JP2000113500A - Disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate specifying a reproduction start position at the time of time shift recording/reproducing, to decrease a waiting time to a reproduction start, further, to prevent the interruption of recording due to deficiency of disk capacity, and to enable performing stable time shift recording/reproducing without affecting data previously recorded. SOLUTION: This device has a first optical head H1 and a second optical head H2 which can independently record and/or reproduce in an optical disk 1, feeding motors 11, 31 moving independently the first and the second optical head H1, H2 to radius positions on the optical disk 1, and a system controller 5 moving the second optical head H2 to near radius position at which the first optical head H1 starts recording.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording and reproducing apparatus for recording and reproducing video signals and / or audio signals on a disk-shaped recording medium such as an optical disk.

[0002]

2. Description of the Related Art In a conventional optical recording / reproducing apparatus for recording / reproducing a video signal or an audio signal, recording / reproduction is usually performed using a single head. In contrast, Japanese Patent Laid-Open No. 6-162
No. 557, an optical recording apparatus described in
No. 28528, an optical disk device described in
As shown in the optical information processing apparatus and system described in JP-A-205285, there is a technique for simultaneously operating two or more heads on one optical disc. According to the techniques described in these publications, it is possible to improve the access speed, double the data transfer speed or more, and perform continuous recording / reproduction, simultaneous recording / reproduction, and chase reproduction of a plurality of videos.

[0003]

However, in the technology described in these publications, for example, time-shifted recording / reproduction is performed such that information recorded by the first head is shifted by a certain time and reproduced by the second head. If, that is,
When recording is started with the first head, and after a given time elapses, the second head seeks to play back.
The reproduction start position of the second head for performing the chase reproduction must be specified anew, and the waiting time until the start of the chase reproduction has been increased.

[0004] Further, the techniques described in these publications do not disclose any processing when, for example, the remaining capacity of an optical disk is exhausted during time shift recording / reproduction. As described above, if the remaining capacity of the optical disk is exhausted at the time of the time shift recording / reproducing, the recording is interrupted on the way. In addition, when the remaining capacity of the optical disk is exhausted, for example, if it is allowed to overwrite a recorded area without permission, data that should be kept is erased by mistake, which is preferable. Absent.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has been made in consideration of the above-mentioned problems. It is not necessary to specify the start position,
Reduce the waiting time until playback starts, and also prevent recording from being interrupted halfway due to insufficient disk space,
It is an object of the present invention to provide a disk recording / reproducing apparatus that enables stable time-shift recording / reproduction without affecting previously recorded data.

[0006]

In order to solve the above-mentioned problems, a disk recording / reproducing apparatus according to the present invention comprises at least a first and / or a first disk capable of independently recording and / or reproducing on a disk-shaped recording medium. A second two heads, a head moving means for independently moving at least the first and second two heads to respective radial positions on the disk-shaped recording medium, and a first head for moving the disk-shaped recording medium to the disk-shaped recording medium. Control means for immediately moving the second head to a position near the radial position at which the first head has started recording.

In this case, the disk recording / reproducing apparatus according to the present invention includes a recording start position storing means for storing a sector position on the disk-shaped recording medium on which the first head has started recording. A reproduction standby state is set on a track corresponding to a sector position where one head has started recording.

Further, in order to solve the above-mentioned problems, the disk recording / reproducing apparatus according to the present invention has at least first and second two types capable of independently recording and / or reproducing on a disk-shaped recording medium. Heads and at least the first
A head moving means for independently moving the second two heads to a radial position on the disk-shaped recording medium, and a recording start position for storing a recording start position on the disk-shaped recording medium at which the first head has started recording Storage means, head position monitoring means for monitoring at least sector positions of the first and second two heads on the disk-shaped recording medium, and control means for controlling operations of the head moving means and each head; After an elapse of an arbitrary time after the first head starts recording on the disk-shaped recording medium, the second head performs chase reproduction after the first head starts recording from the recording start position. In this case, the first head precedes the second head, and the interval between the second head and the first head is maintained at a predetermined interval.

In this case, the disk recording / reproducing apparatus of the present invention interrupts at least the reproducing operation of the second head if the second head catches up with the recording position of the first head during the follow-up reproducing operation. The input signal is used as an output signal as it is.

In order to solve the above-mentioned problems, a disk recording / reproducing apparatus according to the present invention comprises at least a first and a second recording / reproducing apparatus capable of performing independent recording and / or reproduction on a disk-shaped recording medium. Heads and at least the first
A head moving means for independently moving the second two heads to a radial position on the disk-shaped recording medium, and a recording start position for storing a recording start position on the disk-shaped recording medium at which the first head has started recording Storage means, head position monitoring means for monitoring at least sector positions of the first and second two heads on the disk-shaped recording medium, and control means for controlling operations of the head moving means and each head; After an elapse of an arbitrary time after the first head starts recording on the disk-shaped recording medium, the second head chases and reproduces the data after the first head starts recording from the recording start position. When reaching the final recordable area of the disc-shaped recording medium during recording, the first head tracks the reproduced area from the recording start position to the position where the second head is reproducing. The to.

In this case, in the disk recording / reproducing apparatus of the present invention, during the follow-up recording operation, the second head precedes the first head and the interval between the first head and the second head is set to a predetermined interval. Try to keep. Further, during the chasing recording operation, when the first head approaches a predetermined interval from the reproduction position of the second head, the second head is forcibly set to the normal reproduction operation state. Furthermore, during the chase recording operation,
When the first head approaches a predetermined interval from the reproduction position of the second head, a message for securing a recordable area is generated. The predetermined interval can be set arbitrarily.

Further, during the chase recording operation, the first
When the second head approaches the predetermined interval from the reproduction position of the second head, the second head is forcibly set to the normal reproduction operation state, or a message for securing a recording area is generated. Further, the predetermined interval is set arbitrarily. Still further, the image information at the time of the chase recording operation is displayed until the start of the chase reproduction operation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disk recording / reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows, as an embodiment of a disk recording / reproducing apparatus according to the present invention, an optical disk recording / reproducing apparatus which uses an optical disk 1 as a disk-shaped recording medium and records and reproduces video signals and audio signals on the optical disk 1. An example of a schematic configuration of is shown.

In FIG. 1, the optical disk 1 is chucked by a chucking mechanism 2 and is driven to rotate at a predetermined rotation speed by a spindle motor 3 via a rotating shaft 4. A first optical head H1 and a second optical head H2 are disposed at positions facing each other with the spindle motor 3 interposed therebetween. The spindle motor 3 is driven by a spindle motor drive amplifier 7 controlled by a system controller 5.

As the first optical head H1 and the second optical head H2, heads capable of recording and reproducing data,
Alternatively, one can be a recording-reproducing head and the other a reproducing-only head, or one can be a recording-only head and the other a reproducing-only head. Also, the number of optical heads is 2
Not only the number but also a larger number can be used. Note that, in the present embodiment, in order to simplify the description, the first
The description will be made on the assumption that the optical head H1 is a head capable of recording and reproduction, and the second optical head H2 is a read-only head.

The first optical head H1 and the second optical head H2 can be independently moved in the radial direction of the optical disk 1 by the feed motors 11 and 31, respectively. That is, the system controller 5 controls the feed feed motor drive amplifiers 21 and 37 to control the feed feed motors 11 and 37.
Driving the first and second optical heads H
1 and H2 are independently moved in the radial direction of the optical disk 1.

The positions of the first optical head H1 and the second optical head H2 are respectively monitored by head position monitoring units 22 and 38 provided in correspondence with each other. Positioning is performed according to the command.

As will be described later, the recording start position storage section 6 stores the position at which the first optical head H1 has started recording, and stores the reproduction start position of the second optical head H2 at the time of chasing reproduction. Give to.

The operation input unit 8 includes various operation buttons such as a recording start button, a reproduction start button, a fast forward button, a fast rewind button, a pause button, a stop button, and a chase reproduction button, which will be described later, and is operated by the user. It is. The system controller 5 controls the operation of each unit of the optical disc recording / reproducing device according to the operation information from the operation input unit 8.

In this embodiment, description of functional blocks common to the optical disk recording and reproducing apparatus, such as spindle motor control, laser control, focus and tracking control of the optical head, and input / output data processing control, is omitted. .

An input signal such as a video signal and an audio signal to the first optical head H1 at the time of recording is transmitted through a terminal 13 to A
The signal is sent to a / D (analog / digital) converter 14, and is digitally converted by the A / D converter 14, and then sent to a format converter 15. Format converter 1
In the step 5, the format of the input signal after the A / D conversion is converted into the format for the optical disk, and the signal after the format conversion is sent to the modulator 16. The modulator 16 modulates the signal of the format for the optical disc into a signal suitable for recording on the optical disc, and sends the modulated signal to the first optical head H1. As a result, a signal is recorded on the optical disc 1 by the first optical head H1.

On the other hand, the first optical head H1 during reproduction
Is reproduced and demodulated by a demodulator 17 to be converted back into a digital signal of the original format by a format converter 18, and further converted into an analog video signal by a D / A (digital / analog) converter 19. And audio signals. The analog video signal, the audio signal, and the like are sent as an output signal from the terminal 20 to a monitor device, a speaker, and the like (not shown) at the subsequent stage, and the video and audio are reproduced.

At the time of reproduction, the second optical head H
2 is sent to a demodulator 33 where it is demodulated and converted back into a digital signal of the original format by a format converter 34, and is further converted by a D / A converter 35 into an analog video signal or audio signal. Is converted to The analog video signal, the audio signal, and the like are output to terminal 3 as an output signal.
6 to a monitor device (not shown), a speaker, and the like at the subsequent stage to reproduce video and audio.

Hereinafter, as an example of use of the optical disk recording / reproducing apparatus having the above-described configuration, it is assumed that the optical disk recording / reproducing apparatus is used at home. The operation of the optical disk recording / reproducing apparatus according to the present embodiment will be described with an example of a usage situation in which the program can be recorded from that point and watched later when the program becomes impossible.

In a conventional tape recording / reproducing apparatus such as a video tape recorder, in order to view a recorded program, it is necessary to stop recording once and then rewind and reproduce the tape to a recording start position. For example, as described above, if you want to watch a part recorded while you are standing for some business after completing the business, if you do not want to skip the middle of the program, you can use it for just a few minutes of business. You have to wait for the show to end and then watch it again, wasting time.

On the other hand, as in the optical disk recording / reproducing apparatus of the present embodiment, a disk-shaped recording medium (optical disk 1) is used as a recording medium, and first and second heads which can operate independently of each other. If the (first and second optical heads H1 and H2) are prepared, for example, the first optical head H
When recording is performed on the optical disc 1 by using the first optical head 1, any recording position on the optical disc 1 can be reproduced by the second optical head H1, so that the portion recorded by the first optical head H1 is shifted by a certain time. Then, time-shift recording / reproducing such that reproduction is performed by the second optical head H2, that is, recording is started by the first optical head H1, and after an arbitrary time elapses, is chased by the second optical head H2. Reproduction can be performed. Therefore, for example, as described above, even if a part recorded while standing for some reason is viewed after finishing the task, the end of the program is not skipped without skipping the middle of the program. Can be watched, and true time-shift recording / reproduction becomes possible.

In this case, the second optical head H2 is moved to the recording start position in advance at the position where the recording was started by the first optical head H1, and when the reproduction start instruction is given later, If the reproduction is automatically started from the recording start position, the waiting time from the reproduction start instruction to the reproduction operation can be minimized.

Further, as described above, when a part recorded while standing in a seat for some kind of business is considered to be used for a time-shift recording / reproducing application in which the part is viewed immediately after the business is finished. It is expected that a series of information being recorded by the first optical head H1 is often chased and reproduced by the second optical head H2. Therefore, in many cases, the already reproduced area may be used again for recording. Conceivable.
That is, when recording an important program, it is usual to prepare for the recording in advance, and especially in the case of an accidental recording such as time-shift recording / playback, it is particularly desirable to keep the recording. If there is no reason, it is conceivable that the data is overwritten and erased immediately. Rather, the chase-reproduced (viewed) area is used as the recordable area again because other data recorded before that is used. It is preferable to turning it off.

From the above, in the present embodiment,
In the case where time-shift recording / reproduction is performed, for example, when the remaining capacity of the optical disk is exhausted, the area after the chasing reproduction (viewing) is used again as a recordable area. The recording is prevented from being interrupted halfway, and stable time-shift recording / reproduction can be realized without affecting previously recorded data.

Various operation examples when performing the above-described time-shift recording / reproduction in the optical disk recording / reproduction apparatus of the embodiment of the present invention will be described with reference to the following FIGS.

First, as a first operation example, in a case where a user can do something while watching a television broadcast program and cannot watch the middle of the program, the program is recorded from that point. The operation in the case where the chase reproduction from the recording start position is performed and the recording is continued after the recording is completed will be described with reference to FIG.

In the case where it is impossible to watch the middle of the program due to some errand while watching the television broadcast program, as shown in FIG. When the start button is pressed, at the time when the button is pressed, the system controller 5
A recordable area on the optical disk 1 is searched, and the feed motor driving amplifier 21 is controlled to control the feed motor 1.
1 to move the first optical head H1 to the recordable area.

At this time, video and audio signals of the current television broadcast program are supplied to the terminal 13, and these signals are transmitted via the A / D converter 14, the format converter 15, and the modulator 16. The light is sent to the first optical head H1.

As a result, the time t1
Recording of the video and audio of the subsequent television broadcast program is started. In the example of FIG. 2, the optical head H1
5 shows a case where the address of the recording start position on the optical disk 1 when the recording was started was "0001". Here, the address refers to a sector (or track) address on the optical disc 1.

When recording on the optical disc 1 is started, the head position monitoring unit 22 sends the address "0001" of the recording start position to the recording start position storage unit 6. This recording start position address "0001"
Is stored in the recording start position storage unit 6 and also sent to the system controller 5. The system controller 5 drives the feed motor 31 by controlling the feed motor drive amplifier 37 based on the address "0001" of the recording start position, and moves the second optical head H2 to the vicinity of the recording start position. Move the address further
The playback standby state is set on the 0001 "track.

Next, for example, when the user returns to his seat after completing his business and wants to watch the continuation of the television broadcast program, the user presses the chase playback button on the operation input unit 8.

If, for example, the chase play button of the operation input unit 8 is pressed at time t2, the system controller 5 sets the address "
The second optical head H2, which has been in the reproduction standby state on the 0001 "track, is shifted to the reproduction state.

As a result, from the optical disk 1, the video and audio of the television broadcast program whose recording has been started by the first optical head H1 first from time t1 are reproduced. Further, at this time, the second optical head H2 is in a standby state for reproduction on the track of the address "0001" in advance, so that the reproduction can be started immediately at the time t2 when the chase reproduction button is pressed, and therefore, the reproduction standby is performed. Chasing playback that does not require time is realized.

The reproduced signal read from the optical disk 1 by the second optical head H2 is sent to a demodulator 33, a format converter 34, and a D / A converter 35 in order, and the reproduced video and audio signals are output from a terminal 36. Is output.

In the example of FIG. 2, even after the chasing reproduction by the second optical head H2 is started, the first optical head H
Recording by 1 is continuing. Therefore, at time t2
After that, the video and the audio that are chased and reproduced by the optical head H2 are continuously obtained.

The still image at the time when the recording start button is pressed may be loaded into a still image memory (not shown) and displayed on the screen until the chase playback button is pressed. Further, the fact that the scene is being recorded from the scene may be displayed as a single message or overlaid on a still screen.

Further, the second optical head H2 is not used only for the chase reproduction. Of course, it is also possible to cancel the chase reproduction and perform the normal reproduction operation during the chase reproduction, for example. Therefore, it is possible to reproduce an arbitrary position on the optical disk while recording is performed by the first optical head H1.

Next, as a second operation example, an operation in a case where a fast forward button is pressed to skip, for example, a commercial portion during fast chasing reproduction by the second optical head H2, and fast forward reproduction is performed. 3 will be described.

As described above, during the chase reproduction by the second optical head H2, if the fast-forward button is pressed to skip a commercial portion, for example, the fast-forward reproduction is performed. The reproduction position may catch up with the recording position of the first optical head H1. That is, as shown in FIG. 3, for example, when the recording by the first optical head H1 is started at time t10 and the address of the recording start position is "0001", the time is recorded by, for example, the second optical head H2. After t11, the chase reproduction after the address "0001" is started, and thereafter the fast-forward reproduction is performed several times during the chase reproduction, so that the reproduction position of the second optical head H2 is shifted to the position of the first optical head H1. In some cases, catching up with the address “0800” of the current recording position may occur.

In the optical disk recording / reproducing apparatus of the present embodiment, the first position supplied from the head position monitoring units 22 and 38 is used to prevent occurrence of a situation in which the chase reproduction position catches up with the recording position. Optical head H1 and the second
The system controller 5 constantly monitors the position information of the optical head H2 of the second optical head H2, and the second optical head H that is constantly chasing and reproducing.
2 performs control so as not to overtake the recording position of the first optical head H1 during recording.

Here, as described in the second operation example, the situation where the second optical head H2 during chase reproduction catches up with the first optical head H1 during recording is reproduced by chase reproduction. Means that the current content has caught up with the current broadcast content of the television broadcast program. In other words, the fact that the content being played back by the second optical head H2 has caught up with the content of the current television broadcast program means that at that time the second optical head H2 stops the following playback operation, and This means that the input signal (the current content of the television broadcast program itself) recorded on the optical disc 1 by the first optical head H1 may be output as it is from the monitor device or the speaker.

Therefore, the system controller 5 of the optical disk recording / reproducing apparatus according to the present embodiment, for example, as shown in FIG. 3, addresses the address of the recording position of the first optical head H1.
0800 ", when it is detected from the information from the head position monitoring units 22 and 38 that the address of the chase reproduction position by the second optical head H2 has caught up, the chase reproduction operation of the second optical head H2 is stopped. , The input signal (the current content of the television broadcast program after time t13 itself) is directly output from the monitor device or the speaker.

When the chasing reproduction operation of the second optical head H2 is stopped, the recording operation of the first optical head H1 may be stopped at the same time.
The recording operation by the optical head H1 may be continued as it is. However, when the recording operation by the first optical head H1 is stopped at the same time as the stop of the chasing reproduction operation of the second optical head H2, it is necessary to confirm with the user whether the recording operation can be stopped. Preferably, a confirmation message is output (for example, displayed on a monitor device).

Further, in some disk-shaped recording media, when the reproduction light from the second optical head H2 is irradiated on the optical disk immediately after recording by the first optical head H1, the recorded portion is adversely affected. There are also those with characteristics that can be lost.

From the above, as a third operation example, in the optical disk recording / reproducing apparatus of the present embodiment, the first optical disc is used to prevent the adverse effect of the reproduction light irradiation on the portion immediately after the recording. Control is performed so that the second optical head H2 does not approach within a predetermined interval from the head H1.

The operation control of the second optical head H2 in the case of the third operation example can be performed in the same manner as in the above-described second operation example, and is, for example, within a predetermined interval from the first optical head H1. When the second optical head H2 approaches the second optical head H2, control to stop the chase reproduction operation by the second optical head H2 may be considered.

The predetermined interval between the first optical head H1 and the second optical head H2 can be determined according to the characteristics of the disk-shaped recording medium, and can be arbitrarily set by the user. Is also possible.

Next, as a fourth operation example of the optical disk recording / reproducing apparatus of the present embodiment, for example, when the remaining capacity of the optical disk is exhausted during time-shift recording / reproducing, after chasing reproduction (viewing). The operation when the area is used as a recordable area again will be described with reference to FIG.

In the case of the chase reproduction as shown in FIG. 2, unless the user gives an instruction to stop recording, recording by the first optical head H1 is continued until the television broadcast program ends. Will be. At this time, for example, it is sufficient that the remaining recordable area of the optical disc 1 is sufficient for the remaining time of the television broadcast program, but if not, the recordable area of the optical disc 1 before the television broadcast program ends. As a result, the television broadcast program cannot be viewed to the end (viewing by chase playback).

That is, for example, as shown in FIG. 4, when the recording by the first optical head H1 is started at time t20 and the address of the recording start position is "0001", for example, the second light The chase reproduction from the address “0001” is started from time t21 by the head H2, and thereafter, the recording by the first optical head H1 is continued, so that the remaining recordable area of the optical disc 1 gradually decreases. When the final address (for example, “FFFF”) of the remaining recordable area is reached, new recording cannot be performed any more.

Therefore, as shown in FIG. 4, the system controller 5 of the optical disk recording / reproducing apparatus of the present embodiment allows the first optical head H1 to use the last address of the remaining recordable area as shown in FIG.
If the second optical head H2 detects that the FFFF "has been reached, based on information from the head position monitoring unit 22, the second optical head H2 is performing a chasing reproduction operation from the address" 0001 ", and
After confirming that there is an area that has been chased and reproduced from the address "0001", the second optical head H2
The first optical head H1 seeks to an address "0001" which is an area on the optical disc 1 which has already been reproduced by the chase reproduction, and the first optical head H1 is set as a recordable area after the address "0001". Control is performed such that recording by the head H1 is continued (overwriting is started).

It should be noted that the first optical head H1 is set to the address "F".
When returning from "FFF" to "0001", recording is temporarily interrupted. For example, the recording data rate is set faster than the input data rate so that a buffer memory for input data is provided. Then, continuous recording of data is possible.

On the other hand, the second optical head H during chasing reproduction
When the system controller 5 detects that the second optical head H2 has reached the address “FFFF” based on information from the head position monitoring unit 38, the system controller 5 returns the reproduction position of the second optical head H2 to the address “0001”. address"
Control is performed so as to chase after 0001 ".

When the second optical head H2 is returned from the address "FFFF" to "0001", the reproduction is temporarily interrupted. For example, the reproduction data rate is made faster than the output data rate. If the setting is made and a buffer memory for output data is provided, continuous chase reproduction of data becomes possible.

Next, as a fifth operation example of the optical disk recording / reproducing apparatus of the present embodiment, the second operation example is similar to the fourth operation example.
When the area after the chasing reproduction by the optical head H2 is overwritten (hereinafter referred to as chasing recording) by the first optical head H1, for example, the chasing reproduction is interrupted,
The operation when the same position is repeatedly played back is shown in FIG.
This will be described with reference to FIG.

As in the fourth operation example, when the chase reproduction is interrupted or the reproduction is repeatedly performed in the case where the chase reproduction is completed in the chase recording, the first optical head during the chase recording is used. H1 sometimes catches up with the second optical head H2 during the chase reproduction.

That is, as shown in FIG.
In the case where the recording by the first optical head H1 is started and the address of the recording start position is “0001”, for example, the second optical head H2 makes the time t31.
, The chase reproduction from the address “0001” and thereafter is started, and thereafter, the recording by the first optical head H1 is continued, so that the remaining recordable area of the optical disc 1 gradually decreases, and Last address (for example, "
FFFF "), the first optical head H1
To address “0001”, and this address “00”
In this state, the chase reproduction by the second optical head H2 is interrupted from time t32 to t33 or from time t34 to t35. Address “080” during chasing reproduction by the second optical head H2
When the address of the chase recording by the first optical head H1 has caught up to "1", the area where the chase reproduction by the second optical head H2 has not yet been performed is overwritten by the chase recording by the first optical head H1. Would be.

When the chase recording position by the first optical head H1 reaches the chase reproduction position by the second optical head H2, a recordable area for the chase recording cannot be secured. The system controller 5 of the optical disc recording / reproducing apparatus according to the present embodiment monitors the positions of the first optical head H1 and the second optical head H2 by the head position monitoring units 22 and 38, and constantly performs the second optical head H2 during the chase reproduction. However, the control is performed such that the first optical head H1 during the chase recording is ahead by a predetermined interval.

Further, for example, when the second head H2 during the chase reproduction performs a repetitive reproduction or a fast rewind operation, the area for the chase recording is narrowed or the reproduction over the chase recording area is performed. May be performed.

In such a case, the system controller 5 of the optical disk recording / reproducing apparatus of the present embodiment monitors the positions of the first optical head H1 and the second optical head H2 by using the head position monitoring units 22 and 38. Control is performed so that the second head H2 during the chase reproduction does not approach a side closer to the first optical head H1 than a position preceding by a predetermined interval from the first optical head H1 during the chase recording.

In the optical disk recording / reproducing apparatus of this embodiment, by performing the above-described control, an area for chasing recording can be secured.

It should be noted that the first optical head H during chasing recording
1 and the second optical head H2 during the chase reproduction approach within a predetermined interval because of the second optical head H during the chase reproduction.
This is considered to be the case where reproduction is interrupted.

In this case, for example, when the two approach each other within a predetermined interval, control is performed so that the reproduction of the second optical head H2 is automatically restarted.
An area for chasing recording can be secured. In the example of FIG. 5, the address during the chase recording of the first optical head H1 is the address “08” before the reproduction of the second optical head H2 was interrupted.
When the value approaches 01 ", the chase reproduction of the second optical head H2 is automatically restarted.

Alternatively, when the first optical head H1 during the chase recording is approached within a predetermined interval from the second optical head H2 during the chase reproduction, the control for automatically restarting the chase reproduction is not performed. Alternatively, a message urging the user to hurry the chase reproduction or a message urging the replacement of the optical disk may be generated and displayed on a monitor device or the like to instruct the user to secure a recordable area.

The predetermined interval described in the fifth operation example is an arbitrarily configurable interval such as a predetermined address interval or a predetermined sector interval.
The determination may be made uniformly in consideration of the thermal stability of the disk-shaped recording medium, or may be set by the user according to his or her own usage pattern. In the case of the configuration shown in FIG. 1, there is at least a half-disc interval as a predetermined interval, and this interval is set as a default value. For example, when the user frequently leaves the seat and interrupts chase playback frequently, a longer interval is required. Or, for example, if you want to make the best use of chasing recording, leave the default value.If, for example, the time required for a half-disc of the disk is not enough for thermal stabilization of the disk-shaped recording medium, For example, a longer setting may be considered.

In the above-described embodiment of the present invention, the recording area is described as being continuous. However, in the case of a disk-shaped recording medium, even if there are discrete free areas, the recording and reproducing A buffer memory is prepared in advance, and by appropriately controlling the operation speed of recording and reproduction and moving the optical head at high speed, continuous recording similar to a continuous area can be performed. Therefore, also in the present embodiment, it is needless to say that recording in a skip area, chase reproduction, and chase recording can be similarly performed.

The present invention is not limited to the above-described embodiment, and various changes can be made according to the design and the like without departing from the technical idea of the present invention. Of course, the disk-shaped recording medium is not limited to an optical disk, but can be applied to a magnetic disk medium.

[0074]

According to a first aspect of the present invention, there is provided a disk recording / reproducing apparatus according to the present invention, in which at least first and second two heads capable of performing independent recording and / or reproduction are provided, and each head is independently provided. Head moving means for moving to a radial position on the disk-shaped recording medium, and control means for moving the second head to a position near the recording start position of the first head immediately after the first head starts recording. By doing so, it is possible to reduce the waiting time until the start of reproduction in the case where the second head performs chase reproduction while recording with the first head, and it becomes unnecessary to specify the reproduction start position. can do.

The disk recording / reproducing apparatus according to the second aspect of the present invention includes recording start position storage means for storing a sector position at which the first head has started recording, and moves the second head to the sector position. By setting the reproduction standby state on the corresponding track, in the case where the chase reproduction is performed by the second head while recording with the first head, the waiting time until the start of the reproduction can be reduced. It is not necessary to specify the start position.

According to a third aspect of the present invention, there is provided a disk recording / reproducing apparatus according to the present invention, wherein at least first and second two heads capable of independent recording and / or reproduction are provided, and each head is independently provided in a disk shape. A head moving means for moving to a radial position on the recording medium, a recording start position storing means for storing a recording start position on the disk-shaped recording medium on which the first head has started recording; A head position monitoring means for monitoring the sector position in the first head, a head moving means and a control means for controlling the operation of each head, and after an elapse of an arbitrary time after the first head starts recording, the second head The head performs chase reproduction after recording by the first head from the recording start position. During the chase reproduction operation, the first head precedes the second head and the second head and the first head By so maintaining a distance to the head a predetermined distance, the second head during playback chasing it it is possible to prevent overtaking the first head.

In the disk recording / reproducing apparatus according to the present invention, if the second head catches up with the recording position of the first head during the follow-up reproducing operation, at least the reproducing operation of the second head is performed. Is interrupted, and the input signal is used as the output signal as it is, so that even if the reproduction operation by the second head is interrupted, the output signal can be obtained continuously.

According to a fifth aspect of the present invention, there is provided a disk recording / reproducing apparatus according to the present invention, wherein at least first and second two heads capable of independent recording and / or reproduction are provided, and each head is independently provided in a disk shape. Head moving means for moving to a radial position on the recording medium, recording start position storing means for storing a recording start position at which the first head has started recording, and monitoring of a sector position of each head on the disk-shaped recording medium And a control means for controlling the operation of each head, and the second head starts recording after an elapse of an arbitrary time after the first head starts recording. After the first head starts recording from the position, playback is performed after the recording. When the recording reaches the final recordable area during recording by the first head, the recording from the recording start position to the position where the second head is reproducing is performed. Area is recorded by the first head to prevent the recording from being interrupted halfway due to lack of disk capacity by utilizing the reproduced area of the chasing reproduction. Stable chase reproduction and chase recording are possible without any influence.

In the disk recording / reproducing apparatus according to the present invention, the second head precedes the first head and the distance between the first head and the second head during the follow-up recording operation. Is maintained at a predetermined interval, it is possible to prevent the first head from overtaking the second head during the follow-up recording.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration example of an optical disk recording / reproducing apparatus which is an embodiment of a disk recording / reproducing apparatus according to the present invention.

FIG. 2 shows a first example of the optical disc recording / reproducing apparatus of the present embodiment.
FIG. 7 is a diagram used for describing an operation example of FIG.

FIG. 3 shows a second example of the optical disc recording / reproducing apparatus of the present embodiment.
FIG. 7 is a diagram used for describing an operation example of FIG.

FIG. 4 shows a fourth example of the optical disc recording / reproducing apparatus of the present embodiment.
FIG. 7 is a diagram used for describing an operation example of FIG.

FIG. 5 shows a fifth example of the optical disc recording / reproducing apparatus of the present embodiment.
FIG. 7 is a diagram used for describing an operation example of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Chucking mechanism, 3 ... Spindle motor, 4 ... Rotation axis, 5 ... System controller, 6
... Recording start position storage unit, 7 ... Spindle motor drive amplifier, 8 ... Operation input unit, 11, 31 ... Feed feed motor, 13 ... Input terminal, 14 ... A / D converter, 15,1
8, 34 ... format converter, 16 ... modulator, 17,
33 ... demodulator, 19, 35 ... D / A converter, 21, 37
... feed feed motor drive amplifier, 20, 36 ... output terminal, H1 ... first optical head, H2 ... second optical head

Claims (6)

[Claims] At least first and second recording media capable of independently recording and / or reproducing data on and from a disc-shaped recording medium.
Two heads; head moving means for independently moving the at least first and second two heads to a radial position on the disk-shaped recording medium; and the first head to the disk-shaped recording medium. Control means for moving the second head to a position near the radial position at which the first head has started recording immediately after the start of recording. 2. A recording start position storage means for storing a sector position on a disk-shaped recording medium on which the first head has started recording, wherein the first head starts recording on the second head. 2. The disk recording / reproducing apparatus according to claim 1, wherein a reproduction standby state is set on a track corresponding to the sector position. 3. At least first and second recording media capable of independently recording and / or reproducing data on and from a disc-shaped recording medium.
Two heads; head moving means for independently moving the at least first and second two heads to radial positions on a disk-shaped recording medium; and disk-shaped recording on which the first head starts recording. Recording start position storage means for storing a recording start position on a medium; head position monitoring means for monitoring sector positions of the at least first and second two heads on a disk-shaped recording medium; And control means for controlling the operation of each head. After an elapse of an arbitrary time after the first head starts recording on the disc-shaped recording medium, the second head moves from the recording start position. After the recording by the first head, chase reproduction is performed. During the chase reproduction operation, the first head precedes the second head, and the second head and the first head cooperate with each other. Disk recording and reproducing apparatus characterized by keeping the spacing at predetermined intervals. 4. If the second head catches up with the recording position of the first head during the chase reproduction operation, at least the reproduction operation of the second head is interrupted, and the input signal is output as it is as the output signal. 4. The method according to claim 3, wherein
Disc recording / reproducing apparatus according to the above. 5. At least first and second recording media capable of independently recording and / or reproducing data on and from a disc-shaped recording medium.
Head moving means for independently moving the at least first and second two heads to radial positions on a disk-shaped recording medium; and disk-shaped recording in which the first head has started recording. Recording start position storage means for storing a recording start position on a medium; head position monitoring means for monitoring sector positions of the at least first and second two heads on a disk-shaped recording medium; And control means for controlling the operation of each head. After an elapse of an arbitrary time after the first head starts recording on the disc-shaped recording medium, the second head moves from the recording start position to the second head. After the recording by the first head, the chase reproduction is performed. When the recording reaches the final recordable area of the disc-shaped recording medium during the recording by the first head, the recording is started from the recording start position. Serial The reproduced region between the second head to a position being reproduced, the disk recording and reproducing apparatus, which comprises a recording chased by the first head. 6. The method according to claim 1, wherein the second recording is performed during the chasing recording operation.
6. The disk recording / reproducing apparatus according to claim 5, wherein the first head precedes the first head and maintains an interval between the first head and the second head at a predetermined interval.