JPH0772985B2 - Information recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to recording or reproducing information by a signal converting means on a disk-shaped record carrier having a track on which information is recorded or a spiral track for recording. Information recording / reproducing apparatus.

2. Description of the Related Art Recently, as a high-density recording technology, a disk is formed by using a photosensitive recording material, the disk is rotated, and the light of a laser or the like is focused on the small diameter of 1 μmφ or less to irradiate the disk. Signals are recorded or reproduced with high density on the disc as irregularities, holes, or changes in shading.

For example, an optical video disc is well known as a device for reproducing a high-density recorded signal in advance in the above techniques.

Further, in the apparatus for making a master disc of a video disc, the above technique for recording the signal is used.

Further, as the target of the recording signal, a video signal, an audio signal, a digital signal, etc. are considered.

In the optical recording / reproducing apparatus, a signal is recorded by irradiating a recording thin film on the disk with a laser beam to melt and evaporate a light irradiation portion of the thin film or change a reflectance or a transmittance of the thin film. Is performed. That is, it is common practice to use the energy of laser light thermally to change the optical characteristics of the recording material.

In order to perform high track density recording on the optical recording disk, a guide track having a groove structure is provided in advance, and a signal is recorded while performing tracking control on the guide track. The guide track reduces the positional deviation of the recording light beam due to the vibration of the device, and enables signal recording to any place on the optical recording disk.

Further, by recording an address peculiar to each track at the time of cutting the master disc of the optical recording disc, it becomes possible to randomly search any of all tracks of the optical recording disc.

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

In terms of track density, spiral tracks are more advantageous than concentric tracks in this track configuration. Compared to the concentric circular track where the master disc cutting machine feeds intermittently, the continuous feed spiral track does not generate vibration associated with the track feed,
Moreover, it is because the play of the feed screw mechanism is less affected.

However, unlike a concentric track in a spiral track optical recording disc, since it is one continuous track on the optical recording disc, it is possible to keep the optical head on the track of a predetermined address compared to the concentric track. It's difficult to do. In order to concentrically track tracks at the same address of the spiral track, it is necessary to forcibly skip the aperture light of the optical head to one track. At this time, when the optical head detects a signal (hereinafter referred to as an index signal) indicating one rotation, which is provided in advance in the track in the tracking state, a jumping signal having a predetermined amplitude is applied from the outside, and the optical recording disk It was shaken in the radial direction, and the brake was applied at the time when the guide track was disengaged from the guide track and the next guide track was applied.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, when the index portion previously provided on the track is scratched or soiled,
The reproduced signal causes dropout and does not detect the index signal. Then, since the track has a spiral shape, the optical head reproduces the next track, so that the still operation becomes impossible.

In view of the above point, the present invention has an object to provide an information recording / reproducing apparatus capable of continuously recording or reproducing a track of a predetermined address on a record carrier having a spiral track.

SUMMARY OF THE INVENTION The present invention provides a signal on a disc-shaped record carrier having a recorded signal or a spiral track for recording the signal and a signal indicating one revolution in the track. Converting means for reproducing or recording data, rotating means for rotating the record carrier, rotational position detecting means for detecting one rotation of the rotating means, and detection for detecting a signal indicating one rotation from the output signal of the converting means. Means, storage means for storing the detection timing of the signal indicating the one rotation in synchronization with one rotation of the rotation means, and reading a signal previously stored in the storage means in synchronization with one rotation of the rotation means. However, an adding means for adding this signal and a signal indicating one rotation detected by the detecting means and a jumper for jumping the scanning position of the converting means to an adjacent track. The jumping means starts the jumping to the adjacent track by the signal of the adding means, and the converting means is always located in one track even if the signal indicating one rotation is defective. The information recording / reproducing apparatus is characterized by being configured as described above.

The present invention has the above-described structure, and when the one-rotation signal portion of the track on the record carrier causes dropout due to dust, dirt, scratches, etc., and the detection means does not detect the one-rotation signal,
A still operation can be stably performed by interpolating one rotation signal based on the output signal of the storage means stored in advance. Therefore, the contents of the track can be accurately read and written by the conversion means.

EXAMPLES 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.
Is a sector area where the track 2 consisting of spiral tracks A, B, C records information from the inner circumference to the outer circumference.
S _{1 to} S ₃₂ , index mark area IDM indicating switching of track address (one rotation signal), sector mark for separating each sector area and sector mark address area SMAD _{1 to} SMAD ₃₂ indicating track address are provided in advance. Record carrier.

An optical head 3 reproduces a track of the address signal A while tracking the track. As soon as the optical head 3 reproduces the index mark IDM portion and the index mark is detected, the optical head 3 moves at high speed in the inner diameter direction of the record carrier 1. That is, it is a pattern of a still operation in which jumping is performed by an amount corresponding to one track and the track at the predetermined address A is continuously reproduced.

FIG. 7 is a block diagram of an embodiment of the jumping control system described above. The record carrier 1 is rotated by a motor 4. 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.

The output of the head amplifier 5 is input to the index mark detection circuit 8. A position detecting element 9 is attached to the motor 4 and detects one pulse signal when the record carrier 1 makes one revolution. This output signal is inputted to the index mark detecting circuit 8. The index signal b detected by the index mark detecting circuit 8 is input to the jumping starting circuit 10.

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

FIG. 1 shows a specific example of the index mark detection circuit 8 shown in FIG. 13 is a pulse width detection circuit for detecting the pulse width of the signal c input from the head amplifier 5 in FIG.
Is a counter that counts the number of pulses of the output signal of the pulse width detection circuit 13, 15 is a counter that counts the pulse width of the output signal of the pulse width detection circuit 13, and clears the counter 14 when the count value exceeds a predetermined value. It is connected to the reset terminal of counter 14.

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

Reference numeral 20 denotes a signal e input as a write start command for the memory 19 from the information processing control device 7 in FIG. 7 and an output signal d from the position detecting element 9 in FIG. It is input to the memory 19 by a gate circuit that creates a write signal for the memory 19 with the binarized signal. The output signal of the comparison circuit 22 is input to the reset terminal of the counter 24 which is pulse-shaped by the pulse generation circuit 23. The counter 24 counts the clock signal f from the information processing control device 7 shown in FIG. 4, and transmits this count value to the memory 19 as an address of the memory 19.

FIG. 2 shows a concrete example of the pulse interpolation circuit 18 shown in FIG. Reference numeral 25 is a flip-flop, the signal i output from the memory 19 of FIG. 1 is input to the D terminal, and the Q output is transmitted to the D terminal of the flip-flop 26 and one of the AND circuits 29, respectively. The output of flip-flop 25 is
It is connected to one side of the NAND circuit 27. flip flop
The Q output of 26 is connected to the other side of the NAND circuit 27, and the NAND circuit 27
The output of is connected to the reset terminal of flip-flop 28. The D terminal of the flip-flop 28 is connected to the power supply VDD, and the output signal g of the pulse generating circuit 16 of FIG. 1 is input to the clock terminal C. The output of the flip-flop 28 is input to the other of the AND circuits 29,
The output of 29 is input to one of the OR circuits 30, and the output signal h of the delay circuit 17 of FIG. OR
The output signal b of the circuit 30 is used as the output signal of the index mark detection circuit 8 of FIG. 1 and the jumping start circuit of FIG.
Has been transmitted to 10.

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

In the reproduction state in which the signal recorded on the record carrier 1 is reproduced by the optical head 3, the information processing control device 7 of FIG. 7 first outputs a memory writing start command e to the index mark detection circuit 8. Then the gate circuit 20
The output signal d of the position detecting element 9 which generates one pulse when the record carrier 1 makes one rotation is stored in the memory while the first pulse to the second pulse input via the amplifier 21 and the comparator 22 are input. Outputs logic “1” to 19. Then, the memory 19 enters the writing state and stores the output signal of the delay circuit 17.

Here, a method of detecting the index mark will be described. The optical head 3 has an index area (ID
When M) is reproduced, the signal is reproduced according to the unevenness of the index area, and after being amplified by the head amplifier 5,
FIG. 1 is input to the pulse width detection circuit 13. The pulse width detection circuit 13 detects the width of the input pulse and outputs a pulse if it is equal to the pulse width of the index mark, and does not output a pulse if it is not equal. The pulse generated by the pulse width detection circuit 13 is counted by the counter 14, and the counter 14 transmits a signal to the pulse generation circuit 16 when a predetermined number of pulses are continuously input, and the pulse generation circuit 16 generates an index mark pulse. To do. 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 15. 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 relates the signal obtained by reproducing the record carrier 1 by delaying the index pulse and the signal obtained from the position detecting element 9 so that
The amount of rotation will be stored. The operation waveforms of the respective parts at this time are shown in FIG. 3, where (a) is the output waveform of the head amplifier 5 in FIG. 4, (b) is the output waveform of the counter 14 in FIG. 1, and (c) is the pulse generation circuit 16 in FIG. Output waveform, (d) output waveform of delay circuit 17, (e) output waveform of amplifier 21, (f) comparator
22 output waveform, (g) the pulse generator 23 output waveform,
(H) is an output command signal of the information processing control device 7 in FIG. 7,
(I) is an output waveform of the gate circuit 20.

After being stored in the memory 19 in this way, if the index mark {IDM 'in FIG. 4 (a)} which is the output signal of the head amplifier 5 in FIG. 7 is defective as shown in FIG. 4 (a). , The flip-flop 28 is not set and the output remains the logic "1", and the signal i read from the memory 19 of FIG.
It is output to b via the R circuit 30. The operation waveforms of the respective parts at this time are shown in FIG. 4, and (a) is the head amplifier 5 of FIG.
Output waveform, (b) is the output waveform of the counter 14 in Fig. 1,
(C) is the output waveform of the pulse generation circuit 16, (d) is the output waveform of the delay circuit 17, (e) is the flip-flop 25 of FIG.
Output waveform of the Q terminal, (f) output waveform of the terminal of the flip-flop 28, (g) output signal of the NAND circuit 27,
(H) is an output signal of the AND circuit 29, and (i) is an output signal of the R circuit 30.

Therefore, the jumper starting circuit 10 shown in FIG.
It means that the index signal is interpolated by the output signal and input.

In the above description, as shown in FIG. 1, the signal of the pulse generating circuit 16 is delayed by the delay circuit 17 and then stored in the memory 19,
Since the interpolation is performed only when the index signal is defective,
Rotational fluctuation of the motor 4 in the figure, the record carrier 1 or the optical head 3
Even if the time axis of the index signal reproduced due to vibration of the
The signal of the pulse generation circuit 16 is delayed by the delay circuit 17 and then stored in the memory 19, and the interpolation is performed only when the index signal is defective.However, when the above vibration and time axis fluctuation do not pose a problem, the delay circuit 17 FIG. 5 and FIG. 6 show block diagrams of the configuration in which the above may be removed.

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

As described above, according to the present embodiment, by providing the memory for storing the index signal, even if the index signal is defective, the still operation can be stably and reliably performed by interpolating.

EFFECTS OF THE INVENTION As described above, according to the present invention, even if a reproduced index signal causes dropout due to dust, dirt, etc. on a record carrier, by interpolating with a signal stored in memory, a stable and stable configuration is achieved. Still movement can be performed, and the effect is great.

[Brief description of drawings]

FIG. 1 is a concrete block diagram of an index mark detection circuit of an information recording / reproducing apparatus of an embodiment of the present invention, FIG. 2 is a circuit diagram showing a concrete example of a pulse interpolation circuit, FIG.
4 is an operation waveform diagram necessary for the present invention, FIG. 5 is a concrete block diagram of an index mark detection circuit of an information recording / reproducing apparatus of another embodiment of the present invention, and FIG. 6 is another of the present invention. FIG. 7 is a circuit diagram showing a specific example of a pulse interpolation circuit of the information recording / reproducing apparatus of the embodiment, FIG. 7 is a block diagram showing one embodiment of a jumping control system, and FIG. 8 is an operation explanatory diagram of track jumping. 8 ... Index mark detection circuit, 9 ... Position detection element, 10 ... Jumping start circuit, 12 ... Tracking drive coil, 13 ... Pulse width detection circuit, 14, 15 ... Counter, 16 ... Pulse generation circuit , 17 ... Delay circuit, 18 ...
… Pulse interpolation circuit, 19 …… Memory.

Claims (1)

[Claims] 1. A conversion means for reproducing or recording a signal on a disk-shaped record carrier having a signal-recorded or spiral track for recording the signal and a signal indicating one rotation in the track. Rotating means for rotating the record carrier; rotational position detecting means for detecting one rotation of the rotating means; detecting means for detecting a signal indicating one rotation from the output signal of the converting means; A storage unit that stores the detection timing of the signal shown in synchronism with one rotation of the rotation unit, and a signal stored in advance in the storage unit that is read in synchronization with one rotation of the rotation unit. And a jumping means for jumping the scanning position of the converting means to an adjacent track. The jumping means starts the jumping to the adjacent track by the signal of the adding means, and the converting means is always located in one track even if the signal indicating one rotation is defective. An information recording / reproducing apparatus characterized by the above.