Mark R Freeman

US Patent:

7167315, Jan 23, 2007

Filed:

Apr 20, 2004

Appl. No.:

10/828876

Inventors:

Mathew D. Watson - Bellevue WA, US
Mark Freeman - Snohomish WA, US

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G02B 27/10

US Classification:

359634, 359618

Abstract:

A beam combiner includes a first beam-input face, a beam-output face, and first and second reflectors. The first beam-input face receives first and second beams of electromagnetic energy respectively having a first and second wavelengths. The first reflector reflects the first received beam toward the beam-output face, and the second reflector passes the first beam from the first reflector and reflects the received second beam toward the beam-output face. In one alternative, the first beam-input face also receives a third beam of electromagnetic energy having a third wavelength, the beam combiner includes a third reflector that reflects the received third beam toward the beam-output face, and the first and second reflectors pass the third beam from the third reflector. In another alternative, the beam combiner includes a second beam-input face that receives a third beam directed toward the beam-output face, and the first and second reflectors pass the third beam.

US Patent:

7580007, Aug 25, 2009

Filed:

May 19, 2003

Appl. No.:

10/441916

Inventors:

Margaret Brown - Seattle WA, US
Mark Freeman - Snohomish WA, US
John R. Lewis - Bellevue WA, US
Jim Bovee - Seattle WA, US
Randy Sprague - Carnation WA, US

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G09G 1/08

US Classification:

345 15

Abstract:

A scan assembly of an image generator sweeps an image beam in a first dimension at a first rate and bi-directionally in a second dimension at a slower rate. Sweeping the beam bi-directionally in the vertical dimension (generally the dimension of the lower sweep rate) can reduce the scanning power by eliminating the flyback period, and, where the scan assembly includes a mechanical reflector, can reduce the error in the beam position without a feedback loop by reducing the number of harmonics in the vertical sweep function. Furthermore, because the image beam is “on” longer due to the elimination of the flyback period, the scanned image is often brighter for a given beam intensity. The scan assembly may also sweep the image beam non-linearly in the vertical dimension, and this sweep may be bi-directional or uni-directional. Sweeping the beam non-linearly can also reduce the error in the beam position by reducing the number of harmonics in the vertical sweep function.

US Patent:

7901084, Mar 8, 2011

Filed:

Nov 2, 2006

Appl. No.:

11/592757

Inventors:

Stephen R. Willey - Bellevue WA, US
Randall B. Sprague - Carnation WA, US
Thomas W. Montague - Mercer Island WA, US
Christopher A. Wiklof - Everett WA, US
Maarten Niesten - Kirkland WA, US
Mark Freeman - Snohomish WA, US
Bruce Rothaar - Woodinville WA, US
V. G. Veeraraghavan - Redmond WA, US
John R. Lewis - Bellevue WA, US

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G03B 21/14
G03B 21/26
G03B 21/00

US Classification:

353 49, 353 82, 353122

Abstract:

A portable video projector includes facility to direct a projected image field along an axis in an alignment corresponding to the state of an optical element.

US Patent:

8068115, Nov 29, 2011

Filed:

Jul 27, 2007

Appl. No.:

11/829484

Inventors:

Margaret K. Brown - Seattle WA, US
Mark O. Freeman - Snohomish WA, US
Mark Champion - Kenmore WA, US
Aarti Raghavan - Redmond WA, US
Shawn M. Swilley - Kent WA, US
Kelly D. Linden - Lynnwood WA, US

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G09G 5/36
G09G 5/00

US Classification:

345560, 345647, 345649

Abstract:

An image generation apparatus provides interpolation and distortion correction. The interpolation and distortion correction may be provided in one or two dimensions. Nonlinear image scan trajectories, such as sinusoidal and bi-sinusoidal trajectories are accommodated. Horizontal and vertical scan positions are determined using a linear pixel clock, and displayed pixel intensities are determined using interpolation techniques.

US Patent:

8152307, Apr 10, 2012

Filed:

Dec 21, 2009

Appl. No.:

12/643914

Inventors:

Markus Duelli - Seattle WA, US
Alban N. Lescure - Redmond WA, US
Mark O. Freeman - Snohomish WA, US
Christian Dean DeJong - Sammamish WA, US
Joshua M. Hudman - Sammamish WA, US

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G03B 21/14
G03H 1/12
H01S 5/00
H01S 3/08
H01S 3/13

US Classification:

353 38, 353 97, 359 11, 359 27, 372 29014, 372 3802, 372 5011, 372 5012, 372103

Abstract:

A optical apparatus () for use in an laser imaging system () is provided. The optical apparatus () includes one or more optical elements () that are configured to create an intermediate image plane () in the laser imaging system (). A diffractive optical element () is then disposed at the intermediate image plane () to reduce speckle. The diffractive optical element () includes a periodically repeating phase mask () that can be configured in accordance with steps, vortex functions, Hermite-Gaussian functions, and so forth. Smooth grey-level phase transitional surface () can be placed between elements () to improve brightness and image quality. The periodically repeating phase mask () makes manufacture simple by reducing alignment sensitivity, and can be used to make applicable safety standards easier to meet as well.

US Patent:

8223161, Jul 17, 2012

Filed:

Aug 22, 2007

Appl. No.:

11/843577

Inventors:

Margaret K. Brown - Seattle WA, US
Mark O. Freeman - Snohomish WA, US
Mark Champion - Kenmore WA, US
Shawn M. Swilley - Kent WA, US
Maciej A. Jakuc - Everett WA, US

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G09G 5/36

US Classification:

345560, 345536, 345537, 345545, 345600, 345606, 345647, 345672, 345686, 348744, 348746, 348807

Abstract:

An image generation apparatus provides correction for color offsets. Color offsets may be caused by misalignments in laser diodes or optics assemblies in a laser projector. The offsets may be measured during or after manufacture of the laser projector. An image buffer is responsive to the offset data to translate each color plane separately. The image buffer may include separately addressable portions for each color. Further, variable delay elements on the output of the image buffer may provide color offset correction. Interpolation provides further offset correction.

US Patent:

8274522, Sep 25, 2012

Filed:

Dec 1, 2010

Appl. No.:

12/957577

Inventors:

Margaret K. Brown - Seattle WA, US
Mark O. Freeman - Snohomish WA, US
Mark Champion - Kenmore WA, US
Kelly D. Linden - Lynnwood WA, US
Aarti Raghavan - Redmond WA, US
Shawn M. Swilley - Kent WA, US

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G09G 5/36
G09G 5/00

US Classification:

345560, 345606, 345647

Abstract:

An image generation apparatus provides interpolation and distortion correction. The interpolation and distortion correction may be provided in one or two dimensions. Nonlinear image scan trajectories, such as sinusoidal and bi-sinusoidal trajectories are accommodated. Horizontal and vertical scan positions are determined using a linear pixel clock, and displayed pixel intensities are determined using interpolation techniques.

US Patent:

8567957, Oct 29, 2013

Filed:

Jul 11, 2011

Appl. No.:

13/179828

Inventors:

Markus Duelli - Seattle WA, US
Mark O. Freeman - Snohomish WA, US
Christian Dean DeJong - Sammamish WA, US
Alban N. Lescure - Les Mureaux, FR

Assignee:

Microvision, Inc. - Redmond WA

International Classification:

G03B 21/14
G02F 1/1335
H04N 3/02

US Classification:

353 20, 348195, 349 5

Abstract:

A laser-based imaging system () is configured to reduce perceived speckle in images (). The imaging system () includes one or more laser sources (), a light modulator () configured to produce the images () with light () from the laser sources (), and one or more active polarization switches () disposed in an optical path of the imaging system (). The active polarization switch () is configured to alternate a polarization orientation of the light in synchrony with an image refresh cycle of the system. The active polarization switch can be clocked in accordance with a clocking angle to optimize speckle reduction. Additionally, one or more light preconditioners () may be used to help optimize speckle reduction.