JPS6442668U - - Google Patents
Info
- Publication number
- JPS6442668U JPS6442668U JP13692787U JP13692787U JPS6442668U JP S6442668 U JPS6442668 U JP S6442668U JP 13692787 U JP13692787 U JP 13692787U JP 13692787 U JP13692787 U JP 13692787U JP S6442668 U JPS6442668 U JP S6442668U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- beam current
- voltage
- detection circuit
- transistor
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 1
Description
第１図は本考案の一実施例におけるビーム電流
検出回路の回路図、第２図は従来のビーム電流検
出回路の回路図、第３図は第２図の要部波形図で
ある。
１……高圧巻線、２……ブラウン管、３……ア
ノード、４……カソード、５……外部導電膜、Ｑ
１……第１トランジスタ、Ｒ２……検出用抵抗、
８……時定数回路。
FIG. 1 is a circuit diagram of a beam current detection circuit according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a conventional beam current detection circuit, and FIG. 3 is a waveform diagram of the main part of FIG. 2. 1... High voltage winding, 2... Braun tube, 3... Anode, 4... Cathode, 5... External conductive film, Q
1 ...First transistor, R2 ...Detection resistor,
8...Time constant circuit.
Claims (1)
電膜と基準電位点間に抵抗を設け、この抵抗の両
端間の電圧変化によりビーム電流量を検出してな
るビーム電流検出回路において、前記抵抗に流れ
る電流が所定レベル以上となつたときに導通する
トランジスタと、このトランジスタが導通したと
きの前記抵抗に流れるピーク電流に応じた電圧を
保持する時定数回路とを設け、前記保持された電
圧により自動輝度制限回路を制御することを特徴
とするビーム電流検出回路。 In a beam current detection circuit in which a resistor is provided between an external conductive film provided on the funnel of a cathode ray tube and a reference potential point, and the amount of beam current is detected based on a voltage change across the resistor, the current flowing through the resistor is An automatic brightness limiting circuit is provided, which includes a transistor that becomes conductive when the voltage reaches a predetermined level or higher, and a time constant circuit that holds a voltage corresponding to the peak current flowing through the resistor when the transistor becomes conductive, and uses the held voltage to control the brightness. A beam current detection circuit characterized by controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13692787U JPS6442668U (en) | 1987-09-08 | 1987-09-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13692787U JPS6442668U (en) | 1987-09-08 | 1987-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6442668U true JPS6442668U (en) | 1989-03-14 |
Family
ID=31397891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13692787U Pending JPS6442668U (en) | 1987-09-08 | 1987-09-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6442668U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043981A (en) * | 1983-08-22 | 1985-03-08 | Sony Corp | Beam current limiting circuit |
-
1987
- 1987-09-08 JP JP13692787U patent/JPS6442668U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043981A (en) * | 1983-08-22 | 1985-03-08 | Sony Corp | Beam current limiting circuit |
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