JPS63103471A - Optical disk discriminating circuit for compatible optical disk device - Google Patents

Optical disk discriminating circuit for compatible optical disk device

Info

Publication number
JPS63103471A
JPS63103471A JP24925486A JP24925486A JPS63103471A JP S63103471 A JPS63103471 A JP S63103471A JP 24925486 A JP24925486 A JP 24925486A JP 24925486 A JP24925486 A JP 24925486A JP S63103471 A JPS63103471 A JP S63103471A
Authority
JP
Japan
Prior art keywords
optical disk
reference voltage
whether
rectangular wave
outputted
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
JP24925486A
Inventor
Hideki Doi
Original Assignee
Fujitsu General 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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP24925486A priority Critical patent/JPS63103471A/en
Publication of JPS63103471A publication Critical patent/JPS63103471A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To discriminate optical disks whose reflection factors are different from each other, by detecting whether a detected value is higher or lower than a set value, and discriminating the optical disk, based on said detection.
CONSTITUTION: When an optical disk 1 is loaded, it is rotated at a prescribed linear velocity, and also, the convergent light of laser of a prescribed output is radiated to the optical disk 1 through an objective lens L2, and the reflected laser light which is reflected erroneously by a track and a pit is detected by a detector 4. Subsequently, it is compared with a reference voltage outputted from a reference voltage source 6b by a comparator 6c through an adder circuit 5 and an amplifier 6a, and when the detecting signal has become higher than the reference voltage, a rectangular wave corresponding to its signal waveform is outputted. In accordance with whether this rectangular wave signal exists or not, whether the optical disk is an additional type or a reproduction exclusive type is discriminated.
COPYRIGHT: (C)1988,JPO&Japio
JP24925486A 1986-10-20 1986-10-20 Optical disk discriminating circuit for compatible optical disk device Pending JPS63103471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24925486A JPS63103471A (en) 1986-10-20 1986-10-20 Optical disk discriminating circuit for compatible optical disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24925486A JPS63103471A (en) 1986-10-20 1986-10-20 Optical disk discriminating circuit for compatible optical disk device

Publications (1)

Publication Number Publication Date
JPS63103471A true JPS63103471A (en) 1988-05-09

Family

ID=17190226

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24925486A Pending JPS63103471A (en) 1986-10-20 1986-10-20 Optical disk discriminating circuit for compatible optical disk device

Country Status (1)

Country Link
JP (1) JPS63103471A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0255451U (en) * 1988-10-14 1990-04-20
US4933923A (en) * 1988-01-26 1990-06-12 U.S. Philips Corporation Optical record carrier inscribed with read-out control data and apparatus for reading such record carrier in conformity with such control data
EP0386914A1 (en) * 1989-03-07 1990-09-12 Pioneer Electronic Corporation Disc player
US5257253A (en) * 1989-03-07 1993-10-26 Pioneer Electronic Corporation Laser vision disc with digital sound (LDD) disc player for reproducing analog audio signals mixed with digital audio signals
WO1999017287A1 (en) * 1997-09-30 1999-04-08 Deutsche Thomson-Brandt Gmbh Device for reading or writing on optical recording media with disk type recognition means
EP0910079A1 (en) * 1997-10-15 1999-04-21 Mitsumi Electric Company Ltd. Optical disc drive and method of discriminating optical discs
US6816443B1 (en) 1999-03-30 2004-11-09 Samsung Electronics Co., Ltd. Apparatus for discriminating optical disc and method therefor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4933923A (en) * 1988-01-26 1990-06-12 U.S. Philips Corporation Optical record carrier inscribed with read-out control data and apparatus for reading such record carrier in conformity with such control data
JPH0255451U (en) * 1988-10-14 1990-04-20
EP0386914A1 (en) * 1989-03-07 1990-09-12 Pioneer Electronic Corporation Disc player
US5257253A (en) * 1989-03-07 1993-10-26 Pioneer Electronic Corporation Laser vision disc with digital sound (LDD) disc player for reproducing analog audio signals mixed with digital audio signals
WO1999017287A1 (en) * 1997-09-30 1999-04-08 Deutsche Thomson-Brandt Gmbh Device for reading or writing on optical recording media with disk type recognition means
US6807136B1 (en) 1997-09-30 2004-10-19 Thomson Licensing S.A. Device for reading or writing on optical recording media with disk type recognition means
EP0910079A1 (en) * 1997-10-15 1999-04-21 Mitsumi Electric Company Ltd. Optical disc drive and method of discriminating optical discs
US6816443B1 (en) 1999-03-30 2004-11-09 Samsung Electronics Co., Ltd. Apparatus for discriminating optical disc and method therefor

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