JPH113523A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device which allows to reproduce information being recorded on a recording medium from any position and to record the information being reproduced on the recording medium into any position with simple devices which simultaneously access a single recording medium using two optical heads without a complicated controlling method. SOLUTION: This device is provided with a recording head 1 which is installed in the manner capable of tracking operation in opposition to one surface of an optical disk 4, a reproducing head 2 which is installed so as to oppose the face identical with the surface of the optical disk 4 to which the recording head 1 opposes in the manner of being capable of tracking operation independent of the recording head 1, a memory section 7 which stores the track position having been recorded by the recording head 1, and a control section 20 which makes the recording head 1 perform recording operation to an unrecorded region based on the recorded track position stored in this memory section 7 and concurrently makes the reproducing head perform reproducing operation in a recorded region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to an optical disk device represented by a digital video disk and the like, which has two optical heads and simultaneously performs recording and reproduction.

[0002]

2. Description of the Related Art Hitherto, there has been proposed an optical head used in a magneto-optical disk storage device, which is capable of forming two light spots and simultaneously performing storage and reproduction. Such an optical head is disclosed in JP-A-7-142.
No. 42 publication. FIG. 2 is a schematic diagram of the optical head described here. This is an optical head for forming two light spots from a light beam emitted by a semiconductor laser on an optical disk as a recording and reproducing medium, and performing recording and reproducing at the same time.

[0003] In FIG. 2, a light beam emitted from a semiconductor laser 101 is collimated by a collimating lens 102, and separated into three light beams by a diffraction grating 103. Thereafter, these three light beams are narrowed down by an objective lens 106 via a beam shaping prism 104 and a beam splitter 105, and are condensed on a recording medium 107. Thus, the optical head described in Japanese Patent Application Laid-Open No. 7-14242 has a configuration capable of forming two light beam spots and simultaneously performing recording and reproduction.

Also, apart from the optical head described in Japanese Patent Application Laid-Open No. 7-14242, the access time is shortened by using two optical heads and simultaneously accessing one storage medium by the two optical heads. A drive device for an optical head has been proposed. As such an optical head,
Japanese Unexamined Patent Publication No. 8-221879 discloses an example. FIG. 3 shows a schematic diagram of the optical head driving device described here.

The optical head driving device described in Japanese Patent Application Laid-Open No. 8-221879 has a host 20 shown in FIG.
1 controls the device, and the host I / F 202 controls a command from the host 201. Controller 20
Reference numeral 3 controls the R / W circuit 204 based on the control data sent from the host I / F 202, and further controls the driving of the optical heads 206 and 207 disposed on both sides of the recording medium 205. The drive control of the optical head 206 and the optical head 207 is performed by the optical head 206 and the optical head 20.
7 is realized by using a servo circuit 208 connected to the control circuit 7. In addition, data to be transferred to each optical head or data read from each optical head is:
By switching the switch 209 connected to the R / W circuit 204, the controller 203 and the optical head 206 are switched.
And the optical head 207 to realize simultaneous and high-speed recording and reproduction on a recording medium.

[0006]

However, in the above-mentioned conventional example, in the optical head described in Japanese Patent Application Laid-Open No. H07-14242, a light beam emitted from one semiconductor laser is collimated by a collimating lens, a diffraction grating, and a beam. Since the light passes through a shaping prism and an objective lens, thereby forming two light spots and irradiating the two light spots on the recording medium surface, the two light spots cannot appear independently. Therefore, playback can be performed only while data such as images and sounds are being recorded on the recording medium, and after an arbitrary time has elapsed since the start of recording, There is a disadvantage that the reproduction cannot be started from the position. That is, it is impossible to independently control the two formed light spots such as a recording-only light spot and a reproduction-only light spot, and to control the two light spots at an arbitrary time and on a recording medium. There is a disadvantage that it is not possible to irradiate the above arbitrary position.

Further, in the optical head driving device described in Japanese Patent Application Laid-Open No. 8-221879, there are two optical heads, one for each, accessing the recording medium from both sides of the recording medium. If one of the optical heads is used for recording and the other is used for reproduction, it is possible to simultaneously perform recording and reproduction from an arbitrary position on a recording medium,
For information recorded on one recording surface of the recording medium,
It is impossible to access at the same time, and after starting recording on one surface of the recording medium using one of the two optical heads, using the other optical head, There is an inconvenience that the information being recorded cannot be reproduced after an arbitrary time has elapsed.

[0008]

An object of the present invention is to solve the disadvantages of the prior art, and in particular, to simultaneously record a single recording medium using two optical heads with a simple apparatus configuration and without using a complicated control method. It can be accessed, and the information being recorded on the recording medium can be reproduced from an arbitrary position, and the information on the recording medium can be recorded at an arbitrary position while being reproduced. It is an object of the present invention to provide a simple magneto-optical disk device.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a recording head provided so as to be capable of performing a tracking operation facing one surface of an optical disk, and an optical disk facing the recording head. A reproducing head provided opposite to the same surface and capable of performing a tracking operation independently of the recording head, a storage unit for storing a track position recorded by the recording head, and a recorded portion stored in the storage unit. A control unit is provided which causes the recording head to perform a recording operation in an unrecorded area based on the track position and simultaneously causes a reproduction head to perform a reproduction operation in a recorded area.

According to the second aspect of the present invention, before the start of the recording / reproducing operation, the control section causes the reproducing head to scan the recorded area, detects the recorded track position from the output of the reproducing head, and detects the detected track position. Is stored in the storage unit.

According to a third aspect of the invention, the control unit detects a tracking position of the recording head during a recording operation, and updates the detected position as a recorded track position in the storage unit. .

Accordingly, the above-mentioned object is achieved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
It will be described based on.

The magnetic disk device shown in FIG. 1 has a recording head 1 provided on one side of an optical disk as a recording medium 4 so as to be capable of performing a tracking operation, and has the same surface as the surface of the optical disk 4 on which the recording head 1 is opposite. A reproducing head 2 provided so as to be capable of performing a tracking operation independently of the recording head 1 facing the surface of the recording head 1, a storage unit 7 for storing a track position recorded by the recording head 1, and a recording stored in the storage unit 7. A control unit 2 for causing the recording head 1 to perform a recording operation in an unrecorded area based on the recorded track position and at the same time cause a reproduction head to perform a reproduction operation in a recorded area.
0.

Before starting the recording / reproducing operation, the control unit 20
The reproducing head 2 is provided with an initial setting function of scanning a recorded area, detecting a recorded track position from an output of the reproducing head 2, and storing the detected position in the storage unit 7. The control unit 20 also controls the recording head 1 during the recording operation.
An update function is provided for detecting the tracking position and updating the detected position in the storage unit 7 as a recorded track position.

More specifically, the optical disk device according to the present embodiment is a recording head 1 for recording information such as an image displayed on a display 16 on a recording medium 4.
And a reproducing head 2 for reproducing information recorded on a recording medium 4, shafts 3 and 3 respectively supporting two optical heads 1 and 2, a recording medium 4 typified by a compact disk, and the like. A spindle unit 5 for supporting and rotating the medium 4; a control circuit 6 for controlling the entire magneto-optical disk device; a storage unit 7 for storing track positions of recorded tracks on the recording medium 4; , A recording head control circuit 10 for controlling the driving of the recording head 1, a control circuit 11 for controlling the reproduction head control circuit 9 and the recording head control circuit 10, and a display 16 A recording circuit 12 for converting information such as an image, etc., into a data format used when recording the information on the recording medium 4; A reproducing circuit 13 for converting the information to a data format used when displaying the information on the display 16, a monitor interface circuit 14 for connecting the recording circuit 12 and the reproducing circuit 13 to the display 16, and a magneto-optical disk drive. Interface circuit 1 that accepts commands for operating recording and playback
And 5.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIG.

In the magneto-optical disk drive according to the present embodiment,
When the recording medium 4 is set and the apparatus is set to the operating state, the reproducing head 2 is first driven to start searching for information recorded on the recording medium 4. The search result is sent to the control circuit 11 via the reproduction head control circuit 9 and then to the storage unit 7 via the control circuit 6 for controlling the entire apparatus. Then, information indicating the track position of the recorded track on the recording medium 4 (recorded track position) is stored. In the present embodiment, the “recorded track position” refers to a position of a track at a boundary between a recorded area and an unrecorded area when tracks of the optical disc are continuously recorded, but is not limited thereto. Not something.

Next, when a recording instruction is issued to the interface circuit 15, the storage unit 7 storing the track position of the recorded track on the recording medium 4 sends the control circuit 6 at present. Information on the recorded track position of the recording medium 4 set in the apparatus is sent. The control circuit 6 checks an empty track of the recording medium 4 based on the transmitted information, and
, The recording start position is specified.

In parallel with the above processing, the monitor interface circuit 14 fetches information such as an image displayed on the display and sends it to the recording circuit 12. The recording circuit 12 converts recording information such as an image sent from the monitor interface circuit 14 into a data format to be recorded on the recording medium 4,
Output recorded information.

The recording head 1 is driven based on a recording start position designated by the control circuit 11.
Controlled by 0. The recording head control circuit moves the recording head 1 to the recording start position, starts the recording operation of the recording head 1, and irradiates the recording information sent from the recording circuit 12 onto the recording medium 4 by the recording head 1. Burn with a laser. Thereafter, the printhead control circuit 10 sends a signal indicating the current position of the printhead 1 to the control circuit 6 via the control circuit 11,
The control circuit 6 determines the track position of the recorded track from the position of the recording head 1 (recorded track position).
And the contents of the storage unit 7 are updated.

After the recording on the recording medium 4 is started,
When an instruction for reproduction is issued to the interface circuit 15 after an elapse of an arbitrary time, the control circuit 6
Sends the track position where recording has started to the control circuit 11. The control circuit 11 sends the sent track position to the reproducing head control circuit 9 and operates the reproducing head control circuit 9. The reproducing head control circuit 9 moves the reproducing head 2 to the track position where recording is started, and starts a reproducing operation. The reproducing head 2 irradiates the recording medium 4 with a semiconductor laser, reads information recorded on the recording medium 4, and sends the information to the reproducing circuit 13. The reproduction circuit 13 converts the read information into a data format to be displayed on the display 16 and outputs the data to the monitor interface circuit 14. The data read from the recording medium 4 is displayed on the display 16 via the monitor interface circuit 14. You.

[0023]

Since the present invention is constructed and functions as described above, according to the present invention, two optical heads, a recording head and a reproducing head, are provided in a magneto-optical disk drive, and the control unit controls the recording head and the recording head. A storage unit for controlling the reproduction head independently and further storing a track position of a recorded track on the recording medium (recorded track position);
Since the drive control of the recording head and the reproducing head is performed according to the contents stored in the storage unit, the two optical heads can simultaneously and easily access the information recorded on the recording medium, and No complicated device configuration is required. Thus, in a magneto-optical disk device having two optical heads, even when information such as an image is recorded on a recording medium, the contents recorded on the recording medium can be easily and without complicated control. Can be played.

Moreover, since the two optical heads face the same surface of the optical disk, it is possible to read out the information just written during the writing operation by the recording head from the reproducing head without waiting for the end of the writing operation. And application to a verification function or the like is also possible.

Further, according to the second aspect of the present invention, before the start of the recording / reproducing operation, the information of the recorded track position is detected from the recording condition of the optical disk and stored in the storage unit. No matter how many target optical disks are replaced, the recorded track position of each optical disk can be stored in the storage unit.

According to the third aspect of the present invention, the information of the recorded track position is updated in the storage unit during recording, so that a normal recording / reproducing operation depending on the time can be ensured. An excellent optical disk device can be provided.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of an optical system showing a conventional example.

FIG. 3 is a block diagram showing another conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 recording head 2 reproduction head 3 shaft 4 recording medium 5 spindle unit 6 control circuit 7 storage unit 9 reproduction head control circuit 10 recording head control circuit 11 control circuit 12 recording circuit 13 reproduction circuit 14 monitor interface circuit 15 interface circuit 16 display 20 control Department

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 19/02 501 G11B 19/02 501D // G11B 7/095 7/095 C

Claims (3)

[Claims] 1. A recording head which is provided so as to be capable of performing a tracking operation so as to face one surface of an optical disk, and which performs a tracking operation independently of the recording head which is opposed to the same surface as the surface of the optical disk which the recording head faces. A reproducing head provided so as to be capable of storing a recording track position recorded by the recording head, and a recording operation for an unrecorded area for the recording head based on the recorded track position stored in the recording section. And a control unit for causing the reproducing head to perform a reproducing operation in a recorded area at the same time as performing the operation. 2. The control unit causes the reproducing head to scan the recorded area before starting the recording / reproducing operation,
2. The optical disk device according to claim 1, wherein the recorded track position is detected from an output of the reproducing head, and the detected position is stored in the storage unit. 3. The control unit according to claim 1, wherein the control unit detects a tracking position of the recording head during the recording operation, and updates the detected position as the recorded track position in the storage unit. An optical disk device as described in the above.