JPH10214465A - Relative position adjustment disk for magnetic head and optical head and relative position adjusting method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the relative attaching position of an optical head with respect to a magnetic head at the time of assembling them with high accuracy and easily in a disk device performing the servo control of the magnetic head by using the optical head with respect to a magnetic disk having an optical track and a magnetic track. SOLUTION: Scratches 8, 9 locally generating changes in reproducing signals at reproducing states of respective signals are formed over a magnetic signal 2 for adjusting the magnetic head position of a position adjustment disk and a stitch 3 to which an optical head follows up. The relatively positional relation of the scratches 8, 9 is separated by distances of x (μm) with respect to a radial direction and of y (μm) with respect to a tangential direction and is equivalent to the relative position between a magnetic head 4 to be adjusted and a light spot 6 to be irradiated by the optical head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for performing servo control of a magnetic disk having an optical track and a magnetic track by using the optical head. TECHNICAL FIELD The present invention relates to a relative position adjusting disk for a magnetic head and an optical head and a relative position adjusting method using the same, for easily and precisely adjusting a general mounting position.

[0002]

2. Description of the Related Art A floppy disk drive for performing servo control of a magnetic head using an optical head is disclosed in
No. 14436. This is, as shown in FIG. 3, a magnetic signal 2 on a magnetic disk 1 that reflects light.
And a stitch 3 formed of a broken physical groove in a pair, and are formed concentrically with respect to the rotation center O. A magnetic head 4 for reading and writing the magnetic signal 2 and an optical head 5 that follows the stitch 3 by irradiating a light spot and detecting reflected light thereof are attached to a magnetic head carriage (not shown) on the device side. ing.

The optical head 5 includes a light source for irradiating a light spot 6 on the magnetic disk 1 that reflects light, a lens for condensing reflected light, and an electric signal continuously responding to the collected light amount. It is composed of a photosensitive cell or the like having a function of generating light.

In order for the magnetic head 4 to correctly read and write the magnetic signal 2 when the optical head 5 follows the stitch 3, the magnetic head 4 and the optical head 5 are defined by the magnetic signal 2 and the stitch 3. It must be positioned with a certain positional relationship. For example, as shown in the drawing, it is necessary to position the disk with a distance of x (μm) in the radial direction R and a distance of y (μm) in the tangential direction T.

Conventionally, adjustment of the relative position during assembly is performed by
In consideration of the tolerance of each component constituting the optical head 5 and the magnetic head 4, it is manually performed with a positioning jig or the like.

[0006]

However, in recent years, as one method for improving the storage capacity of a floppy disk drive, an improvement in magnetic track density has been required.
Accordingly, the optical system constituting the optical head and the components constituting the magnetic head carriage have also been reduced in size, and there has been a demand for assembling the components with higher precision. With a conventional manual position adjustment technique using a jig, it has become difficult to assemble the relative position between the optical head and the magnetic head within the standard.

[0007]

According to the present invention, in order to solve the above-mentioned problems, an optical track is followed by an optical head, so that a magnetic signal is recorded by a magnetic head in pairs with the optical track. In a disk device that performs servo control so that it can be reproduced, a disk used for adjusting a relative position of a light spot irradiated from an optical head with respect to a magnetic head, wherein a magnetic signal recorded in advance is used. The information that locally changes the reproduction signal of the magnetic head and the information that locally changes the reproduction signal of the optical head on the optical track are formed with relative positions to be adjusted. It is characterized by the following.

Accordingly, it is an object to adjust the relative position between the medium irradiation position of the optical head and the magnetic head with high accuracy and easily.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, an optical head follows an optical track so that a magnetic signal is recorded on a magnetic track paired with the optical track. In a disk device that performs servo control so that it can be read and written by a magnetic head,
A disk used to adjust the relative position of a light spot irradiated from an optical head, and information on a magnetic track on which a magnetic signal has been recorded in advance is provided with information that locally changes the reproduction signal of the magnetic head. , On the light track,
A magnetic head, wherein information giving a local change to a reproduction signal of the optical head is formed equal to a relative positional relationship between a magnetic head to be adjusted and a light spot irradiated by the optical head; It is located on the relative position adjustment disk of the optical head.

According to a second aspect of the present invention, a magnetic signal is read and written by a magnetic head on a magnetic track paired with the optical track by following the optical track with an optical head. A method for adjusting a relative position of a light spot irradiated from an optical head with respect to a magnetic head in a disk device that performs servo control as possible, comprising: Information that locally changes the reproduction signal of the magnetic head, and information that locally changes the reproduction signal of the optical head on the optical track includes the magnetic head and the optical head to be adjusted. Using a disk formed to have the same relative positional relationship with the light spot to be irradiated, the magnetic head is first set on track on the magnetic signal, and then the light spot is set on track. Adjusting the position of the optical head to adjust the relative position of the light spot in the radial direction of the disk, and detecting the pulse generated according to the rotation of the motor that drives the disk, The light spot in the tangential direction of the disk is detected by detecting the time until the head and the optical head detect the information formed on each track, and adjusting the position of the optical head so that both times coincide. And a step of adjusting the relative position of the relative position.

[0011] Thus, the relative position between the medium irradiation position of the optical head and the magnetic head can be adjusted with high precision and easily, regardless of the assembly tolerance of the components of the optical head and the magnetic head carriage system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a plan view of a disk for adjusting a relative position between a magnetic head and an optical head according to an embodiment of the present invention, FIG. 1B is an enlarged view of a portion A, and FIG. 2 uses this disk. FIG. 9 is a waveform diagram of a reproduced signal from a magnetic head and an optical head obtained in the case.

In FIG. 1, only one magnetic signal 2 and one stitch 3 are formed on a relative position adjusting disk 1. The previously recorded magnetic signal 2 is transmitted to the magnetic head 4
The stitch 3 is used for adjusting the position of the optical head 5.

On the circumference of the magnetic signal 2, a scratch (scratch) 8 for locally causing some change in the reproduction signal in the reproduction state of the magnetic signal, and also on the circumference of the stitch 3. A scratch 9 for locally causing some change in the reproduction signal from the optical head 5 is formed at one place on the circumference by using a laser writer or the like.

The scratches 8 and 9 are formed at a distance of x (μm) in the radial direction of the relative position adjusting disk 1 and at a distance of y (μm) in the tangential direction. This positional relationship is equal to the relative position between the magnetic head 4 and the light spot 6 irradiated by the optical head 5.

A relative position adjusting method using the relative position adjusting disk 1 configured as described above will be described. First, the relative position adjustment disk 1 is rotated to keep the magnetic head 4 in the reproducing state, and the magnetic head carriage is gradually sought. The magnetic signal 2 recorded at a predetermined frequency is detected by the magnetic head 4 and fixed at a position where the amplitude of the reproduced signal is maximized. That is, the magnetic head 4 is turned on the magnetic track on which the magnetic signal 2 is recorded.

At this time, since a physical scratch 8 is formed at a certain position on the magnetic signal 2 by using a laser writer or the like, the amplitude of the reproduced signal is reduced due to disturbance of the magnetic material distribution on the surface of the relative position adjusting disk 1. appear. FIG. 11 shows a waveform diagram of a reproduced signal from the magnetic head 4 in this state.

In this state, the optical head 5 is gradually moved in the radial direction axis to detect the scratch 8 and is fixed at a position where the amplitude of the reproduced signal of the optical head 5 becomes maximum. That is, when the optical head 5 is turned on the optical track formed by the stitch 3, the adjustment of the optical head 5 to the radial adjustment position is completed.

At this time, the amplitude of the reproduced signal greatly changes due to the wide scratch 9 processed at a certain position on the stitch 3. A waveform diagram of a reproduced signal from the optical head 5 in this state is shown in FIG.

Next, adjustment of the relative position of the optical head 5 with respect to the magnetic head 4 in the tangential direction will be described. The pulse indicated by 10 in FIG. 2 is a motor index indicating that the disk is rotating at a constant period. The period indicated by 13 is the time from when the motor index 10 is detected to when the magnetic head 4 detects the scratch 8 for the first time, which is referred to as a magnetic head scratch time. In addition, a period indicated by 14 in FIG. 2 is a time from when the motor index 10 is detected to when the optical head 5 first detects the scratch 9, which is referred to as an optical head scratch time.

When the distance between the magnetic head 4 and the light spot 6 in the tangential direction is y (μm),
The magnetic head scratch time 13 and the optical head scratch time 14 are equal. However, when the distance between the magnetic head 4 and the light spot 6 is shorter than y (μm), the magnetic head 4 first passes through the scratch 8 after the motor index 10 is detected, and then the light spot 6 passes through the scratch 9. The optical head scratch time 14
Is longer.

Conversely, when the distance between the magnetic head 4 and the light spot 6 is longer than y (μm), the optical head 5 first passes through the scratch 9 after the motor index 10 is detected, and then the magnetic head 4 Since the magnetic head passes through the scratch 8, the magnetic head scratch time 13 is longer.

Therefore, the position of the optical head 5 in the tangential direction is adjusted by moving the irradiation position of the light spot 6 in a direction in which both scratch times coincide with each other.

In the above embodiment, the physical signal is used for both the magnetic head and the optical head as information for causing some change locally in the reproduced signal from the relative position adjustment disk 1. Alternatively, the following information may be used.

For the magnetic head, if the scratch location is in the no-signal area, the change in the amplitude of the reproduced signal becomes more remarkable, and the detection becomes easier. A similar effect can be expected by recording signals having extremely different frequencies and passing the signals through a filter during reproduction. For the optical head, a paint or the like whose light reflectance is extremely different from the surface of the magnetic recording medium may be used.

[0026]

As described above, according to the present invention, the relative position between the medium irradiation position of the optical head and the magnetic head can be easily adjusted with high precision.

[Brief description of the drawings]

FIG. 1A is a plan view of a disk for adjusting a relative position between a magnetic head and an optical head according to an embodiment of the present invention. FIG. 1B is an enlarged view of a main part of the disk.

FIG. 2 is a waveform diagram of a reproduced signal from a magnetic head and an optical head in adjustment using the same disk.

FIG. 3 is a diagram illustrating the operation of a floppy disk device that performs servo control of a magnetic head using an optical head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic (relative position adjustment) disk 2 Magnetic signal 3 Stitch 4 Magnetic head 5 Optical head 6 Optical spot 7 Magnetic head block 8, 9 Scratch 10 Motor index signal 11 Reproduction signal waveform diagram from magnetic head 12 Reproduction signal from optical head Waveform diagram 13 Magnetic head scratch time 14 Optical head scratch time

Claims (2)

[Claims] 1. A disk device which performs servo control by following an optical track with an optical head so that a magnetic signal can be read and written by a magnetic head on a magnetic track paired with the optical track. A disk used for adjusting a relative position of a light spot irradiated from an optical head with respect to a magnetic head, wherein a magnetic signal recorded in advance has a local portion on a magnetic track where a reproduction signal of the magnetic head is Information on the optical track, and information on a local change in the reproduction signal of the optical head, the relative position between the magnetic head to be adjusted and the light spot irradiated by the optical head. A relative position adjustment disk for a magnetic head and an optical head, wherein the relative position adjustment disk is formed to have the same relationship. 2. A disk drive that performs servo control by following an optical track by an optical head so that a magnetic signal can be read and written by a magnetic head on a magnetic track paired with the optical track. A method for adjusting a relative position of a light spot irradiated from an optical head with respect to a magnetic head, wherein a magnetic signal on which a magnetic signal is recorded in advance is locally applied to a reproduction signal of the magnetic head. The information that gives a significant change is the information on the optical track that gives the local change in the reproduction signal of the optical head, and the relative positional relationship between the magnetic head to be adjusted and the light spot irradiated by the optical head. First, the magnetic head is on-tracked on the magnetic signal using a disk formed in the same manner as above, and then the position of the optical head is adjusted so that the light spot is on-tracked. Thus, the step of adjusting the relative position of the optical spot in the radial direction of the disk, and detecting the pulse generated according to the rotation of the motor driving the disk, the magnetic head and the optical head are positioned on the respective tracks. Adjusting the relative position of the light spot in the tangential direction of the disc by detecting the time until the formed information is detected and adjusting the position of the optical head so that the two times coincide. A relative position adjustment method characterized by the above-mentioned.