JP2013134790A - Optical disk device, and readout data transfer method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce occurrence of a timeout related to an acceleration time of a spindle motor when a host device transmits a first readout command to an optical disk device.SOLUTION: In receiving the first readout command, an optical disk device rotates the spindle motor at a low speed to read out data from an optical disk, stores a predetermined amount of the data in a memory and responds to the host device after a standby time of, for example, about 2 seconds has elapsed. The spindle motor is accelerated to a predetermined high speed immediately after the predetermined amount of data is stored in the memory. Thus, even when a second readout command is generated immediately after the host device receives the response, a second response is received in a short time. In any of the readout commands, a problem in which the timeout occurs is reduced.

Description

  The present invention relates to an optical disk device and a read data transfer method of the optical disk device, and more particularly to an optical disk device in which timeout occurrence in a host device during data reading is reduced, and a read data transfer method of the optical disk device.

  In an optical disk apparatus that reads data from a recording medium such as a BD (Blu-ray Disk), a DVD (Digital Versatile Disk), or a CD (Compact Disk), a data read command is received from a host device that controls the data. Needs to send the read data to the host device within a predetermined time. If the host device cannot respond within a predetermined time, the host device assumes that the optical disk device cannot respond as expected, and stops transmission / reception of subsequent commands and data. This is called timeout.

Of course, in the optical disc apparatus, it is necessary to transmit the read data in a short time so as not to cause a timeout.
In Patent Document 1, data reading is started when the rotation speed of the optical disk reaches a first target rotation speed lower than the final target rotation speed during data reproduction, and sequentially until the final target rotation speed is reached. A technique is disclosed in which data reading time is shortened by continuing to read data while increasing the rotational speed.

JP 2006-351509 A

  The above-mentioned timeout occurs due to various factors. In particular, an OS (Operating System) and a boot disk in which a utility program is written are mounted on the optical disk device, and a host device (hereinafter also referred to as a host computer) is started up on the boot disk. In some cases, a timeout is likely to occur. The timeout time of the BIOS (Basic Input / Output System) of the host device is as short as 3.5 seconds, for example. For this reason, there is a problem that a timeout occurs in the first read command transmitted and the host device does not start thereafter.

In the optical disk apparatus, when the first read command is received from the host apparatus after being powered on and activated, first, the spindle motor that rotates the optical disk is rotated and activated, and the eccentricity and eccentric center of gravity of the optical disk are accelerated and accelerated. To detect. When there is no problem with the eccentricity and the eccentric center of gravity and the rotation speed of the spindle motor reaches a predetermined speed, data reading is started and the data is transferred to the host device.
In order to go through these processes, it often takes 3.5 seconds or more from receiving a read command to transferring data. Especially in the recent slim slim drive, the torque of the spindle motor is high. Due to its small size, there is a risk of timeout.

In order to reduce the occurrence of timeout, it is conceivable to start reading data while the spindle motor is accelerating, as described in Japanese Patent Application Laid-Open No. 2004-133620. However, since the optical pickup is often used to detect the eccentricity and the eccentric gravity center of the optical disk, it is difficult to make it compatible with data reading.
It is also conceivable that the first read data is transmitted to the host device when the rotation speed of the spindle motor is low, and the second read data is transmitted after the rotation speed reaches a predetermined speed. However, since the above-described time elapses while the rotation speed is accelerated, there is a problem that a timeout occurs before the second read data is transmitted.
In view of the above problems, an object of the present invention is to provide an optical disc apparatus and a read data transfer method for the optical disc apparatus in which occurrence of timeout in a host device during data reading is reduced.

In order to solve the above problems, the present invention is an optical disc apparatus that reads an information signal from the optical disc in response to a read command that is loaded with an optical disc as a recording medium and is supplied from an external host device,
A spindle motor that rotates the optical disc, a servo unit that rotationally drives the spindle motor, an optical pickup that reads the information signal from the optical disc, and the optical pickup that rotates with the spindle motor in response to the read command. A signal processing unit that processes the information signal read from the optical disk to generate read data, a cache memory that stores a predetermined amount of the read data generated by the signal processing unit, and a data interface with the host device An interface unit, and a control unit that controls the overall operation of the optical disc device;
When the read command is supplied from the host device, the control unit instructs the servo unit to start rotating the spindle motor at a first predetermined speed, and to supply a predetermined amount of the signal processing circuit to the signal processing circuit. Read data is generated and stored in the cache memory, and the servo unit is instructed to accelerate the spindle motor to rotate at a second predetermined speed higher than the first predetermined speed, and a predetermined time has elapsed. After that, when the read data stored in the cache memory is instructed to the interface unit and transferred to the host device, and the read command is supplied again from the host device, the signal processing circuit is provided. Generate a fixed amount of the read data, store it in the cache memory, instruct the interface unit and store it in the cache memory Said read data is characterized by controlling so as to be transferred to the host device.

The present invention also relates to a read data transfer method for an optical disc apparatus in which an optical disc as a recording medium is mounted and rotated by a spindle motor, and an information signal is read from the optical disc in response to a read command supplied from an external host device. ,
A receiving step for receiving the read command from the host device, a rotation starting step for starting rotation of the spindle motor at a first predetermined speed when the read command is received in the receiving step, and a rotation starting step. A reading step for reading the information signal from the read optical disc, a storing step for storing a predetermined amount of read data generated by processing the information signal read in the reading step, and a spindle motor for the first predetermined signal. An acceleration step of accelerating to rotate at a second predetermined speed higher than the speed, and a transfer step of transferring the read data stored in the storing step to the host device after a predetermined time,
When the receiving step receives the read command from the host device again, the read data read again in the reading step and stored again in the storing step is transferred to the host device. .

  According to the present invention, it is possible to provide an optical disc device and a read data transfer method for the optical disc device that reduce the occurrence of timeout in the host device during data reading, and there is an effect that it is possible to contribute to improvement of basic performance of the optical disc device.

1 is a block diagram of an optical disc apparatus in the present embodiment. It is an operation | movement flowchart of the optical disk apparatus and host computer in a general example. It is an operation | movement flowchart of the optical disk apparatus and host computer in a present Example.

Embodiments of the present invention will be described below with reference to the drawings. First, the operation of the entire apparatus will be described with respect to an optical disk apparatus (ODD; Optical Disk Drive).
FIG. 1 is a block diagram of an optical disc apparatus 1 in the present embodiment. An optical disc 101 as a recording medium is, for example, a DVD or a BD. Of course, any of the write-once type that can be recorded only once such as DVD-R and BD-R, the rewritable type such as DVD-RAM and BD-RE, and the read-only type such as DVD-ROM. good. The mounted optical disk 101 is rotationally driven by a spindle motor 105 so as to have a predetermined rotational speed (for example, a rotational speed that provides a predetermined linear speed at a position where data is recorded / reproduced). A spindle motor control signal 115 for that purpose is generated by a servo unit 113 included in a DSP (Digital Signal Processor) 109, power amplified by an amplifier 108, and then supplied to a spindle motor 105. In order for the servo unit 113 to generate the spindle motor control signal 115, a rotation speed detection circuit 106 is provided, and a signal indicating the rotation speed of the spindle motor 105 generated by the rotation speed detection circuit 106 is supplied to the DSP 109. Has been.

The optical pickup 102 irradiates the recording surface of the optical disc 101 with a laser beam through the objective lens 104 to record or reproduce data.
The optical pickup 102 is mounted on a sled mechanism and moves in the radial direction on the optical disc 101 as the sled motor 103 rotates to record and reproduce data at a predetermined track position. The sled motor control signal 118 for this purpose is generated by the servo unit 113, power amplified by the amplifier 108, and supplied to the sled motor 103.
The objective lens 104 is mounted on a tracking actuator 119 and a focus actuator 120 using electromagnetic force (in FIG. 1, 119 and 120 show only directions for driving the objective lens 104 to avoid complication).

  The tracking actuator 119 is supplied with a tracking actuator control signal 116 generated by the servo unit 113 and amplified by the amplifier 108. Based on this, the objective lens 104 correctly traces the laser beam on a predetermined recording track of the optical disc 101. Thus, the position in the radial direction (tracking direction) relative to the optical disc 101 is finely adjusted. Further, the focus actuator 120 is supplied with a focus actuator control signal 117 generated by the servo unit 113 and amplified by the amplifier 108, and based on this, the objective lens 104 causes the laser beam to travel on a predetermined recording track of the optical disk 101. The position in the vertical direction (focus direction) with respect to the optical disc 101 is finely adjusted so as to focus correctly.

  A photodetector 121 included in the optical pickup 102 detects the reflected light from the optical disk 101 of the laser beam, detects an information signal recorded on the optical disk 101, and converts it into an electrical signal. The detected information signal is supplied to the signal processing unit 107. The signal processing unit 107 includes a circuit block called an AFE (Analog Front End) circuit, and the AFE circuit performs processing of the information signal at a stage that should be handled as an analog signal even in digital recording. That is, the signal processing unit 107 performs arithmetic processing on the information signal to generate, for example, a tracking control signal and a focus control signal, and supplies them to the servo unit 113 included in the DSP 109. The servo unit 113 generates tracking and focus servo signals based on the supplied tracking control signal and focus control signal, that is, the previous tracking actuator control signal 116 and the focus actuator control signal 117, and transmits the optical signal via the amplifier 108. This is supplied to the pickup 102 to control the tracking operation and the focusing operation described above.

  The signal processing unit 107 equalizes the frequency characteristics of the amplitude and phase when data is recorded on and reproduced from the optical disc 101, and supplies the equalized data to the decoder unit 112 included in the DSP 109. The decoder unit 112 performs reproduction processing of the information signal recorded on the optical disc 101. For example, a decompression process opposite to the data compression process performed on the information signal before recording on the optical disc 101 is performed, and the original information signal is decoded. The decoded information signal is temporarily stored in the cache memory 114. Note that the signal processing unit 107 and the cache memory 114 may be integrated on the same semiconductor chip as the DSP 109.

  The operation of the optical disc apparatus 1 described above is performed based on a control signal generated by a microcomputer (microcomputer) 111. Note that the microcomputer 111 may also be integrated on the same semiconductor chip as the DSP 109. Hereinafter, the microcomputer 111 may be described as the control unit 111.

  Further, for example, an operation command from the user is generated by the host computer 2 which is a host device of the optical disc apparatus 1. The command signal generated by the host computer 2 is transmitted when an I / F (interface) unit 110 included in the DSP 109 mediates communication between the host device and the optical disc apparatus 1.

The information signal temporarily stored in the cache memory 114 is supplied to the host computer 2 via the I / F unit 110. Conversely, an information signal supplied from the host computer 2 via the I / F unit 110 is temporarily stored in the cache memory 114 and then subjected to a predetermined modulation operation and recording by a recording signal processing circuit included in the signal processing unit 107. Encoding is performed, and further, recording is performed on a recording track of the optical disc 1 through a laser beam generated by the optical pickup 102. Note that an optical disc apparatus having only a signal reproduction function that does not have these signal recording functions is also in the category of this embodiment.
In the above description, the operation has been described by taking an example in which an information signal such as a video signal and an audio signal is compressed, recorded, reproduced, and decompressed. However, when data is recorded and reproduced without being compressed or decompressed. Are also in the category of this embodiment. In this case, for example, the decompression process in the decoder unit 112 is stopped.

Next, consider a case where the host computer 2 issues a read command for reading data written on the optical disc 101 to the optical disc apparatus 1. In particular, when the command is generated, the optical disc apparatus 1 is in a standby state while being supplied with power, and for example, the spindle motor 105 is in a stopped state.
FIG. 2 is an operation flowchart of the optical disc apparatus 1 and the host computer 2 in a general example. An example of an operation flow when a read command is generated in the above situation will be described. As is well known, when data is read from the optical disc 101, the operation of storing a predetermined amount of read data in the memory and then transferring it to the host computer is sequentially repeated until all necessary data is transferred.

In step S201, the host computer 2 issues a read command to the optical disc apparatus 1. The read command is supplied to the control unit 111 via the I / F unit 110 of the optical disc apparatus 1.
Next, in step S202, the control unit 111 instructs the servo unit 113 of the DSP 109 to start rotating the spindle motor 105 that has been stopped, and further accelerates it until it rotates at a predetermined high speed. In the current small-sized optical disc apparatus, it takes about 4 to 5 seconds to reach a predetermined rotation speed. During this time, the above-described eccentricity and eccentric gravity center are detected.

When the spindle motor 105 reaches a predetermined rotational speed, the optical disc apparatus 1 seeks the optical pickup 102 in the radial direction of the optical disc 101 in step S203 and moves it to the position where the data instructed by the read command is written. The data indicated by the read command is read. The data read in step S203 is temporarily stored in the cache memory 114 via the signal processing unit 107 and the DSP 109 in step S204.
When a predetermined amount of data is stored in the cache memory 114 by the read operation in step S203 and the storage operation in step S204, the control unit 111 transmits the stored data via the I / F unit 110 in step S205. The data is transmitted to the host computer 2, and the host computer 2 receives the data.

  The transmission / reception operation is repeated until the host computer 2 receives all necessary data. That is, when the data receiving operation in step S205 is completed, the host computer 2 generates a read command again and supplies it to the optical disc apparatus 1 in step S206. In the previous step S202, the rotation speed of the spindle motor 105 has reached a predetermined speed. Thereafter, as in the previous steps S203 to S205, the optical disc apparatus 1 reads the data in step S207, temporarily stores the data in the cache memory 114 in step S208, and the host computer 2 stores the data in step S209. Repeat the receiving operation.

  However, as described above, for example, the BIOS timeout period of the host computer 2 is as short as 3.5 seconds. As shown in FIG. 2, after 3.5 seconds from the generation of the read command in step S201, the spindle motor 105 may still be accelerating in step S202. After that, for example, even if a predetermined amount of read data is stored in the cache memory 114 in step S204, the host computer 2 has already determined a timeout, and the transmission / reception operation is stopped. Accordingly, the operation flow of FIG. 2 is not completed, and the host computer 2 has a problem that the operation ends without obtaining necessary data.

FIG. 3 is an operation flowchart of the optical disc apparatus 1 and the host computer 2 in the present embodiment. Next, an embodiment in which the above-described problems in FIG. 2 are improved will be described. In FIG. 3, the same step number is attached | subjected about the operation step similar to FIG. The operation flow will be basically described without omitting the same steps as in FIG.
Compared with FIG. 2, FIG. 3 includes a step S301 for rotating the spindle motor 105 of the optical disc apparatus 1 at a low speed, and accordingly, the order of steps S202 and S203 is switched, and the operation of reading data from the cache memory 114 Is different in that step S302 is added to wait for a predetermined time.

In step S201, the host computer 2 issues a read command to the optical disc apparatus 1. The read command is supplied to the control unit 111 via the I / F unit 110 of the optical disc apparatus 1.
In step S301, the control unit 111 instructs the servo unit 113 included in the DSP 109 to rotate and start the stopped spindle motor 105 at a low speed. This rotational speed is much lower than the high rotational speed targeted in step S202 in FIG. 2, for example, about 1/2 to 1/3. For this reason, the rotational speed of the spindle motor 105 reaches a predetermined speed within one second, for example.

When the spindle motor 105 reaches a predetermined rotational speed, the optical disc apparatus 1 seeks the optical pickup 102 in the radial direction of the optical disc 101 in step S203 and moves it to the position where the data instructed by the read command is written. The data indicated by the read command is read. The data read in step S203 is temporarily stored in the cache memory 114 via the signal processing unit 107 and the DSP 109 in step S204.
Note that the operations in step S301 and step S203 can also be performed in the operation at the time of low-speed rotation in the initial stage of the acceleration operation in step S202 of FIG. In this case, the above-described eccentricity and eccentric gravity center are detected after reading data corresponding to step S203.
Next, in step S302, the control unit 111 causes the data stored in the cache memory 114 to wait for a predetermined time, for example, about 2 seconds.

After waiting for a predetermined time in step S302, in step S205, the control unit 111 transmits the data stored in the cache memory 114 to the host computer 2 via the I / F unit 110, and the host computer 2 receives the data. To do.
The time from when the host computer 2 generates a read command in step S201 until it receives read data in step S205 is shortened to about 3 seconds. This is different from FIG. 2 in that step S301 is provided and data is read from the optical disc 101 without waiting for the spindle motor 105 to reach a high rotational speed. Therefore, it is possible to solve the problem that the host computer 2 determines that a time-out occurs because the response of the read data to the first read command is delayed by, for example, 3.5 seconds or more. The purpose of waiting the read data for a predetermined time in step S302 and intentionally delaying the response will be described later.

The transmission / reception operation is repeated again until the host computer 2 receives all necessary data. Therefore, when the data receiving operation in step S205 is completed, the host computer 2 generates a read command again and supplies it to the optical disc apparatus 1 in step S206.
Immediately after the data reading in the previous step S203 is completed, in step S202, the control unit 111 instructs the servo unit 113 included in the DSP 109 to cause the spindle motor 105 that has been rotated at a low speed to move at a predetermined high speed. Accelerate to rotate. Even if it is already rotating at a low speed, it takes about 4 to 5 seconds to reach a predetermined high rotational speed. During this time, the above-described eccentricity and eccentric gravity center are detected.

Accordingly, when the read command generated in step S206 is supplied to the optical disc apparatus 1, the spindle motor 105 may be in the accelerating operation in step S202 as shown in the figure. However, for example, when about 2 seconds elapse, the spindle motor 105 reaches a predetermined rotational speed, so that the optical disc apparatus 1 can start a reading operation according to the reading command in step S207. Furthermore, the data can be temporarily stored in the cache memory 114 in step S208, and the operation in which the host computer 2 receives the data can be repeated in step S209.
The time from when the host computer 2 generates a read command in step S205 until reception of read data in step S209 is, for example, about 2 seconds. This is because the acceleration operation of the spindle motor 105 has already been performed when the read command is generated in step S205. Therefore, it is possible to solve the problem that the host computer 2 determines that a timeout has occurred by delaying the response of the read data to the second read command, for example, by 3.5 seconds or more.

The reason why the standby time of about 2 seconds, for example, is provided in step S302 is to prevent the response of the read data to the second read command from being delayed by, for example, 3.5 seconds or more. If step S302 does not exist, the time from when the host computer 2 generates a read command at step S205 until reception of read data at step S209 is, for example, about 4 seconds, and a timeout occurs. .
Hereinafter, when the third and subsequent read commands are generated, the spindle motor 105 has already been rotated at a predetermined high speed, so there is no possibility that a timeout will occur unless there is a particular abnormality.

As described above, in this embodiment, when the rotation speed of the spindle motor 105 is low in step S301, data for a response to the first read command is read to avoid a timeout, and further, in step S302, the data One feature is that a time-out due to a delay in response to the second read command is avoided by waiting for supply to the host computer 2 for a predetermined time.
Further, since reading of data during the acceleration of the spindle motor 105 is avoided, there is an effect that necessary operations such as the detection of the eccentricity and the eccentric gravity center can be performed.
The embodiments described so far are merely examples, and do not limit the present invention. While different embodiments can be considered based on the spirit of the present invention, all fall within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1: Optical disk apparatus, 2: Host computer, 101: Optical disk, 102: Optical pick-up, 103: Thread motor, 105: Spindle motor, 110: I / F part, 111: Control part, 114: Cache memory

Claims (2)

An optical disc apparatus that reads an information signal from the optical disc in response to a read command that is mounted with an optical disc as a recording medium and is supplied from an external host device,
A spindle motor for rotating the optical disc;
A servo unit that rotationally drives the spindle motor;
An optical pickup for reading the information signal from the optical disc;
A signal processing unit that processes the information signal read from the optical disc by the optical pickup in accordance with the rotation of the spindle motor according to the read command, and generates read data;
A cache memory for storing a predetermined amount of the read data generated by the signal processing unit;
An interface unit for interfacing data with the host device;
A control unit that controls the overall operation of the optical disc device;
When the controller receives the read command from the host device,
Instructing the servo unit to start rotating the spindle motor at a first predetermined speed,
Causing the signal processing circuit to generate a predetermined amount of the read data and storing it in the cache memory;
Instructing the servo unit to accelerate the spindle motor to rotate at a second predetermined speed higher than the first predetermined speed,
After a predetermined time has elapsed, the interface unit is instructed to transfer the read data stored in the cache memory to the host device,
When the read command is supplied again from the host device,
Causing the signal processing circuit to generate a predetermined amount of the read data and storing it in the cache memory;
An optical disc apparatus characterized by instructing the interface unit to transfer the read data stored in the cache memory to the host device. A read data transfer method for an optical disc apparatus, in which an optical disc as a recording medium is mounted and rotated by a spindle motor, and an information signal is read from the optical disc in response to a read command supplied from an external host device,
Receiving the read command from the host device;
A rotation starting step of rotating the spindle motor at a first predetermined speed when the reading command is received in the receiving step;
A reading step of reading the information signal from the optical disc rotated by the rotation starting step;
A storage step for storing a predetermined amount of read data generated by processing the information signal read in the reading step;
An acceleration step of accelerating the spindle motor to rotate at a second predetermined speed higher than the first predetermined speed;
A transfer step of transferring the read data stored in the storage step to the host device after a predetermined time;
When the receiving step is supplied with the read command again from the host device,
A read data transfer method for an optical disc apparatus, wherein the read data read again in the reading step and stored again in the storing step are transferred to the host device.

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