JPS589223A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the reliability of an optical recording and reproducing device by performing reproduction only when a laser beam follows a prescribed track normally through a track follow fault detecting means. CONSTITUTION:A playback signal of a prescribed sector read out of a recording disk 11 by an optical head 12, once sent to an envelope detecting means 16 via an amplifier 13, is stored in sector data memories 15a and 15b through a pulse generating means 14. During reproduction, the playback signal sent to the detecting means 16 is supplied to an envelope fault detecting means 17 to detect the occurrence of a fault; when the signal is normal, a command ON is supplied to a gate 20 and the output of the memory 15a or 15b is passed through the gate 20 and then led out through a digital demodulating means 21 and an error detecting/correcting means 22 for a pairty check, etc., thereby improving the reliability of the optical recording and reproducing device. If a fault is detected by the detecting means 17, a normalizing means 18 controls track follow correction.

Description

DETAILED DESCRIPTION OF THE INVENTION Misfires are related to optical recording and reproducing devices that use disks as recording media, and in particular, playback occurs only when the laser e-beam is correctly focused on a predetermined track. The present invention relates to an optical recording/reproducing device equipped with a function of performing data processing.

In the optical recording and reproducing method, whether or not the reproduced data contains errors is conventionally determined by IOC (Broror Ch@ck and Corr-) during Variteach ILt.
action), CRCC (Cyclllc Re
dundancyCh@ck Cod@), etc., or by checking for oscillation abnormalities such as VFO that generates pulses in synchronization with the reproduction signal], detection and correction can be performed to ensure data O reliability. It had been done.

In an optical recording/reproducing device, that is, an optical disk device, using a recording medium consisting of a pronged disc, 1 μm wide O-tskus lined up at a pitch of about 2 (jlffl) are irradiated with a laser beam for exactly 7 ohms. Therefore, as a means to increase the reliability of reproduced data, a track-forwarding servo mechanism is provided in addition to the above-mentioned means, but if disturbance noise or disk eccentricity is too large, this mechanism will fail. # There is a problem that the low limit may be dangerous and the reliability of data is lost. - Since optical discs store extremely large amounts of data, it is important to ensure that the reliability of the data is sufficient during recording and playback. It is necessary to take multiple measures to ensure that the track 7-4 error occurs, and in particular, it is necessary to take special measures against the above-mentioned track 7-4 abnormality. Added an abnormality detection means,
A function is provided to perform data processing on the memory contents after confirming that the beam has properly followed a predetermined track, or the above function is further combined with an error detection/correction means. This provides an optical storage/reproduction device using four optical discs, which improves data reliability.

That is, the present invention provides an optical storage/reproduction device that uses a nine-disc disk as a storage medium, in which one circumference is equally divided into m sectors.
The voltage of the envelope of the original signal is several 10 in the predetermined sector testing means which has one or more memories capable of storing three sectors worth of data and an envelope testing means, and is reproduced from the storage medium. [By)) When the length continuously decreases below the predetermined value, it is determined that there is an abnormality in the light spot control system, and the content of the above message is not transferred to the data processing unit, and the above-mentioned package is It has a function to transfer the contents of the memory to a data processing unit when it is determined to be normal by the connection inspection means, and perform data processing of the memory contents, and further to provide error detection/correction to the data processing unit. Because it is characterized by not having any functions.

Hereinafter, the present invention will be described as an example, and a schematic top view of an optical disk shown in 1st I@H, 1st I! 1 (Jl) and -) are used for the envelope shape diagrams in the normal and abnormal cases, and the functional diagram of the embodiment shown in Fig. 3.
This will be explained in detail.

In an optical disk-type optical storage/reproduction device, a pitch P of about 2 [μug] is usually placed on a disk 1 of 11800 (sg*) Ii degrees as a storage medium, as shown in No. 111.
A track 2 having a @W of 1 [#■] 1 degree is provided, and a bit signal 3 is chain-holeed onto the shell 2, and the desired spora) liKL is reflected by the laser beam 4] on the shell 2. The playback of the record is performed with the upper part of the page (
The arrow indicates the direction of travel). Therefore, as mentioned above, when the shell width W is very narrow, there may be cases where the laser beam does not accurately focus directly above the predetermined track due to disturbance noise during eccentricity of the recording disk, and in such a case, the reproduced signal No. 8
The 1N ratio decreases and the reliability of the data becomes a four-state envelope line S.
Also, the shape of the envelope line 6 of the abnormal state #4 is shown in the shape of the envelope line 6 of the abnormal state. 〉It will be difficult to detect the laser beam 0 track 4 error.And the above envelope I due to tracking and focusing 0 error.
i.

The voltage drop is at least several 10 biy) long and rises slowly, so in the case of digital recording, O@l"
／＠It can be clearly distinguished from the steep envelope fluctuation that occurs within a few bits at most, which occurs with the change in O′.＠ However, as mentioned above, the envelope In order to detect it, it is necessary to increase the number of time chambers such as a low-frequency P wave device (LP?), etc. 66 It takes almost 0 hours to detect, so it is not possible to simply add the above function to the conventional O optical disk device.
) 9yRunning #--An abnormality is detected and a situation arises in which 10% of the playback data has already been lost at the 9th point in time.

@* Is this invention K? - then the length of the above number 10 (biy)) - 1
In conjunction with an abnormality detection means (due to a drop in the envelope voltage O), the reproduced signals are temporarily pooled until the envelope test is completed.
For example, only the memory signal whose track follower was determined to be normal in the envelope wire inspection is 4" chimy, mcc,
The data is transferred to a data processing unit equipped with CRCC Misaki O error detection and correction function. In addition, it is desirable that the size of the message is 1 [sector 1 minute], but if the recorded information is further divided into many sectors, or if the time constant of the LPF for envelope inspection is large. It is better to have multiple memories to cover the fins.

FIG. 3 shows a functional diagram of an apparatus according to an embodiment of the present invention having two (3) sectors of memory. Pulsing means ll5a, 15b are sector data mem(s, 1
6 is an envelope line detection means, 1 is an envelope line abnormality detection means, 18
is a light spot control normalization means.

19 is means for generating a re-read command for the In/Reference 1m+1 sector section, 2G is a gate, and 21 is a digital demodulation means.

Reference numeral 22 represents an error detection/correction means p.sub.-4 and reference n represents a sector. In this device, a playback signal of 9 predetermined lengths read from the recording disk 11 by the optical head 12 is sent to the envelope detection means 111 via the amplifier 13 and simultaneously passes through the WCA axing means 14. Sector data of 4914m or 14bK is stored and sent to the envelope line detection means 16, and the reproduced signal is output to the envelope line abnormality detection means 1.
According to 7] If the presence or absence of envelope bell abnormality O is detected and it is normal, game)
! ! 61 (The solo instruction is given, and the data message 5 or 15b passes through the gate 20, and the digital demodulation means 21.

The error detection/correction means 22 such as mcc and CBCC are used to output the error. Also, when the abnormality detection means 17 detects an abnormality in the envelope route, a line m scissors sector l data mem 14 ha or 14 bK reset command is sent, and at the same time the light spot control normalization means 11 sends a reset command. The follow is corrected and the reread command generation means 19
A read command is issued. Then, the same process is repeated) The reproduced data, which is shielded from light and the track follow is normal, is processed and uploaded.

As explained above, in the optical disk type optical recording and reproducing apparatus of the present invention, the track follow is confirmed and corrected for each read sector, so that the reproduced signal is always in a normal track/7-track state. The reliability of 'G41 data is significantly improved as only data processing is performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the top of an optical disc, FIG. It is a functional diagram. In the figure, 1 is the recording disk, 2 is the track, and 3 is the pitch F.
signal, 4 is a laser beam, 5 is an envelope, 11 is a recording disk, 12 is an optical head, 13 is an amplifier, 14 is a pulsing means, 15m, 11Sb is a sector O data memory, 16
Reference numeral 17 indicates envelope line detection means, 17 indicates envelope line abnormality detection means, and 18 indicates optical point control normalization means 19 ij #a/#a+1 sector part re-read command generation. means, 20 is a gate, 21 is a digital demodulation means, 22 is an error detection/correction means, #4 and #4 are sectors,
P represents the pitch, W represents the track width, and 1 represents the envelope voltage.

Claims (1)

[Claims] 1. In an optical recording/reproducing device whose recording medium is a large disk whose circumference is equally divided into m sectors, 1.
It is capable of storing 1 or more data and has an envelope inspection means, and simultaneously transfers the original signal of a predetermined sector reproduced from the storage medium to the envelope inspection means. [Setter'] worth of □ data is temporarily stored in the memory, and in the envelope inspection means, the voltage of the envelope line of the original signal is continuously below a predetermined value over a length of several 1'O [Bidet 13 or more]. When the light spot control system is determined to be abnormal, the memory contents are transferred to the data processing unit. When the envelope inspection means determines that the light spot control system is normal, the previous memory contents are transferred to the data processing unit. An optical recording/reproducing device characterized in that it has a function of transmitting data and processing data of the contents of the mail. 2. The data processing section is equipped with error detection/correction means. An optical recording/reproducing apparatus according to claim 1, characterized in that: