Chris H Jenson

US Patent:

7164819, Jan 16, 2007

Filed:

Mar 10, 2004

Appl. No.:

10/797383

Inventors:

Chris H. Jenson - Twinsburg OH, US
John M. Davenport - Middleburg Heights OH, US
Brian Doucet - Akron OH, US

Assignee:

Fiberstars, Inc. - Solon OH

International Classification:

G02B 6/26

US Classification:

385 39

Abstract:

A light pipe with side-light extraction by light pipe-surface alteration includes an optical light pipe with a plastic light-carrying portion covered with a fluoropolymer cladding. A plurality of light-extraction devices is spaced along an active section of the light pipe for emission of side light over only a range from about 2 to 270 degrees of the cross-sectional circumference of the light pipe in the active section. The light-extraction devices have inlets passing through the cladding and optically contacting the plastic light-carrying portion. Another form of light pipe with side-light extraction by light pipe-surface alteration includes an optical light pipe with a plastic light-carrying portion. An active section of the light pipe for side light emission comprises an axisymmetrical change of area of cross section of the light pipe that generally diminishes from an inlet end of the active section, through the active section.

US Patent:

7190863, Mar 13, 2007

Filed:

Mar 10, 2004

Appl. No.:

10/797859

Inventors:

Gregory P. Frankiewicz - Mayfield Heights OH, US
Chris H. Jenson - Twinsburg OH, US
John M. Davenport - Middleburg Heights OH, US
Dave Bina - Northfield Center OH, US

Assignee:

Fiberstars, Inc. - Solon OH

International Classification:

G02B 6/26
G02B 6/30
G02B 6/42
G02B 6/38

US Classification:

385 49, 385 50, 385 58, 385 70, 385 51

Abstract:

A solid light pipe arrangement with reduced Fresnel-reflection losses includes a light pipe with a solid core comprising a polymer. An optically clear substrate has first and second sides with an anti-reflective coating on at least one side. The substrate is adhered to an end-face of the core of the light pipe by adhesive material so as to create an optically clear interface between the substrate and the end-face that passes more than about 96 percent of transmitted light. A preferred method of applying an anti-reflective coating to an end-face of a core of a solid, polymeric light pipe comprises diverting uncrosslinked polymer used for forming a light pipe core, and using the diverted polymer as adhesive material between a substrate with at least one antireflective coating and the end-face of a light pipe having the same polymeric components, in the same proportions, as the diverted polymer.

US Patent:

7194184, Mar 20, 2007

Filed:

Mar 10, 2004

Appl. No.:

10/797761

Inventors:

Chris H. Jenson - Twinsburg OH, US
John M. Davenport - Middleburg Heights OH, US

Assignee:

Fiberstars Incorporated - Solon OH

International Classification:

G02B 6/00

US Classification:

385142, 385123, 385144, 385901, 362582

Abstract:

A light pipe with uniform side-light emission has a core comprising a polymer, and a fluoropolymer cladding on the core with a lower refractive index than the core. Light-scattering material is distributed within the core along an active section of light pipe in which side-light emission is desired, with a density gradient chosen to achieve uniform side-light emission. Another light pipe with uniform side-light emission has a core comprising a polymer, and a fluoropolymer cladding on the core with a lower refractive index than the core. Light-scattering material is distributed within at least one of the cladding and the core along an active section of light pipe in which side-light emission is desired, with a density gradient chosen to yield uniform side light emission, and substantially only in a radial swath, along the longitudinal axis of the light pipe, of substantially less than 360 degrees.

US Patent:

7330632, Feb 12, 2008

Filed:

Aug 23, 2006

Appl. No.:

11/466645

Inventors:

William J. Cassarly - Wooster OH, US
Thomas L. R. Davenport - Tucson AZ, US
John M. Davenport - Middleburg Heights OH, US
Chris H. Jenson - Twinsburg OH, US

Assignee:

Energy Focus, Inc. - Solon OH
Optical Research Associates - Pasadena CA

International Classification:

G02B 6/00
F21S 8/06

US Classification:

385146, 385141, 362 92, 362551, 362576

Abstract:

Fiberoptic luminaire with scattering and specular side-light extractor patterns comprises a fiberoptic light pipe with elongated side-fight emitting portion. Such portion illuminates a target area with a scattering, and a specular, light extractor pattern. The extractor patterns are arranged to extract light from the side-light emitting portion over a radial angle, orthogonal to said main axis, of less than 180. The scattering extractor pattern atone may provide greater than 50% of light on the target area, and light extracted by the specular extractor pattern alone may produce an illuminance on a selected portion of the target area that is greater than 5% of the maximum illuminance produced on the target area by the scattering extractor pattern. Furthermore, the scattering extractor pattern may comprise a Lambertian type of extractor pattern. Each specular extractor pattern may comprise a notch having main faces parallel to within 10 of each other.

US Patent:

7374313, May 20, 2008

Filed:

Mar 2, 2006

Appl. No.:

11/366711

Inventors:

William J. Cassarly - Wooster OH, US
Thomas L. R. Davenport - Tucson AZ, US
John M. Davenport - Middleburg Heights OH, US
Chris H. Jenson - Twinsburg OH, US

Assignee:

Energy Focus, Inc. - Solon OH
Optical Research Associates - Pasadena CA

International Classification:

F21V 8/00
F25D 27/00

US Classification:

362257, 362 92, 362560, 362624, 362626

Abstract:

A luminaire with improved lateral illuminance control comprising a light pipe with a longitudinal center is disclosed. A light-extraction means applied to a radial swath of the light pipe has a longitudinal portion having dimension along its length, centered about a slice on the light pipe longitudinally; said slice being orthogonal to the longitudinal center and located in a propagation plane through which light propagates to a virtual target area intersecting the propagation plane. The light pipe intervenes between the radial swath and the target area. A first average efficiency point of the light-extraction means corresponds to the minimum distance to the target area being at least approximately 20% less than a respective, second average efficiency point corresponding to a respective maximum distance to such area. The light-extraction means efficiency varies from the first average efficiency point to the second average efficiency point though more than one non-zero value.

US Patent:

7549783, Jun 23, 2009

Filed:

Apr 5, 2006

Appl. No.:

11/278797

Inventors:

William J. Cassarly - Mason OH, US
Thomas L. R. Davenport - Tucson AZ, US
John M. Davenport - Middleburg Heights OH, US
Chris H. Jenson - Twinsburg OH, US

Assignee:

Energy Focus, Inc. - Solon OH
Optical Research Associates - Pasadena CA

International Classification:

F21V 8/00

US Classification:

362559, 362555, 362 92, 362560

Abstract:

Luminaire with directional side-light extraction comprises a light pipe with a light-carrying core, and with a light-extraction structure along a first longitudinal side of the luminaire, confined to a radial swath of the luminaire, along the longitudinal axis of the luminaire, of substantially less than 180. The second end of the light pipe has light-saving means for directing saved light from the second end towards the first end. The light-extraction means is adjustable to accommodate angular distributions of light from various light sources.

US Patent:

7588342, Sep 15, 2009

Filed:

Apr 24, 2006

Appl. No.:

11/379997

Inventors:

John M. Davenport - Middleburg Heights OH, US
William J. Cassarly - Wooster OH, US
Thomas L. R. Davenport - Tucson AZ, US
Gregory P. Frankiewicz - Mayfield Heights OH, US
Chris H. Jenson - Twinsburg OH, US
Robert H. Caywood - Vermillon OH, US

Assignee:

Energy Focus, Inc. - Solon OH
Optical Research Associates - Pasadena CA

International Classification:

A47F 11/10

US Classification:

362125, 362126, 362154, 362133

Abstract:

Lighted refrigerated display case with remote light source comprises a closed container with an interior of the container refrigerated to a temperature below 7 C. The container is thermally insulated from ambient, having internal and external walls. A solid fiber optic luminaire is at least partially mounted within the container, having an elongated side-light emitting portion for emitting light from the side of the luminaire onto contents in an interior of the display case. The side-light emitting portion comprises an extractor of light arranged to preferentially extract light from the luminaire and direct the light in at least one radial direction along the length of the side-light emitting portion to at least one target area of said contents along a longitudinal axis of the side-light emitting portion. A light-delivery system provides light to the fiber optic luminaire, having a light source mounted remotely from the interior of the container.

US Patent:

8348488, Jan 8, 2013

Filed:

Aug 31, 2007

Appl. No.:

11/848493

Inventors:

John M. Davenport - Middleburg Heights OH, US
William J. Cassarly - Wooster OH, US
Thomas L. R. Davenport - Tucson AZ, US
Gregory P. Frankiewicz - Mayfield Heights OH, US
Chris H. Jenson - Twinsburg OH, US
Robert H. Caywood - Vermilion OH, US

Assignee:

Energy Focus, Inc. - Solon OH

International Classification:

F21V 7/04

US Classification:

362555, 362551

Abstract:

Lighted refrigerated display case with remote light source comprises a closed container with an interior of the container refrigerated to a temperature below 7 C. The container is thermally insulated from ambient, having internal and external walls. A solid fiber optic luminaire is at least partially mounted within the container, having an elongated side-light emitting portion for emitting light from the side of the luminaire onto contents in an interior of the display case. The side-light emitting portion comprises an extractor of light arranged to preferentially extract light from the luminaire and direct the light in at least one radial direction along the length of the side-light emitting portion to at least one target area of said contents along a longitudinal axis of the side-light emitting portion. A light-delivery system provides light to the fiber optic luminaire, having a light source mounted remotely from the interior of the container.