Patent US4965153A successfully refreshed from Google Patents.
US4965153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Canon Inc
•
Filing: 1987-04-16
•
Granted: 1990-10-23
•
Expires: 2007-04-16
Abstract
Abstract An optical recording medium for writing and reading information by use of a beam of light comprises an optical recording layer comprising a light-reflective layer and a light-absorptive layer having been preformatted in the form of grooves.
Inventors
- 👤 Hiroyuki Imataki
- 👤 Mizuho Hiraoka
- 👤 Sachiko Ichikawa
- 👤 Hitoshi Yoshino
- 👤 Yoshihiro Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:25
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
A method of preparing an optically recorded member comprising a recording layer comprising a light reflective layer and a light absorptive layer, for writing and reading information using a light beam, said method comprising the steps of: forming the light absorptive layer on a non-pre-formatted substrate, the light absorptive layer having a first side and a second side, the first side being on the non-pre-formatted substrate; thereafter forming a pre-format of guide grooves using a stamper or a mold on the second side of the light absorptive layer; forming a light reflective layer on the second side of the light absorptive layer; and irradiating a laser beam on the thus created optical recording medium to form pits on the crest and/or the groove to effect recording.
Claim 2
Independent Claim
126 words
A method of preparing an optically recorded member comprising a recording layer comprising a light reflective layer and a light absorptive layer, for writing and reading information using a light beam, said method comprising the steps of: forming the light absorptive layer on a non-pre-formatted substrate, the light absorptive layer having a first side and a second side, the first side being on the non-pre-formatted substrate; thereafter forming a pre-format of guide grooves using a stamper or a mold on the second side of the light absorptive layer; forming a light reflective layer on the second side of the light absorptive layer; and irradiating a laser beam on the thus created optical recording medium to form pits on the crest and/or the groove to effect recording.
Claim 3
Dependent Claim
28 words
The method of preparing an optically recorded member as recited by claim 1, wherein said recording layer consists of the light reflective layer and the light absorptive layer.
Claim 4
Independent Claim
96 words
A method of preparing an optical recording medium comprising a recording layer comprising a light reflective layer and a light absorptive layer having a first side and a second side, for writing and reading information using a light beam, comprising the steps of: forming the light absorptive layer on a non-pre-formatted substrate, the light absorptive layer having on the first side the non-preformatted substrate; thereafter forming a pre-format of guide grooves using a stamper or a mold on the second side; and forming a light reflective layer on the second side of the light absorptive layer.
Claim 5
Independent Claim
96 words
A method of preparing an optical recording medium comprising a recording layer comprising a light reflective layer and a light absorptive layer having a first side and a second side, for writing and reading information using a light beam, comprising the steps of: forming the light absorptive layer on a non-pre-formatted substrate, the light absorptive layer having on the first side the non-preformatted substrate; thereafter forming a pre-format of guide grooves using a stamper or a mold on the second side; and forming a light reflective layer on the second side of the light absorptive layer.
Claim 6
Dependent Claim
28 words
The method of preparing an optical recording medium as recited in claim 3, wherein said recording layer consists of the light reflective layer and the light absorptive layer.
Claim 7
Dependent Claim
22 words
The method of preparing an optical recording medium according to claim 3, including providing a protective layer on the optical recording layer.
Claim 8
Dependent Claim
23 words
The method of preparing an optical recording medium according to claim 3, wherein the light-reflective layer has a reflectance of 15 to 60%.
Claim 9
Dependent Claim
23 words
The method of preparing an optical recording medium according to claim 3, wherein the light-reflective layer comprises a metallic or metallic particle-dispersed layer.
Claim 10
Dependent Claim
26 words
The method of preparing an optical recording medium according to claim 3, wherein the light-reflective layer has a thickness of from 20 Å to 1 mm.
Claim 11
Dependent Claim
24 words
The method of preparing an optical recording medium according to claim 3, wherein the light-absorptive layer comprises a light-absorptive material or light-absorptive material-dispersed layer.
Claim 12
Dependent Claim
21 words
The method of preparing an optical recording medium according to claim 6, wherein the light-absorptive material is a dye or pigment.
Claim 13
Dependent Claim
26 words
The method of preparing an optical recording medium according to claim 3, wherein the light-absorptive layer has a thickness of from 700 Å to 1.8 mm.
References Cited (Backward Citations)
US4318112A
Cited
US4363844A
Cited
US4519065A
Cited
JPS5774834A
Cited
US4547876A
Cited
JPS5938945A
Cited
US4616237A
Cited
JPS59171046A
Cited
US4729938A
Cited
US4651172A
Cited
US4818666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |