GB980210A - Improvements in or relating to circuit arrangements including cathode-ray tubes,and protective circuit arrangements therefor - Google Patents
Improvements in or relating to circuit arrangements including cathode-ray tubes,and protective circuit arrangements thereforInfo
- Publication number
- GB980210A GB980210A GB37801/62A GB3780162A GB980210A GB 980210 A GB980210 A GB 980210A GB 37801/62 A GB37801/62 A GB 37801/62A GB 3780162 A GB3780162 A GB 3780162A GB 980210 A GB980210 A GB 980210A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- tube
- parts
- circuit
- circuit arrangements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Details Of Television Scanning (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
980,210. Protective arrangements for cathoderay tubes. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Oct. 5, 1962 [Oct. 9,. 1961], No. 37801/62. Heading H1D. [Also in Division H4] To prevent burning of the screen of a cathoderay tube by the electron beam when the tube is switched off, the first anode is comprised of two mutually-insulated parts 6a, 6b connected respectively to a circuit including a capacitor 27 and voltage divider 28, 29, and to a circuit including a potentiometer 32 and resistors 30, 31, the discharge time-constant of the latter circuit being less than that of the former. Thus when the tube is switched off the voltage of part 6b decreases more rapidly than that of part 6a to cause deflection of the electron beam in the direction II, where it impinges on the part 7 of the second anode to discharge this part, the part 8 and a conductive coating 11 connected to the screen, before the deflection due to the voltage difference between parts 6a, 6b has decreased to zero. Adjustment of potentiometer 32 to make the voltage of part 6b equal to that of part 6a produces a beam direction I during tube operation, the positive voltage for the parts 6a, 6b being supplied from the horizontal deflection circuit through its efficiency diode circuit and a potentiometer, Fig. 1 (not shown). Fig. 3 shows a simplified arrangement in which upon switching off, the voltage of anode part 6d decreases more rapidly than that of part 6 c so that, since part 6d has a small aperture, the electron beam is suppressed completely (although in this case parts 7, 8, 11 are not discharged). During tube operation the voltage of parts 6c, 6d will always become equal. The circuit arrangements and tube constructions shown in Figs. 2 and 3 may be interchanged. The supply and control circuits for the tube are described, Fig. 1 (not shown), and typical values are given for their resistors and capacitors and for those shown in Figs. 2 and 3.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL270069A NL270069A (en) | 1961-10-09 | 1961-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB980210A true GB980210A (en) | 1965-01-13 |
Family
ID=19753331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37801/62A Expired GB980210A (en) | 1961-10-09 | 1962-10-05 | Improvements in or relating to circuit arrangements including cathode-ray tubes,and protective circuit arrangements therefor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3210596A (en) |
| BE (1) | BE623370A (en) |
| DE (1) | DE1279216B (en) |
| ES (1) | ES281335A1 (en) |
| GB (1) | GB980210A (en) |
| NL (1) | NL270069A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0036901A1 (en) * | 1980-04-01 | 1981-10-07 | Norddeutsche Mende Rundfunk KG | Arrangement for producing electron beams in a vacuum discharge vessel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2131203A (en) * | 1931-03-27 | 1938-09-27 | Loewe Opta Gmbh | Television method |
| US2096987A (en) * | 1932-11-15 | 1937-10-26 | Ardenne Manfred Von | System for energizing a cathode ray tube |
| US2562242A (en) * | 1950-06-06 | 1951-07-31 | Du Mont Allen B Lab Inc | Split anode for bent gun ion trap cathode-ray tubes |
-
0
- BE BE623370D patent/BE623370A/xx unknown
-
1961
- 1961-10-09 NL NL270069A patent/NL270069A/xx unknown
-
1962
- 1962-10-05 US US228546A patent/US3210596A/en not_active Expired - Lifetime
- 1962-10-05 DE DEN22178A patent/DE1279216B/en active Pending
- 1962-10-05 GB GB37801/62A patent/GB980210A/en not_active Expired
- 1962-10-06 ES ES281335A patent/ES281335A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1279216B (en) | 1968-10-03 |
| ES281335A1 (en) | 1963-03-16 |
| US3210596A (en) | 1965-10-05 |
| NL270069A (en) | 1964-07-27 |
| BE623370A (en) |
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