JPS63114413U - - Google Patents
Info
- Publication number
- JPS63114413U JPS63114413U JP12278286U JP12278286U JPS63114413U JP S63114413 U JPS63114413 U JP S63114413U JP 12278286 U JP12278286 U JP 12278286U JP 12278286 U JP12278286 U JP 12278286U JP S63114413 U JPS63114413 U JP S63114413U
- Authority
- JP
- Japan
- Prior art keywords
- focus error
- focus
- error signal
- player
- detection circuit
- 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 4
- 230000005494 condensation Effects 0.000 claims 2
- 238000009833 condensation Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Description
第１図は本考案の一実施例構成図、第２図は４
分割フオトダイオード上のビーム像を示す説明図
、第３図はフオーカスエラー検出回路の一実施例
の簡略回路図、第４図はフオーカスサーチ時のフ
オーカスエラー信号レベルを表したグラフ、であ
る。
３……フオーカスエラー検出回路、４……コン
パレータ、５……マイコン、８……フオーカスサ
ーボ回路。
Fig. 1 is a configuration diagram of one embodiment of the present invention, Fig. 2 is a 4
FIG. 3 is a simplified circuit diagram of an embodiment of a focus error detection circuit, and FIG. 4 is a graph showing the focus error signal level during focus search. be. 3... Focus error detection circuit, 4... Comparator, 5... Microcomputer, 8... Focus servo circuit.
Claims (1)
ーカスエラー信号に応じてフオーカスサーボ回路
を働かせるＣＤプレーヤーにおいて、フオーカス
サーチ時に得られる前記フオーカスエラー信号レ
ベルと所定レベルとを比較する比較手段を設け、
フオーカスエラー信号レベルが所定レベルより小
さい場合は結露と判断するようにしたことを特徴
とするＣＤプレーヤーにおける結露検出回路。 In a CD player that operates a focus servo circuit in response to a focus error signal output from a focus error detection circuit, a comparison means is provided for comparing the focus error signal level obtained during focus search with a predetermined level,
A dew condensation detection circuit for a CD player, characterized in that if a focus error signal level is lower than a predetermined level, it is determined that condensation has occurred.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12278286U JPS63114413U (en) | 1986-08-09 | 1986-08-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12278286U JPS63114413U (en) | 1986-08-09 | 1986-08-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63114413U true JPS63114413U (en) | 1988-07-23 |
Family
ID=31013300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12278286U Pending JPS63114413U (en) | 1986-08-09 | 1986-08-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63114413U (en) |
-
1986
- 1986-08-09 JP JP12278286U patent/JPS63114413U/ja active Pending