JP3460050B2 - 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 having a recording medium housed in a cartridge,
In particular, it relates to a lifting mechanism for the magnetic head.

[0002]

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

The 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 tok area (U-TOC) and a program area. Instead of a pit, a groove for guiding the track is dug, and information is recorded along this groove. To do.

The groove is undulated in a waveform, and the average frequency of a signal generated by the undulation (wobble) is 22.
The rotation of the disc is controlled so that the frequency becomes 05 kHz.
Further, the absolute time (address information) from the recording start position is FM-modulated and recorded in this wobble.

Recording is performed by the magnetization of the magnetic film. That is, when a magnetic film is heated to a Curie point or higher by a laser spot, a magnetic field of a magnetic head which inverts according to a signal is applied thereto, and then cooled, a signal is recorded on the magnetic film as a change in the magnetization direction. Information is reproduced by detecting a change in the plane of polarization of the reflected light of the laser spot, because the rotation direction of the plane of polarization of the reflected light of the laser differs depending on the direction of magnetization of the magnetic film.

Such a mini disk is housed in a cartridge, and the cartridge is mounted in a recording / reproducing unit for recording / reproducing. The recording / reproducing unit is composed of a turntable for rotating a disk, an optical pickup, a magnetic head, etc., and is supported by a floating chassis so as to be isolated from external vibration.

The cartridge containing the pre-mastered mini disc has a recess formed in a predetermined portion. By detecting the presence or absence of the recess, 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 disk recording / reproducing apparatus for recording / reproducing such a mini disk, a recording / reproducing apparatus in which a member for clamping a cartridge to a positioning member is attached to a portion supported by a chassis of a main body of a loading mechanism. 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, when the clamp member is attached to the holder for holding the cartridge, there is a problem that the frictional resistance when pushing the cartridge into the holder is large and the loading load is increased and the cartridge is damaged by friction.

Further, regarding an elevating mechanism for elevating the magnetic head that moves together with the optical pickup, the one that supports the elevating mechanism of the magnetic head in a portion different from the optical pickup moving base is a portion that slides as the optical pickup moves. This causes vibrations, and if the magnetic head lifting mechanism is provided on the optical pickup moving base, a drive source other than the loading mechanism must be provided on the optical pickup moving base, increasing the required space and manufacturing costs. There is the problem of bringing in highs.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and an object of the present invention is to achieve good seismic resistance by completely separating the recording / reproducing unit from the main body chassis. In addition, the elevating mechanism of the magnetic head has no portion that slides with the movement of the optical pickup, and further, the elevating mechanism of the magnetic head is driven by the drive source of the loading mechanism, thereby achieving space saving and cost reduction. Another object is to provide a magneto-optical disk recording / reproducing device.

[0012]

A magneto-optical disk recording / reproducing apparatus of the present invention comprises an optical pickup for irradiating a signal recording track of the magneto-optical disk with a laser spot, a spindle motor for rotating the magneto-optical disk, and a turntable. A magnetic head for slidingly contacting the magneto-optical disk and applying a magnetic field to the laser spot is supported by a floating chassis, and a cartridge accommodating the magneto-optical disk is pushed into the holder and the holder is lowered to move the cartridge to the turntable. In a magneto-optical disk recording / reproducing apparatus mounted at a predetermined position, a magnetic head arm supporting a magnetic head is rotatably supported on an optical pickup moving base, and is biased by a spring in a magnetic head descending direction. The identification lever that is rotated by the cartridge that stores The holder is rotatably supported, and an identification cam for controlling the rotation of the magnetic head arm is rotatably supported on the optical pickup moving base, and is biased by a spring in a direction in which it is pressed against the identification lever. In the raised position, the magnetic head arm is pushed up by the holder. When the identification lever is rotated by the cartridge when the cartridge is pushed into the holder, the identification cam is rotated by the identification lever and the magnetic head arm is moved to the magnetic head arm as the holder descends. While the pin provided enters the recess of the identification cam, the magnetic head arm rotates to press the magnetic head against the magneto-optical disk, and the identification cam rotates in the direction away from the identification lever, so that the cartridge is placed in the holder. If the identification lever is not rotated by the cartridge when it is pushed in, the identification cam will not rotate and the magnetic head will drop when the holder is lowered. In which pins provided on the arm is configured such that rotation of the magnetic head arm without Irikoma the recess of the identification cam is kept in a state of the magnetic head is stopped away from the magneto-optical disk.

In the magneto-optical disk recording / reproducing apparatus, the surface of the identification lever facing the identification cam is formed smoothly so that the identification cam retracts with respect to the identification lever when the identification lever and the identification cam interfere with each other. It is configured in.

[0014]

The magnetic head arm supported by the optical pickup moving base is pushed up by the holder at the time of unloading the cartridge, and when the holder descends and rotates following the holder, it is stopped by the identification cam. Get away from.

The identification cam supported by the optical pickup moving base comes into contact with the identification lever supported by the holder in the holder raising position, but separates from the identification lever when the holder descends during loading.

In this way, the member supported by the optical pickup moving base can be separated from other members during recording / reproduction, so that there is no sliding contact portion with the movement of the optical pickup, and the adverse effects such as vibration generation can be eliminated. it can.

Further, in the cartridge unloading operation, the holder moves up and the optical pickup moves to the home position. However, since the surface of the identification lever facing the identification cam is formed smoothly, if the identification lever and the identification cam interfere with each other, the identification cam will be removed. Since it rotates so as to retreat against the elasticity of the spring, it does not hinder the loading operation, and it is possible to immediately start raising the holder and moving the optical pickup regardless of the position of the optical pickup, and promptly perform the unloading operation. Can be done.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mini disk 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 disk recording / reproducing apparatus according to an embodiment of the present invention. In the figure, 2 is a holder for holding a mini disk cartridge and moving up and down. The rods 2a, 2a ... Standing on the left and right sides of the holder 2 are inserted through the vertically long holes 6 of the guide plate and the cam groove 7 of the slider fixed to the body chassis (not shown). Although the drawing shows the vertically 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 driving mechanism (not shown) to move the holder 2 up and down.

The mini disk cartridge 1 pushed into the holder 2 by the loading tray 20 shown in FIG. 2 includes a recordable mini disk and a premastered mini disk. Shutters are provided on both the upper and lower sides of the recordable mini disc. The one that houses the pre-mastered mini disc has a shutter on the bottom surface and has a recess 1 on the bottom 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 a pickup feed motor (not shown).
Is sent to the left and right.

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

The pressure arms 9, 9 are connected to the holder 2 via shafts 9a, 9a, and when the holder 2 is lowered by the cam groove 7, the holder 2 is brought into pressure contact with the floating chassis 3. In this state, the shaft 2a separates from the vertically long hole 6 and the cam groove 7. Leaf springs 11 and 1 for pressing the cartridge to a positioning member (not shown) are provided at the tips of the pressing arms 9 and 9.
1 is fixed.

A turntable 8 is fixed to the rotary 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 rotatably supports a magnetic head arm 13 and an identification cam 17. The magnetic head arm 13 and the identification cam 17 are biased 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 a shaft 2b and is biased 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 the cartridge 1 being pushed into the holder 2. At this time, the holder 2 is raised and the pressure arm 9 is rotated clockwise. Further, the magnetic head arm 13 is also pushed up by the holder 2 and rotated clockwise.

Further, the identification lever 19 is separated from the identification cam 17 without rotating in the direction of the identification cam 17. Identification cam 17
Rotates counterclockwise until the protrusion comes into contact with the protrusion 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 the identification lever 19
Does not rotate. Therefore, the identification cam 17 also does not rotate.

A state in which the holder 2 is lowered from the above state is shown in FIG. The leaf spring 11 descends over a distance larger than the movement distance of the holder 2, the cartridge 1 is pressed against the positioning member, and the inner peripheral portion of the disk is attracted to the turntable 8 by magnetic force, and the mini disk is rotated by the turntable 8.
Will be rotated by.

Further, the projection 13a of the magnetic head arm 13
Comes into contact with the identification cam 17, the rotation of the magnetic head arm 13 is blocked, and the magnetic head 16 is kept away from the mini disk. Further, the holder 2 has a magnetic head arm 13
Away from the identification lever 19, the identification lever 19 remains away from the identification cam 17. In this way, the member supported by the optical pickup moving base 5 is separated from the other members to be in 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 disk is 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 pushed by the identification lever 19 and rotated clockwise.

The state where the holder 2 is lowered from the above state is shown in FIG. The leaf spring 11 descends over a distance larger than the movement distance of the holder 2, the cartridge 1 is pressed against the positioning member, and the inner peripheral portion of the disk is attracted to the turntable 8 by magnetic force, and the mini disk is rotated by the turntable 8.
Will be rotated by.

Further, the projection 13a of the magnetic head arm 13
Goes into the recess 17a of the identification cam 17 and the magnetic head arm 13 pivots counterclockwise more 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 by the protrusion 13a in a direction away from the identification lever 19.

Even if the magnetic head arm 13 is stopped, the holder 2 is inserted into the bottom of the recess 17a of the identification cam 17 by the protrusion 13a.
Moves further down and moves away from the magnetic head arm 13. In this manner, the members supported by the optical pickup moving base 5 are separated from the other members except the magnetic head 16 so that the optical pickup can be sent smoothly.

In this state, the magnetic field modulated by the 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.

When the cartridge is unloaded, the holder 2 is raised and the optical pickup 4 is sent to the home position on the inner circumference side of the disc. When the holder 2 moves up, the identification cam 17 is moved by the elastic force of the torsion coil spring 18 as shown in FIG.
Rotate counterclockwise to the position shown in. When the recordable mini disc is mounted, the detection lever 19 and the identification cam 17 interfere with each other. However, since the surface of the detection lever 19 facing the identification cam 17 is formed smoothly, the identification cam 17 is not detected by the detection lever 19. Pressed by the torsion coil spring 18
The optical pickup moving base 5 is rotated so as to retract from the detection lever 19 against the resilience of the optical pickup.

The state is shown in FIG. In this way, the optical pickup can be moved immediately at any position during unloading.
It is possible to quickly perform the unloading operation.

[0037]

According to the magneto-optical disk recording / reproducing apparatus of the present invention, the member supported by the optical pickup moving base can be separated from other members during recording / reproducing, so that the portion that slides along with the movement of the optical pickup. It is possible to eliminate the adverse effects such as the occurrence of vibration.

Further, since the surface of the identification lever facing the identification cam is formed smoothly, when the identification lever and the identification cam interfere with each other, the identification cam rotates so as to move backward against the elastic force of the spring, which hinders the loading operation. Instead, the holder ascent and the movement of the optical pickup can be immediately started regardless of the position of the optical pickup, and the unloading operation can be performed quickly.

[Brief description of 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 an operation of the mini disc recording / reproducing apparatus.

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

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

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

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

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

[Explanation of symbols]

1 Mini disk cartridge 2 holder 2a rod 3 floating chassis 4 Optical pickup 5 Optical pickup moving table 6 vertical holes 7 Cam groove 8 turntables 9 Pressure arm 9a axis 10 torsion coil spring 11 leaf spring 12 brackets 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

Continuation of the front page (56) Reference JP-A-6-180955 (JP, A) JP-A-6-180915 (JP, A) JP-A-6-150436 (JP, A) JP-A-5-334762 (JP , A) JP 5-205423 (JP, A) JP 4-268229 (JP, A) JP 4-162236 (JP, A) JP 4-13254 (JP, A) JP 61-29438 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 21/12

Claims (2)

(57) [Claims] 1. An optical pickup for irradiating a signal recording track of a magneto-optical disc with a laser spot, a spindle motor and a turntable for rotating the magneto-optical disc, and a magnet for slidingly contacting the magneto-optical disc to apply a magnetic field to the laser spot. The head and is supported by the floating chassis,
In a magneto-optical disk recording / reproducing apparatus in which a cartridge containing a magneto-optical disk is pushed into a holder and the holder is lowered to mount the cartridge at a predetermined position with respect to the turntable, a magnetic head arm supporting a magnetic head is optically picked up. The magnetic head is rotatably supported and urged by a spring in the downward direction of the magnetic head, and an identification lever rotated by a cartridge containing a recordable magneto-optical disk is rotatably supported by the holder. An identification cam that controls the rotation of the head arm is rotatably supported on the optical pickup moving base and is urged by a spring in a direction in which it is pressed against the identification lever. When the holder is raised, the magnetic head arm is pushed up by the holder. The identification lever is rotated by the cartridge when the cartridge is pushed into the holder. Then, the identification cam is rotated by the identification lever, and as the holder descends, the pin provided on the magnetic head arm enters the recess of the identification cam and the magnetic head arm rotates to press the magnetic head against the magneto-optical disk. A pin provided on the magnetic head arm when the identification cam is rotated in a direction away from the identification lever and the identification cam is not rotated unless the identification lever is rotated by the cartridge when the cartridge is pushed into the holder. Is a magneto-optical disk recording / reproducing device configured so that the rotation of the magnetic head arm is stopped and the magnetic head is kept away from the magneto-optical disk without entering into the recess of the identification cam. 2. The magneto-optical device according to claim 1, wherein a surface of the identification lever facing the identification cam is formed smoothly so that the identification cam retracts with respect to the identification lever when the identification lever and the identification cam interfere with each other. Disk recording / playback device.