JPH0394623U - - Google Patents
Info
- Publication number
- JPH0394623U JPH0394623U JP15310489U JP15310489U JPH0394623U JP H0394623 U JPH0394623 U JP H0394623U JP 15310489 U JP15310489 U JP 15310489U JP 15310489 U JP15310489 U JP 15310489U JP H0394623 U JPH0394623 U JP H0394623U
- Authority
- JP
- Japan
- Prior art keywords
- inverting buffer
- offset voltage
- circuit
- output
- integrating 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.)
- Granted
Links
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図及び第２図は本考案の一実施例を示し、
第１図はオフセツト電圧注入回路の回路図、第２
図は該回路によるオフセツト電圧の変化を示すグ
ラフであり、第３図乃至第５図は従来例を示し、
第３図は光ピツクアツプの固体差によるフオーカ
スエラー曲線の変化を示すグラフ、第４図はオフ
セツト電圧注入回路の回路図、第５図はフオーカ
スエラー曲線の振幅差によるフオーカスエラーを
説明するグラフである。
２…可変抵抗器、４…フオーカスサーボループ
、５…オフセツト電圧注入回路、６…積分回路、
１０…非反転バツフア、１１…反転バツフア。
1 and 2 show an embodiment of the present invention,
Figure 1 is the circuit diagram of the offset voltage injection circuit, Figure 2 is the circuit diagram of the offset voltage injection circuit.
The figure is a graph showing changes in offset voltage due to the circuit, and FIGS. 3 to 5 show conventional examples,
Figure 3 is a graph showing changes in focus error curves due to individual differences in optical pickups, Figure 4 is a circuit diagram of an offset voltage injection circuit, and Figure 5 explains focus errors due to amplitude differences in focus error curves. It is a graph. 2... Variable resistor, 4... Focus servo loop, 5... Offset voltage injection circuit, 6... Integrating circuit,
10...Non-inverting buffer, 11...Inverting buffer.
Claims (1)
ツフアと、前記非反転バツフアの出力を反転する
反転バツフアとからなり、前記積分回路にフオー
カス検出信号の和を入力し、前記非反転バツフア
と反転バツフアとの出力端子間電圧を可変抵抗器
を介して所定のオフセツト電圧とし、サーボルー
プに注入するフオーカスサーボ機構のオフセツト
電圧注入回路。 It consists of an integrating circuit, a non-inverting buffer connected to the integrating circuit, and an inverting buffer that inverts the output of the non-inverting buffer. An offset voltage injection circuit for a focus servo mechanism that sets the voltage between the output terminals of the output terminal to a predetermined offset voltage via a variable resistor and injects it into the servo loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15310489U JP2508615Y2 (en) | 1989-12-28 | 1989-12-28 | Offset voltage injection circuit of focus servo mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15310489U JP2508615Y2 (en) | 1989-12-28 | 1989-12-28 | Offset voltage injection circuit of focus servo mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0394623U true JPH0394623U (en) | 1991-09-26 |
| JP2508615Y2 JP2508615Y2 (en) | 1996-08-28 |
Family
ID=31699331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15310489U Expired - Fee Related JP2508615Y2 (en) | 1989-12-28 | 1989-12-28 | Offset voltage injection circuit of focus servo mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2508615Y2 (en) |
-
1989
- 1989-12-28 JP JP15310489U patent/JP2508615Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2508615Y2 (en) | 1996-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |