US4821252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording and/or reproducing apparatus
Assignee: Ricoh Co Ltd
•
Filing: 1987-11-17
•
Granted: 1989-04-11
•
Expires: 2007-11-17
Abstract
Abstract An information recording and/or reproducing apparatus reproduces a pre-recorded address information from a recording medium when recording and/or reproducing a main information signal on and/or from the recording medium, where the address information is pre-recorded on substantially parallel tracks of the recording medium with a predetermined period. The information recording and/or reproducing apparatus comprises a first circuit for producing a reproduced signal by scanning one track on the recording medium, a second circuit for generating an address interval signal having a predetermined level during a time corresponding to an interval in which the address information is pre-recorded on the recording medium, and a third circuit for passing the reproduced signal from the first circuit only during the predetermined level of the address interval signal so as to obtain only the address information reproduced from the one track.
Inventors
- 👤 Masanobu Nishimiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B21/00; G11B21/02; G11B21/10; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B7/08; G11B7/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
An information recording and/or reproducing apparatus which reproduces a pre-recorded address information from a recording medium when recording and/or reproducing a main information signal on and/or from the recording medium, said address information being pre-recorded on substantially parallel tracks of the recording medium with a predetermined period, said information recording and/or reproducing apparatus comprising: first means for detecting a signal recorded on one track of the recording medium and for converting the signal detected into a reproduced signal; second means for generating an address interval signal having a predetermined level during a time corresponding to an interval in which the address information is pre-recorded on the recording medium; and third means for generating an output signal when both the reproduced signal from said first means and the address interval signal from said second means are received by said third means by passing the reproduced signal from said first means only during a time period in which the address interval signal has the predetermined level so as to obtain only the address information reproduced from said one track.
Claim 2
Dependent Claim
177 words
An information recording and/or reproducing apparatus which reproduces a pre-recorded address information from a recording medium when recording and/or reproducing a main information signal on and/or from the recording medium, said address information being pre-recorded on substantially parallel tracks of the recording medium with a predetermined period, said information recording and/or reproducing apparatus comprising: first means for detecting a signal recorded on one track of the recording medium and for converting the signal detected into a reproduced signal; second means for generating an address interval signal having a predetermined level during a time corresponding to an interval in which the address information is pre-recorded on the recording medium; and third means for generating an output signal when both the reproduced signal from said first means and the address interval signal from said second means are received by said third means by passing the reproduced signal from said first means only during a time period in which the address interval signal has the predetermined level so as to obtain only the address information reproduced from said one track.
Claim 3
Dependent Claim
32 words
An information recording and/or reproducing apparatus as claimed in claim 1 in which said second means derives the address interval signal from the reproduced signal which is received from said first means.
Claim 4
Dependent Claim
120 words
An information recording and/or reproducing apparatus as claimed in claim 1 in which said second means comprises a comparator supplied with the reproduced signal and a reference signal for comparing levels of the two signals, said reference signal having such a level that is higher than an amplitude of the address information reproduced as crosstalk from a track adjacent to said one track but is lower than an amplitude of the address information reproduced from said one track, and a retriggerable monostable multivibrator supplied with an output signal of said comparator for producing the address interval signal which has the predetermined level only during a time in which the amplitude of the reproduced signal exceeds that of the reference signal.
Claim 5
Dependent Claim
138 words
An information recording and/or reproducing apparatus as claimed in claim 1 in which said second means comprises an envelope detecting circuit for detecting an envelope of the reproduced signal, and a comparator supplied with an output envelope detection signal of said envelope detecting circuit and a reference signal for comparing levels of the two signals, said reference signal having such a level that is higher than an amplitude of the detected envelope corresponding to the address information reproduced as crosstalk from a track adjacent to said one track but is lower than an amplitude of the detected envelope corresponding to the address information reproduced from said one track, said comparator producing the address interval signal which has the predetermined level only during a time in which the amplitude of the detected envelope exceeds that of the reference signal.
Claim 6
Dependent Claim
66 words
An information recording and/or reproducing apparatus as claimed in claim 1 in which said recording medium is an optical disc comprising a spiral track made up of successive track turns constituting the substantially parallel tracks, said first means comprising an optical pickup device for reproducing information from said optical disc by use of a reproducing light beam which forms a light spot on said optical disc.
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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |