanning direction for the surface to be scanned, an optical deflector for deflecting the light flux formed as the line image via a deflecting reflective plane thereof, which is located near where the line image is formed, and a third optical lens system for condensing the deflected light flux as an optical beam spot on the surface to be scanned.Type: GrantFiled: January 17, 2002Date of Patent: September 3, 2002Assignee: Ricoh Technology Research, Inc.Inventor: Yoshinori Hayashi
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Patent number: 6408120Abstract: A fiber array subassembly for use with a two-dimension MEMS mirror array comprises a plurality of separate substrate elements (for example, silicon substrates) stacked one upon the other and formed to include via holes that, upon stacking, form the fiber array apertures. By controlling the via location on each substrate element, precise registration between the location of each optical device in the array (such as mirror elements in a MEMS arrangement) and the communication fibers can be achieved. The stack of substrates may also be formed to including a “mechanical stop” for each fiber, ensuring a precise separation between each fiber endface and its associated lensing elements.Type: GrantFiled: October 20, 1999Date of Patent: June 18, 2002Assignee: Agere Systems Guardian Corp.Inventor: Mindaugas Fernand Dautartas
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Patent number: 6381379Abstract: An optical modulator includes a substrate having an electrooptic effect, an optical waveguide having first and second cascading portions in the substrate, and transmitting an optical field, a first coplanar strip electrode having a first part over the first cascading portion and second and third parts extending beyond the first cascading portion, wherein the first part is approximately perpendicular to the second and third parts and has a width substantially the same as the first cascading portion, a second coplanar strip electrode having a first part over the second cascading portion and second and third parts to extend beyond the second cascading portion, and the first part being approximately perpendicular to the second and third parts, and a voltage source supplying a voltage to the first coplanar strip electrode, wherein the second coplanar strip electrode is grounded and is symmetrical to the first coplanar strip electrode.Type: GrantFiled: February 10, 2000Date of Patent: April 30, 2002Assignee: Codeon CorporationInventor: William K. Burns
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Patent number: 6243507Abstract: Integrated connection-verification system for use in a micro-electro-mechanical system (MEMS) crossconnect device. The system uses application of a dithering signal such as a sinusoidal bias to an electrode plate associated with a micro-mirror switching element to dither the micro-mirror. The optical signal from the dithering micro-mirror is fed through a beam splitter, a portion of the optical signal thus being directed to a photodetector. If intensity modulation in the optical signal corresponding to the frequency of the dithering signal is detected by the photodetector associated with the micro-mirror, the connection path between the desired input and output ports is verified.Type: GrantFiled: December 27, 1999Date of Patent: June 5, 2001Assignee: AT&T Corp.Inventors: Evan Lee Goldstein, Lih-Yuan Lin, Leda Maria Lunardi
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Patent number: 6069738Abstract: An optical system for providing an in-focus, extended depth of field image on a projection surface includes an encoded mask or light encoder for preceding the light to include object information (or, equivalently, information about the desired image), and an extended depth of field (EDF) mask, for extending the depth of field of the projection system. In addition to including object information, the encoded mask encodes the light from the light source to account for the variations introduced by the EDF mask in extending the depth of field, so that no post processing is required.Type: GrantFiled: May 7, 1999Date of Patent: May 30, 2000Assignee: University Technology CorporationInventors: Wade Thomas Cathey, Jr., Edward Raymond Dowski, Jr.
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Patent number: 6067182Abstract: An optical scanning device for scanning over a scanned surface in a main scanning direction with a plurality of light beam at the same time, which comprises a light source section having a plurality of light emitting sources that can be driven separately, a deflector for deflecting the plural light beams emitted from the light emitting sources, and an image formation optical system for focusing the light beams on the scanned face, the image formation optical system having an image formation magnification along the main scanning direction which is equal to or less than an image formation magnification along a sub scanning direction perpendicular to the main scanning direction.Type: GrantFiled: December 31, 1998Date of Patent: May 23, 2000Assignee: Fuji Xerox Co., Ltd.Inventor: Hidetsugu Narisawa