JPS5555445A - Optical recording information reproducing device - Google Patents

Optical recording information reproducing device

Info

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
Application number
JP12725478A
Other languages
Japanese (ja)
Inventor
Hisatsune Tsuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP12725478A priority Critical patent/JPS5555445A/en
Publication of JPS5555445A publication Critical patent/JPS5555445A/en
Pending legal-status Critical Current

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
JP12725478A 1978-10-18 1978-10-18 Optical recording information reproducing device Pending JPS5555445A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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