Thomas W Spilsbury

US Patent:

44108419, Oct 18, 1983

Filed:

Sep 28, 1981

Appl. No.:

6/306452

Inventors:

Christopher R. Dusard - Phoenix AZ
Thomas W. Spilsbury - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

H01J 2958

US Classification:

315382

Abstract:

In a patterned screen color cathode ray tube (CRT) display, for example, a shadow-mask type color CRT, particularly for use under a wide range of ambient light conditions, such as an aircraft cockpit, incompatibilities between the screen pattern character, the type of writing (such as stroke and raster), and the display linewidth, may result in stroke written lines which appear as a twisted fiber rope and in raster written areas which appear wavy or watery; that is, a moire appearance. Both of these effects vary in accordance with the required display brightness over the ambient light range due to variations in beam or linewidth with corresponding variations in the required cathode drive voltages. These undesirable roping and moire effects are eliminated or substantially eliminated by varying the electron beam focus in accordance with a computed reference brightness compatible with the range of ambient brightnesses in a manner to maintain a predetermined, substantially fixed beam width for stroke written symbols and effective line spacing for raster written symbols.

US Patent:

42976219, Oct 27, 1981

Filed:

Oct 2, 1980

Appl. No.:

6/193236

Inventors:

Thomas W. Spilsbury - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

H01J 2970
H01J 2976

US Classification:

315397

Abstract:

A cathode ray dual mode electromagnetic beam deflection amplifier system for providing current for driving a deflection coil, and means for switching between linear and resonant non-linear operational modes. In the linear mode, the deflection coil current is controlled to closely follow an applied input deflection sweep voltage and operates as a push-pull amplifier. In the non-linear resonant mode, one-half the output stage is abruptly decoupled from the deflection coil such that energy stored in the deflection coil is discharged into a series capacitor, the subsequent resonant pulse being returned through the non-decoupled half of the output stage to a power supply.

US Patent:

42582989, Mar 24, 1981

Filed:

Dec 28, 1979

Appl. No.:

6/107986

Inventors:

Hugh C. Hilburn - Glendale AZ
Thomas W. Spilsbury - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

H01J 2958

US Classification:

315382

Abstract:

Apparatus is provided for effecting automatic dynamic compensation of the focal characteristics of electron beam tubes having substantially flat viewing faces, compensation in terms of two dynamic inputs including low frequency components primarily representing display brightness and high frequency components primarily representing electron beam displacement.

US Patent:

42976189, Oct 27, 1981

Filed:

Sep 15, 1980

Appl. No.:

6/187039

Inventors:

Thomas W. Spilsbury - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

H01J 2956

US Classification:

315371

Abstract:

A compensating gain control system provides improved operation of the deflection channels of cathode ray color displays, particularly a display of the penetration phosphor type. A sample of the indicator anode voltage is taken and the square root of the sample is derived. Each deflection current wave form is multiplied by the square root signal, thus providing a deflection drive current accurately scaled to anode voltage changes.

US Patent:

43027083, Nov 24, 1981

Filed:

Mar 31, 1980

Appl. No.:

6/135372

Inventors:

Thomas W. Spilsbury - Phoenix AZ

Assignee:

Sperry Corporation - New York NY

International Classification:

H01J 2970

US Classification:

315389

Abstract:

An efficient cathode ray deflection amplifier is provided having a selectable scan rate capability, providing sweep rate linearity through the use of a feed back arrangement that also cooperates in a self-adaptive manner with respect to commanding changes in the raster scan rate or display size.