JPH02195547A - Magneto-optical recorder - Google Patents

Abstract

PURPOSE:To suppress heat generated from a magnetic field coil and to enhance heat radiation ability by fixing a magnetic bias coil on a part of a case holder when a case housing a recording medium is inserted or ejected and providing an auxiliary magnetic coil moving integrally with a head on a position opposed to the bias coil and around the objective lens of an optical head. CONSTITUTION:The magnetic bias coil 6 which is a guide at the time of loading and unloading a disk and is mounted on the upper surface of the case holder 5 is fixed so as to cover the recording area of the disk. Meanwhile, the auxiliary coil 8 pairing with a fixing coil 6 is provided on the periphery of the objective lens of the opposed magnetic head 7 and it can move with the head 7. Thus, load applied to one coil is reduced and heat radiation effect by the holder whose surface area is large is enhanced. The heat generated in a drive is suppressed and local temperature rise is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical recording device. More specifically, the present invention relates to improvements in magnetic bias coils for magneto-optical recording devices.

[Prior Art] FIG. 3 is a perspective view of the main parts of a magneto-optical recording device related to the present invention. The laser light emitted from the objective lens 2 of the lens actuator 1 is irradiated onto the magneto-optical medium 3,
The reflected light returns to the objective lens from which it came. This laser light carries information on the medium, and that information is converted into rotation of the plane of polarization of the light. This is converted into light intensity signals using an analyzer and photodetector and extracted.

To rewrite information, after turning on the magnetic bias coil 4, continuous light is applied to the magnetic medium to erase the previous data. Next, the direction of the current flowing through the magnetic bias coil is changed to change the polarity, and then laser pulse light is irradiated onto the medium to record.

[Problems to be Solved by the Invention] Now, in such magneto-optical recording devices, the influence of heat generated from the magnetic bias coil when erasing and writing data has become a problem. i.e. 100-500 on the medium
Generating the Ørsted magnetic field consumes several watts of power. As a result, during continuous erasing and writing, the coil temperature exceeds 100 degrees, the local temperature of the disk directly under the coil increases, and the internal temperature of the drive rises to 70 degrees.
This is creating a situation where it will rise above C. This adversely affects the optical head, disk, etc., making it difficult to obtain stable reproduction signals and perform stable servo.

The present invention solves these problems and provides a structure that suppresses heat generation from the magnetic field coil and has good heat dissipation.

[Means for Solving the Problems] The present invention provides a recording device using a magneto-optical medium, in which a part of the case holder, which serves as a holding member when a case containing the recording medium is inserted into and ejected from the recording device, is provided with a magnet. This magneto-optical recording device is characterized in that a bias coil is fixed, and an auxiliary magnetic coil that moves integrally with the optical head is provided at a position opposite to the bias coil and around the objective lens of the optical head.

[Function] Since the magnetic field coil is attached to a disk case holder with a large surface area and good heat dissipation, the rise in temperature of the coil can be suppressed. Furthermore, since an auxiliary coil is provided opposite to the main coil, magnetic flux can be concentrated and an efficient magnetic field can be generated.

[Example] FIG. 1 is a plan view illustrating the invention in detail.

Further, FIG. 2 is a side view thereof. Case holder 5 that serves as a guide when loading and unloading discs
The magnetic bias coil 6 attached to the upper surface of the disc is fixed so as to cover the recording area of the disc, and at this time, it is desirable to design the contact surface between the coil and the disc holder to be as large as possible. On the other hand, on the periphery of the objective lens of the opposing magnetic head 7, there is an auxiliary coil 8 that pairs with the fixed coil, and this coil is movable together with the head. Therefore, with the fixed coil and this auxiliary coil,
The magnetic field necessary for writing and erasing is formed on the disk 9 in a concentrated manner, and an area with the highest magnetic flux density can be created at the access location of the head. The state of the magnetic field lines is shown in the second
It is shown cartoonishly in the figure. That is, the perpendicular magnetic field generated by the fixed coil 6 completely covers the recording area of the disk.

The magnetic field generated by the moving coil 8 is superimposed on this, creating a region with a high magnetic field as shown in the figure, and the setup is made so that the laser spot hits the center of this field with high magnetic field density. Therefore, by dividing the magnetic field coil into two
In addition to reducing the load on the individual coils, the heat dissipation effect due to the large surface area of the holder increases, and the object of the present invention is achieved.

Note that 10 is a spindle motor, and its hub surface is shown. The disk is not installed. 11 is a disc case.

[Effects of the Invention] As described above, the present invention improves the heat dissipation effect of the bias magnetic field coil, which is one of the major causes of heat generation in magneto-optical devices, by vertically positioning a single coil that has been conventionally used. By splitting the drive and attaching the fixed coil to a disk holder with good heat dissipation, heat generation within the drive is suppressed and local temperature rises are also eliminated. As a result, the write/erase characteristics of the optical drive have become stable, and the environmental temperature characteristics have also been improved.

[Brief explanation of the drawing]

1 and 2 are configuration diagrams of the present invention, the former being a plan view and the latter being a side view. FIG. 3 is a perspective view of a conventional magnetic bias coil. Applicant Seiko Epson Co., Ltd. Agent Patent attorney Nozomi Uecomb and 1 other person Day % 1] Item

Claims (1)

[Claims] In a recording device using a magneto-optical medium, a magnetic bias coil is fixed to a part of a case holder that serves as a holding member when a case containing the recording medium is inserted into and ejected from the recording device, and a magnetic bias coil is fixed at a position opposite to the case holder. A magneto-optical recording device further comprising: an auxiliary magnetic coil that moves integrally with the optical head around the objective lens of the optical head.