Francis E Campbell Deceased495 Proposed Ave, Franklinville, NJ 08322

5754014, May 19, 1998

Nov 30, 1994

8/346624

Kyung-ho Kim - Taeku, KR
Francis Joseph Campbell - Yardley PA

Orion Electric Co., Ltd. - Kyungsangbuk-Do

H01J 2952

3153821

The present invention discloses an improved electron gun for a color picture tube. The present gun having a triple electrode part, a prefocusing lens part for preliminarily focusing and accelerating the electron beam from the triple electrode part, and a main lens part for finally focusing and accelerating the beam from the prefocusing lens part, is characterized in that the prefocusing lens part comprises a plurality of focusing lenses for forminig at last one quadrapole lens, and two different focusing voltages each of which being dynamically changed synchronized with the deflection signal, are selectively applied to each focusing electrode. Thus, a uniform beam section can be obtained all over the screen.

5763991, Jun 9, 1998

Nov 30, 1994

8/346882

Hyo-jong Yoon - Taeku, KR
Francis Joseph Campbell - Yardley PA

Orion Electric Co. - Kyungsangbok-do

H01J 2950

313412

The present invention discloses an improved electron gun for a color picture tube including a main lens having a first rim electrode having a beam passing plane with holes in an incident side of the electron beam and a second rim electrode facing the first rim electrode and having a beam passing plane with holes in a departing side of the beam. A focusing electrode having a beam passing plane with holes in departing side of the beam for forming compensating astigmatism quadrupole lenses in conjunction with the first rim electrode to compensate for the astigmatism of the main lens is positioned adjacent to the first rim electrode of the main lens. Astigmatism formed between the first and second rim electrode of the main lens electrodes can be reduced by the compensating astigmatism of the quadrupole lenses.

5218152, Jun 8, 1993

Jun 12, 1991

7/714274

Francis W. Campbell - Levittown PA
William R. Sands - Newtown PA

G10D 1300

844224

In a first embodiment, a drumstick, balanced for juggling, exhibits a center of mass in the range of 58% to 62% of the distance along its length from the butt end. It is herein recognized that such a drumstick is suitable for both juggling and drumming, and supports a drumming performance which includes a juggling portion. In second and third embodiments, a drum mallet and a keyboard mallet, each of which is balanced for juggling, exhibits a center of mass in the range of 58% to 62% along the shaft from the butt end.

3932786, Jan 13, 1976

Nov 29, 1974

5/528400

Francis Joseph Campbell - Yardley PA

RCA Corporation - New York NY

H01T 2929
H01J 2982

315 3

The disclosed apparatus is a multiple beam electron gun having a wide focusing lens gap. The lens gap has a plurality of metal elements, spaced therein, each successive element of which has a successively greater voltage applied to it. The application of the voltages creates an electrostatic field which focuses a plurality of beams generated by the gun.

4228413, Oct 14, 1980

Dec 11, 1978

5/968417

Francis J. Campbell - Yardley PA
William H. Barkow - Pennsauken NJ

RCA Corporation - New York NY

H01F 500

335213

A deflection yoke for deflecting the electron beam of a kinescope includes conductors, portions of which are saddle-wound and portions of which are toroidally wound for reducing the length of conductor required for deflection, for reducing losses due to leakage fields, or both.

5635792, Jun 3, 1997

Dec 30, 1994

8/366673

Sung-youb Jung - Kyungsangbuk-do, KR
Francis J. Campbell - Yardley PA

Orion Electric Co. Ltd. - Gumi

H01J 2951
H01J 2950

313412

In a conventional construction of an electron gun with quadrupole lenses, a grid part with elongated apertures all arranged in the same direction cannot be easily secured to alignment mandrels of circular cross section. As a result, grid movement during assembly can cause a misalignment that deteriorates the tube resolution. The present invention includes arranging circular and elongated apertures in the same grid part, and also alternately arranging circular and elongated apertures in adjacent grid parts, so as to secure the grid parts to the mandrels and automatically maintain the alignment during gun assembly. The aperture combinations described herein produce electron lens astigmatism of approximately the same strength and sign for each beam of an in-line gun.