JPH09147441A - Method for aligning recording magnetic head and optical head, magneto-optical recorder and light shielding plate with hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for aligning a recording magnetic head and an optical head capable of automatically aligning the recording magnetic head and the optical head, a magneto-optical recorder and a light shielding plate with hole. SOLUTION: A pseudo magneto-optical disk 81 having a through hole 81a is arranged between the recording magnetic head 9 and a recording/reproducing optical pickup 11, and a quadripartite photoelectric element 30 for light receiving a light beam from the recording/reproducing pickup 11 passing through the through hole 81a is attached to the recording magnetic head 9 corresponding to the recording magnetic head 9. A head adjusting vis 29 is advance/retreat operated based on the light receiving state of the quadripartite photoelectric element 30 for light receiving the light beam passing through the penetration hole 81a, and the attaching position of the recording magnetic head 9 is varied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of aligning a recording magnetic head and an optical head, a magneto-optical recording device, and a perforated light shielding plate.

[0002]

2. Description of the Related Art A magneto-optical disk such as a mini disk capable of freely recording and reproducing a signal projects a light beam at a predetermined position thereof and at the same time, by applying a magnetic field to the light beam projection position, the light beam is generated. A signal can be recorded by heating the magnetic layer at the projected position and magnetizing the magnetic layer in a predetermined magnetization direction. Further, the signal recorded on the magneto-optical disk can be reproduced by receiving the reflected light of the light beam projected on the magnetic layer. Therefore, in a magneto-optical recording / reproducing apparatus for recording / reproducing a signal on / from a magneto-optical disk, a magnetic head for recording a signal on the magneto-optical disk mounted therein and an optical pickup for recording / reproducing are provided. It is necessary to perform alignment so that the positions match. Therefore, conventionally, in order to adjust their positions, a transparent cartridge containing a transparent disc is loaded into a magneto-optical recording / reproducing apparatus, the disc is seen through to determine the recording / reproducing optical pickup, and the above-mentioned is visually observed. Adjustment work is performed to align the recording / reproducing optical pickup with the recording magnetic head.

[0003]

However, the adjustment work for visually aligning the recording magnetic head and the recording / reproducing optical pickup is troublesome, and the alignment error is large due to human work. There is a problem such as. In view of the above problems, the present invention is capable of accurately and automatically aligning a recording magnetic head with an optical pickup, a method of aligning a recording magnetic head with an optical pickup, a magneto-optical recording device, and a light shield having a hole. The purpose is to provide a plate.

[0004]

A method of aligning a recording magnetic head and an optical head according to a first aspect of the present invention includes a recording magnetic head facing each other with a magneto-optical recording medium in between, and an optical head for emitting a light beam. In the method for aligning and, the photoelectric element for receiving the light beam is attached in association with the recording magnetic head, and magnetic head moving means for moving the attaching position of the recording magnetic head is provided, Depending on the light receiving state of the photoelectric element that receives a light beam that has passed through the hole of the perforated light shielding plate by interposing a perforated light shielding plate in place of the magneto-optical recording medium between the element and the optical head. The magnetic head moving means is driven to move the mounting position of the recording magnetic head, and the recording magnetic head and the optical head are aligned with each other.

In the magneto-optical recording apparatus according to the second aspect of the present invention, a magneto-optical recording medium can be loaded, and the recording magnetic head and the optical head for emitting a light beam are opposed to each other with the magneto-optical recording medium sandwiched therebetween. In a magneto-optical recording device for recording a signal on a magneto-optical recording medium, a photoelectric element mounting portion for mounting a photoelectric element for receiving the light beam in association with the recording magnetic head, and a recording magnetic head And a moving means mounting portion for mounting the magnetic head moving means for moving the mounting position.

A perforated light-shielding plate according to a third aspect of the invention is characterized in that it is made of a light-shielding material having a predetermined size, and holes are formed at appropriate positions to penetrate in the thickness direction.

In the present invention, a perforated light shielding plate having a hole penetrating in the thickness direction is arranged between the recording magnetic head and the optical head. Further, a photoelectric element associated with the recording magnetic head is arranged between the recording magnetic head and the light-shielding plate with a hole so that the light receiving surface faces the through hole. When the optical head is moved and the light beam emitted by the optical head passes through the hole of the perforated light blocking plate, the light beam is incident on the photoelectric element, and the light receiving state of the photoelectric element depends on the position of the optical head and the through hole. The light receiving state is set according to the deviation. When the photoelectric element is moved together with the recording magnetic head based on the light receiving state of the photoelectric element and the photoelectric element is positioned at the position where the light receiving state of the photoelectric element is in the best state, the recording magnetic head and the optical head are correctly aligned. The registered state is reached. A signal can be recorded on the magneto-optical recording medium by removing the photoelectric element and the perforated light shielding plate. This allows the recording magnetic head and the optical head to be accurately and automatically aligned.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a schematic configuration diagram of a main part of a magneto-optical recording / reproducing apparatus. The audio signal input to the analog signal input terminal 1 is analog / digital (A / D)
It is input to the conversion circuit 2 and converted into a digital signal.
The converted digital signal is input to the encoder / decoder of the ATRAC processing circuit 3 and converted into a digital signal which is compressed and highly efficient coded. , The writing is controlled by the memory controller 4 and written in the semiconductor memory 5.

The signal read from the semiconductor memory 5 by the memory controller 4 is input to the encoder / decoder of the digital signal processing circuit 6, the input signal is interleaved, an error correction code is added, and a subcode signal is further added. It is converted to the added digital signal. A signal output from the digital signal processing circuit 6 is input to a head drive circuit 7 that converts the signal into a signal for recording on a magneto-optical disk 8 by a recording magnetic head (hereinafter referred to as a magnetic head) 9. The output signal of the head drive circuit 7 is input to the magnetic head 9 arranged so as to face the upper surface of the magneto-optical disk 8.

Further, when recording a signal on the magneto-optical disk 8, a light beam is emitted from the optical pickup 11. The magneto-optical disk 9 is driven to rotate by a spindle motor 10. A recording / reproducing optical pickup (hereinafter referred to as an optical pickup) 11 arranged so as to face the lower surface of the magneto-optical disk 8 emits a light beam when reproducing a signal from the magneto-optical disk 8. The reflected light is received and the signal reproduced from the magneto-optical disk 8 is converted into a digital signal. The optical pickup 11 is configured to move together with the magnetic head 9 in a direction indicated by an arrow, that is, a radial direction of the magneto-optical disk 8 via a feed screw (not shown) by driving the feed motor 12.

The output signal of the optical pickup 11 is input to the digital signal processing circuit 6, subjected to processing such as error correction by the decoder thereof, and then input to the memory controller 4, and the semiconductor memory 5 is controlled by the writing control of the memory controller 4. Written in. Further, the signal read from the semiconductor memory 5 by the read control is input to the ATRAC processing circuit 3, expanded by the audio compression decoder of the ATRAC processing circuit 3, and returned to the original digital signal. The digital signal is input to the digital / analog (D / A) conversion circuit 14 and demodulated, and the analog signal output terminal 1
5 is output.

Further, the key input of the key 19 for instructing each operation mode of recording, reproduction, fast-forward and fast-reverse of the mechanism is input to the disc control circuit 16, and the content of the instructed operation mode is displayed on the display section 18. Disk control circuit 16
Controls the servo control circuit 13 by the tracking error signal input from the digital signal processing circuit 6, and the feed motor 1 by the control signal output from the servo control circuit 13.
2 is driven to perform tracking servo in which the optical pickup 11 along with the magnetic head 9 moves in the radial direction of the magneto-optical disk 8 and follows a track. Similarly, a focus servo signal input to the disk control circuit 16 controls the servo control circuit 13, and a control signal output from the servo control circuit 13 changes the facing distance between the optical pickup 9 and the magneto-optical disk 8. Servo is performed.

Further, the speed signal output by being processed by the digital signal processing circuit 6 is input to the disk control circuit 16, the servo control circuit 13 is controlled according to the speed signal, and the spindle motor 10 is converted into the speed signal. It can be rotated at the corresponding speed. Further, the speed of the spindle motor 10 is controlled according to the key input to the disk control circuit 16.

FIG. 2 is a sectional view of the radius portion of the magneto-optical disk 8. In the range where a predetermined distance is defined from the innermost side of the magneto-optical disk 8 to the outer peripheral direction, the data of the disk is recorded,
It is a reproducible lead-in area 20, and the area adjacent to the outer peripheral side and defining a predetermined distance toward the outer peripheral side is
The content of the recorded data is a UTOC area 21 in which the data can be recorded and reproduced. Further, a range adjacent to the UTOC area 21 and defining a predetermined distance in the outer peripheral direction is a program area 22 in which music data can be recorded and reproduced,
The lead-out area 23 is on the outer peripheral side adjacent to it.

FIG. 3 is an explanatory view for automatically aligning the recording magnetic head and the optical pickup in the magneto-optical recording / reproducing apparatus when the assembling of the magneto-optical recording / reproducing apparatus shown in FIG. 1 is completed. . When the magnetic head 9 and the optical pickup 11 are aligned, the magneto-optical disk 8 shown in FIG.
Instead, the pseudo magneto-optical disk 81 is loaded. The positional relationship between the pseudo magneto-optical disk 81 and the optical pickup 11 is similar to that of the magneto-optical recording / reproducing apparatus shown in FIG. The magnetic head 9 is mounted on the lower surface of a head mounting plate 32 mounted on a magnetic head arm (not shown) so as to be movable in the radial direction of the pseudo magneto-optical disk 81. A four-division photoelectric element (four-division photodetector) 30, which is a photoelectric element, is disposed between the magnetic head 9 and the pseudo magneto-optical disk 81. The four-division photoelectric element 30 has a central position,
With the center position of the magnetic head 9 aligned, it is detachably and stably attached to a bracket 91 that is a photoelectric element attachment portion attached to the magnetic head 9.

The light receiving surface of the four-division photoelectric element 30 is directed to the pseudo magneto-optical disk 81 side. On the outer peripheral side of the pseudo magneto-optical disk 81 of the magnetic head 9, a head adjusting screw 2 is provided.
The screw support body 31 into which the screw 9 is screwed is attached to the head mounting plate 32 with the head adjusting screw 29 facing the magnetic head 9 side.
Is fixedly attached to the lower surface of the. The axial direction of the head adjusting screw 29 is aligned with the radial direction of the pseudo magneto-optical disk 81. A head adjusting screw connecting portion 33 is attached to the side of the magnetic head 9 facing the head adjusting screw 29, and the tip of the head adjusting screw 29 is screwed into the head adjusting screw connecting portion 33. The magnetic head 9 and the head adjusting screw 29 are connected.

Then, by rotating the head adjusting screw 29, the head adjusting screw 29 moves forward and backward so that the mounting position of the magnetic head 9 can be moved in the radial direction of the pseudo magneto-optical disk 81. . Further, the four-division photoelectric element 30 is also moved in association with the magnetic head 9. The pseudo magneto-optical disk 81 is made of a light shielding material, and a single through hole 81a having a minute diameter is formed at an appropriate position on the surface in a direction orthogonal to the surface. The pseudo magneto-optical disk 81 is loaded in a transparent cartridge 171.

The detection signal of the four-division photoelectric element 30 is input to the position measuring device 24, and the measurement data of the position measuring device 24 is stored in the semiconductor memory 26 via the arithmetic unit 25. The drive device 27 is controlled based on the calculation result of the calculation device 25, and the adjustment screw drive unit 28 that drives the head adjusting screw 29 is driven by the control voltage output from the drive device 27, and the head adjustment is performed according to the calculation result. The service screw 29 is rotationally driven to move forward and backward.

Next, an operation of aligning the magnetic head and the optical pickup by the magneto-optical recording apparatus having the above-described structure will be described. First, the center position of the four-division photoelectric element 30 is opposed to the through hole 81 a of the pseudo magneto-optical disk 81. Then, after the light beam is emitted from the optical pickup 11, the feed motor 12 is driven to move the optical pickup 11 to the position of the through hole 81 a of the pseudo magneto-optical disk 81. Then, the light beam emitted from the optical pickup 11 passes through the through hole 81a and enters the four-division photoelectric element 30, and the four-division photoelectric element 30 receives it.
The four-division photoelectric element 30 has a well-known four-division photodetector, and the received light data after voltage amplification of the detection signal of each photodetector is input to the position measuring device 24, and the position measuring device 2
The position measurement data output from No. 4 is input to the arithmetic unit 25 and stored in the semiconductor memory 26.

Then, the arithmetic unit 25 calculates the position of the magnetic head 9 based on the input position measurement data, and when a control signal based on the calculated position measurement data is input to the drive unit 27, the drive unit 27 outputs a control signal. The control voltage according to the above is input to the adjustment screw drive unit 28. As a result, the head adjusting screw 29 is driven to advance, for example, and the mounting position of the magnetic head 9 moves to the inner peripheral side of the pseudo magneto-optical disk 81. Then, the light receiving state of the four-division photoelectric element 30 changes, the position measurement data output from the position measurement device 24 changes, and the position measurement data is input to the arithmetic device 25. As a result, the arithmetic unit 25 fetches the position measurement data previously stored in the semiconductor memory 26, calculates the fetched position measurement data and the position measurement data input from the position measuring unit 24, and the optical pickup 11 And the state of the head 9 are calculated, and the head adjusting screw 29 is driven again in accordance with the amount of the positional deviation to move the mounting position of the magnetic head 9 to the center position of the optical pickup 11. , So as to match the center position of the magnetic head 9,
That is, the mounting position of the magnetic head 9 is moved so that the four light detecting portions of the four-division photoelectric element 30 have the same light receiving state.

Here, at the point where the center position of the optical pickup 11 and the center position of the magnetic head 9 coincide with each other, the light receiving states of the four divided photodetection portions of the four-division photoelectric element 30 are all equal. Although it is the position, a certain degree of error is practically allowed.

In this way, by comparing the position measurement data detected based on the light beam incident on the four-division photoelectric element 30 with the position measurement data stored in the semiconductor memory 26, the magnetic head 9 and Optical pickup 1
The position shift amount from 1 is calculated by the calculation device 25, and the control voltage corresponding to the calculated position shift amount is input to the drive device 27 again, so that the drive device 27 outputs the adjustment screw drive unit 28. Then, a control voltage according to the amount of positional deviation can be input to move the mounting position of the magnetic head 9, and the magnetic head 9 and the optical pickup 11 can be accurately aligned with each other. The operation of performing such alignment is controlled by the software of the microcomputer so as to end when the amount of positional deviation between the magnetic head 9 and the optical pickup 11 reaches a predetermined error range.

The magnetic head 9 and the optical pickup 1
After the alignment operation with 1 is completed, the four-division photoelectric element 30 and the pseudo magneto-optical disk 81 are removed. As a result, the alignment between the magnetic head 9 and the optical pickup 11 is completed, and the center position of the magnetic head 9 and the center position of the four-division photoelectric element 30 are associated with each other via the bracket 91. If the deviation is within the allowable error range, the magnetic head 9 and the optical pickup 11 can be matched with each other with high accuracy. As described above, the driving direction of the magnetic head 9 is one direction in the radial direction of the pseudo magneto-optical disk 81, but it may be driven in two directions, that is, the radial direction and another direction orthogonal to the radial direction.

Although the pseudo magneto-optical disk 81 is used in the embodiment of the invention, the pseudo magneto-optical disk 81 is used.
The same effect can be obtained by using a perforated light shielding plate which can be loaded in the same manner as the above and is not a magneto-optical disk having the same through hole. The present invention is not limited to the magneto-optical recording / reproducing apparatus,
The same effect can be obtained even in a magneto-optical recording device that simply records a signal on a magneto-optical disk.

[0025]

As described above in detail, according to the first and second aspects of the invention, the light beam emitted from the optical head is passed through the through hole of the perforated light shielding plate to enter the photoelectric element, and By moving the mounting position of the recording magnetic head based on the light receiving state, the recording magnetic head and the optical head can be accurately moved.
Moreover, it is possible to provide a method of aligning a recording magnetic head and an optical head and a magneto-optical recording device capable of automatically aligning. According to the third invention, it is possible to provide a perforated light shielding plate for automatically aligning the recording magnetic head and the optical head. Therefore, the present invention has excellent effects such that the accuracy of recording a signal on the magneto-optical recording medium can be improved and the reliability of the magneto-optical recording device can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main part of a magneto-optical recording / reproducing device.

FIG. 2 is a sectional view of a radial portion of a magneto-optical disk.

FIG. 3 is an explanatory diagram for automatically aligning a recording magnetic head and an optical pickup according to the present invention.

[Explanation of symbols]

 9 Recording Magnetic Head 11 Recording / Reproducing Optical Pickup 12 Feed Motor 29 Head Adjusting Screw 30 Four-Division Photoelectric Element 81 Pseudo Magneto-Optical Disk (Perforated Light-Shielding Plate) 81a Through Hole 91 Bracket

Claims (3)

[Claims] 1. A method for aligning a recording magnetic head, which opposes a magneto-optical recording medium, and an optical head, which emits a light beam, wherein a photoelectric element for receiving the light beam is used as the recording magnetic head. And a magnetic head moving means for moving the mounting position of the recording magnetic head in association with each other, and a perforated light shielding plate in place of the magneto-optical recording medium is provided between the light receiving element and the optical head. Recording is performed by driving the magnetic head moving means according to the light receiving state of the photoelectric element that receives the light beam passing through the hole of the perforated light shielding plate to move the mounting position of the recording magnetic head. A method of aligning a recording magnetic head and an optical head, characterized by aligning a recording magnetic head and an optical head. 2. A magneto-optical recording medium can be loaded, and a recording magnetic head and an optical head for emitting a light beam are opposed to each other with the magneto-optical recording medium sandwiched therebetween to record a signal on the magneto-optical recording medium. In the magneto-optical recording apparatus, a photoelectric element mounting portion for mounting the photoelectric element for receiving the light beam in association with the recording magnetic head, and a magnetic head moving means for moving the mounting position of the recording magnetic head. A magneto-optical recording device, comprising: a moving means mounting portion for mounting the. 3. A perforated light-shielding plate comprising a light-shielding material having a predetermined size and having holes penetrating in a thickness direction formed at appropriate positions.