JP2002245632A - Optical disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk drive which makes a user feel no stress by immediately restarting reproducing operation which is temporarily stopped. SOLUTION: The reproducing operation is carried on until a buffer RAM 8 becomes full without stopping reading out data recorded on an optical disk 10 even when an indication for stopping the reproducing operation is inputted. Therefore, when an indication for starting the reproducing operation is inputted while the data recorded on the optical disk 10 are continuously read out, the reproduction of data stored in the buffer RAM 8 can immediately be started. The reproducing operation which is temporarily stopped can speedily be restarted and the usability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for reproducing data recorded on an optical disk such as an MD or a DVD.

[0002]

2. Description of the Related Art Conventionally, there has been an optical disk apparatus for reproducing data recorded on an optical disk such as an MD or a DVD. The optical disc records data on tracks formed concentrically or spirally on a recording surface. The optical disk device includes a pickup head that reads data recorded on the track by detecting reflected light of a light beam applied to the track.

A pickup head has a focus mechanism for moving a lens in a direction perpendicular to the recording surface of an optical disk to focus on a track, and a lens in a direction horizontal to the recording surface of the optical disk (radial direction of the optical disk).
And a tracking mechanism for moving the focus to the center of the track.

The optical disk device controls the focus mechanism and the tracking mechanism to read data recorded on the optical disk, and outputs a reproduction signal (a video signal or an audio signal) based on the read data.

[0005]

However, in a conventional general optical disk apparatus, when an input for instructing the stop of the reproducing operation (hereinafter, referred to as a stop input) during a reproducing operation, the focus mechanism, And the control of the tracking mechanism has been terminated. In addition, the rotation of the optical disk also stopped.

On the other hand, the user of the optical disk device may restart the reproducing operation some time after the reproduction operation is stopped. That is, the reproduction operation may be temporarily stopped. For example, the playback operation may be temporarily stopped when a call is received.

[0007] In the conventional optical disk device, upon receiving the stop input as described above, the control of the focus mechanism and the tracking mechanism is immediately terminated. For this reason, even if the playback operation is temporarily stopped, and there is an input for instructing the start (restart) of the playback operation some time after the stop, focus-on for focusing on the track and focusing on the center of the track are performed. The playback operation was started after the track-on operation was performed to match. Therefore, there is a problem in that it takes a long time from the user's instruction to start (restart) the reproduction operation to the output of the reproduction signal by the apparatus main body, which causes the user to feel stress.

Therefore, there is a demand for an optical disk apparatus that can resume a reproduction operation immediately after a user's instruction to start (resume) the reproduction operation is temporarily stopped.

In response to the above-mentioned demand, it has been proposed that the focus mechanism and the tracking mechanism be turned off after a predetermined time has elapsed after the stop input of the reproducing operation has been performed (Japanese Patent Laid-Open Publication No. Hei 3-207064). In this configuration, if the input for instructing the start (restart) of the reproducing operation is performed before the predetermined time elapses, the focus-on and the track-on need not be performed, so that the user starts the reproducing operation. When there is an instruction of (resume), the reproduction operation can be promptly resumed.

However, when there is an input for instructing the start of the reproducing operation, a track jump must be performed to return the pickup head to the next track after the track from which data was last read in the previous reproducing operation. Only the resumption of the reproduction operation is delayed.

It is an object of the present invention to provide an optical disk device that does not cause a user to feel stress by allowing a temporarily stopped reproduction operation to be immediately resumed.

[0012]

An optical disk device according to the present invention has the following arrangement to solve the above-mentioned problems.

(1) A pickup head for reading data recorded on an optical disk, a buffer for storing data read by the pickup head, and a reproducing unit for outputting a reproduction signal based on the data stored in the buffer. In the optical disc device provided with the above, when there is a stop input for instructing the stop of the reproducing operation at the time of the reproduction, the pickup head until the buffer becomes full even after the operation of the reproducing unit is stopped in response to the stop input. And a controller for continuing the operation of reading data recorded on the optical disk and storing the data in the buffer.

With this configuration, data recorded on the optical disk read by the pickup head is stored in the buffer. The reproducing unit outputs a reproduced signal based on the data stored in the buffer.

Even if there is an input for instructing the stop of the reproducing operation, the reading of the data recorded on the optical disk is continued until the buffer becomes full. Therefore, if there is an input for instructing the start (restart) of the reproducing operation before the buffer becomes full, at this time, the pick-up head has already started the next data after the data reproduced last by the previous reproducing operation. The data read from is stored in the buffer. For this reason, the reproduction operation can be restarted by the reproduction unit starting to output a reproduction signal based on the data stored in the buffer. Thus, if the reproduction operation is temporarily stopped, the reproduction operation can be resumed immediately if there is an input for instructing the start (restart) of the reproduction operation, so that the user does not feel stress.

(2) When the buffer becomes full, the control unit causes the pickup head to jump short from the track on the optical disc where data next to the data last stored in the buffer is recorded to this track. The data read by the pickup head is repeatedly performed on the track which can be returned by the above until a predetermined time elapses after the stop input.

In this configuration, even if the buffer becomes full, the reading of the data recorded on the optical disk is not stopped, and the data stored in the buffer last until the predetermined time elapses after the stop input is received. Data reading is repeated from a track on which the next data is recorded to a track on which the pickup head can return to this track by a short jump.

Therefore, before the predetermined time elapses,
If there is an input for instructing the start of the reproducing operation, the reproducing operation can be promptly restarted.

In this case, it is necessary to execute a track jump for returning the pickup head to a track on which data subsequent to the data stored last in the buffer is recorded. However, while the playback unit is outputting a playback signal based on the data already stored in the buffer, the pickup head is returned to the track on which the data next to the data last stored in the buffer is recorded, and If the operation of reading data and storing the data in the buffer can be started, there is no situation in which the data stored in the buffer runs out and the restarted reproduction operation is interrupted.

The short jump referred to here is
This is a jump between tracks without moving the sled on which the pickup head is mounted, and the short jump can be performed in a relatively short time. Therefore, even if the capacity of the buffer is relatively small, there is no possibility that the data stored in the buffer runs out and the restarted reproduction operation is interrupted.

(3) When the buffer becomes full, the control section continues the data reading operation by the pickup head until the data reading from the optical disk is completed.

In this configuration, the operation is continued until reading of data recorded on the optical disk is completed.

In this case, if there is an input for instructing the start of the reproducing operation, when the pickup head is returned to the track on which the data next to the data stored last in the buffer is recorded, a long jump accompanied by a sled movement is performed. It may be. The long jump takes longer time than the short jump described above. However, if the buffer capacity is set to be slightly larger, the data stored in the buffer is lost and the resumed reproduction operation may be interrupted. Never.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk device according to an embodiment of the present invention will be described. FIG. 1 is a block diagram showing a configuration of an optical disk device according to an embodiment of the present invention. The optical disc device 1 of this embodiment is divided into a front end for reading data from the optical disc and a back end for outputting a reproduction signal based on the data read from the optical disc.

First, the configuration of the front end will be described. The front end CPU 2 controls the operation of each unit provided in the front end. The spindle motor 3 is a motor for rotating the optical disc 10 set in the main body. The sled motor 4 is a motor that moves a sled on which the pickup head 5 is placed in a radial direction of the optical disk 7.

The pickup head 5 is provided with a tracking mechanism for moving the objective lens in the radial direction of the optical disk and a focusing mechanism for moving the objective lens in the vertical direction with respect to the optical disk 10. 1
1 to 14 are a spindle motor 3, a thread motor 4,
A driver for the tracking mechanism and the focus mechanism is provided. Reference numeral 15 denotes a servo processor that controls the drivers 11 to 14.

Reference numeral 6 denotes an RF amplifier for amplifying and outputting the output of the pickup head 5. The output of the RF amplifier 6 is supplied to the decoding unit 7 and the servo processor 1
5 is input. The decoding unit 7 decodes a signal input from the RF amplifier 6, that is, data read from the optical disc 10. The data decoded by the decoding unit 7 is stored in the buffer RAM 8.

Next, the configuration of the back end will be described. The back end CPU 21 controls the operation of each unit provided in the back end. 22 is a buffer RAM
8 is an A / V decoder that decodes data stored in the memory 8, that is, data decoded by the decoding unit 9, into a video signal and an audio signal in the order of storage. 23
Is an output unit that outputs a video signal and an audio signal decoded by the A / V decoder 22 as a reproduction signal. 24
Is a working memory used as a working area of the back-end CPU 21. An input unit 25 performs an input operation on the main body. The input unit 25 has a remote control receiving unit that receives a control signal transmitted by infrared rays or radio waves.

A reproduction operation in the optical disk device 1 of this embodiment will be described.

At the time of the reproducing operation, the optical disk 10 set in the optical disk device 1 is rotated by the spindle motor 3. The servo processor 15 controls the focus mechanism and the tracking mechanism based on the output of the pickup head 5 input from the RF amplifier 6. Specifically, based on the input from the RF amplifier 6,
Control for moving the objective lens provided on the pickup head 5 in the vertical direction (perpendicular to the recording surface of the optical disk 10) to focus on a concentric or spiral track formed on the optical disk 10, and The objective lens provided in the pickup head 5 is moved in the radial direction of the optical disk 10 to control the focus on the center of a concentric or spiral track formed on the optical disk 10.

Hereinafter, a state in which the focus mechanism is controlled is called a focus on state, and a state in which the tracking mechanism is controlled is called a track on state.

The decoding section 7 decodes a signal input from the RF amplifier 6, that is, a signal read from the optical disk 10, and outputs the decoded signal to a buffer RAM.
8 sequentially.

The A / V decoder 22 has a buffer R
The data stored in the AM 8 is decoded into a video signal and an audio signal in the order of storage. The output unit 23
The video signal and the audio signal decoded by the / V decoder 22 are output as a reproduction signal. An output device such as a television receiver is connected to the output unit 23, and the output device outputs video and audio based on a reproduction signal input thereto.

In the buffer RAM 8, an area where data output as a reproduction signal from the output unit 23 is stored becomes an empty area, and new data decoded by the decoding unit 7 is stored.

As described above, the front end reads the data stored in the optical disk 10 by the pickup head 5 and stores the read data in the buffer RAM 8, and the back end reads the reproduced signal based on the data stored in the buffer RAM 8. Is output.

Next, during the reproducing operation, the input unit 25
An operation when an instruction to stop the reproduction operation is performed (hereinafter, referred to as a reproduction stop operation) will be described. FIG. 2 is a flowchart showing the reproduction stop operation. In addition,
If there is an input instructing the start of the reproduction operation in the input unit 25 during the reproduction stop operation, the reproduction operation is started by the interruption processing.

When an input for stopping the reproduction operation is made at the input section 25, the optical disk apparatus 1 holds the focus-on state and the track-on state until the buffer RAM 8 becomes full. Reads and stores the read data in buffer RAM 8
(S1 to s3). In the buffer RAM 8,
Data decoded by the decoding unit 7 is stored as in the case of the above-described reproduction operation. At this time, since the A / V decoder 22 is stopped, no reproduced signal is output from the output unit 23.

When the above processes s1 to s3 are being performed, the pickup head 5 moves the buffer RAM 8 from the optical disk 10 to the next data after the data reproduced last in the stopped reproduction operation (previous reproduction operation). The read data is sequentially stored. Therefore, if there is an input for instructing the start (restart) of the reproducing operation at the input section 25 before the buffer RAM 8 becomes full, the data stored in the buffer RAM 8 is immediately transmitted to the A / V decoder 22 at the back end. Let it decode,
A reproduction signal can be output from the output unit 23. That is, when there is an input for instructing the start (restart) of the reproduction operation in the input unit 25, the output device connected to the output unit 23 can immediately output the subsequent video and audio reproduced in the previous reproduction operation. .

At this time, the front end continues the operation of reading data from the optical disk 10 by the pickup head 5. Specifically, the data read from the optical disk 10 is decoded by the decoding unit 7 and the buffer R
It is stored in AM8.

When the buffer RAM 8 is full without input from the input section 25 to instruct the start (restart) of the reproducing operation, the optical disk device 1 performs the following steps s4 to s8.
Execute the processing of In s4, it is determined whether or not a predetermined time has elapsed since the input for instructing the stop of the reproducing operation. At this time, the optical disk device 1 holds the focus-on state and the track-on state, and reads data recorded on the optical disk device 10 (s5, s6). However, the data read from the optical disk 10 in s6 is not stored in the buffer RAM 8. At this time, the decoding unit 7 has stopped.

At s7, it is determined whether or not the position of the pickup head 5 is the limit position at which the data next to the data stored last in the buffer RAM 8 can be returned to the track where the data is recorded by a short jump. If it is determined in s7 that it is at the limit position, the pickup head 5 is determined in s8.
Is returned to the track where the data next to the data last stored in the buffer RAM 8 is recorded, and the process returns to s4. On the other hand, if it is determined at s7 that the position is not the limit position,
The process returns to s4 without executing the process of step 8.

The track jump of the pickup head 5 includes a case where the thread on which the pickup head 5 is mounted is moved as is known, and a case where the thread is not moved. The short jump mentioned here is a track jump that does not move a thread. A jump that moves a thread is called a long jump.
Long jumps take longer than short jumps.

When the input section 25 instructs the start of the reproducing operation during the processing of s4 to s8, the data stored in the buffer RAM 8 is immediately stored in the A / V decoder 22 at the back end. Decoding is performed, and a reproduction signal can be output from the output unit 23. That is, when there is an input for instructing the start (restart) of the reproduction operation in the input unit 25, the output device connected to the output unit 23 can immediately output the subsequent video and audio reproduced in the previous reproduction operation. .

When the front end receives an instruction to start a reproducing operation at the input section 25, the front end returns the pickup head 5 to a track on which data following the data last stored in the buffer RAM 8 is recorded by a short jump. . Then, the operation of reading data from the optical disk 10 by the pickup head 5 and storing the read data in the buffer RAM 8 is started.

As described above, at the front end, before starting the reproducing operation, a track jump is performed to return the pickup head 5 to the track where the data next to the data last stored in the buffer RAM 8 is recorded. You. However, this track jump is a short jump that takes relatively little time. Therefore, even if the storage capacity of the buffer RAM 8 is relatively small, the pickup head 5 can be reliably moved to the buffer RAM 8 while the A / V decoder 22 is decoding the data stored in the buffer RAM 8 at the back end. Then, the operation is returned to the track on which the data next to the data stored in the buffer is recorded, and the operation of storing the data read from the optical disk 10 in the buffer RAM 8 can be started.

As a result, there is no possibility that the data stored in the buffer RAM 8 will be lost and the restarted reproduction operation will be interrupted.

As described above, even after the buffer RAM 8 is full, the input unit 25 allows the input unit 25 to start (restart) the reproduction operation until a predetermined time elapses after the input for instructing the stop of the reproduction operation. If there is an input to instruct, output unit 2
The output device connected to 3 can immediately output the subsequent video and audio reproduced in the previous reproduction operation.

Further, the optical disk device 1 includes an input unit 25
When the predetermined time elapses without an input for instructing the start (restart) of the reproducing operation in step, the data recorded on the optical disk 10 is read while the focus-on state and the track-on state are maintained (s9, s10). However, the data read from the optical disk 10 in s10 is stored in the buffer RAM.
8 is not stored. When there is no input for instructing the start (restart) of the reproducing operation in the input unit 25 and the data stored in the outermost track of the optical disk 7 is read, the focus-on state and the track-on state are released, and the optical disk 10 is released. The rotation is stopped, and the process is terminated (s11 to s13).

If the input section 25 inputs an instruction to start the reproducing operation during the processing of s9 to s11, the data is immediately stored in the buffer RAM 8 in the A / V decoder 22 at the back end. The reproduced data can be output from the output unit 23 by decoding the stored data. That is, when there is an input for instructing the start (restart) of the reproduction operation in the input unit 25, the output device connected to the output unit 23 can immediately output the subsequent video and audio reproduced in the previous reproduction operation. .

When the front end is instructed to start the reproducing operation by the input section 25, the front end returns the pickup head 5 to the track on which the data next to the data stored last in the buffer RAM 8 is recorded. Then, the operation of reading data from the optical disk 10 by the pickup head 5 and storing the read data in the buffer RAM 8 is started.

However, the pickup head 5 is connected to the buffer R
Since the track jump to return to the track on which the data next to the data stored last in the AM 8 is recorded is not always a short jump, the storage capacity of the buffer RAM 8 is reduced in consideration of a long jump. If it is slightly larger, while the A / V decoder 22 is decoding the data stored in the buffer RAM 8 at the back end, it is ensured that the pickup head 5 follows the data stored last in the buffer RAM 8. The operation returns to the track on which the data is recorded, and the operation of storing the data read from the optical disk 10 in the buffer RAM 8 can be started.

As a result, there is no possibility that the data stored in the buffer RAM 8 runs out and the resuming reproduction operation is interrupted.

After the end of the reproduction stop operation (when the main body is in a stopped state), if an input for instructing the start of the reproduction operation is made in the input section 25, the focus is turned on as shown in FIG. , After execution of track-on (s2
1, s22), a track jump is performed to return the pickup head 5 in the buffer RAM 8 to the track where the data next to the data stored last in the buffer RAM 8 is recorded (s23), and then the pickup head 5 moves the optical disk 10 out of the optical disk 10. Then, the operation of reading the data and storing the read data in the buffer RAM 8 is started (s25).

The processes of s21 to s23 take a relatively long time. However, when the capacity of the buffer RAM 8 is increased and the A / V decoder 22
While the data stored in the AM 8 is being decoded, the pickup head 5 is surely returned to the track where the data next to the data last stored in the buffer RAM 8 is recorded, and the data read from the optical disk 10 is read. As long as there is an input for instructing the start of the reproducing operation in the input section 25 as described above, the A / V decoder 22 immediately returns to the back end if the A / V decoder 22 has a size enough to start the operation to be stored in the buffer RAM 8. The data stored in the buffer RAM 8 may be decoded.

After the completion of the focus-on and the track-on in the steps s21 and s22, the A / V decoder 22 stores the buffer RAM 8 in the back end.
May be decoded. In this case, the capacity of the buffer RAM 8 can be reduced, and the cost of the apparatus main body is reduced.

As described above, the optical disc apparatus 1 of this embodiment performs the above-described reproduction stop operation when an instruction to stop the reproduction operation is performed. Therefore, when the reproduction operation is temporarily stopped, In the output device connected to the output unit 23, the subsequent video and audio reproduced in the previous reproduction operation can be output immediately. Therefore, the user does not feel stress.

[0057]

As described above, according to the present invention, if the reproduction operation is temporarily stopped, the reproduction operation can be resumed immediately if there is an input for instructing the start of the reproduction operation. There is no feeling.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing a reproduction stop operation in the optical disc device according to the embodiment of the present invention;

FIG. 3 is a flowchart showing an operation when a reproducing operation is started from a stop state in the optical disc device according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1-optical disk device 2-front-end CPU 5-pickup head 6-RF amplifier 7-decoding unit 8-buffer RAM 10-optical disk 21-back-end CPU 22-A / V decoder 23-output unit 25-input unit

Claims (4)

[Claims] A pickup head for reading data recorded on an optical disk; a buffer for storing data read by the pickup head; a reproducing unit for outputting a reproduction signal based on the data stored in the buffer; In the optical disc device provided with the above, when there is a stop input for instructing the stop of the reproducing operation at the time of reproducing, even after the operation of the reproducing unit is stopped according to the stop input, the pickup head continues to operate until the buffer becomes full. The operation of reading data recorded on the optical disk and storing the data in the buffer is continued, and when the buffer becomes full, the track on the optical disk where the data next to the data last stored in the buffer is recorded, The pickup head can be returned to this track by a short jump The data read by the pickup head is repeated until a predetermined time elapses after the stop input for the track which can be read. Further, after the predetermined time elapses, the data is read by the pickup head until the data read from the optical disc is completed. An optical disc device, comprising: a control unit that continues reading operation of a disc. 2. A pickup head for reading data recorded on an optical disk, a buffer for storing data read by the pickup head, a reproducing unit for outputting a reproduction signal based on the data stored in the buffer, In the optical disc device provided with the above, when there is a stop input for instructing the stop of the reproducing operation at the time of reproducing, even after the operation of the reproducing unit is stopped according to the stop input, the pickup head continues to operate until the buffer becomes full. An optical disc device including a control unit that continues reading data recorded on an optical disc and storing the data in the buffer. 3. When the buffer is full, the control unit causes the pickup head to jump from the track on the optical disc where data next to the data last stored in the buffer is recorded to this track by a short jump. 3. The optical disk device according to claim 2, wherein the reading of data by the pickup head is repeatedly performed on a track that can be returned until a predetermined time elapses after the stop input. 4. The optical disk device according to claim 2, wherein the control unit continues the data reading operation by the pickup head until the reading of the data from the optical disk is completed when the buffer becomes full.