Patent US3538765A successfully refreshed from Google Patents.
Patent EP0777216A2 successfully refreshed from Google Patents.
EP0777216A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A high density optical disk and a method of high density recording
Assignee: Nikon Corp
•
Filing: 1996-12-05
•
Granted: —
•
Expires: 2016-12-05
Abstract
Abstract The current invention is directed to a high density disk and a method of manufacturing the high density disk. The high density is accomplished by narrowing the pitch and increasing the groove depth so as not to sacrifice any desireable features of the high density optical disk medium.
Inventors
- 👤 Hiroyuki c/o Nikon Corporation Matsumoto
- 👤 Seiji c/o Nikon Corporation Morita
- 👤 Masatoshi c/o Nikon Corporation Hayashi
- 👤 Satomi c/o Nikon Corporation Yoshibe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 16:50
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24079; G11B7/26; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10576; G11B11/10578; G11B11/10582; G11B11/10584; G11B7/007; G11B7/00718
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
127 words
A method of manufacturing optical disks for substantially reducing cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands; b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d = L/ (an) where a is a parameter variable, L is a laser wavelength used during the operations and n is a refraction index of an optical disk substrate; and c) further selecting said depth d so as to make the cross-talk equal to or less than -25dB while said first relation in said step b) is maintained.
Claim 2
Independent Claim
127 words
A method of manufacturing optical disks for substantially reducing cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands; b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d = L/ (an) where a is a parameter variable, L is a laser wavelength used during the operations and n is a refraction index of an optical disk substrate; and c) further selecting said depth d so as to make the cross-talk equal to or less than -25dB while said first relation in said step b) is maintained.
Claim 3
Dependent Claim
21 words
The method of substantially reducing cross-talk according to claim 1 wherein said parameter a is equal to or less than 4.
Claim 4
Independent Claim
106 words
A method of manufacturing optical disks for substantially reducing cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands; and b) selecting a depth of the grooves d, in relation to the lands to satisfy a first relation, d = L/ (an) where a is a parameter variable, L is a laser wavelength used during the operations and n is a refraction index of an optical disk substrate, said parameter ranges from 2.8 to 3.4.
Claim 5
Independent Claim
106 words
A method of manufacturing optical disks for substantially reducing cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands; and b) selecting a depth of the grooves d, in relation to the lands to satisfy a first relation, d = L/ (an) where a is a parameter variable, L is a laser wavelength used during the operations and n is a refraction index of an optical disk substrate, said parameter ranges from 2.8 to 3.4.
Claim 6
Independent Claim
132 words
A method of manufacturing optical disks for substantially reducing cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands; b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d = L/ (an) + m L/ (bn) where a and b are parameter variables, L is a laser wavelength used during the operations, m is an integer and n is a refraction index of an optical disk substrate, wherein said parameter a satisfies 5.2 ≤ a ≤ 6.8 while said parameter b satisfies 1.8 ≤ b ≤ 2.1, m being a natural number.
Claim 7
Independent Claim
132 words
A method of manufacturing optical disks for substantially reducing cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands; b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d = L/ (an) + m L/ (bn) where a and b are parameter variables, L is a laser wavelength used during the operations, m is an integer and n is a refraction index of an optical disk substrate, wherein said parameter a satisfies 5.2 ≤ a ≤ 6.8 while said parameter b satisfies 1.8 ≤ b ≤ 2.1, m being a natural number.
Claim 8
Dependent Claim
37 words
The method of substantially reducing cross-talk according to claim 12 wherein said parameter a satisfies 2.8 ≤ a ≤ 3.4 while said parameter b satisfies 1.8 ≤ b ≤ 2.1, m being a positive integer including 0.
Claim 9
Independent Claim
100 words
A method of manufacturing optical disks for substantially reducing thermal cross-talk during input and output operations to and from the optical disks each having grooves and lands comprising the steps of: a) specifying a track pitch between the grooves and the lands to be equal or less than 1.1 L where L is a laser wavelength used during the operations; and b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d = L/ (an) where a is a parameter variable and n is a refraction index of an optical disk substrate.
Claim 10
Independent Claim
100 words
A method of manufacturing optical disks for substantially reducing thermal cross-talk during input and output operations to and from the optical disks each having grooves and lands comprising the steps of: a) specifying a track pitch between the grooves and the lands to be equal or less than 1.1 L where L is a laser wavelength used during the operations; and b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d = L/ (an) where a is a parameter variable and n is a refraction index of an optical disk substrate.
Claim 11
Dependent Claim
19 words
The method of manufacturing optical disks according to claim 18 wherein said parameter a ranges from 2.061 to 3.022.
Claim 12
Dependent Claim
27 words
A method of manufacturing optical disks according to claim 18 wherein the track pitch between the grooves and the lands is equal or less than 0.96 L.
Claim 13
Dependent Claim
26 words
The method of manufacturing optical disks according to claim 18 or 25 wherein said parameter a ranges from 2.159 to 3.778 or from 2.061 to 3.487.
Claim 14
Dependent Claim
19 words
The method of manufacturing optical disks according to claim 25 wherein said parameter a ranges from 2.061 to 2.667.
Claim 15
Dependent Claim
29 words
A method of manufacturing optical disks according to claim 18 or 25 wherein the track pitch between the grooves and the lands is equal or less than 0.81 L.
Claim 16
Dependent Claim
29 words
The method of manufacturing optical disks according to claim 33 wherein said parameter a ranges from 2.267 to 3.778 or from 2.159 to 3.022 or from 2.159 to 2.386.
Claim 17
Dependent Claim
21 words
The method of manufacturing optical disks according to claim 25 or 33 wherein said parameter a ranges from 2.159 to 3.238.
Claim 18
Dependent Claim
27 words
The method of manufacturing optical disks according to claim 18, 25 or 33 wherein said parameter a ranges from 0.776 to 1.288 or from 1.365 to 1.959.
Claim 19
Dependent Claim
30 words
A method of manufacturing optical disks according to claim 18 wherein the depth of the grooves d in relation to the lands satisfies a first relation, d > L/ (4n).
Claim 20
Dependent Claim
28 words
The method of manufacturing optical disks according to claim 41 further comprising a step c) of further selecting said depth d so as to make Ipp/Io ≥ 0.2.
Claim 21
Dependent Claim
28 words
The method of manufacturing optical disks according to claim 41 further comprising a step c) of further selecting said depth d so as to make Ig/Io ≥ 0.5.
Claim 22
Dependent Claim
28 words
The method of manufacturing optical disks according to claim 41 further comprising a step c) of further selecting said depth d so as to make Pe/Pp ≥ 1.2.
Claim 23
Dependent Claim
28 words
The method of manufacturing optical disks according to claim 41 further comprising a step c) of further selecting said depth d so as to make Pe/Pp ≥ 1.3.
Claim 24
Independent Claim
106 words
A method of manufacturing optical disks for substantially reducing thermal cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands at a predetermined width ratio of the grooves and the lands; and b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d > L/ (4n) where L is a laser wavelength used during the operations and n is a refraction index of an optical disk substrate.
Claim 25
Independent Claim
106 words
A method of manufacturing optical disks for substantially reducing thermal cross-talk during input and output operations to and from the optical disks each having grooves and lands, data being stored on both the grooves and lands, comprising the steps of: a) specifying a track pitch between the grooves and the lands at a predetermined width ratio of the grooves and the lands; and b) selecting a depth of the grooves d in relation to the lands to satisfy a first relation, d > L/ (4n) where L is a laser wavelength used during the operations and n is a refraction index of an optical disk substrate.
Claim 26
Dependent Claim
30 words
The method of manufacturing optical disks according to claim 14, 15, 16, 18, 25, 33, 41 or 47 wherein said wavelength L is equal to or less than 690 nm.
Claim 27
Dependent Claim
19 words
The method of manufacturing optical disks according to claim 47 wherein said predetermined width ratio is larger than 1.
Claim 28
Dependent Claim
22 words
The method of manufacturing optical disks according to claim 47 wherein said predetermined width ratio is equal to or larger than 1.05.
Claim 29
Dependent Claim
22 words
The method of manufacturing optical disks according to claim 47 wherein said predetermined width ratio is equal to or larger than 1.08.
Claim 30
Dependent Claim
22 words
The method of manufacturing optical disks according to claim 47 wherein said predetermined width ratio is equal to or larger than 1.1.
Claim 31
Dependent Claim
26 words
The method of manufacturing optical disks according to claim 1, 7, 12 or 47 wherein said track pitch is equal to or less than 1.1 L.
Claim 32
Dependent Claim
26 words
The method of manufacturing optical disks according to claim 1, 7, 12 or 47 wherein said track pitch is equal to or less than 0.96 L.
Claim 33
Dependent Claim
26 words
The method of manufacturing optical disks according to claim 1, 7, 12 or 47 wherein said track pitch is equal to or less than 0.81 L.
Claim 34
Dependent Claim
31 words
The method of manufacturing optical disks according to claim 47 further comprising a step b) of further selecting said depth d so as to make Pp (groove) /Pp (land) > 80.
Claim 35
Dependent Claim
32 words
The method of manufacturing optical disks according to claim 38 further comprising a step b) of further selecting said depth d so as to make Pp (groove) / Pp (land) > 85.
Claim 36
Dependent Claim
26 words
An optical disk for substantially reducing cross-talk during input and output operations to and from the optical disk having the features specified in any previous claim.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.