Joel M Petersen

US Patent:

6998196, Feb 14, 2006

Filed:

Dec 28, 2001

Appl. No.:

10/036198

Inventors:

Chris Rich - San Pedro CA, US
Joel Petersen - Valley Village CA, US

Assignee:

Wavefront Technology - Paramount CA

International Classification:

G03H 1/02

US Classification:

430 1, 430 2, 359 12

Abstract:

A diffractive optical element such as a diffuser, diffraction grating, and/or hologram, can be manufactured by using a surface relief pattern on a surface of a surface relief tool. A layer of curable material is physically contacted with the surface relief pattern on the surface of the surface relief tool to thereby imprint the pattern on a surface of the layer. Diffractive features are formed in the layer by propagating energy through the surface relief tool and into the layer such that refractive index variations corresponding to the pattern are created in the layer. The resultant product is a diffractive optical element comprising a layer of material having diffractive features formed by a predetermined pattern of refractive index variations. The diffractive features originate at an undulating boundary and extend only from one side of the boundary into the material. The undulating boundary has an undulating pattern that corresponds to the predetermined pattern of refractive index variations.

US Patent:

7298533, Nov 20, 2007

Filed:

Mar 22, 2004

Appl. No.:

10/805850

Inventors:

Joel M. Petersen - Valley Village CA, US
Christopher Chapman Rich - Rancho Palos Verdes CA, US

Assignee:

Wavefront Technology - Paramount CA

International Classification:

G02B 5/32
G02B 5/18
G02B 3/08

US Classification:

359 15, 359569, 359567, 359742

Abstract:

An optical layer comprises a sheet of material having a surface. The surface comprises a plurality of optical elements. The optical elements are comprised of microscopic patterns in the surface that cooperate to produce an image. Each of the elements has a focal length. At least some of the focal lengths are significantly different from other focal lengths, such that some portions of the surface appear to be closer to a viewer than other portions of the surface.

US Patent:

7343693, Mar 18, 2008

Filed:

Nov 9, 2006

Appl. No.:

11/598257

Inventors:

Donald K. Mitchell - Wayland MA, US
Donald L. Grimes - Milford MA, US
William G. Thorburn - Whitinsville MA, US
Keith M. Hinrichs - Natick MA, US
Andrew Goldman - Stow MA, US
Joel M. Petersen - Valley Village CA, US
Christopher C. Rich - Rancho Palos Verdes CA, US

Assignee:

GSI Group Corporation - Billerica MA

International Classification:

G01B 11/02

US Classification:

33707

Abstract:

A flexible optical marker is applied to an optical scale substrate to make an optical scale assembly for an optical position encoder. The marker may be a limit marker, index marker, or other type of marker. The marker substrate may be a plastic film such as polyester, singulated from a “recombine” roll created by a web process. The marker has a microstructured pattern on one surface that is covered with a reflective metal coating. The marker also has an adhesive layer and is affixed to the optical scale substrate by a process of aligning the marker to an edge of the scale and then applying pressure to the upper surface of the marker. The marker may be applied with a handle portion that is separated from the marker after the marker is affixed. The marker may be especially useful with a flexible scale substrate such as a metal tape substrate. By affixing the marker to the scale substrate as a separate step of making an encoder scale, various benefits such as reduced inventory, cost, and lead time may be achieved.

US Patent:

7429437, Sep 30, 2008

Filed:

Jan 31, 2006

Appl. No.:

11/343576

Inventors:

Chris Rich - San Pedro CA, US
Joel Petersen - Valley Village CA, US

Assignee:

Wavefront Technology, Inc. - Paramount CA

International Classification:

G03H 1/04

US Classification:

430 1, 430 2, 430 20, 359 3, 359 7

Abstract:

A diffractive optical element such as a diffuser, diffraction grating, and/or hologram, can be manufactured by using a surface relief pattern on a surface of a surface relief tool. A layer of curable material is physically contacted with the surface relief pattern on the surface of the surface relief tool to thereby imprint the pattern on a surface of the layer. Diffractive features are formed in the layer by propagating energy through the surface relief tool and into the layer such that refractive index variations corresponding to the pattern are created in the layer. The resultant product is a diffractive optical element comprising a layer of material having diffractive features formed by a predetermined pattern of refractive index variations. The diffractive features originate at an undulating boundary and extend only from one side of the boundary into the material. The undulating boundary has an undulating pattern that corresponds to the predetermined pattern of refractive index variations.

US Patent:

7430358, Sep 30, 2008

Filed:

Apr 19, 2006

Appl. No.:

11/406792

Inventors:

Jun Qi - Corona CA, US
Joel Mikael Petersen - Valley Village CA, US
Christopher Chapman Rich - Rancho Palos Verdes CA, US

Assignee:

Wavefront Technology, Inc. - Paramount CA

International Classification:

G02B 6/10
G02B 6/00

US Classification:

385146, 385147, 362 26, 362610, 349 64, 349 65

Abstract:

A backlit light display comprises a light guide panel, a prismatic film, an asymmetric top diffuser and an LCD. A linear light source is disposed along a side face of the light guide panel. Light from the linear light source is transmitted though the light guide panel where it is spread and uniformly output through a front face to the prismatic film. Light incident on the prismatic film is redirected more along a first direction than along a second direction. This light is directed more normal to the LCD. An asymmetric diffuser is applied between the prismatic film and the LCD panel to smear the periodic information from the prismatic film and eliminate the Moiré fringe pattern resulting from interference between the periodic structure of the prismatic film and the periodic arrangement of pixels in the LCD. The asymmetric diffuser is aligned with respect to the prismatic film such that it scatters and spreads light more in a second direction than the first direction.

US Patent:

8169699, May 1, 2012

Filed:

Dec 22, 2010

Appl. No.:

12/977026

Inventors:

Joel Petersen - Valley Village CA, US
Christopher Rich - Rancho Pales Verdes CA, US
Raymond Jacob Lewandowski - San Diego CA, US
Gary D. Sharp - Boulder CO, US
David Coleman - Louisville CO, US

Assignee:

RealD Inc. - Beverly Hills CA

International Classification:

G03B 21/56

US Classification:

359452, 353 20, 359443, 359454, 359458, 359459

Abstract:

Polarization preserving projection screens provide optimum polarization preservation for 3D viewing. The projection screens additionally provide improved light control for enhanced brightness, uniformity, and contrast for both 2D and 3D systems. Generally, the disclosed method for providing a projection screen comprises stripping an optically functional material from a carrier substrate, thus creating engineered particles from the optically functional material. The engineered particles may then be deposited on a second substrate to create a substantially homogeneous optical appearance of the projection screen.

US Patent:

8194315, Jun 5, 2012

Filed:

Dec 22, 2010

Appl. No.:

12/976986

Inventors:

Gary D. Sharp - Boulder CO, US
David A. Coleman - Louisville CO, US
Joel Petersen - Valley Village CA, US
Christopher Rich - Rancho Pales Verdes CA, US
Raymond Jacob Lewandowski - San Diego CA, US

Assignee:

ReaID Inc. - Beverly Hills CA
Wavefront Technology, Inc. - Paramount CA

International Classification:

G03B 21/60

US Classification:

359452, 427180, 427194, 359443, 359518, 359538

Abstract:

Polarization preserving projection screens provide optimum polarization preservation for 3D viewing. The projection screens additionally provide improved light control for enhanced brightness, uniformity, and contrast for both 2D and 3D systems. Generally, the disclosed method for providing a projection screen comprises embossing at least a first side of a first substrate to produce an optically functional material and then cutting the optically functional material into pieces to produce a plurality of engineered particles. The plurality of engineered particles may then be deposited on a second substrate to produce a substantially homogeneous optical appearance of the projection screen.

US Patent:

8488240, Jul 16, 2013

Filed:

Apr 27, 2012

Appl. No.:

13/457707

Inventors:

Joel Petersen - Valley Village CA, US
Christopher Rich - Rancho Pales Verdes CA, US
Raymond Jacob Lewandowski - San Diego CA, US
Gary D. Sharp - Boulder CO, US
David Coleman - Louisville CO, US

Assignee:

RealD Inc. - Beverly Hills CA

International Classification:

G03B 21/60

US Classification:

359452, 359443

Abstract:

Polarization preserving projection screens provide optimum polarization preservation for 3D viewing. The projection screens additionally provide improved light control for enhanced brightness, uniformity, and contrast for both 2D and 3D systems. Generally, the disclosed method for providing a projection screen comprises stripping an optically functional material from a carrier substrate, thus creating engineered particles from the optically functional material. The engineered particles may then be deposited on a second substrate to create a substantially homogeneous optical appearance of the projection screen.