JPH02128214U - - Google Patents
Info
- Publication number
- JPH02128214U JPH02128214U JP3625889U JP3625889U JPH02128214U JP H02128214 U JPH02128214 U JP H02128214U JP 3625889 U JP3625889 U JP 3625889U JP 3625889 U JP3625889 U JP 3625889U JP H02128214 U JPH02128214 U JP H02128214U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- low
- frequency oscillation
- player
- tracking servo
- 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.)
- Granted
Links
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Description
第１図はこの考案に係るＣＤプレーヤの低域発
振防止回路の実施例を示すブロツク図、第２図ａ
及びｂはトラツキング補正信号の特性図、第２図
ｃは低域発振時のバンドパスフイルタの入力及び
出力波形図である。第３図は従来例のブロツク図
である。
主な符号の説明、１……光ピツクアツプ、２…
…ＲＦアンプ、３，５……サーボプロセツサ、４
，１０……低域遅れ補償回路、６……アクチユエ
ータドライバ、７……トラツキングアクチユエー
タ、８……デイスク、９……バンドパスフイルタ
。
Fig. 1 is a block diagram showing an embodiment of the low-frequency oscillation prevention circuit for a CD player according to this invention, and Fig. 2a
and b are characteristic diagrams of the tracking correction signal, and FIG. 2c is a diagram of input and output waveforms of the bandpass filter during low-frequency oscillation. FIG. 3 is a block diagram of a conventional example. Explanation of main symbols, 1... Optical pickup, 2...
...RF amplifier, 3, 5...Servo processor, 4
, 10... Low frequency delay compensation circuit, 6... Actuator driver, 7... Tracking actuator, 8... Disk, 9... Band pass filter.
Claims (1)
るトラツキングサーボループ回路において、 トラツキングサーボループ回路内に低域遅れ補
償回路をＯＮ／ＯＦＦする切替え回路と、この切
替え回路の動作を低域発振が起きたときに行うた
めの検出回路とを設けたことを特徴とするＣＤプ
レーヤの低域発振防止回路。[Scope of Claim for Utility Model Registration] In a tracking servo loop circuit that drives and controls the optical pickup of a CD player, a switching circuit for turning on/off a low-frequency delay compensation circuit in the tracking servo loop circuit, and the operation of this switching circuit. A low-frequency oscillation prevention circuit for a CD player, comprising a detection circuit for detecting low-frequency oscillation when low-frequency oscillation occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989036258U JPH0725855Y2 (en) | 1989-03-31 | 1989-03-31 | Optical disc player low-frequency oscillation prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989036258U JPH0725855Y2 (en) | 1989-03-31 | 1989-03-31 | Optical disc player low-frequency oscillation prevention circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02128214U true JPH02128214U (en) | 1990-10-23 |
| JPH0725855Y2 JPH0725855Y2 (en) | 1995-06-07 |
Family
ID=31542333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989036258U Expired - Lifetime JPH0725855Y2 (en) | 1989-03-31 | 1989-03-31 | Optical disc player low-frequency oscillation prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0725855Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5139011A (en) * | 1974-09-27 | 1976-04-01 | Nippon Electric Co | JIKI HETSUDOICHIGIMESOCHI |
| JPS5979475A (en) * | 1982-10-29 | 1984-05-08 | Toshiba Corp | Protecting device of magnetic head for magnetic disk device |
-
1989
- 1989-03-31 JP JP1989036258U patent/JPH0725855Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5139011A (en) * | 1974-09-27 | 1976-04-01 | Nippon Electric Co | JIKI HETSUDOICHIGIMESOCHI |
| JPS5979475A (en) * | 1982-10-29 | 1984-05-08 | Toshiba Corp | Protecting device of magnetic head for magnetic disk device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0725855Y2 (en) | 1995-06-07 |
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