JPH03101089U - - Google Patents
Info
- Publication number
- JPH03101089U JPH03101089U JP887290U JP887290U JPH03101089U JP H03101089 U JPH03101089 U JP H03101089U JP 887290 U JP887290 U JP 887290U JP 887290 U JP887290 U JP 887290U JP H03101089 U JPH03101089 U JP H03101089U
- Authority
- JP
- Japan
- Prior art keywords
- focus
- magnetic field
- detection element
- electromagnetic
- magnetic detection
- 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
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Description
第1図は、この考案の電磁フオーカス装置の一
実施例を示す回路構成図、第2図は、従来の電磁
フオーカス装置の一例を示す回路構成図である。
2……CRT受像管、3……フオーカスマグネ
ツト組み立て体、4……スタテイツクフオーカス
回路、6,7……永久磁石、9……スタテイツク
フオーカスコイル、21……電磁フオーカス装置
、22……磁気抵抗素子、23……直流磁界監視
回路。
FIG. 1 is a circuit diagram showing an embodiment of the electromagnetic focus device of this invention, and FIG. 2 is a circuit diagram showing an example of a conventional electromagnetic focus device. 2... CRT picture tube, 3... Focus magnet assembly, 4... Static focus circuit, 6, 7... Permanent magnet, 9... Static focus coil, 21... Electromagnetic focus device, 22 ... Magnetoresistive element, 23 ... DC magnetic field monitoring circuit.
Claims (1)
CRT受像管の管外に電磁フオーカス用として装
着されるフオーカスマグネツト組み立て体と、こ
のフオーカスマグネツト組み立て体に組み付けら
れ、直流磁界を検出する磁気検出素子と、この磁
気検出素子が検出する直流磁界があらかじめ設定
された基準となる直流磁界に一致するよう、前記
フオーカスコイルの電流値を可変制御する直流磁
界監視回路とを具備することを特徴とする電磁フ
オーカス装置。 (2) 前記磁気検出素子は、磁気抵抗素子である
ことを特徴とする請求項1記載の電磁フオーカス
装置。 (3) 前記磁気検出素子は、ホール素子であるこ
とを特徴とする請求項1記載の電磁フオーカス装
置。[Scope of utility model registration claims] (1) A permanent magnet and a focus coil are combined,
A focus magnet assembly mounted outside the CRT picture tube for electromagnetic focus, a magnetic detection element assembled to the focus magnet assembly to detect a DC magnetic field, and a DC magnetic field detected by the magnetic detection element. 1. An electromagnetic focus device comprising: a DC magnetic field monitoring circuit that variably controls the current value of the focus coil so that the current value matches a preset reference DC magnetic field. (2) The electromagnetic focus device according to claim 1, wherein the magnetic detection element is a magnetoresistive element. (3) The electromagnetic focus device according to claim 1, wherein the magnetic detection element is a Hall element.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP887290U JPH03101089U (en) | 1990-01-31 | 1990-01-31 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP887290U JPH03101089U (en) | 1990-01-31 | 1990-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03101089U true JPH03101089U (en) | 1991-10-22 |
Family
ID=31512487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP887290U Pending JPH03101089U (en) | 1990-01-31 | 1990-01-31 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03101089U (en) |
-
1990
- 1990-01-31 JP JP887290U patent/JPH03101089U/ja active Pending
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