JPS61229280A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To scale down a device, to lighten its weight and to reduce the cost by mounting a head for recording and reproducing and a one for erasing on one carriage and moving reciprocatively the carriage in a direction crossing the recording information pattern string of a recording medium. CONSTITUTION:When information is recorded on a medium 2, a stepping motor 18 is driven to move simultaneously two optical heads main bodies 6 along a straight line A, and two objective lenses 8 are shifted to a position corresponding to a track being a target. Two objective lenses 8 are symmetric to the straight line A, and therefore they can reach the position corresponding to the same track being the target. Since the recording medium 2 rotates in the direction of an arrow, a right-hand optical head executes an erasing action. When an area from which information is erased reaches the position corresponding to a left-hand optical head together with the rotation of the medium 2, an information recording action is carried out, and the left-hand optical head executes a recognizing action caused by the reproduction of recorded information during next one cycle.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information recording and reproducing device, and particularly to an information recording and reproducing device that is capable of recording information on a recording medium, reproducing the recorded information, and erasing the recorded information. Regarding.

Such an information recording and reproducing device is suitably used for optical information recording and reproducing.

[Conventional technology]

Conventionally, a magneto-optical recording and reproducing method is known as one of optical information recording and reproducing methods. In the magneto-optical recording and reproducing system, a disk-shaped medium in which a recording area made of a magnetic layer is formed on a substrate, for example, is used as an information recording medium. When recording information on the medium, the entire recording area made of the magnetic layer is magnetized in the same direction in advance, and a spot laser beam is irradiated while the medium is rotated. Then, a bias magnetic field in the direction opposite to the direction of the preliminary magnetization is applied to the recording area where the beam spot beam is irradiated. The intensity of the irradiated laser beam is modulated by the information signal. Therefore, in a disk-shaped recording medium, if a large irradiation beam spot remains, the temperature of the irradiated recording area will rise to more than a point. As a result, the direction of magnetization of the recording area is reversed to the direction of the bias magnetic field, and when the beam spot intensity is small, the direction of magnetization of the recording area remains unchanged. In this way, information tracks are formed on the medium with patterns of magnetization directions. When reproducing information from a medium on which information is recorded in this way, a laser beam of a certain intensity that does not cause magnetization reversal is irradiated onto the recording i4 turn of the medium in a spot shape, and the recorded pattern is reproduced. The modulated reflected light or transmitted light is guided to the light receiving element. Then, a reproduced information signal is obtained by photoelectric conversion in the light receiving element. Also,
When erasing information recorded on a recording medium, the bias magnetic field is reversed from that during recording, and a laser beam of a certain intensity is applied in the form of a spot to cause magnetization reversal to the recorded A turn of the medium. irradiate.

Therefore, in the apparatus for implementing the magneto-optical recording method as described above, a laser beam is spot-irradiated onto a medium, and the reflected light or transmitted light from the medium is guided to a light-receiving element. An optical head is provided that can reciprocate along the surface of the medium in the radial direction of the medium.

FIG. 3 is a schematic perspective view of an optical head portion in an example of a conventional magneto-optical recording/reproducing apparatus. In the figure, 2 is a disk-shaped recording medium, and the medium 2 is driven by a spindle motor 4.
It is rotated in the z-direction. Reference numeral 6 represents the optical head main body, 8 represents an objective lens that is arranged to be able to move back and forth minutely in the X direction and two directions for tracking control and focusing control, and 10 represents the optical head main body 8. Two bearings 14 and 15 are fitted to one edge of the carriage 10 so as to be slidable on the guide shaft 12 extending in the X direction.
is fixed. A rack 16 is formed along the X direction at the other end edge of the carriage 10, and the rack 16 meshes with a pinion (not shown) fixed to the rotating shaft of a stepping motor 18. Therefore, the carriage 10 is moved to the guide shaft 12 by the stepping motor 18.
is caused to reciprocate in the X direction along the

The optical axis of the objective lens 8 is along two directions, and the medium 2 can be irradiated with a laser beam perpendicularly. Also,
By moving the objective lens 8 in the X direction, the beam beams 4 formed on the medium 2 move in the radial direction of the medium 20.

In this magneto-optical recording device, one optical head performs recording, reproduction, and erasing. Therefore, there is an advantage that only one optical head driving means is required and the apparatus can be made relatively compact. However, when attempting to record new information on a recording medium on which information has already been recorded using this device, the stepping motor 18 is driven to move the optical head main body 6 in the X direction. After moving the objective lens 8 to a position corresponding to the desired track, the medium 2 is rotated by driving the spindle motor 4, and the erasing operation is performed in the first revolution, and then in the next revolution.
An information recording operation is performed in one cycle, and a confirmation operation is performed by reproducing the recorded information in the next cycle. That is, three rotations are required for each information recording. This means that the medium rotates one more time than normal magnetic recording, which only requires two rotations for both the recording operation and the confirmation operation, and requires a relatively long time to record information. In recent years, there has been a growing demand for faster recording, and in this respect the above-mentioned devices are still not satisfactory.Therefore, in order to speed up recording, the system shown in Figure 4 has been developed. Various devices have been proposed. FIG. 4 is a schematic plan view of the optical head portion of the magneto-optical recording/reproducing apparatus.

This device is provided with two optical heads as shown in FIG. 3 above. One optical head 6 (on the left in the figure) is for recording and reproduction, and the other (on the left)
The optical head 6 (on the right side in the figure) is for erasing. The two optical heads are caused to reciprocate in directions forming a predetermined angle θ. Thus, with this device, the recording/reproducing operation and the erasing operation can be performed independently and simultaneously. Therefore, when recording information, the erasing optical head first performs the erasing operation during the first revolution. The recording/reproducing head can simultaneously perform a recording operation of new information on the already completed information track, and the recording/reproducing head can perform a confirmation operation during the next rotation, and the recording is completed in two rotations. Thus,
With this device, the recording time is shortened.

[Problem that the invention seeks to solve]

However, in the magneto-optical recording device shown in FIG. 4, there are two mechanisms for reciprocating the two optical head bodies 6.
There are problems in that it is difficult to miniaturize the device because it requires two parts, and it is difficult to reduce costs because the number of parts is large. Furthermore, in the apparatus shown in FIG. 4, the reciprocating movement of the two optical heads must be performed in association with each other, which makes the control complicated.

[Means for solving problems]

According to the present invention, in order to solve the problems of the prior art as described above, the present invention has a head for recording and reproducing and a head for erasing, and these two heads are mounted on one carriage. An information recording and reproducing apparatus is provided, wherein the carriage is capable of reciprocating in a direction transverse to the direction of the arm turn row of recorded information on a recording medium.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view of an optical head portion of an information recording/reproducing apparatus according to the present invention, and FIG. 2 is a schematic plan view thereof.

In these figures, in Figure 3.

Similar members will be given the same reference numerals and explanations will be omitted.

In this embodiment, two optical heads 6 are placed on the carriage 10. The objective lenses 8 of these two optical heads are arranged so as to correspond to the same information track on the recording medium 2. In this embodiment, since a large number of information tracks are formed concentrically, as shown in FIG. A and a straight line B connecting the centers of the two optical heads 60 and objective lenses 8 intersect at right angles, and furthermore, the intersection of these two straight lines A and B intersects with each objective lens 8.
are the same distance from the center.

In the apparatus of this embodiment as described above, when recording information on the medium 2, the two optical head bodies 6 are simultaneously moved along the straight line A by driving the stepping motor 18 to reach the target. The objective lenses 8 of the two optical heads are moved to positions corresponding to the tracks. Since the two objective lenses 8 are positioned symmetrically with respect to the straight line A as described above, the two objective lenses reach positions corresponding to the same target track. Since the recording medium 2 is rotated in the direction of the arrow, the erasing operation is first performed using the optical head on the right side in the figure. As the medium 20 rotates, the area where information has been erased arrives at a position corresponding to the optical head on the left side in the figure.

Therefore, the information recording operation is performed using the left optical head. Then, in the next round of this recording operation, the left optical head performs a confirmation operation by reproducing the recorded information.

In this embodiment, when simply reproducing and simply erasing information recorded on a recording medium, the left and right optical heads may be used to perform the reproducing and erasing operations, respectively. Furthermore, in the present embodiment, the objective lenses 8 of the two optical heads are moved slightly back and forth in the X direction and two directions relative to the optical head main body 6 to perform tracking and focusing control. Ru.

In the above embodiments, a magneto-optical recording/reproducing device has been described, but the present invention also relates to an information recording/reproducing type device capable of recording, reproducing, and erasing information using other light beam irradiation, and furthermore, The present invention is applicable to all information recording and reproducing type devices that can record, reproduce, and erase information using methods other than irradiation. In particular, the present invention can provide particularly effective improvements in devices in which information is recorded and erased under bias.

Furthermore, the present invention is applicable not only to the case where the recording medium is a disk as in the above embodiment but also to the case where the recording medium is another recording medium such as a tape in which the information track is formed in a straight line.

〔Effect of the invention〕

In the present invention as described above, since the head for recording and reproducing and the head for erasing can be moved by one moving mechanism, it is possible to reduce the weight and cost of the device. It has the advantage of being able to record data in a short time.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an optical head portion of the information recording/reproducing apparatus of the present invention, and FIG. 2 is a plan view thereof. 3 and 4 are a perspective view and a plan view, respectively, of an optical head portion of a conventional information recording/reproducing apparatus. 2: Recording medium, 6: Optical head body, 8: Objective lens, l
O: Carriage, 12-way guide shaft, 18-way tipping motor. Agent Patent Attorney Seki Taira Yamashita Figure 1 Figure 3 Figure 4

Claims (4)

[Claims] (1) Information that is equipped with a head for recording information by arranging recorded information patterns in columns on a recording medium, reproducing recorded information on the recording medium, and erasing recorded information on the recording medium. A recording and reproducing device has a head for recording and reproducing and a head for erasing, and these two heads are mounted on one carriage, and the carriage directs the direction of the recorded information pattern row on the recording medium. characterized by being capable of reciprocating movement in the transverse direction;
Information recording and reproducing device. (2) Information recording and reproducing according to claim 1, wherein the head for recording and reproducing and the head for erasing are arranged so as to always correspond to the same recorded information pattern sequence on the reciprocating path. Device. (3) A patent in which the recording medium is disk-shaped, and a head for recording and reproducing and a head for erasing are arranged symmetrically with respect to a straight line extending in the radial direction from the rotation center position of the recording medium. An information recording/reproducing device according to claim 1. (4) A claim in which information is recorded, reproduced, and erased using light beam irradiation, and a bias magnetic field is applied to a recording medium having a recording area made of a magnetic material when recording and erasing information. The information recording and reproducing device according to item 1.