JPH0611192U - Magneto-optical recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a magneto-optical recording / reproducing apparatus which can use a relatively large magnetic head and is hardly affected by an assembly error or the like. A magnetic head movement restricting mechanism 20 for stopping the magnetic head arm 5 moving radially outward from the center of the disk 7 in front of the lead-out area 8 on the outer peripheral portion of the disk is provided. The magnetic head arm 5 moving radially outward from the center of the disk has a lead-out area 8
It is stopped in front, and only the optical pickup 6 reaches the lead-out area 8. Since the magnetic head that moves in the window of the cartridge does not reach the outer peripheral portion of the disk, there is no risk of interference with the window of the cartridge, and the magnetic head can be made larger accordingly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magneto-optical recording / reproducing device which can employ a relatively large magnetic head.

[0002]

[Prior art]

 In recent years, a magneto-optical recording / reproducing device has attracted attention. This is because the user-side recording has become possible for a read-only device typified by a compact disc.

FIG. 3 is a principle diagram of a main part of the magneto-optical recording / reproducing apparatus. A magnetic head 102 is arranged above a disk 101 rotated by a spindle motor 100, and an optical pickup 103 is arranged below the disk 101. , The optical pickup 103 is opposed to the magnetic head 102, and they are moved along the surface of the disk 101. The head driving device 104 and the feed motor 105 are moving means therefor.

When recording on the disc 101, the lower surface of the disc 101 is irradiated with a strong laser beam by the optical pickup 103 to locally raise the disc to the Curie temperature to erase the old magnetic recording. After the magnetic recording is erased, a new signal is recorded by the magnetic head 102. To reproduce the disc 101, a weak laser beam is applied to the disc 101 from the optical pickup 103. The reflected light is discriminated into "0" and "1" by the rotating action of the polarization plane of the return light generated corresponding to the N pole or the S pole of the magnetic recording (called the Kerr effect). Therefore, it becomes possible to reproduce the disc 101.

FIG. 4 is an exploded perspective view of the magneto-optical disk. The disk 101 is rotatably housed in a cartridge made of a plastic upper half 110 and a lower half 111. A window 110a for exposing the magnetic head 102 is formed in the upper half 110, and a window 111a for exposing the optical pickup 103 is formed in the lower half 111. These windows 110a and 111a are closed by the slide shutter 113 except when necessary.

In general, the magnetic head 102 is retracted to a position exceeding the thickness of the upper half 110, and is brought very close to the disc 101 after the disc 101 is mounted at a predetermined position and the slide shutter 113 is opened. Has been adopted. This is because the magnetic head 102 has improved recording characteristics as it approaches the disk 101.

[Problems to be solved by the device]

FIG. 5 is a plan view of a conventional magneto-optical disk cartridge, and FIG. 6 is a bottom view of the same. As shown in FIG. 6, the magnetic head 102 and the optical pickup 103 move in synchronization with the plane of the drawing to a position where the lead-out area 101a at the outermost periphery of the disk 101 is read. The optical pickup 103 shown by an imaginary line has a relatively large size, but does not contact the disc 101 and is apart from the front side of the drawing to some extent, so that the window 111a may be an opening through which light can pass. However, it is not necessary to enlarge the window 111a even if the window is large.

On the other hand, as shown in FIG. 5, since the magnetic head 102 shown by an imaginary line must be very close to the disk 101, the window 110a of the upper half 110 is provided with a large notch 110b. However, since the size of the cartridge is determined by the standard, the window 110a including the notch 110b cannot be made larger than a certain size, and the size of the window 110a may reduce the strength of the cartridge. . Therefore, the magnetic head 102 is made small, but as a result, the structure of the magnetic head 102 becomes complicated and precise, it becomes sensitive to external influences such as an assembly error, and proper maintenance of the apparatus becomes difficult. Therefore, an object of the present invention is to provide a magneto-optical recording / reproducing apparatus which can use a relatively large magnetic head and is less susceptible to an assembly error or the like.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is provided with a magnetic head movement restricting mechanism for stopping the magnetic head moving radially outward from the center of the disk in front of the lead-out area on the outer circumference of the disk. .

[0010]

[Action]

 The magnetic head moving radially outward from the center of the disc is stopped just before the read-out area on the outer circumference of the disc, and only the optical pickup reaches the read-out area on the outer circumference of the disc. Since the magnetic head that moves inside the window of the cartridge does not reach the outer periphery of the disk, there is no risk of interference with the window of the cartridge, and the magnetic head can be made larger accordingly.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of an essential part of a magneto-optical recording / reproducing apparatus according to the present invention. The magneto-optical recording / reproducing apparatus requires an upper magnetic head and a lower optical pickup as described in the section of the prior art. Is. FIG. 1 is a diagram showing a feed mechanism for these magnetic head and optical pickup. Two right and left brackets 2 and 2 are erected on a chassis 1, and a rail 3 is attached to these brackets 2 and 2. An optical pickup arm 4 is slidably mounted on the rail 3, and a magnetic head arm 5 is slidably mounted on the rail 3.

The optical pickup arm 4 is an arm for holding the optical pickup 6, and moves to a position of an imaginary line P, that is, an outermost lead-out area 8 of the disk 7 by a lead screw (feed screw) or the like not shown.

On the other hand, the magnetic head arm 5 is an arm for holding the magnetic head 9 and is movably attached to the rail 3, but the left and right eye plates (perforated plates) 11 of the optical pickup arm 4 are provided. It is movable only between 12 and is biased to one eye plate 12 by a spring 13. Further, a protrusion 21 is formed on the optical pickup arm 4, and the position of the protrusion 21 is regulated by a stopper block 22 on the upper right of the figure.

That is, the protrusion 21 and the stopper block 22 constitute a magnetic head movement restriction mechanism 20. Details of the magnetic head movement restricting mechanism 20 will be described in the next section of action.

The operation of the magneto-optical recording / reproducing apparatus and the magnetic head movement restricting mechanism having the above structure will be described below. In FIG. 1, the optical pickup arm 4 is moved in the arrow direction by a lead screw or the like. The magnetic head arm 5 also moves in the direction of the arrow in synchronization with the optical pickup arm 4.

2 (a) and 2 (b) are operation views of the magnetic head movement restricting mechanism of the present invention, in which the projecting portion 21 of the magnetic head arm 5 moving according to the arrow contacts the stopper block 22 ( FIG. 2A).

Further, when the optical pickup arm 4 moves in the direction of the arrow, as shown in FIG. 2B, the magnetic head arm 5 is prevented from moving by the stopper block 22, so that only the optical pickup arm 4 is read out. Move to area 8. Since the spring 13 contracts, even if the magnetic head arm 5 stops, the movement of the optical pickup arm 4 is not hindered.

When the optical pickup arm 4 is returned in the direction of the arrow, the spring 13 extends and returns to the state of FIG.

The reason why the state of FIG. 2B can be realized will be described below. The lead-out area 8 is a signal reading area, not a magnetic recording area. Therefore, only the optical pickup 6 needs to reach the lead-out area 8, and the magnetic head 9 should be stopped before that. This is the reason for realizing FIG. 2 (b).

As a result, the magnetic head 9 can be increased in size, so that the magnetic head 9 does not need to have a precise structure. Further, in the embodiment, since the magnetic head arm 5 is pressed against the optical pickup arm 4 by the spring 13, the magnetic head 9 and the optical pickup 6 can be kept in good synchronization as shown in FIG. That is, since the spring 13 reduces the backlash of the magnetic head 9 to zero, the positional accuracy is improved.

The stopper block 22 of the magnetic head movement restricting mechanism 20 may have any shape as long as it restricts the movement of the magnetic head 9.

[0022]

[Effect of device]

 As described above, the present invention is equipped with a magnetic head movement control mechanism that stops the magnetic head moving from the center of the disk outward in the radial direction in front of the lead-out area on the outer periphery of the disk. Since it is configured so that only the optical pickup reaches the lead-out area on the outer peripheral portion of the disk, the magnetic head does not have to interfere with the window of the cartridge and the magnetic head can be made larger accordingly. Therefore, according to the present invention, it is not necessary to make the magnetic head compact and have a precise structure, and the magnetic head can have a simple structure.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a magneto-optical recording / reproducing apparatus according to the present invention.

FIG. 2 is an operation diagram of the magnetic head movement restricting mechanism of the present invention.

FIG. 3 is a principle diagram of a main part of a magneto-optical recording / reproducing device.

FIG. 4 is an exploded perspective view of a magneto-optical disk.

FIG. 5 is a plan view of a conventional magneto-optical disk cartridge.

FIG. 6 is a bottom view of a conventional magneto-optical disk cartridge.

[Explanation of symbols]

1 ... Chassis, 3 ... Rail, 4 ... Optical pickup arm,
5 ... Magnetic head arm, 6 ... Optical pickup, 7 ... Disk, 8 ... Lead-out area, 9 ... Magnetic head, 13
... Spring, 20 ... Magnetic head movement restriction mechanism, 21 ... Overhang portion, 22 ... Stopper block.

Claims (1)

[Scope of utility model registration request] 1. A magneto-optical recording / reproducing apparatus of a type in which a magnetic head is exposed above a disk housed in a cartridge and an optical pickup is exposed below the disk. A magneto-optical recording / reproducing apparatus comprising a magnetic head movement restricting mechanism for stopping the magnetic head moving outwardly in front of a lead-out area on the outer peripheral portion of the disk.