Patent EP0080256A2 successfully refreshed from Google Patents.
EP0080256A2
Expired / Lapsed
EP
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Information recording/reproducing apparatus
Assignee: Toshiba Corp
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Filing: 1982-09-17
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Granted: —
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Expires: 2002-09-17
Abstract
Abstract A data recording/reproducing apparatus is disclosed, which comprises an optical disk (10), a DC motor (12) for rotating the disk, a recording/reproducing head section (16) capable of being moved over the disk linearly in the radial direction of the disk, and a motor rotation control section (28) for controlling the rotation of the DC motor macroscopically approximately according to the constant linear velocity technique basis for individual track groups each consisting of a plurality of tracks formed on the disk, and according to the constant angular velocity technique basis for the individual tracks in each of the track groups.
Inventors
- 👤 Isao Hoshino
- 👤 Teruo Murakami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 14:15
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B19/00; G11B19/20; G11B19/24; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B7/00; G11B7/007; G11B7/00745
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
322 words
An apparatus for recording and reproducing information using a disk-shaped information-storing medium such as a recording disk (10), having motor means (12) for rotating said recording disk (10), head means (16) for defining, on said rotating disk (10), a plurality of tracks (T) each of which includes a plurality of information storing sectors (82, 84, 86, 90, 92, 94, 96) and for reproducing the information stored in at least one of the sectors (82, 84, 86, 90, 92, 94, 96) in a given one of the tracks (T), said head means (16) linearly moving in the radial direction of said recording disk (10), and the tracks being divided into a plurality of track groups (Tl, T2, Tm) each including a given number of adjacent tracks, characterized in that said apparatus comprising motor control means (28) connected to said motor means (12), for controlling the rotation of said motor means (12) on the basis of a constant angular velocity technique to cause the angular speed of said recording disk (10) to be made substantially constant while said head means (16) is tracing the tracks of a first track group (Tl), and for changing the angular speed, when said head means (16) is allowed to trace the tracks of at least a second track group (T2) adjacent to the first track group (Tl), to control the rotation of said motor means (12) on the basis of a constant linear velocity technique to cause the average linear speed of said recording disk (10) relative to said head means (16) during tracing of the tracks of the second track group (T2) to be made substantially equal to that during tracing of the tracks of the first track group (Tl), and that the sectors in the tracks in the first track group (Tl) has an average sector length substantially equal to the average sector length of the sectors in the tracks in the second track group (T2).
Claim 2
Independent Claim
322 words
An apparatus for recording and reproducing information using a disk-shaped information-storing medium such as a recording disk (10), having motor means (12) for rotating said recording disk (10), head means (16) for defining, on said rotating disk (10), a plurality of tracks (T) each of which includes a plurality of information storing sectors (82, 84, 86, 90, 92, 94, 96) and for reproducing the information stored in at least one of the sectors (82, 84, 86, 90, 92, 94, 96) in a given one of the tracks (T), said head means (16) linearly moving in the radial direction of said recording disk (10), and the tracks being divided into a plurality of track groups (Tl, T2, Tm) each including a given number of adjacent tracks, characterized in that said apparatus comprising motor control means (28) connected to said motor means (12), for controlling the rotation of said motor means (12) on the basis of a constant angular velocity technique to cause the angular speed of said recording disk (10) to be made substantially constant while said head means (16) is tracing the tracks of a first track group (Tl), and for changing the angular speed, when said head means (16) is allowed to trace the tracks of at least a second track group (T2) adjacent to the first track group (Tl), to control the rotation of said motor means (12) on the basis of a constant linear velocity technique to cause the average linear speed of said recording disk (10) relative to said head means (16) during tracing of the tracks of the second track group (T2) to be made substantially equal to that during tracing of the tracks of the first track group (Tl), and that the sectors in the tracks in the first track group (Tl) has an average sector length substantially equal to the average sector length of the sectors in the tracks in the second track group (T2).
Claim 3
Dependent Claim
97 words
An apparatus as claimed in claim 1, characterized by further comprising track assigning means for producing a first electrical signal (Sl) representing at least one of the tracks (T) formed on said disk (10), and data converter means (26) connected to said track assigning means (20) and to said motor control means (28), for receiving said first electrical signal and for converting said first electrical signal according to a predetermined data conversion system to produce a second electrical signal univocally corresponding to said first electrical signal and regulating the motor control operation of said motor control means.
Claim 4
Dependent Claim
180 words
An apparatus as claimed in claim 2, characterized in that said motor control means includes first frequency divider means (50) for receiving an oscillation signal (S4) having a reference frequency (f 0 ) and for frequency-dividing the oscillation signal (S4) by a predetermined fixed frequency-division factor (NO), second frequency divider means (52). connected to said first frequency divider means (50) and to said data converter means (26), for varying its frequency-division factor (Ni) in response to the second electrical signal (S3) and for dividing the output signal from said first frequency divider means (50) by the variable frequency-division factor (Ni) thereof, and motor driver means (54, 56) connected to said second frequency divider means (52) and to said motor means (12), for receiving the output signal from said second frequency divider means (52) and a third electrical signal (S5) representing the state of rotation of said motor means (12), and for controlling the rotation of said motor means (12) such that said third electrical signal (S5) and the output signal from said second frequency divider (52) coincide with each other.
Claim 5
Dependent Claim
71 words
An apparatus as claimed in claim 3, characterized in that said second frequency divider means (52) changes the variable frequency-division factor Ni thereof to be substantially equal to: where and said second frequency divider means (52) temporarily stops changing the variable frequency-division factor Ni to hold at a specific value while said head means (16) linearly moves within a predetermined range of distance corresponding to the width of each track group.
Claim 6
Dependent Claim
90 words
An apparatus as claimed in claim 4, characterized in that said frequency-division factor No of said first frequency divider means (50) and said number N R of pulses of said third electrical signal are selected such that the number of bits contained in a pertinent one of said tracks formed on said disk is equal to the product of No and N R , so that the frequency division factor Ni of said second frequency divider means (52) is substantially equal to the number of sectors in said pertinent track.
Claim 7
Dependent Claim
100 words
An apparatus as claimed in claim 3, characterized by further comprising second motor means (18) connected to said head means (16), for moving said head means linearly in the radial direction of said disk (10), and access control means (22) connected to said track assigning means (20) and to said second motor means, for controlling said second motor means (18) such that said head means (16) is brought to a position corresponding to at least one track represented by the first electrical signal while said first motor means (12) is being controlled for rotation by said motor control means (28).
Claim 8
Dependent Claim
106 words
An apparatus as claimed in claim 6, characterized in that said recording disk (10), which is controlled for rotation such that it is rotated approximately by the constant linear velocity technique for said individual track groups and by the constant angular velocity technique for the individual tracks in each of said track groups, has at the edge portion thereof a mark member (38) representing a reference position of said disk (10), the first sectors in said individual tracks formed on said disk (10) having the respective starting points substantially aligned along a reference line (80) connecting the center of said disk and said reference position (38).
Claim 9
Dependent Claim
166 words
An apparatus as claimed in claim 7, characterized by further comprising sector assigning means (34) for producing a fourth electrical signal (S7) representing at least one of a plurality of sectors in at least one of said tracks (T) formed on said disk (10), detector means (36) disposed in the vicinity of said rotating disk (10), for detecting said mark member (38) and generating a detection signal in response to the detection of said mark member (38), and sector retrieving means (32) connected to said sector assigning means (34) and to said detector means (36), for counting up sector numbers from a first sector contained in said at least one track and aligned with first sectors in the other tracks along said reference line (80) and for retrieving said at least one sector by detecting the coincidence of the count and the sector number represented by the fourth electrical signal (S7), the count content of said sector retrieving means (32) being reset by said detection signal.
References Cited (Backward Citations)
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