Basab B Dasgupta, 7614 Calle Ameno, San Clemente, CA 92672

6380698, Apr 30, 2002

Jan 11, 2001

09/759060

Basab Bijay Dasgupta - San Clemente CA

Sony Corporation - Tokyo
Sony Electronics, Inc. - Park Ridge NJ

G09G 128

31536825, 31536828, 313440, 313421, 335210

A deflection yoke is described for use in a cathode ray tube, which has an improved deflection sensitivity. The deflection yoke includes a ferrite core, a vertical coil to generate a vertically defecting magnetic field and a horizontal coil to generated a horizontally deflecting magnetic field. The core has a funnel-shaped body with an opening therethrough defining an inner surface. The horizontal coil includes a pair of saddle-type coils positioned in the core such that at least a portion of the horizontal coil is in contact with the inner surface of the core.

6552484, Apr 22, 2003

Jun 26, 2000

09/604050

Basab Bijay Dasgupta - San Diego CA

Sony Corporation - Tokyo
Sony Electronics Inc. - Woodcliff Lake NJ

H01J 2970

313440, 313443, 313420, 313413

Apparatus for displaying video images including a vacuum envelope which includes a neck portion and a display screen and an electron gun system. The electron gun system producing at least one electron beam, which in response to a magnetic field converges the at least one electron beam onto the display screen causing video images corresponding to the at least one electron beam to be displayed thereon. The apparatus further including a deflection yoke system for producing the magnetic field, the deflection yoke system comprising a plurality of electrical coils arranged such that a first magnetic field is formed and a second magnetic field is formed transverse to said first magnetic field, the deflection yoke system further including at least one conducting plate which includes magnetic field shaping features such that when said at least one conducting plate is electrically energized, the magnetic field is enhanced and balanced to compensate for undesired barrel distortion, pin-cushion distortion, and misconvergence errors. Alternatively, the deflection yoke system includes only a plurality of conducting plates which include magnetic field shaping features such that when the plurality of conducting plates are electrically energized, the magnetic field is produced.

6703914, Mar 9, 2004

Jan 11, 2001

09/770354

Basab Bijay Dasgupta - San Clemente CA

Sony Corporation - Tokyo
Sony Electronics Inc. - Park Ridge NJ

H01H 100

335213

A method and a related apparatus are described for forming gaps into a saddle-shaped deflection coil subsequent to a winding process. The method includes winding a conductive wire into a saddle-shaped deflection coil using a winding machine and bonding the saddle-shaped deflection coil to provide adhesive bonding between winding turns of the coil while the coil remains in the winding machine. Then, the deflection coil is removed from the winding machine and heat is applied to the deflection coil after the deflection coil has been removed from the winding machine to a temperature above a first temperature and below a second temperature. Gaps are formed in the deflection coil subsequent to the winding process while the temperature of the coil is between the first and second temperatures.

6127776, Oct 3, 2000

Jun 18, 1998

9/099438

Basab Bijay Dasgupta - Escondido CA

Sony Corporation - Toyko
Sony Electronics, Inc. - Park Ridge NJ

H01J 2970

313440

A method and apparatus for securing a deflection yoke onto a cathode ray tube includes forming pockets having deformable, resilient inner walls along a circumferential surface of the deflection yoke. When the deflection yoke is mounted on the cathode ray tube, the inner walls deform slightly to conform to a contact portion of the cathode ray tube. The position of the deflection yoke with respect to the cathode ray tube it then adjusted into proper alignment. Once the deflection yoke and cathode ray tube are properly aligned, fast curing epoxy is poured into each of the plastic pockets, wedging the deflection yoke permanently into its desired orientation on the cathode ray tube. The pockets can either be integrally formed with the deflection yoke or they can be manufactured and attached to the deflection yoke in a separate operation.

5514931, May 7, 1996

May 31, 1994

8/251478

Basab B. Dasgupta - Escondido CA
Mark A. Schmidt - Escondido CA

Sony Corporation - Tokyo
Sony Electronics, Inc. - Park Ridge NJ

H01J 2970
H01F 700
H01F 312
H01F 100

313440

An apparatus for displaying video images. A video image display apparatus including a cathode ray tube device for producing a plurality of electron beams each corresponding to a respective color and, in response to a magnetic field, for converging the electron beams onto a screen of the cathode ray tube device so as to cause video images corresponding to the converged electron beams to be displayed thereon. The apparatus further includes a deflection yoke device for producing the magnetic field. The deflection yoke device is arranged such that an inner surface thereof is adjacent to an outer surface of the cathode ray tube device. The inner surface of the deflection yoke device has a predetermined contour such that a distance between the outer surface of the cathode ray tube device and the inner surface of a middle portion of the deflection yoke device is substantially larger than each respective distance between the inner surface of both end portions of the deflection yoke device and respective adjacent parts of the outer surface of the cathode ray tube device.