JPH06124525A - Magneto-optical disk drive device - Google Patents

Abstract

PURPOSE:To improve an insertion feeling by slide-guiding a shutter opening/ closing member by means of a bias magnet unit with a bias yoke like a bias magnet coil and a guide groove and opening and closing a shutter. CONSTITUTION:A bias yoke M1 is made of a cartridge box plate 10a and another member and whose shape is like a bias magnet coil M3. A bending section g2 of a chevron guide groove 13 formed on the plate 10a is shifted downward by h1 from the upper end of the yoke M1. The angles of groove 13 bias sections are matched. Thus, the initial position of a driving pin P0 is separated from the insertion of a cartridge box 10. Therefore, the insertion of the cartridge in abutting it on the pin P0 is deep and the tilt of the cartridge by the rotation moment of the cartridge around the abutment section with the pin P0 is reduced. Thus, the cartridge can be smoothly inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a magneto-optical disk used as a storage device for a computer, and more particularly to a shutter opening / closing mechanism incorporated in the drive device.

[0002]

2. Description of the Related Art FIG. 6 shows two modes in which a shutter of a cartridge C accommodating a magneto-optical disk D is closed and opened, and FIG. 7 shows a shutter opening / closing mechanism of a conventional drive device. When the cartridge C is loaded into the cartridge box 100 shown in FIG. 7 on the drive device side from the direction A shown by the arrow with the shutter S1 closed as shown in FIG. As shown in b), the shutter S1 is opened to expose the magneto-optical disk D, and the apparatus is placed in a state where data can be recorded and erased or read.

The drive pin P0 is supported by a shutter arm 102 which engages an elongated hole with a fixed pin 101 and is engaged with a guide groove 103a formed by the cartridge box 100, and is then urged by a tension spring 104a. Always cartridge C
It is located on the insertion side of.

The cartridge C is the cartridge box 10
When the drive pin P0 is inserted into FIG.
As shown in FIG. 7, the cartridge C contacts the projection S2 integrated with the shutter S1 and is further inserted, so that the cartridge C drives the drive pin P0.
As a result, the drive pin P0 moves along the guide groove 103a against the spring (not shown) that acts on the shutter S1 in the closing direction and the tension spring 104a to hold the shutter S1 in the open state. It has become. And
When the cartridge C with the shutter S1 opened is completely loaded, the bias magnet unit M used for recording and erasing data has a predetermined distance from the magneto-optical disk D of the cartridge C by means not shown. It is designed to move. Therefore, the means for moving the bias magnet unit M to the magneto-optical disk complicates the structure and increases the cost.

A bias magnet unit M is attached to the cartridge box 100, and a printed circuit board (not shown) constituting a control circuit of the bias magnet unit M is attached to the bias magnet unit M side of the cartridge box 100. As shown in 100, the shutter opening / closing mechanism of the cartridge C is a box 100.
If it is provided on the outer surface of the control circuit, the formation area of the printed circuit board that configures the control circuit becomes small, and it becomes difficult to form the control circuit.Therefore, the drive device has a large space in the thickness direction corresponding to the shutter opening / closing mechanism. Become.

Therefore, in order to solve the above problems, the bias magnet unit M is fixed and does not move.
Moreover, a means has been proposed in which the shutter opening / closing mechanism is hardly exposed on the outer surface of the box 100.

FIG. 8 is an explanatory view of the above means, FIG. 8 (a) is a plan view, FIG. 8 (b) is a sectional view taken along the line BB of FIG. 8 (a),
FIG. 8C is a sectional view taken along the line DD of FIG. 8A.

In FIG. 8, as shown in the figure, the drive pin P
0 is engaged with the dog-legged guide groove 103b formed in the cartridge box base plate 100a of the cartridge box 100, and is always positioned on the insertion side (insertion direction A) of the cartridge C by the urging force of the tension spring 104b.

The cartridge C is the cartridge box 10
When it is inserted into 0, the drive pin P is inserted as in the case described above.
0 abuts on the projection S2 integrated with the shutter S1 as shown. When the cartridge C is further inserted, the drive pin P0 pushes the drive pin P0. As a result, the drive pin P0 becomes a spring (not shown) and a tension spring 104b which act on the shutter S1 in the closing direction along the oblique portion of the guide groove 103b. The drive pin P0 moves to the bent portion where the oblique portion and the vertically descending portion of the guide groove 103b intersect, and holds the shutter S1 in the open state. If the shutter S1 is in this state,
Cartridge box main plate of cartridge box 100 1
A bias yoke M1 formed of the cartridge box base plate 100a, which is the protruding portion of the bias magnet unit M shown in FIG. 8B protruding from the cartridge box base plate 100a fixedly attached to 00a, and E of another member. Core M2, bias magnet coil M
3, the cartridge C can be moved without being blocked. Then, the cartridge C moves together with the drive pin P0 that moves along the vertically descending portion of the guide groove 103b, and the cartridge C is loaded into the cartridge box 100 while keeping the shutter S1 in the open state.

[0010]

In this means, however, as shown in FIG. 8 and as described above,
The shutter S1 of the cartridge C must be fully open before passing through the bias magnet unit M. That is, the center line intersection position g1 of the bent portion where the oblique portion and the vertical descending portion of the guide groove 103b intersect is
This means that it must be above the upper end of the bias yoke M1 of the bias magnet unit M. In the figure, the center line intersecting position g1 of the bent portion is shown to be above the upper end of the bias yoke M1 by h1.

Since the drive pin moves along the slanted portion of the guide groove to open the shutter, the smaller the tilt angle of the slanted portion of the guide groove with respect to the insertion direction of the cartridge, the more the shutter is attached to the cartridge. It will open with a light insertion force. However, if this inclination is small, the initial position of the drive pin, that is, the start position of the guide groove, approaches the insertion port of the cartridge.

When the cartridge is inserted into the cartridge box at such a drive pin position, the cartridge immediately contacts the drive pin. Therefore, a rotational moment acts on the cartridge about the contact portion of the pin, and the cartridge Will be inserted into the cartridge box while being tilted, and it is impossible to insert a cartridge that is very smooth and has a good insertion feeling when the cartridge is tilted in this way.

As a matter of course, the inclination becomes larger as the amount of insertion of the cartridge into the cartridge box becomes smaller and comes into contact with the drive pin, and the insertion of the cartridge which is smooth and has a good insertion feeling. Will be hindered that much.

When the inclination angle of the oblique portion of the guide groove with respect to the insertion direction of the cartridge is large, the initial position of the drive pin, that is, the start position of the guide groove is separated from the insertion opening of the cartridge by a considerable length.

When a cartridge is inserted into the cartridge box at such a drive pin position, the cartridge will contact the drive pin in a state where it has been inserted into the cartridge box for a considerable length, contrary to the above case. Get smaller. However, this time, the shutter opening force of the drive pin due to the cartridge insertion force is small because the tilt angle of the guide groove is large and the component force as the shutter opening force is small, so it is necessary to push the cartridge with a strong force.
After all, insertion of a cartridge that is smooth and has a good insertion feeling is hindered.

The present invention has been made to solve the above problems. That is, when the cartridge is inserted into the cartridge box, the cartridge can be smoothly inserted and the shutter of the cartridge can be opened and closed.
It is an object of the present invention to provide a compact, low-cost, magneto-optical disk drive device having a good insertion feeling, which has a shutter opening / closing mechanism that can be installed in a cartridge box.

[0017]

The object is to have a bias magnet unit composed of a bias magnet coil, a bias yoke, etc., and to open the shutter of the cartridge by a shutter opening / closing mechanism in which a magneto-optical disk cartridge is loaded and incorporated. In a magneto-optical disk drive device for recording / erasing / reading data, a bias magnet unit having a bias yoke similar in shape to the bias magnet coil, and a guide groove for slidingly guiding an opening / closing member of the shutter to open the shutter. And a shutter opening / closing mechanism for opening / closing, which is achieved by a magneto-optical disk drive device,
According to the magneto-optical disk drive device, the shape of the guide groove is such that the center line intersecting position of the bent portion where the oblique portion and the vertical descending portion of the guide groove intersect is below the upper end of the bias yoke. Is achieved.

[0018]

Embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows a first embodiment.
1A is a plan view of the cartridge box 10, FIG. 1B.
1A is a sectional view taken along the line BB in FIG. 1A, and FIG.
It is a DD sectional view taken on the line of (a).

In FIG. 1, the bias magnet unit M is attached to the cartridge box base plate 10a of the cartridge box 10 by four screws S as shown in the figure. As shown in the plan view of FIG. 1A, the bias yoke M1 of the bias magnet unit M is a member different from the cartridge box base plate 10a and has a shape similar to that of the bias magnet coil M3 indicated by a dotted line. Has become.

With the bias yoke M1 having such a shape, the center line intersection position g2 of the bent portion where the oblique portion and the vertical descending portion of the dogleg-shaped guide groove 13 formed in the cartridge box base plate 10a intersect. The shutter of the cartridge is bias magnet unit M even if it is displaced below the upper end of the bias yoke M1 described in FIG. 8 of the conventional example.
The cartridge can be loaded by opening the cartridge without contacting it.

That is, as the drive pin P0 moves along the oblique portion of the guide groove 13, the shutter of the cartridge opens as described above as the cartridge is inserted, but it is located at the center line of the bias yoke M1. After the shutter is opened up to, the shape of the bias yoke M1 on the upper left side of the center line of the bias yoke M1
The shutter, and thus the cartridge, can be moved downward a little before the contact with the bias yoke M1 by the amount that the shutter is opened. Therefore, by selecting the vertical position of the center line intersecting position g2 of the bent portion where the oblique portion and the vertical descending portion of the guide groove 13 intersect with each other, an appropriate position below the upper end of the bias yoke, the shutter is biased to the bias yoke M1. The shutter can be opened to the fully open position without contact. FIG. 1 shows a case where the length from the upper end of the bias yoke M1 to the center line intersection position g2 of the bent portion is h2. After the shutter is fully opened, the cartridge moves along with the drive pin P0 that moves along the vertical descending portion of the guide groove 13 while keeping the shutter in the open state, and is loaded in the cartridge box 10.

As described above, the position where the center line intersects with the bent portion where the oblique portion and the vertical descending portion of the guide groove 13 intersect is shown in FIG.
The shift to the lower side than that described above means that the start position of the skew portion, that is, the initial position of the drive pin P0, is also separated from the cartridge insertion opening of the cartridge box 10 if the skew portion has the same angle. Become. Therefore, when the cartridge comes into contact with the drive pin P0, the insertion depth of the cartridge becomes deep, and the inclination of the cartridge due to the rotation moment of the cartridge centering on the contact portion with the drive pin P0 can be made small. It is possible to insert smoothly and with good feeling.

If the start position of the skewed portion, that is, the initial position of the drive pin P0 is set to the same position as that described in FIG. 8 of the conventional example, the skewed portion of the guide groove 13 is inclined with respect to the insertion direction of the cartridge. The corners will be smaller. When this inclination angle is small, the component force of the drive pin P0 for opening the shutter due to the insertion of the cartridge becomes large, and the shutter can be opened by the insertion force of the light cartridge, and the cartridge is smoothly inserted with good insertion feeling. It becomes possible.

The inclination angle of the oblique portion with respect to the insertion direction of the cartridge is preferably between 35 ° and 55 °.
The best results were obtained with °. By setting this inclination angle to about 49 °, the length of the guide groove 13 described in FIG. 8 of the conventional example is shortened by the length of the vertical descending portion being shortened. Even if the plate thickness is reduced, the rigidity of the cartridge box 10 is maintained.

Further, the bias yoke M1 is a member different from the cartridge box base plate 10a as described above, and its outer shape is substantially the same as the bias magnet coil M3 shown by the dotted line, as shown in FIG. As shown, the thickness of the bias yoke M1 is approximately the same as the thickness of the outer peripheral portion of the E core M2. For this reason, when a current is applied to the bias magnet coil M3 to generate a magnetic field, it helps to minimize leakage of the magnetic field from the magnetic circuit.

The plate thickness of the bias yoke M1 cannot be made thin in order to reduce the leakage of the magnetic field in the system in which the cartridge box base plate described in FIG. 8 of the conventional example is used for the bias yoke. As described above, the bias yoke of the bias magnet unit is formed as a separate member, and the bias magnet unit can be attached to the cartridge box base plate with the screws as described above, so that the plate thickness of the bias yoke is set to the optimum thickness. Made possible Further, as described above, by shortening the guide groove, the rigidity can be maintained even if the thickness of the cartridge box is reduced. Therefore, the thickness of the cartridge box should be sufficient in terms of strength. Another advantage is that it can be cheaper.
According to the present embodiment, the conventional example uses an iron plate having a plate thickness of 0.8 mm, but it is possible to use an iron plate having a plate thickness of 0.5 mm.

2 and 3 show another embodiment in which the length and shape of the above-mentioned tension spring or guide groove are changed.

The second embodiment shown in FIG. 2 is the drive pin P0.
The cartridge box which uses a shorter length of the tension spring 24 for returning the initial position to the tension spring 14 of the first embodiment is used.
This is an example in which the protrusion of 20 on the outer surface is reduced to make it compact. In the third embodiment shown in FIG. 3, the shape of the oblique portion of the guide groove 33 is the linear shape of the guide groove 13 of the first embodiment. This is an example in which the slanted portion is changed to an arcuate shape to smoothly insert the cartridge and improve the feeling of insertion.

That is, in the initial stage of insertion of the cartridge, the drive pin P0 is a region in which the inclination of the guide groove 33 is small, so that the component force for opening the shutter is large, so that the cartridge can be inserted with a light insertion force, and thus the cartridge can be smoothly moved. Insertion Feels good and can be inserted. Then, when the cartridge is inserted and the drive pin P0 approaches the bent portion where the oblique portion and the vertically descending portion of the guide groove intersect,
Since the inclination of the oblique portion of the guide groove is large and the component force for opening the shutter is small, the cartridge is required to have a stronger insertion force than at the initial stage of insertion of the cartridge.
At that time, since the cartridge is inserted deeply into the cartridge box, the cartridge is inserted straight with almost no inclination, and it can be inserted with almost no loss of force, so that it can be smoothly inserted with good insertion feeling. The tension spring 34 in the third embodiment can be made compact by using a short tension spring similarly to the tension spring 24 in the second embodiment.

In the fourth and fifth embodiments shown in FIGS. 4 and 5, the outer shape on the upper left side of the bias yoke M1 when the bias yoke is formed of the cartridge box base plate 40a or 50a is the bias magnet coil. M3
Another embodiment is shown which has a similar shape to that of the first embodiment and has the same function and effect as in the first embodiment. The fifth embodiment is similar to the second embodiment in that a tension spring is used. The length of 54 is shortened to make it more compact.

Further, it is of course possible that the guide grooves 43 and 53 in the fourth and fifth embodiments have the same shape as the arc-shaped guide groove 33 described in the third embodiment.

[0033]

According to the present invention, when the cartridge is inserted into the cartridge box, it is compact and has a shutter opening / closing mechanism that can be installed in the cartridge box to smoothly open and close the shutter of the cartridge. It has become possible to provide a magneto-optical disk drive device that is inexpensive and has a good insertion feeling.

[Brief description of drawings]

FIG. 1 is a plan view and a sectional view showing a first embodiment of a cartridge box of a magneto-optical disk drive device according to the present invention.

FIG. 2 is a plan view showing a second embodiment of the device.

FIG. 3 is a plan view showing a third embodiment of the above device.

FIG. 4 is a plan view showing a fourth embodiment of the above device.

FIG. 5 is a plan view showing a fifth embodiment of the above device.

FIG. 6 is an explanatory diagram showing a shutter operation of the magneto-optical disk cartridge.

FIG. 7 is a perspective view showing a cartridge box of a conventional optical disk drive device.

8A and 8B are a plan view and a cross-sectional view showing another cartridge box of the conventional magneto-optical disk drive device.

[Explanation of symbols]

 10,20 Cartridge box 10a, 40a, 50a Cartridge box base plate 13,33,43,53 Guide groove 14,24,34,54 Tensile spring C Cartridge D Magneto-optical disk M Bias magnet unit M1 Bias yoke M2 E core M3 Bias magnet Coil P0 Drive pin S1 Shutter S2 Protrusion

Claims (2)

[Claims] 1. A bias magnet unit including a bias magnet coil, a bias yoke, etc., and a shutter opening / closing mechanism in which a magneto-optical disk cartridge is loaded and incorporated therein to open the shutter of the cartridge,
In a magneto-optical disk drive device for recording / erasing or reading data, a bias magnet unit having a bias yoke similar in shape to the bias magnet coil and a guide groove for slidingly guiding an opening / closing member of the shutter to open / close the shutter. And a shutter opening / closing mechanism for controlling the magneto-optical disk drive. 2. The shape of the guide groove is such that the intersection of the center line of the bent portion where the oblique portion and the vertical descending portion of the guide groove intersect,
The magneto-optical disk drive device according to claim 1, wherein the magneto-optical disk drive device is located below the upper end of the bias yoke.