JP3565329B2 - Magnetic head support mechanism and magneto-optical recording / reproducing device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnetic head support mechanism and a magneto-optical recording / reproducing apparatus having a magnetic head and recording / reproducing an information signal on a recordable / reproducible magneto-optical disk. The present invention relates to a magnetic head support mechanism that improves positioning accuracy and workability during assembly.
[0002]
[Prior art]
In recent years, a magneto-optical disk (hereinafter, referred to as a disk) has been used as a recording medium. One of the methods for recording information on the disk is to irradiate the disk with laser light from an optical pickup. In addition, there is a magnetic field modulation method that raises the temperature of a disk and records information by changing the direction of magnetic poles on the disk by a magnetic head positioned opposite to the optical pickup with respect to the disk. In this magnetic field modulation method, since overwriting is possible, the data writing time can be shortened, and this is the main recording method of the magneto-optical disk. For example, the magnetic field modulation method is used in a disk of a standard called MD (Mini Disk). I have.
[0003]
Conventionally, the configuration of a magneto-optical recording / reproducing apparatus using a magnetic field modulation method is as follows.
[0004]
FIG. 7 is a cross-sectional view of a conventional magneto-optical recording / reproducing apparatus, and FIG. 8 is a cross-sectional view of a main part thereof.
[0005]
A suspension 75 to which a magnetic head 72 is attached at the tip is fixed to the head arm 74. The head arm 74 is provided with a hook 74a at its tip. As shown in FIG. 9, when the head arm 74 rotates, the hook 74a hooks the hook 72a of the magnetic head 72 to lift the magnetic head 72. It is configured as follows.
[0006]
The angle 73 is provided with a contact portion 73a. When the head arm 74 rotates in the falling direction, the lower surface of the head arm 74 contacts the contact portion 73a of the angle 73, and at that position, the rotation of the head arm 74 by the torsion spring 76 wound around the angle 73 is performed. Stop. The contact portion 73a positions the magnetic head 72 in the height direction when the magnetic head 72 slides on the disk 71. When the rotation of the head arm 74 is stopped and the magnetic head 72 is in sliding contact with the disk 71, the hook 74a has a gap with the hook 72a. The lower surface of the head arm 74 contacts the contact portion 73a even in the state of the magnetic head support mechanism alone including the angle 73, the head arm 74, the torsion spring 76, the suspension 75, and the magnetic head 72. The contact portion 73a opens the head arm 74 and the angle 73, thereby facilitating the work of assembling the magnetic head support mechanism to the magneto-optical recording / reproducing apparatus.
[0007]
[Problems to be solved by the invention]
However, this configuration has the following problem.
[0008]
When the magnetic head 72 is in sliding contact with the disk 71, the position of the magnetic head 72 in the height direction and the gap between the hook 74a and the hook 72a need to be managed with high accuracy. Since the position of the contact portion 73a for positioning the 72 is close to the rotation fulcrum of the head arm 74, high-precision positioning cannot be performed at the hook 74a at the tip of the head arm 74. For example, the distance from the rotation fulcrum position of the head arm 74 to the position of the contact portion 73a is 1 to the distance from the rotation fulcrum position of the head arm 74 to the position of the gap between the hook portion 74a and the hook portion 72a. In the case of / 5, the height accuracy defect of the contact portion 73a becomes five times the positioning accuracy defect at the position of the gap between the hook portion 74a and the hook portion 72a.
[0009]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a magnetic head supporting mechanism capable of assembling a magneto-optical recording / reproducing apparatus with good workability while maintaining good positioning accuracy of a magnetic head. An object of the present invention is to provide a magnetic recording / reproducing apparatus.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the magnetic head support mechanism of the present invention is configured such that a magnetic head that applies a magnetic field for recording and erasing to a recording surface of a magneto-optical disk stored in a cartridge can be detachably attached to a magnetic field application position. A magnetic head support member having a magnetic head support member rotatably supported by a support base between a retracted position and a biasing means for biasing the magnetic head support member toward the disk. A first contact portion in which the magnetic head support member contacts the holder accommodating the cartridge in a state where the magnetic head is supported at the magnetic field application position, and a second contact portion that contacts the support base and regulates rotation of the magnetic head support member. And a contact portion.
[0011]
According to the above configuration, the magnetic head support member has the first contact portion that contacts the holder that stores the cartridge in a state where the magnetic head support member supports the magnetic head at the magnetic field application position. Positioning in the height direction can be made highly accurate. In addition, since the magnetic head support mechanism has a second contact portion that comes into contact with the support base and regulates the rotation of the magnetic head support member, when the magnetic head support mechanism is assembled to the magneto-optical recording / reproducing apparatus, the support base and the magnetic head are used. It is not necessary to perform the assembling work while opening the space between the support member and the support member.
[0012]
It is preferable that the magnetic head supporting mechanism according to the invention described above is provided such that the second contact portion does not contact the support base when the first contact portion is in contact with the holder.
[0013]
According to the above configuration, in a state where the first contact portion is in contact with the holder, the second contact portion is provided so as not to contact the support base. The positioning of the magnetic head in the height direction by the one contact portion is not hindered.
[0014]
The magneto-optical recording / reproducing apparatus of the present invention includes the above-described magnetic head supporting mechanism, a magnetic head supported by the magnetic head supporting mechanism to apply a magnetic field to the magneto-optical disk, an optical pickup device for irradiating the magneto-optical disk with laser light, A disk rotating mechanism for rotating the magneto-optical disk.
[0015]
According to the above configuration, since the magnetic head support member has the first contact portion that contacts the holder that stores the cartridge, the positioning of the magnetic head in the height direction can be performed with high precision. In addition, since the magnetic head support mechanism has a second contact portion that comes into contact with the support base and regulates the rotation of the magnetic head support member, when the magnetic head support mechanism is assembled to the magneto-optical recording / reproducing apparatus, the support base and the magnetic head are used. It is not necessary to perform the assembling work while opening the space between the support member and the support member. Further, when the first contact portion is in contact with the holder, the second contact portion is provided so as not to contact the support base. Therefore, the second contact portion is formed by the first contact portion. It does not hinder the positioning of the magnetic head in the height direction.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0017]
FIG. 3 is a schematic configuration diagram of a main part of the magneto-optical recording / reproducing apparatus. The disk 10 housed in the cartridge 12 having the openings 12a and 12b is chucked on a turntable (not shown) provided in the spindle motor 2, and the optical pickup device 14 is placed at a predetermined distance on one surface of the disk 10. The magnetic head 3 is disposed at a position facing the optical pickup device 14 on the other surface of the disk 10, and the optical pickup device 14 and the magnetic head 3 are integrally fixed to a coupling mechanism 16. The coupling mechanism 16 includes a housing 5, an angle 6, and a head arm 7, which will be described later. The magnetic head 3 and the optical pickup device 14 are driven integrally by the feed motor 15, and the magnetic head 3 moves in the opening 12 a along the radial direction of the disk 10 in contact with the disk 10, and The device 14 moves inside the opening 12b along the radial direction of the disk 10. At this time, a magnetic field is applied from the magnetic head 3 and a laser beam is emitted from the optical pickup device 14 to record or erase information.
[0018]
FIG. 1 is a sectional view of a magneto-optical recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part thereof.
[0019]
The spindle motor 2 for rotating and driving the turntable 4 is fixed to the chassis 1, and the optical pickup device 14 described above is attached to the spindle motor 2. The optical pickup device 14 is linearly moved in the radial direction of the disk 10 by the above-described feed motor 15 together with the magnetic head 3.
[0020]
The housing 5 is integrally formed at one end of the optical pickup device 14. An angle 6 as a support base that rises on the upper surface side of the chassis 1 is provided upright at the end opposite to the optical pickup device side in the housing 5. At an end of the angle 6 opposite to the housing 5 side, a rotation support portion 6a for supporting rotation of a head arm 7, which will be described later, which is a magnetic head support member, protrudes from the side surface portion 6b, and the rotation support portion 6a , A rotary shaft 17 penetrates.
[0021]
The magnetic head 3 is attached to the tip of the head arm 7, and a suspension 8 made of an elastic member is fixed. The magnetic head 3 is supported to be able to swing vertically with respect to the head arm 7 by the elastic bending of the suspension 8, and follows the surface deflection of the disk 10.
[0022]
Further, a torsion spring 9 as a biasing means for biasing the head arm 7 toward the disk is wound around a rotation support shaft 17 of the angle 6, and one end of the torsion spring 9 penetrates the side surface 6 b of the angle 6 and is held. The other end is held in contact with the end of the head arm 7 on the angle 6 side. The head arm 7 is always elastically biased (biased) in the falling direction, that is, in the direction of the disk 10 by the torsion spring 9. Thus, the magnetic head 3 is supported so as to slide on the disk 10 while facing the objective lens of the optical pickup device 14.
[0023]
A holder 11 is rotatably provided between the chassis 1 and the head arm 7. The holder 11 is formed, for example, by bending a thin plate into a U-shape to form a cartridge accommodating portion, and is provided with an opening 11 a on the upper surface for securing a moving area of the magnetic head 3. Since the opening 11a is disposed on the opening 12a, the magnetic head 3 can slide on the disk 10. The holder 11 has a rotation fulcrum (not shown), and rotates between a disk loading position (magnetic field applying position) at which recording and reproduction can be performed on the disk 10 and a cartridge insertion / removal position (retreat position) at which the cartridge 12 can be inserted / removed. I do.
[0024]
A lifter 13 for rotating the head arm 7 is provided on the upper surface of the holder 11. The lifter 13 is configured to be rotatable around a rotation fulcrum (not shown), and is located on the lower surface of the head arm 7 with a gap from the head arm 7.
[0025]
Further, the tip of the head arm 7 is divided into a portion having a hook 7a at the tip and an extension 7b having a contact portion 7c at the tip. The hook 7 a is configured to hook the hook 3 a of the magnetic head 3 when the head arm 7 rotates, and to lift the magnetic head 3 from the disk 10. In a state where the head arm 7 is in the down state and the magnetic head 3 is in sliding contact with the disk 10, the hooking portion 7a has a gap between itself and the hook portion 3a.
[0026]
The extension portion 7b, which extends the tip of the head arm 7 further from the position of the magnetic head 3, has a contact portion 7c at the tip of the lower surface thereof. When the magnetic head 3 is in sliding contact with the disk 10, the contact portion 7 c is slidably in contact with the holder 11. The shape of the contact portion 7c is hemispherical, and the holder 11 contacts the tangential direction of the contact portion 7c. By making the contact portion 7c hemispherical, the contact state does not change even if the mounting angle between the head arm 7 and the holder 11 is not strictly adjusted, so that the sliding state can be stabilized. Further, in order to improve the slidability of the contact portion 7c with respect to the holder 11, a surface coat may be applied to the contact portion 7c or the holder 11 to improve the slidability.
[0027]
When the contact portion 7c comes into contact with the upper surface of the holder 11 accommodating the cartridge 12, the rotation of the head arm 7 by the torsion spring 9 is stopped at the contact position, and the magnetic head 3 is positioned in the height (vertical) direction. Can also be done. Since the position of the contact portion 7c is close to the position of the magnetic head 3, the height position between the magnetic head 3 and the disk 10 is not easily shifted, and the magnetic head 3 can be accurately positioned.
[0028]
The head arm 7 has an abutment lever 7 d extending substantially perpendicularly from the lower surface at the end of the rotation fulcrum, and the abutment lever 7 d is provided near the angle 6. The contact lever 7d and the rotation support portion 6a are connected by a rotation support shaft 17, and the head arm 7 is rotatably supported on the angle 6 about the rotation support shaft 17. The contact lever 7d has a shape that always has a gap with the angle 6 except for the distal end so that the contact lever 7d contacts the angle 6 at its distal end and does not contact the angle 6 at other portions.
[0029]
As shown in FIG. 4, in a state before the magnetic head supporting mechanism alone including the angle 6, the head arm 7, the torsion spring 9, the suspension 8, and the magnetic head 3 is assembled to the magneto-optical recording / reproducing apparatus, the contact is made. The tip of the lever 7d comes into contact with the angle 6, and the angle between the head arm 7 and the angle 6 is maintained at a sufficiently large angle α. Thereby, a predetermined interval can be secured between the head arm 7 and the bottom surface 6c of the angle 6. Therefore, when assembling the magnetic head support mechanism alone into the magneto-optical recording / reproducing apparatus, it is possible to easily insert the holder 11 between the angle 6 and the head arm 7 and attach the housing 5 to the angle 6. Thus, the workability in assembling the magnetic head support mechanism can be improved.
[0030]
The angle α is slightly smaller than the angle formed by the head arm 7 and the angle 6 when the contact portion 7c is in contact with the upper surface of the holder 11 when the magnetic head supporting mechanism alone is assembled to the magneto-optical recording / reproducing apparatus. Thus, when the contact portion 7c is in contact with the holder 11, the distal end of the contact lever 7d does not contact the angle 6 with a gap, so that positioning by the contact portion 7c is possible.
[0031]
Hereinafter, the operation when the disc 10 is ejected will be described.
[0032]
First, when the lifter 13 rotates in the direction A, the lifter 13 raises and rotates the head arm 7. Accompanying this, the hook 7a of the head arm 7 hooks the hook 3a of the magnetic head 3, so that the magnetic head 3 rotates and moves to a position away from the disk 10.
[0033]
Subsequently, the holder 11 rotates about a pivot (not shown), and the cartridge 12 containing the disk 10 is ejected. At this time, the magnetic head 3 is at a position spaced from the holder 11 and has been retracted to a position where it does not hinder the ejection of the cartridge 12. Further, the operation of inserting the disk 10 is achieved in a procedure reverse to the above-described ejection operation.
[0034]
Here, a magneto-optical recording / reproducing apparatus as a comparative example not having the contact lever 7d will be described.
[0035]
As shown in FIG. 5, the head arm 7 in the comparative example has a rotation support portion 7e supported by the rotation support shaft 17 instead of the contact lever 7d. The rotation support portion 7e has a function of supporting the rotation of the head arm 7. Even in such a configuration, since the head arm 7 has the contact portion 7c, it is possible to position the magnetic head 3 in the height direction similarly to the above-described configuration.
[0036]
However, as shown in FIG. 6, before being incorporated in the magneto-optical recording / reproducing apparatus, in the state of the magnetic head supporting mechanism alone including the angle 6, the head arm 7, the torsion spring 9, the suspension 8, and the magnetic head 3, Due to the urging force of the torsion spring 9, the angle β between the angle 6 and the head arm 7 is very small. Therefore, when assembling the magnetic head support mechanism alone into the magneto-optical recording / reproducing apparatus, it is necessary to perform the assembling work while opening the space between the angle 6 and the head arm 7, resulting in deterioration of workability.
[0037]
As described above, if only the contact portion 7c is provided to accurately position the magnetic head 3 in the height direction, the magnetic head 3 can be positioned with high accuracy. Since it is not provided, workability in assembling the magnetic head support mechanism is inferior to that of the above-described configuration.
[0038]
On the other hand, the magnetic head support mechanism in the magneto-optical recording / reproducing apparatus according to the present embodiment has the contact portion 7c so that the magnetic head 3 can be positioned with high accuracy in the height direction and the contact lever 7d. Is provided to ensure workability when the magnetic head support mechanism is incorporated.
[0039]
As described above, the magneto-optical recording / reproducing apparatus of the present invention can accurately position the magnetic head 3 when the magnetic head 3 comes into contact with the disk 10 by bringing the contact portion 7c into contact with the upper surface of the holder 11. Further, since the contact lever 7d is provided, it is not necessary to perform an assembling operation while opening the angle 6 and the head arm 7 when assembling the magnetic head support mechanism alone into the magneto-optical recording / reproducing apparatus. Thereby, workability at the time of assembling the magnetic head support mechanism can be secured. Moreover, the contact lever 7d does not contact the angle 6 when the contact portion 7c is in contact with the holder 11, so that the positioning by the contact portion 7c is not hindered. Further, since the contact lever 7d also has a function of supporting the rotation of the head arm 7 about the rotation support shaft 17, the structure of the magnetic head support mechanism can be prevented from becoming complicated.
[0040]
【The invention's effect】
As described above, the magnetic head support mechanism of the present invention includes a first contact portion in which the magnetic head support member contacts the holder that houses the cartridge while the magnetic head support member supports the magnetic head at the magnetic field application position; A second contact portion that contacts the support base and regulates rotation of the magnetic head support member.
[0041]
Thereby, the positioning of the magnetic head can be performed with high precision, and when the magnetic head support mechanism having the magnetic head, the magnetic head support member, and the support base is assembled to the magneto-optical recording and reproducing apparatus, It is not necessary to perform the process while opening the gap between the support base. Therefore, the magnetic head can be accurately positioned, and the workability when assembling the magnetic head support mechanism alone into the magneto-optical recording / reproducing apparatus can be ensured.
[0042]
The above-described magnetic head support mechanism is configured such that the second contact portion is provided so as not to contact the support base when the first contact portion is in contact with the holder.
[0043]
Thus, the second contact portion does not hinder the positioning of the magnetic head in the height direction by the first contact portion. Therefore, it is possible to improve the positioning accuracy of the magnetic head while ensuring good workability of assembling the magnetic head support mechanism to the magneto-optical recording / reproducing apparatus.
[0044]
The magneto-optical recording / reproducing apparatus of the present invention includes the above-described magnetic head supporting mechanism, a magnetic head supported by the magnetic head supporting mechanism to apply a magnetic field to the magneto-optical disk, an optical pickup device for irradiating the magneto-optical disk with laser light, And a disk rotating mechanism for rotating the magneto-optical disk.
[0045]
Thereby, the positioning of the magnetic head in the height direction can be performed with high accuracy. Further, when assembling the magnetic head support mechanism to the magneto-optical recording / reproducing apparatus, the assembling work does not have to be performed while opening the space between the support base and the magnetic head support member. Further, the second contact portion does not hinder the positioning of the magnetic head in the height direction by the first contact portion. Therefore, it is possible to provide a magneto-optical recording / reproducing apparatus in which the positioning accuracy of the magnetic head is excellent while ensuring good workability of assembling the magnetic head support mechanism to the magneto-optical recording / reproducing apparatus.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a magneto-optical recording and reproducing apparatus according to an embodiment of the present invention at the time of head sliding contact.
FIG. 2 is a sectional view of a main part of the magneto-optical recording / reproducing apparatus.
FIG. 3 is a schematic configuration diagram of a main part of the magneto-optical recording / reproducing apparatus.
FIG. 4 is a sectional view of a single magnetic head support mechanism in the magneto-optical recording / reproducing apparatus.
FIG. 5 is a cross-sectional view of a magnetic recording / reproducing apparatus in a comparative example when the magnetic head slides.
FIG. 6 is a sectional view of a magnetic head supporting mechanism alone in a comparative example.
FIG. 7 is a cross-sectional view of a conventional magneto-optical recording / reproducing apparatus at the time of magnetic head sliding contact.
FIG. 8 is a sectional view of a main part of a conventional magneto-optical recording / reproducing apparatus.
FIG. 9 is a sectional view of a conventional magneto-optical recording / reproducing apparatus when a magnetic head is separated.
[Explanation of symbols]
1 chassis 2 spindle motor (disk rotation mechanism)
3 magnetic head 3a hook 4 turntable (disk rotating mechanism)
6 angles (support base)
7 Head arm (magnetic head support member)
7a Hooking part 7b Extension part 7c Contact part (first contact part)
7d contact lever (second contact part)
9 Torsion spring (biasing means)
Reference Signs 10 Disc 11 Holder 11a Opening 12 Cartridge 12a Opening 13 Lifter 17 Rotation support shaft

Claims (3)

A magnetic head for rotatably supporting a magnetic head for applying a magnetic field for recording and erasing to a recording surface of a magneto-optical disk housed in a cartridge between a magnetic field applying position and a retracting position for allowing the cartridge to be detachably mounted, on a support base. In a magnetic head support mechanism comprising a head support member and an urging means for urging the magnetic head support member toward the disk,
A first contact portion in which the magnetic head support member contacts a holder accommodating the cartridge in a state where the magnetic head support member supports the magnetic head in a magnetic field application position; and a magnetic head support in contact with the support base. A magnetic head support mechanism comprising: a second contact portion for restricting rotation of a member. 2. The magnetic head support according to claim 1, wherein the second contact portion is provided so as not to contact the support base when the first contact portion is in contact with the holder. 3. mechanism. A magnetic head support mechanism according to claim 1 or 2,
A magnetic head supported by the magnetic head support mechanism to apply a magnetic field to the magneto-optical disk;
An optical pickup device for irradiating the magneto-optical disk with laser light,
A magneto-optical recording / reproducing apparatus comprising: a disk rotating mechanism for rotating the magneto-optical disk.

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