JP2993207B2 - Adjustment device for magneto-optical disk head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head adjusting device provided for recording and reading data in a magneto-optical disk recording and reproducing apparatus.

[0002]

2. Description of the Related Art A magneto-optical disk recording / reproducing apparatus capable of recording data in response to a laser beam and reading the data includes an optical head for irradiating a recording surface of an optical disk with a laser beam, and an optical head. And a magnetic head that applies a magnetic field that is reversed according to recording data, and a head assembly in which these are integrated moves in the radial direction of the magneto-optical disk.

FIG. 3 shows the relationship between the head structure 30 and the magneto-optical disk 1. Numeral 1 denotes a magneto-optical disk rotated by a spindle motor (not shown).
0 denotes the optical head 11 in the radial direction of the magneto-optical disk 1.
Is a linear motor that can move the linear motor.

The optical head 11 irradiates a laser beam to a recording track formed on the lower surface of the magneto-optical disk 1. A magnetic head 12 is provided at a position opposing the optical head 11, and A magnetic field that reverses according to the recording data is applied from the upper surface of the recording medium 1. Reference numeral 13 denotes a connecting arm connecting the optical head 11 and the magnetic head 12, and the connecting arm 13 regulates the optical head 11 and the magnetic head 12 at predetermined positions opposed to each other.

In such a magneto-optical disk drive, when the linear motor 10 performs head feed to track a spirally formed recording track, and when a desired recording track is accessed, Then, the optical head 11 and the magnetic head 12 move integrally. At the time of recording, a strong laser beam spot is irradiated from the optical head 11 onto the recording surface of the magneto-optical disk 1, and the temperature within the small irradiation spot (0.6 μmφ) rises to the Curie point temperature.
Then, data is recorded by magnetizing the recording surface in the direction of the magnetic field applied from the magnetic head 12.

[0006]

In the case of such a magneto-optical disk recording system, the linear motor
Is required to be as small and light as possible in order to improve access speed and ease of tracking control, and the magnetic field applied from the magnetic head 12 modulated by data is It is necessary to maximize at the recording spot position. Therefore, the mounting position of the optical head 11 is adjusted, for example, so that the error between the center position of the light spot irradiated from the optical head 11 and the center position of the magnetic field applied from the magnetic head 12 is at least within ± 0.3 mm. It is necessary to strictly adjust with screws 14, 14,...

Conventionally, in order to perform such position adjustment,
While observing the condensed light beam directly with a microscope, moving the light emitting element on the xy stage, or irradiating the light beam to a 4-split detector to detect the center position,
Using a Hall element to detect the center position of the magnetic field,
The support was moved on an xy table to obtain a magnetic field intensity distribution, and a peak magnetic field point was found. However, obtaining the center point of the light beam and the center point of the magnetic field strength by the above two methods has a problem that the apparatus becomes large and the position detection work becomes complicated, which is not efficient.

[0008] Further, even after both center positions are detected,
Since there is no reference for aligning the optical head 11 and the magnetic head 12 with the center point, there has been a problem that accurate adjustment becomes extremely difficult in practice. or,
It is considered that the center positions of the optical head 11 and the magnetic head 12 are mechanically measured to align the center position of the beam of the optical head 11 with the center of the magnetic field of the magnetic head 12, but in this case, within ± 0.3 mm. Since the alignment is performed, there is a disadvantage that the assembly accuracy of the head structure and the cost of parts are increased, and the burden on manufacturing is increased.

[0009]

According to the present invention, a first sensor element (Hall element) for generating an electric output in response to a magnetic field is provided on one surface in order to solve such a problem. A chip member provided with a second sensor (photoelectric element) for outputting an electric signal in response to light on the other surface is attached to an arm member movable in three axial directions, and an optical head is used by using the arm member. This device constitutes a device that can be adjusted so that the center positions of the magnetic head 11 and the magnetic head 12 match.

[0010]

The chip member formed in a plate shape is carried into the space where the optical head 11 and the magnetic head 12 face each other, and the light beam emitted from the optical head 11 is set to be at the center position of the second sensor. I do. Then, the magnetic head 1 is controlled so that the detection signal output from the first sensor is maximized.
By adjusting the mounting position of 2, the adjustment work of the head structure of the magneto-optical disk is completed.

[0011]

FIG. 1 shows an outline of a magneto-optical disk head adjusting apparatus 20 according to the present invention.
Shows a three-axis mechanism that can move the arm member 23 in the three-axis xyz axis direction.
A, 22B, and can be controlled by a fine adjustment control motor incorporated therein.
The arm member 23 can be controlled in the y direction.

A connector 24 is provided at the tip of the arm member 23. As will be described later, a chip member 25 having sensor elements provided on both sides is inserted into the connector 24. A jig 26 is mounted on the measuring table 21 so that the head structure 30 to be adjusted of the magneto-optical disk is fixed. On the panel surface of the magneto-optical disk head adjusting device 20, two indicating instruments 20A and 20 are provided.
B and various operation knob switches 20C are provided.

FIG. 2 is a front plan view (a), a side view (b), and a rear plan view (c) showing an example of the chip member 25. On the front surface, as a first sensor that outputs an electric signal sensitive to a magnetic field, for example, a Hall element 25
A is provided, and, for example, a light receiving element 25B is provided on the rear plane as a second sensor sensitive to light.

The light receiving element 25B is a four-divided ABCD,
A connector pin 25C for outputting each light receiving output individually is provided. The chip member 25 may be integrally formed on a semiconductor substrate by IC technology, but may be formed by molding each sensor element.

Hereinafter, an optical head 11 and a magnetic head 1 for forming a head structure of a magneto-optical disk using this apparatus will be described.
The method of adjusting the relative position of the second will be described. First, as shown in FIG. 1, an H head structure 30 for adjustment is fixed on a measuring table 21 by a jig 26, and the triaxial mechanism 22 is driven to be attached to a tip of an arm member 23. The tip member 25 is set so as to be positioned on the objective lens of the optical head 11 of the head assembly 30. Then, a laser beam is emitted from the optical head 11 in this state.

When the irradiation spot of the laser beam is located on the photoelectric element 25 B of the chip member 25, the photoelectric output is input to the adjusting device 20. The adjusting device 20 outputs the photoelectric output of the four-divided detector ABCD as E _A ,
When E _B , E _C , and E _D , (E _A + E _D )
The calculation output of − (E _B + E _C ) and (E _A + E _C ) − (E
_B + calculated output becomes zero so that the position setting E _D) is performed. This position setting can be automatically set by automatically driving the three-axis mechanism 22 by the microcomputer in the adjusting device 20.

Next, after the light receiving element 25B of the chip member 25 and the center position of the laser irradiation spot of the optical head 11 match, an electric current is applied to the magnetic head 12 to
A magnetic field is applied to the surface of No. 5. Since the intensity of this magnetic field is the electric output of the Hall element 25A forming the first sensor, while monitoring the electric output E _M with the indicator 20B,
The position of the magnetic head chip 12A is manually adjusted. In this position adjustment, while detecting the output of the hall element,
It may be performed automatically by a jig.

Then, a position where the electric output E _M is maximized is searched for, and the center point of the magnetic field applied from the magnetic head 12 and the center of the Hall element 25A are matched. In addition,
By finely adjusting the position of the magnetic head chip 12A at a point where the maximum output can be obtained while reducing the strength of the magnetic field at this maximum point, the center of the magnetic field and the Hall element 25 are adjusted.
The centers of A coincide exactly.

By the above adjustment, the center magnetic field position of the magnetic head 12 paired by the head structure 30 and the laser beam irradiation position of the optical head 11 completely match. The adjusted head structure 30 is directly attached to a linear motor of a magneto-optical disk, and can be incorporated as a head of a magneto-optical disk recording / reproducing apparatus. In addition,
The adjusting device 20 of the present invention can be arranged in a production line of an optical device, and can be adjusted while the head structure 30 is attached to the linear motor.

[0020]

As described above, the head adjustment device for a magneto-optical disk according to the present invention has a tip member attached to the tip of an arm member movable in three axial directions, and the front and back surfaces of the tip member are attached. The first is sensitive to magnetic fields and light,
And the second sensor are provided so that the center positions of the two sensors coincide with each other, so that the center positions of the optical head and the magnetic head attached to the head assembly for recording / reproducing the magneto-optical disk can be adjusted. There is an advantage that alignment can be easily performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an apparatus for adjusting a magneto-optical disk according to the present invention.

FIG. 2 is a front and back plan view and a side view of a chip member for detecting a light beam and an applied magnetic field.

FIG. 3 is an explanatory diagram of a magneto-optical disk recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Optical head 12 Magnetic head 20 Adjusting device 22 3-axis mechanism 23 Arm member 25 Chip member 25A Hall element 25B 4 divided photoelectric elements

Claims (1)

(57) [Claims] A first sensor element for outputting an electric signal in response to an applied magnetic field is provided on one surface, and a second sensor element for detecting the position in response to a light spot is provided on the other surface. A chip member provided on the surface and arranged so that the center position of the first sensor element and the center position of the second sensor element coincide with each other, is attached to the distal end portion of a measurement member that is movable in three axial directions. An adjusting device for a magneto-optical disk head, wherein the adjusting device is mounted.