JP2882959B2 - Magneto-optical disk recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk recording / reproducing apparatus in which a recording medium is housed in a cartridge.
In particular, it relates to the cartridge loading mechanism.

[0002]

2. Description of the Related Art Mini discs (MD) known as rewritable magneto-optical discs include a pre-mastered mini disc and a recordable mini disc. The premastered mini disc is a read-only disc, in which information is recorded by pits, and the information is reproduced by reflected light of a laser spot from an optical pickup.

A recordable mini-disc has a recordable area outside the pit information recording area on the inner peripheral side. The recordable area has a user's stock area (U-TOC) and a program area. Instead of having no pits, a groove (groove) that guides the track is dug, and information is recorded along this groove. I do.

[0004] The groove undulates in the waveform, and the average frequency of the signal generated by the undulation (wobble) is 22.
The rotation of the disk is controlled to be 05 kHz.
Further, the absolute time (address information) from the recording start position is FM-modulated and recorded in the wobble.

[0005] Recording is performed by magnetization of a magnetic film. That is, the magnetic film is heated by a laser spot to a temperature higher than the Curie point, and a magnetic field of a magnetic head which reverses according to a signal is applied thereto. The rotation direction of the plane of polarization of the reflected light of the laser beam differs depending on the direction of magnetization of the magnetic film, and information is reproduced by detecting a change in the plane of polarization of the reflected light of the laser spot.

[0006] Such a mini disk is housed in a cartridge, and recording and reproduction are performed by mounting the cartridge in a recording and reproduction unit. The recording / reproducing unit includes a turntable for rotating a disk, an optical pickup, a magnetic head, and the like, and is supported by a floating chassis so as to be shielded from external vibration.

The cartridge containing the pre-mastered mini-disc has a dent formed in a predetermined portion. By detecting the presence or absence of the dent, the distinction between the recordable and the pre-mastered is discriminated, and when the recordable mini-disc is loaded. The magnetic head is brought into contact with the disk, and when the premastered mini disk is loaded, the magnetic head is kept in non-contact with the disk.

In a conventional mini-disc recording / reproducing apparatus for recording / reproducing such a mini-disc, a member for clamping a cartridge to a positioning member is attached to a portion of a loading mechanism supported by a main body chassis during recording / reproducing. However, since the recording / reproducing unit is not completely separated from the main body chassis, there is an adverse effect on the vibration resistance.

Further, the clamp member attached to the holder for holding the cartridge has problems such as a large frictional resistance when the cartridge is pushed into the holder, an increase in a loading load, and a frictional damage to the cartridge.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide good seismic resistance by completely separating a recording / reproducing unit from a main body chassis. An object of the present invention is to provide a magneto-optical disk recording / reproducing apparatus having the same.

[0011]

The magneto-optical disk recording / reproducing apparatus of the present invention comprises an optical pickup for irradiating a laser spot on a signal recording track of the magneto-optical disk, a spindle motor for rotating the magneto-optical disk, and a turntable. In a magneto-optical disk recording / reproducing apparatus which is mounted on a floating chassis and mounts the cartridge at a predetermined position with respect to the turntable when the cartridge containing the magneto-optical disk is pushed into the holder and the holder is lowered, the cartridge is rotated to the floating chassis. A pressure arm movably supported and biased by a spring is connected to the holder so that the holder is pressed against the floating chassis, and a distance from a rotation center is farther than a connection point of the pressure arm with the holder. The cartridge is positioned on the floating chassis by the leaf spring attached to the Those configured to be press member.

[0012]

According to the magneto-optical disk recording / reproducing apparatus of the present invention, when the holder descends, the pressing arm rotates following the holder, but the rotating arm of the leaf spring for clamping the cartridge is connected to the pressing arm. The stroke of the leaf spring is larger than the stroke of the holder because it is larger than the pivot arm at the connection point of the holder, so that even if the contact pressure between the leaf spring and the cartridge when the cartridge is pushed into the holder is extremely small or is zero, there is sufficient clamping for the cartridge. Pressure can be applied by the leaf spring.

Further, the pressure arm to which the leaf spring is attached is supported by the floating chassis, so that the recording / reproducing unit can be completely separated from the main body chassis during recording / reproducing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mini disc recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a main part of a mini disc recording / reproducing apparatus according to an embodiment of the present invention. In the figure, reference numeral 2 denotes a holder that holds the mini-disc cartridge and moves up and down. The rods 2a, 2a,... Erected on the left and right sides of the holder 2 pass through the vertically long holes 6 of the guide plate fixed to the main body chassis (not shown) and the cam grooves 7 of the slider. Although the figure shows the elongated hole 6 and the cam groove 7 for one of the rods 2a, the same applies to the other rods. The slider is driven back and forth by a drive mechanism (not shown) to move the holder 2 up and down.

The mini disc cartridge 1 pushed into the holder 2 by the loading tray 20 shown in FIG. 2 includes a mini disc cartridge containing a recordable mini disc and a mini disc cartridge containing a premastered mini disc. The one housing the recordable mini-disc has shutters on both upper and lower sides. The one that houses the pre-mastered mini-disc has a shutter on the lower surface and a recess on the lower surface.
a is provided.

An optical pickup moving table 5 supporting the optical pickup 4 is guided by a guide rod fixed to the floating chassis 3 and is provided with a pickup feed motor (not shown).
Is sent left and right.

The floating chassis 3 has dampers (not shown) fitted in holes provided at four corners, and is supported by the main body chassis via the dampers. The pressure arms 9, 9 are rotatably supported by the floating chassis 3 and are torsion coil springs 10, 1.
It is biased counterclockwise by 0.

The pressure arms 9, 9 are connected to the holder 2 via shafts 9a, 9a. When the holder 2 is lowered by the cam groove 7, the holder 2 is pressed against the floating chassis 3. In this state, the shaft 2a is separated from the elongated hole 6 and the cam groove 7. Leaf springs 11, 1 for pressing the cartridge against a positioning member (not shown) are provided at the distal ends of the pressing arms 9, 9.
1 is fixed.

A turntable 8 is fixed to a rotating shaft of a spindle motor fixed to the floating chassis 3.
A bracket 12 is fixed to the optical pickup moving table 5, and the bracket 12 supports a magnetic head arm 13 and an identification cam 17 in a freely rotatable manner. The magnetic head arm 13 and the identification cam 17 are urged counterclockwise by torsion coil springs 14 and 18, respectively.

A magnetic head 16 is attached to the tip of a leaf spring 15 fixed to the magnetic head arm 13. The identification lever 19 is rotatably supported by the holder 2 via the shaft 2b and is urged counterclockwise by a torsion coil spring (not shown).

Next, the operation of the above embodiment will be described with reference to FIGS. FIG. 2 shows a state where the cartridge 1 is being pushed into the holder 2. At this time, the holder 2 is raised, and the pressing arm 9 is rotating clockwise. The magnetic head arm 13 is also pushed up by the holder 2 and is rotated clockwise.

The identification lever 19 does not rotate in the direction of the identification cam 17 and is separated from the identification cam 17. Identification cam 17
Is rotated counterclockwise until the projection comes into contact with the projection 13a of the magnetic head arm 13.

When the cartridge 1 is pushed into the holder 2, its shutter is opened. FIG. 3 shows a state in which the cartridge containing the premastered mini disc is pushed into the holder 2. In this case, the protrusion of the identification lever 19 enters the recess 1a of the cartridge 1 and
Does not rotate. Therefore, the identification cam 17 does not rotate.

FIG. 5 shows a state where the holder 2 is lowered from the above state. The leaf spring 11 descends over a distance larger than the moving distance of the holder 2 to press the cartridge 1 against the positioning member, and the inner peripheral portion of the disk is attracted to the turntable 8 by magnetic force.
To be rotated.

The protrusion 13a of the magnetic head arm 13
Abuts on the identification cam 17, the rotation of the magnetic head arm 13 is prevented, and the magnetic head 16 is kept away from the mini disk. Further, the holder 2 is provided with a magnetic head arm 13.
, The identification lever 19 remains separated from the identification cam 17. In this way, the member supported by the optical pickup moving table 5 is separated from the other members, and enters a reproducible state in which the optical pickup 4 is smoothly fed.

FIG. 4 shows a state in which the cartridge 1 containing the recordable mini-disc has been pushed into the holder 2. In this case, the protrusion of the identification lever 19 is pushed by the cartridge 1 and the identification lever 19 rotates. Identification cam 17
Is rotated by the identification lever 19 in the clockwise direction.

FIG. 6 shows a state where the holder 2 is lowered from the above state. The leaf spring 11 descends over a distance larger than the moving distance of the holder 2 to press the cartridge 1 against the positioning member, and the inner peripheral portion of the disk is attracted to the turntable 8 by magnetic force.
To be rotated.

The protrusion 13a of the magnetic head arm 13
Enters the recess 17a of the identification cam 17, the magnetic head arm 13 rotates more counterclockwise than in the case shown in FIG. 5, and the magnetic head 16 comes into pressure contact with the mini disk. Further, the identification cam 17 is rotated in a direction away from the identification lever 19 by the projection 13a.

Even if the magnetic head arm 13 stops when the projection 13a enters the bottom of the recess 17a of the identification cam 17, the holder 2
Further descends and separates from the magnetic head arm 13. In this way, the members supported by the optical pickup moving table 5 are separated from other members except for the magnetic head 16, so that the optical pickup can be smoothly fed.

In this state, a magnetic field modulated by a recording signal is applied to the magnetic film of the disk heated by the laser spot of the optical pickup 4 by the magnetic head 16 to record information on the disk.

At the time of unloading the cartridge, the holder 2 is raised, and the optical pickup 4 is sent to the home position on the inner peripheral side of the disk. When the holder 2 is raised, the identification cam 17 is moved by the elasticity of the torsion coil spring 18 as shown in FIG.
To the position shown in FIG. When a recordable mini-disc is mounted, the detection lever 19 and the identification cam 17 interfere with each other. However, since the detection lever 19 has a smooth surface facing the identification cam 17, the identification cam 17 is Torsion coil spring 18
The optical pickup moving base 5 is rotated so as to retreat from the detection lever 19 against the elasticity of the optical pickup 5 and is not hindered.

FIG. 7 shows this state. In this way, the optical pickup can be moved immediately regardless of the position of the optical pickup at the time of unloading,
The unloading operation can be performed quickly.

[0033]

According to the magneto-optical disk recording / reproducing apparatus of the present invention, since the member for clamping the magneto-optical disk is supported by the floating chassis, the recording / reproducing unit is completely separated from the main body chassis during recording / reproducing. And good vibration resistance can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a magneto-optical disk recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing the operation of the mini disc recording / reproducing apparatus.

FIG. 3A is a side view showing an operation of the mini disc recording / reproducing apparatus, and FIG. 3B is a partial plan view showing an operation of the mini disc recording / reproducing apparatus.

FIG. 4A is a side view showing the operation of the mini-disc recording / reproducing apparatus, and FIG. 4B is a partial plan view showing the operation of the mini-disc recording / reproducing apparatus.

FIG. 5 is a side view showing the operation of the mini disc recording / reproducing apparatus.

FIG. 6 is a side view showing the operation of the mini disc recording / reproducing apparatus.

FIG. 7 is a partial plan view showing the operation of the mini disc recording / reproducing apparatus.

[Description of Signs] 1 Mini disk cartridge 2 Holder 2a Rod 3 Floating chassis 4 Optical pickup 5 Optical pickup moving base 6 Vertical hole 7 Cam groove 8 Turntable 9 Pressure arm 9a Axis 10 Torsion coil spring 11 Leaf spring 12 Bracket 13 Magnetic Head arm 14 Torsion coil spring 15 Leaf spring 16 Magnetic head 17 Identification cam 18 Torsion coil spring 19 Identification lever 20 Loading tray

Claims (1)

(57) [Claims] An optical pickup for irradiating a laser spot on a signal recording track of a magneto-optical disk, a spindle motor and a turntable for rotating the magneto-optical disk are supported by a floating chassis, and a cartridge containing the magneto-optical disk is a holder. In the magneto-optical disk recording / reproducing apparatus in which the cartridge is mounted at a predetermined position with respect to the turntable by being pushed into the holder and lowered, the pressure arm which is rotatably supported by the floating chassis and biased by a spring is provided. The holder was pressed against the floating chassis by being connected to the holder, and the cartridge was provided on the floating chassis by a leaf spring attached at a position farther from the center of rotation than the connection point of the pressure arm with the holder. Magneto-optical disk recording / reproducing apparatus configured to be pressed against positioning member .