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Inventor:
Li; Kenneth K.
Address:
Arcadia, CA
No. of patents:
48
Patents:












Patent Number Title Of Patent Date Issued
7618158 Illumination system using filament lamps November 17, 2009
An illumination system using filament lamps including a filament lamp, a reflector having a first and second focal points, the filament lamp disposed proximate to the first focal point of the reflector to emit rays of electromagnetic radiation that reflect from the reflector and converge
7452086 Light pipe based projection engine November 18, 2008
A light pipe based projection engine includes a X-prism transmitting substantially light of a useful polarization in an output direction and reflecting substantially light of a non-useful polarization in a first orthogonal direction substantially orthogonal to the output direction. An
7357550 LED illumination engine using a reflector April 15, 2008
An illumination engine for a projection display using light emitting diodes (LEDs) that includes a reflector having a first and second focal points, a source of electro-luminescence located proximate to the first focal point to emit rays of radiation in a first range of wavelengths t
7339735 Polarization recovery system for projection displays March 4, 2008
A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input
7338187 Multiple lamp illumination system March 4, 2008
An illumination system including a plurality of lamps, a plurality of first light reflectors, a plurality of second light reflectors, and an output light guide. Each of the first light reflectors is arranged to reflect light output from one of the lamps onto an input of one of the se
7232228 Light recovery for projection displays June 19, 2007
A light recovery system for a projection display with a reflector having a first and a second focal points. A source of electro-magnetic radiation is disposed proximate to the first focal point of the reflector to emit rays of radiation that reflect from the reflector and converge su
7213947 Multiple output illumination using reflectors May 8, 2007
A multiple output illumination system includes a first and second reflectors each having an optical axis and a first and second focal points substantially on the optical axis. In one embodiment, one of the focal points of each reflector are proximate to one another, while the other f
7172290 Light pipe based projection engine February 6, 2007
A light pipe based projection engine includes a X-prism transmitting substantially light of a useful polarization in an output direction and reflecting substantially light of a non-useful polarization in a first orthogonal direction substantially orthogonal to the output direction. An
7151874 Lensed tapered optical waveguide December 19, 2006
An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a curved surface such as a lens at the output of a tapered light pipe (TLP). The TLP in combination with the curved surface alters the divergence angle
7130122 Polarization recovery system for projection displays October 31, 2006
A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input
7092159 Polarization recovery system for projection displays August 15, 2006
A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input
7020368 Lensed tapered optical waveguide March 28, 2006
An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a curved surface such as a lens at the output of a tapered light pipe (TLP). The TLP in combination with the curved surface alters the divergence angle
7006288 Polarization recovery system for projection displays February 28, 2006
A light guide comprising three guide sections and a light coupling element between the light guide sections. The light coupling element having an internal polarizing surface for reflecting light of a predetermined polarization state. Each light guide section has an entrance aperture, an
7002745 Polarization recovery system for projection displays February 21, 2006
A polarization recovery system polarizes input light for use with an LCD imager. The polarization recovery system converts light of the wrong polarity to the correct polarity to add to the illumination of the LCD imager. The polarization recovery system may include: (1) an output wav
6982830 Polarization recovery system for projection displays January 3, 2006
A light guide comprising three guide sections and a light coupling element between the light guide sections. The light coupling element having an internal polarizing surface for reflecting light of a predetermined polarization state. Each light guide section has an entrance aperture, an
6969177 Polarization recovery system using redirection November 29, 2005
A polarization recovery system includes a polarizing beam splitter transmitting light of a useful polarization in an output direction and reflecting light of a non-useful polarization in a first orthogonal direction substantially orthogonal to the output direction. An initial reflect
6955452 Illumination system using filament lamps October 18, 2005
An illumination system using filament lamps including a filament lamp, a reflector having a first and second focal points, the filament lamp disposed proximate to the first focal point of the reflector to emit rays of electromagnetic radiation that reflect from the reflector and converge
6926435 Led illumination engine using a reflector August 9, 2005
An illumination engine for a projection display using light emitting diodes (LEDs) that includes a reflector having a first and second focal points, a source of electro-luminescence located proximate to the first focal point to emit rays of radiation in a first range of wavelengths that
6898353 Lensed tapered optical waveguide May 24, 2005
An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a curved surface such as a lens at the output of a tapered light pipe (TLP). The TLP in combination with the curved surface alters the divergence angle
6856727 Coupling of light from a non-circular light source February 15, 2005
A numerical aperture (NA) equalizing apparatus including a transmission element with an input surface, in which the input surface has a first input dimension and a second input dimension, with the second input dimension being substantially orthogonal to the first input dimension, and
6854864 Light pipe light source with flux condensing light pipe February 15, 2005
An optical device for increasing the brightness of electromagnetic radiation emitted by a source by folding the electromagnetic radiation back on itself. The source of electromagnetic radiation has a first width, a first input end of a first light pipe has a second width, and a second
6840623 Light recovery for projection displays January 11, 2005
A light recovery system for a projection display includes a reflector having a first and a second focal points. A source of electro-magnetic radiation at the first focal point emits rays of radiation that reflect from the reflector and converge substantially at the second focal point. A
6836576 Polarization recovery system using light pipes December 28, 2004
A polarization recovery system using light pipes has a reflector having a first and a second focal points. A source of electro-magnetic radiation is disposed proximate to the first focal point of the reflector to emit rays of light that reflect from the reflector and converge substantial
6829412 Lensed tapered optical waveguide December 7, 2004
An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a curved surface such as a lens at the output of a tapered light pipe (TLP). The TLP in combination with the curved surface alters the divergence angle
6739726 Illumination engine for a projection display using a tapered light pipe May 25, 2004
An illumination engine for a projection display using a TLP including a reflector having a first focal point and second focal points. A source of electro-magnetic radiation disposed proximate to the first focal point of the reflector emits rays of radiation that reflect from the reflecto
6672740 Condensing and collecting optical system using parabolic reflectors or a corresponding ellipsoid January 6, 2004
A condensing and collecting optical system includes a collimating reflector and focusing reflector. The collimating reflector includes a portion of a paraboloid of revolution having a focal point and an optical axis. The focusing reflector includes a paraboloid of revolution having a foc
6634759 Coupling of light from a light source to a target using dual ellipsoidal reflectors October 21, 2003
A condensing and collecting optical system includes a first reflector and second reflector. The first and second reflectors and includes a portion of an ellipsoid of revolution having two focal point and an optical axis. A source of electromagnetic radiation is placed at one of the focal
6626582 Snap-on connector system for coupling light from an illuminator to a fiber optic September 30, 2003
The present invention provides a connector assembly comprising (1) a first adapter that releasably connects to light source and transmits optical energy received from the light source along a first optical waveguide; (2) a second adapter that releasably connects to first adapter to recei
6619820 Light condensing and collecting systems using lensed light pipes September 16, 2003
An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a lens having a curved surface and a tapered light pipe. The curved surface reduces the angle of incidence of the light striking the input end of the
6616304 Temperature control for arc lamps September 9, 2003
A temperature control system for a source of electromagnetic radiation, such as an arc lamp, in a collecting and condensing system including a first reflector having a first focal point and a first optical axis, and a second reflector having a second focal point and a second optical axis
6595673 Coupling of high intensity light into low melting point fiber optics using polygonal homogenizer July 22, 2003
A fiber optic illumination system with increased power handling capabilities for low melting point fiber optics uses an optical homogenizer. Homogenizers of the present invention preferably comprise a rod with polygonal cross-section. The output intensity of the optical homogenizer i
6587269 Polarization recovery system for projection displays July 1, 2003
A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input
6565235 Folding an arc into itself to increase the brightness of an arc lamp May 20, 2003
An optical device for increasing the brightness of electromagnetic radiation emitted by a source by folding the electromagnetic radiation back on itself. The source of electromagnetic radiation has a first width, a first input end of a first light pipe has a second width, and a second
6496620 Method and apparatus for improving power handling capabilities of polymer fibers December 17, 2002
The power handling capability of polymer fibers is increased by broadening an input intensity profile, which is typically Gaussian, without significantly decreasing the efficiency of coupling light into a polymer fiber. The method for increasing the power handling capability of polymer
6385371 Optical system including coupling for transmitting light between a single fiber light guide and May 7, 2002
An optical system includes a coupling for transmitting light between one single fiber light guide and multiple single fiber light guides. The interface surfaces coupling the single fiber light guide to the multiple light guides have polygonal cross-sectional shapes, and the interface
6318885 Method and apparatus for coupling light and producing magnified images using an asymmetrical ell November 20, 2001
A method and system for condensing and collecting electromagnetic radiation comprised generally of a radiation source, a reflector and a target is disclosed. The reflector has a reflecting surface for reflecting the radiation from the source which is in the shape of a cut out portion of
6312144 Optical system having retro-reflectors November 6, 2001
A method and system for condensing and collecting electromagnetic radiation onto a target surface comprised generally of a radiation source, a primary reflector and a retro-reflector having a shape complementary to the shape of the primary reflector is disclosed. The primary reflector ha
6231199 Collecting and condensing optical system using cascaded parabolic reflectors May 15, 2001
An electromagnetic radiation collecting and condensing optical system includes a plurality of cascaded concave paraboloid reflectors and a plurality of electromagnetic radiation or light sources which radiate light energy onto the concave reflectors in such manner that the energy fro
6227682 Coupling of light from a small light source for projection systems using parabolic reflectors May 8, 2001
A portion of a first paraboloid collects and concentrates randomized light from a lamp into parallel beams directed to a portion of a second paraboloid which refocuses the light onto a homogenizer. The second paraboloid has a shape that is substantially similar to the first paraboloi
6157323 Button-key/cylindrical-key alphabetizer December 5, 2000
A multiple input key for inputting characters and the key has a body with a top and bottom surface, with the bottom surface being proximal to a printed circuit board and the top surface being distal from the printed circuit board. The key is pivotable about a pivot. A pivot extends from
6129662 Surgical tool with surgical field illuminator October 10, 2000
A surgical tool with surgical field illuminator includes a light-conveying fiber optic member having a body portion, a light-receiving end optically connectable to a source of light, and a light-delivering end. A surgical tool can be attached to, or surround, part of the body portion of
6089741 Apparatus and method for coupling high intensity light into low temperature optical fiber July 18, 2000
A method and apparatus for coupling high intensity light into a low melting temperature optical fiber which uses a high temperature, low NA optical fiber as a spatial filter between a source of high intensity light and a low melting temperature, low NA optical fiber. In an alternate embo
6065882 Snap-in proximal connector for mounting an optic fiber element into a light source system May 23, 2000
A proximal connector includes a stainless steel, cone-shaped ferrule enclosing a proximal end of the optic fiber element. The ferrule is inserted within a matching aperture of a receiving block, which is also made of stainless steel. The matching shapes of the ferrule and the apertur
5905830 Device for coupling a high intensity point source to a fiber bundle May 18, 1999
A method and apparatus which can couple a high intensity point source, such as from a single fiber, to a fiber bundle. A bundle of fibers is fed though a hole in the light post. A removable potting compound is applied to the tip of the bundle to hold the fibers together for polishing. Th
5881192 Method of coupling a high intensity point source to a fiber bundle March 9, 1999
A method and apparatus which can couple a high intensity point source, such as from a single fiber, to a fiber bundle. A bundle of fibers is fed though a hole in the light post. A removable potting compound is applied to the tip of the bundle to hold the fibers together for polishing. Th
5754719 Method for coupling light from single fiberoptic to a multi-fiber bundle with enhanced field uni May 19, 1998
A device which adjusts the angle of illumination of light exiting a fiber optic light guide. A first light guide has a first numerical aperture for emitting light from a light source, and light exiting the first light guide has a first light intensity angular profile. A second light guid
5751869 Optical system for coupling light from a single fiber optic into a fiber bundle May 12, 1998
The optical coupler couples light output from the single fiber optic into the fiber optic bundle while preserving the numerical aperture of the beam output from the single fiber optic. The optical coupler also preserves any uniformity in s the beam output from the single fiber optic. The
5635926 Pointing and/or directional control device for controlling the movement and positioning of an ob June 3, 1997
The present invention provides a pointing and/or directional control device for controlling movement and positioning of an object in at least two dimensions which, in the preferred embodiment, forms a cursor control device for use in a computer system. The device comprises at least a










 
 
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