JPS6063769A - Disk device - Google Patents

Abstract

PURPOSE:To control a titled device easily and to set automactically a disk speed by the device itself without intervention of a host computer even when conducting storage and regeneration continuously over a long block by controlling the speed according to each unit consisting of plural blocks. CONSTITUTION:When the control circuit 23 is supplied with a block number to which access is made from a host computer, the control circuit 23 computes tracks, initiation sectors and speed information in the intended block by using a translation table of a memory circuit 16. Then the circuit 23 controls a speed control part 17 according to the speed information, and by driving a motor 2, it rotates an optical disk 1 at a rotation speed corresponding to that of the track, also converting a track number into a scale value. By driving a linear motor driver 18 until this scale value and a position detected by the output of position detector both correspond to each other, the circuit 23 transfers an optical head 12. Then the circuit 23 stores information in the optical disk 1 when a count value of a sector counter 10 and the initiation sector correspond to each other, and reproduces information stored on the optical disk 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disk device for recording information (data), for example.

[Technical blue application of the invention] In recent years, image information such as documents, which are generated in large quantities, is photoelectrically converted by two-dimensional optical scanning, and this photoelectrically converted image information is stored in an image storage device, or Recently, optical disk devices have been used as image storage devices in image information file devices that can retrieve and reproduce images as needed, and reproduce them as hard copies or soft copies.

Conventionally, such optical disk devices use an optical disk that stores information in a spiral shape, and an optical head that moves linearly in the radial direction of the optical disk using a linear motor is used to store or reproduce information. It looks like this. The above-mentioned optical head is positioned several tens of microns below by a positioning method using a position detector using a non-contact optical linear scale and an optical mask using the principle of overlapping gratings.

By the way, in such an optical disk device, as the light beam moves outward, the rotation speed of the optical disk is set to R, that is, the speed is constant when looking at the optical disk from the optical head, so that storage and playback can be performed. It is designed to do this.

[Problems with cost technology] One possible method for controlling such a constant linear velocity is to change the rotational speed of the optical disk for each track.
This method is not practical because the number of tracks becomes enormous and control becomes difficult. In addition, a certain length of a track is treated as one block, each block is numbered, and multiple blocks are regarded as one unit, and the rotation speed is calculated for each set of blocks corresponding to the access target specified by the host computer. Although the method has been changed, in this method, the rotation speed is always set according to the target to be accessed by commands from the host computer.
Even when continuously storing and reproducing long blocks, there is a problem in that the host computer must always intervene.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and it is easy to control and can be performed by the device itself without the intervention of a host computer even when storing and reproducing continuous long blocks. The object of the present invention is to provide a disk device that can automatically set the speed (number of revolutions) of the disk.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides a disk device that rotates a disk having spiral or concentric tracks at a substantially constant linear velocity and stores or reproduces data. One block has a certain length, and for each block (1) there is a means for reading a given block number, and a conversion table that assigns a number of rotations of the disk to each unit in advance, with multiple blocks as one unit. The apparatus is characterized by comprising a storage means for storing the data, and a control means for comparing the block number read by the block number reading means with a conversion table in the storage means and setting the number of revolutions of the disk. .

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

In FIG. 1, an optical disk (disc) 1 is connected to a motor 2.
It is designed to be rotationally driven by. As shown in FIG. 2, the optical disc 1 has a donut-shaped metal coating layer such as Deluru or bismuth coated on the surface of a circular substrate made of glass or plastic, for example. A notch, that is, a reference position mark 1, is provided near the center. Further, on the optical disk 1, the reference position mark 1A is set at 1'.
The OJ is divided into 256 sectors of 0 to 255J.

On the optical disk 1, variable length information (image information) is stored over a plurality of blocks,
300,000 blocks of information are stored on 36,000 tracks on the optical disk 1. The number of sectors in one block on the optical disc 1 is, for example, 40 sectors on the inner side and 20 sectors on the outer side. In addition, if each block does not end at the sector switching position, as shown in the first block and the first block shown in FIG. It has become. The block number is at the start position of the above block,
A block header A consisting of a track number and the like is stored (block forming means), for example, when data is stored.

Here, the construction of the data blocks divided into blocks will be explained with reference to FIG. Figure 3 (
A block area BL of a certain length as shown in a) is formed with gaps Qa on both sides, and this block area BL is further divided into a header data section and an encoded data section B. As shown in the third part (b), the header data section A has an intra-header frame number area A1, a block number area Δ2, and a track number area Δ3, after which a dummy data area Δ4 is provided. ing. Corresponding data will be recorded in each of these areas. Incidentally, the above ladder data is stored when data is stored, but the present invention is not limited to this, and it may be preformatted in advance to a3 <
You can do it like this.

The motor 2 is constituted by a Hall motor whose rotational speed is controlled by a speed section 17, which will be described later. As shown in FIG. 4, a disc 4 on which signal generation marks 4M are set at regular intervals is fixed to the information 3 of the motor 2. Optical detection is performed by a detector 7 consisting of a light emitting diode and a light receiving element. Further, a detector 8 consisting of a light emitting diode and a light receiving element is provided below the disk 1 to optically detect the reference position mark 1A. The output of the detector 7, that is, the output of the light-receiving element, is supplied via the amplifier 9 to the clock pulse input terminal of a sector counter 10, and the output of the detector 8, that is, the output of the light-receiving element, is supplied to the reset input terminal of the sector counter 10. is supplied via amplifier 11.

Further, below the optical disc 1, an optical head 12 for storing and reproducing information is stepped and movable in the radial direction of the optical disc 1. This optical head is a well-known one that includes, for example, a semiconductor laser oscillator, a collimating lens, a beam splinter, a λ/4 wavelength plate, an objective lens, and an optical receiver. The output of the optical head 12 is supplied to a binarization circuit 13.
The signal binarized by the digitization circuit 13 is demodulated by the demodulation circuit 14, and the demodulated signal is separated into the above-mentioned header data and encoded data by the data separation circuit 15 at the next stage, and sent to the control circuit 23. Supplied.

The optical head 12, the binarization circuit 13, the demodulation circuit 14, and the motor separation circuit 15 constitute data reading (and writing) means.

The control circuit 23 stores and reproduces the encoded data in accordance with the relationship of the encoded data in response to a command from a small combi coater (not shown), and also stores and reproduces the encoded data in a storage circuit, which will be described later, in particular in relation to the block number in the ffl N-header data. A predetermined number of disk rotations is calculated and output from the conversion table provided. The above memory circuit (memory means)
16 shows the speed information of the optical disc 1 for every 256 tracks as shown in FIG.
A conversion table is stored in which the number of sectors of a block corresponds to the number of the first block within 256 tracks at the above speed and the starting sector of that block.

- For example, the first -E-taper speed is set for block numbers O to 2458 as one unit, and the next block's 11
A second motor speed is set for 2459 to 5209 as a second unit, a third motor speed is set for the next set, and thereafter motor speeds are set sequentially for a plurality of blocks as a unit. . Specifically, each motor speed in this case is calculated and set within the control circuit. In addition, the Q11 control circuit v823, for example, when a block number to be stored or reproduced is supplied, the storage circuit (
Track number to write and access, starting sector %, f
3 is calculated, and the speed information is ff. The storage circuit 16 stores the speed information of the optical disk 1 for each rack, as described above, the number of sectors in one block that corresponds to this speed, and the 2561 - A conversion table is stored in which the number of the first block in the rack corresponds to the LLNQr+sector of that block. According to the control circuit 23, when the block number "10" is supplied from the host computer, the block number is between tracks 0 and 2b5 depending on the memory contents of the memory circuit 16.
If the block number of the first block in the track is rOJ and the starting sector is "00", the number of sectors in one block is 140J, and accordingly the block number is "1".
Calculate the number of tracks and sectors for "0". In other words, “
[(Target block number - first block number) x number of sets + 1) start sector) ÷ 256 + track number of first block] is j, the resulting quotient is the number of tracks and the remainder is the number of sectors, in this case , 1 to rack "1", the starting sector r 14.4 J is calculated.

The control circuit 23 controls the motor 2 so that the track of the optical disk 1 relative to the optical head 12 has a constant linear velocity by controlling the speed control unit 17 according to the speed information received at the time of access. This is the sign that rotates the . Furthermore, when the control circuit 23 calculates the track rjI number, it converts the track number into a scale value,
The linear motor driver 18 is driven until this scale value matches the position detected by the output of a position detector (not shown). This linear motor driver 18 is configured to move the optical head 12 by means of a linear motor mechanism 19 under the control of a control circuit 23, so that a beam of light from the optical head 12 illuminates a predetermined track. Above linear motor 11 Will 9
The optical head 12 is moved in the radial direction by d3 above the optical disk 1.

Further, the control circuit 23 causes the optical head 12 to start the playback operation when the count value of the sector counter 10 matches the start sector when the optical head 12 corresponds to the target track at the time of access. It is.

Further, the control circuit 23 modulates the storage data from the host computer with the modulation circuit 20 and outputs the data to the laser driver 21.
supply to. The driver 21 stores information by driving a semiconductor laser (not shown) within the optical head 12 in accordance with the supplied modulation signal.

Next, the operation in such a configuration will be explained.

For example, assume that a block number to be accessed is supplied to the control circuit 23 from a host computer (not shown). Then, the control circuit 23 uses the conversion table in the storage circuit 16 to calculate the track, start sector, and speed information of the target block.

That is, the control circuit 23 determines the speed information and the range of the track that includes the target block number in the conversion table, and calculates [((target block number - first block number)) according to the data in the track range. X sectors (dozens of starting sectors) ÷ 256 + track number of first block
The following calculation is performed, and the track number and start C vine of the target block are output as 0 based on the result of this calculation. This results in
The control circuit 23 controls the speed control section 17 according to the speed information. , the speed control section 17 controls the motor 2.
By driving the optical disc 1, the optical disc 1 is rotated at a rotational speed corresponding to the above-mentioned 1 to easy. Also,” 2:1-
From rack number ¥j1, flilJ I2I+circuit 23
converts the rack number into a scale value, and moves the optical head 12 by driving the linear motor driver 18 until this scale value matches the position detected by the output of a position detector (not shown). Close. Next, the control circuit 23 stores information on the optical disc 1 or reproduces information on the optical disc 1 when the 1-value of the sector counter 10 matches the start sector.

By moving the optical head 12 to other blocks in the same manner as described above, the track number corresponding to the block number is accessed, and information is stored from the starting sector.
Reproduction 16 The operation in which storage and reproduction is performed over a large number of blocks consecutively will be explained. The initial motor speed (disk rotation speed) is estimated based on the address specification from the post computer as described above, but if storage and playback are subsequently performed for a large number of blocks, the The reading means reads the block number in the header data on the disk and supplies it to the control circuit 23, so the control circuit 23 converts the motor speed corresponding to this read block number into the conversion table in the storage circuit 1G. Please refer to it and read it out.
() and sends a speed signal to the speed control unit 17.For example, if the current block number is "2458" and you want to move to the next block, the next block number is r2459. J, so when this number is read by the reading means, the control circuit 23 reads out the second speed information "2" from the storage circuit 16, calculates the speed corresponding to this, and uses the data as the speed. Control part 1
Send to 7. Since such speed calculation is performed for each block number, it is possible to automatically control the speed each time without receiving a command from the host computer.

[Effects of the Invention] As detailed above, according to the present invention, since the speed is controlled for each unit of a plurality of blocks, control is extremely easy compared to conventional control for each track. Moreover, to provide a disk device which can automatically set the speed (rotation speed) of the disk by itself without having to receive instructions from a host computer each time even when continuously storing and reproducing over long blocks. be able to.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram of the machine, FIG. 2 is a plan view showing the structure of an optical disc, and FIG.
Figures (a) and (b) are diagrams for explaining the data patterns to be stored. Figure 4 is a perspective view for explaining the relationship between the disk and the detector, and Figure 5 is a diagram showing an example of storing a conversion table. 1... Optical disc (disc), 2... ...
・Motor, 10... Sector counter, 12...
...Optical head, 13...Binarization circuit, 2
3...control circuit, 16...memory circuit (
storage means), 17... speed control section, 19...
... Linear motor special disaster, 21 ... Laser driver.

Claims (1)

[Claims] In a disk device u that stores or reproduces data by rotating a disk having a spiral or concentric track at a substantially constant linear velocity, 1 block, and for each block (a means for reading a given block number, and a conversion table that divides the number of rotations of the disk for each unit in advance, taking a plurality of blocks as one unit for the above block). The invention is characterized by comprising a storage means for storing the data, and a control means for comparing the block number read by the block number +=3 reading means with a conversion table in the storage means and setting the rotation speed of the disk. disk device.