Patent US3598913A successfully refreshed from Google Patents.
US3598913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television receiver
Assignee: US Philips Corp
•
Filing: 1968-12-18
•
Granted: 1971-08-10
•
Expires: 1988-12-18
Abstract
Abstract This invention relates to a control circuit for a television receiver which features a gated circuit which passes the flyback signal a different selected amount than the video intensity signal. Therefore, the ratio of the flyback signal to that of intensity signal is controllable. The flyback signal is used to control the beam current intensity by use of a rectifier circuit.
Inventors
- 👤 Peter Johannes Hubertu Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:04
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/18; H04N5/185; H04N5/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A circuit for controlling a display tube by a television signal having brightness, synchronization, and nonzero reference signal components, said circuit comprising a time dependent transmission circuit having a signal input means coupled to receive said television signal and an output means for supplying an output television signal; means for coupling the output reference signal to control the output of the display tube; and means for controlling the ratio of the reference signal component to the brightness signal component of the output television signal including time dependent means for controlling the transmission of said transmission circuit; thereby to supply to said display tube reference signal components of different relative values.
Claim 2
Dependent Claim
110 words
A circuit for controlling a display tube by a television signal having brightness, synchronization, and nonzero reference signal components, said circuit comprising a time dependent transmission circuit having a signal input means coupled to receive said television signal and an output means for supplying an output television signal; means for coupling the output reference signal to control the output of the display tube; and means for controlling the ratio of the reference signal component to the brightness signal component of the output television signal including time dependent means for controlling the transmission of said transmission circuit; thereby to supply to said display tube reference signal components of different relative values.
Claim 3
Dependent Claim
30 words
A circuit as claimed in claim 1 wherein said transmission circuit comprises an active element and said transmission controlling means comprises means for varying the amplification of said active element.
Claim 4
Dependent Claim
29 words
A circuit as claimed in claim 2 wherein said active element comprises an intermediate frequency amplifier and said transmission circuit controlling means comprises a source of amplitude adjustable pulses.
Claim 5
Dependent Claim
30 words
A circuit as claimed in claim 1 wherein said coupling means comprises means for keeping constant the beam current of said display tube in accordance with said output reference signal.
References Cited (Backward Citations)
US2832822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |