US5297128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording/reproducing apparatus including means for varying intensity of a preheating light beam
Assignee: Canon Inc
•
Filing: 1992-12-02
•
Granted: 1994-03-22
•
Expires: 2012-12-02
Abstract
Abstract An optical information recording/reproducing apparatus provided with a device for irradiating an information track of an optical information recording medium with a preheating light beam. Simultaneously, a recording/reproducing light beam irradiates a light spot of the preheating light beam on the recording medium. The light intensity of the preheating light beam is varied in accordance with the environmental temperature of the apparatus detected by a detector. By such a construction, the recording/reproducing condition of information is kept constant, irrespective of the environmental temperature.
Inventors
- 👤 Eiji Yamaguchi
- 👤 Susumu Matsumura
- 👤 Hiroaki Hoshi
- 👤 Masakuni Yamamoto
- 👤 Hideki Morishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:13
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/02; G11B19/04; G11B19/046; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10504; G11B11/10506; G11B11/10515; G11B11/10595; G11B7/00; G11B7/004; G11B7/0045; G11B7/12; G11B7/125; G11B7/126
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
71 words
An optical information recording apparatus comprising: means for irradiating an information track of an optical information recording medium with a preheating light beam; means for irradiating a light spot of the preheating light beam with a recording light beam; detection means for detecting the environmental temperature of the apparatus; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 2
Dependent Claim
71 words
An optical information recording apparatus comprising: means for irradiating an information track of an optical information recording medium with a preheating light beam; means for irradiating a light spot of the preheating light beam with a recording light beam; detection means for detecting the environmental temperature of the apparatus; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 3
Dependent Claim
20 words
An optical information recording apparatus according to claim 1, wherein said optical information recording medium is a magneto-optical recording medium.
Claim 4
Dependent Claim
75 words
An information recording and/or reproducing apparatus comprising: means for irradiating an information track of a magneto-optical recording medium with a preheating light beam; means for irradiating a light spot of the preheating light beam with a recording light beam; means for detecting the amplitude of a signal reproduced from the magneto-optical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detecting means.
Claim 5
Dependent Claim
75 words
An information recording and/or reproducing apparatus comprising: means for irradiating an information track of a magneto-optical recording medium with a preheating light beam; means for irradiating a light spot of the preheating light beam with a recording light beam; means for detecting the amplitude of a signal reproduced from the magneto-optical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detecting means.
Claim 6
Dependent Claim
22 words
An apparatus according to claim 1, wherein the preheating light beam and the recording light beam have different wavelengths from each other.
Claim 7
Dependent Claim
29 words
An apparatus according to claim 1, wherein the size of the light spot of the preheating light beam is larger than the light spot of the recording light beam.
Claim 8
Dependent Claim
72 words
An optical information recording apparatus comprising: means for irradiating an information track of an optical information recording medium with a preheating light beam; means for irradiating the information track of the optical information recording medium with a recording light beam; detection means for detecting the environmental temperature of the apparatus; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 9
Dependent Claim
72 words
An optical information recording apparatus comprising: means for irradiating an information track of an optical information recording medium with a preheating light beam; means for irradiating the information track of the optical information recording medium with a recording light beam; detection means for detecting the environmental temperature of the apparatus; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 10
Dependent Claim
18 words
An apparatus according to claim 6, wherein the optical information recording medium is a magnetooptical information recording medium.
Claim 11
Dependent Claim
22 words
An apparatus according to claim 6, wherein the preheating light beam and the recording light beam have different wavelengths from each other.
Claim 12
Dependent Claim
29 words
An apparatus according to claim 6, wherein the size of a light spot of the preheating light beam is larger than a light spot of the recording light beam.
Claim 13
Dependent Claim
80 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical information recording medium with a preheating light beam; means for irradiating the information track of the magnetooptical information recording medium with a recording light beam; detection means for detecting the amplitude of a reproduction signal read out from the magnetooptical information recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 14
Dependent Claim
80 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical information recording medium with a preheating light beam; means for irradiating the information track of the magnetooptical information recording medium with a recording light beam; detection means for detecting the amplitude of a reproduction signal read out from the magnetooptical information recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 15
Independent Claim
70 words
A method of recording information in an optical information recording apparatus, said method comprising the steps of: irradiating an information track of an optical information recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and detecting the environmental temperature of the apparatus and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 16
Independent Claim
70 words
A method of recording information in an optical information recording apparatus, said method comprising the steps of: irradiating an information track of an optical information recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and detecting the environmental temperature of the apparatus and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 17
Dependent Claim
18 words
A method according to claim 11, wherein the optical information recording medium is a magnetooptical information recording medium.
Claim 18
Dependent Claim
22 words
A method according to claim 11, wherein the preheating light beam and the recording light beam have different wavelengths from each other.
Claim 19
Dependent Claim
29 words
A method according to claim 11, wherein the size of the light spot of the preheating light beam is larger than the light spot of the recording light beam.
Claim 20
Independent Claim
78 words
A method of recording information in an optical information recording/reproducing apparatus, said method comprising the steps of: irradiating an information track of a magnetooptical information recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and detecting the amplitude of a reproduction signal read out from the magnetooptical information recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 21
Independent Claim
78 words
A method of recording information in an optical information recording/reproducing apparatus, said method comprising the steps of: irradiating an information track of a magnetooptical information recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and detecting the amplitude of a reproduction signal read out from the magnetooptical information recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 22
Independent Claim
71 words
A method of recording information in an optical information recording apparatus, said method comprising the steps of: irradiating an information track of an optical information recording medium with a preheating light beam; irradiating the information track of the optical information recording medium with a recording light beam; and detecting the environmental temperature of the apparatus and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 23
Independent Claim
71 words
A method of recording information in an optical information recording apparatus, said method comprising the steps of: irradiating an information track of an optical information recording medium with a preheating light beam; irradiating the information track of the optical information recording medium with a recording light beam; and detecting the environmental temperature of the apparatus and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 24
Dependent Claim
18 words
A method according to claim 16, wherein the optical information recording medium is a magnetooptical information recording medium.
Claim 25
Dependent Claim
22 words
A method according to claim 16, wherein the preheating light beam and the recording light beam have different wavelengths from each other.
Claim 26
Dependent Claim
29 words
A method according to claim 16, wherein the size of a light spot of the preheating light beam is larger than a light spot of the recording light beam.
Claim 27
Independent Claim
74 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating the information track of the magnetooptical recording medium with a recording light beam; and detecting the amplitude of a reproduction signal read out from the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 28
Independent Claim
74 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating the information track of the magnetooptical recording medium with a recording light beam; and detecting the amplitude of a reproduction signal read out from the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 29
Dependent Claim
68 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light means for irradiating a light spot of the preheating light beam with a recording light beam; and means for detecting a reproduction signal read out from the magnetooptical recording medium and for varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 30
Dependent Claim
68 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light means for irradiating a light spot of the preheating light beam with a recording light beam; and means for detecting a reproduction signal read out from the magnetooptical recording medium and for varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 31
Dependent Claim
73 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light beam; means for irradiating the information track of the magnetooptical recording medium with a recording light beam; means for detecting a reproduction signal read out from the magnetooptical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 32
Dependent Claim
73 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light beam; means for irradiating the information track of the magnetooptical recording medium with a recording light beam; means for detecting a reproduction signal read out from the magnetooptical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 33
Independent Claim
73 words
A method of recording information in an optical information recording/reproducing apparatus, said method comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and detecting a reproduction signal read out from the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 34
Independent Claim
73 words
A method of recording information in an optical information recording/reproducing apparatus, said method comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and detecting a reproduction signal read out from the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 35
Independent Claim
71 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating the information track of the magnetooptical recording medium with a recording light beam; and detecting a reproduction signal read out from the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 36
Independent Claim
71 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating the information track of the magnetooptical recording medium with a recording light beam; and detecting a reproduction signal read out from the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 37
Dependent Claim
72 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light beam; means for irradiating a light spot of the preheating light beam with a recording light beam; detection means for optically detecting the temperature of the magnetooptical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 38
Dependent Claim
72 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light beam; means for irradiating a light spot of the preheating light beam with a recording light beam; detection means for optically detecting the temperature of the magnetooptical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 39
Dependent Claim
72 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light beam; means for irradiating the information track of the magnetooptical recording medium with a recording light beam; detection means for optically detecting the temperature of the magnetooptical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 40
Dependent Claim
72 words
An optical information recording/reproducing apparatus comprising: means for irradiating an information track of a magnetooptical recording medium with a preheating light beam; means for irradiating the information track of the magnetooptical recording medium with a recording light beam; detection means for optically detecting the temperature of the magnetooptical recording medium; and means for varying the light intensity of the preheating light beam in accordance with the detection result of said detection means.
Claim 41
Independent Claim
69 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and optically detecting the temperature of the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 42
Independent Claim
69 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating a light spot of the preheating light beam with a recording light beam; and optically detecting the temperature of the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 43
Independent Claim
69 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating the information track of the magnetooptical recording medium with a recording light beam; and optically detecting the temperature of the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
Claim 44
Independent Claim
69 words
A method of recording information in an optical information recording/reproducing apparatus, comprising the steps of: irradiating an information track of a magnetooptical recording medium with a preheating light beam; irradiating the information track of the magnetooptical recording medium with a recording light beam; and optically detecting the temperature of the magnetooptical recording medium and varying the light intensity of the preheating light beam in accordance with the detection result.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |