JPS63225932A - Reloadable optical disk device - Google Patents

Abstract

PURPOSE:To switch an after-recording operation and a monitoring operation with an easy operation, by constituting a device so that the reproducing beam of a reproducing head can be deviated by one track. CONSTITUTION:When the after-recording operation is performed, the laser beams, of three kinds of heads perform tracking in an order of the reproducing beam 32C, an erasing beam 22B, and a recording beam 12A according to the rotational direction of a disk 1. The track on which reproduction by the reproducing head 31 is completed, a bit of information on which being erased, goes to an erased part. When the disk 1 is rotated in almost half revolution and arrives at the beam 12A, the bit of information accumulated in a buffer memory part is sent to a recording head 11, and is recorded on the same address as that of a bit of old information. When the monitoring operation is performed, tracking control is applied so as to set the position of the beam 32C at the position deviated by one track to an inner peripheral side than the position in the after-recording operation. Since the beam 32C follows on a new recording part, it is possible to perform the monitoring operation by picking up a bit of new information.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is for recording, reproducing, and
This relates to the head configuration of an erasing device.

[Conventional technology]

FIG. 4 is a top view showing a conventional magneto-optical disk memory device disclosed in, for example, Optical Memory Symposium '85, Item 23, and FIG. 5 is a side view of the same. In the figure, (1)
is a disk that records and reproduces information using the magneto-optical effect (
2) is a motor that rotationally drives the disk (1), and (3) is a clamper that clamps the disk (1) to the drive shaft of the motor (2). (5) is magnet A that generates a bias magnetic field during information recording operation, (61 is magnet B that generates a bias magnetic field in the opposite direction to the magnetic field of magnet A (5) during information erasing operation. (11) is a recording head that emits a recording laser beam for recording information on the disk (1);
(12) is the objective lens A of the recording head (11), (15
) is a slider A on which the recording head (11) is fixedly mounted and moves in a desired direction, and (16) 1 (17) is a slider A (1
5) are guide rails A and B that guide the vehicle in the required direction. (18) is a magnet of 0. (19) is: j
A/L/A, these make linear motor A (20)
Configure it. Coil A (19) of linear motor A (2Q)
) section to slider A (15), and slider AC1
5). (21) is an erasing head that emits a laser beam for erasing recorded information on the disk (1), and (22) is an objective lens B of the erasing head (21).
, (23) are sliders B on which the erasing head (21) is fixedly mounted and moved in a desired direction, (24) and (25) are guide rails C and guide rails D that guide slider B (23) in a desired direction. It is. (26) is magnet D1 (27
) is coil B, and these make linear motor B (28)
Configure. Coil B (27) of linear motor B (28)
) section to slider B (23) and slider B (23).
) is driving.

FIG. 6 is a schematic diagram showing the recording pattern of the magneto-optical disk (1) used in the above-mentioned apparatus. (101) is a track with a spiral pattern, and has a sector configuration that is distinguished by a constant recording capacity. (102) is the old recording part where data was already recorded before, (103) is the erase head (21)
The erasing section (1) erases the old recording section (102) signal by
04) is a new recording section in which a new signal is recorded in the erasing section (103) by the recording head (11), and (105) is a new recording section in which a new signal is recorded in the erasing section (103) by the recording head (11), and (105) is provided at the head of the sector and pre-coded address information etc. are stored in the form of perforated bits. This is the pre-7 ormant section provided. (106) is the rotation center of the disk (1), and (R) is an arrow indicating the rotation direction of the disk (1).

Next, the operation will be explained. In recording, reproducing, and erasing information using the magneto-optic effect, it is first necessary to perform an alignment operation to keep the magnetic polarity direction of the recording surface of the recording medium in the same direction. The erasing operation in the device also corresponds to this.

As an initial recording medium, use a Gd(:!O alloy) whose coercive force decreases markedly with temperature rise. When the laser beam of the erase head (21) is irradiated, the recording surface of the disk (1) rises to a temperature above the Curie point.This temperature rise causes the coercive force of the irradiated area to decrease and the magnetization by the magnet B (6) to decrease. The magnetic poles are arranged in the direction.

A linear motor B (28) rotates the disk (1) and causes the erase head (21) to follow the track (101).
If the eraser is driven at 100, it is possible to form a continuous erasing section (103).

The recording operation is performed by the thermal energy of a laser beam intermittently emitted from the recording head (11) according to recorded information and by the magnetic field provided by the magnet A (5) in the direction opposite to the direction of magnetization for erasing. That is, in the area where the laser beam is irradiated and the temperature rises, the magnetic pole is reversed from the erased state, so that recorded information is recorded in the disk (1) by changing the polarity. When reproducing recorded information, the wave nature of laser light is used. That is, it utilizes the effect (Kerr effect) in which when linearly polarized laser light is incident, the plane of polarization of the reflected light rotates according to the direction of magnetization of the reflective surface. When reproducing using this Kerr effect, when the direction of magnetization is reversed, the direction of rotation of the plane of polarization is also reversed. Can be read.

This device is considered as a large storage capacity external storage device for computers that can replace magnetic recording type fixed magnetic disk devices. First, in order to secure a recording zone, a desired part (for example 103) of the disk (1) is moved with the magnet B (6) and the erase head (
The orientation operation is performed by continuous energization in step 21). The recording operation starts when the desired portion (for example 103) reaches the laser beam point of the recording head (11) due to the rotation of the disk (1), and the recording operation is turned on and off according to the magnetic field of the magnet A (5) and the recording information. Recording is performed by reversing the magnetic pole of the recording surface using the thermal energy of the laser beam from the head (11). For playback operation, a polarizer (not shown) is used in the optical system of the head.
This is carried out using an optical system head (in this example, the recording head (11) is responsible) having an analyzer (not shown) and an analyzer (not shown). The laser beam output of the recording head (11) is kept sufficiently low compared to that during recording operation, and the temperature of the beam irradiation part does not exceed one point. If detected by a device (not shown), the recorded information is reproduced. That is, the recording head (11) also serves as a reproducing head.

[Problem that the invention seeks to solve]

Since the conventional magneto-optical disk memory device is configured as described above, it is not possible to perform a reproducing operation at the same time as a recording operation. Therefore, there is a problem in that the required time is too long for an external memory for an electronic computer, which requires, for example, high-speed search, high-speed reading, and high-speed writing. In addition, in the case of continuously recorded audio information, it is possible to add new information from outside to the recorded signal and re-record it in the same location, and in the case of video signals, superimposition, image processing, etc. The problem was that this could not be done with equipment.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an optical disk memory device that can simultaneously perform reproducing, erasing, and recording operations with a simple configuration.

[Means for solving problems]

The optical disk memory device according to the present invention is capable of switching the playback head, erase head, and recording head arranged in a predetermined order on a track of a disk into two types of order (for example, for dubbing and for monitoring) by a switching operation. This is what I did.

[Effect]

The laser beam position of the reproducing head in this invention is
By the switching operation, one of the adjacent tracks is followed and the arrangement order of the three types of heads is changed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In Figures 1 and 2, (1), (2), (1
1).

(12), (15) to (28) and (106) are equivalent to those described in Figs. 4 to 6, and (31)
) is a reproducing head that emits a linearly polarized laser beam to pick up information recorded on the disk (1), converts the reflected light into an electrical signal via an analyzer, and outputs the electrical signal. (32) is the objective lens 0N (12A) of the reproducing head (31), the recording beam of the recording head (11), (22B) the erasing beam of the erasing head (21), (
32 (:ri is the reproduction beam of the reproduction head (31), (10
7) is the circumference A indicating the innermost recordable zone of the disk (1), (201) is the center line A indicating the direction of movement of slider A (15), and (202) is the movement of slider B (23). It is a center line B passing through the rotation center (106) indicating the direction.

The erasing beam (22A) and the reproducing beam (32A) are arranged at positions symmetrical about the center line B (202). (204) is the center line A (201) and the center line B (20
The angle A1 (205) formed by 2) is the recording beam (12A)
is the angle B that the reproduction beam (32C) makes with respect to the rotation center (106).The angle B (205) is the angle B (204)
) The position of the recording beam (12A) is set so as to be the same as the position of the recording beam (12A).

The recording beam (12A), erasing beam (22), and reproduction beam (32) are placed at each point on the spiral of the disk (1), which has eccentricity and meandering, as shown in Figure 2, so strictly speaking Center of rotation of disk (1) (10
6) is operating in a state where it is not equidistant from. This operation is generally referred to as focusing or tracking, and if the mechanical neutral position of each head is set at the same distance from the rotation center (106) as described above, it will be accurate using electrical correction means. Position setting is possible.

Next, the operation will be explained. This optical disk memory device can be used as an audio disk recorder, for example, to perform after-recording operations such as editing and recording songs sung along with karaoke etc. onto a karaoke disc, and ■immediately recording the recorded contents. The case of a monitor operation in which playback and content checking are performed will be explained.

First, in the case of dubbing, the laser beams (12A) and (22B) of the three types of heads are used.

(320) is the direction of rotation of the disk (1) as shown in FIG.

The erase beam (22B) and the recording beam (12A) are irradiated and tracked on the track (101) in this order. The disk (1) rotates, and the karaoke accompaniment part is picked up and played back by the playback head (31). The reproduced track (102) has its information erased by the erase beam (22B) of the erase head (21) and the magnetic field of the magnet B (6), and becomes an erase section (103). This operation is performed continuously while the device is in operation. The signal pinked up by the playback head (31) and the signal sung along with the accompaniment section are combined into a recorded signal by a mixer (not shown) and stored in a buffer memory section (not shown). Since the recording spatula (11) also requires tracking and focusing to be performed at all times, information is reproduced using reflected light during operation. Preformat section (105)
The address information inside is also detected by the recording head (11). The disk (1) rotates about half a revolution, and when the first sector of the signal reproducing section picked up reaches the recording beam (12A), the information stored in the buffer memory section is sent to the recording head (11), and magnet A (5) ) is recorded at the same address as the old information.

In the case of monitor operation, the laser beams (12A), (22B), and (32C) of the three types of heads are set so that the position of the playback beam (320) is one track on the inner circumference side from the case of dubbing operation, as shown in Figure 3. Tracking is controlled by a control circuit (not shown) so that Erasing beam (22
New information is recorded by the recording beam (12A) on the erasing section (103) that has been previously erased in step B), and new information is recorded! un(10
4) However, since the reproduction beam (320) follows this new recording section (104), it is possible to pick up newly recorded information and perform a monitoring operation.

In the above embodiment, the rotation direction of the disk (1) is in the R direction, but if the rotation direction is simply the opposite direction, the position of the reproduction beam (32C) is moved to the outer circumferential side of the disk (1) by one track. By switching to , it is possible to achieve the same function as in the above embodiment of the monitor operation.

Furthermore, since it can be monitored as an external memory for a computer, high-speed searching and high-speed reading are possible.

Note that the arrangement of the three heads in FIG.
1) and the playback head (31) are the same slider B (23).
), and the recording head (11) is fixedly placed on the slider A (
15), but the present invention is not limited to this. The reproducing head (31) is fixedly mounted on the slider A (15), and the recording head (11) is fixedly mounted on the slider B (23) together with the erasing head (21). Alternatively, the reproducing head and recording head may be fixedly mounted on the same slider, or furthermore, three sliders may be provided and a head may be fixedly mounted on each slider. Good too.

〔Effect of the invention〕

As described above, according to the present invention, since the reproducing beam of the reproducing head is shifted by one track, it is possible to switch between the dubbing operation and the monitoring operation with a simple operation.

[Brief explanation of drawings]

FIG. 1 is a top view showing an optical disk memory device according to an embodiment of the present invention, FIG. FIG. 3 is a schematic diagram showing a similar second positional relationship. FIG. 4 is a top view showing a conventional magneto-optical disk memory device, FIG. 5 is a similar side sectional view, and FIG. 6 is a schematic diagram showing a magneto-optical disk used in a conventional magneto-optical disk memory device. In the figure, (1) is a disk, (11), (21)
. (31) is the head, (15) and (23) are the moving tables, (1
2A), (22B), and (320) are beam spots, (
201), (203) are radiation, (204), (205
) is an angle. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent: Masuo Oiwa, Patent Attorney Figure 1 Figure 2 Figure 3

Claims (7)

[Claims] (1) It has a playback head that reads recorded information on a rotating disk with a laser beam, an erase head that also erases the recorded information, and a recording head that also writes information to the disk, and these three types of heads operate simultaneously. The rewritable optical disc device has a spiral recording pattern on the disc, and is provided with at least two movable bases movable in different radial directions of the disc, and the movable bases are moved to an initial position. The three types of heads are divided and fixedly placed on these moving tables so that each beam is basically at the same distance from the center of rotation of the disk when moved an equal distance from the center of rotation of the disk. A switch that selectively instructs the playback head's beam, when equidistant from the center of rotation, to track to a track upstream or downstream adjacent to the track followed by the beams of the other two heads. A rewritable optical disc device comprising: (2) In the case where two heads are placed on one movable base, the scope of the claim is that these heads are arranged on the movable base so that their beams are line symmetrical with respect to the radiation of the movable base. The rewritable optical disc device according to item 1. (3) The beam of a head placed on another moving table is separated from the radiation of this moving table by a distance equal to half the distance between the beams of two heads placed on one moving table. 3. The rewritable optical disc device according to claim 2, wherein one head is arranged on another movable base so that the head is placed on another movable base. (4) A rewritable optical disk device according to claim 2 or 3, wherein a reproducing head and a recording head are placed on one moving table, and an erasing head is placed on another moving table. (5) A rewritable optical disk device according to claim 2 or 3, wherein a reproducing head and an erasing head are mounted on one movable stage, and a recording head is mounted on another movable stage. (6) Rewriting according to claim 5, wherein the recording head is deviated from the radiation of the movable base in the same direction as the reproduction head is deviated from the radiation of the movable base when viewed in the rotational direction of the disk. Possible optical disk device. (7) When three heads are fixedly mounted on three movable tables, each head is placed so that each beam is on the radiation line of each movable table or is equidistant from the radiation beam. Claim 1 placed on each moving platform
The rewritable optical disk device described in Section 1.