JPS63201944A - Optical storage device - Google Patents

Abstract

PURPOSE:To reduce the start/stop time of a spindle at the time of exchanging a medium and to execute a high speed access by minutely shifting the storage medium in parallel with the plane of rotation and adjusting the center of a track on the storage medium so that it coincides with the rotary center of a rotor. CONSTITUTION:The titled device is provided with a focus control part 7 which is supported by the rotor in such a way that it can independently be shifted in the directions of a radius and a rotary axis and which can optically focus with respect to the storage medium 11 which can execute recording and reproduction, a means for rotating and driving the rotor, a means for shifting the focus control part 7 in the direction of the radius, a means for supporting the storage medium 11 in parallel with the plane of rotation in the rotor, and a means for minutely shifting the storage medium 11 which a support means has supported in parallel with the plane of rotation, and which can adjust the center of the track on the storage medium 11 so that it can coincide with the rotary center in the rotor. For exchanging the storage medium 11, the center of the track on the storage medium 11 is adjusted so that it coincides with the rotary center in the rotor while holding the focusing part 7 executing recording and reproduction in a state where it is rotated by rotating means 3-5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical storage device, and more particularly, to an optical storage device suitable for library files whose storage medium can be quickly exchanged.

[Prior art] Conventionally, there is no need to update information, such as weather observation, literature, and patent databases, the amount of calls for one piece of information is small, and moreover, a large amount of information storage is required.
For so-called library files (also called archive files), optical disk devices have been used, which have a faster access speed than magnetic tapes and a lower storage unit cost than magnetic disks.

The storage cost of optical disks is low because, like magnetic tape, the medium is replaceable, and by combining this with an autochanger mechanism that automatically exchanges a large amount of media in a single recording/playback device, it is possible to create a storage system. However, on the other hand, the time required to exchange media affects the final system traffic, and it is necessary to handle more media with one recording/playback device to lower the storage unit cost. It was necessary to shorten the medium exchange time.

In other words, the media exchange time includes the time to stop the rotating disk device, the time to remove the media, the time to store the media in the warehouse, the time to take out the target media from the warehouse, and the time to load the media to the spindle. This can be expressed by the installation time and spindle startup time.

Therefore, in order to shorten the time required for such a series of operations, it may be possible to use multiple media moving mechanisms (accessors) per spindle, but in any case, the time it takes to start and stop the spindle will be reduced. do not have.

Furthermore, as a means of improving the performance of the apparatus, it is possible to increase the rotational speed of the spindle during steady state, but in this case, more start-up and stop times are required. In other words, if an attempt is made to shorten the starting and stopping time, a high-output motor is required, and there is also the drawback that vibration suppression during startup, which is common with large-output motors, is required. In addition, it was necessary to manage the large number of media so that the individual media would not be unbalanced due to rotation.

[Problems to be Solved by the Invention] As mentioned above, in conventional optical storage devices, it takes too much time to install the medium each time the medium is replaced and to start and stop the disk device that rotates the medium, resulting in a reduction in the storage unit cost. It ends up being expensive.

The purpose of the present invention is to focus on the above-mentioned conventional problems and to solve them.Unlike conventional optical disk devices, the optical head is constantly rotated, thereby reducing the time required to change media. The purpose of this invention is to provide an optical storage device that can perform

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a rotating body that is supported by a rotating body so as to be movable independently in the radial direction and the rotational axis direction thereof, and is capable of recording and reproducing. A focus control section capable of optical focus adjustment for a storage medium, means for rotationally driving a rotating body, means for moving the focus control section in a radial direction, and means for supporting a storage medium parallel to a rotation surface of the rotating body. and means capable of finely moving the storage medium supported by the support means in parallel to the rotating surface so that the center of the track on the storage medium coincides with the center of rotation of the rotating body. Features.

[Function] According to the optical storage device of the present invention, when a recording medium is replaced, the focus control section involved in recording and reproduction is kept in a rotated state by the rotation means, and the track center of the storage medium is simply rotated. Since it is only necessary to make fine adjustments to match the center of rotation of the body, the time required to start and stop the storage medium disk each time it is replaced can be saved, and high-speed access can be achieved.

[Examples] Examples of the present invention will be described below in detail and specifically based on the drawings.

FIG. 1 shows an embodiment of the invention. Here, 1 is a rotary optical head mechanism (hereinafter simply referred to as an optical head), and 2
is an optical path provided along the three axes of the rotating part of the optical helad 1,
Reference numeral 4 denotes a motor that rotates the optical head 1. 5 is a rotary transformer, 6 is an actuator attached to the top of the rotating part 3, and the actuator 6 has a focus control part 7 and a balancer 8 symmetrically provided at its tip,
It is held by an actuator 6 so as to be freely expandable.

9A and 9B are mirrors disposed in the optical path 2; 10 is a light emitting/receiving unit fixed to the device; 11 is a recording medium placed so that its center is aligned with the axis of the rotating unit 3;
Recording signals manually input to the recording medium 11 and the recording medium 11
The reproduced signal output from the is transmitted and received by the light emitting/receiving section 1G, and the optical signal passes through the optical path 2 provided at the rotation center and the optical path inside the actuator 6, and in between,
Since it is reflected by A and 9B, it is optically coupled with the rotating focus control section 7, and thus the optical head 1 can have the same function as the optical head of an optical disk device.

12A and 12B are a pair of moving mechanisms arranged at axially symmetrical positions in two directions orthogonal to each other, both of which are movably held by a guide rail 13, and the moving mechanisms 12A and 12B have circular Clamp members 14 are used to grip the plate-shaped recording medium from all sides.
is provided.

Note that since the signals and power for focus control and minute track following are transmitted via the rotary transformer 5, the structure of the focus control section 7 is no different from that of the optical head in a conventional optical disk device, and the optical path 2 may be hollow or optical fiber. Furthermore, the light emitting/receiving section 10 naturally includes a beam splitter (not shown) provided in a conventional optical head, but these are omitted as they are not directly relevant to the explanation of the operation of the present invention.

In the optical storage device configured in this way, since the focus control section 7 can be extended in the rotational radial direction by the actuator 6, any one of the many tracks provided on the medium 11 can be selected. Further, electric power for driving the actuator 6 is also sent to the rotating section 3 via the rotating transformer 5, and such signal transmission and reception via the rotating transformer 5 is well known in VTRs and the like. In addition,
If the focus control unit 7 is moved six times in the rotational radial direction, the rotational mass balance will be disrupted and the rotational spindle will be adversely affected.
This problem can be solved by moving the balancer 8 at the same time as the focus control section 7, since the balancer 8 having the same mass as the focus control section is disposed in an axially symmetrical position.

Furthermore, concentric tracks or spiral tracks are formed on the medium 11, which are pregrouped around one rotation center, but when replacing the medium 11, how can the medium 11 be positioned with high precision? Even if it is held, it is difficult to align the rotational center of the track on the medium 11 that has already been recorded with the rotational center of the rotary optical head 1. Therefore, in this example, the medium clamp member that holds the replaced medium 11 is slightly displaced by the moving mechanisms 12A and 12B, and the rotational-order synchronization component of the reproduced track position error is controlled to be zero. The rotation centers can be made to coincide with each other. Here, since the moving mechanisms 12A and 12B basically only move the medium 11 by a minute amount when the medium is loaded, there is no need for a high-speed moving mechanism such as a voice coil motor, and low-power devices such as piezoelectric elements and step motors are not required. That's enough.

Therefore, in the case of this example, first, the selected medium 11 is sent from the medium warehouse to the recording/reproducing unit, and the center of the concentric track or spiral track is moved to the guide rail 11.
The mounting position is determined along the same line, so that the center of the rotation axis of the recording/reproducing section roughly coincides with the center of the rotation axis. After that, the focus controller 7 is moved closer to the medium 11 (focus) by retracting (defocusing) to a safe distance in advance, and the amount of center deviation is measured by reproducing the track position information. are slightly displaced by the moving mechanisms 12A and 12B.

During this time, since the rotating optical head 1 continues to rotate at a constant speed, there is no need for startup time. When replacing the medium, it is sufficient to defocus the focus control section 7 to attach and detach the medium, and there is no need to stop the rotation. In this case, since there is no media blur (runout) due to media rotation, the amount of defocus can be small.Furthermore, the high-order minute off-track that remains after the centers of rotation are matched is handled by a built-in control unit in the focus control unit 7. There is no problem since the tracking can be performed using the track following mechanism that is provided. This track following mechanism may be one that shifts a focusing lens or one that moves a mirror. Furthermore, in this example, there is no need for the track following mechanism to follow eccentric components, which is a problem with ordinary optical discs, so the tracking range is small.
There is an advantage that the mechanism can be simplified. In addition, regarding focus adjustment, in a normal optical disk, it is necessary to constantly follow the medium blur (runout) due to rotation, but in the present invention, since the medium 11 is stationary, there is no need to worry about medium runout occurring.1. Therefore, since the necessary focus adjustment range is also small, the focus control section 7 can also be made small.

Furthermore, since the spindle motor basically rotates continuously, the spindle motor may be small enough to maintain rotation.

In addition, in this example, only the dynamic balance of the rotating part is maintained, and the inertial mass of the rotating part changes as the focus control part 7 moves in the rotational radial direction, but since the impulse is conserved, the result is Since the speed of the focus control unit 7, which is a concentrated mass, is kept almost constant, this is equivalent to the constant linear velocity (C
It can be said that this form is suitable for high-speed memory reproduction of the LV) type. Of course, since it is not a completely lumped mass system, there will be slight fluctuations in linear velocity, but it is well known in the speed matching buffer 1 of magnetic disk drives that by using a small amount of buffer memory, this fluctuation can be controlled within an allowable range. This is the technology of

Of course, it is also possible to perform recording and reproduction in a constant angular velocity (CAV) format like a conventional magnetic disk.

FIG. 2 shows such an embodiment. In this example, a double rotation type is used so that the inertial mass of the rotating optical head portion is always constant.

That is, reference numeral 16 is a rotary arm that is attached to extend in the radial direction from the rotary part 3, and a swinging actuator 17 is provided at the tip end P1 of the rotating arm. A second swing arm 18 is swingably supported. 19 is the swing arm 18
This is a second balance member attached to the other end of the focus control unit 7 disposed at one end.

In the CAV type optical storage device configured in this way, the focus control unit 7 and the second balance member 19 are arranged so as to balance the inertial mass around the tip portion P1, and the swing arm 18 The part supported by the rotating arm 16 including the swinging actuator 17 that swings through the arm 1B maintains a balanced inertial mass with the balance member 8 attached to the opposite side of the arm 1B. Therefore, by rotating the rotating part 3 at a constant angular velocity and swinging the swinging arm 18 in either direction of the arrow "+S" by the swinging actuator 17, recording/reproduction is performed on a recording medium disk (not shown). Can be done.

Further, although FIG. 1 illustrates a disk-shaped medium 11, in the present invention, since the medium is merely arranged almost statically, there is no need to dynamically balance the inertial mass by making it circular. Any shape is acceptable as long as it is convenient for medium exchange and medium positioning.For example, as shown in FIG. There is no problem as long as the optical head is dynamically balanced, and it is suitable for media used in large numbers.
Another advantage of the present invention is that the dynamic balance of the two is not a problem. Note that T here indicates a track.

[Effects of the Invention] As explained above, according to the present invention, there is no need for starting and stopping the spindle, which is required in conventional optical discs, when exchanging media. High-speed access can be achieved in a suitable manner.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the basic configuration of a recording and reproducing section of an optical storage device of the present invention; FIG. 2 is a perspective view showing the basic configuration of a recording and reproducing section according to another embodiment of the present invention; The figure is a perspective view showing another example of the shape of the medium. DESCRIPTION OF SYMBOLS 1... Optical head, 2... Optical path, 3... Rotating part, 4... Motor, 5... Rotating transformer, 6... Actuator, 7... Focus control part, 8... - Balancer, 9A, 9B... Mirror, 10-... Light emitting/receiving unit, 11... Recording medium, 12^, 12B... Moving mechanism, 13... Guide rail, 14... Clamp member, 15... Handle, 16-... Rotating arm, 17... Swinging actuator, 18... Swinging arm, 19... Second balance member, Pl... Tip, T... Track , S...Swing direction.

Claims (1)

[Scope of Claims] 1) A focus control unit that is supported by a rotating body so as to be movable independently in the radial direction and rotational axis direction thereof, and is capable of optical focus adjustment for a recording and reproducing storage medium; , means for rotationally driving the rotating body; means for moving the focus control unit in the radial direction; means for supporting the storage medium in parallel to the rotational surface of the rotating body; and a device supported by the supporting means. It is characterized by comprising means that can be adjusted to finely move the storage medium parallel to the rotating surface so that the center of the track on the storage medium and the center of rotation of the rotating body coincide. Optical storage device. 2) In the optical storage device according to claim 1, constant linear velocity recording and reproduction is possible by the rotating body, the means for driving the rotating body, and the means for moving the focus control section in the radial direction. An optical storage device characterized by: 3) In the optical storage device according to claim 1,
An optical storage device characterized in that the rotating body, means for driving the rotating body, and means for moving the focus control section in a radial direction enable recording and reproduction at a constant angular velocity.