Johann A Safar

US Patent:

43062512, Dec 15, 1981

Filed:

May 23, 1980

Appl. No.:

6/152971

Inventors:

Johann Safar - Woodcliff Lake NJ

Assignee:

North American Philips Corporation - New York NY

International Classification:

H04N 534

US Classification:

358219

Abstract:

A dynamic beam current control circuit for a television camera tube features a threshold circuit so that the correction is effected only for large light intensities impinging on the television camera tube. It also features a non-linear circuit which has a characteristic which is in the inverse of the control electrode voltage versus beam current characteristic of the camera tube. This prevents a ghost effect from showing in the display picture.