JPS6220142A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To continuously record or reproduce tracks at the prescribed address by counting an output signal to be stored while a recording carrier is making one turn and reporting when the output comes to numerics other than '1'. CONSTITUTION:An information processing controller 7 outputs a memory write start command signal (e) to an index mark detecting circuit 8. A gate circuit 20 outputs a logic '1' to a memory 19, while the 1st and 2nd pulses inputting the output signal (d) of a position detecting element 9 generating one pulse when the recording carrier 1 makes one turn are inputted through an amplifier 21 and a comparator circuit 22. Thus the memory 19 becomes writable, and stores the output signal of a delay circuit 17. When an index mark SM1' being the output signal to a head amplifier 5 is defected, an index signal corrected by a signal outputted from the memory 19 is interpolated and inputted to a jumping activation circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to recording or reproducing information by a signal converting means on a disc-shaped record carrier having a track on which information is recorded or a spiral track for recording information. The present invention relates to an information recording/reproducing device.

2. Description of the Related Art Conventional optical information recording and reproducing devices are disclosed, for example, in Japanese Unexamined Patent Application Publication No. 11547/1982, but recently high-density recording technology has been used to form disks using photosensitive recording materials. By rotating the disk and irradiating it with light from a laser or the like focused on a minute diameter of 1 μm or less, signals can be recorded or reproduced with high density on the disk as changes in irregularities, hole shapes, shading, etc. ing.

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

In addition, the technique for recording the above-mentioned signals is used in an apparatus for producing master discs of video discs.

Also, video signals, audio signals, digital signals, etc. are considered as recording signals.

In the optical recording/reproducing device, signals are recorded by irradiating a recording thin film on the disk with laser light to melt and evaporate the light-irradiated portion of the thin film, or by changing the reflectance or transmittance of the thin film. will be carried out. 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 trunk when cutting the master disc of the optical recording disc, it becomes possible to randomly search any track among 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 advantageous over concentric trunks. This is because the track feed precision of the master cutting machine is that compared to the concentric track that feeds intermittently, the spiral track that feeds continuously is less likely to generate vibrations due to track feed.
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 (hereinafter referred to as an index signal) indicating the rotational position preset on the track in the tracking state, a jumping signal with a predetermined amplitude is applied from the outside to optically record the optical head. The image is taken in the radial direction of the disc, and the brake is applied when the disc leaves the guide track and reaches the next guide track, thereby performing a stay operation in which the previously played track is played back again.

Problems to be Solved by the Invention However, with the above configuration, if the index section previously provided on the track becomes 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 record carrier on which a rotational position signal indicating a rotational position is recorded on a track of recorded signals or a spiral track for recording signals; A rotating means for rotating the record carrier, a signal converting means for playing back or recording by dragging on the record carrier, a detecting means for detecting a rotational position signal from an output signal of the signal converting means, and an output of the detecting means. This information recording and reproducing apparatus has a storage means for storing signals in relation to the rotational position of a record carrier, and a counting means for counting the signals stored in the storage means.

According to the above-described structure, the present invention counts the output signal of the detection means to be stored in the storage means while the record carrier rotates once by the rotation means, and when the output of the counting means becomes other than "1". It was designed to notify the public when the situation occurred.

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

FIG. 9 shows an example of track jumping according to the present invention, 1
Track 2 consisting of spiral tracks A, B, and C extends from the inner circumference to the outer circumference -\, and also in the sector areas S1 to S32. in which information is recorded. Track address switching (1)
index mark area IDM indicating the rotation signal), sector marks separating each sector area, and sector mark address areas 5HAD1 to SMAD indicating the trunk address.
3.degree. is the 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 section,
Immediately upon detecting the index mark, 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 corresponding to one track.

FIG. 8 is a block diagram of one embodiment of the above-mentioned jumping control system. Record carrier 1 is driven by motor 4.

It is rotating. The reproduction signal obtained from the optical head 3 is amplified by the head amplifier 5, demodulated by the address signal reproduction circuit 6, and taken into the information processing control device 7.

Further, the output of the head amplifier 6 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 inputted 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 10.

When the jump starting circuit 1Q receives the stay 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 that counts the number of pulses of the output signal of the pulse width detection circuit 13, and 16 is a pulse width detection -V13.
This counter counts the pulse width of the output signal of the counter 14, and is connected to the reset terminal of the counter 14 so as to clear the counter 14 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.

Reference numeral 20 amplifies the signal e input from the information processing control device 7 in FIG. 8 as a write start command for the memory 19 and the output signal d from the position detection element 9 in FIG. Memory 1 with binarized 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 comparator circuit 22 is input to the reset terminal of the counter 24, which is pulse-shaped by the pulse generating circuit 23, and to the counter 31, respectively. The counter 24 counts the clock signal fi input from the information processing control device 7 shown in FIG. 8, and inputs this count value to the memory 19. The memory 19 uses the signal inputted from the counter 24 as an address value, and stores the signal from the delay circuit 17 based on the command signal from the gate circuit 2o, and transfers the stored signal i from the delay circuit 17 to the pulse interpolation circuit 18 and the counter. 31 respectively.

The counter 31 counts the signals in the memory 19 and transmits the resulting signal j to the information processing control device 7 shown in FIG.

FIG. 2 shows a specific example of the pulse interpolation circuit 18 shown in FIG. 1 above. 25 is a flip-flop whose D terminal receives the signal i output from the memory 19 shown in FIG. Further, the Q output of the flip-flop 25 is connected to one side of the NAND circuit 27. The Q output of the flip-flop 26 is connected to the NAND circuit 27.
The output of the NAND circuit 27 is connected to the reset terminal of the flip-flop 28.

The D terminal of the flip 70 tube 28 is connected to the power supply VDD, and the output signal q of the poll generation circuit 16 shown in FIG. 1 is input to the clock terminal C. The Q output of the flip 70 tube 28 is input to the other of the AND circuit 29, and the A
The output of the I'JD circuit 29 is input to one side of the OR circuit 3o, and the output signal of the delay circuit 17 shown in FIG. 1 is input to the other side of the OR circuit 30. The output signal of the OR circuit 3o is transmitted to the jumping starting circuit 1o of FIG. 8 as the output signal of the index mark detection circuit 8 of FIG.

FIG. 3 shows a specific example of the counter 31 shown in FIG. 1 above.

32 is a 7-lip flop, and the signal 1 read out from the memory 19 in FIG.
The Q output of the flip-flop 34 is connected to the C input terminal of 7, the Q output of the flip-flop 34 is connected to the AND circuit 35, and the Q output of the flip-flop 37 is connected to the AND circuit 3.
5K and the output of AND circuit 35 is flip 70 tube 38
are connected to the C input terminals of each.

The signal R output from the pulse generation circuit 23 in FIG.
are connected to their respective R input terminals.

Further, the signal j of the Q output of the 7-rip 70 knob 38 is connected to the information processing control device 7 shown in FIG. 8, and the C input terminal of the flip 70 knob 34 is connected to the power supply vcoK.

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. 8 first outputs a memory write start command signal e to the index mark detection circuit 8. Gate circuit 2o,
The output signal d of the position detection element 9, which generates one pulse when the record carrier 1 rotates once, is sent to the amplifier 21. A logic "1" is output to the memory 19 during the period from the first pulse input through the comparison circuit 22 to the second pulse input. Then, the memory 19 enters the 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. do. If a 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 so that the index mark can be detected from the signal reproduced from the record carrier 1.

The signal generated by the pulse generating circuit 16 is delayed by the delay circuit 17 and stored in the memory 19.

Therefore, the memory 19 stores the delayed index pulse signal obtained by reproducing the record carrier 1 for one revolution of the record carrier 1 in a relative relationship with the signal obtained from the position detection element 9. become. The operating waveforms of each part at this time are shown in FIG. 4, where (1) is the output waveform of the head amplifier 5 in FIG. 8, (sub) is the output waveform of the counter 14 in FIG. 1, and (3)
is the output waveform of the pulse generation circuit 16, and (4) is the output waveform of the delay circuit 1.
7 output waveform, (5) is the output waveform of amplifier 21, (6)
is the output waveform of the comparison circuit 22, and (7) is the output waveform of the pulse generation circuit 2.
3 is the output waveform, (8) is the output command signal of the information processing control device 7 in FIG. 8, and (9) is the output waveform of the gate circuit 2o.

After being stored in the memory 19 in this way, the index mark S which is the output signal of the head amplifier 5 in FIG.
If M1' is defective, flip-flop 28 is not set and output Q remains at logic "1", and the signal i read from memory 19 of FIG. AND circuit 29. The operating waveforms of each part at this time, which are output to b via the OR circuit 30, are shown in FIG.
1) is the output waveform of the hesodon amplifier 5 in FIG. 8, (2) is the output waveform of the counter 14 in FIG. 1, (3) is the output waveform of the pulse generation circuit 16, (4) is the output waveform of the delay circuit 17,
(6) is the output waveform of the Q terminal of the clip/70 tube 25 in Figure 2, (6) is the output waveform of the Q terminal of the clip/70 tube 28, (7) is the output signal of the NAND circuit 27, (8)
(9) is the output signal of the AND circuit 29, and (9) is 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 1Q in FIG.

In the above explanation, the signal from the pulse generation circuit 16 is transferred to the delay circuit 1.
However, when storing in the memory 19, the dropout of the record carrier 1 causes the pulse width detection circuit 13. counter 14,
15. An index mark is not detected by the index detecting means composed of the pulse generating circuit 16, or the index detecting means is mistakenly detected by the index detecting means 2 due to noise or the like.
If more pulses are detected, accurate stay operation cannot be performed. In order to prevent this, when storing signals in the memory 19 during one revolution of the record carrier 1, it is sufficient to count the signals to be stored, that is, the output signals of the delay circuit 17.

First, to explain the operation in which the index detection means mistakenly detects two pulses, when the memory 19 is stored, the signal of the delay circuit 1A is transmitted through the memory 19 to the T of the Noritsubu frog 32 shown in FIG. being input to the input terminal. The first index mark is detected and the delay circuit 1
7. When inputted to the flip 70 knob 32 via the memory 19, the flip 70 knob 32 is set and the Q output becomes logic "1". If an erroneous second index mark is subsequently detected, delay circuit 17. The signal is input to the flip-flop 32 via the memory 19, and the Q output of the flip-flop 32 changes from logic "1" to "Q", and this signal is input to the T input terminal of the flip-flop 33.

7 Linogphronop 33 has a logic “0” signal at the T input terminal.
When this happens, the Q output is set to logic "1". Since the Q output of the flip-flop 33 is input to the C input terminal of the flip 70 tube 34, the flip-flop 34 changes the Q output from logic "11" to logic "0" at the same time as the C input terminal becomes logic "1". When the Q output of the flip-flop 34 becomes logic "○", the output of the AND circuit 36 becomes logic "0".
Therefore, the AND circuit 35 inputs the logic “◯” to the information processing control device 7.

The motor 4 rotates, the position detection element 9 detects a position signal, and the amplifier 21. Comparison circuit 22. When input to the pulse generation circuit 23, the pulse generation circuit 23 generates a pulse signal R and inputs it to the C input terminal of the flip-flop 37. In the flip-flop 37, the signal input to the C input terminal is logic "1".
Q to latch the level of the D input terminal when the
The output becomes logic "0".

As a result, the signal j of the AND circuit 36 continues to be in the logic "0" state, so the information processing control device 7 detects that it is in an abnormal state. The operation waveform diagram of each part of the above operation is shown in FIG. 4) is the output waveform of Noritub Frog 32, (
6) The output waveform of the 7-rip 70 tube 33, (6) the output waveform of the flip-flop 37, (71 the AND circuit 36)
This is the output waveform of

Next, when storing the signal of the delay circuit 1 in the memory 19, the operation when the index detecting means does not detect the index mark due to dropout will be explained.

When the information processing control device 7 in FIG. 8 outputs a memory write start command e to the gate circuit 20 of the index mark detection circuit 8, the gate circuit 2o outputs the output of the position detection element 9 to the amplifier circuit 21. When input through the comparator circuit 22, a logic "1" is output to the memory 19, and the memory 19 is placed in a writing state. After that, the motor 4 rotates, and the output of the position detection element 9 after one rotation is output to the amplifier circuit 21. Comparison circuit 2
2 to the gate circuit 2o and the pulse generation circuit 23. The gate circuit 2o has a logic “0” in the memory 19.
is output, and the memory 19 stops writing. Moreover, the signal R of the pulse generation circuit 23 is
The flip-flop 37 latches the state of the C input terminal when the C input terminal rises.

Here, since the C input terminal is logic "0", the Q output of the flip-flop 37 is logic "0", and this output is AN
The signal is input to the information processing control device 7 via the D circuit 35.

The operation waveform diagram of each part of the above operation is shown in Fig. 7, (1)
is the signal e inputted from the information processing control device 7 to the gate circuit 20, (2) is the output waveform of the comparison circuit 22, (3) is the output waveform of the pulse generation circuit, (4) is the output waveform of the gate circuit 2o, (sl is the output waveform of the Q output terminal of the flip-flop 37, and (6) is the output waveform of the AND circuit 35.

As explained above, when the logic "0" is manually input to the information processing control device 7 from the AND circuit 35, the information processing type 1" control device 7 detects an abnormality and stops the device or turns on the lamp. or store it in memory again.

As described in detail, according to the present invention, when the reproduced index signal is stored in a memory provided for interpolation when the reproduced index signal is defective due to dust, dirt, etc. on the record carrier, the reproduced index signal is If defective or two or more are detected, an abnormal condition will be notified9.
Alternatively, even if the index signal is defective, it can be accurately interpolated by re-executing the storage in the memory, and the stale operation can be performed more stably, which is very effective.

[Brief explanation of drawings]

FIG. 1 is a 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 specific example of a pulse interpolation circuit, and FIG. 3 is a circuit diagram showing a specific example of a counter. , 4, 6, 6, and 7 are operation waveform diagrams necessary for explaining the present invention, and 8.
The figure is a block diagram showing one embodiment of the jumping control system, and FIG. 9 is a diagram for explaining the track jumping operation. 8... Index mark detection circuit, 9...
...Position detection element, 19...Memory, 2o
...Gate circuit, 23...Pulse generation circuit, 24...Counter, 31...
Counter, 32, 33, 34° 37...Flip-flop, 36...AND circuit, 36...
...Inverter. Name of agent: Patent attorney Toshio Nakao and one other person
笥 'Q'+7th 3rd figure I r -1 -1~----
−−−−−−／−−Ichiki Niunii Dan Isai (3−11 尤↑・Sodo 4−・Motor

Claims (1)

[Claims] a disc-shaped record carrier on which a rotational position signal indicating a rotational position is recorded on a track of recorded signals or a spiral track for recording the signal; a rotation means for rotating this record carrier; a signal converting means for reproducing or recording tracks on the record carrier; a detecting means for detecting a rotational position signal from an output signal of the signal converting means; and a detecting means for associating the output signal of the detecting means with the rotational position of the record carrier. 1. An information recording and reproducing apparatus comprising a storage means for storing signals and a counting means for counting signals stored in the storage means.