US4403259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reading information from an information recording disc
Assignee: Universal Pioneer Corp
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Filing: 1981-09-28
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Granted: 1983-09-06
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Expires: 2001-09-28
Abstract
Abstract An apparatus for reading information from an information recording disc in which the information is recorded successively in the circumferential direction, which includes a timing signal generator for consecutively generating timing pulse signals at a rate proportional to the rotational speed of the recording disc. The apparatus repeats the jump-back operation during pause mode of operation in synchronism with the timing pulse signals.
Inventors
- 👤 Keiji Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:51
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B21/085; G11B19/00; G11B19/02; G11B19/20; G11B19/24; G11B27/00; G11B27/005; G11B27/007; G11B7/00; G11B7/08; G11B7/085; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
An apparatus for reading information from an information recording disc in which the information is recorded successively in the circumferential direction, which comprises: a pick-up transducer having a detecting spot which is to be aligned on a portion of said recording disc and for reading the information from said portion, recording disc drive means for rotating said recording disc in the vicinity of said pick-up transducer at a rotational speed which is variable with the radial position of said pick-up transducer with respect to said recording disc; pause signal generating means for producing a pause signal; timing pulse signal generating means for consecutively generating a timing pulse signals at a predetermined rate proportional to the rotational speed of said recording disc; jump pulse generating means for generating a jump pulse in synchronism with said timing pulse signals during a time period when said pause signal is present; and pick-up transducer positioning means connected to said pick-up transducer, for driving said pick-up transducer so that said detecting spot jumps by a predetermined radial distance on said recording disc in response to said jump pulse.
Claim 2
Independent Claim
183 words
An apparatus for reading information from an information recording disc in which the information is recorded successively in the circumferential direction, which comprises: a pick-up transducer having a detecting spot which is to be aligned on a portion of said recording disc and for reading the information from said portion, recording disc drive means for rotating said recording disc in the vicinity of said pick-up transducer at a rotational speed which is variable with the radial position of said pick-up transducer with respect to said recording disc; pause signal generating means for producing a pause signal; timing pulse signal generating means for consecutively generating a timing pulse signals at a predetermined rate proportional to the rotational speed of said recording disc; jump pulse generating means for generating a jump pulse in synchronism with said timing pulse signals during a time period when said pause signal is present; and pick-up transducer positioning means connected to said pick-up transducer, for driving said pick-up transducer so that said detecting spot jumps by a predetermined radial distance on said recording disc in response to said jump pulse.
Claim 3
Dependent Claim
51 words
An apparatus as defined in claim 1, in which said recording disc drive means rotates said recording disc at such a rotational speed that the relative velocity between said detecting spot and said recording disc is constant notwithstanding the radial position of said pick-up transducer with respect to said recording disc.
Claim 4
Dependent Claim
39 words
An apparatus as defined in claim 1, in which said recording disc drive means is adapted to maintain the rotational speed of said recording disc at a speed when said pause signal appears during when said pause signal lasts.
Claim 5
Dependent Claim
97 words
An apparatus as defined in claim 1, in which said jump signal generating means includes a flip-flop circuit adapted to be triggered by each of said timing pulse signals, an AND gate for passing therethrough pulse signals from said flip-flop circuit when it is triggered by the vertical synchronous pulse, a monostable multivibrator for producing a pulse with a predetermined pulse width at a time when it is triggered by the pulse passed through said AND gate, and a jump pulse generating circuit for producing said jump pulse in response to said pulse from said monostable multivibrator.
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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |