JPH0361755U - - Google Patents
Info
- Publication number
- JPH0361755U JPH0361755U JP12339489U JP12339489U JPH0361755U JP H0361755 U JPH0361755 U JP H0361755U JP 12339489 U JP12339489 U JP 12339489U JP 12339489 U JP12339489 U JP 12339489U JP H0361755 U JPH0361755 U JP H0361755U
- Authority
- JP
- Japan
- Prior art keywords
- focus
- beam current
- ray tube
- voltage
- cathode ray
- 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 11
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Details Of Television Scanning (AREA)
Description
第１図は本考案の基本的構成を示すブロツク図
、第２図はビームのスポツト径が最小となるビー
ム電流ｉＢとフオーカス電圧ＶＦとの関係を示す
グラフ、第３図は本考案の一実施例を示す電気回
路図、第４図は動作状態を示す説明図、第５図お
よび第６図は各々、本考案の他の実施例を示す電
気回路図、第７図は従来例を示す電気回路図であ
る。
１……陰極線管、２……フオーカス電極、３…
…フオーカス電圧出力部、４……ビーム電流検知
部、５……フオーカス電圧制御部。
Fig. 1 is a block diagram showing the basic configuration of the present invention, Fig. 2 is a graph showing the relationship between beam current iB and focus voltage VF that minimizes the beam spot diameter, and Fig. 3 is an implementation of the present invention. 4 is an explanatory diagram showing the operating state, FIGS. 5 and 6 are electrical circuit diagrams showing other embodiments of the present invention, and FIG. 7 is an electrical circuit diagram showing a conventional example. It is a circuit diagram. 1... Cathode ray tube, 2... Focus electrode, 3...
... Focus voltage output section, 4... Beam current detection section, 5... Focus voltage control section.
補正 平２．１．２９
実用新案登録請求の範囲を次のように補正する
。Amendment: January 29, 2002 The scope of claims for utility model registration is amended as follows.
【実用新案登録請求の範囲】
陰極線管１に所定のフオーカス電圧ＶＦを出
力する手段と、
陰極線管１に流れるビーム電流ｉＢの大小に対
応した検知信号を発生するビーム電流検知手段と
、
該検知手段から出力される検知信号により、フ
オーカス電圧出力手段から出力されるフオーカス
電圧ＶＦ値を、最小のビームスポツト径を維持可
能なビーム電流ｉＢに対するフオーカス電圧ＶＦ
の特性に対応させて制御する手段とを備えたフオ
ーカス回路。
前記したビーム電流検知手段は、陰極線管１
に流れるビーム電流の大きさに対応した電圧を発
生する請求項１記載のフオーカス回路。[Scope of Claim for Utility Model Registration] Means for outputting a predetermined focus voltage VF to the cathode ray tube 1; Beam current detection means for generating a detection signal corresponding to the magnitude of the beam current iB flowing through the cathode ray tube 1; and the detection means. The focus voltage VF value output from the focus voltage output means is determined by the detection signal output from the focus voltage VF value for the beam current iB that can maintain the minimum beam spot diameter.
and means for controlling in accordance with the characteristics of the focus circuit. The beam current detection means described above is the cathode ray tube 1.
2. The focus circuit according to claim 1, wherein the focus circuit generates a voltage corresponding to the magnitude of the beam current flowing through the focus circuit.
Claims (1)
力する手段と、 陰極線管１に流れるビーム電流ｉＢの大小に対
応した検知信号を発生するビーム電流検知手段と
、 該検知手段から出力される検知信号により、フ
オーカス電圧出力手段から出力されるフオーカス
電圧ＶＦ値を、最小のビームスポツト径を維持可
能なビーム電流ｉＢに対するフオーカス電圧ＶＦ
の特性に対応させて制御する手段とを備えたフオ
ーカス回路。 前記したビーム電流検知手段は、陰極線管１
に流れる暗電流の大きさに対応した電圧を発生す
る請求項１記載のフオーカス回路。[Scope of Claim for Utility Model Registration] Means for outputting a predetermined focus voltage VF to the cathode ray tube 1; Beam current detection means for generating a detection signal corresponding to the magnitude of the beam current iB flowing through the cathode ray tube 1; and the detection means. The focus voltage VF value output from the focus voltage output means is determined by the detection signal output from the focus voltage VF value for the beam current iB that can maintain the minimum beam spot diameter.
and means for controlling in accordance with the characteristics of the focus circuit. The beam current detection means described above is the cathode ray tube 1.
2. The focus circuit according to claim 1, wherein the focus circuit generates a voltage corresponding to the magnitude of dark current flowing through the focus circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12339489U JPH0361755U (en) | 1989-10-20 | 1989-10-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12339489U JPH0361755U (en) | 1989-10-20 | 1989-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0361755U true JPH0361755U (en) | 1991-06-17 |
Family
ID=31671374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12339489U Pending JPH0361755U (en) | 1989-10-20 | 1989-10-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0361755U (en) |
-
1989
- 1989-10-20 JP JP12339489U patent/JPH0361755U/ja active Pending
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