JP2002237157A - Optical recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording and reproducing device capable of preventing a floating type slider from colliding with a recording medium when the device is shocked externally. SOLUTION: The optical recording and reproducing device 100 comprises a floating type slider 1, a shock detector 4, and a floating deciding circuit 5. When the device is shocked externally, the shock detector 4 sends a shock signal to the floating deciding circuit 5 according to the degree of the received shock. The floating deciding circuit 5 decides the degree of the shock from the shock signal, and when the shock exceeds a prescribed value, the circuit 5 sends a vertical direction refuge control order to a slider support driving part 3. The slider support driving part 3 moves the floating type slider 1 to go away from the recording medium 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus for recording / reproducing information by irradiating a recording medium with a laser beam, and more particularly, to an optical recording / reproducing apparatus having a flying type slider which floats on the recording medium. Optical recording and reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, the information society has advanced, and the recording density of an external storage device for storing enormous information has been remarkably improved. In particular, an optical recording / reproducing apparatus for recording / reproducing information by irradiating a recording medium with laser light has been widely used as a high-density external storage device. Optical recording / reproducing devices include an optical disk recording / reproducing device using a phase change material or an organic dye for a recording layer, and a magneto-optical disk recording / reproducing device.

As a technique for increasing the density of the optical recording / reproducing apparatus, the wavelength of the light source used has been shortened, and the density of the objective lens has been increased by increasing the numerical aperture (NA). As the NA of the objective lens increases, the distance between the objective lens and the recording medium decreases, and a technique for avoiding collision between the objective lens and the recording medium when an external impact is applied has become important.

[0004] Such a technique is disclosed in Japanese Patent Laid-Open No. 11-18 / 1999.
No. 5363 discloses that even when a special operation is performed while cutting a servo loop, even if an external impact is applied, the optical head is prevented from colliding with the optical disk and data is recorded / reproduced immediately. Optical disc device capable of
A drive control method of an objective lens and a control method of an optical head are disclosed. According to the technique disclosed in Japanese Patent Application Laid-Open No. H11-185363, an operation is performed to prevent the objective lens from colliding with the optical disc in accordance with the external impact strength detected by the impact detector when the focus servo is pulled in.
Even if focus servo pull-in fails due to an external impact, collision can be prevented.

Meanwhile, in the optical recording / reproducing apparatus, in recent years, an optical recording / reproducing apparatus provided with a flying slider has attracted attention. In an optical recording / reproducing apparatus having a flying slider, information is recorded / reproduced by flying the flying slider using an air flow when a recording medium rotates. Generally, at least one of a magnetic head and an optical lens is mounted on a flying slider. For example, in a configuration in which only a magnetic head is mounted on a flying slider, the frequency of an external magnetic field applied to a recording medium by the magnetic head can be increased, and an optical recording / reproducing apparatus capable of high-speed magneto-optical recording is provided. Provided. Also, an optical recording / reproducing apparatus in which an optical lens is mounted on a flying slider has been proposed, and attention has been paid to a technique relating to an optical recording / reproducing apparatus having a flying slider.

As a technique utilizing such a flying type slider for optical recording and reproduction, Japanese Patent Laid-Open No. 11-213419 discloses an optical recording system capable of high-density recording and reproduction using a slider type head equipped with a solid immersion lens. An optical head and an optical recording / reproducing device that perform tracking operation control of the reproducing device with high accuracy are disclosed. JP-A-11-213
According to Japanese Patent No. 419, a slider placed on the upper recording surface of a magneto-optical disk rotated by a spindle motor and floated from this surface by an air bearing is provided with a solid immersion lens at a position close to the upper recording surface of the disk. Is disposed, and an objective lens for condensing recording / reproducing light on a solid immersion lens is disposed on the upper side of the optical head to form an optical head.
This optical head is held by a head arm via a fine movement actuator, and performs high-accuracy tracking control by control by a fine movement actuator in addition to rotation control of the head arm by a voice coil motor. As another example, Japanese Patent Application Laid-Open No. 2000-21041 discloses a flying magnetic head device and a signal reproducing method and a recording / reproducing method using the same. JP 2000-2104A
In Japanese Patent Application Publication No. 1 (1993) -1989, a flying magnetic head device is used in which an optical system having a numerical aperture NA of 1 or more is arranged on a flying slider, and a magneto-optical film having a magneto-optical effect is formed at a focal position thereof. When reproducing the information signal of the magnetic disk on which the perpendicular magnetization film is formed, the information signal is transferred to the magneto-optical film of the floating magnetic head device,
This is read by an optical system having a numerical aperture NA of 1 or more.

[0007]

However, in the above-mentioned prior art, in an optical recording / reproducing apparatus provided with a flying slider, it is possible to safely prevent a collision between the flying slider and a recording medium when an external impact is applied. No evasion measures have been adopted. The technique disclosed in Japanese Patent Application Laid-Open No. H11-185363 is effective when the distance between the objective lens and the optical disk is small, but does not take into account the characteristics inherent to the optical recording / reproducing apparatus having the flying slider. There is no description about the flying slider. In addition, the above-mentioned Japanese Patent Application Laid-Open
1-213419 and JP-A-2000-21041
In the publication, no measure is taken to cause the flying slider to collide with the recording medium when an external impact is applied.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an optical recording / reproducing apparatus capable of preventing a flying slider and a recording medium from colliding with each other when an external impact is applied. It is to provide a device.

[0009]

According to the present invention, in an optical recording / reproducing apparatus for a recording medium, a flying slider flying above the recording medium, a slider support for supporting the flying slider, and the recording medium. A light source for irradiating the medium with laser light, an impact detector for detecting an external impact, and determining whether to float the flying slider based on the impact detected by the impact detector And a floating determination circuit for determining whether the floating slider moves away from the floating position on the recording medium when the floating determination circuit determines that the floating slider is not to fly. An optical recording / reproducing apparatus is provided.

[0010] The optical recording / reproducing apparatus of the present invention comprises at least:
A flying type slider that floats on a recording medium, a slider support unit that supports the flying type slider, and a slider support control unit that controls the operation of the support unit, record information by irradiating the recording medium with laser light. An optical recording / reproducing apparatus for performing reproduction, comprising an impact detector for detecting an externally applied impact, and a flying determination circuit for determining whether or not to float the flying slider. When the flying determination circuit determines that the flying slider is not to fly based on the detected impact, the flying slider can be retracted so as to separate the flying slider from the recording medium. In this case, the flying determination circuit can determine that the flying slider is not to fly above the recording medium when the impact detected by the impact detector is greater than a predetermined threshold. If the flying determination circuit determines that the flying slider will not fly, a flying stop signal is input to the slider support control unit to separate the flying slider support from the recording medium and retract the flying slider. It is preferable to use a configuration in which the above is performed. In addition, it is particularly preferable to include a floating slider retracting position fixing device for fixing the floating slider support portion when the floating slider is retracted. The optical recording / reproducing apparatus of the present invention can reproduce information from a recording medium using a magneto-optical effect (Kerr effect or Faraday effect).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the optical recording / reproducing apparatus according to the present invention will be specifically described below with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 shows a configuration diagram of an optical recording / reproducing apparatus according to the present invention. An optical recording / reproducing apparatus 100 according to the present invention includes a flying slider 1 that floats on a recording medium 10, a slider support 2 that supports the flying slider 1, and a slider support drive that controls the operation of the slider support 2. (Slider support control unit) 3, an impact detector 4 for detecting an impact, a flying determination circuit 5 for determining whether to float the flying slider, and a rotary drive system 20 for rotating the recording medium 10 And an optical system 30 and a signal processing system 40 for performing recording and reproduction by irradiating the recording medium 10 with laser light. The rotation drive system 20 includes a spindle and a spindle motor for driving the recording medium 10 to rotate, and a spindle motor control circuit for controlling the rotation of the spindle motor. As shown in FIG. 3, the optical system 30 includes a laser light source 31, a collimator lens 32, a prism 33, a signal detector 34, a beam splitter 35, a mirror 36, and an optical lens 37. In this embodiment,
A part of the optical system 30 also exists in the flying slider 1 and the slider support 2. Specifically, as shown in FIG. 2, the optical lenses 37a and 37b of the optical system 30 are mounted on the flying slider 1, and the mirror 36 is mounted on the slider support 2.

The recording medium 10 is provided on a plastic substrate.
It has a structure in which a dielectric layer, a thermal diffusion control layer, a dielectric layer, a recording layer, and a dielectric layer are sequentially laminated, and a so-called film surface incident recording in which laser light is incident from the side where the recording layer is formed. Medium. AlTi is used as the thermal diffusion control layer, SiN is used as the dielectric layer, and TbFeCo is used as the recording layer.
And laminated by a sputtering method. Recording medium 1
On the substrate of No. 0, track pit signals indicating the track position of the recording area of the recording layer are formed in a wobble arrangement by a sample servo method. The recording medium 10 is mounted on a spindle of a rotary drive system 20 of the optical recording / reproducing apparatus.

As shown in FIG. 2, the flying type slider 1 has optical lenses 37a and 37b and a magnetic coil 38 mounted thereon. The optical lens 37b may be a solid immersion lens. The slider supporting portion 2 corresponds to the floating function of the floating type slider 1 and
Maintain a stable position. The slider support 2 has a form in which a suspension is mounted on a swing arm-shaped support centered on a rotation axis, and a mirror 36 is mounted inside the support.

In FIG. 3, a beam from a laser light source 31 passes through an optical path chamber and travels to a flying slider 1 by a beam splitter 35 mounted on a rotating shaft.
The reflected light after being accessed by the recording medium 10 is received by a detector of an optical system fixed to the swing arm. The arm on which the optical system is arranged on the swing arm and the part of the arm on which the optical system is arranged are configured so that the weights are balanced about the rotation axis. At the time of recording / reproduction, the operation of the slider support 2 is controlled by the slider support controller 3 to access a desired address. For such access, focusing and tracking are performed using an actuator mechanism (not shown).

The impact detector 4 can generate an impact signal corresponding to an applied impact by using detection using a conductive resin or detection using a mechanical mechanism such as a spring. An AE (Acoustic Emission) sensor may be used as the shock detector 4.

When the amplitude of the shock signal generated by the shock detector 4 is larger than a predetermined threshold, the flying determination circuit 5 determines that the flying slider will not fly above the recording medium. When the flying determination circuit 5 determines that the flying is not performed in this way, the flying stop signal 60 is input to the slider support control unit 3, and forced processing completely different from the access at the time of recording / reproduction is performed. That is, the flying type slider 1 is retracted by separating the slider support 2 from the recording medium 10. FIG. 6 shows a control flow of the evacuation operation. As shown in FIG. 6, when the shock detector 4 is operated and an external shock is detected, a vertical retreat control command is sent to the slider support drive unit 3 to record the flying type slider 1 on the recording medium 10. It moves in a direction away from the medium 10. At this time, the spindle motor 22 is kept rotating. This is because if the rotation of the spindle motor 22 is suddenly stopped, the flying stability of the flying type slider 1 cannot be secured, and the flying type slider 1 may come into contact with the recording medium 10. Next, a horizontal retreat control command is sent to the slider support drive unit 3 to move the slider support unit 2 in the horizontal direction and retreat to the retraction unit. Thereafter, a vertical retreat control command is sent to the slider support drive unit 3 to retreat the flying slider 1 to the retreat unit 80.

After the floating slider 1 has been retracted in this way, the floating slider support 2 is fixed by the floating slider retracting position fixture 70. Thereby, when the floating slider 1 is retracted to the retreat portion 80 upon detecting an impact, it is possible to prevent the floating slider 1 from being largely displaced from the retreat portion 80 due to a strong external impact. it can. As the floating slider retracting position fixing tool 70, an arm that sandwiches the floating slider support 2 as shown in FIG. 9 was used. The floating slider retracting position fixing device 70 can be buried in the lower part when no impact is applied.

The recording medium loaded in the optical recording / reproducing apparatus may be housed in a cartridge having a shutter mechanism, for example. At the time of recording / reproducing, as shown in FIGS. 7A and 8A, the flying type slider 1 accesses the recording medium 10 from the opening 93 of the cartridge 91, and floats on the recording medium 10 to transfer information. When recording and reproducing data and retreating by detecting an external impact, FIG.
As shown in FIG. 8B and FIG.
Retreats to the retreat unit 80.

In the above embodiment, when a predetermined shock signal is detected, the flying slider 1 is retracted in the vertical direction and then moved horizontally to be retracted to the retracting section 80. Up and down in the vertical direction,
The recording or reproducing operation may be resumed by lowering again after the impact signal falls below the threshold value.

[0021]

According to the optical recording / reproducing apparatus of the present invention, when a shock is applied from the outside, the flying determination circuit determines whether or not the flying slider is caused to float on the recording medium in response to the shock detected by the shock detector. If it is determined that the flying slider is not to fly, the slider support control unit is controlled to move the flying slider away from the recording medium and retract. Therefore, collision between the flying slider and the recording medium can be avoided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram schematically showing a configuration of a flying slider and a slider support in the optical recording / reproducing apparatus of the present invention.

FIG. 3 is a configuration diagram showing an optical system in the optical recording / reproducing apparatus of the present invention.

FIG. 4 is a perspective view showing a state before and after retracting a flying slider in the optical recording / reproducing apparatus of the present invention.

FIG. 5 is a plan view showing a state before and after retracting a flying slider in the optical recording / reproducing apparatus of the present invention.

FIG. 6 is a flowchart showing a control flow for retracting a flying slider in the optical recording / reproducing apparatus of the present invention.

FIG. 7 is a schematic perspective view of a floating slider retracting position fixing device for fixing the retracted floating slider in the optical recording / reproducing apparatus of the present invention.

FIG. 8 is a plan view showing states before and after retracting a flying slider when a recording medium is housed in a cartridge having a shutter mechanism in the optical recording / reproducing apparatus of the present invention.

FIG. 9 is a perspective view of a floating slider retracting position fixing device for fixing the retracted floating slider in the optical recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flying type slider 2 Slider support part 3 Slider support drive part 4 Shock detector 5 Flying determination circuit 20 Rotation drive system 30 Optical system 40 Signal processing system

Claims (5)

[Claims] 1. An optical recording / reproducing apparatus for a recording medium, comprising: a flying slider flying above the recording medium; a slider support for supporting the flying slider; and a light source for irradiating the recording medium with laser light. An impact detector for detecting an external impact, and a flying determination circuit for determining whether to float the flying slider based on the impact detected by the impact detector, The optical recording / reproducing apparatus, wherein when the flying determination circuit determines that the flying slider is not to fly, the slider support unit moves the flying slider away from a flying position on the recording medium. 2. An impact detected by the impact detector,
2. The optical recording / reproducing apparatus according to claim 1, wherein when the value is larger than a predetermined value, the flying determination circuit determines that the flying slider is not to fly. 3. The optical recording apparatus according to claim 1, further comprising a floating slider retracting position fixing device for fixing the floating slider supporting portion when the floating slider is retracted. Playback device. And a slider support control section for controlling an operation of the slider support section, wherein the flying determination circuit comprises:
If it is determined that the flying slider is not to fly, a flying stop signal is output to the slider support control unit, and the slider support control unit, to which the flying stop signal has been input, retreats the flying slider from the recording medium. The optical recording / reproducing apparatus according to any one of claims 1 to 3, wherein the flying type slider support is controlled so as to perform the operation. 5. The optical recording / reproducing apparatus according to claim 1, further comprising an optical lens and a magnetic coil provided on the slider, and reproducing information using a magneto-optical effect. apparatus.