EP0376626A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical information recording medium with a separating part between information tracks
Assignee: Canon Inc
•
Filing: 1989-12-21
•
Granted: —
•
Expires: 2009-12-21
Abstract
Abstract An optical information recording medium having a recording surface formed by a recording layer (13) provided on a substrate (11), the recording surface being provided with parallel information tracks (1) each divided into plural blocks, each of which is formed by a data area for information recording and a servo area for forming prepits for tracking signal detection, wherein the data area has a separating part (8) the height of which is different from that of the information track and which is provided between information tracks adjacent to each other, and the difference in height is equal to or larger than the thickness of said recording layer, and wherein the servo area is not provided with the separating part.
Inventors
- 👤 Masakuni Yamamoto
- 👤 Shigeto Kanda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0938; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24079; G11B7/007; G11B7/00745
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
An optical information recording medium having a recording surface formed by a recording layer provided on a substrate, said recording surface being provided with parallel information tracks each divided into plural blocks, each of which is formed by a data area for information recording and a servo area for forming prepits for tracking signal detection: wherein said data area has a separating part the height of which is different from that of the information track and which is provided between information tracks adjacent to each other, said difference in height being equal to or larger than the thickness of said recording layer, and said servo area is not provided with said separating part.
Claim 2
Dependent Claim
113 words
An optical information recording medium having a recording surface formed by a recording layer provided on a substrate, said recording surface being provided with parallel information tracks each divided into plural blocks, each of which is formed by a data area for information recording and a servo area for forming prepits for tracking signal detection: wherein said data area has a separating part the height of which is different from that of the information track and which is provided between information tracks adjacent to each other, said difference in height being equal to or larger than the thickness of said recording layer, and said servo area is not provided with said separating part.
Claim 3
Dependent Claim
31 words
An optical information recording medium according to claim 1, wherein said difference in height between the information track and the separating part is in a range of 200 to 1,000 Å.
Claim 4
Dependent Claim
50 words
An optical information recording medium according to claim 1, wherein said difference in height between the information track and the separating part is equal to λ/4n, wherein λ is the wavelength of the light beam for reading information from said medium, and n is the refractive index of said substrate.
Claim 5
Dependent Claim
50 words
An optical information recording medium according to claim 1, wherein said difference in height between the information track and the separating part is equal to λ/2n, wherein λ is the wavelength of the light beam for reading information from said medium, and n is the refractive index of said substrate.
Claim 6
Dependent Claim
28 words
An optical information recording medium according to claim 1, wherein the surface of said servo area other than prepits and said separating area lie on a same plane.
Claim 7
Dependent Claim
32 words
An optical information recording medium according to claim 1, wherein the surface of said servo area other than prepits and the information track of said data area lie on a same plane.
Claim 8
Dependent Claim
37 words
An optical information recording medium according to claim 1, wherein said prepits comprise two wobbling pits positioned in mutually opposite sides in the direction of width of the information track with respect to the center line thereof.
Claim 9
Dependent Claim
22 words
An optical information recording medium according to claim 7, wherein said prepits further comprise a clock pit for detecting a clock signal.
Claim 10
Dependent Claim
17 words
An optical information recording medium according to claim 1, wherein said recording layer comprise a magnetic film.
Claim 11
Dependent Claim
19 words
An optical information recording medium according to claim 1, wherein said separating part has the form of a protrusion.
Claim 12
Dependent Claim
19 words
An optical information recording medium according to claim 1, wherein said separating part has the form of a groove.
Claim 13
Dependent Claim
16 words
An optical information recording medium according to claim 1, wherein said separating part has sloping sides.
Claim 14
Dependent Claim
22 words
An optical information recording medium according to any one of the preceding claims, when used for recording four-value or other multi-value information.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.