JPS5555445A - Optical recording information reproducing device - Google Patents
Optical recording information reproducing deviceInfo
- Publication number
- JPS5555445A JPS5555445A JP12725478A JP12725478A JPS5555445A JP S5555445 A JPS5555445 A JP S5555445A JP 12725478 A JP12725478 A JP 12725478A JP 12725478 A JP12725478 A JP 12725478A JP S5555445 A JPS5555445 A JP S5555445A
- Authority
- JP
- Japan
- Prior art keywords
- disc
- tracking
- beams
- reflection lights
- irradiation
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To perform accurate tracking in a simple constitution by receiving reflection lights dependent upon irradiation of reading and tracking beams and comparing both light receiving quantities after delaying one of them.
CONSTITUTION: One and the other of a laser beam divided into two by beam splitter 22 become a reading beam and a tracking beam respectively and irradiate disc 27. Reflection lights from disc 27 dependent upon this irradiation are detected by light receiving elements 29 and 30 and are compared through amplifiers 31 and 33 of the same amplification factor by differential amplifier 32 to subject object lens 26 to servo control so that the amplification output may be zero. In this case, detection signals of one element 30 are subjected to delay processing through delay circuit 35 so that both beams may be reflection lights from the same position of disc 27. Consequently, accurate tracking is performed in a simple constitution using two light beams, and reproducing signals have S/N improved.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12725478A JPS5555445A (en) | 1978-10-18 | 1978-10-18 | Optical recording information reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12725478A JPS5555445A (en) | 1978-10-18 | 1978-10-18 | Optical recording information reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5555445A true JPS5555445A (en) | 1980-04-23 |
Family
ID=14955490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12725478A Pending JPS5555445A (en) | 1978-10-18 | 1978-10-18 | Optical recording information reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5555445A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58220252A (en) * | 1982-06-16 | 1983-12-21 | Hitachi Ltd | Detecting circuit of tracking error signal of optical pickup |
JPS6015833A (en) * | 1983-07-07 | 1985-01-26 | Canon Inc | Tracking controller |
JPS60103528A (en) * | 1983-11-10 | 1985-06-07 | Sanyo Electric Co Ltd | Tracking control device of optical disc device |
JPS60132621U (en) * | 1984-02-10 | 1985-09-04 | 旭光学工業株式会社 | Tracking servo circuit |
-
1978
- 1978-10-18 JP JP12725478A patent/JPS5555445A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58220252A (en) * | 1982-06-16 | 1983-12-21 | Hitachi Ltd | Detecting circuit of tracking error signal of optical pickup |
JPS6015833A (en) * | 1983-07-07 | 1985-01-26 | Canon Inc | Tracking controller |
JPH0547900B2 (en) * | 1983-07-07 | 1993-07-20 | Canon Kk | |
JPS60103528A (en) * | 1983-11-10 | 1985-06-07 | Sanyo Electric Co Ltd | Tracking control device of optical disc device |
JPS60132621U (en) * | 1984-02-10 | 1985-09-04 | 旭光学工業株式会社 | Tracking servo circuit |
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