Charles E Wolfe

US Patent:

6700713, Mar 2, 2004

Filed:

Aug 1, 2002

Appl. No.:

10/211785

Inventors:

Charles Robert Wolfe - Palo Alto CA

Assignee:

Jenmar Visual Systems - Fremont CA

International Classification:

G02B 308

US Classification:

359742, 359457

Abstract:

Method and apparatus for collimating light of projected images establishes limited few designs of Fresnel lenses to accommodate conventional projection systems having a wide range of sizes of viewing screens for the ted images. A multi-layer image-enhancing filter is disposed to receive Substantially collimated image light exiting the Fresnel lens.

US Patent:

6807020, Oct 19, 2004

Filed:

Nov 8, 2002

Appl. No.:

10/291079

Inventors:

Charles Robert Wolfe - Palo Alto CA

Assignee:

Jenmar Visual Systems - Fremont CA

International Classification:

G02B 308

US Classification:

359742, 359457, 359625

Abstract:

Method and apparatus for collimating light of projected images establishes limited few designs of Fresnel lenses to accommodate conventional image projection system having a wide range of sizes of viewing screens for the projected images. A multi-layer image-enhancing filter is disposed to receive substantially collimated image light exiting the Fresnel lens. A light-transmissive structure includes a substrate layer supporting a single layer of contiguously-arranged beads of light transmissive material disposed on an incident surface of the substrate layer. A Fresnel lens includes angularly-pitched segments on one surface and an array of a plurality of elongated lenses aligned in one direction on an opposite surface of the Fresnel lens for passing a projected light image therethough to the layer of beads on the substrate layer.

US Patent:

6867928, Mar 15, 2005

Filed:

Feb 7, 2003

Appl. No.:

10/360470

Inventors:

Charles Robert Wolfe - Palo Alto CA, US

Assignee:

Jenmar Visual Systems - Fremont CA

International Classification:

G02B013/20
G03B021/60

US Classification:

359707, 359453, 359452

Abstract:

High spatial frequency optical noise in the form of intensity contrasting picture elements in the display of a projected light image on a bead-oriented image-enhancing filter is significantly reduced by interposing light-scattering material in the optical path between a source of the projected light image and the display in order to inhibit formation and interference of coherent light waves, and to mask the appearance of separate or discrete beaded apertures.

US Patent:

7354164, Apr 8, 2008

Filed:

Apr 18, 2005

Appl. No.:

11/109214

Inventors:

Charles R. Wolfe - Palo Alto CA, US

Assignee:

Jenmar Visual Systems, Inc. - Fremont CA

International Classification:

G02B 27/00

US Classification:

359613, 359614, 359454

Abstract:

An optical filter includes an array of light-transmissive beads in a matrix of opaque binder that surrounds one portion of the beads to provide light entrances and exit apertures for incident light to pass substantially only through the beads. A polarizing layer is disposed between the apertures and the viewing surface of the filter for improved rejection of ambient light. The polarizing layer transmits linearly polarized image light aligned with the polarization axis while attenuating randomly or orthogonally polarized ambient light, resulting in improved image contrast.