Patent EP0100995A2 successfully refreshed from Google Patents.
EP0100995A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical disk
Assignee: Toshiba Corp
•
Filing: 1983-08-02
•
Granted: —
•
Expires: 2003-08-02
Abstract
Abstract A light reflective layer is formed on a transparent substrate of an optical disk. Grooves as tracking guides (4) are formed in the light reflective layer along the circumferential direction of the optical disk. A flat surface region (8) is formed between adjacent grooves (4) along the circumferential direction of the optical disk. Preformation pits 6 are formed in the reflective layer of the region (8). The groove (4) has a depth (preset to be λ8) which is equal to a width and depth of the preformation pit (6). The width of the groove (4) is determined to be one-half the laser beam spot diameter.
Inventors
- 👤 Hideo Ando
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 05:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
122 words
An optical disk comprising: a disk plate (10) having a light reflective layer (11); at least two tracking guides (4) formed on said light reflective layer (11) of said disk plate (10) and respectively defined by a groove having a predetermined depth h 0 so as to extend along a circumferential direction of said optical disk; a flat light reflective region (8) formed between said at least two tracking guides (4) along the circumferential direction; and first pits (6) formed by said light reflective layer (11) of said disk plate (10) and in said light reflective region (8); characterized in that said first pits (6) have a depth h 0 substantially the same as the predetermined depth h 0 of said grooves.
Claim 2
Dependent Claim
122 words
An optical disk comprising: a disk plate (10) having a light reflective layer (11); at least two tracking guides (4) formed on said light reflective layer (11) of said disk plate (10) and respectively defined by a groove having a predetermined depth h 0 so as to extend along a circumferential direction of said optical disk; a flat light reflective region (8) formed between said at least two tracking guides (4) along the circumferential direction; and first pits (6) formed by said light reflective layer (11) of said disk plate (10) and in said light reflective region (8); characterized in that said first pits (6) have a depth h 0 substantially the same as the predetermined depth h 0 of said grooves.
Claim 3
Dependent Claim
44 words
An optical disk according to claim 1, characterized in that the depth h 0 of said groove (4) and said first pits (6) is given by: where n is an integer and λ is a wavelength of a laser beam irradiating said optical disk.
Claim 4
Dependent Claim
39 words
An optical disk according to claim 1, characterized in that the depth h 0 of said groove (4) and said first pits (6) is given by: where λ is a wavelength of the laser beam irradiating said optical disk.
Claim 5
Dependent Claim
29 words
An optical disk according to claim 1, characterized in that the depth h 0 of said groove (4) and said first pits (6) is preset at about λ/8, respectively.
Claim 6
Dependent Claim
28 words
An optical disk according to claim 1, characterized in that each of said first pits (6) has a width substantially the same as that of said groove (4).
Claim 7
Dependent Claim
43 words
An optical disk according to claim 1, characterized in that each of said tracking guide (4) has a width W 0 /2, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of said optical disk.
Claim 8
Dependent Claim
43 words
An optical disk according to claim 1, characterized in that each of said first pits (6) has a width W 0 /2, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of said optical disk.
Claim 9
Dependent Claim
26 words
An optical disk according to claim 1, characterized in that each of said first pits (6) has a width smaller than that of said groove (4).
Claim 10
Dependent Claim
43 words
An optical disk according to claim 8, characterized in that each of said first pits (6) has a width W 0 /3, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of said optical disk.
Claim 11
Dependent Claim
26 words
An optical disk according to claim 1, characterized by further comprising second pits (12) formed by removing the light reflective layer (11) in said groove (4).
Claim 12
Dependent Claim
18 words
ll. An optical disk according to claim 1, characterized in that said groove (4) has a V-shaped section.
Claim 13
Dependent Claim
17 words
An optical disk according to claim 1, characterized in that said groove (4) has a U-shaped section.
Claim 14
Dependent Claim
18 words
An optical disk according to claim 1, characterized in that said groove (4) has an inverted trapezoidal section.
Claim 15
Dependent Claim
123 words
An optical disk comprising: a disk plate (10) having a light reflective layer (11); at least two tracking guides (4) formed on said light reflective layer (11) of said disk plate (10) and respectively defined by a ridge having a predetermined height h 0 so as to extend along a circumferential direction of said optical disk; a flat light reflective region (8) formed between said at least two tracking guides (4) along the circumferential direction; and a first projection (6) formed by said light reflective layer (11) of said disk plate (10) and in said light reflective region (8); characterized in that said first projection (6) have a height h 0 substantially the same as the predetermined height h 0 of said ridge.
Claim 16
Dependent Claim
123 words
An optical disk comprising: a disk plate (10) having a light reflective layer (11); at least two tracking guides (4) formed on said light reflective layer (11) of said disk plate (10) and respectively defined by a ridge having a predetermined height h 0 so as to extend along a circumferential direction of said optical disk; a flat light reflective region (8) formed between said at least two tracking guides (4) along the circumferential direction; and a first projection (6) formed by said light reflective layer (11) of said disk plate (10) and in said light reflective region (8); characterized in that said first projection (6) have a height h 0 substantially the same as the predetermined height h 0 of said ridge.
Claim 17
Dependent Claim
42 words
An optical disk according to claim 14, characterized in that the height of said ridge (4) and said first projection (6) is given by: where n is an integer and λ is a wavelength of a laser beam irradiating said optical disk.
Claim 18
Dependent Claim
37 words
An optical disk according to claim 14, characterized in that the height of said ridge (4) and said first projection (6) is given by: where a is a wavelength of the laser beam irradiating said optical disk.
Claim 19
Dependent Claim
27 words
An optical disk according to claim 14, characterized in that the height of said ridge (4) and said first projection (6) is preset at about λ/8 each.
Claim 20
Dependent Claim
26 words
An optical disk according to claim 14, characterized in that said first projection (6) has a width substantially the same as that of said ridge (4).
Claim 21
Dependent Claim
43 words
An optical disk according to claim 14, characterized in that each of said tracking guide (4) has a width W 0 /2, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of saia optical disk.
Claim 22
Dependent Claim
40 words
An optical disk according to claim 14, characterized in that said first projection (6) has a width W O/ 2, where W 0 is a spot diameter of the laser beam irradiating said flat surface region of said optical disk.
Claim 23
Dependent Claim
26 words
An optical disk according to claim 14, characterized in that each of said first projections (6) has a width smaller than that of said groove (4).
Claim 24
Dependent Claim
43 words
An optical disk according to claim 21, characterized in that each of said first projections (6) has a width W O /3, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of said optical disk.
Claim 25
Dependent Claim
25 words
An optical disk according to claim 14, characterized by further comprising second pits (12) formed by removing the light reflective layer (11) on said ridge.
Claim 26
Dependent Claim
145 words
An optical disk comprising: a disk plate (10) having a light reflective layer (11); at least two tracking guides (4) formed on said light reflective layer (11) of said disk plate (10) and respectively defined by a groove having a predetermined depth h 0 so as to extend along a circumferential direction of said optical disk; and a flat light reflective region (8) formed between said at least two tracking guides (4) along the circumferential direction; characterized further comprising recesses (26) formed on said light reflective layer (11) of said disk plate (10) and in said flat region (8) having a depth h 0 substantially the same as the predetermined depth h 0 of said groove (4); and flat bridge sections (24) defined between said recesses (26) and said groove (4) and said recess (26) in said flat region (8), which represent a code information.
Claim 27
Dependent Claim
145 words
An optical disk comprising: a disk plate (10) having a light reflective layer (11); at least two tracking guides (4) formed on said light reflective layer (11) of said disk plate (10) and respectively defined by a groove having a predetermined depth h 0 so as to extend along a circumferential direction of said optical disk; and a flat light reflective region (8) formed between said at least two tracking guides (4) along the circumferential direction; characterized further comprising recesses (26) formed on said light reflective layer (11) of said disk plate (10) and in said flat region (8) having a depth h 0 substantially the same as the predetermined depth h 0 of said groove (4); and flat bridge sections (24) defined between said recesses (26) and said groove (4) and said recess (26) in said flat region (8), which represent a code information.
Claim 28
Dependent Claim
43 words
An optical disk according to claim 24, characterized in that the depth h 0 of said groove (4) and said recesses (26) is given by: where n is an integer and A is a wavelength of a laser beam irradiating said optical disk.
Claim 29
Dependent Claim
38 words
An optical disk according to claim 24, characterized in that the depth h 0 of said groove (4) and said recesses (26) is given by: where X is a wavelength of the laser beam irradiating said optical disk.
Claim 30
Dependent Claim
28 words
An optical disk according to claim 24, characterized in that the depth h 0 of said groove (4) and said recesses (26) is preset at about λ/8, respectively.
Claim 31
Dependent Claim
27 words
An optical disk according to claim 24, characterized in that each of said recesses (26) has a width substantially the same as that of said groove (4).
Claim 32
Dependent Claim
43 words
An optical disk according to claim 24, characterized in that each of said tracking guide (4) has a width W O/ 2, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of said optical disk.
Claim 33
Dependent Claim
42 words
An optical disk according to claim 24, characterized in that each of said recesses (26) has a width W O /2, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of said optical disk.
Claim 34
Dependent Claim
25 words
An optical disk according to claim 24, characterized in that each of said recesses (26) has a width smaller than that of said groove (4).
Claim 35
Dependent Claim
42 words
An optical disk according to claim 31, characterized in that each of said recesses (26) has a width W O/ 3, where W 0 is a spot diameter of the laser beam irradiating said flat surface region (8) of said optical disk.
Claim 36
Dependent Claim
24 words
An optical disk according to claim 24, characterized by further comprising pits (12) formed by removing the light reflective layer in said groove (4).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.