Patents by Inventor Kai Chang Lu
Kai Chang Lu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240107414Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for switching a secondary cell to a primary cell. A user equipment (UE) monitors a first radio condition of the UE for beams of a primary cell and a second radio condition for beams of one or more secondary cells configured for the UE in carrier aggregation. The UE transmits a request to configure a candidate beam of at least one candidate secondary cell as a new primary cell in response to the first radio condition not satisfying a first threshold and the second radio condition for the at least one candidate secondary cell satisfying a second threshold. A base station determines to reconfigure at least one secondary cell as the new primary cell. The base station and the UE perform a handover of the UE to the new primary cell.Type: ApplicationFiled: September 23, 2022Publication date: March 28, 2024Inventors: Yu-Chieh HUANG, Kuhn-Chang LIN, Jen-Chun CHANG, Wen-Hsin HSIA, Chia-Jou LU, Sheng-Chih WANG, Chenghsin LIN, Yeong Leong CHOO, Chun-Hsiang CHIU, Chihhung HSIEH, Kai-Chun CHENG, Chung Wei LIN
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Patent number: 8072687Abstract: A front projection display device includes an optical engine including an illumination system, an imaging system, and projection optics. The projection optics include a first lens group of negative refractive power that has at least one aspheric surface. The projection optics output an image at a half field angle of at least 45°, where the image has substantially no distortion. For example, when the first lens group is placed at a distance of less than 1 meter from a viewing screen, the output image has a size of about 40 inches diagonal or greater, and requires substantially no keystone correction. In other aspects, the optical engine can be implemented in a wall-mounted projection system, a multimedia system, a compact integrated monitor system, and a portable projection unit.Type: GrantFiled: November 30, 2010Date of Patent: December 6, 2011Assignee: 3M Innovative Properties CompanyInventors: Ernesto M. Rodriguez, Jr., Patricia M. Hughes, William E. Haushalter, Kai Chang Lu
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Patent number: 7864435Abstract: A front projection display device includes an optical engine including an illumination system, an imaging system, and projection optics. The projection optics include a first lens group of negative refractive power that has at least one aspheric surface. The projection optics output an image at a half field angle of at least 45°, where the image has substantially no distortion. For example, when the first lens group is placed at a distance of less than 1 meter from a viewing screen, the output image has a size of about 40 inches diagonal or greater, and requires substantially no keystone correction. In other aspects, the optical engine can be implemented in a wall-mounted projection system, a multimedia system, a compact integrated monitor system, and a portable projection unit.Type: GrantFiled: June 29, 2007Date of Patent: January 4, 2011Assignee: 3M Innovative Properties CompanyInventors: Ernesto M. Rodriguez, Jr., Patricia M. Hughes, William E. Haushalter, Kai Chang Lu
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Patent number: 7850311Abstract: A front projection display device having a projection module and a docking station. The docking station has a base. Further, the docking station can include an extendable arm attached to the base. The projection module contains an optical engine. The optical engine includes an illumination system, an imaging system, and a wide-angle projection lens. The optical engine outputs an image at a half field angle of at least 45°. The projected image has substantially no distortion and requires substantially no keystone correction.Type: GrantFiled: January 29, 2008Date of Patent: December 14, 2010Assignee: 3M Innovative Properties CompanyInventors: Ernesto M. Rodriguez, Jr., Patricia M. Hughes, William E. Haushalter, Kai Chang Lu, Steven G. Saxe
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Patent number: 7738190Abstract: A wide-angle projection lens module is provided, including a reflective convex aspheric mirror and a refractive lens group of positive refractive power. The following Conditions (1) to (2) are satisfied: 15<|Freflective/F|<25 ??Condition (1), and 1.5<|Frefractive/f|<2.0 ??(Condition (2), wherein, F is a focal length of the wide-angle projection lens module, Freflective is a focal length of the reflective convex mirror, and Frefractive is a focal length of the refractive lens group.Type: GrantFiled: September 27, 2008Date of Patent: June 15, 2010Assignee: Meistream International Optical Ltd.Inventor: Kai-Chang Lu
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Publication number: 20100079733Abstract: A wide-angle projection lens module is provided, including a reflective convex aspheric mirror and a refractive lens group of positive refractive power. The following Conditions (1) to (2) are satisfied: 15<|Freflective/F|<25??Condition (1); and 1.5<|Frefractive/F|<2.0??Condition (2), wherein, F is a focal length of the wide-angle projection lens module, Freflective is a focal length of the reflective convex mirror, and Frefractive is a focal length of the refractive lens group.Type: ApplicationFiled: September 27, 2008Publication date: April 1, 2010Applicant: MEISTREAM INTERNATIONAL OPTICAL LTD.Inventor: Kai-Chang Lu
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Publication number: 20080137040Abstract: A front projection display device having a projection module and a docking station. The docking station has a base. Further, the docking station can include an extendable arm attached to the base. The projection module contains an optical engine. The optical engine includes an illumination system, an imaging system, and a wide-angle projection lens. The optical engine outputs an image at a half field angle of at least 45°. The projected image has substantially no distortion and requires substantially no keystone correction.Type: ApplicationFiled: January 29, 2008Publication date: June 12, 2008Inventors: Ernesto M. Rodriguez, Patricia M. Hughes, William E. Haushalter, Kai Chang Lu, Steven G. Saxe
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Patent number: 7342723Abstract: A portable projection device comprises a housing, a handle, and an optical engine. The optical engine comprises an illumination source, an imaging system, and a wide angle projection lens that includes a first lens group of negative refractive power, the first lens group having at least one aspheric surface, a second lens group, and a third lens group of positive refractive power. For the wide angle projection lens, the following Conditions (1) to (4) are satisfied: |F1/F|?4.5 (Condition (1)); 2.5?|F2/F|?6.0 (Condition (2)); 3.8?|F3/F|?5.0 (Condition (3)); and 0.8?BFL/F?1.4 (Condition (4)). The portable projection device can be implemented as a personal gaming system and can also be configured as a portable, fully integrated video gaming system that allows gamers to plug in and play at nearly any location, with only a wall or other viewing surface being used to view the projected image.Type: GrantFiled: July 24, 2006Date of Patent: March 11, 2008Assignee: 3M Innovative Properties CompanyInventors: Ernesto M. Rodriguez, Jr., Patricia M. Hughes, Kai Chang Lu
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Publication number: 20070285624Abstract: A front projection display device includes an optical engine including an illumination system, an imaging system, and projection optics. The projection optics include a first lens group of negative refractive power that has at least one aspheric surface. The projection optics output an image at a half field angle of at least 45°, where the image has substantially no distortion. For example, when the first lens group is placed at a distance of less than 1 meter from a viewing screen, the output image has a size of about 40 inches diagonal or greater, and requires substantially no keystone correction. In other aspects, the optical engine can be implemented in a wall-mounted projection system, a multimedia system, a compact integrated monitor system, and a portable projection unit.Type: ApplicationFiled: June 29, 2007Publication date: December 13, 2007Inventors: Ernesto Rodriguez, Patricia Hughes, William Haushalter, Kai Chang Lu
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Patent number: 7271964Abstract: A front projection display device includes an optical engine including an illumination system, an imaging system, and projection optics. The projection optics include a first lens group of negative refractive power that has at least one aspheric surface. The projection optics output an image at a half field angle of at least 45°, where the image has substantially no distortion. For example, when the first lens group is placed at a distance of less than 1 meter from a viewing screen, the output image has a size of about 40 inches diagonal or greater, and requires substantially no keystone correction. In other aspects, the optical engine can be implemented in a wall-mounted projection system, a multimedia system, a compact integrated monitor system, and a portable projection unit.Type: GrantFiled: December 3, 2004Date of Patent: September 18, 2007Assignee: 3M Innovative Properties CompanyInventors: Ernesto M. Rodriguez, Jr., Patricia M. Hughes, William E. Haushalter, Kai Chang Lu
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Patent number: 7173777Abstract: A wide angle projection lens includes, in sequential order from an image side, a first lens group of negative refractive power, the first lens group having at least one aspheric surface, a second lens group, and a third lens group of positive refractive power. For the wide angle projection lens, the following Conditions (1) to (4) are satisfied: |F1/F|?4.5 (Condition (1)); 2.5?|F2/F|?6.0 (Condition (2)); 3.8?|F3/F|?5.0 (Condition (3)); and 0.8?BFL/F?1.4 (Condition (4)). An optical engine, including the wide angle projection lens, can be implemented in a projection display device.Type: GrantFiled: February 14, 2006Date of Patent: February 6, 2007Assignee: 3M Innovative Properties CompanyInventors: Kai Chang Lu, Patricia M. Hughes
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Patent number: 7126767Abstract: A wide-angle projection lens includes a first lens group of negative refractive power, the first lens group having at least one aspheric surface. The projection lens also includes a second lens group of substantially zero refractive power and a third lens group of positive refractive power. The projection lens satisfies the following three conditions: |F1/F|<4.0 (Condition (1)), |F2/F|>50 (Condition (2)) and |F3/F|<3.5 (Condition (3)). In these conditions, F is the focal length of the wide-angle projection lens; F1 is the focal length of the first lens group; F2 is the focal length of the second lens group; and F3 is the focal length of the third lens group. The wide-angle projection lens is used in a front projection display device.Type: GrantFiled: December 3, 2004Date of Patent: October 24, 2006Assignee: 3M Innovative Properties CompanyInventor: Kai Chang Lu
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Patent number: 7123426Abstract: A wide angle projection lens include a first lens group of negative refractive power that has at least one aspheric surface. The wide angle projection lens can output an image at a half field angle of at least 45°, where the image has substantially no distortion and requires little or no keystone correction. The wide angle projection lens can be part of an optical engine that can be implemented in rear projection or front projection display devices.Type: GrantFiled: March 25, 2005Date of Patent: October 17, 2006Assignee: 3M Innovative Properties CompanyInventors: Kai Chang Lu, Ernesto M. Rodriguez, Jr.
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Patent number: 6527394Abstract: The invention relates to objective arrangements for use in projection systems such as overhead projectors. An objective arrangement 10 provides a tilted image plane. The arrangement 10 is rotationally asymmetric by virtue of the third element 16 having a principal optical axis 22 which is displaced to one side, but parallel with the principal optical axes 20 of the first and second elements 12,14. This asymmetry has been found to correct aberrations introduced by a tilted Fresnel lens used in the projection arrangement.Type: GrantFiled: October 27, 1999Date of Patent: March 4, 2003Assignee: International Optics LimitedInventor: Kai Chang Lu