JPH0471273B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a guide track, and records information on a disk-shaped recording medium in which track address and sector address information are pre-formed for each track at a predetermined position on the guide track. The present invention relates to a recording/reproducing device for recording or reproducing information.

Conventional Structures and Their Problems In recent years, so-called write-once optical disks that users can write on have begun to be used as file memories for large amounts of information.

For a disk with a spiral guide track, in order for the pick-up to always select a track with the same track address, it is necessary to jump one track at a fixed position of the disk once every time the disk rotates (hereinafter this operation is referred to as stay). call). In order to detect this fixed position on the disk, a conventional method is to provide a rotation start position mark (hereinafter referred to as an ID mark) on the disk and detect this ID mark to detect the relative position between the pick-up and the disk. It was getting worse. Referring to the drawing below, the ID mark signal (hereinafter referred to as ID
A conventional example of obtaining a signal (referred to as a signal) will be explained.

FIG. 1 is a format diagram of an optical disk to which the present invention is applied.

FIG. 2 is a block diagram showing an ID mark reading circuit of a conventional recording/reproducing apparatus.

In FIG. 1, 1 is an optical disk. 2 is a guide track, and guide track 2 has address parts A ₁ and A ₂ containing track address and sector address information.
~A _o and data sections D ₁ and D ₂ where data information is recorded
There is ~D _o . The guide track 2 is generally formed as a concave or convex groove in the base material of the optical disk.
The address parts A ₁ , A ₂ , ~A _o are the guide track 2
It is usually formed at the same time as the formation of the pit, and is formed as an uneven pit. 3 is an ID mark that is required when detecting the absolute position of the disk and pickup. This ID mark is made by adhering aluminum foil,
It is formed by a method such as vapor deposition of a mirror-like material. Or, as a forming method that takes into account the positional accuracy and productivity of this ID mark, the same method as the above-mentioned method of forming the address part,
It is formed together with the unevenness when forming the guide track and address part.

In FIG. 2, reference numeral 4 denotes a disc motor that rotates the optical disc 1 at a constant speed. Reference numeral 5 denotes an optical head for writing and reading data information on the optical disk 1. 6 is a linear motor that moves the optical head 5 to access a designated guide track. 7 is a V mark detector that detects the ID mark 3 on the optical disk using a reflective photo sensor or the like. 8 is a motor drive circuit that drives the disk motor 4. 9 is a linear motor drive circuit that drives the linear motor 6. Reference numeral 10 denotes a laser drive circuit for driving a semiconductor laser which is the light source of the optical head 5. Reference numeral 11 denotes a head amplifier that amplifies the signal extracted by the optical head 5. 12 is a focus/tracking circuit that controls focusing and trunking of the optical head 5; 13 is a modulation circuit that modulates the write information signal. 14 is the head amplifier 11
This is a demodulation circuit that demodulates the signal extracted by.
15 is an address reading circuit for reproducing an address from the signal from the head amplifier 11 and reading the address. 16 controls the above components
This is a controller circuit consisting of a CPU.

The operation of the conventional optical information recording/reproducing apparatus configured as described above will be described below.

First, the disk 1 is rotated at a constant speed by the disk motor 4. Next, the optical head 5 is subjected to focus control and tracking control by the focus/tracking circuit 12 to follow the guide track of the optical disk 1. Further, the optical head 5 accesses a predetermined guide track by a linear motor 6 activated by a linear motor drive circuit 9. The controller 16 reads the current track address where the optical head 5 is located using the address reading circuit 15, sets the difference from the target track address in the linear motor drive circuit 9, moves the linear motor 6, and searches for the target track. Further, the controller circuit 16 performs sequence control of focus pull-in, sequence control of tracking, and start-up control of the disk motor 4 and laser. Next, recording and reproducing data on the optical disc 1 will be explained. The modulation circuit 13 modulates the write data signal into a signal to be actually written on the optical disk. Next, the laser drive circuit 10 controls the optical output of the laser of the optical head 5 using this modulation signal to write data on the optical disk 1. During reproduction, the head amplifier 11 amplifies the signal read out by the optical head 5. The demodulation circuit 14 demodulates the reproduced signal obtained by the head amplifier 11. This reproduced signal also includes track address information in addition to the data information, and the address reading circuit 15 separates and extracts the track address signal from the data signal in the reproduced signal and reads the address.

The ID mark detector 7 is located on the optical disc 1 shown in FIG.
Detect ID mark 3. Stale jumping is performed based on this ID signal. The ID signal is also used to create a gate signal for extracting only the track address signal from the reproduced signal based on this ID signal, and to separate the data signal and the track address signal using this gate signal.

However, with this ID signal, disk eccentricity, ID
Due to variations in the mounting position of the mark detector 7, etc., the signal cannot accurately indicate the relative position between the disk and the optical head 5. Therefore, it was necessary to allow for some leeway in the system design.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a recording and reproducing device that can obtain accurate ID signals.

Configuration of the Invention The recording/reproducing device of the present invention has a circuit configuration in which the ID mark detector is eliminated and, instead, the waveform memory for storing the ID signal is biased. In the recording/reproducing apparatus of the present invention, a special track on which no data is recorded among the tracks of the optical disk is determined in advance as a format, and the special track is formatted before the apparatus performs normal recording/reproducing operation. The address signal is detected from the reproduced signal obtained from the head amplifier 11 at that time, and the sector address is detected from this address signal, and the timing is determined when the sector address indicating a predetermined sector (ID sector) corresponding to the ID mark is detected. The ID sector signal indicating this is stored in the waveform memory. During normal operation, the data stored in the waveform memory is
The ID sector signal is read, and stale jumping is performed based on the read ID sector signal.
Since the present invention eliminates the ID mark detector and uses an optical head to read the ID mark, jumping can be performed at a precise position on the disk.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a circuit configuration for obtaining an ID mark signal of a recording/reproducing apparatus according to an embodiment of the present invention.

In FIG. 3, a track address demodulation circuit 17 demodulates, for example, a PE (Phare Encoding) modulated address signal (track address signal).
18 is an ID sector address matching circuit (hereinafter referred to as ID No.
This circuit detects the sector address from the address signal demodulated by the track address demodulation circuit 17, and detects that it matches the sector address of the ID sector determined as the disk format. Reference numeral 19 denotes a circuit for checking whether or not there is an error in the track address data demodulated by the error detection circuit. ID No. Matching circuit 18
is output only when the error detection circuit 19 detects no error. 20 is write enable (WE)
A generation circuit generates an interval signal to be written to memory. 21 is a clock oscillation circuit (OSC), for example
Generates a 1MHz clock. 22 is a counter load pulse generation circuit which generates a pulse to the counter 23 to start the counter. counter 23
generates a memory address. 24 is a memory that stores the ID sector signal. Reference numeral 25 denotes a set-reset type flip-flop (hereinafter referred to as an FF circuit), which outputs a flag indicating whether the stored ID sector signal is erroneous.

26, 27 are NAND gates, 28 is NOR, 2
Reference numeral 9 denotes an inverter which switches between the stored ID sector signal and the disk motor rotation synchronization signal in response to a command from the controller 30 using these logic circuits.
The controller 30 recognizes whether there is an error in the demodulated track address, reads the track address, instructs writing to the memory, and switches between the stored ID sector signal and the disk motor rotation synchronization signal. , and performs various other controls of this recording/reproducing device.

The operation of the ID signal generating section of the recording/reproducing apparatus configured as described above will be explained below. FIG. 4 is a timing chart used to explain the operation.

In this embodiment, the format of the optical disk is such that a plurality of guide tracks on the innermost and/or outermost circumference of the disk are special tracks (evaluation tracks) on which no data information is recorded.

The operation of the recording/reproducing apparatus is divided into an initialization time at the start of operation and a normal time during normal recording/reproducing operation.

At the time of initialization, the memory ID sector signal output command of the controller 30 is OFF (L: output), and the output of the NAND gate 26 becomes "H".
Disk motor rotation synchronization signal is NAND gate 2
7, and is output from the NOR gate 28 as an ID signal. That is, during initialization, stale jumping is performed using the disk motor rotation synchronization signal as the ID signal.

Further, at the time of initialization, the optical head 5 searches for an evaluation track on the disk 1, and a reproduced signal of the evaluation track is obtained. Since this evaluation track is an area in which no data is recorded, the reproduced signal contains only a PE-modulated track address signal. Figure 4A shows the signal waveform. This reproduced signal is applied to a track address demodulation circuit 17, and track address data including a track address, sector address, error detection code, etc. is obtained.
The error detection circuit 19 checks whether there is an error in the track address data at this time. On the other hand, a rotation synchronization signal (FIG. 4C) is output from the motor drive circuit 8 in FIG. W.E.
The generating circuit 20 generates a memory write period (WE) signal (FIG. 4 H) during the period in which the disk rotates once in synchronization with the write command (FIG. 4 D) output by the controller 30. During the period when the WE signal is active, the ID No. matching circuit 18 becomes active, and only when the sector address in the demodulated track address data matches the ID sector address and no error is detected by the error detection circuit 19, the ID No. matching circuit 18 becomes active. A pulse signal (ID sector signal) as shown in Figure 4 (b) indicating that the sector addresses match is obtained.
Next, the counter load pulse generation circuit 22 generates a pulse for resetting the counter 23 in synchronization with the disk motor rotation synchronization signal. The counter 23 is reset by the pulse and counted up by the clock (frequency: 1 MHz) of the OSC 21 to sequentially generate memory addresses, which are applied to the address terminal of the memory 24. And at this time, the memory 24 is
Since the write operation mode is set by the WE signal and the ID sector signal (FIG. 4B) obtained from the ID No. matching circuit 18 is added to the memory 24, the memory 24 has a period corresponding to one rotation of the disk motor. The ID sector signal of counter 23
is stored according to the memory address from. When the write operation mode for one rotation of the disk ends, the memory 24 enters the read operation mode. At this time, the controller 30 reads the output of the FF circuit 25. The FF circuit 25 is reset by the write command from the controller 30 (Fig. 4 D), and the ID sector signal (Fig. 4 B) is reset.
Only when is output, the output Q of the FF circuit 25 becomes "H" level. Therefore, the controller 30 issues a write command, waits for the disk to rotate at least twice, reads the output of the FF circuit 25, and writes "L".
If it is the level, there is an error in the demodulated sector address, and the ID No. matching circuit is not outputting the ID sector signal. Therefore, the controller issues the write command again, or performs jumping on the adjacent track and issues the write command again on the new track, and repeatedly issues the write command until the output Q of the FF circuit 25 reaches the "H" level. . Output Q of FF circuit 25 is “H”
This indicates that the correct ID sector signal has been stored in the memory 25.

The above is the operation of the recording/reproducing apparatus when it is an initial driver. Next, normal operation will be explained.

In normal times, the ID stored from the memory 24
The sector signal is output in accordance with the memory address of the counter 23, which is generated in synchronization with the disk motor rotation synchronization signal. And at this time controller 3
0 memory ID sector signal output command is ON (H; output)
The storage ID sector signal from the memory 24 passes through the NAND gate 26 and the NOR gate 28.
This stored ID sector signal becomes an ID signal.

As described above, in this embodiment, the ID signal is not obtained using the ID mark detector 7 as shown in the conventional example, but the ID signal is obtained using the optical head 5 in advance.
Read the sector, store its ID sector signal in memory, and store the ID sector signal in this memory.
Since the ID sector signal is used as the ID signal, accurate
ID signal can be obtained. In this embodiment, the rotation synchronization signal of the disk motor is used as the signal for one rotation of the disk 1, but a signal obtained by a conventional ID mark detector may also be used as the signal for one rotation of the disk 1.

Effects of the Invention As described above, the present invention obtains an ID sector signal from a reproduced signal read by an optical head, and reliably stores this ID sector signal in a memory at the time of initialization before the recording/reproducing apparatus starts normal operation.
During normal operation, this stored ID sector signal is used as an ID signal, so the same optical head that reproduces the data information detects the ID signal.
An ID signal corresponding to the eccentricity of the disk can be obtained. Therefore, the ID detected using a conventional ID mark detector
A much more accurate ID signal can be obtained compared to conventional signals.
Furthermore, the present invention requires precise position adjustment in the past.
It also eliminates the need for an ID mark detector, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a format diagram showing the structure of a recording disk, FIG. 2 is a block diagram of a conventional optical information recording/reproducing device, and FIG. 3 is a diagram for obtaining an ID mark signal of a recording/reproducing device in an embodiment of the present invention. FIG. 4 is a timing chart used to explain the operation of FIG. 3. 1... Optical recording disk, 2... Guide track,
5...Optical head, 11...Head amplifier, 17
...Track address demodulation circuit, 18...ID sector address matching circuit, 19...Error detection circuit,
20...WE generation circuit, 23...Counter, 24
……memory.

Claims (1)

[Claims] 1. A disk having a guide track, in which a plurality of address information portions having track address and sector address information for each track are formed in advance at predetermined positions on the guide track, a disk drive unit for rotating the disk, and a disk drive unit for rotating the disk; an address information reading section for reading out address information from the disk through a pick-up; a detector for detecting a specific predetermined sector address from the address signal obtained by the address information reading section;
a counter that sequentially generates memory addresses based on a disk one rotation signal obtained by the disk drive unit; a memory that stores a predetermined sector address detection signal obtained by the detector according to the memory address of the counter; Means for reading the predetermined sector address detection signal stored in the memory from the memory according to the memory address of the counter, and using the read predetermined sector address detection signal as a reference for the disk. A recording/playback device for