JPS61177087A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain stable steel operation by interpolating a one-rotation signal on the basis of an output signal previously stored in a storage means when the dropout of an one-rotation signal part of a track on a recording carrier due to dust, dirt or flaws and a detecting means does not detect the one-rotation signal. CONSTITUTION:A memory in an index detecting circuit 8 records a signal obtained by delaying an index pulse obtained by reproducing the recording carrier 1 by one rotation of the recording medium 1 with relative relation to a signal obtained from a position detecting element 9. If an index mark which is an output signal of a head amplifier 5 is lacked, a signal obtained by interpolating the index signal by a signal outputted from the memory is inputted to a jumping starting circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an information recording and reproducing apparatus that records or reproduces information using a signal conversion means on a disk-shaped record carrier having a track on which information is recorded or a spiral track for recording information. It is related to.

BACKGROUND OF THE INVENTION Recently, as a high-density recording technology, a disk is formed using a photosensitive recording material, the disk is rotated, and light from a laser or the like is irradiated to a microscopic diameter of 1 μm or less. 2. Description of the Related Art Signals are recorded or reproduced at a high density on a disk as changes in irregularities, hole shapes, shading, etc.

For example, optical video disks are well known among the above-mentioned technologies as devices for reproducing signals prerecorded at high density.

Furthermore, the technique for recording the above-mentioned signals is used in an apparatus for making master discs of video discs.

In addition, as a target for recording signals, video signals and audio signals are recorded in the optical recording and reproducing apparatus by irradiating the recording thin film on the disk with a laser beam and vaporizing the light irradiated part of the thin film, or Recording is performed by changing the reflectance and transmittance of the thin film. That is, it is common practice to thermally utilize the energy of laser light to change the optical properties of a recording material.

In order to perform high track density recording on the optical recording disk, guide tracks having a groove-like structure are provided in advance, and signals are recorded while applying tracking control to the guide tracks. The guide track reduces positional deviation of the recording light beam due to vibration of the device, and also allows signals to be recorded at any location on the optical recording disk.

Further, by recording a unique address in each track when cutting the master disc of the O optical recording disc, it becomes possible to randomly search any trunk of all the tracks of the optical recording disc.

The guide track is selected depending on the information or signal to be recorded, but generally has a spiral or concentric shape with respect to the center of the disk.

In terms of track density, spiral tracks are more advantageous than concentric tracks. This is because the track feeding accuracy of the master cutting machine is that compared to the concentric circular track that feeds intermittently, the spiral track that feeds continuously does not generate vibrations due to track feeding.
Moreover, this is because the influence of play in the feed screw mechanism is small.

However, unlike the case of concentric tracks, spiral track optical recording discs are one continuous track on the optical recording disc, so it is difficult to keep the optical head on the track at a predetermined address compared to concentric tracks. It's difficult to do. In order to concentrically track tracks at the same position on a spiral track, it is necessary to force the aperture light of the optical head to skip one track. At this time, when the optical head detects a signal indicating one revolution (hereinafter referred to as an index signal) provided in advance on the track in the tracking state, a jumping signal of a predetermined amplitude is applied from the outside to the optical recording disk. The vehicle was swung in the radial direction of the vehicle, missed the guide track, and applied the brakes when it hit the next guide track, thereby performing a stale operation in which the previously reproduced track was regenerated.0 Problems to be Solved by the Invention However, with the above configuration, if the index section provided on the track is scratched or soiled,
The reproduced signal will drop out and the index signal will not be detected. Then, since the track is in a spiral shape, the optical head is unable to perform a stay operation in order to reproduce the next track.

In view of the above, an object of the present invention is to provide an information recording/reproducing device that can continuously record or reproduce tracks at predetermined locations on a record carrier having a spiral track.

Means for Solving the Problems The present invention provides a disc-shaped recording device having a track for recorded signals or a spiral track for recording the signal, and having a signal indicating one revolution in the track. converting means for reproducing or recording track signals on the carrier;
a detection means for detecting a one-rotation signal from the output signal of the conversion means; a delay means for delaying the output signal of the detection means; a storage means for storing the output signal of the delay means; a moving means for moving in a direction substantially perpendicular to the track direction on the record carrier; and a jumping means for jumping the scanning position of the converting means to an adjacent track; Then, the information recording and reproducing apparatus interpolates the output signal of the detection means based on the output signal of the storage means.

Operation The present invention has the above-described configuration, so that when the one-rotation signal portion of the track on the record carrier drops out due to dust, dirt, scratches, etc. and the detection means does not detect the one-rotation signal,
By interpolating the one-rotation signal based on the output signal of the storage means stored in advance, it is possible to stably perform the stay operation. Therefore, it becomes possible to accurately read and write the contents of the track using the converting means.

Example The present invention will be described in detail below with reference to the drawings.

FIG. 8 shows an example of track jumping according to the present invention, 1
The track 2 consisting of spiral tracks A, B, and C moves from the inner circumference to the outer circumference, and the sector areas 81 to S32'l in which information is recorded are switched.
Index mark area I DM indicating 1 revolution signal)
, sector mark address area SMAD ~S indicating sector marks and track addresses that separate each sector area
MAD32 is a record carrier provided in advance.

3, an optical head is used to track the track of the address signal A while reproducing the track. The optical head 3 reproduces the index mark IDM portion, and as soon as the index mark is detected, the optical head 3 moves at high speed in the inner radial direction of the record carrier 1.

In other words, this is a stay operation pattern in which the tracks at the predetermined location A are continuously reproduced by jumping by an amount equivalent to one track.

FIG. 7 is a block diagram of one embodiment of the above-mentioned jumping control system. The record carrier 1 is rotated by a motor 4. A reproduction signal obtained from the optical head 3 is amplified by a head amplifier 5, demodulated by an address signal reproduction circuit 6, and input to an information processing control device 7.

Further, the output of the head amplifier 5 is input to an index mark detection circuit 8. A position detection element 9 is attached to the motor 4 and detects one pulse signal when the record carrier 1 rotates once, and this output signal is input to the index mark detection circuit 8. The index signal detected by the index mark detection circuit 8 is input to the jumping starting circuit 1o.

When the jumping starting circuit 10 receives the still command signal a from the information processing control device 7, it generates a pulse in synchronization with the index mark signal. This pulse excites the tracking drive coil 12 of the optical head 3 by the optical head drive circuit 11, and moves the light beam output of the optical head 3 by one track in the inner diameter direction of the record carrier 1.

FIG. 1 shows a specific example of the index mark detection circuit 8 shown in FIG. 4 described above. 13 is a pulse width detection circuit for detecting the pulse width of the signal C input from the head amplifier 5 in FIG.
14 is a counter for counting the number of pulses of the output signal of the pulse width detection circuit 13; 15 is a counter for counting the number of pulses of the output signal of the pulse width detection circuit 13;
A counter that counts the pulse width of the output signal of
It is connected to a reset terminal of the counter 14 so that the counter 14 is cleared when the count value exceeds a predetermined value.

Reference numeral 16 denotes a pulse generation circuit that generates pulses based on the output signal of the counter 14. The pulses generated by the pulse generation circuit 16 are input to the delay circuit 17 and simultaneously input to the pulse interpolation circuit 18. The delay circuit 17 delays the input signal, and this delayed output signal is transmitted to the memory 19 and the pulse interpolation circuit 18. Further, the output signal of the pulse interpolation circuit 18 is transmitted to the jumping starting circuit 10 shown in FIG.

2o amplifies the signal e input as a write start command for the memory 19 from the information processing control device 7 shown in FIG. 4 and the output signal d of the position detection element 9 shown in FIG. Memory 1 with the converted signal
The signal is input to the memory 19 through a gate circuit that creates a write signal of 9. The output signal of the comparison circuit 22 is pulse-shaped by the pulse generation circuit 23 and inputted to the reset terminal of the counter 24. The counter 24 counts the clock signal f from the information processing control device 7 in FIG.
It is transmitted to 9.

FIG. 2 shows a specific example of the pulse interpolation circuit 18 shown in FIG. 1 above. 26 is a flip-flop, the signal 1 outputted from the memory 19 in FIG. Also flip flop 2
The Q output of 6 is connected to one side of the NAND circuit 27. The Q output of the flip-flop 26 is connected to the other side of the NAND circuit 27, and the output of the NAND circuit 27 is connected to the reset terminal of the flip-flop 28.

The D terminal of the clip-flop 28 is connected to the power supply VDD, and the output signal q of the pulse generation circuit 16 shown in FIG. 1 is input to the clock terminal C. The Q output of the flip-flop 28 is input to the other of the AND circuit 29, and the A
The output of the ND circuit 29 is sent to one side of the OR circuit 30, and also to the OR circuit 30.
The output signal of the delay circuit 17 shown in FIG. 1 is input to the other side of the circuit 30. The output signal of the OR circuit 30 is the fourth output signal of the index mark detection circuit 8 in FIG.
The signal is transmitted to the jumping starting circuit 1o shown in the figure.

The operation of the information recording/reproducing apparatus of this embodiment configured as described above will be explained below.

In a reproduction state in which the optical head 3 reproduces a signal recorded on the record carrier 1, the information processing control device 7 shown in FIG. 4 first outputs a memory write start command e to the index mark detection circuit 8. Then, the gate circuit 2o transmits the output signal d of the position detection element 9, which generates one pulse when the record carrier 1 rotates once, to the amplifier 21. A logic "1" is output to the memory 19 during the period from the first pulse input through the comparator 22 to the second pulse input. Then, the memory 19 enters a write state and stores the output signal of the delay circuit 17.

Here, a method for detecting index marks will be explained. The optical head 3 scans the index area (ID) of the record carrier 1.
When reproducing M), the signal is reproduced according to the unevenness of the index area, and after being amplified by the head amplifier 6,
The signal is input to the pulse width detection circuit 13 in FIG. The pulse width detection circuit 13 detects the width of the input pulse, and outputs the pulse if it is equal to the pulse width of the index mark.
If they are not equal, no pulse will be output. The pulses generated by the pulse width detection circuit 13 are counted by a counter 14, and when a predetermined number of pulses are continuously input, the counter 14 transmits a signal to the pulse generation circuit 16, and the pulse generation circuit 16 generates an index mark pulse. Occur. When the pulse of the output signal of the pulse width detection circuit 13 is defective, the counter 14 is reset by the output signal of the counter 16. Therefore, the index mark can be detected from the signal reproduced from the record carrier 1.

The signal generated by the pulse generation circuit 16 is delayed by the delay circuit 17 and stored in the memory 19. Therefore, the memory 19 receives the delayed index pulse signal obtained by reproducing the record carrier 1 from the position detection element 9. One rotation of the record carrier 1 is stored in relation to the obtained signal. The operating waveforms of each part at this time are shown in FIG. 3, (a) is the output waveform of the head angle 5 in FIG.
) is the output waveform of the pulse generation circuit 16, (d) is the output waveform of the delay circuit 17, (e) is the output waveform of the amplifier 21, (f
) is the output waveform of the comparator 22, (q) is the pulse generation circuit 2
3) is the output command signal of the information processing control device 7 in FIG. 4, and (i) is the output waveform of the gate circuit 2o.

After being stored in the memory 19 in this way, as shown in FIG. 4C, the index mark (S M 1' in FIG. 4(a)) which is the output signal of the head amplifier 6 in FIG.
If l is defective, the clip-flop 28 is not set and the output Q remains at logic "1n," and the signal i read from the memory 19 in FIG.
．． AND circuit 29. It is output to b via the OR circuit 3o. The operating waveforms of each part at this time are shown in FIG. 4, where (-) is the output waveform of the head amplifier 6 in FIG. 7, (b) is the output waveform of the counter 14 in FIG. 1, and (C) is the pulse generation circuit 16.
output waveform.

(d) is the output waveform of the delay circuit 17, (e) is the waveform 7 in FIG.
The output waveform of the Q terminal of the flip-flop 25, (f) the output waveform of the Q terminal of the flip-flop 28, (q) the NAN
The output signal of the D circuit 27, (h) the output signal of the AND circuit 29, and (i) the output signal of the OR circuit 30.

Therefore, the index signal is interpolated with the signal output from the memory 19 and input to the jumping starting circuit 1o in FIG.

In the above explanation, as shown in FIG. 1, the signal from the pulse generation circuit 16 is delayed by the delay circuit 17 and then stored in the memory 19, and interpolation is performed only when the index signal is defective. As shown in FIG. 1, the signal from the pulse generation circuit 16 is delayed by the delay circuit 17 before being transferred to the memory in order to prevent erroneous interpolation even if the time axis of the index signal reproduced due to vibrations of the record carrier 1 or the optical head 3 changes. 19 and index ・
Although the configuration is configured so that interpolation is performed only when the signal is defective, the delay circuit 17 may be removed if the above-mentioned vibration and time axis fluctuations are not a problem.A block diagram of the configuration is shown in FIG. FIG.

In FIGS. 5 and 6, blocks having the same numbers as those in FIGS. 1 and 2 have the same functions, so explanations will be omitted.

As described above, according to the present embodiment, by providing a memory for storing the index signal, even if the index signal is defective, interpolation is performed, thereby making it possible to stably and reliably perform the stay operation.

As described in detail, according to the present invention, even if the reproduced index signal drops out due to dust, dirt, etc. on the record carrier, it is possible to maintain stable stability with a simple configuration by interpolating with the memorized signal. It works, and the effects are great.

[Brief explanation of the drawing]

FIG. 1 is a concrete block diagram of an index mark detection circuit of an information recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a concrete example of a pulse interpolation circuit, and FIG.
FIG. 4 is an operational waveform chart necessary for the present invention, FIG. 6 is a specific block diagram of an index mark detection circuit of an information recording/reproducing apparatus according to another embodiment of the present invention, and FIG. 6 is a diagram of another embodiment of the present invention. FIG. 7 is a circuit diagram showing a specific example of the pulse interpolation circuit of the information recording and reproducing apparatus of the embodiment, FIG. 7 is a block diagram showing one embodiment of the jumping control system, and FIG. be. 8... Index mark detection circuit, 9...
...Position detection element, 1o...Jumping starting circuit, 12...Tracking drive coil, 1
3... Pulse width detection circuit, 14, 16...
... Counter, 16. River... Pulse generation circuit, 17.
...Delay circuit, 18... mark, pulse interpolation circuit, 1
9...Memory. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 7
Figure/-11 Kiotsu Nurika J Danban 3-11 Light Zero Head 12-11 Tracking Island ε Heavy Coil Figure 8

Claims (1)

[Claims] Conversion means for reproducing or recording a track signal on a disc-shaped record carrier having a track of recorded signals or a spiral track for recording the signal, and having a signal indicating one rotation in the track. a detection means for detecting a one-rotation signal from the output signal of the conversion means; a storage means for storing the output signal of the detection means; and a scanning position of the conversion means approximately perpendicular to the track direction on the record carrier. and a jumping means for jumping the scanning position of the converting means to an adjacent track, and when the output signal of the detecting means is defective, it is detected based on the output signal of the storage means. An information recording and reproducing device characterized in that it is configured to interpolate an output signal of the means.