JP2001307302A - Optical head for magneto-optical recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a temperature increase for the recording layer of a magneto-optical recording medium caused by heat generated by a magnetic field generating means, regarding an optical head for magneto-optical recording. SOLUTION: This optical head for magneto-optical recording is provided with an optical lens system 5, a magnetic field generating means 7, and a slider 3 floated by an air flow following the rotation of a magneto-optical recording medium 20 or slid into contact with the surface of the magneto-optical recording medium 20. A Peltier element is disposed to cool the magnetic field generating means 20 on the slider 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head for magneto-optical recording and, more particularly, to a cooling structure of a magnetic field generating means.

[0002] In the magnetic field modulation recording system, a laser beam for recording is focused by a condenser lens onto a recording layer of a magneto-optical recording medium (hereinafter, abbreviated as a medium) to irradiate the recording medium. Bring the temperature of the layer closer to the Curie point,
In this state, a required high-frequency current modulated based on the recording information is passed through a magnetic field generating modulation coil (hereinafter abbreviated as a coil) to apply a vertical magnetic field generated, thereby changing the perpendicular magnetization direction of the recording layer of the medium. The information is recorded on (or erased from) the recording layer by reversing it.

In an optical head for magneto-optical recording of a type in which a condensing lens and a coil are mounted on a slider and float at a very small distance from the medium surface or slide on the medium surface, a high-frequency current is applied to the coil. Then, heat is generated due to the impedance of the coil, and the heat raises the temperature of the recording layer of the medium, so that there is a problem that recording on the recording layer cannot be performed normally. Therefore, there is a demand for an effective cooling structure for suppressing a rise in the temperature of the recording layer of the medium.

[0004]

2. Description of the Related Art For example, magneto-optical recording by a magnetic field modulation head for magneto-optical recording according to a magnetic field modulation method described in Japanese Patent Application Laid-Open No. 3-58303 is applied to one side of a medium 30 as shown in FIG. Condensing lens 32 that condenses laser light 31 on the surface side of the recording layer 30 and irradiates the condensing point 31a of the recording layer 30a
And a magnetic field modulation head 34 for magneto-optical recording, on which a coil 33 is mounted at a fixed distance from the surface of the medium 30 on the back side of the recording layer 30a, to record information on the recording layer 30a.

The purpose of this is to avoid a head crash caused by contact between the magneto-optical recording magnetic field modulation head 34 and the surface of the medium 30 due to the rotation of the rotating medium 30 or the like. A sufficient current is applied to the coil 33 to generate a strong magnetic field in the coil 33, and the coil 3
The heat generated by the large current 3 is characterized in that the Peltier element 35 is bonded to the magnetic field modulation head 34 for magneto-optical recording and is cooled.

On the other hand, in magneto-optical recording by an optical head for magneto-optical recording by the magnetic field modulation method shown in FIG. 4, a slider 44 having a condenser lens 42 mounted together with an insulating substrate 46 on which a coil 43 is formed is a suspension (not shown). The slider 44 is fixed on a gimbal 45 attached to the tip of the
It floats at an extremely small interval (about several μm) from the surface, or is arranged so as to be in sliding contact with the surface of the medium 40. The information is recorded on the recording layer 40a by irradiating the converging point 41a of the recording layer 40a and applying a vertical magnetic field.

In order to record information on the recording layer 40a precisely, it is necessary that the focal point 41a substantially coincides with the maximum point of the magnetic field modulated by the coil 43. Actually, there is heat conduction, and the highest temperature point is located at a position slightly delayed from the light condensing point 41a. Therefore, the maximum point of the magnetic field is adjusted there.

[0008]

However, the conventional optical head for magneto-optical recording shown in FIG. 4 performs magneto-optical recording in which the condensing lens and the slider having the coil mounted thereon come into close proximity or sliding contact with the medium surface. However, the following problem occurs.

That is, when a high-frequency current is applied to the coil,
Heat is generated by the impedance of the coil. The smaller the coil, the sharper the magnetic field is formed in the center of the coil. However, the smaller the coil, the closer the heating element (slider) nears the focal point. There is a problem that the recording on the recording layer is destroyed due to an increase in temperature.

[0010] In view of the above problems, the present invention, even if the focal point and the maximum point of the magnetic field are in a good positional relationship, the relationship is broken.
It is an object of the present invention to provide an optical head for magneto-optical recording having a cooling structure for suppressing a temperature rise of a recording layer of a medium due to heat generated by a coil.

[0011]

According to a first aspect of the present invention, an optical lens system and a magnetic field generating means (coil) are mounted to achieve the above object. An optical head for magneto-optical recording comprising a slider which floats by air flow or slides on the surface of the magneto-optical recording medium, wherein a Peltier element for cooling a magnetic field generating means (coil) on the slider is provided. It is composed.

With this configuration, the heat generated by the coil can be absorbed and cooled by the Peltier element, so that even if the slider is very close to or in sliding contact with the medium surface,
The temperature rise of the recording layer of the medium can be suppressed.

In the above configuration, the power supply of the Peltier element is supplied via a commutator and a shunt means for shunting a high-frequency current supplied to the magnetic field generating means (coil) into a predetermined amount of current. It is constituted so that.

As a result, the power supply to the coil and the Peltier element on the slider can be left as two power supply lines to the coil. The posture with respect to the surface can be normally maintained.

Further, in the configuration of claim 3, the magnetic field generating means (coil), the Peltier element, and the commutator are
It is formed on a semiconductor substrate by a semiconductor process.

With this arrangement, an increase in the mass of the object mounted on the slider can be suppressed to a minimum, as compared with the case where the sliders are separately formed and combined.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a schematic side sectional view of an optical head for magneto-optical recording according to one embodiment of the present invention, and FIG. 2 is a schematic perspective view of FIG. 1, with a medium facing surface of a slider facing upward for easy understanding. It is shown.

As shown in FIGS. 1 and 2, the cooling structure of the slider in the optical head for magneto-optical recording includes a lens holding hole 3a fixed on a gimbal 2 attached to the tip of a suspension 1 (see FIG. 2). And a condensing lens 5 which is held in a lens holding hole 3a of the slider 3 and condenses a laser beam 4 to irradiate a converging point 4a on a recording layer 20a of a medium 20. A silicon substrate 6 fixed to the surface of the slider 3 facing the medium 20, a spiral coil 7 formed around the light passage opening 6a of the silicon substrate 6, and a coil formed at a position close to the coil 7. Peltier element 8 (in FIG. 2, spiral coil 7)
(A mesh portion superimposed on the top).

The coil 7 can be formed in a spiral shape by forming a conductor on the silicon substrate 6 and performing a patterning process by a known photolithography method.
The Peltier element 8 can form a plurality of pn junctions in the vicinity of the coil 7 by a known semiconductor thin film process, make the cooling pole side close to the coil 7 to absorb the heat generated by the coil 7, and Is fixed to the slider 3 serving as a heat radiating plate to dissipate heat.

The power supply to the coil and the Peltier element is as follows:
If the power supply lines are connected and supplied independently, a total of four power supply lines will be wired to the slider, so that extra spring rigidity is given to the slider by the power supply line. It may cause head crush etc. by tilting.

For this reason, the high-frequency power supply current i is divided into a high-frequency current i ₁ to the coil 7 and a current i ₂ to the Peltier element 8 at point A in FIG. 2 to rectify the resistance element 9 and the thyristor or diode. The current is rectified through the element 10 and supplied to the Peltier element 8. The resistance element 9 outputs the current i to the coil 7
It intended to determine the current i ₁ and the flow ratio to divert the current i ₂ to the Peltier element 8 to its resistance value is determined by the cooling test of the coil 7 along with the design specifications of the Peltier element 8.

The resistive element 9 is formed by forming a resistor on a silicon substrate 6 by a patterning process using a known photolithography method. The commutator 10 is integrated on the silicon substrate 6 by a known semiconductor thin film process. Can be formed.

The commutator 10 rectifies the high-frequency current to the coil 7 and when the direction of the current flowing through the Peltier element 8 is reversed,
This prevents the Peltier element 8 from generating heat in the opposite manner and applying heat to the coil 7.

As shown in FIG. 2, two power supply lines to the coil 7 pass through the center line of the suspension 1 and the gimbal 2, and are led out from the tip of the gimbal 2, and one of them is a coil terminal 1.
1a, and the other is connected to the coil terminal 11b.

The power supply line to the Peltier element 8 is connected to the coil terminal 11a, the resistor element 9 and the commutator 10 in series, and further connected to the Peltier element terminal 12b. Terminal 12a.

The coil terminals 11a and 11b and the Peltier element terminals 12a and 12b are shown on the side surface of the slider 3 in FIG. 2 for easy understanding, but actually on the silicon substrate 6 in FIG. It is formed at the required position.

With this configuration, the heat generated by the coil can be absorbed by the Peltier element to cool the slider electronically, so that the temperature rise of the recording layer of the medium can be suppressed.

In addition, since the power supply to the coil and the Peltier element on the slider can be left as two power supply lines to the coil, the slider is not affected by the spring rigidity due to the increase in the number of wirings, and the medium surface of the slider is not affected. , And a head crash or the like can be prevented.

A vertical magnetic field generating means, a Peltier element,
By integrally forming the flow dividing means and the rectifying means on the silicon substrate by a semiconductor process, each is separate,
An increase in the mass of the object mounted on the slider can be suppressed to a minimum as compared with the case where the combination is used.

[0030]

As described in detail above, according to the present invention,
A condenser lens and a coil are mounted on a slider, and the heat generated by the coil in a magneto-optical recording optical head of a type in which the slider flies at a very small distance from the medium surface or slides on the medium surface is electronically cooled by a Peltier element. Thereby, the temperature rise of the recording layer of the medium due to the heat generation of the coil can be suppressed.

Therefore, it is possible to maintain a good positional relationship between the converging point and the maximum point of the perpendicular magnetic field, and to provide a highly reliable magneto-optical disk device without recording information on the recording layer of the medium. It has an extremely useful effect in industry.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of an optical head for magneto-optical recording according to one embodiment of the present invention.

FIG. 2 is a schematic perspective view of FIG.

FIG. 3 is an explanatory diagram of magneto-optical recording using a conventional magnetic field modulation head.

FIG. 4 is an explanatory view of magneto-optical recording by a conventional optical head for magneto-optical recording.

[Explanation of symbols]

 1: Suspension 2: Gimbal 3: Slider 3a: Lens holding hole 4: Laser beam 4a: Focus point 5: Focus lens (optical lens system) 6: Substrate (silicon substrate) 6a: Light passage port 7: Coil (vertical) 8: Peltier element 9: Resistance element (shunting means) 10: Commutator 11a, 11b: Terminal for coil 12a, 12b: Terminal for Peltier element 20: Medium (magneto-optical recording medium) 20a: Recording layer

Claims (3)

[Claims] An optical system for magneto-optical recording, comprising an optical lens system and a magnetic field generating means, and a slider which floats by an air flow accompanying rotation of the magneto-optical recording medium or slides on the surface of the magneto-optical recording medium. An optical head for magneto-optical recording, comprising: a Peltier element for cooling a magnetic field generating means on the slider. 2. The power supply of the Peltier device is supplied via a shunting means for shunting a high-frequency current supplied to the magnetic field generating means into a predetermined amount of current, and a rectifying means. The optical head for magneto-optical recording according to the above. 3. The optical head for magneto-optical recording according to claim 2, wherein said magnetic field generating means, Peltier element, and commutator are formed on a semiconductor substrate by a semiconductor process.