Stephen S Benton, Age 807903 Stout Ave, Grosse Ile, MI 48138

6351280, Feb 26, 2002

Nov 20, 1998

09/196981

Stephen A. Benton - Lincoln MA

Massachusetts Institute of Technology - Cambridge MA

H04N 1304

348 51, 348 42, 348 57, 348 58

An autostereoscopic display system is capable of tracking one or more users within a viewing zone and presenting complementary stereoimages to each of the viewers (or viewers) eyes. Polarization is used to segregate the images that are to be directed to different spatial regions. The two images are interdigitated within a single displayâthat is, each band of image points from the first image alternates with a band of image points from the second image on the display. The bands of the first image are polarized in a first mode and the bands of the second image are polarized in a second mode orthogonal to the first, e. g. , through use of a liquid-crystal display (LCD) in which alternating, contiguous bands of pixels correspond to bands of one or the other image, and a âpatterned polarizerâ also organized into bands and aligned with the pixel bands. Autostereoscopic viewing is facilitated by a display (such as an LCD) that is illuminated by light from an outside source whose polarization can be controlled. Illumination from the light source passes through a focusing lens and then through the patterned polarizer and display so as to form a ârealâ or âaerialâ image of the display in the viewing zone, with the different images directed to different regions of the viewing zone.

6414727, Jul 2, 2002

Jul 27, 1999

09/355598

Stephen A. Benton - Lincoln MA

Corporation for Laser Optics Research - Portsmouth NH

H04N 574

348744, 359459, 359443

A laser projection video system and a holographic screen. The system includes a pulsed laser video image system with a holographic screen to receive the full color video image, which screen has a holographic layer (layer ) to reflect back the full color video image to the viewer and to transmit through the screen the ambient light to provide high video picture contrast.

4445749, May 1, 1984

Jun 6, 1980

6/157187

Stephen A. Benton - Somerville MA

Polaroid Corporation - Cambridge MA

G03H 126

350376

A method of making achromatic holographic stereograms in which projected images from a sequence of two-dimensional transparencies of a scene taken from a sequence of successively displaced positions are sequentially holographically recorded on adjacent strips of a photographic plate while the plate is inclined at an acute angle to the optical axis of projection of the images. The sequence of holographic strip images so recorded are re-recorded on a second hologram using a beam conjugate to the original reference beam to illuminate the strip hologram. The second holographic recording is done with the aid of a vertically inclined collimated reference beam of coherent light. Upon illumination of the second hologram with white light, a three-dimensional image of the original scene may be viewed by an appropriately placed observer which is achromatic over an extended angle of view and an extended apparent scene depth.

4431265, Feb 14, 1984

Dec 31, 1980

6/221846

Stephen A. Benton - Lincoln MA

Polaroid Corporation - Cambridge MA

G02B 2726
H04N 960

350132

Apparatus for viewing superposed stereographic images each presented in a different color, comprising a color television receiver having a dual dichroic polarizing filter over the viewing screen, and a pair of spectacles having orthogonally polarized lenses for viewing the screen through the filter.

5172251, Dec 15, 1992

Apr 12, 1990

7/509062

Stephen A. Benton - Lincoln MA
Joel S. Kollin - Ann Arbor MI

Massachusetts Institute of Technology - Cambridge MA

G03H 122

359 9

A three dimensional display system includes a laser for generating a laser light signal. The signal is expanded and collimated using a traditional lens system and is directed to an acousto-optic modulator wherein it is modulated to generate a three dimensional image such as a holographic image. The modulation signal for the modulator is provided by a data processing system. The data processing system applies signals to the modulator that encode a diffraction pattern. The diffraction pattern is realized by the modulator upon application of the signals and the three dimensional image is produced by the modulated light signals. The image is demagnified by a demagnifier, and subsequently, imaged by a viewing lens. A horizontal scanner continuously multiplexes segments of the holographic image and compensates for the motion of segments across the modulator. A vertical scanner is provided to properly vertically position horizontal lines of the holographic image.

4415225, Nov 15, 1983

Nov 10, 1980

6/205758

Stephen A. Benton - Lincoln MA
William R. Houde-Walter - Rochester NY
Herbert S. Mingace - Manomet MA

Polaroid Corporation - Cambridge MA

G03H 124

350 384

A process of making holographic images comprising the steps of recording a hologram of a parallax limited aerial image formed by a lens on a recording surface with a reference beam at an angle of incidence to the recording surface that is preferably equal and opposite to the angle of incidence of the object beam to the recording surface, and illuminating the hologram with a beam of diverging or collimated light, preferably at the angle of incidence of the object beam to the recording surface and directed oppositely to the direction of the object beam during recording. Illumination can be with white light. The hologram may comprise superposed recordings of the aerial image made with light of different wavelengths to produce full color holographic images.

3944322, Mar 16, 1976

Jan 16, 1975

5/541608

Stephen A. Benton - Somerville MA

Polaroid Corporation - Cambridge MA

G03H 122

350 35

A holographic arrangement is provided with light filtering means for transmitting only those light rays to the hologram which are incident to the hologram at the prescribed angles required for substantial diffraction while at the same time operating to preclude the transmission of other light rays to the hologram which would otherwise be incident to the hologram at angles outside the prescribed range of angles required for substantial diffraction by the hologram. In this manner background light which would otherwise be transmitted through a hologram so as to degrade the quality of a stereoscopic image reconstructed from the hologram is precluded from ever reaching the viewing area.

6211848, Apr 3, 2001

Feb 9, 1999

9/252591

Wendy Plesniak - Cambridge MA
Ravikanth Pappu - Cambridge MA
Stephen Benton - Lincoln MA

Massachusetts Institute of Technology - Cambridge MA

G09G 500

345 1

A user is able to interact with and modify an electronic holographic image using a force-feedback (or haptic) device, which is capable of sensing and reporting the 3D position of its hand-held stylus and "displaying" appropriate forces to the user. Thus, a user can feel and modify specified shapes in the haptic workspace. The haptic workspace is precisely registered with the free-standing, spatial image displayed by a holographic video (holovideo) system. In the coincident visuo-haptic workspace, a user can see, feel, and interact with synthetic objects that exhibit many of the properties one expects of real ones, and the spatial display enables synthetic objects to become a part of the user's manipulatory space.