JPH0453049A - Magnetic field modulation head feeding mechanism for magneto-optical disk device - Google Patents

Abstract

PURPOSE:To automate loading and unloading by providing an element part including a magnetic field modulation head on a fitting base, and moving the modulation head to the prescribed position of a magneto-optical head with the falling-down of a cartridge holder when inserting the disk. CONSTITUTION:When a cartridge holder 16 falls down at the height of an arrow B in order to move a magneto-optical disk 19 to the prescribed position, an arm base 10 falls down together with the falling-down of a support shaft 23 and according to the relative relation with an abutting part 15, the arm base is turned in a counter-clockwise direction with the support shaft 23 as a center. Then, a fitting base 8 supported by a link shaft 22 falls down, and a magnetic field modulation head 1 is positioned at the prescribed height to the magneto-optical head. The head 1 is moved along a feeding shaft 5 by a linear motor for feeding drive and executes recording or reproducing to a disk 19 together with the optical head on the downside of the disk 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic field modulation head feeding mechanism for a magnetic field modulation type magneto-optical disk device.

[Prior Art] A magnetic field modulation type magneto-optical disk device generally has a configuration in which an optical head is placed on one side of a magneto-optical disk and a magnetic field modulation head is placed on the other side. The optical head and the magnetic field modulation head must always be driven in the disk radial direction while facing each other.

By the way, commercialization of optical disk devices such as CD players has progressed to a high degree, and optical disks are stored in cartridge cases to form cartridges, and this disk cartridge is placed in the cartridge holder of the optical disk device to automatically load and unload. Loading has been made possible. However, in magnetic field modulation type magneto-optical disk devices, there is not only an optical head but also a magnetic field modulation head that must be constantly opposed to the optical head and driven, so the situation is different from the case of the above-mentioned optical disk device. It is not easy to make a magneto-optical disk into a cartridge and create a mechanism that can automatically load and unload it. Therefore, in conventional magneto-optical disk devices, it is difficult to automatically load and unload a magneto-optical disk in a cartridge. An unloading mechanism has not yet been developed.

[Problems to be Solved by the Invention] As mentioned above, there is a difficult situation in that there is a magnetic field modulation head facing the optical head, but even in a magneto-optical disk device using a magnetic field modulation method, when considering operability, It is desirable to be able to automatically load and unload a magneto-optical disk in the form of a cartridge.

The present invention was made against the above background, and aims to provide a magnetic field modulation head feeding mechanism for a magneto-optical disk device that enables automatic loading and unloading of a magneto-optical disk in the form of a cartridge. purpose.

[Means for Solving the Problems] The invention according to claim 1 which solves the above problems is provided with a feed shaft that supports the magnetic field modulation head so as to be movable in the disk radial direction, and a link mechanism is provided in the cartridge holder that holds the disk cartridge. a feeding drive linear motor provided on the mounting base to feed and drive the magnetic field modulation head in the disk radial direction; and a feeding drive linear motor provided on the mounting base to drive the magnetic field modulation head in the disk radial direction. a position detection sensor that detects the position of the mounting base, and the link mechanism is configured to lower the magnetic field modulation head to a predetermined height position close to the magneto-optical disk as the cartridge holder moves downward. This is a magnetic field modulation head feeding mechanism for a magneto-optical disk device, characterized in that it is configured to lower the magnetic field modulation head.

A second aspect of the invention provides an arm base that is rotatable in the vertical direction via a support shaft and is biased in the rotational direction by a torsion spring to be removed from a cartridge holder that holds a disk cartridge; a mounting base attached to the arm base at a position facing an opening provided in the holder so as to be rotatable in the vertical direction via a connecting shaft on the opposite side to the supporting shaft and biased in the rotational direction by a torsion spring; A feed shaft that supports a magnetic field modulation head movably in the disk radial direction, which is fixed at both ends to a mounting base, and a linear motor magnet whose both ends are fixed to the mounting base, and which moves the magnetic field modulation head along the feed shaft. a linear motor for feeding the arm base; a position detection sensor provided on the mounting base to detect the position of the magnetic field modulation head in the disk radial direction; and one end of the arm base at the retracted position of the cartridge holder. a first engaging means for engaging a portion of the mounting base with the cartridge holder so as to receive the rotational reaction force of the torsion spring; a second engagement 11 stage that engages with the car I/ridge holder so as to receive () the cartridge holder; When lowering, the arm base abutting portion contacts an immovable part such as the chassis base, and when lowering the cartridge holder, both ends of the mounting base in the disk radial direction contact the cartridge holder, and the mounting base is placed at a predetermined height position. This is a magnetic field modulation head feeding mechanism for a magneto-optical disk device, characterized in that it is equipped with a positioning means for positioning the head.

[Function] In the magnetic field modulation head feeding mechanism according to claim 1, the link mechanism holds the entire magnetic field modulation head, the feeding drive linear motor, and the position detection sensor in the cartridge holder, and moves the magnetic field modulation head at the retracted position of the cartridge holder. The disk car 1 is positioned at a position away from the ridge, and when the cartridge holder is lowered, the magnetic field' moves the adjustment head to a predetermined height position with respect to the magneto-optical disk.

In the magnetic field modulation head feeding mechanism according to claim 2, in the retracted position of the cartridge holder, the arm base is biased in the rotational direction by a torsion spring, and the rotational reaction force of the torsion spring is received by the first engagement means; Also,
The mounting base rotatably connected to the tip of the arm base via a connecting shaft is subjected to a force in the rotational direction by a torsion spring, and the rotational reaction force of the torsion spring is received by the second engagement means, In this way, the arm base and the mounting base are held in a predetermined initial position.

When the cartridge holder is lowered to move the magneto-optical disk to a predetermined operating position, the support shaft lowers together with the cartridge holder, and the arm base tends to lower. However, since the arm base abutment part that is integrated with the arm base abuts against a stationary part such as the chassis base,
The arm base rotates around the support shaft while being relatively pushed up by the arm base abutment, the connecting shaft at the tip of the arm base descends, the mounting base supported by this connecting shaft lowers, and the installation is completed. The base is positioned at a predetermined height position by the positioning means. In this way, the magnetic field modulation head supported by the mounting base via the feed shaft is positioned at a predetermined height position close to the magneto-optical disk.

Further, when taking out the magneto-optical disk, the magnetic field modulation head returns to the initial position by an operation that is almost the reverse of the above-described operation.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5.

In FIG. 2, reference numeral 20 denotes a disk cartridge containing the magneto-optical disk 19. As shown in FIG. The disk cartridge 2o is mounted in a cartridge holder 16 as shown in FIG.
is maintained. This curly 1:5'po/
The Lder 16 is movable in the direction of the magneto-optical disk (to the right in FIGS. 1 and 2), and moves the magneto-optical disk to a predetermined operating position inside the device. It is possible to go up and down.

As shown in the first [7I], the cartridge holder 1
Fix the arm base f; f base] 2 on G'J1
, this arm base mounting base] 2 is attached via the support shaft 23 to a roughly square-shaped a-no when viewed from the top, base] 0 is on top,
It is attached so that it can rotate downward and is biased in the rotational direction by torsion coil byes 13 attached to both ends of the support shaft 23. This torsion coil spring 13 pushes the arm base 10 clockwise by one force in FIG.

In addition, this arm base] 0 has a positioning abutment part 14 that comes into contact with the -F surface of the cartridge holder 16 when the cartridge holder 16 is in the retracted position, and a positioning part 14 that contacts the chassis base] 8 when the cartridge holder [-6] is in the retracted position. Abutting portions 15 that are close to each other with a gap are integrally formed. The positioning abutment] 4 is for retracting the cartridge holder 16;'1. (1'7
When the arm is placed in the position, one end of the arm is
, ζ, ゛car] so as to receive the rotational reaction force of the torsion coil spring 13, ridge holder "164;-,,,,,,
, (thread 1''i - constitutes the first interlock 41°9).

At the end opposite to the positioning abutment part 4 of the ground 10, there is a rectangular frame-shaped mounting (s △, -S8
is rotatable via the connecting shafts 22 on both sides (S, and a torsion coil spring attached to the connecting shafts 22) is biased in the rotational direction and suspended on the mounting base 8. A feed shaft 5 extending in the radial direction of the disk is fixed, and a magnetic field modulation head 1 is fixed to the feed shafts 1 to 5 as shown in FIG.

A mounting base 21 is movably supported.

A rectangular cylindrical linear motor coil 2 is fixed to the upper surface of the mounting base 2, and a linear motor coil 2 is fixed to the mounting base 8, and a linear motor coil 2 is inserted into the mounting base 8. Both ends of the yoke 7 are fixed. The linear motor 1, the linear motor magnet 6, the linear motor yoke 7, etc. are used to drive the magnetic field modulation head along the feed shaft 5. to be accomplished. In addition, the linear scale slit plate 4 is fixed to the base 8 with both ends overlapping with the overlapping near motor magnet 1-6, and the slit 7h4a of the linear scale slit plate 4 is detected. The detection unit 3 is attached to the mounting base 21 of the magnetic field modulation head 1. Configure the detection sensor.

Furthermore, positioning protrusions 25 are fixed to both edges in the disk radial direction of the cartridge holder 16 between the edges [j16a], and a positioning abutment 9 that comes into contact with the positioning protrusions 25 when the car 1 edge holder 16 is lowered. is formed integrally with the linear motor yoke 7 in the form of an extended end of the magnet yoke 7). The positioning abutment portion 9 and the positioning protrusion 25 constitute positioning means for positioning the mounting base 8 at a predetermined height position.

Further, a positioning abutment portion 17 is identified on the edge of the lower surface of the storage base 8 on the side of the support shaft 23, which abuts the cartridge holder 16 from below when the cartridge holder 16 is in the retracted position. This positioning abutment part 17 is
A second engagement means is configured to engage the end of the mounting base 8 on the support shaft 23 side with the car 1-ridge holder 16 in a retracted position of the car 1-ridge holder 16 so as to receive the rotational reaction force of the torsion coil spring 11. .

Next, I will explain the operation.

A disk cartridge 20 is attached to the magneto-optical disk device described in 1.
When loading the disc cartridge 20, the disk cartridge 20 is placed on the cartridge holder 16 that is pushed out from the opening at the front of the device, and then the cartridge holder 16 is pulled into the inside of the device. The position shown in FIG. 2 (height position of arrow A) is the retracted position of the cartridge holder 16, and in this cartridge holder retracted position, the arm base]0
is biased in the clockwise direction in FIG. 2 by the torsion coil spring 13, and the positioning abutments 1 and 4 hit the car) and ridge holder 16, so that it is held horizontally as shown in the figure. Further, the attachment base 8 rotatably supported at the tip of the arm base 10 via a connecting shaft 22 17 is applied with a force in the counterclockwise direction in FIG. hits the cartridge holder 16 from below and is also held horizontally, thus holding the arm base 10 and the mounting base 8 in predetermined initial positions as shown in FIG.

Next, in order to move the magneto-optical disk 19 to a predetermined operating position, when the cartridge holder] 6 is lowered to the height position indicated by arrow B in FIG. 3, the support shaft 23 is lowered together with the cartridge holder 16, and the arm base 10 is about to go down. However, since the arm base abutment part 15 that is integral with the arm base 10 abuts against the chassis base 18, the arm base 1o is relatively pushed by the arm base abutment part 15, as shown in FIG. Rotate counterclockwise around the support shaft 23 with 4
However, the connecting shaft 22 at the tip of the arm base 10 drops down, and the mounting base 8 supported by this connecting shaft 22
is lowered, and the positioning abutment part 9 of the base 8 comes into contact with the positioning protrusion 25, and the base 8 is positioned at a predetermined height position as shown in FIG. In this way, the magnetic field modulation head supported on the take-off base 8 via the feed shaft 5 is positioned at a predetermined height position with respect to the magneto-optical disk 19.

At the above-mentioned predetermined position, the magnetic field modulation head 1 is moved along the feed shaft 5 by a feed drive linear motor composed of a linear motor coil 2, a linear motor magnet 6, and a linear motor yoke 7, and the magneto-optical disk 19 is moved along the feed shaft 5.
Recording or erasing is performed on the magneto-optical disk 19 together with the optical head on the lower surface side. In this case, the position of the magnetic field modulation head 1 in the disk radial direction is detected by a position detection sensor composed of a detection section 3 and a linear scale slit plate 4. The optical head is moved so as to always face the optical head by a feed drive linear motor controlled by the detection signal.

When the disk cartridge 20 is removed from the magneto-optical disk device, the magnetic field modulation head 1 is returned to the initial position shown in FIG. Pull it outward through the front opening.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

The entire magnetic field modulation head, feed drive linear motor, and position detection sensor are mounted on a mounting base supported by a cartridge holder via a link mechanism, and the mounting base lowers as the cartridge holder moves downward when a disk is inserted. The structure moves the magnetic field modulation head to a predetermined height position close to the magneto-optical disk, making it possible to automatically load a magneto-optical disk in the form of a cartridge in a magneto-optical disk device using a magnetic field modulation method, which was previously difficult. and unloading became practically possible.

Furthermore, the above configuration reduces the number of parts and saves space.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic field modulation head feeding mechanism of a magneto-optical disk device showing a third embodiment of the present invention, and FIG. 2 is a side view of the same.
3 is a side view of the magneto-optical disk when it is lowered, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along the line V-V in FIG. 1. DESCRIPTION OF SYMBOLS 1... Magnetic field modulation head, 2... Linear motor coil, 3... Detection part, 4... Linear school slit plate, 5... Feed shaft, 6... Linear motor magnet, 7...・Linear motor yoke 58...Mounting base, 9.14.17...Positioning part, 1o.
...Arm base, 11, 1.3...Torsion coil spring (torsion spring), 15...Arm base abutting part, 1
6...Cartridge holder, 18...Chassis base (stationary part), 1...Magneto-optical disk, 20...
Disc cart rerun, 22... Connection shaft, 23... Support shaft. 25...Positioning protrusion.

Claims (2)

[Claims] (1) A mounting base that includes a feed shaft that movably supports a magnetic field modulation head in the disk radial direction and is supported via a link mechanism by a cartridge holder that holds a disk cartridge; The link mechanism includes a feed drive linear motor that feeds and drives the modulation head in the disk radial direction, and a position detection sensor that is provided on the mounting base and detects the position of the magnetic field modulation head in the disk radial direction. A magnetic field of a magneto-optical disk device, characterized in that the mounting base is lowered so that the magnetic field modulation head is lowered to a predetermined height position close to the magneto-optical disk as the cartridge holder is lowered. Modulating head feeding mechanism. (2) An arm base attached to a cartridge holder that holds a disk cartridge so as to be rotatable in the vertical direction via a support shaft and biased in the rotational direction by a torsion spring, and a position facing the opening provided in the cartridge holder. and a mounting base attached to the arm base via a connecting shaft on the opposite side of the support shaft so as to be rotatable in the vertical direction and biased in the rotational direction by a torsion spring, and both ends fixed to the mounting base. , a feed shaft that supports the magnetic field modulation head so as to be movable in the disk radial direction, and a feed drive that has a linear motor magnet fixed at both ends to the mounting base and drives the magnetic field modulation head along the feed shaft. a linear motor; a position detection sensor provided on the mounting base to detect the position of the magnetic field modulation head in the disk radial direction; and when the cartridge holder is in the retracted position, one end of the arm base is rotated by the rotation of the torsion spring. a first engaging means for engaging the cartridge holder so as to receive a reaction force; and a first engaging means for engaging the cartridge holder in a retracted position of the cartridge holder, for engaging one end of the mounting base with the cartridge holder so as to receive the rotation reaction force of the torsion spring. Second to match
and an arm base abutting portion that is integrally provided at an end of the attachment base opposite to the connection shaft across the support shaft, and that comes into contact with an immovable part such as a chassis base when the cartridge holder is lowered. and a positioning means for positioning the mounting base at a predetermined height position by bringing both ends of the mounting base in the disc radial direction into contact with the cartridge holder when the cartridge holder is lowered. The device's magnetic field modulation head feeding mechanism.