JPH05128617A - Magnetic head holding mechanism - Google Patents

Abstract

PURPOSE:To reduce a space loss by movement of an objective lens and a magnetic head to minimum at the time of loading/unloading the disk in a magnetic modulation type magneto-optical recording and reproducing device having the objective lens of an optical system and a vertical type magnetic head arranged to oppose each other through a magneto-optical disk. CONSTITUTION:On a sub guide 17 arranged integrally to an optical member 15 rating a required laser beam to the magneto-optical disk 8, a magnetic head moving base 24 guided by the sub guide base 17 and slidable in the direction of the radius of the disk is placed, and by moving and driving the magnetic head moving base 24 by a rotating arm 47 at the time of loading/unloading the disk, load/unload is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic modulation type magneto-optical recording / reproducing apparatus, and more particularly to a magnetic head holding mechanism arranged at a position facing an objective lens of an optical system through a magneto-optical disk.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing the essential parts of a conventional magnetic modulation type magneto-optical recording / reproducing apparatus. In the figure, 1 is the base of the device,
Motor holders 2 and 3 for holding a spindle motor 4 are formed on the base. A disk mounting table 6 is integrally attached to the rotary shaft 5 of the spindle motor 4, and a cylindrical concave groove is formed on the upper surface of the disk mounting table 6 around the rotary shaft, and the required concave portion is formed. A magnet 7 is arranged at the location. On the other hand, the magneto-optical disk 8 has a disk-shaped metal fitting 9 integrally fixed to the recording medium section 11 by a flange section 10 at the center thereof. This disk-shaped metal fitting 9
Has a central hole formed in its center for engaging with the head of the rotary shaft 5, and as shown in FIG.
It has an external shape that can be loosely inserted into the concave groove. Therefore, when the magneto-optical disk 8 is mounted on the disk mounting table 6, the disk-shaped metal fitting 9 is attracted and fixed to the magnet 7 and can rotate integrally with the rotary shaft 5.

An optical system member 15 is provided between the guide rail holding bases 13 formed on the base 1 like the motor holding bases 3.
A pair of guide rails 14 is installed to be slidable in parallel with the surface of the magneto-optical disk 8 and in the radial direction of the disk.

The optical system member 15 includes an objective lens 16, focusing means (not shown), driving means for tracking, and the like, and the parallel movement is controlled by the tracking control means (not shown). A magnetic head support member 56 is fixed to the outer casing of the optical system member 15 so as to extend in the radial direction. A leaf spring 58 is attached to the L-shaped tip portion 57 of the magnetic head support member 56 so as to extend in the central direction. A slider-44 having a concave groove 59 for air circulation extending in the tangential direction is attached to the tip of the leaf spring 58 on the side facing the magneto-optical disk 8. A perpendicular magnetic head 55 for generating a magnetic field on the disk in accordance with a recording signal is arranged at a predetermined position on the outer peripheral projection of the slider 44. At this time, the vertical magnetic head 55 and the objective lens 16 are opposed to each other via the magneto-optical disk 8, and the central axis of the core of the vertical magnetic head 55 and the predetermined optical axis of the optical system member 15 are aligned with each other. There is. The axis L1 in the figure shows this common axis.

Therefore, since recording on the magneto-optical disk 8 is performed near the intersection of the axis L1 and the magneto-optical disk 8, the moving range of the axis L1 is at least the innermost circumference of the recording area of the magneto-optical disk 8. Care must be taken to cover the position P2 to the outermost position P1 of the recording area.

On the other hand, when the magneto-optical disk 8 is attached to or detached from the mounting table 6, the axis L1 is allowed to move in the direction of arrow B beyond the position P1, and the tip of the leaf spring 58 interferes with the attachment / detachment of the disk. You have to be Further, when the magneto-optical disk 8 is housed in the protective case, FIG. 6 shows only the end 12 of this protective case. In this case, the tip of the leaf spring 58 is not limited to the disk. In order to move further out of the end 12 of the protective case, at least the axis L1 must be brought to the standby position P3. Further, during this movement, the leaf spring 5
In order to avoid the collision between the slider 44 attached to the tip of the slider 8 and the end 12 of the protective case 12, it is necessary to devise to lift the slider 44 upward by an appropriate lifting means.

[0007]

As described above, as an example of performing signal recording using the magneto-optical disk, the objective lens and the magnetic head are arranged at the positions facing each other through the disk as in the conventional example. A configuration in which they are moved integrally is conceivable. In this case, considering the attachment / detachment of the disk, the axes L1 of the movable members such as the optical system member 15, the magnetic head support member 56, the leaf spring 58, and the slider 44, which are integrally formed, have the innermost circumferential position P1. To the standby position P3 shown by the dotted line in the figure, it must be constructed so that it can slide on the guide rail. For this purpose, the position of the guide rail holding base 13 is extended with the extension of the guide rail. Must be moved to the position indicated by the dotted line 13 'in the figure.

As described above, in the above-mentioned conventional example, a considerable moving space is required for moving the moving member for attaching and detaching the disk.
Must be secured, which is one of the factors that hinders the downsizing of the device.

[0009]

An objective lens for irradiating convergent light is provided on one surface of a magneto-optical disk which is mounted on a rotating means arranged on a base and rotates integrally with its rotating shaft. Optical means held on the base body so as to be movable in the radial direction of the magneto-optical disk, and guide means having a guide that moves integrally with the optical means and extends in the radial direction of the magneto-optical disk. A magnetic head holding means that holds a magnetic head on the other surface side of the magneto-optical disk, is guided by the guide and is slidably supported by the guide means, and the magnetic head via the magneto-optical disk. And a regulating means for maintaining the magnetic head holding means at a first position facing the objective lens, and the magnetic head holding means is driven to move between the first position and a second position in the radial direction. And a drive means.

[0010]

The optical means is driven so that the converged light can be emitted from the innermost position to the outermost position of the recording area of the magneto-optical disk while the magnetic head holding means is maintained at the first position. Further, the magnetic head holding means is moved from the first position to the second position while the optical means is maintained at the position where the converged light is the outermost peripheral position of the magneto-optical disk. Desorption can be facilitated.

[0011]

1 and 2 are front perspective views of an essential part of an embodiment of the present invention, showing different states, with reference to FIGS. 3 and 4 which are perspective views of the essential part of the present invention. The configuration and operation will be described.

In order to avoid duplication of the description of the conventional example shown in FIG. 6, common parts are given the same reference numerals and the description thereof is omitted.

In the figure, reference numeral 17 denotes a sub guide base, which is attached to the outer casing of the optical system member 15 so that the guide direction thereof extends in the radial direction with respect to the rotary shaft 5. This sub guide stand 1
A substantially U-shaped guide groove is formed on the upper surface of 7 by a pair of regulating side portions 18, 18 for guiding the mounted magnetic head moving base 24 in the radial direction and a flat portion 19 for mounting. A long hole 20 extending in the radial direction is formed at the center of the flat surface portion 19. Further, as is clear from each figure, the center-direction end portion 21 of the upper guide groove has an inclined guide portion that is inclined so that the depth thereof gradually increases. Stopper plates 22 and 22 are formed on the upper portions of the restriction side portions 18 and 18 at substantially the center thereof and project outward. Further, the pair of stopper plates hold spring holding plates 23 which extend in the direction of the disk center in a substantially U-shape at the upper part thereof.

The magnetic head moving table 24 is the sub guide table 1
7, a base portion 25 that fits into the substantially U-shaped upper guide groove and extends in the disk radial direction, and a protrusion portion 26 that is continuously formed in an L-shape at the end of the base portion 25 in the center direction. The spring holding portion 28 is formed continuously with the radial end of the base portion 25 and has a predetermined flat portion 27 at a height h from the bottom surface of the base portion.

Accordingly, as shown in FIG. 1, when the protrusion 26 of the magnetic head moving base 24 is located at the deepest part of the guide groove of the end 21 of the sub guide base 17 in the center direction, the magnetic field and the flat surface 19 of the sub guide base 17 are The base portion 25 of the head moving table 24 and the base portion 25 are parallel to each other, but when the protrusion 26 reaches the flat surface portion 19, the base portion 25 and the flat surface portion 19 are inclined as shown in FIG. The entire movable table 24 tilts.

Further, the spring holding portion 28 has a pair of regulating plates 29, 29 formed on both sides thereof so as to be capable of contacting the pair of stopper plates 22, 22, and the upper end portion of the regulating plate 29, 29 is pressed from the upper surface thereof. -Post 30 that rotatably supports the lever 31
And a leaf spring 32 that extends toward the center of the disk is held on the upper surface.

The sub-guide base 17 and the magnetic head moving base 24 are connected at two places via springs. One of the couplings is made by a regulating pin 33 and a leaf spring 35, and the regulating pin 33 is located below the spring holding portion 28 of the magnetic head moving base 24 and extends from the elongated hole 20 of the sub guide base 17.
The leaf spring 3 shown in FIG. 5 is installed between the brim 34 at the tip and the lower surface 38 of the sub guide stand 17 at a position penetrating the
5 is arranged in a compressed state. The lower surface 38 and the regulation side portions 37, 37 form a lower guide groove extending in the radial direction of the disk, similar to the substantially U-shaped upper guide groove formed on the upper surface. The lower contact grooves 36, 36 of the leaf spring 35 are fitted and guided in the lower guide groove, and the magnetic head moving base 24 placed on the upper surface and the leaf spring 35 are integrally and smoothly slid. Is possible. As is clear from the above configuration, the leaf spring 35 is regulated to stand from the lower surface of the magnetic head moving base 24 so as to press-contact the sub guide base 17 and the magnetic head moving base 24 placed on the sub guide base 17. It acts on the pin 33.

The other connection is a spring holding plate 2
3 and a coil spring 40 hung in a stretched state between the engaging portion 39 of the spring holding plate and the central portion of the support column 30 standing upright from the magnetic head moving table 24. The opposing surfaces of the formed stopper plates 22 and 22 and the regulation plates 29 and 29 formed on the magnetic head moving base 24 are urged in a direction of pressure contact.

Further, in the approximate center of the regulating plates 29, 29, an adjusting screw 41 having a conical tip portion protruding from its facing surface,
41 is held in a screwed state, while the stopper plate 2
Adjusting screws 41, 41 are provided on the parts of
Engaging holes 42, 42 into which the conical tip end of can be inserted and removed are formed.

Therefore, as shown in FIG. 3, the regulating plates 29, 29
When the stopper plates 22 and 22 are pressed against each other, they are firmly positioned with respect to each other.

A gimbal portion 43 is formed at the tip of the leaf spring 32, and a mounting hole 46 for fixing the slider 44 with a set screw 45 is formed in the center portion of which the surface can freely swing.

On the other hand, on the base 1, a rotating arm 47 is rotated parallel to the disk surface at a position where it comes into contact with the vicinity of the bottom of the V-shaped groove of the pulley 31 arranged on the magnetic head moving base 24. A rotating shaft 48 is erected for rotatably supporting the movable shaft 48 so as to move.

As is apparent from FIGS. 3 and 4, the rotary arm 47 abuts against the pulley 31 at the tip end thereof, and the elongated hole 49 is formed from the vicinity of the center of rotation to the central portion. There is.
Further, between the base 1 and the rotating arm, rotatably held by a support column 50 that is planted on the base 1, and the tooth gear 5 is attached to the peripheral surface.
A rotary disk 51 having two parts is arranged, and an engaging pin 53 penetrating through the long hole 49 of the rotary arm is planted on the rotary disk 51.

Therefore, when the rotary disk 51 is rotationally driven to a desired position by the rotary drive means (not shown) that meshes with the meshing gear 52 and drives it to rotate, the rotary arm 47 rotates, The magnetic head moving base 24 can be brought to a desired position against the eccentric force of the coil spring 40.

The operation of the above configuration will be described. 1 and 3, L1 indicating the common axis of the central axis of the perpendicular magnetic head 55 and the predetermined optical axis of the optical system member 15 is
The state where the magnetic disk 8 is brought to the outermost peripheral position P1 of the recording area is shown.

At this time, the optical system member 15 is located on the outermost side of the moving area, and the regulating plates 29, 29 and the stopper plate 22,
22 and 22 are in pressure contact with each other and are firmly positioned with respect to each other. Therefore, the optical system member 15 is
The optical system member 15 and the magnetic head moving base 24 move integrally when moving within the movement area limited by the data holding base 3 and the guide rail holding base 13, so that the objective lens 16 and the vertical magnetic head 55 are moved. Correspondence does not change either.

When the optical system member 15 is brought to the innermost side regulated by the motor holding table 3, the common axis L1 coincides with the innermost peripheral position P2 of the recording area of the magneto-optical disk 8. And while the optical system member 15 moves within its moving region, the rotation arm 47 is at a position further rotated clockwise from the position shown in FIG. It is assumed that the drive is controlled so as not to prevent the integrated movement of the magnetic head moving base 24 and the magnetic head moving base 24.

On the other hand, when removing the magneto-optical disk 8,
The optical system member 15 is moved to the outermost side shown in FIGS. After that, the rotary disk 51 shown in FIG. 3 is rotationally driven in the counterclockwise direction, and the rotary arm 47 is also rotated in the counterclockwise direction. By the rotation of the rotation arm 47 at this time, the magnetic head moving base 24 moves in the radial direction on the sub guide base 17, and after passing through the intermediate position shown in FIGS. Will be brought up. This standby position is the gimbal portion at the tip of the leaf spring 32 when the magneto-optical disc itself or the case where the disc is housed in the protective case as described in FIG. 6 is detached. 43 is set in consideration so as not to get in the way. 1 and 2 show the end 12 of the protective case, the magnetic head moving base 24 has a protrusion 26 on the end in the center direction of the sub guide base 17 as the magnetic head moving base 24 moves in the radial direction. As shown in FIGS. 2 and 4, the entire portion tilts from the deepest portion of the guide groove of the portion 21 to the plane portion 19, so that the slider 44 attached to the leaf spring 32 contacts the end portion 12 of the protective case. You can move without.

The invention of the present application is not limited to the above-mentioned embodiments, but various modes are conceivable.

[0030]

As described above, according to the present invention, the limit of the radial direction of the moving range of the optical means is set to the position where the irradiation position of the convergent light applied to the magneto-optical disk is the outermost position of the recording area. it can.

Therefore, it is not necessary to extend the moving range of the optical means in the radial direction more than necessary for attaching and detaching the magneto-optical disk as in the conventional case, and the arrangement space of the means for holding the optical means slidably. -Since the space and the moving space of the optical means itself can be minimized, it is possible to contribute to downsizing of the device.

[Brief description of drawings]

FIG. 1 is a front perspective view of a main part showing a state of an embodiment of the present application.

FIG. 2 is a front perspective view of a main part showing another state of the embodiment of the present application.

FIG. 3 is a perspective view of a main part shown corresponding to FIG.

FIG. 4 is a perspective view of an essential part shown corresponding to FIG.

5 is a perspective view showing a natural state of the leaf spring 35. FIG.

FIG. 6 is a front view of a main part showing a conventional configuration.

[Explanation of symbols]

 1 Base 2 Motor Holding 3 Motor Holding 4 Spindle Motor 5 Rotation Axis 6 Disc Mounting 8 Magneto-optical Disc 13 Guide Rail Holding 14 Guide Rail 15 Optical System Member 17 Sub Guide 24 Magnetic head moving base 31 Pulley 32 Leaf spring 35 Leaf spring 40 Coil spring 44 Slider 47 Rotating arm 51 Rotating disk 55 Vertical magnetic head

Claims (1)

[Claims] 1. An objective lens for irradiating convergent light is provided on one surface side of a magneto-optical disk which is mounted on a rotating means arranged on a base and rotates integrally with its rotating shaft. Optical means held by a base body so as to be movable in the radial direction of the magneto-optical disk; guide means having guides that move integrally with the optical means and extend in the radial direction of the magneto-optical disk; A magnetic head holding means for holding a magnetic head on the other surface side of the disk and supported by the guide means so as to be slidably guided by the guide; and the objective lens through the magneto-optical disk. Regulating means for maintaining the magnetic head holding means at a first position facing the magnetic head holding means, and driving means for moving the magnetic head holding means between the first position and a second radial position. Magnetic head holding mechanism, characterized in that it has.