Christopher Te Rich

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:

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:

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:

52765377, Jan 4, 1994

Filed:

Jan 30, 1992

Appl. No.:

7/828363

Inventors:

Gajendra D. Savant - Torrance CA
Christopher C. Rich - San Pedro CA
David G. Pelka - Los Angeles CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G03H 102
G03H 104
B32B 900
B32B 3100

US Classification:

359 3

Abstract:

A diamondlike carbon thin film protected hologram comprises an organic film deposited on a substrate and recorded to form a hologram, and a diamondlike carbon thin film deposited on the hologram, or first and second substrates having a diamondlike carbon thin film deposited thereon and an organic film having a holographic pattern recorded therein and sandwiched between the diamondlike carbon thin films of the first and second substrates. A method of fabricating a diamondlike carbon thin film protected hologram comprises forming a layer of dichromated gelatin on a substrate, recording the dichromated gelatin to form a hologram, and depositing on the hologram a diamondlike carbon thin film at room temperature, or depositing a diamondlike carbon thin film on first and second substrates, forming a layer of dichromated gelatin on the thin film of one of the substrates, recording the layer to form a hologram, and adhering the thin film of the second substrate to the hologram. The diamondlike carbon thin film protected hologram of the present invention is impervious to moisture and humidity and other environmental conditions which would otherwise negatively affect the performance of the hologram.

US Patent:

50832190, Jan 21, 1992

Filed:

Dec 26, 1989

Appl. No.:

7/456175

Inventors:

Tomasz P. Jannson - Torrance CA
Joanna L. Jannson - Torrance CA
Christopher C. Rich - San Pedro CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G03H 104

US Classification:

359 1

Abstract:

An apparatus for recording Lippman holographic mirrors comprises an exposing volume optically coupled on one side with an index-matching fluid to the holographic material to be recorded. The volume is exposed on an adjacent side to a light beam expanded in one direction into a plane of light whose projection on the volume is a line. The line of light and the holographic material are moved relative to each other on an interrupted or a continuous basis to expose the holographic material.

US Patent:

52932729, Mar 8, 1994

Filed:

Aug 24, 1992

Appl. No.:

7/934793

Inventors:

Tomasz P. Jannson - Torrance CA
Tin M. Aye - Torrance CA
Jay W. Hirsh - Los Angeles CA
Christopher C. Rich - San Pedro CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G03H 100
G01B 9021

US Classification:

359 1

Abstract:

A high finesse holographic Fabry-Perot etalon and method of making a high finesse holographic Fabry-Perot etalon is disclosed. Particularly, a holographic Fabry-Perot etalon which achieves high finesse despite non-flat interfaces between the etalon media is presented. In a preferred method of fabricating a high finesse Fabry-Perot etalon, single step recording of both holograms simultaneously, with the spacer and substrates in place, is employed which preserves full phase synchronization between the holograms. In spite of imperfections or irregularities of the interface surfaces of the substrates or spacers, the holographic fringes in the holograms remain flat even for slightly different refractive indices between the various media. The position and flatness of the fringes remains similar to perfect Fabry-Perot etalon structure.

US Patent:

50261312, Jun 25, 1991

Filed:

Nov 13, 1989

Appl. No.:

7/435608

Inventors:

Tomasz P. Jannson - Torrance CA
Joanna L. Jannson - Torrance CA
Christopher C. Rich - San Pedro CA
Behzad Moslehi - Redondo Beach CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G02B 518

US Classification:

350 37

Abstract:

A wavelength division multiplexer/demultiplexer having optical path lengths between a fiber array and a Fourier transform lens, and between a dispersion grating and the lens equal to the focal length of the lens. The equal optical path lengths reduce losses due to angular acceptance mismatch in the multiplexer. Close orientation of the fiber array about the optical axis and the use of a holographic dispersion grating reduces other losses in the system. Multi-exposure holographic dispersion gratings enable the multiplexer/demultiplexer for extremely broad-band simultaneous transmission and reflection operation. Individual Bragg plane sets recorded in the grating are dedicated to and operate efficiently on discrete wavelength ranges. A volume Bragg vertically non-uniform holographic grating enables operation of the multiplexer or other devices that act on light waves according to wavelength over nearly the full usable 0. 8-1. 3. mu. m wavelength range.