JPS6459637A - Optical information recording and reproducing device - Google Patents
Optical information recording and reproducing deviceInfo
- Publication number
- JPS6459637A JPS6459637A JP21544487A JP21544487A JPS6459637A JP S6459637 A JPS6459637 A JP S6459637A JP 21544487 A JP21544487 A JP 21544487A JP 21544487 A JP21544487 A JP 21544487A JP S6459637 A JPS6459637 A JP S6459637A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- coil
- reg1
- current
- voltage
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To attain a small sized and low-cost voltage source by using a reference level of a signal fed to a spot moving means as a ground so as to connect a current flowing to the spot moving means to ground without giving to a reference voltage source of an analog signal. CONSTITUTION:A reference voltage Vref is formed from a power supply VCC by resistors R1, REG1 in a tracking control circuit 117. A resistor R5 connected to a plus terminal of a power operational amplifier 204 and a resistor R6 con nected to one terminal of a tracking coil 111 are connected to ground to use the voltage reference fed to the coil 111 as ground. That is, with the coil current zero, the applied voltage is a ground potential. Since the current IACT flowing to the coil 111 does not flow to the reference power source REG1, a small capacity is enough for the REG1. Thus, the reference power supply is made inexpensive and small in size. Since no fluctuation in the Vref due to a large current is caused, stable servo operation is realized. The above is applied similar ly to the focusing servo.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62215444A JP2685451B2 (en) | 1987-08-31 | 1987-08-31 | Optical information recording / reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62215444A JP2685451B2 (en) | 1987-08-31 | 1987-08-31 | Optical information recording / reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6459637A true JPS6459637A (en) | 1989-03-07 |
JP2685451B2 JP2685451B2 (en) | 1997-12-03 |
Family
ID=16672457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62215444A Expired - Fee Related JP2685451B2 (en) | 1987-08-31 | 1987-08-31 | Optical information recording / reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2685451B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108996343A (en) * | 2017-06-07 | 2018-12-14 | 株式会社日立大厦系统 | Lift checking system and elevator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5938936A (en) * | 1982-08-28 | 1984-03-03 | Sony Corp | Servo control circuit of information reproducer |
-
1987
- 1987-08-31 JP JP62215444A patent/JP2685451B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5938936A (en) * | 1982-08-28 | 1984-03-03 | Sony Corp | Servo control circuit of information reproducer |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108996343A (en) * | 2017-06-07 | 2018-12-14 | 株式会社日立大厦系统 | Lift checking system and elevator |
Also Published As
Publication number | Publication date |
---|---|
JP2685451B2 (en) | 1997-12-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |