Allan J Scott

US Patent:

42925673, Sep 29, 1981

Filed:

Nov 28, 1979

Appl. No.:

6/097995

Inventors:

Cliff D. Fritchle - Mountain View CA
Charles E. Hobrecht - Sunnyvale CA
Allan W. Scott - Los Altos CA

Assignee:

Varian Associates, Inc. - Palo Alto CA

International Classification:

H01J 2534

US Classification:

315 35

Abstract:

In traveling wave tubes with broad bandwidth, such as an octave or more, the gain varies by many dB across the band. One or more lossy circuits inside the tube coupled to the interaction helix-type slow-wave circuit are resonant at frequencies within the operating band. They provide a loss varying with frequency to compensate for the gain variation. The resonant circuits are typically metallized patterns on a dielectric rod which may be a support rod for the interaction circuit. Compared to an external gain equilizer in the drive circuit of the TWT, the internal equalizer is cheaper and provides a better noise figure.

US Patent:

6252934, Jun 26, 2001

Filed:

Mar 9, 1999

Appl. No.:

9/265176

Inventors:

Allan W. Scott - Los Altos CA
Gary E. Haddox - Sacramento CA
Philip M. Lally - Palo Alto CA
Yehuda Goren - Palo Alto CA

Assignee:

Teledyne Technologies Incorporated - Los Angeles CA

International Classification:

H01J 3510

US Classification:

378130

Abstract:

A cooling apparatus and method for cooling a structure using boiling fluid acted upon by centrifugal force. The cooling apparatus has an actuator with a shaft, a heat transfer member with a heat transfer surface and a fluid passageway connected to the shaft and in thermal communication with the structure. The cooling apparatus can be used to cool the anode of an x-ray tube.

US Patent:

41587910, Jun 19, 1979

Filed:

Feb 10, 1977

Appl. No.:

5/767239

Inventors:

Erling L. Lien - Los Altos CA
Allan W. Scott - Los Altos CA

Assignee:

Varian Associates, Inc. - Palo Alto CA

International Classification:

H01J 2534

US Classification:

315 35

Abstract:

To suppress spurious oscillations in a helix-type traveling wave tube (TWT), frequency-sensitive loading is produced by a lossy resonant circuit attached to a dielectric support and coupled to the fields of the interaction circuit. The lossy circuit is resonant near the band-edge frequency. It may be a section of delay line with reflective terminations. In one embodiment, it is a metallized pattern on a dielectric rod used to support the helix.

US Patent:

53733207, Dec 13, 1994

Filed:

May 18, 1993

Appl. No.:

8/063233

Inventors:

David B. Johnson - San Jose CA
Allan W. Scott - Los Altos CA
Thomas Daley - San Jose CA

Assignee:

Intevac, Inc. - Santa Clara CA

International Classification:

H04N 5238

US Classification:

348217

Abstract:

A camera attachment converts a standard day-light video camera into a day/night-vision video camera. The attachment device has a threaded input and output to physically and optically interconnect an auto-iris lens to a video camera. The attachment device contains an image intensifier tube and a fiber optic image conduit either of which may be switched into the through optical path to receive and either amplify or simply conduct the light image to a relay lens. The relay lens focuses the output image from either the image tube or the fiber optic image conduit onto the optical input of the video camera. The switching of the image intensifier tube or the fiber optic image conduit is dependent upon the ambient light conditions of the camera so that if there is insufficient lighting for normal daytime viewing the image tube is activated and switched into the through optical path of the camera.