JPH06101154B2 - Magneto-optical recording / reproducing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to recording and / or reproducing and / or recording of information by causing a light beam and a magnetic field to cooperate with a magneto-optical recording medium which is an information recording medium. The present invention relates to a magneto-optical recording / reproducing device for erasing.

Although various forms such as a disk shape and a card shape can be considered as the magneto-optical recording medium, a disk-shaped recording medium (hereinafter referred to as a magneto-optical disk) will be described below as an example.

[Prior Art] A magneto-optical disk is formed by forming a magnetic thin film having an easy axis of magnetization perpendicular to the film surface on a substrate and recording information by changing the magnetization direction of the magnetic thin film. At the time of recording, first, the magnetization direction of the magnetic thin film is aligned in one direction in advance, and a laser beam digitally modulated according to an information signal is applied while applying a bias magnetic field in the opposite direction to the magnetization direction. To do. Then, the temperature of the irradiated portion of the laser beam rises and the coercive force decreases, and the magnetic field is magnetized in the opposite direction to the surroundings due to the influence of the bias magnetic field, and a magnetization pattern corresponding to information is formed. The information thus recorded can be read out optically by irradiating the medium with a low-power unmodulated beam by using the well-known magneto-optical effect. Further, the recorded information can be erased by applying a magnetic field whose direction is opposite to that of the bias magnetic field at the time of recording.

1 (a) and 1 (b) are side sectional views showing a conventional magneto-optical recording / reproducing apparatus, FIG. 1 (a) is a drawing when a disc cartridge is inserted, and FIG. FIG. 8B is a diagram when the magneto-optical disk is clamped by the spindle motor.

In the figure, reference numeral 102 is a disk cartridge having a magneto-optical disk housed therein. Disk cartridge 102
A holder 107 for holding the disk cartridge 102 moves along an L-shaped guide hole 122 provided in the side plate 121, and carries the disk cartridge 102 from the position shown in FIG. 1A to the position shown in FIG.

An optical head 106 is driven in the radial direction of the disk by a drive mechanism (not shown) provided on the head frame 108.
A turntable 109 is rotated by a spindle motor provided on the head frame 108.

In the figure, 103 is a bias magnet and 104 is a clamp retainer. Bias magnet 103 and clamp foot 104
Is held by a holding member 105, and the holding member 105 is vertically movable along a linear guide hole 123 provided in the side plate 121.

In this configuration, when the holder 107 moves in the horizontal direction and then starts descending, the holding unit 105 starts descending and
Ascending to the position shown in FIG. 6B, the clamp retainer 104 provided on the holding member 105 presses the disc in the disc cartridge 102 against the turntable 109 to clamp it.

[Problems to be Solved by the Invention] Magneto-optical disks are rewritable as is well known, and high-density recording is possible. Therefore, they are expected as an alternative to magnetic disks. , At least the full-height size of a 1 / 4-inch disk unit (height 8
2mm, width 146mm, depth 203 ~ 206mm), the magneto-optical disk device must be miniaturized.

1 (a) and 1 (b) show the main constituent elements of the magneto-optical disk device, but there are other parts such as a printed circuit board that require a considerable space, and in order to reduce the size to the above-mentioned full height size, Not to mention miniaturization of each unit and each part, it is necessary to eliminate wasted space as much as possible.

In FIG. 1A, the position of the holding member 105 is set so that the lower end of the clamp presser 104 is located above the insertion path of the disc cartridge 102 to be inserted.
Therefore, the bias magnet 103, the holding member 105, and the holder 107
The space between and requires an unnecessarily large space, but this space cannot be used for other purposes because the bias magnet 103 and the holding member 105 move up and down.

It is an object of the present invention to provide a magneto-optical recording / reproducing device which can minimize the useless space in the device and make the device thin.

[Means for Solving the Problems] According to the present invention, in order to achieve the above object, in a magneto-optical recording / reproducing apparatus having an insertion path of the recording medium in a direction along a recording surface of the information recording medium, Clamping means for clamping the recording medium when the recording medium is loaded, magnetic field generating means for applying a magnetic field to the recording medium, holding member for holding both the clamping means and the magnetic field generating means, and the holding member And a moving unit that is mounted on the holding member and moves the clamping unit in the clamping direction with respect to the holding member, and the holding member is retracted from the insertion path when the recording medium is loaded, and the loading operation of the recording medium is performed. The holding member is brought close to the recording medium in conjunction with the movement of the holding means, and the moving means moves the clamping means with respect to the holding member in association with the approach operation. There is provided a magneto-optical recording / reproducing device, which is adapted to be moved toward a recording medium.

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

2 (a) and 2 (b) are side sectional views showing an embodiment of the magneto-optical recording / reproducing apparatus of the present invention, and FIG. 2 (a) is a drawing when a disk cartridge is inserted, Figure 2 (b)
[Fig. 4] is a diagram when a magneto-optical disc is clamped by a spindle motor. In these figures, members having the same functions as those in FIGS. 1A and 1B are designated by the same reference numerals.

The difference between the device of the embodiment of the present invention shown in FIG. 2 and the conventional device shown in FIG. 1 is that the disc surface of the clamp presser 104 and the holding member 105 in FIGS. 1 (a) and 2 (a) is different. It is a positional relationship in the direction perpendicular to the above. Hereinafter, this will be described in detail.

In the conventional example of FIG. 1, the moving stroke S ₁ of the holding member 105 and the bias magnet 103 is determined by the following equation.

S ₁ = a−td + b (1) Here, a is the distance between the upper surface of the turntable 109 and the disk pressing surface of the clamp presser 104 when retracted (FIG. 1A). b is the distance between the holding member 105 and the upper disc 104a of the clamp retainer 104 when the disc is clamped (FIG. 1 (b)), that is, the play between the retaining member 105 and the clamp retainer 104. td is the thickness of the disc.

Further, in the embodiment of the present invention shown in FIG. 2, the moving stroke S ₂ of the holding member 105 and the bias magnet 103 is determined by the following equation.

S ₂ = a-td-c (2) Here, c is the distance between the holding member 105 and the lower disc 104 b of the clamp foot 104 when the disc is clamped (FIG. 2 (b)). This is the amount of movement of the clamp retainer 104 with respect to the holding member 105.

On the other hand, S _C is the movement stroke of the clamp retainer, since given by _{S C = a-td ····· (} 3), (1) formula, (2) and (3), S ₂ < The relationship S _C <S ₁ (4) holds. That is, in the configuration of the conventional example shown in FIG. 1, the clamp presser 104 and the holding member 105 are not in contact with each other when the disc is clamped, so that the clamp presser 104 is supported with respect to the holding member 105 in a vertical play. . Therefore, it is necessary to make the stroke of the holding member 105 longer than the stroke of the clamp retainer 104 by the amount of backlash. On the other hand, in the configuration of the embodiment of the present invention shown in FIG. 2, the stroke of the holding member 105 can be made shorter than the stroke of the clamp retainer 104. That is, S ₁ −S ₂ = b + c (5) As shown in FIG. 2, the holding member 105 moves the clamp presser 104 further downward, so that the stroke difference (b + c) Holding member 105 and bias magnet 1
The movement stroke of 03 is shortened and the wasted space can be eliminated accordingly.

The means by which the holding member 105 moves the clamp retainer 104 downward will be described in more detail below with reference to FIGS. 3 and 4.

3 (a) and 3 (b) are cross-sectional views of the above-described embodiment of the present invention seen from the insertion direction of the disc cartridge, and FIG. 3 (a) shows the disc cartridge 102 when it is inserted into the apparatus. FIG. 3B is a diagram when the disc is clamped by the spindle motor. 4 (a) and 4 (b) are external perspective views of the respective devices at the time of FIGS. 3 (a) and 3 (b).

In FIGS. 3A and 4A, the disk cartridge 102 is supported by the holder 107 and is carried on the turntable 109 by a loading mechanism (not shown). At this time, the clamp retainer 104 and the holding member 105 are retracted upward so as not to hit the holder 107.

At this time, the clamp retainer 104 is pushed upward by the pair of levers 111. That is, the lever 111 is supported in a swingable state around a lever shaft 113 fixed by a lever base 112 provided on the holding member 105.
Then, the lever 111 is moved to the third position by the torsion spring 114.
The lower disk 104b of the clamp retainer 104 is always brought into contact with the lower end of the holding member 105 in the state of FIG.

After that, the holder 107 descends, and the holding member 105 also descends so as to follow it. The disc is placed on the turntable 109 by lowering the holder 107. After that, since the holding member 105 further descends, one end of the lever 111 comes into contact with the holder 107, the lever 111 swings around the lever shaft 113, and the other end of the lever 111 exerts an upward bias on the clamp retainer. When released, the clamp retainer 104 descends relative to the holding member 105.

Since a permanent magnet (not shown) is provided inside the clamp retainer 104, in the state of FIG. 3B, the permanent magnet is attracted to an iron piece provided at the tip of the spindle motor shaft (not shown). , Press the disk onto the turntable 109 and clamp it. At this time, since the lever 111 and the holding member 105 do not contact the clamp retainer 104, the disc and the clamp retainer 104 can rotate at high speed.

When the clamp is released, the holding member 105 rises and the clamp holder 115 fixed to the holding member 105 lifts the upper disc 104a of the clamp retainer 104. here,
Clamp holder to reduce the clamp release force
A small protrusion (not shown) is provided on one part of 115, and this part is first the upper disc 104 of the clamp clamp 104.
It is configured to contact a.

The present invention can be variously modified in addition to the above-described embodiments, and the present invention includes such modifications as long as the modifications do not deviate from the description of claim 1. .

[Effects of the Invention] As described above, according to the present invention, only the clamping means can be further moved with respect to the holding member, even though the magnetic field generating means and the clamping means are moved by the same holding member. The moving stroke of the holding member can be shortened, and thus the device can be made very thin.

[Brief description of drawings]

FIGS. 1A and 1B are side sectional views showing a conventional magneto-optical recording / reproducing apparatus. 2 (a) and 2 (b) are side sectional views showing an embodiment of the magneto-optical recording / reproducing apparatus of the present invention. 3 (a) and 3 (b) are sectional views showing an embodiment of the magneto-optical recording / reproducing apparatus of the present invention as seen from the insertion direction of the disc cartridge. 4 (a) and 4 (b) are external perspective views of an embodiment of the magneto-optical recording / reproducing apparatus of the present invention. 102: disk cartridge, 103: bias magnet, 104: clamp holder, 105: holding member. 106: Optical head. 109: Turntable.

Claims (1)

[Claims] 1. A magneto-optical recording / reproducing apparatus having an insertion path for the recording medium in a direction along a recording surface of an information recording medium, wherein the recording medium is clamped to clamp the recording medium when the recording medium is loaded. A magnetic field generating means for applying a magnetic field, a holding member for holding both the clamping means and the magnetic field generating means, and the clamping means mounted on the holding member and moved in the clamping direction with respect to the holding member. Moving means, the holding member is retracted from the insertion path when the recording medium is loaded, and the holding member is brought close to and close to the recording medium in association with a loading operation of the recording medium. A magneto-optical device characterized in that the moving means is adapted to move the clamping means toward the recording medium with respect to the holding member in conjunction with the operation. Recording / playback device.