JPH0210488B2 - - Google Patents

Info

Publication number
JPH0210488B2
JPH0210488B2 JP61020499A JP2049986A JPH0210488B2 JP H0210488 B2 JPH0210488 B2 JP H0210488B2 JP 61020499 A JP61020499 A JP 61020499A JP 2049986 A JP2049986 A JP 2049986A JP H0210488 B2 JPH0210488 B2 JP H0210488B2
Authority
JP
Japan
Prior art keywords
recording
guide groove
light
light beam
recording medium
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.)
Expired - Lifetime
Application number
JP61020499A
Other languages
English (en)
Japanese (ja)
Other versions
JPS61210546A (ja
Inventor
Hiroshi Hanada
Masanao Kasai
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP61020499A priority Critical patent/JPS61210546A/ja
Publication of JPS61210546A publication Critical patent/JPS61210546A/ja
Publication of JPH0210488B2 publication Critical patent/JPH0210488B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
JP61020499A 1986-02-01 1986-02-01 記録媒体 Granted JPS61210546A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61020499A JPS61210546A (ja) 1986-02-01 1986-02-01 記録媒体

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61020499A JPS61210546A (ja) 1986-02-01 1986-02-01 記録媒体

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP50086399A Division JPS5210102A (en) 1975-07-15 1975-07-15 Recording medium

Publications (2)

Publication Number Publication Date
JPS61210546A JPS61210546A (ja) 1986-09-18
JPH0210488B2 true JPH0210488B2 (enrdf_load_stackoverflow) 1990-03-08

Family

ID=12028854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61020499A Granted JPS61210546A (ja) 1986-02-01 1986-02-01 記録媒体

Country Status (1)

Country Link
JP (1) JPS61210546A (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6383925A (ja) * 1986-09-26 1988-04-14 Mitsubishi Electric Corp 情報記録，再生及び／又は消去装置
JPH0827975B2 (ja) * 1986-11-17 1996-03-21 松下電器産業株式会社 光学情報記録再生デイスク

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL174591C (nl) * 1973-02-09 1984-07-02 Philips Nv Schijfvormig registratiedragerlichaam.
JPS577919B2 (enrdf_load_stackoverflow) * 1973-08-20 1982-02-13

Also Published As

Publication number Publication date
JPS61210546A (ja) 1986-09-18

Similar Documents

Publication Publication Date Title
JPS6214889B2 (enrdf_load_stackoverflow)
US4621353A (en) Optical memory system providing improved focusing control and improved beam combining and separating apparatus
NL192229C (nl) Inrichting voor het uitlezen van op een registratiedrager geregistreerde signalen.
EP0077644B1 (en) Optical memory system providing improved track following
EP0082716B1 (en) Methods of preformatting an optical disk
EP0077643B1 (en) Optical memory system providing improved focusing control
EP0092707A2 (en) Optical storage system employing a novel multi-layer optical medium
US4417331A (en) Method for manufacturing an optical disc
EP0092113A2 (en) Optical recording medium for use in an optical storage system and method for making such recording medium
EP0083193B1 (en) Apparatus for preformatting an optical disk
JPH0481816B2 (enrdf_load_stackoverflow)
US4383311A (en) Optical recording medium and information record with indented overcoat
US4562568A (en) Beam combining and separating apparatus useful for combining and separating reading and writing laser beams in an optical storage system
JPH0338657B2 (enrdf_load_stackoverflow)
US4888759A (en) Laser optical memory system having beam combining and separating apparatus for combining and separating reading and writing laser beams
JPH0210488B2 (enrdf_load_stackoverflow)
JPH0127494B2 (enrdf_load_stackoverflow)
JPH08147761A (ja) 情報記録媒体
JPS58100248A (ja) 光学的情報記録媒体
JP3496301B2 (ja) 光ディスク基板及び光ディスク
US4559622A (en) Optical memory system providing improved focus detection and control by detecting reflected beam diameter variations at spaced predetermined locations in the system
WO1999062061A2 (en) Optical recording medium
JP2656036B2 (ja) 光ヘツド
US6930962B2 (en) Optical information reading apparatus with super-resolution cut-off filter
JPS59193558A (ja) 光カ−ド