JPH01176383A - Disk device - Google Patents

Abstract

PURPOSE:To continue a recording action until a set completion time and to simultaneously reproduce data recorded already by providing an independent head part and servo part exclusive for recording and the head part and servo part exclusive for reproducing. CONSTITUTION:By providing two sets of the head part 103 exclusive for recording and its servo part 104 and head part 105 exclusive for reproducing and its servo part 106, at a disk device with a recording and reproducing function, an effect able to reproduce and trace recorded data in a disk 101 is possible during recording the data, further during the reproduction of updated data can be recorded in a data area in disk in which the reproduction is completed. Thus, data recorded halfway can be reproduced without waiting for a recording completion time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk device, and more particularly to a recording and playback disk device having a mechanism for independently controlling a read-only head section and a recording-only head section. Regarding.

[Conventional technology]

Conventionally, this type of disk device has a common head section and servo section for recording and reproduction (or only reproduction), and the function of the head section is switched between recording and reproduction.

[Problem that the invention seeks to solve]

The conventional disk device described above has recording and playback functions.
Since this was performed using a common head section and servo section, it was necessary to set the state to either recording or playback. In the case of such a mechanism, it is currently impossible to follow and reproduce recorded data during recording, or to follow and overwrite data after reproduction during playback. According to the conventional technology, for example, when arbitrary recording start time and recording end time are set, the recording operation continues until the set end time because the head section is used only for recording during the set time. However, it has the disadvantage of being unable to simultaneously reproduce data that has already been recorded, resulting in a high rate of fraud.

[Means for solving problems]

In addition to the conventional technology, the disk device with a recording/playback function of the present invention has an independent recording-only head section/servo section and a playback-only head section/servo section, and also has two sets of independent heads. It is equipped with a control section for controlling the servo section and the servo section, and has a mechanism that allows recording and reproduction to be performed simultaneously.

〔Example〕 Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

As an example, CLV (Constant 1inear
In the Velocity method, a case will be described in which data recorded on an optical disk by a recording-only optical head section is tracked and reproduced by a read-only optical head section.

A recording-only optical head section 103 records data while being controlled by a servo section 104 from the innermost circumference of the optical disk 101 toward the outer circumference.

After time t from the start of recording, the read-only optical head section 105 is controlled by the servo section 106 to read out the recorded data. Near the recording-only head section 103, the read-only optical head section 105 follows and reads out the recorded data (
t#O, a#b), the read-only optical head section 105
Although the read data can be transferred to the reproduction system without being limited by the rotational speed of the spindle motor 102, the reproduction-only optical head section 105 has a considerable internal position relative to the track position a of the recording-only optical head section 103. When starting to read data from the lap (a>b), since the rotation speed of the spindle motor 102 is synchronized with the recording servo 104,
Only the amount of data limited by the number of revolutions of the spindle motor 1020 can be read from the read-only optical head section 105 located at position b. Therefore, the operation of repeatedly storing and reading the read data in the FIFO memory 108, compressing it, and then transferring the data to the reproduction system is performed under the control of the control unit 107. However, since the amount of data that can be stored is limited depending on the capacity of the FIFO memory 108, tracing with still images, frame-by-frame, or slow-motion playback is required.

Furthermore, when the recording-only optical head section 104 records new data following reproduction by the reproduction-only optical head section 106 (b>a), the rotational speed of the spindle motor 102 is the same as that of the reproduction optical head section. Since the data to be recorded is once stored in the FIFO memory 108, the data to be recorded is controlled by the control unit 107 so that the expanded data is recorded in synchronization with the rotation speed of the spindle motor 102. . In this case as well, the amount of data to be additionally written is limited depending on the capacity of the FIFO memory.

A second embodiment of the present invention is a CAV (Constant
It is applied to the Angular Velocity method. FIFO memory 10 used in the first embodiment described above
8 is not necessary in the CAV system which records and reproduces data at a constant angular velocity. Almost the same as the mechanism shown in Fig. 1, it is equipped with a recording-only optical head section and servo section, and a reproduction-only optical head section and servo section.
It has the advantage that data can be easily recorded and reproduced simultaneously without being restricted by a spindle motor.

This will be explained using FIGS. 2 and 3. In the directory section 210 located at the inner circumference of the disc, file names of data recorded sequentially from the inner circumference, as well as the file data recording start and end points (positions on the disk) are registered, and the control section 207 It is also registered in the memory 209 by the internal CPU 208 at the same time. For example, the recording head section 20
When the data recorded in step 3 is to be played back while being followed by the read-only head section 205, first, the CPU 208 reads the data recorded in the memory 2.
Based on the directory section information registered in 09, the end data recording position of the disc is detected, and the recording head section 2
At step 03, the file name and recording start point of the data to be newly recorded are registered in the directory section 210, and the same data is also registered in the memory 209. Then, the servo section 204 moves the recording head section 203 to the starting position. , start recording.

When reproducing data currently being recorded after a certain period of time has elapsed, the CPU 208 detects the file name and start point for which the recording end point is not registered in the memory 209 (that is, the file name is currently being recorded), and In section 206, the reproduction-only head section 205 is moved to its starting point and reproduction is started.

(Refer to the flowchart in Figure 3) Recording head 203
When the recording of new data is finished, the location is registered in the table in the directory section, and at the same time
Also register on 09. By using the above mechanism, there is an advantage that the search speed for the recording/reproducing start point can be performed at high speed.

〔Effect of the invention〕

As explained above, the present invention provides a disk device with a recording/playback function that includes two sets of a recording-only head section and its servo section, and a playback-only head section and its servo section, so that data can be recorded while the data is being recorded. The effect of being able to play back and trace the data recorded on the disc, and while playing back the data,
This has the effect of making it possible to record new data in the data area of the disc that has been played back.

For example, the present invention is applied to a CAV type recording/reproducing disc device. If the desired broadcast program is set in advance to be recorded on the optical disc from 21:00 to 23:00, recording will start from 21:00 using the recording optical head section, but at 22:00, the reproducing optical head section will be switched to 21:00. By setting the optical disc to the data position recorded from 10:00 onwards, new data can be recorded on the optical disc until 22:00, and data from 21:00 can be played back without waiting for the recording end time. This is an efficient reproduction effect. be.

Further, when applied to a magnetic disk device, there is an effect that while the recording head section is recording data, the reproducing head section can trace the data that has just been recorded.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a second embodiment of the invention, and FIG. 3 is a flowchart of a control method of the second embodiment of the invention. 101.201...Optical disc, 102,20
2... Spindle motor, 103, 203.
...recording optical head section, 104, 204...
... Servo unit for controlling the recording-only optical head unit, 105,2
05...Reproduction-only optical head section, '106,20
6...Servo section for controlling the reproduction-only optical head section, 1
07, 207... Servo section and spindle motor control section, 210... Directory section, 10
8...F engineering FO memory, 208...Control unit CPU, 209...Control unit memory. Agent Patent Attorney Oto Uchihara

Claims (1)

[Claims] 1. A first head section dedicated to a recording function for a disk, a first servo section for controlling the first head section, a second head section dedicated to a playback function, and the second head section dedicated to a playback function; and a second servo section for controlling the head section of each independently, and further,
A disk device comprising a control section that controls the two head sections and the two servo sections. 2. The second head part is more similar to the first head part than the first head part.
2. The disk device according to claim 1, wherein data recorded by the first head located at the rear is reproduced after a certain period of time delay. 3. The first head section is located at the rear of the second head section, and the new data is recorded after a certain fixed time delay after the second head section reproduces the data. The disk device according to scope 1. 4. The disk device according to claim 1, wherein the disk rotates at a constant angular velocity. 5. The disk device according to claim 1, wherein the disk rotates at a constant linear velocity, and the data reproduced by the second head section is outputted via a buffer memory.