US4912697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for preventing recording errors due to a reduction in the relative speed between an information carrying light beam and a recording medium
Assignee: Canon Inc
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Filing: 1988-03-03
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Granted: 1990-03-27
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Expires: 2008-03-03
Abstract
Abstract Method and apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on the medium. The apparatus includes a device for irradiating the medium with a light beam, a device for causing relative reciprocal movement between the medium and the light beam, and a device for terminating or displacing the light beam on the medium, after the lapse of a predetermined period of time from a moment when the relative speed of the medium and the light beam is reduced below a predetermined speed. The method includes the steps carried out by the apparatus.
Inventors
- 👤 Masahiko Enari
- 👤 Satoshi Shikichi
- 👤 Fumiaki Kawaguchi
- 👤 Kenichi Suzuki
- 👤 Masayuki Usui
- 👤 Hiroshi Matsuoka
- 👤 Kazuhiko Matsuoka
- 👤 Hideki Hosoya
- 👤 Akio Aoki
- 👤 Kazuo Minoura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:21
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10851; G11B19/02; G11B19/04; G11B7/00; G11B7/08; G11B7/085; G11B7/12; G11B7/125; G11B7/126; G06K2207/00; G06K2207/1018
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
89 words
An apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on said medium, comprising: means for irradiating said medium with a light beam; means for producing relative reciprocal movement between said medium and the light beam; and means for terminating the irradiation of the light beam on said medium, after the lapse of a determined period of time from a moment when the relative speed of said medium and the light beam is reduced below a determined speed.
Claim 2
Independent Claim
89 words
An apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on said medium, comprising: means for irradiating said medium with a light beam; means for producing relative reciprocal movement between said medium and the light beam; and means for terminating the irradiation of the light beam on said medium, after the lapse of a determined period of time from a moment when the relative speed of said medium and the light beam is reduced below a determined speed.
Claim 3
Dependent Claim
58 words
An apparatus according to claim 1, wherein said irradiation terminating means comprises speed detecting means for detecting said relative speed; and time measuring means which initiates time measurement in response to a detection signal from said speed detecting means and, after the lapse of a determined period, supplies said light beam irradiating means with an irradiation terminating signal.
Claim 4
Dependent Claim
38 words
An apparatus according to claim 2, wherein said speed detecting means is adapted to reset said time measuring means in case said relative speed exceeds a determined speed within said determined period after the start of time measurement.
Claim 5
Dependent Claim
40 words
An apparatus according to claim 1, wherein said irradiation terminating means is adapted to terminate the irradiation of the light beam onto said medium, after the lapse of a determined period from a moment where said relative speed becomes zero.
Claim 6
Dependent Claim
14 words
An apparatus according to claim 1, further comprising means for setting said determined period.
Claim 7
Independent Claim
88 words
An apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on said medium, comprising: means for irradiating said medium with a light beam; means for producing relative reciprocal movement between said medium and the light beam; and means for displacing the irradiating position of the light beam on said medium, after the lapse of a determined period of time from a point in time when there is no relative movement between said medium and the light beam.
Claim 8
Independent Claim
88 words
An apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on said medium, comprising: means for irradiating said medium with a light beam; means for producing relative reciprocal movement between said medium and the light beam; and means for displacing the irradiating position of the light beam on said medium, after the lapse of a determined period of time from a point in time when there is no relative movement between said medium and the light beam.
Claim 9
Dependent Claim
60 words
An apparatus according to claim 6, wherein said irradiating position displacing means comprises speed detecting means for detecting said relative speed, and time measuring means which initiates time measurement in response to a detection signal from said speed detecting means, and, after the lapse of a determined period, supplies said irradiating position displacing means with an irradiating position displacing signal.
Claim 10
Dependent Claim
38 words
An apparatus according to claim 7, wherein said speed detecting means is adapted to reset said time measuring means in case said relative speed exceeds a determined speed within said determined period after the start of time measurement.
Claim 11
Dependent Claim
14 words
An apparatus according to claim 6, further comprising means for setting said determined time.
Claim 12
Dependent Claim
83 words
An optical information recording-reproducing apparatus comprising: means for irradiating an information recording medium with a light beam; and means for producing relative movement of the light beam and said medium; and means for recording information on a recording area provided in part of a face of said medium and/or reproducing information recorded in said recording area; wherein the irradiating position of the light beam is located outside said recording area when there is no relative movement between the light beam and said medium.
Claim 13
Dependent Claim
83 words
An optical information recording-reproducing apparatus comprising: means for irradiating an information recording medium with a light beam; and means for producing relative movement of the light beam and said medium; and means for recording information on a recording area provided in part of a face of said medium and/or reproducing information recorded in said recording area; wherein the irradiating position of the light beam is located outside said recording area when there is no relative movement between the light beam and said medium.
Claim 14
Dependent Claim
41 words
An apparatus according to claim 10, wherein the irradiating position of said light beam is located at a home position provided outside said recording area on the medium, when said light beam and the light beam are not in relative movement.
Claim 15
Independent Claim
89 words
An apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on said medium, comprising: means for irradiating said medium with a light beam; means for producing relative reciprocal movement between said medium and the light beam; and means for reducing the power of the light beam irradiating said medium, after a lapse of a predetermined period of time from a moment when the relative speed of said medium and the light beam is reduced below a determined speed.
Claim 16
Independent Claim
89 words
An apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on said medium, comprising: means for irradiating said medium with a light beam; means for producing relative reciprocal movement between said medium and the light beam; and means for reducing the power of the light beam irradiating said medium, after a lapse of a predetermined period of time from a moment when the relative speed of said medium and the light beam is reduced below a determined speed.
Claim 17
Dependent Claim
58 words
An apparatus according to claim 12, wherein said power reducing means comprises speed detecting means for detecting said relative speed; and time measuring means which initiates time measurement in response to a detection signal from said speed detecting means and, after the lapse of a determined period, supplies said light beam irradiating means with a power reducing signal.
Claim 18
Dependent Claim
38 words
An apparatus according to claim 13, wherein said speed detecting means is adapted to reset said time measuring means in case said relative speed exceeds a determined speed within said determined period after the start of time measurement.
Claim 19
Dependent Claim
14 words
An apparatus according to claim 12, further comprising means for setting said determined period.
Claim 20
Independent Claim
82 words
A method for recording information on a card-shaped optical information recording medium and/or for reproducing information recorded on the medium, comprising the steps of: reciprocally scanning a light beam and the medium relative to each other; and setting the power of the light beam in reproduction to a level suitable for tracking, but not to perform recording even if the relative velocity between the light beam and the medium becomes less than a predetermined velocity in an end area of the medium.
Claim 21
Independent Claim
82 words
A method for recording information on a card-shaped optical information recording medium and/or for reproducing information recorded on the medium, comprising the steps of: reciprocally scanning a light beam and the medium relative to each other; and setting the power of the light beam in reproduction to a level suitable for tracking, but not to perform recording even if the relative velocity between the light beam and the medium becomes less than a predetermined velocity in an end area of the medium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |