JPS5938970A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To detect easily the sector position in a recording/reproducing mode, by controlling in steps the revolution of a disk so as to obtain an integer number of sectors recorded on one round of the disk as well as to obtain approximately a constant linear speed of the disk to the recording/reproducing head. CONSTITUTION:The loci recorded concentrically are shown in the figure. The recording is carried out to the 1st sector 110 from a fixed position decided by a revolution reference position mark 101. The start position of the sector 110 is set at a fixed place regardless of the radius position of a disk. The 2nd sector 111 and the 3rd sectors 112-115 are recorded by shifting at random a recording/ reproducing head toward the radius of the disk. In this case, the number of sectors recorded on one round of concentric recorded loci is varied with each prescribed track number unit, and the number of sectors recorded on one round of a locus is always equal to an integer. Thus it is possible to detect easily the sector position in a recording/reproducing mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to an apparatus for recording and reproducing signals using a disk-shaped recording medium (hereinafter referred to as a disk).

[Prior art and its problems]

Most information recording and reproducing devices using conventional disks (e.g. magnetic F disk devices, turtle disk devices) operate at a constant angular velocity.
Rotate the disk with +゜ity (abbreviated as CAV) and press 'l'
This is to playback the recording session of f'i f's.

When the disc rotates at CAV, the positional relationship in the track direction of information recorded by dividing it into sectors based on the rotational reference position is such that the recording start position of each sector is aligned in the radial direction of the disc, so the sector during playback is Detection of the starting position can be easily performed.

However, because the rotation of the life cycle is CAV, the relative speed between the recording and playback speeds at the outer and circumferential areas of the disk changes, making it impossible to record and reproduce signals of the same quality on the inner and outer circumferences. It had

On the other hand, for signals where the information to be recorded is continuous, such as a television signal or audio 1, the linear velocity K is constant.
(Cons.tant L&ne Velocity:
There is also a method that increases the information recording capacity by rotating the disk (abbreviated as CLv). However, in an information recording/reproducing device that records and reproduces information in units of sectors, if the disk rotation is CLV, the recording start position of each sector will be different for each track, and it will take time to search for the desired sector during playback. It has the disadvantage of fc.

[Purpose of the invention]

The present invention has been made in view of the above points, and is a disc that records and reproduces recorded information by dividing it into a certain number of bits (hereinafter referred to as sectors; a sector includes accompanying data pits such as address information). In an information recording and reproducing device using a disc, the rotation is controlled in stages so that the number of sectors recorded in one rotation of the disc is an integral number, and the linear velocity of the rotating disc is approximately constant with respect to the recording/reproducing head.
An object of the present invention is to provide an information recording/reproducing device which improves recording capacity and facilitates detection of sector position 16 during recording/IIJ generation.

[Summary of the invention]

The present invention has the advantage that the recording start position of each sector is aligned in the radial direction of the disk within a single BL with a fixed number of tracks, and increases the recording capacity, which is a characteristic of constant linear velocity recording, on the entire disk. This method provides a specific means of rotation control that can control the rotation of the disk by changing the rotation speed in units of a fixed number of tracks, and controlling the rotation of the disk to a substantially constant linear velocity, and maintaining a constant angular velocity within a unit of a fixed number of tracks. The rotation of the disk is controlled so that the number of sectors recorded in one revolution is an integral number, and the recording start position of each sector at each rotational speed is generated by the control unit during recording and reproduction.

〔Effect of the invention〕

According to the present invention, since the rotation of the rotating disk is controlled in stages so that the linear velocity of the rotating disk is approximately constant with respect to the recording/reproducing head, it is possible to improve the recording capacity and improve the recording/reproducing head. The sector position can be detected easily and reliably.

That is, according to the present invention, when looking at a disk of information recorded as concentric recording trajectories from a macroscopic perspective, CLV recording is performed, so the physical length of each sector is approximately constant over the entire surface of the disk. The recording capacity is expected to increase. Furthermore, since CAV recording is performed within a predetermined number of tracks in which the amount of movement of the recording/reproducing section 16 is small, access is facilitated.

In other words, all relationships such as the rotational speed of the disk, the number of sectors included in a track, and the starting position of each sector are in one-to-one correspondence with the track position, so when a track position is specified, the sectors on the track are Since the number and starting position of each sector can be known, it is easy to detect sectors during one-pi recording/playback. Furthermore, by associating the disk rotation control system with the information signal system, when a track position is specified, the rotation speed of the disk at that track can be determined, so recording and playback can be performed on the specified track. At the same time as moving the head, it is possible to control the rotation so that the rotation speed of the disk in the specified trunk is reached, and the time required for rotation control that occurs during CLV control can be significantly reduced. playback head 1
Even when information is recorded/reproduced by moving 6 randomly, an increase in access time can be prevented.

Furthermore, by specifying the start position of each sector by the sector start pulse, it becomes easy to output 400 million sector positions during recording and reproduction at each rotation speed position, and reliability can be improved.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an information recording/reproducing apparatus according to the present invention.

The disk 1 is rotationally driven by a self-current motor 2. A rotary encoder 3 is provided coupled to the shaft of the DC motor 2. The linear motor 4 moves the recording/reproducing head 16 to the track position specified by the track specifying section 6 in response to a signal from the access control section 7. On the other hand, the track position signal designated by the track designation section 6 is also input to the data converter 8, converted into the number of sectors to be recorded at the designated track position, and inputted to the rotation control section 9. The rotation control unit 9 divides the frequency of the signal from the oscillator 10, compares the phase with the rotation signal obtained from the rotary encoder 3, and controls the rotation of the DC motor 3 so that the phase difference becomes zero. The signal from the oscillator 10 is also applied to the sector control section 12, which controls the transmission and reception of signals from the information input/output section 13 in sector units at sector positions designated by the sector designation section 11. - Also, a rotation reference signal detected by the detector 5 from the rotation reference position mark 101 provided on the disk is input to the sector control section 12, and the sector counter constituting the sector control section 12 is reset. 1iIJ) The information input/output section 13
is added to the recording/reproducing head 16 that sends and receives signals to and from the disk 1. During 99H12@ operation, it is added to the recording/playback head 16 that cuts the recording signal processing section 15, and records sectors on the disk 1! Recorded in units. During the reproduction operation, the signals recorded on the disc 1 are read by the recording/reproducing head 6, passed through the reproduction signal processing section 17, and read into the information input/output section 13 sector by sector. Data is set in the track designation section 6, sector designation section 11, and operation designation section 14 by signals from a control section (not shown). Similarly, the transmission and reception of signals to be recorded and read signals to the 1D information input/output 13 are not shown because they are not directly related to the present invention.

-, 1m, +-' (In the recording device, the number of sectors recorded in one rotation of the disk is kept at t≦several, and the disk is moved to CLV 1. The control system for controlling the transfer is shown in Figure 2.

Assuming that the data recording speed is the same as the oscillation frequency io of the oscillator IO and the wavelength of 1 bit on the disk is dp, the linear velocity V of the disk is expressed by the following equation.

V = fo? dp ・−・・−(x
JIf m. When the position of the reproducing head on the disk is a distance LFL from the center of the disk, the rotational speed R required to satisfy V in equation (1) is determined by the following equation.

R= V/2 K L R------...(2+On the other hand, not shown in Figure 2 [In the one-rotation control system, the rotation speed R of the disk
is expressed by the following equation.

]]1j=fO/N0-NR-Ni --(3)N
O is a fixed frequency division number, NR is the number of pulses per disc rotation of the rotary encoder 3, and Ni is the frequency division number of the variable frequency divider 19.

(1), (21, (From formula 31, the variable frequency division number Ni is expressed by the following formula. When N1 is changed to -r, one full revolution of one disk can be made to CLV by 1 mTl.

However, if the variational frequency Ni is an integer and Ni is constant for slight changes in at, the rotational speed of the disk will not change as shown by equation (:3) -a-, eAv control Equation (4) satisfies the wavelength ap17)i on an l-bit disk.

As described above, the bit It recorded in one rotation of the disk whose rotation is controlled is (No XNRXN1), and the number of bits that make up one sector is (No
, ) are determined to be equal, the variable frequency division number Ni becomes equal to the number of sectors recorded at each radial position LIt. Variable frequency division number Ni that satisfies equation (4) for the track number designated by the track designation section 6
(number of sectors) conversion table to data converter 8
By providing this, when the track superposition is input, the number of sectors recorded on that track is known, and the number of sectors becomes the frequency division number Ni set in the variable frequency divider 19.

FIG. 3 shows a sector control section for transmitting and receiving signals in units of sectors when the rotating f++IJ cape system is configured as Wg as described above. The oscillation frequency f of the oscillator 10 is equal to the number of beams constituting 17 vectors.
The frequency is divided by a fixed frequency divider 24 (XN1t), and the divided output signal is counted by a sector counter 25.

Further, the fixed frequency divider 24 and the sector counter 25 are cleared by a rotation reference position signal generated every time the disk rotates, which is detected by the detector 5 from the rotation reference mark 101 provided on the disk 1. Comparator 26 is sector designator 11
An information input/output unit that compares the sector number specified by the output of the sector counter 25 with the output of the sector counter 25, and when they match, outputs a recording/playback start signal (hereinafter referred to as sector start) to the information input/output unit. Reference numeral 13 uses the sector start pulse as a trigger pulse to record and reproduce information on the disk according to a predetermined method.

FIG. 4 shows an example of a disk configuration of information recorded as concentric recording trajectories in the information recording/reproducing apparatus according to the present invention.

% from the fixed position determined by the rotating pattern leather position mark 101
8I! Since one sector is recorded, the starting position of the first sector is the same rotational position regardless of the radial position of the disk 10. In the example shown in FIG. 4, the starting position 1Iij of the first sector 11 (l) is lined up on the line connecting the rotation reference position IW mark 101 and the center of the disk 1. In the figure, 111 is the second sector, and 112 is the second sector. Third sector, 113
is the (n+(m-2)l sector, 114th is the (n+(m-1)l sector, 115 is: @(n+rn
) sector, 116 is stripe n sector, 117 is a< (
n+1) Sectors 1-0h When the self-recording/reproducing head 16 is moved randomly in the radial direction of the disk 1 and self-recording is performed, the number of sectors recorded in ML in one round of the concentric recording locus is the predetermined number of tracks. The number of sectors recorded in one rotation of the trajectory is always an integer number, although it varies by unit.

It is clear that the present invention can be realized in the same way as long as the recording medium is disk-shaped, regardless of whether it is magnetic, optical, or optical.

In the embodiment, information is recorded on a disk-shaped recording medium as concentric recording trajectories, but it is clear that the same can be realized even if the recording trajectories are linear.

Furthermore, how to give the variable frequency division number 190 of the rotation control 9 may be determined by calculation so as to satisfy the equation (4).

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the information recording and reproducing apparatus of the present invention, FIGS. 2 and 3 are block diagrams showing an embodiment of individual parts of the information recording and reproducing apparatus of the present invention, and FIG. FIG. 2 is a diagram showing an example of recording on a disc recorded according to the present invention. DESCRIPTION OF SYMBOLS 1...Disc, 2...Motor, 3...Rotary encoder, 4...Linear motor, 5...Detector, 6...Track finger, 7...
Access control unit, 8... data converter, 9...
Rotation control section, 10... Oscillator, 11... Sector specification section, 12... Sector control section, 13... Information input/output section, 14... Operation specification section, 15... Recording signal processing section, 16...recording/reproduction head, 17... reproduction signal processing section. Figure 2 Figure 4

Claims (6)

[Claims] (1) In an information recording and reproducing device that self-records and reproduces information on a disk-shaped recording medium by moving a recording and reproducing head randomly in the radial direction of the d-recording medium and dividing information into units of a fixed number of bits. C1 The rotation of the disk-shaped recording medium is controlled by the output of a function generating means with a track number indicating the position of the nL recording/reproducing head on the recording medium as a variable, and the rotation of the disk-shaped recording/reproducing head and the disk-shaped 11 ( ) The relative speed with respect to the recording medium is kept constant at 1116, and starting from a rotation reference mark provided on the disk-shaped recording medium in units of a constant number of bits or time width corresponding to the unit of information recording 1.4
This information recording and reproducing device generates a signal, and records each 1-hour signal on a disc-shaped recording medium and records the C+ signal based on this starting position, with a bar difference of 1 digit. (2) Rotation control is such that rotation is performed in such a manner that an integer number of pieces of information from 1 minute to the middle of the IJ period are recorded on the disc-shaped ML recording medium as a concentric or spiral recording locus in units of a fixed number of bits. 2. The information recording and reproducing apparatus according to claim 1, wherein the information recording and reproducing apparatus controls: (3) Is the number of information units recorded once per revolution as concentric or radial recording trajectories of the disc-shaped recording medium from the inner circumference to the outer circumference of the disc-shaped recording medium on a predetermined track l?
! , the information recording and reproducing apparatus according to claim 2, wherein the information recording and reproducing apparatus changes depending on whether the position is changed or not. (4) All starting positions on the circumference of the first information unit of the information unit recorded in one circumference as a concentric or radial recording locus of the disc-shaped recording medium are provided on the disc-shaped recording medium. 3. The information recording and reproducing apparatus according to claim 2, wherein the position is a constant position on a circumference determined by a rotation reference position mark. (5) Rotation control of the disk-shaped recording medium is performed by combining the output signal of a rotary encoder provided to the motor to detect the rotation speed and a signal obtained by dividing the signal from the reference oscillator using a frequency divider according to the rotation speed. The cutting frequency divider is configured to include at least one slope variation divider, and the division number of the variable frequency divider corresponds to a track number indicating the position of the recording/reproducing head on the recording medium. An information recording and reproducing device described in a patent, characterized in that the output of a function generating means is a variable. (6) The frequency division number of the variable frequency divider is determined by the position of the recording/reproducing head on the recording medium. The information recording and reproducing method according to item 5 of the scope of the Zurotake permission request is characterized in that the number of the information units recorded in one round of the concentric or circular He recording locus of No. 9 (without track) {No. Device 9