JPH0212677A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To fix an optical head even in the loading state and to adopt the eccentricity study control system by providing a fixing means of the optical head locking the optical head at the ejection of a cartridge in interlocking with a loading device and operating the fixing means in the loading state. CONSTITUTION:When a cartridge is operated by a drive means 6 to eject it, a fixing means 32 is operated in interlocking with the loading device and an optical head 15 is locked and fixed. Thus, the movement of the optical head 15 at transportation or the like causing a shock is avoided and the drive means 6 drives the fixing means 32 in the loading state of the cartridge to fix the optical head 15, then the disk is driven while the optical head 15 is fixed to execute the eccentricity study control system, then a separate component is not required, the constitution is simple and a cause to increase cost is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention applies a magnetic field to a disk-shaped recording medium (hereinafter referred to as a disk) while irradiating a very small laser beam from an optical head to the disk. The present invention relates to a magneto-optical disk device that records and erases information or reproduces information recorded on a disk.

2. Description of the Related Art Magneto-optical disk devices have rapidly become popular as new external storage devices because they have a large memory capacity per unit area and can record and erase information.

In this magneto-optical disk device, in order to provide a high-speed random access function, a light drive mechanism with as little load resistance as possible is required for the movement of the optical head, and when the device is transported or moved, shocks may be applied to the optical head. In order to prevent damage due to damage, it is necessary to fix the optical head so that it does not move freely when the cartridge containing the disk is ejected.

Therefore, in the past, the optical head was supported movably along the traveling guide axis, a linear motor was used as the driving means, and means for fixing the optical head and means for driving the optical head were separately provided. Therefore, there is a problem in reducing the size and cost of the device.

Therefore, the present applicant has previously proposed a magneto-optical disk device that is provided with an optical head fixing means that locks the optical head when the cartridge is ejected in conjunction with a loading mechanism that loads and ejects the cartridge.

On the other hand, as a method for allowing an optical head to access a desired track on a disk, prior to recording, erasing, or reproducing operations, the disk is rotated and the optical head is operated in a fixed state to align the track relative to the center of rotation of the disk. An eccentricity learning control method is known that detects and stores the amount of eccentricity, and corrects the amount of eccentricity when accessing a desired track during recording, erasing, or playback, thereby allowing high-speed access. .

Problem to be Solved by the Invention However, in order to implement the eccentricity learning control method, it is necessary to fix the optical head as described above, but if a separate fixing means and driving means are provided as in the past, This is disadvantageous for miniaturization and cost reduction, and the optical head cannot be fixed in the loading state if a fixing means is provided that locks the optical head in conjunction with the loading mechanism during ejection.

Therefore, it is conceivable to install a position sensor for the optical head and use servo control B to drive the optical head or operate a near motor to stop it at a predetermined position, but in this case as well, it is not possible to completely fix the head. There is a problem in that the cost is high because a position sensor is required.

In view of the above-mentioned conventional problems, the present invention is a magneto-optical device that does not require a position sensor, has a low cost and simple configuration, can fix an optical head even when a cartridge is loaded, and can employ an eccentricity learning control method. The purpose is to provide disk devices.

Means for Solving the Problems In order to achieve the above object, the present invention provides a loading mechanism for loading a cartridge containing a disc into a recording/playback position 1 and ejecting it from the recording/playback position, and a loading mechanism for loading a cartridge containing a disk at the recording/playback position. A driving means for VA operation, an optical head that travels in the radial direction of the disk in the loaded cartridge to record and reproduce information, and an optical head that locks the optical head in conjunction with the loading mechanism when the cartridge is ejected. The fixing means is characterized in that the fixing means can be operated by the driving means in a loading state.

Preferably, the fixing means is configured to move a swingable fixing lever having a locking pin at its tip via the elastic body 1a. Specifically, a swing lever is provided that can swing about the same axis as the fixed lever and is connected to the fixed lever via a lever, and the swing lever is swinged by a loading mechanism or a driving means. configured to allow

According to the present invention, when the cartridge is ejected by operating the driving means, the fixing means is operated in conjunction with the loading mechanism to lock and fix the optical head. Moreover, even when the cartridge is loaded, the drive means can actuate the fixing means to fix the optical head. Therefore, the disk can be driven to rotate and the optical head can be operated in a fixed state. This allows the eccentricity learning control method to be implemented without requiring any separate parts.
It has a simple configuration and does not become a cost factor.

Also, elastic can be used as a fixing means! ! By providing a fixed lever that is swung through an impactor, and further providing a swiveling lever that is swung by a loading mechanism or drive means and connected to the fixed lever with a spring serving as the elastic buffer, smooth operation can be achieved. Can be secured.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

Disc 1 (see Figures 5 and 6) is cartridge 2
A radial opening for recording and reproducing, which is housed in the cartridge 2 and is formed in the cartridge 2, is always closed by a slidable shutter 3 having a corresponding opening 3a. Reference numeral 4 denotes an end plate fixed to the front end of the base 5 of the magneto-optical disk device, and an insertion opening 4a for the cartridge 2 is formed therein.

Reference numeral 6 denotes a rotational drive means that clamps and rotates the disk 1 when the cartridge 2 is loaded;
It is fixed to the base 5. 7 is a housing that holds the inserted cartridge 2, and is supported on the base 5 so as to be movable up and down, and IO has four rollers 8 attached to the front and rear of both (C1) surfaces. This is an eject plate placed on the top of the eject plate, and the guide hole 10a engages with four pins 9 fixed to the base 5, so that the eject plate is guided so as to be movable back and forth, and is constantly biased forward by a spring 13. Furthermore, inclined cam grooves 12 are formed in the rising pieces 11 on both sides of the eject plate IO, and when the roller 8 is engaged with the inclined cam grooves 12, when the eject plate 10 is moved forward by the biasing force of the spring 13, the housing 7 is lowered. The cartridge 2 held therein is loaded into the recording/reproducing position.

An optical head 15 supported by a pair of guide shafts 14 so as to be movable back and forth is disposed at the rear part of the base 5 . As shown in detail in FIG. 6, a coil 17 of a near motor 16 for moving the optical head 15 is attached to the upper surface of the rear end of the optical head 15. As shown in FIG. Reference numeral 18 denotes a U-shaped yoke, which is fixed to the upper surface of the rear end of the base 5 with a flaket 19. A coil 17 is fitted onto the lower piece 18a of the yoke 1B with a gap left, and the coil 17 is fitted onto the upper piece 18b of the yoke 1B. A magnet 20 is attached to the inner surface of the holder. Further, the ends of each piece 18a, 18b of the yoke 18 are connected by a lid piece 18C.

At the rear of the upper surface of the housing 7, air bias means 21 is provided.
is installed. As shown in FIG. 6, this magnetic biasing means 21 consists of a coil 24 wound around a bottomed cylindrical yoke 22 having a center yoke 23, and a length corresponding to the recording area at the tip of the center yoke 23. A yoke 25 at the tip of the recording head is fixed, and a small and thin magnetic bias means 21 is configured to uniformly apply a magnetic field to the entire recording area.

An L-shaped engagement piece 26 extends rearward from one side of the rear end of the eject plate 10, and is driven by a drive means (not shown) to the base 5.
An operating pin 2 movable along an arcuate hole 27 formed in the
8 (shown by imaginary lines in FIG. 1), moves the eject plate 10 backward against the biasing force of the spring 13, raises the housing 7, and ejects the cartridge 2. has been done. In addition, the rear end of the housing 7 -
An opening/closing lever 29 extends forward on the side and is urged by a bar 229a (see FIG. 5) on the edge side, for example. The engagement pin 30 at the tip of the opening/closing lever 29 engages with one side edge of the shutter 3 of the cartridge 2, and as the cartridge 2 is inserted, the opening/closing lever 29 swings toward the center, opening the shutter 3. It is configured as follows. 3
Reference numeral 1 denotes an arcuate groove formed in the housing 7 through which the engagement pin 30 passes.

A lock lever 32 is swingably attached to the rear side of the base 5, and is biased toward the side edge side by a spring 32a (see Fig. 5). A locking roller 33 that engages with the inner edge of the eject plate 10 is attached, and when the eject plate 10 moves rearward, the locking roller 33 fits into the engagement recess 34 and locks in that position. There is °. Further, a passive lever 35 extends diagonally toward the center from this lock lever 32, and when the passive pin 36 at the tip is pushed by the tip of the inserted cartridge 2, the long lever 32 is applied with its biasing force. The locking roller 33 is disengaged from the engagement recess 34 and the ejecting plate 10 is moved forward by the biasing force of the spring 13.

Further, a fixed lever 37 extending rearward is swingably attached to approximately the center of one side of the base 5, and is biased toward the edge by a spring 38, for example. A locking pin 39 is provided at the tip of this fixing lever 37, and the optical head 15
The optical head 15 is fixed by fitting into appropriate teeth of a fixed tooth row piece 40 attached to one example. As shown in detail in FIG. 4, a swinging lever 41 movable around the same axis as the fixed lever 37 is provided so as to overlap the lower side of the fixed lever 37, and near its base -
A retaining pin 43 is provided on the side to engage a cam plate 42 attached to the inner edge of one side piece of the eject plate 10. The swing lever 41 and the fixed lever 37 are elastically connected by a spring 44, and when the swing lever 41 swings toward the center by the cam Fi42 as the eject plate 10 moves rearward, The fixing lever 3
7 is biased toward the center against a spring 38, and a locking pin 39 at the tip thereof is configured to fit into and engage with a suitable tooth of the fixed tooth row piece 40.

Furthermore, a locking protrusion 45 is protruded from one side near the tip of the swinging lever 41 so as to engage with the operating pin 28 from inside, and the swinging pin 28 swings the moving lever 41 toward the center. The optical head 1 is fixed with the locking pin 39 at the tip of the fixing lever 37.
5 can be fixed.

Next, to explain the operation, insert the cartridge 2 into the insertion slot 4a.
When inserted from above, it is housed and held within the housing 7. As the cartridge 2 is inserted, the shutter 3 is opened by the opening/closing lever 29. Furthermore, when the cartridge 2 is pushed in to the end, the driven pin 36 at the tip of the driven lever 35 is pushed by the tip of the cartridge 2, the lock lever 32 swings toward the center, and the locking roller 33 is disengaged from the engagement recess 34. eject t-+
i10 moves forward under the urging force of spring 13. As a result, the housing 7 moves downward due to the engagement between the inclined cam groove 12 and the roller 8, the cartridge 2 and the magnetic □ bias means 21 descend, and the cartridge 2 is loaded into the recording/reproducing operation position. Note that the lowering of the cartridge 2 is stopped midway by a pin (not shown) protruding from the base 5, so that the gap between the disk 1 and the magnetic bias means 21 becomes a predetermined value. There is. Further, by moving the eject plate 10 forward, the swing lever 41
The engagement pin 43 is disengaged from the cam plate 42, and the fixed lever 37 and the swing lever 41 swing to one side by the spring 38,
The locking pin 39 comes off from the fixed tooth row piece 40, and the optical head 1
5 becomes movable and random access is possible using the linear motor 16.

Here, in order to perform an access method using eccentricity learning, in which the amount of eccentricity with respect to the center of rotation of the track of the disk 1 is detected in advance before recording and playback, and the amount of eccentricity is corrected at the time of access, the disk 1 is driven in one rotation. At the same time, the optical head 15 is fixed in an activated state. Therefore, the operating pin 28 is moved into the circular arc hole 27 by a driving means (not shown).
Move it clockwise along. As a result, the swinging lever 41 swings toward the center via the engagement protrusion 45, and the spring 4
4, the fixed lever 37 is elastically swung to the central position,
The locking pin 39 at the tip smoothly engages with the fixed tooth row piece 40, and the optical head 15 can be securely fixed. Eccentricity learning is performed in this state.

Next, the disk 1 is rotationally driven by the rotation driving means 6, and a magnetic bias is uniformly applied to the recording area of the disk 1 by the magnetic bias means 21, and the optical head 15 is rotated.
Recording or reproduction is performed by irradiating a laser beam from the disk. Further, by moving the optical head 15 using a linear motor 16, an arbitrary trunk of the disk 1 can be accessed at random. At that time, high-speed access is possible using the eccentric learning control method.

When recording and playback are completed, the operation pin 28 is moved counterclockwise along the arcuate hole 27 by a drive means (not shown).
The eject plate 10 is moved rearward via the engagement piece 26 against the biasing force of the spring 13. Then, the inclined cam groove 12
The housing 7 is raised by the engagement of the rollers 8 and 8. Furthermore, when the eject plate 10 moves backward to a predetermined position,
The locking roller 33 of the lock lever 32 fits into the engagement recess 34 and is locked at that position. At this time, since the cartridge 2 is located opposite the insertion opening 4a, the return urging force of the opening/closing lever 29 and the return urging force of the shutter 3 are applied to the insertion opening 4a.
It is pushed out from a. Further, as the eject plate 10 moves backward, the fixed lever 37 is swung toward the center by the cam plate 42 via the swing lever 41, and the locking pin 39 engages with the fixed toothed piece 40, causing the optical head to move. 15 is fixed to prevent accidental movement.

Effects of the Invention According to the present invention, when the cartridge is ejected by the driving means, the fixing means operates in conjunction with the loading mechanism to lock and fix the optical head, and the optical head moves during transportation, etc., and a shock is applied. This is not the case, and the optical head can be fixed by actuating the fixing means by the drive means even when the cartridge is loaded, so the eccentricity learning control method can be implemented by operating the optical head in a fixed state. . Moreover, it does not require any separate parts, has a simple configuration, and has the advantage of not increasing costs.

Further, a fixed lever is provided which is swung through an elastic buffer as a fixing means, and a swing lever which is swung by a loading mechanism or a drive means is provided and connected to the fixed lever by a spring serving as the elastic buffer. This will have great effects, such as ensuring smooth operation.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, with Figure 1 being a plan view, Figure 2 being an external perspective view, Figure 3 being an exploded perspective view, and Figure 4 being an exploded perspective view.
5 is a detailed perspective view of the loading mechanism, and FIG. 6 is a longitudinal sectional side view schematically showing the arrangement. 1...Disc, 2...Cartridge, 7...Housing, 8...Roller,
Machining 0... Eject plate, 12... Inclined cam groove, 15... Optical head, 26 pa°°/°
Engagement piece, 28... Operating pin, 32...
Lock lever 33...Latching opening -ra, 34...
...Engagement recess, 37...Fixing lever 39
...Lock pin, 40...Fixed tooth row piece,
41... Swing lever 42... Cam plate, 43... Engagement pin, 44... Pa°° spring, 4
5... Engaging protrusion. Acting attorney: Toshio Nakao, Patent Attorney Tsuchibe

Claims (3)

[Claims] (1) A loading mechanism that loads a cartridge containing a disk into a recording/playback operation position and ejects it from the recording/playback position, a driving means that drives the loading mechanism at the time of ejection, and a drive unit that moves in the radial direction of the disk in the loaded cartridge. an optical head for recording and reproducing information; and an optical head fixing means for locking the optical head when the cartridge is ejected in conjunction with the loading mechanism; A magneto-optical disk device characterized in that it is operable. (2) The magneto-optical disk device according to claim 1, wherein the fixing means includes a swingable fixing lever having a locking pin at the tip thereof, and the fixing lever is made to swing via an elastic buffer. (3) The fixing means includes a swinging lever that is swingable around the same axis as the fixed lever and connected to the fixed lever via a spring, and the swinging lever is driven by a loading mechanism or a driving means. 3. A magneto-optical disk device according to claim 2.