David Robert Lamb

US Patent:

6576887, Jun 10, 2003

Filed:

Aug 15, 2001

Appl. No.:

09/930371

Inventors:

Leland R. Whitney - St. Paul MN
Gary T. Boyd - Woodbury MN
Keith M. Kotchick - St. Paul MN
Kenneth A. Epstein - St. Paul MN
Sanford Cobb, Jr. - Lakeland MN
Philip E Watson - Oakdale MN
David J. Lamb - Oakdale MN
Mark E. Gardiner - Santa Rosa CA

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G01J 104

US Classification:

25022711, 385133, 385147, 385901

Abstract:

A light guide including a light guide body having a light re-directing side positioned opposite from a light output side. A plurality of elongate prisms are located adjacent the light output side of the light guide body. The prisms extend side-by-side relative to one another along lengths. The prisms include upper edges defining heights of the prisms. The upper edges extend along the lengths of the prisms. Each upper edge includes a plurality of edge segments having different magnitudes of slope. The light guide also includes a plurality of light extraction structures located adjacent the light re-directing side of the light guide body for reflecting light toward the light output side. The light extraction structures include elongated projections each having a plateau segment and first and second facets. The elongated projections are separated by lands that are recessed relative to the plateau segments. The first and second facets extend from the plateau segments to the lands.

US Patent:

20110261584, Oct 27, 2011

Filed:

Jun 20, 2008

Appl. No.:

12/664855

Inventors:

Gary T. Boyd - Woodbury MN, US
Ji-Young Choi - Gyeonggi-Do, KR
John T. Cowher - Austin TX, US
Yasuyuki Daigo - Tokyo, JP
Kenneth A. Epstein - St. Paul MN, US
Shandon D. Hart - Corning NY, US
Charles D. Hoyle - Stillwater MN, US
Min-Young Ji - Suwon-city, KR
Chideuk kim - Gyunggi-Do, KR
Byung-Soo Ko - Seoul, KR
Keith M. Kotchick - St. Paul MN, US
Wade D. Kretman - Afton MN, US
David J. Lamb - Oakdale MN, US
Seo-Hern Lee - Kyonggi-Do, KR
Eric W. Nelson - Stillwater MN, US
Youngsoo Park - Kyonggi-Do, KR
Xianneng Peng - Shanghai, CN
Yuji Saito - Sagamihara, JP
Naoya Taniguchi - Sagamihara, JP
John F. Van Derlofske, III - Minneapolis MN, US
Leland R. Whitney - St. Paul MN, US
Kingpeng Yang - Shanghai, CN
Yang Yu - Suzhou, CN
Jie Zhou - Shanghai, CN
Rui Zhang - Shanghai, CN

International Classification:

G02F 1/1335
F21V 7/22

US Classification:

362607, 295921

Abstract:

A backlight includes a light source and one or more light recycling films. The light source generates light that exits the light source with an angular exit distribution. The light recycling films are oriented in relation to the light source so that the prism peaks of the recycling films are oriented away from the light source. The recycling films have a range of optimal incident angles that allow light to pass through the recycling films without recycling. The components of the light source, the characteristics of the recycling films, or both, are configured to control the overlap between the exit distribution of the light source and the optimal incident angle range of the recycling films.

US Patent:

20200142104, May 7, 2020

Filed:

Jul 10, 2018

Appl. No.:

16/611644

Inventors:

- St. Paul MN, US
Kristopher J. Derks - Woodbury MN, US
Tri D. Pham - Woodbury MN, US
Kenneth A. Epstein - St. Paul MN, US
David J. Lamb - Oakdale MN, US

International Classification:

G02B 5/02
F21V 8/00

Abstract:

An optical film includes a microstructured surface having a plurality of irregularly arranged planar portions forming greater than about 10% of the microstructured surface. The microstructured surface may be configured such that, when the microstructured surface is placed on an emission surface of a lightguide with a first luminous distribution of light exiting the lightguide from the emission surface in a first plane perpendicular to the emission surface, the light emitted by the lightguide is transmitted by the microstructured surface at a second luminous distribution of the transmitted light in the first plane. The first luminous distribution includes a first peak making a first angle greater than about 60 degrees with a normal to the microstructured surface. The second luminous distribution includes a second peak making a second angle in a range from about 5 degrees to about 35 degrees with the normal to the microstructured surface.

US Patent:

20200064525, Feb 27, 2020

Filed:

Jan 8, 2018

Appl. No.:

16/467221

Inventors:

- St. Paul MN, US
Tri D. Pham - Woodbury MN, US
Kenneth A. Epstein - St. Paul, MN, US
David J. Lamb - Oakdale MN, US

International Classification:

G02B 5/02

Abstract:

An optical film () includes a microstructured surface () comprising a plurality of prismatic structures (), the microstructured surface () defining a reference plane (-) and a thickness direction () perpendicular to the reference plane; wherein the plurality of prismatic structures includes a plurality of facets (), each facet having a facet normal direction forming a polar angle with respect to the thickness direction and an azimuthal angle along the reference plane, and wherein the microstructured surface has a surface azimuthal distribution of the plurality of facets that is substantially uniform, and wherein the microstructured surface has a surface polar distribution of the plurality of facets that has an off-axis peak polar distribution.