JPH02172002A - External magnetic field impressing device in magneto-optical disk device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention moves an electromagnet as an external magnetic field applying means from an initial position near the outer periphery of a magneto-optical disk to a predetermined location close to and facing the surface thereof based on a command. The present invention relates to an external magnetic field application device for a magneto-optical disk device, which is a device for moving and returning the device, and in particular is driven by one rotary power source.

[Conventional technology]

A conventional example will be explained with reference to the following drawings. FIG. 4 is a perspective view of the main part of the conventional example. In this figure, the electromagnet 35 is rotated by a motor 32 and is rotated by another motor 3.
It is configured to be lowered and raised by 6. An arm 34 extending laterally is fixed to the tip of a shaft 33 that is directly connected to the output shaft of the motor 32.

An electromagnet 35 is fixed to the side surface of this arm 34. Further, the motor 32 is fixed on the moving table 31. The movable table 31 is guided so as to be movable upward and downward by a guide mechanism (not shown), and is connected via a motor 36 and a belt 37 so as to be capable of being driven downward and upward. Therefore, electromagnet 3
5 is rotated around its axis by a motor 32 based on a command, and is lowered and raised by a motor 36.

The operation of this external magnetic field applying device will be explained with reference to FIGS. 5 to 7. Figure 5 shows its operation; figure (a) is a plan view of the car when the IJ is installed and before the electromagnet is moved; figure (b) is a side view of the same;
The figures are similar; Figure (a) is a plan view at an intermediate stage of electromagnet movement, Figure (b) is a side view, and Figure 7 is similar; Figure (a) is a plane view at the end of electromagnet movement. figure,
Figure (b) is also a side view thereof.

First, when installing the cartridge 20, as shown in FIG.
As shown in b), the magneto-optical disk (hereinafter simply referred to as disk) 19 is first moved to the right as shown by the arrow from the position indicated by the dashed-dot line, and then downwardly as shown by the arrow from the position indicated by the two-dot chain line. The lower surface of the optical head 18 is closely opposed to the optical head 18, and the optical head 18 is mounted at the solid line display position.

At this time, as shown in FIG. 5(b), the moving device including the electromagnet 35 is located near the outer periphery of the cartridge 20 and does not interfere with the mounting of the cartridge 20, that is, it is in the retracted position.

Next, based on the command, the motor 32 first operates as shown in FIG. 6(a).
As shown in the figure, the electromagnet 35 rotates 90 degrees counterclockwise, and the electromagnet 35, which was initially at the position indicated by the two-dot chain line, pivots to the position indicated by the solid line. At this time, the electromagnet 35 is connected to the cartridge 20.
It is located opposite to and above the hollow portion 20a (see FIG. 6(b)).

Subsequently, the motor 36 rotates counterclockwise at the seventh leap (b), lowering the movable stage 31 and eventually the electromagnet 35 from the position indicated by the two-dot chain line to the position indicated by the solid line via the belt 37, and moves the disk 19 downward. Bring it close to a predetermined position facing the surface. At this time, the motor 32 remains stopped.

[Problem to be solved by the invention]

As described above, in the prior art, two motors 32 and 36 are used to move the electromagnet 35, and it is necessary to increase the rigidity of the arm 34 as a rotating member that holds the electromagnet 35.

Therefore, ■2 motors and arm rigidity measures increase space, weight, and cost, making the device compact and
■The need to take measures to strengthen the arm, which is an obstacle to reducing weight and cost, means that the electromagnet is susceptible to external vibrations and shocks, which impedes proper recording and erasing.■ Using two motors causes problems such as complicated timing control.

The purpose of this invention is to solve the problems of the conventional technology, to have a simple structure, to be small, light, and low in cost, and to be driven by a single rotary power source.
An object of the present invention is to provide an external magnetic field applying device for a magneto-optical disk device.

[Means to solve the problem]

In order to achieve this object, an external magnetic field applying device in a magneto-optical disk device according to the present invention is configured such that an electromagnet as an external magnetic field applying means moves from near the outer periphery of the magneto-optical disk as an initial position to close to the surface thereof based on a command. In a device that is moved to an opposing predetermined location and then returned, (a) it is rotated forward based on a first command, reversely rotated based on a second command, and is rotated with a belt parallel to the surface of the magneto-optical disk. (b) a pinion connected to the belt and guided so as to be able to move in a straight line and rotatable around an axis perpendicular to a plane containing the magneto-optical disk surface; (c) a gear wheel that is capable of moving straight in a direction of another axis and that is rotatable around the other axis in conjunction with the rotation of the pinion; (c) a gear that meshes with the pinion and is parallel to the belt; (d) a mounting frame fixed to the gear and providing the electromagnet; (e) a displacement mechanism capable of displacing the gear in its axial direction in response to the straight movement of the movable platform, for example, one end thereof; a mechanism having a lever rotatably provided on the linear platform, the mechanism having one end engaged with the fixed cam and the other end engaging the shaft of the second gear; The electromagnet is rotated from the initial position to the intermediate location, and then displaced from the intermediate location to the predetermined location in a direction perpendicular to the plane containing the magneto-optical disk surface, and based on the second command, the electromagnet is moved to the predetermined location. from the point to the intermediate point and return to the initial position.

[Effect]

Based on the first command, the belt rotates in the forward direction, and the movable table connected thereto moves straight. As the movable base moves straight, a pinion provided on the movable base that engages with the fixed rack is rotated, and the rotation of the movable base rotates the gear that engages with the movable base, as well as the mounting frame and electromagnet that are fixed to the movable base. Therefore, the electromagnet is moved from its initial position to an intermediate position by the above-mentioned combined movement of the moving table's straight movement and the rotation of the gear.

When the moving table further moves straight, the C gear is displaced in its axial direction via the displacement mechanism, and the electromagnet is moved from the intermediate position to a predetermined position, that is, a position closely facing the magneto-optical disk surface.

When the belt is reversely rotated based on the second command, the electromagnet is returned from the predetermined position to the initial position via the opposite path.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An external magnetic field application device for a magneto-optical disk device, which is an embodiment of the present invention, will be described below with reference to the drawings. FIG. 1 is a plan view of this first external magnetic field applying device, FIG. 2 is a front view thereof, and FIG. 3 is a side view thereof.

In FIGS. 1, 2, and 3, this first device basically includes a belt 1 as a driving member, a moving table 2 that moves in a straight line by this movement, and an electromagnet 4 that rotates and moves in a straight line by this movement. It consists of a mounting frame 3. Note that the mounting frame 3 is formed as a plate-like member having a heat dissipation function and having a large surface area. In addition, means for supporting and guiding each of these members and a transmission means including a power source are additionally provided.

The supporting/guiding means includes a belt t, a guide frame 9 for the movable base 2, and a rotation/linear unit 5 provided to the movable base 2 so as to be rotatable and linearly movable relative to the mounting frame 3. The moving table 2 is provided with a slide bearing 2a, a support shaft 2b and a bearing 2C on the upper surface (see FIG. 2). The guide frame 9 is a plate-like member formed in a frame shape, and includes a belt pulley 9a that supports one side of the belt 1;
Belt wheel 9 for moving the support shaft 9b, bell) 1
c, worm wheel gear 9d fixed to it;
, its support shaft 9e, and a guide shaft 9f that guides the moving table 2 to move in a straight line.
(see FIG. 2), and a cam groove 9g (see FIG. 3). The moving table 2 is connected to a guide shaft 9 via a slide bearing 2a.
It is movable along f (see FIG. 2).

In FIG. 2, the transmission means is a rotary/linear unit 5.
A gear unit 6, a fixed rack 7 lever 8 and, in FIG. 3, a worm gear 21 and a motor 1O as a power source. The rotation/linear unit 5 includes a movable shaft 5a,
It consists of a spur gear 5b provided at one end and a groove-shaped connected portion 5C provided at the other end, and is connected to the movable base 2 via a movable shaft 5a and a bearing 2C, relative to its axis. It is provided so that it can rotate and move straight.

Note that the spring 11 urges the rotation/linear unit 5 upward in its axial direction. The gear unit 6 includes a coaxial pinion 6a and a spur gear 6b, and is provided to be rotatable about the axis of the movable base 2 via a support shaft 2b.

In FIG. 2, the rack 7 is fixed parallel to the belt 1 and meshes with the pinion 6a, and the spur gear 6b is connected to the spur gear 5.
meshes with b. The lever 8 is rotatably provided on the movable table 2 via a support shaft 8a, and has a bifurcated connecting portion 8b that engages with the connected portion 5C at one end and a cam groove 9g at the other end.
A pin 8C that engages with each other is provided. The motor 10 is
It consists of a worm gear 21 provided at the end of the output shaft, and the worm gear 21 meshes with the worm wheel gear 9d.

The operation of this external magnetic field application device is as follows. 1st
In the figure, based on the first command, the motor 1O is started, the worm gear 21 and the worm wheel gear 9d rotate in the normal direction, and the belt 1 rotates in the normal direction.

The moving table 2 connected thereto moves straight downward in the figure from the position indicated by the - dotted chain line. As the movable table 2 moves straight, the pinion 6a provided on the movable table 2 and meshing with the fixed rack 7 is rotated, and the spur gear 5b of the rotation/linear unit 5 is rotated clockwise via the spur gear 6b coaxial with the pinion 6a. At the same time, the mounting frame 3 and electromagnet 4 fixed to the spur gear 5b are also rotated clockwise. Therefore, the electromagnet 4 moves from its initial position indicated by a dash-dot line to an intermediate position substantially facing the hollow portion 20a of the cartridge 20, indicated by a two-dot chain line.

Next, when the moving table 2 further moves straight downward in FIG. 1, the lever 8 is moved between the pin 8C and the cam groove 9g in FIG.
The rotation/linear unit 5 is rotated counterclockwise through engagement with the connecting portion 8b and the connected portion 5c, and the rotation/linear unit 5 is pushed down in the axial direction thereof. That is, electromagnet 4
moves from an intermediate position indicated by a two-dot chain line to a position closely facing the surface of the disk 19 as a predetermined position indicated by a solid line.

Based on the second command, the output shaft of the motor lO and the worm gear 21. Further, when the belt 1 rotates in the reverse direction via the worm wheel gear 9d and the belt wheel 9C, the electromagnet 4 returns from the predetermined position indicated by the solid line to the initial position indicated by the - dotted chain line along the opposite path.

As described above, since the electromagnet 4 takes a combination of linear movement and rotation, it requires a smaller movement space than a simple rotational movement, which contributes to miniaturization of the device.

〔Effect of the invention〕

As explained above, in the present invention, the belt rotates forward based on the first turret command, and the movable platform connected thereto moves straight, and as the movable platform moves straight, the fixed rack attached to the belt rotates in the forward direction. The rotation of this pinion rotates the gear that meshes with this, and in turn the mounting frame and electromagnet that are fixed to this, and in the end, the straight movement of this moving platform and the rotation of the gear are combined. Due to the motion, the electromagnet is moved from its initial position to an intermediate position; as the moving platform moves further straight, the gear is displaced in its axial direction via the displacement mechanism, and the electromagnet is moved from the intermediate position to a predetermined position, that is, the surface of the magneto-optical disk. When the belt is reversely rotated based on the second command, the electromagnet is returned from the predetermined position to the initial position via the opposite path.

Therefore, the present invention has the following superior effects compared to the conventional technology.

(1) Since the electromagnet can be placed close to the surface of the magneto-optical disk, it can be made smaller and consume less power.

(2) As with the previous item, since the space in which the electromagnet moves is small, the external magnetic field application device and, by extension, the magneto-optical disk device that houses it can be downsized.

(3) Based on a belt mechanism, gear mechanism, and cam mechanism, the electromagnet is made to move in a combination of linear and rotational motion,
The space occupied by the predetermined movement of the electromagnet is small, and the device can be made more compact.

(4) Since there is only one power source and the electromagnet is moved by a predetermined amount by forward and reverse rotation of the power source, reliability can be improved and costs can be reduced.

(5) Due to the rigidity of the guide shaft, the moving table is less susceptible to external vibrations and shocks, and the distance between the electromagnet and the magneto-optical disk is maintained well without fluctuation, making it possible to apply a stable magnetic field. Can be done. Therefore, reliability can be improved.

(6) Since the movement is performed by a belt mechanism, the time required for a predetermined movement can be shortened, and timing control can be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, Fig. 4 is a perspective view of main parts of the conventional example, and Fig. 5 is a Also shows the operation,
Figure (a) is a plan view before the electromagnet moves when the cartridge is installed, Figure (b) is a side view, Figure 6 also shows its operation, and Figure (a) is a diagram showing the middle of the electromagnet movement. FIG. 7 shows the operation of the electromagnet. FIG. 7A shows the plan view when the electromagnet has been moved. It is. 1 belt, 2 moving table, 3 mounting frame, 4 electromagnet, 5
Rotation/linear unit, 6 Gear unit, 7 Rack, 8 Lever 9 Guide frame, 10 Motor, 19 Disk, 20 Cartridge, 20a (a) (a) (a) (a) (a) (b)

Claims (1)

[Scope of Claims] 1) An apparatus in which an electromagnet serving as an external magnetic field applying means is moved based on a command from an initial position near the outer periphery of the magneto-optical disk to a predetermined position close to and opposite to the surface of the disk, and then moved back, (a) rotates forward based on a first command and rotates reversely based on a second command, and is connected to a belt parallel to the surface of the magneto-optical disk; (b) connected to this belt and guided so as to be able to move straight; a pinion rotatable around an axis perpendicular to a plane containing the magneto-optical disk surface; (c) a fixed rack that meshes with the pinion and is parallel to the belt; (d) a fixed rack that is fixed to the gear and that operates the electromagnet; (e) a displacement mechanism capable of displacing the gear in its axial direction in accordance with the straight movement of the movable base, and based on the first command, first move the electromagnet from the initial position to an intermediate position The electromagnet is rotated and then moved from the intermediate point to the predetermined point in a direction perpendicular to the plane containing the magneto-optical disk surface, and based on the second command, the electromagnet is moved from the predetermined point to the intermediate point. 1. An external magnetic field application device for a magneto-optical disk device, characterized in that the device returns to an initial position.