The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 1983
Filed:
Sep. 28, 1981
Marinus C van Buul, Breda, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A television camera comprises a control circuit for controlling the electron beam current intensity in at least one pick-up tube. To prevent oscillations in a positive feedback control loop, a picture signal amplifier in the control loop is provided with a multi-step signal limiter. To this end, for a two-step signal limitation, a diode and a Zener diode have been provided, the junction of which is connected to the base of a biased signal amplifier transistor via a resistor, a second resistor being arranged between the other terminals of the diode and the Zener diode. The junction of the first diode and the second resistor is connected via at least a second diode to the collector of the signal amplifier transistor and the base of an emitter follower transistor connected thereto. The junction of the first Zener diode and the second resistor is connected via a second Zener diode to a voltage terminal.