JPH07161043A - Optical disk device - Google Patents

Abstract

PURPOSE:To obtain the optical disk device by which reduced power consumption is realized by intermittent recording and reproduction. CONSTITUTION:When a quantity of contents of a semiconductor memory 10 is full, a standby mode is instructed by a system controller 14, therewith a switch 17 engaged with a power source part 16 is also cut off, and a motor control loop, a head control circuit 4, a modulation/demodulation circuit 8 and a coding/decoding unit 9 are turned off. Thus, low power consumption is realized. On the other hand, when the quantity of contents of the semiconductor memory 10 is decreased below a prescribed value, or disturbance vibration is generated after the lapse of a prescribed time, the power source for the individual constitutive matters is switched on again, therefore the head control circuit 4 is turned on, and a fluctuation of the disk 1 is followed by a recording and reproducing head 2 to suppress the disturbance vibration, so that stable restart against the disturbance vibration is feasible, and the intermittent recording and reproducing can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording and reproducing information such as music signals and image signals on an optical disk.

[0002]

2. Description of the Related Art In recent years, there is a marked tendency for optical disc devices to record a large amount of data on a medium capable of high density recording. In this field, research presentations on high-density recording have been popular in newspapers and the like. However, high-density recording is still in the research stage, and it is easier to compress the amount of data in terms of the practicality of industrialization, and in terms of voice recording, the development of effective compression algorithms in recent years has contributed to various Commercialization has come to be made. The mini disk is its rightmost wing. This so-called "mini disc (hereinafter abbreviated as MD)" is characterized by being smaller and lighter than an uncompressed so-called "compact disc" and is easier to carry than a conventional compact disc player.

A conventional optical disk device will be described below. FIG. 3 shows a schematic block diagram of this conventional optical disk device. In FIG. 3, 41 is recording / reproducing means, 42 is storage means, 43 is processing means, 44 is control means, and 45 is a power supply section.

The operation of the optical disk device configured as described above will be described below.

At the time of recording, the recorded data is written from the processing means 43 to the storage means 42. Next, the recording / reproducing means 41 is read from the storage means 42.
It is recorded on the recording / reproducing medium via. Here, the storage means 42 has a different transfer speed between the recording / reproducing means 41 and the processing means 43, and when converting this, when performing time axis correction such as data rearrangement, and temporarily storing data. By doing so, it is used to improve the earthquake resistance as a backup when the reproduction data from the recording / reproducing medium is temporarily lost due to vibration or the like.
The series of operations just described is performed under the control of the control unit 44, and the power supply unit 45 supplies power to each unit of the present apparatus. On the other hand, at the time of reproduction, the data is reproduced from the recording / reproducing medium by the operation reverse to the above.

[0006]

However, in the above-mentioned conventional structure, although it is excellent in the earthquake resistance, it constantly consumes the electric power for ensuring the earthquake resistance even in the use condition where the vibration does not occur. In the case of a device for use, it is necessary to incorporate a battery as a power supply unit, and there is a problem that long-time operation of the battery cannot be guaranteed.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an optical disk device capable of effectively using a power source while coping with both reduction of power consumption and improvement of earthquake resistance.

[0008]

In order to achieve this object, an optical disk device of the present invention is provided with a data transfer speed a and a processing means for processing data in a recording / reproducing means for recording data on or reproducing data from the optical disk. There is a relation of a> b in the data transfer speed b in the above, and the control means for controlling the recording / reproducing means, the processing means, and the storing means constitutes a device for continuously processing and recording or reproducing data in time. At this time, even if the processing means is in continuous operation, the recording / reproducing means makes the operation intermittently intermittent, and during the operation stop period, at least one of voltage, current, control signal and system clock to the recording / reproducing means. It has a first operating state in which the supply is stopped and a second operating state in which it is not stopped during the operating period. The recording / reproducing head that follows the information track of the optical disc, the vibration detecting means that engages with the recording / reproducing head, and detects the vibration from the outside. The relative position error between the light beam emitted from the head and the information track is detected from the output of the upper recording / reproducing head, and the position of the upper recording / reproducing head is substantially changed to change the upper recording / reproducing head to the fluctuation of the optical disc. And a recording / reproducing head control means for tracking the time, and a timer means for measuring time in the first operation state.
In the operating state of, the device is returned to the second operating state according to the output of the timer means and the output of the vibration detecting means.

[0009]

According to the present invention, with the above structure, the capacity of the storage means is increased to provide the first operating state which is a low power consumption state capable of long-term operation and the high earthquake-resistant state which is strong against vibration. The second operation state can be selected, and the advantages of both operation states can be obtained in a well-balanced manner. Also, by detecting disturbance vibration,
By turning on the power of the device in advance, the earthquake resistance can be further improved.

[0010]

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

FIG. 1 is a block diagram of an optical disk device according to the first embodiment of the present invention. In FIG. 1, the optical disk 1 is recordable and reproducible, and recorded and reproduced by a recording / reproducing head 2. This recording / playback operation is performed by the head amplifier 3
Is directly controlled by. Incidentally, the MD has a magnetic head (not shown), and at the time of recording, it is heated to the Curie point of the base material of the optical disc 1 at the time of recording, and the magnetic field generated by this magnetic head is modulated by a recorded signal for recording. is doing.

On the other hand, the head amplifier 3 irradiates the recording / reproducing head 2 with a focus error which is an error in the focal length between the recording / reproducing head 2 and the optical disk 1, an information track (not shown) recorded on the optical disk 1. A tracking error which is a relative position error between the light beams to be detected is detected and sent to the head control circuit 4. The head control circuit 4 performs proportional / integral / derivative operation on these error signals and supplies a drive current to a focus actuator and a tracking actuator (neither shown) engaged with the recording / reproducing head 2. With this, a position feedback loop for the recording / reproducing head 2 is formed, and control is performed to correct the relative position error between the recording / reproducing head 2 and the optical disc 1 to zero.

The output from the head amplifier 3 is sent to the motor control circuit 5 and is ADIP (ADdress In Pregroo) which is address information included in the tracking error signal.
ve) Play the signal. The motor control circuit 5 uses this ADI
A synchronizing signal is extracted from the P signal, a frequency and phase error between the synchronizing signal and a predetermined frequency (for example, a crystal oscillator output) are detected, a proportional / integral calculation is performed, and a motor operation signal Smc is output. This motor operation signal Smc is
It is sent to the motor drive circuit 6 and converted into an electric current to give a drive torque to the motor 7 to change the rotational speed so that the frequency error and the phase error are zero. The optical disc 1, the recording / reproducing head 2, the head amplifier 3, the motor control circuit 5, the motor drive circuit 6, and the motor 7 constitute a motor control loop.

Now, an outline of the configuration and operation of the signal processing system will be described. First, the recording operation will be outlined.

The voice information input from the outside is AD (An
The data is sampled and digitized by the alog to digital) converter 12, data-compressed by the compression / expansion device 11, and sequentially stored in the semiconductor memory 10. The contents of the semiconductor memory 10 are stored in the ACIRC (Advanced Cross
Processing such as Interleave Reed-solomon Code) is performed and the result is sent to the modulator / demodulator 8. In the modulator / demodulator 8, specifically, 8-14 conversion is performed so that the DC component is not electrically included, a time code or the like is added, and the result is sent to the head amplifier 3. The head amplifier 3 uses the recording / playback head 2 based on this signal.
Recording is performed on the information track of the optical disc 1 by a magnetic head (not shown) that engages with.

Next, the reproducing operation will be outlined. The signal read from the optical disc 1 is sent to the modulator / demodulator 8 via the head amplifier 3. The modulator / demodulator 8 demodulates the aforementioned 8-14 conversion, separates the time code, and sends it to the code decoder 9. The code decoder 9 performs ACIRC decoding and the like and inputs it to the semiconductor memory 10. The data stored in the semiconductor memory 10 must be expanded because it is compressed. This decompression requires a large amount of data, and the transfer rate for reading from the optical disc 1 is considerably higher than the output transfer rate (in the case of a mini disc, it is between the code decoder 9 and the semiconductor memory 10). The transfer rate is 1.4 megabits / second, the transfer rate between the semiconductor memory 10 and the compression / expansion device 11 is 0.3 megabits / second), and the capacity of the semiconductor memory 10 must be stored once. Then, the semiconductor memory 10
However, the tracking control loop is set in the standby mode until the amount of data is reduced to a predetermined amount, and the reading of data is prohibited. The operation at the time of prohibition will be described in detail later. The compression / expansion device 11 reads out the contents of the semiconductor memory 10,
It is expanded and sent to a DA (Digital to Analog) converter 12. The DA converter 12 converts this numerical data into a voltage signal and outputs it to the outside of the device.

In this embodiment, the system controller 14, the input section 15, the power source section 1 are provided as other constituent circuits.
6, a switch 17, an acceleration sensor 18, a comparator 19 and a timer circuit 20. The details of these functions will be described later.

The operation of the optical disk device of the present embodiment having the above-described structure will be described below in detail, particularly about the intermittent operation including the standby mode.

The semiconductor memory 1 having a large capacity as described above.
In order to convert the transfer rate via 0, intermittent operation is indispensable. This intermittent operation will be described with reference to FIG.

The optical disk apparatus of the present invention is provided with two modes: a follow-up mode for reading an information signal from the optical disk 1 and a standby mode for turning off unnecessary constituent elements of the apparatus. This 2
The two modes are distinguished by the power on / off command So output from the system controller 14.

In the standby mode, the switch 17 directly connected to the power supply unit 16 is opened to turn off the tracking control loop, the modulator / demodulator 8 and the code decoder 9. At the same time, the timer circuit 20 is triggered by the power on / off command So.

By simply turning off the power, the tracking control loop is disturbed by disturbance vibration, which is not preferable. In particular, when the tracking actuator is freely vibrated due to vibration, if the vibration remains at the time of restart, it takes an unnecessary time to re-engage, and in the worst case, the semiconductor memory 10 becomes empty. However, there is a problem in that tracking control cannot be pulled in successfully. To solve the problem, in the present invention, the acceleration sensor 18 is utilized even in the standby mode, and the disturbance vibration of a predetermined value or more is detected by the comparator 19. In this way, the quick way is to activate the tracking control loop to suppress the earthquake.

That is, the comparator 19 detects that the acceleration detection signal Sa, which is the output of the acceleration sensor 18, exceeds a predetermined value, and sends the vibration detection signal Sad to the system controller 14. Upon receiving this vibration detection signal Sad, the system controller 14 causes the timer circuit 2
0, if the output St of the timer circuit 20 is low (that is, if a predetermined time has passed after entering the standby mode), the switch 17 that has been turned off is turned on again to supply power to the tracking control loop. To supply. As a result, the tracking actuator generates a force in the direction of suppressing the disturbance vibration, and prevents unnecessary free vibration from occurring.

As described above, according to this embodiment, the acceleration sensor 18 for detecting the disturbance vibration is provided, whereby the power supply is turned on at the time of the disturbance vibration and unnecessary free vibration due to the disturbance vibration can be suppressed.

In this embodiment, the output of the power supply section 16 is cut off by the switch 17, but the same effect can be obtained even if the system clock is cut off in the case of a digital circuit. Further, the current source may be stopped, the control signal may be cut off, or turned on / off.

Further, in the above embodiment, the modulator / demodulator 8 and the code decoder 9 are turned on together with the servo circuit. However, only the servo circuit may be turned on during the standby mode.

[0027]

As described above, according to the present invention, a> b at the data transfer rate a in the recording / reproducing means for recording data on the optical disk or for reproducing the data from the optical disk and the data transfer rate b in the processing means for processing the data. There is a relation, and when the control means for controlling the recording / reproducing means, the processing means, and the storage means constitutes an apparatus for continuously processing and recording or reproducing data in time, even if the processing means is a continuous operation. The recording / reproducing means temporarily makes the operation intermittent, and during the operation stop period, the first operation state in which at least one supply of voltage, current, control signal and system clock to the recording / reproducing means is stopped, and during the operation period, In the first operating state, the second operating state in which the operation is not stopped and the second operating state By returning the operating state, it is possible to realize high-speed restarted from the low power consumption and standby mode of the apparatus.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a waveform diagram for explaining the operation of the optical disc device in the same embodiment.

FIG. 3 is a block diagram showing a configuration of an optical disc device in a conventional example.

[Explanation of symbols]

 1 optical disk 2 recording / reproducing head 3 head amplifier 4 head control circuit 5 motor control circuit 6 motor drive circuit 7 motor 8 modulator / demodulator 9 code decoder 10 semiconductor memory 11 compression / expansion device 12 AD and DA converter 13 memory controller 14 system controller 15 Input unit 16 Power supply unit 17 Switch 18 Acceleration sensor 19 Comparator 20 Timer circuit

Claims (1)

[Claims] 1. The recording / reproducing means has a relationship of a> b in a data transfer rate a in a recording / reproducing means for recording data on or reproducing data from an optical disk and a data transfer rate b in a processing means for processing data. In constructing a device for processing and recording or reproducing data continuously in time by the control means for controlling the processing means and the storage means, the recording / reproducing means is A first operation state in which the operation is temporarily intermittently performed, and at least one of the voltage, current, control signal, and system clock is stopped from being supplied to the recording / reproducing means in the operation stop period, and a second operation state in which the operation is not stopped. And an optical disc device in which the control means can select one of the two operating states. Recording / reproducing head that follows the above information track, vibration detecting means that engages with this recording / reproducing head and detects external vibration, and the relative distance between the light beam emitted from the upper recording / reproducing head and the above information track. A recording / reproducing head control means for detecting a position error from the output of the upper recording / reproducing head and substantially changing the position of the upper recording / reproducing head so as to cause the upper recording / reproducing head to follow the fluctuation of the optical disc. Timer means for measuring time in an operating state, wherein the control means controls the device according to the output of the timer means and the output of the vibration detecting means when the device is in the first operating state. An optical disk device, which is returned to the second operation state.