CN1020010C - 循迹控制电路 - Google Patents
循迹控制电路 Download PDFInfo
- Publication number
- CN1020010C CN1020010C CN90108694A CN90108694A CN1020010C CN 1020010 C CN1020010 C CN 1020010C CN 90108694 A CN90108694 A CN 90108694A CN 90108694 A CN90108694 A CN 90108694A CN 1020010 C CN1020010 C CN 1020010C
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- input end
- multiplier
- output terminal
- control circuit
- track control
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/094—Methods and circuits for servo offset compensation
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- Optical Recording Or Reproduction (AREA)
- Valve Device For Special Equipments (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Noodles (AREA)
- Semiconductor Lasers (AREA)
- Details Of Television Scanning (AREA)
- Luminescent Compositions (AREA)
- Control Of Charge By Means Of Generators (AREA)
- Electrophonic Musical Instruments (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Vehicle Body Suspensions (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Selective Calling Equipment (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
在扫描信息介质上以某一频率扭摆的数据轨迹的光扫描装置上,扫描数据的光束被从信息介质上折射到装有4个光电二极管(A、B、C、D)的四象限光探测器(PD)上。所有光电二极管(A、B、C、D)的输出信息在加法放大器中相加。为了自动地补偿在循迹控制电路中诸如由温度变化造成的偏移电压,加法放大器的输出端连接到其另一输入端加有循迹误差信号的乘法器的一个输入端上。乘法器的输出信号通过低通滤波器送入循迹控制电路作为补偿电压。
Description
此发明涉及一种用于光扫描装置的循迹控制电路,以此,光束可由该循迹控制电路引导跟踪-唱片形信息介质上以某一中心频率扫摆的数据轨迹,并借助于聚焦控制电路将该光束会聚于该信息介质上且使该光束从该信息介质上折射到一光探测器。
根据EP-A-O256984可知唱片形信息介质,其数据轨迹是以一中心频率扭摆的。因而该数据轨迹成正弦形。这种形状特殊的数据轨迹的优点在于它们可以包含附加的信息,例如位置信息。
在所谓的推挽方法中,光束在扫描这种信息介质上的数据时可由一聚焦控制电路会聚在该信息介质上,并由一循迹控制电路引导跟踪一条以预定频率扭摆的数据轨迹。扫描数据轨迹的光束被信息介质折射到一个由4个光电二极管A、B、C和D构成的四象限光探测器。4个光电二极管A、B、C和D的输出信号在一加法放大器中相加。为了产生循迹误差信号即用于循迹控制电路的控制信号,两个相邻设置的光电二极管A和B的输出信号被送入第一差分放大器的加法输入端,而另外两个相邻设置的光电二极管C和D的输出信号被送入第一差分放大器的减法输入端。用于聚焦控制电路的控制信号即所谓的聚焦误差信号,取自第二差分放大器的输出端,而其加法输入端有第一对两个对角设置的光电二极管A和C的输出信号送入,而另一对两个对角设置的光电二极管B和D的输出信号被送入第二差分放大器的减法输入端。
为了补偿出现在光探测器和放大器中的无用的偏移电压,将预先
用电位器调整好的补偿电压送入循迹控制电路。
然而这种方法具有仍然忽视了诸如由元件老化或由于温度变化而造成的偏移电压变化的缺点。为了还能够补偿偏移电压的变化,须经常地用一电位器来调整补偿电压。
因而此发明的目的就是在所述那种循迹控制电路中自动地补偿偏移电压及其诸如由元件老化或由温度变化所致的变化。
此发明通过将光探测器的输出端与一乘法器的第一输入端相接,通过将循迹误差信号送至该乘法器的第二输入端并通过将该乘法器输出端处的信号经一低通滤波器送入循迹控制电路作为补偿电压而达到了这个目的。
图1为此发明的第一个例子;
图2为乘法器的一个例子。
借助于图1所示例,此发明将得以描述和说明。
图1中所示四象限光探测器有4个光电二极管A、B、C和D。两个相邻设置的光电二极管A和B的输出信号被送至差分放大器V1的加法输入端,而另两个相邻设置的光电二极管C和D的输出信号与差分放大器V1的减法输入端连接。所有四个光电二极管A、B、C和D的输出信号还在加法放大器V2中相加。加法放大器V2和差分放大器V1的输出端通过滤波器F和相移器PH各自与乘法器M连接,而后者的输出端通过低通滤波器TP和放大器V3与求和点SU的一个输入端连接。在求和点SU的另一输入端处接有差分放大器V1的输出端。加有已经补偿的循迹误差信号的求和点SU的输出端与循迹控制电路的控制放大器V4连接。
还可以用一分束器将被信息介质折射的光束分开并将其一部分对
准第二光探测器。取代在加法放大器V2中由4个光电二极管A、B、C和D的输出信号得出的总和,还可将第二光探测器的输出信号送至乘法器M,因为它与这个和是等同的。
此发明源子这样的认识:在差分放大器V1输出端处的循迹误差信号中包含有信息介质上数据轨迹扭摆的频率。
通带宽度与信息介质上数据轨迹的扭摆频率相应的滤波器F和相移器PH对此发明的效能不是绝对必需的,但它们可改善偏移电压的补偿。
放大器V3输出端处的信号被送入循迹控制电路作为偏移补偿电压。因而所有偏移电压及其在光探测器PD和放大器V1及V2中所有偏移电压及其在光探测器PD和放大器V1及V2中诸如由元件老化或由温度变化而造成的变化得以补偿。
图2表示乘法器M的一个例子。乘法器M加有加法放大器V2的输出信号的一个输入端E1作为两个共同受控的转换开关U1和U2的相互连接的第一输入端,它们的第二输入端处于参考电位。加有差分放大器V1输出端处的循迹误差信号的乘法器M的第二输入端E2作为输出端与两个转换开关U1和U2的控制输入端相连的比较器K或限幅器的输入端。转换开关U1的输出端通过电阻R1与差分放大器DV的反向输入端相连。另一转换开关U2的输出端通过电阻R2与差分放大器DV通过处于参考电位的电容C2的非反向输入端相连。作为乘法器M的输出端A1的差分放大器DV输出端通过电容C1反馈至反向输入端。
比较器K将差分放大器V1输出端处的正弦形扭摆数据轨迹信号
转换成矩形信号。两共同受控转换开关U1和U2因而由比较器K以差分放大器V1输出端处的正弦形信号的频率来转换。差分放大器DV根据两个转换开关(U1和U2)的位置来在一个或另一个方向上对加法放大器V2输出端处的信号进行积分。
此发明适合作为光扫描装置的循迹控制电路,该装置扫描一数据轨迹以某一频率扭摆的光信息介质。
Claims (6)
1、用于光扫描装置的循迹控制电路,以此,光束由循迹控制电路引导跟踪唱片形信息介质上以某一频率扭摆的数据轨迹,并用聚焦控制电路会聚在信息介质上,而且光束从信息介质被折射到光探测器(PD),其特征在于光探测器(PD)的输出端与乘法器(M)的第一输入端连接,乘法器(M)的第二输入端加有循迹误差信号,并且乘法器(M)输出端处的信号通过低通滤波器(TP)送入循迹控制电路作为补偿电压。
2、权利要求1所述循迹控制电路,其特征在于光探测器(PD)为装有4个光电二极管(A、B、C、D)的四象限光探测器,其输出信号在加法放大器(V2)中相加,后者的输出端与乘法器的输入端连接。
3、权利要求2所述循迹控制电路,其特征在于两相邻设置的光电二极管(A、B)的输出信号被送至差分放大器(V1)的加法输入端,而另两个相邻设置的光电二极管(C、D)的输出信号被送至差分放大器(V1)的减法输入端,差分放大器(V1)的输出端与乘法器(M)的第二输入端及求和点(SU)的第一输入端连接,并且低通滤波器(TP)的输出端与求和点(SU)的第二输入端连接,用于循迹控制电路的控制信号可取自后者的输出端。
4、权利要求2或3所述循迹控制电路,其特征在于在差分放大器(V1)和乘法器(M)之间以及在加法放大器(V2)和乘法器(M)之间各装有一滤波器F。
5、权利要求2、3或4所述循迹控制电路,其特征在于相移器(PH)装在将放大器(V1、V2)连接到乘法器(M)的至少一个支路上。
6、权利要求2、3、4或5所述循迹控制电路,其特征在于第一和第二共同受控转换开关(U1、U2)相互连接的第一输入端作为乘法器(M)加有加法放大器(V2)的输出信号的第一输入端(E1),两个联动转换开关(U1、U2)的第二输入端处于参考电位,输出端与两个转换开关(U1、U2)的控制输入端连接的比较器或限幅器(K)的输入端作为乘法器(M)的第二输入端(E2),第一转换开关(U1)的输出端通过第一电阻(R1)与差分放大器(DV)的反向输入端连接,第二转换开关(U2)的输出端通过第二电阻(R2)与差分放大器(DV)通过处于参考电位的第一电容(C2)的非反向输入端连接,作为乘法器(M)输出端(A1)的差分放大器(DV)输出端通过第二电容(C1)反馈至反向输入端。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3936033.4 | 1989-10-28 | ||
DE3936033A DE3936033A1 (de) | 1989-10-28 | 1989-10-28 | Spurregelkreis |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1051445A CN1051445A (zh) | 1991-05-15 |
CN1020010C true CN1020010C (zh) | 1993-03-03 |
Family
ID=6392484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN90108694A Expired - Lifetime CN1020010C (zh) | 1989-10-28 | 1990-10-27 | 循迹控制电路 |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP0497785B1 (zh) |
JP (1) | JP2930716B2 (zh) |
KR (1) | KR100255044B1 (zh) |
CN (1) | CN1020010C (zh) |
AT (1) | ATE114380T1 (zh) |
AU (1) | AU6400590A (zh) |
DE (2) | DE3936033A1 (zh) |
ES (1) | ES2064762T3 (zh) |
FI (1) | FI921880A0 (zh) |
HK (1) | HK106595A (zh) |
HU (1) | HU208879B (zh) |
MY (1) | MY109481A (zh) |
TR (1) | TR24802A (zh) |
WO (1) | WO1991006950A1 (zh) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4323067A1 (de) * | 1993-07-10 | 1995-01-12 | Thomson Brandt Gmbh | G-Faktor-Abgleich |
DE4415508A1 (de) * | 1994-05-03 | 1995-11-09 | Thomson Brandt Gmbh | Abtastgerät mit Adaptation |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2602019B2 (ja) * | 1987-03-12 | 1997-04-23 | 富士通株式会社 | 光デイスク装置 |
-
1989
- 1989-10-28 DE DE3936033A patent/DE3936033A1/de not_active Withdrawn
-
1990
- 1990-09-21 ES ES90913699T patent/ES2064762T3/es not_active Expired - Lifetime
- 1990-09-21 JP JP2512857A patent/JP2930716B2/ja not_active Expired - Lifetime
- 1990-09-21 AT AT90913699T patent/ATE114380T1/de active
- 1990-09-21 WO PCT/EP1990/001606 patent/WO1991006950A1/de active IP Right Grant
- 1990-09-21 DE DE59007780T patent/DE59007780D1/de not_active Expired - Lifetime
- 1990-09-21 KR KR1019920700989A patent/KR100255044B1/ko not_active IP Right Cessation
- 1990-09-21 EP EP90913699A patent/EP0497785B1/de not_active Expired - Lifetime
- 1990-09-21 AU AU64005/90A patent/AU6400590A/en not_active Abandoned
- 1990-09-21 HU HU9201299A patent/HU208879B/hu not_active IP Right Cessation
- 1990-10-10 TR TR90/0992A patent/TR24802A/xx unknown
- 1990-10-23 MY MYPI90001853A patent/MY109481A/en unknown
- 1990-10-27 CN CN90108694A patent/CN1020010C/zh not_active Expired - Lifetime
-
1992
- 1992-04-27 FI FI921880A patent/FI921880A0/fi not_active Application Discontinuation
-
1995
- 1995-06-29 HK HK106595A patent/HK106595A/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE114380T1 (de) | 1994-12-15 |
EP0497785A1 (de) | 1992-08-12 |
CN1051445A (zh) | 1991-05-15 |
WO1991006950A1 (de) | 1991-05-16 |
KR100255044B1 (ko) | 2000-05-01 |
EP0497785B1 (de) | 1994-11-23 |
FI921880A (fi) | 1992-04-27 |
DE59007780D1 (en) | 1995-01-05 |
HU9201299D0 (en) | 1992-07-28 |
MY109481A (en) | 1997-02-28 |
HUT60873A (en) | 1992-10-28 |
AU6400590A (en) | 1991-05-31 |
KR920704283A (ko) | 1992-12-19 |
TR24802A (tr) | 1992-05-01 |
DE3936033A1 (de) | 1991-05-02 |
JP2930716B2 (ja) | 1999-08-03 |
ES2064762T3 (es) | 1995-02-01 |
FI921880A0 (fi) | 1992-04-27 |
HK106595A (en) | 1995-07-07 |
HU208879B (en) | 1994-01-28 |
JPH05501328A (ja) | 1993-03-11 |
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C14 | Grant of patent or utility model | ||
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C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
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