Joel A 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:

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:

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:

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.

US Patent:

20070099478, May 3, 2007

Filed:

Nov 3, 2005

Appl. No.:

11/266029

Inventors:

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

International Classification:

H01R 11/20

US Classification:

439422000

Abstract:

Certain embodiments include a method of manufacturing a polymer sheet having surface relief features. In this method, a layer of pre-polymerized material is provided. A plurality of spatially separated locations on the curable material is exposed to ultraviolet light such that the material locally cures at those locations. The curable material is exposed again such that regions outside those locations are also cured. The curing produces the polymer sheet having the surface relief features; the relief features being at those locations.

US Patent:

55343864, Jul 9, 1996

Filed:

Feb 23, 1995

Appl. No.:

8/393050

Inventors:

Joel Petersen - Valley Village CA
Jeremy Lerner - Culver City CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G03H 132
G02D 5132

US Classification:

430320

Abstract:

A homogenizer for incident light including: a sheet of embossable material including a one micro-sculpted surface relief structure that (i) controls the direction in which light propagates and (ii) homogenizes light with directionality has been formed by replicating in the sheet of embossable material another micro-sculpted surface structure that (i) controls the direction in which light propagates and (ii) homogenizes light with directionality, the another micro-sculpted surface structure having been formed in a photosensitive medium having a refractive index by: (a) generating random, disordered and non-planar speckle in the photosensitive medium using coherent light, the coherent light having been diffused through a holographic diffuser, so as to define non-discontinuous and smoothly varying changes in the refractive index of the photosensitive medium, the smoothly varying changes scattering collimated light into a controlled pattern with smooth brightness variation; and (b) developing the photosensitive medium. Light that is incident on and directed from the homogenizer is directed to an output area, the homogenizer controlling the direction of light that is emanating from the homogenizer to the output area so as to increase brightness in the output area relative to an area outside the output area.

US Patent:

59561068, Sep 21, 1999

Filed:

Feb 1, 1996

Appl. No.:

8/595307

Inventors:

Joel Petersen - Valley Village CA
Jeremy Lerner - Culver City CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G02F 11335
G02H 120
G02B 532

US Classification:

349 64

Abstract:

A light source destructuring and shaping device which both homogenizes and imparts predetermined directionality to light rays emanating from a light source is disclosed. The device comprises a micro-sculpted surface structure which controls the direction in which light propagates in either reflection or transmission. The sculpted surface structure also homogenizes light propagating through it with predetermined directionality. The device may be used in an almost unlimited number of applications which require homogenization and which would benefit from being able to impart directionality to light waves propagating from a light source. These applications include existing diffuser applications and applications wherein it was not practical to use conventional diffusers. The homogenizing and shaping device achieves these benefits with very high transmission or reflection efficiency and with reduced side lobes.

Address:

6844 Cahuenga Park Trl, Los Angeles, CA 90068

Phone:

3103013930

VIN:

3TMMU4FN8BM034087

Make:

TOYOTA

Model:

TACOMA

Year:

2011