JPH0589469A - Optical disk reproducing device - Google Patents

Abstract

PURPOSE:To save power consumption, and to lengthen the life of a battery, etc., by stopping the servo control of disk rotation for a null period, and outputting the drive control signal of a disk discontinuously at every prescribed period. CONSTITUTION:Usual reading operation is executed during the readout of data. Namely, the servo control is activated, and a spindle motor 1 is driven and rotated by a continuous driving signal. At the time of read-out from a laser output control circuit 19 to an optical pickup 2, a laser output value is set lower than at time of the recording, and the saving of the power consumption is attained. At the time of the completion of the read-out, the servo control of the motor l is stopped, and simultaneously, a spindle driving signal is given discontinuously at every period f1, and the motor 1 is driven by inertia. The minimum laser output required for focus servo and tracking servo is given to the pickup 2. This value is made lower than a read-out laser level value. Thus, the power consumption during the void period in which no read-out operation is executed excepting during the read-out of the data can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writable magneto-optical disc reproducing apparatus, and more particularly to a mini disc (hereinafter referred to as M disc).
(Hereinafter abbreviated as D).

[0002]

2. Description of the Related Art A compact disc (hereinafter abbreviated as a CD) has been conventionally known as an optical disc dedicated to reproduction in which acoustic information and various data are recorded, and a CD player is known as a CD reproducing device. .. There are two types of this CD, 12 cm in diameter and 8 cm in diameter, and information of up to about 74 minutes is recorded in the form of a digital signal.

On the other hand, recently, an MD and an MD recording / reproducing device which are magneto-optical discs having a smaller diameter (6.4 cm in diameter) than a CD, a reproduction time equivalent to that of the CD and capable of writing and rewriting information have been developed. ("Nikkei Electronics [Nikkei BP] No. 528 (1991.5.27), No. 1
06 to 107 ", and" Radio Technology [Radio Technology Co., Ltd.] (June 1991), pages 9 to 12 ". ).

This MD is recorded, for example, by compressing the 16-bit data recorded on the CD into 4-bit data.

[0005]

However, the above-mentioned MD recording / reproducing apparatus has been developed aiming at being a small-sized portable type apparatus, and may be used mainly outdoors for reproducing operation. Considered to be many. Therefore, it is desired to prolong the life of a power source such as a battery.

Therefore, it is an object of the present invention to provide an optical disc reproducing apparatus in which power consumption is reduced as a whole.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a disk rotating means for rotating an optical disk on which information is compressed and recorded, and to irradiate the rotating optical disk with a light beam. A reading unit that reads out a predetermined amount of information at a predetermined read time at a predetermined read time and outputs as a predetermined amount of read signal, a storage unit that captures and temporarily stores the predetermined amount of read signal, and is stored in the storage unit. The predetermined amount of the read signal is fetched at a predetermined decode time obtained by adding a predetermined blank time to the predetermined read time, and the information is output by repeating decompression and reproduction of the information by the reverse operation of the compression recording. In the optical disc reproducing apparatus which reproduces the information from the optical disc, the control unit includes the decoding unit and the control unit that integrally controls the units. During time, servo control of the disk rotating means is stopped, and a drive control signal for driving the disk rotating means is discontinuously output at every longest period required for rotation. To be done.

According to a second aspect of the present invention, there is provided a disk rotating means for rotating an optical disk on which information is compressed and recorded, and a light beam is applied to the rotating optical disk to read a predetermined amount of information at a predetermined read time at a predetermined cycle. The reading means for reading out and outputting as a predetermined amount of read signal, the storage means for fetching and temporarily storing the predetermined amount of read signal, and the predetermined amount of read signal stored in the storage means for the predetermined read time. Capture with a predetermined decoding time that is a predetermined blank time added to
An optical disk reproduction for reproducing the information from the optical disk, comprising a decoding means for repeatedly outputting the information by decompressing and reproducing the information by a reverse operation of the compression recording and a control means for integrally controlling the respective means. In the apparatus, the control means is configured to reduce the light irradiation output level of the reading means to the light irradiation output level minimum required for servo control of the reading means during the blank time.

According to a third aspect of the present invention, there is provided a disk rotating means for rotating an optical disk on which information is compressed and recorded, and a light beam is applied to the rotating optical disk to read a predetermined amount of information at a predetermined read time at a predetermined cycle. The reading means for reading out and outputting as a predetermined amount of read signal, the storage means for fetching and temporarily storing the predetermined amount of read signal, and the predetermined amount of read signal stored in the storage means for the predetermined read time. Capture with a predetermined decoding time that is a predetermined blank time added to
An optical disk reproduction for reproducing the information from the optical disk, comprising a decoding means for repeatedly outputting the information by decompressing and reproducing the information by a reverse operation of the compression recording and a control means for integrally controlling the respective means. In the apparatus, the control means is configured to perform pulse irradiation of the light irradiation of the reading means at predetermined intervals necessary for servo control of the reading means during the blank time.

Further, according to the invention of claim 4, a disk rotating means for rotating an optical disk on which information is compressed and recorded, and a light beam is irradiated to the rotating optical disk so that a predetermined amount of information is predetermined every predetermined period. A reading unit that outputs a read signal of a predetermined amount during a read time, a storage unit that captures and temporarily stores the read signal of the predetermined amount, and the read signal of the predetermined amount stored in the storage unit is stored in the predetermined unit. Decoding means for fetching at a predetermined decoding time obtained by adding a predetermined blank time to the reading time, and repeatedly decompressing and reproducing the information by an operation reverse to the compression recording, and decoding means for outputting information, and overall control of each means. An optical disc reproducing apparatus for reproducing the information from the optical disc, the control unit is configured to control the disc rotation during the blank time. A drive control signal for driving the means is discontinuously output at every longest period required for rotation, and a light irradiation output level of the reading means is a minimum light level required for servo control of the reading means. It is configured to reduce the irradiation power level.

[0011]

According to the first aspect of the present invention having the above-mentioned structure, the blank time of the reading means caused by the provision of the storage means for temporarily storing the read information (see FIGS. 3 and 5).
During the period of, the servo control of the disk rotation means is stopped,
Further, during the blank time until the next information reading, the drive control signal, which is the minimum required for the rotation of the motor, is discontinuously output to drive the disk rotating means. With this configuration, it is possible to minimize the power consumption of the disk rotating means during the blank time.

According to the present invention having the above-mentioned structure, the irradiation output level of the reading means during reproduction of the light beam is minimum required for servo control such as focus servo and tracking servo during the blank time. Since it is reduced to the light irradiation output level, the power consumption of the reading unit during the blank time can be minimized.

According to the third aspect of the present invention having the above-mentioned structure, since the light beam emitted from the reading means is pulsed at predetermined intervals necessary for servo control of the reading means during the blank time, the light beam is emitted during the blank time. The power consumption of the reading means can be minimized.

Further, according to the invention of claim 4 having the above-mentioned structure, since the power saving measure of claim 1 and the power saving measure of claim 2 are used together, the synergistic effect of both is as follows.
It is possible to minimize the power consumption of the disk rotating means and the reading means during the blank time.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings. FIG. 1 shows the configuration of an embodiment in which the present invention is disclosed for an MD recording / reproducing apparatus.

The MD 20 has a magneto-optical disk body 21 having a magnetic film and a cartridge 22 for protecting the magneto-optical disk body 21. A guide groove is formed in the magneto-optical disk main body 21, and the guide groove is used for data indicating absolute time information (ATIP: Absolute Time).
It is formed so as to wobble (meander) at a frequency modulated by FM in In Pregroove.

As shown in FIG. 1, this MD recording / reproducing apparatus 100 has a spindle motor 1 for rotationally driving a magneto-optical disk body 21, an actuator (not shown) and a polarization beam splitter, and a rotating magneto-optical disk. The main body 21 is irradiated with a laser beam, and this laser beam causes magnetic K in the magnetic film of the main body 21 of the magneto-optical disk.
The polarization plane is slightly rotated by the err effect, the magneto-optical signal is read from the beam that is reflected and returned, and the RF signal (R
Optical pickup 2 for outputting F: Radio Frequency, and R for amplifying RF signal to an appropriate level
The F amplifier 7, the ATIP decoder 6 capable of detecting the temporal position in the magneto-optical disk main body 31 by detecting the wobbling frequency from the RF signal even when information is not recorded, and the EFM signal (EFM signal (EFM :
EF for extracting Eight to Fourteen Modulation)
An M decoder 9, a magnetic head 3 for applying magnetic field modulation to the position of a magnetic film heated to a Curie temperature or higher by a laser beam to write information, and a head drive circuit 5 for driving the magnetic head 3. DRAM (Dynamic Random Access Memory) for temporarily storing about 1 Mbit of recorded information data and preventing skipping due to vibration
12, a DRAM control circuit 11 for controlling the input / output of data to / from the DRAM 12, and an A / D converter 15 for converting an analog information signal input from the outside during information recording into a digital information signal. And a data compression encoder 13 for compressing the data amount of the digital information signal to about ⅕ by utilizing the minimum audible limit characteristic of human ear and masking effect, and EFM demodulation read from MD 20 at the time of information reproduction. And a data compression decoder 14 for decompressing the reproduced signal and outputting a digital audio signal, and a D / A for converting the restored digital audio signal into an analog signal.
A carriage 16 for moving the converter 16 and the optical pickup 2 in the radial direction of the magneto-optical disk body 21.
A servo control circuit 8 for servo-controlling the spindle motor 1, the carriage 4, and an actuator (not shown), a system controller 10 for controlling each part of the MD recording / reproducing apparatus 100, and an operation command from the outside to the system controller 10. A key input section 18 for giving a key, a display section 17 for displaying a performance state of the MD recording / reproducing apparatus 100, and a laser beam which the optical pickup 2 irradiates the magneto-optical disk body 21 during recording and reproduction. And a laser output control circuit 19 for controlling an electric output (laser output) for each of the above, and these units are connected as illustrated. Here, the spindle motor 1 corresponds to a disc rotating means,
The optical pickup 2 corresponds to a reading unit, the DRAM 12 corresponds to a storage unit, the data compression decoder 14 corresponds to a decoding unit, and the system controller 10, the servo control circuit 8, and the laser output control circuit 19 form a control unit. ing.

With this configuration, the servo control circuit 8 receives the RF signal from the RF amplifier, extracts a control signal for controlling the carriage 4 and an actuator (not shown), and sends the control signal to emit a laser beam. Tracking servo control is performed so as not to deviate from the recording track axis of the magnetic disk body 21. Further, the servo control circuit 8 uses the EFM from the EFM decoder 9.
Spindle servo control is performed by sending a control signal for rotating the spindle motor 1 at a constant speed based on a clock signal included in the signal. The system controller 10 can send a control signal to each part of the player based on an operation command input from the outside to the key input part 18 to perform a high speed search operation, a random access play operation, or the like.

Next, prior to the explanation of the operation of this embodiment, FIG.
The "blank time" during reproduction in the MD recording / reproducing apparatus will be described. The MD has been developed especially for use in a portable compact playback player. Therefore, as shown in FIG. 5, data is read for each predetermined information amount (for example, a data string, ...),
The data is temporarily stored in a DRAM or the like, and the read data is decoded for a time longer than the data read time. This is because MD data is a CD on a small-diameter disc.
This is because the data is compressed to about 1/5 in order to record an average amount of information. Therefore, in an optical pickup or the like for reading data, there is a "blank time" in which it is not necessary to perform the reading operation in addition to the time for reading the data. That is, the difference between the data decoding time and the data reading time becomes the blank time. Since the MD recording / reproducing apparatus is equipped with such a DRAM, even if the optical pickup comes off the recording track due to vibrations when used outdoors, the data is re-recorded within the above blank time. Since it can be read and stored in the RAM, there is an advantage that so-called “sound skip” does not occur.

However, considering the power saving of the MD recording / reproducing apparatus, it is not necessary to drive the spindle motor 1 and irradiate the laser beam of the optical pickup 2 during the blank time as in the data reading time. .. In this embodiment, first, this point is improved. Further, generally, the laser output during reproduction may be lower than the laser output during recording. The present embodiment aims to improve this point as well.

Next, the operation of this embodiment will be described with reference to FIGS. First, a normal data read operation is performed during the data read time (step S1). That is, FIG.
As shown in (c), the spindle servo control is in the closed (ON) state, and the servo control is performed.
As shown in (d), the spindle drive signal is continuously given, and the spindle motor 1 is driven and rotated. Further, as shown in FIG. 3E, the laser output control circuit 19
The laser output level value given to the optical pickup 2 from the above is P ₂ . Here, P ₃ is a laser output level value at the time of recording information, and in general, the laser output level value P ₂ at the time of reading may be lower than P _3. Therefore, in the present embodiment, the laser output level value at the time of reading is P ₂ Set to.
With this setting, power saving can be achieved first when reading data.

Next, when the data reading for one data string is completed (step S2), the power saving operation during the blank time is performed (step S3). That is, as shown in FIG. 3C, the spindle servo control of the spindle motor 1 is opened (OFF) and the servo control is stopped.
At the same time, as shown in FIG. 3D, the spindle drive signal is applied discontinuously in every cycle f ₁ . This cycle f ₁
Is a minimum required period for inertial rotation of the spindle motor 1. By doing so, the spindle motor 1 rotates due to inertia. This cycle changes depending on the drive level of the spindle drive signal.

Further, the magneto-optical pickup 2 has a structure shown in FIG.
As shown in (e), the laser output having the level value P ₁ is given. This value P ₁ is the minimum laser output level required for focus servo control or tracking servo control, and is lower than the read laser output level value P ₂ . Therefore, there is a relationship of P ₁ <P ₂ <P ₃ among the output values P ₁ , P ₂ and P ₃ .

In this way, the power consumption during the blank time is reduced.
Can be lowered. In this case, as shown in FIG.
The laser output level value during the blank time as P₁, Zhou
Period f ₂Alternatively, pulse driving may be used. Cycle f₂Is a focus
Minimum required for tracking servo control, tracking servo control, etc.
Is the cycle of. With this configuration, further power saving
Is possible. It is more effective to use the above power saving measures together
However, either measure is independent
It does not matter if it is executed. When the blank time ends,
S4), and returns to step S1 again to perform a normal read operation.
Becomes

In the above embodiment, the main purpose is to save the power consumption of the power source such as the dry battery, but conversely, it is possible to take a measure to positively request the power source from the outside to generate the power. .. That is, as shown in FIG. 4, a solar cell amorphous sheet or the like may be provided at the position of 24, 25, or 26 on the outer surface of the MD recording / reproducing device 100 to generate electric power from sunlight from the outside.

In the above embodiment, the MD recording / reproducing apparatus has been described, but this may be a reproduction-only MD reproducing apparatus, and further it can be applied to a normal CD reproducing apparatus.

[0027]

As described above, according to the present invention,
It has advantages that power consumption can be saved in a blank time for reading data, a battery or the like can have a long life, and a power-saving optical disk reproducing device that can be used for a long time can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention.

FIG. 4 is a diagram showing an appearance of another embodiment of the present invention.

FIG. 5 is a diagram illustrating a blank time according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... Spindle motor 2 ... Optical pickup 3 ... Magnetic head 4 ... Carriage 5 ... Head drive circuit 6 ... ATIP decoder 7 ... RF amplifier 8 ... Servo control circuit 9 ... EFM decoder 10 ... System controller 11 ... DRAM control circuit 12 ... DRAM 13 ... data compression encoder 14 ... data compression decoder 15 ... A / D converter 16 ... D / A converter 17 ... display section 18 ... key input section 19 ... laser output control circuit 20 ... MD 21 ... magneto-optical disk body 22 ... cartridge 100 ... MD recording / reproducing device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Takahashi 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Izumi Ueda 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Takahiro Okajima 4-2610 Hanazono, Saitama Prefecture Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Hidehiro Ishii 4-2610 Hanazono, Tokorozawa Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Toshihiro Maehara 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Hitoshi Kasama 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant

Claims (4)

[Claims] 1. A disk rotating means for rotating an optical disk on which information is compressed and recorded, and a rotating optical disk is irradiated with a light beam to read a predetermined amount of information at a predetermined read time every predetermined period and read a predetermined amount. A reading unit that outputs as a signal, a storage unit that captures and temporarily stores the predetermined amount of the read signal, and a predetermined blank time for the predetermined read time of the predetermined amount of the read signal stored in the storage unit. Decoding means for outputting the information by repeatedly taking in the added predetermined decoding time and performing expansion / reproduction of the information by the reverse operation of the compression recording, and control means for integrally controlling the respective means, In the optical disc reproducing apparatus for reproducing the information from the optical disc, the control means stops servo control of the disc rotating means during the blank time. And, an optical disc reproducing apparatus and outputting discontinuously at every predetermined period necessary to rotate the drive control signal for driving the disc rotation means. 2. A disk rotating means for rotating an optical disk on which information is compressed and recorded, and a rotating optical disk is irradiated with a light beam to read a predetermined amount of information at a predetermined read time every predetermined cycle and to read a predetermined amount. A reading unit that outputs as a signal, a storage unit that captures and temporarily stores the predetermined amount of the read signal, and a predetermined blank time for the predetermined read time of the predetermined amount of the read signal stored in the storage unit. Decoding means for outputting the information by repeatedly taking in the added predetermined decoding time and performing expansion / reproduction of the information by the reverse operation of the compression recording, and control means for integrally controlling the respective means, In the optical disc reproducing apparatus for reproducing the information from the optical disc, the control means controls the light irradiation output level of the reading means by:
During the blank time, the optical disk reproducing apparatus is characterized in that the light irradiation output level is reduced to a minimum level required for servo control of the reading means. 3. A disk rotating means for rotating an optical disk on which information is compressed and recorded, and a light beam is applied to the rotating optical disk to read a predetermined amount of information at a predetermined read time every predetermined cycle and to read a predetermined amount. A reading unit that outputs as a signal, a storage unit that captures and temporarily stores the predetermined amount of the read signal, and a predetermined blank time for the predetermined read time of the predetermined amount of the read signal stored in the storage unit. Decoding means for outputting the information by repeatedly taking in the added predetermined decoding time and performing expansion / reproduction of the information by the reverse operation of the compression recording, and control means for integrally controlling the respective means, In the optical disc reproducing apparatus for reproducing the information from the optical disc, the control unit controls the light irradiation of the reading unit to be performed by the reading unit during the blank time. Optical disk reproducing apparatus, characterized by pulse irradiation at every predetermined period necessary for the control. 4. A disk rotating means for rotating an optical disk on which information is compressed and recorded, and a rotating optical disk is irradiated with a light beam to read a predetermined amount of information at a predetermined read time every predetermined period and read a predetermined amount. A reading unit that outputs as a signal, a storage unit that captures and temporarily stores the predetermined amount of the read signal, and a predetermined blank time for the predetermined read time of the predetermined amount of the read signal stored in the storage unit. Decoding means for outputting the information by repeatedly taking in the added predetermined decoding time and performing expansion / reproduction of the information by the reverse operation of the compression recording, and control means for integrally controlling the respective means, In the optical disc reproducing apparatus for reproducing the information from the optical disc, the control means drives the disc rotating means during the blank time. A control signal is discontinuously output at every predetermined cycle necessary for rotation, and the light irradiation output level of the reading means is lowered to the light irradiation output level minimum required for servo control of the reading means. A characteristic optical disc reproducing apparatus.