JP2001084672A - Data recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the data capacity of a recording medium while reducing surface walling of the recording medium in rotation. SOLUTION: To hold the recording medium 9, holding members 11 are arranged at the outer peripheral part of the recording medium 9 at nearly equal intervals. Namely, the holding members 11 are so constituted as to hold the outer peripheral part of the recording medium 9 at four places, and the lower- end side is coupled with a rotary shaft 22. An elastic member 12 is provided at the part of each holding member 11 where the recording medium 9 is held and the recording medium 9 which is held by elastic members 12 is fixed. Then a motor 21 is driven to rotate the respective holding members 11 around an axis of rotation and the recording medium 9 also rotates. At this time, the outer peripheral part of the recording medium 9 is fixed by the holding members 11, so the surface deviation is suppressed. Further, data can be recorded at the center part of the recording medium 9 depending upon the outer peripheral part holding style.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus which rotates a recording medium in a predetermined direction while holding the recording medium and records or reproduces data on the recording medium with a predetermined light.

[0002]

2. Description of the Related Art Hitherto, there has been known an apparatus for recording and reproducing data by rotating a disk-shaped recording medium, in which the recording medium is rotated through a rotating shaft at the center of the recording medium.

FIGS. 13 and 14 show a drive mechanism of a recording medium in such a conventional data recording / reproducing apparatus 900. FIG. As shown in FIGS. 13 and 14, the recording medium 903 has an opening 903a formed in the center thereof, and the opening 903a is mounted on the rotating shaft 902. A motor 901 is provided at the lower end of the rotating shaft 902, and the recording medium 903 is configured to rotate in a predetermined direction about a rotating shaft 905 by the motor 901.

[0004]

In the conventional data recording / reproducing apparatus 900 as described above, only the central part of the recording medium 903 is held, and the outer peripheral part is not fixed. For this reason, as shown in FIG. 14, the outer peripheral portion of the recording medium 903 may move up and down while the recording medium 903 is being driven to rotate. Such blur of the outer peripheral portion is caused by the recording medium 903.
Becomes larger when a slight warp occurs due to a temperature change, an aging change, or the like.

In particular, in recent years, a technique for performing high-density data recording on a recording medium using near-field light has attracted attention. In order to record or play back data, the distance between the recording / reproducing head and the recording medium must be very close, about several tens of nm, but the recording surface may be irregular during rotation of the recording medium. If the camera shakes, the problem arises that appropriate recording or reproduction cannot be performed due to the camera shake. In addition, there is also a problem that the shake during rotation of the recording medium causes contact between the recording / reproducing head and the recording medium depending on the magnitude thereof, and destroys the recording / reproducing head and the recording medium.

Further, when the recording medium 903 is constituted by a mechanism for holding the center of the recording medium 903 as described above,
Since the data recording cannot be performed inside the vicinity of the opening 903a, there is also a problem that the mechanism for holding the central portion of the recording medium 903 restricts the data capacity of the recording medium 903.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has been made in consideration of the above circumstances, and has been made in view of the above circumstances. It is an object to provide a recording / reproducing device.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a recording medium is rotated in a predetermined direction while holding the recording medium, and data is recorded on the recording medium by a predetermined light. Or a data recording / reproducing apparatus for performing reproduction, comprising: holding means for holding an outer peripheral portion of the recording medium; and rotational drive for rotating the recording medium held by the holding means in a predetermined direction, the driving means being connected to the holding means. Means, and recording / reproducing means for recording or reproducing data by guiding the light to the recording medium held by the holding means.

According to a second aspect of the present invention, in the data recording / reproducing apparatus according to the first aspect, the holding means holds the entire outer circumference of the recording medium.

According to a third aspect of the present invention, in the data recording / reproducing apparatus according to the first or second aspect, the holding means is arranged so that a plane holding the recording medium at a portion for holding an outer peripheral portion of the recording medium. And a plane state detecting means for detecting the

According to a fourth aspect of the present invention, in the data recording / reproducing apparatus according to any one of the first to third aspects, the holding means further holds a non-recording surface of the recording medium. It is characterized by having holding means.

According to a fifth aspect of the present invention, in the data recording / reproducing apparatus according to any one of the first to fourth aspects, the recording / reproducing means includes near-field light generating means for generating near-field light. Data recording or reproduction is performed using the near-field light.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

<1. First Embodiment> First, a first embodiment will be described. FIG. 1 is a diagram showing an overall configuration of a data recording / reproducing apparatus 100 according to the first embodiment, and FIG. 2 is a perspective view of a recording medium holding portion in the first embodiment as viewed obliquely from above.

The data recording / reproducing apparatus 100 according to this embodiment has a holding means 1 for holding a disk-shaped recording medium 9.
0, a rotation drive means 20 for rotating the recording medium 9 about a rotation axis 23 perpendicular to the recording surface of the recording medium 9 and passing through the center position of the recording medium 9, and recording or reading on the recording medium 9 A movable arm 30 having a built-in optical recording / reproducing head for recording or reproducing data by guiding light for (reproducing) operation, and driving the movable arm 30 in the horizontal direction to drive the recording medium 9. The head horizontal drive unit 40 for moving the irradiation position of the light for recording or reproduction toward the center direction, and a control unit 50 for generally controlling these units are provided.

The holding means 10 is composed of four L-shaped holding members 11 so as to hold the outer periphery of the recording medium 9 at four points as shown in FIG. Each holding member 11 is arranged to hold the outer peripheral portion of the recording medium 9 at substantially equal intervals. An elastic member 12 such as rubber is provided on a portion of the holding member 11 for holding the recording medium 9.

FIG. 3 is a view showing the state of the recording medium 9 and the holding member 11 in a state where the recording medium 9 is held. FIG.
As shown in FIG. 2, the elastic member 12 is arranged so as to have a certain width in a direction perpendicular to the surface of the recording medium 9, so that even if the recording medium 9 has a slight warp or the like, the recording medium 9 has a small width.
Can be appropriately held. The position of the holding-side end face 11 a of each holding member 11 is designed to be located slightly inside the outer dimensions of the recording medium 9, so that the outer peripheral portion of the recording medium 9 in the holding state is attached to the elastic member 12. Accordingly, the outer peripheral portion of the recording medium 9 is fixed to the holding member 11.

Here, in order for the recording medium 9 to be exchangeable, the holding member 11 needs to be configured to be movable with respect to the outside of the recording medium 9. This is because unless the holding member 11 moves, the recording medium 9 cannot be removed and another recording medium 9 cannot be mounted. As described above, as a mechanism for moving the holding member 11 to the outside of the recording medium 9, a known drive mechanism can be applied.

For example, FIG. 4 is a view showing an example of a moving form of the holding member 11 for making the recording medium 9 replaceable.

In FIG. 4A, the holding member 11 is the first member 1
1b and a second member 11c.
1c is horizontally fixed, while the first member 11b is
It is configured to incline outwardly from a state of being erected vertically with respect to the member 11c. Therefore, the recording medium 9 can be replaced when the first member 11b is tilted.

In FIG. 4B, the holding member 11 is the recording medium 9
Is configured to move outward. Therefore, the recording medium 9 can be replaced when the holding member 11 has moved outward.

4A and 4B can be realized by applying a well-known driving mechanism such as a cylinder for moving the holding member 11. However, the holding state of the recording medium 9 can be realized. In this case, it is preferable to provide a lock mechanism or the like for fixing the position of the holding member 11 so that the holding member 11 does not move outward due to the pressing of the recording medium 9.

As described above, in this embodiment, the four holding members 11 are configured to hold the outer peripheral portion of the recording medium 9, and the outer peripheral portion 4 of the recording medium 9 is held in the holding state.
The elastic member 12 is moved so that the point does not move in the vertical direction.
And is fixed in a state where it is pressed.

Each holding member 11 is connected to a rotating shaft 22 that constitutes a rotary driving means 20.

The rotation driving means 20 is constituted by a motor 21 for performing rotation driving based on a driving signal from the control unit 50, and a rotation shaft 22 for performing a rotation operation about a rotation shaft 23 by the motor 21. .

As described above, each holding member 11 is connected to the rotating shaft 22 and the rotating shaft 23
Is configured to pass through the center position of the recording medium 9, so that when the motor 21 is driven by the control unit 50, the recording medium 9 rotates around its center while holding its outer peripheral portion. Will be. Since the outer peripheral portion of the recording medium 9 is fixed to the holding member 11, the outer peripheral end does not shake vertically during rotation.

The control unit 50 includes a head horizontal drive unit 4
0 to the movable arm 30
The light source provided in the movable arm 30 is driven, and a signal detected by a photodetector provided in the movable arm 30 is input.

Here, the recording / reproducing head provided in the movable arm 30 will be described. FIG. 5 is a diagram showing a configuration of the recording / reproducing head 60. As shown in FIG. 5, inside the movable arm 30, a light source 61, a collimator lens 62, a half mirror 63, a mirror 64, a near-field light generator 68, and a photodetector 6
5 is provided.

The light source 61 is a laser light source for emitting a laser beam of a predetermined wavelength, and it is preferable to use a semiconductor laser because the head configuration can be reduced. Light emitted from the light source 61 is converted into parallel light by the collimator lens 62 and guided to the half mirror 63. Then, the light transmitted through the half mirror 63 propagates inside the movable arm 30 and is guided to a mirror 64 provided inside the distal end of the movable arm 30. Then, the optical path direction is changed downward by the mirror 64, and the light is directed toward the recording surface 9 a of the recording medium 9. Further, an objective lens 66 and a solid immersion lens 67 constituting the near-field light generating means 68 as a probe in the recording / reproducing head 60 are provided. The objective lens 66 and the solid immersion lens 67 are sequentially fitted and provided in a through-hole 31 formed at the distal end of the movable arm 30.

The objective lens 66 is a lens having a function of condensing the light incident from the mirror 64, and the solid immersion lens 6
Reference numeral 7 is formed of a medium having a high refractive index. Then, the objective lens 66 forms a spot having a smaller diameter (spot smaller than the wavelength of the light from the light source 61) by condensing the light near the bottom surface of the solid immersion lens 67 as compared with the case where the objective lens 66 is concentrated in the air. . Normally, the light having a small diameter does not become the propagation light. However, by disposing the object close to the bottom surface of the solid immersion lens 67, the light having the small diameter becomes the near-field light 2 and is immersed on the object side. Come out. That is, the solid immersion lens 67 has a planar bottom surface located near the opening at the lower end of the through hole 31, and generates near-field light from the bottom surface by light incident from the spherical surface side.

The data recording / reproducing apparatus 10 of this embodiment
0, data recording was performed by forming minute recording pits 9c on the recording surface 9a of the recording medium 9 using such near-field light, or formed on the recording surface 9a of the recording medium 9. It is configured to read minute recording pits 9c.

When performing data reproduction, that is, reading, the near-field light 2 is applied to the recording surface 9 of the recording medium 9 as described above.
a, and the reflected light component of the near-field light 2 is detected by the photodetector 65.
This is performed by detecting at. The reflected light component of the near-field light 2 enters the photodetector 65 via the solid immersion lens 67, the objective lens 66, the mirror 64, and the half mirror 63. The photodetector 65 is configured by a photodiode or the like, and detects the amount of incident light. Since the light reflectance differs between the portion where the recording pit 9c is formed and the portion where the recording pit 9c is not formed on the recording surface 9a of the recording medium 9, the amount of the reflected light component of the near-field light 2 detected by the photodetector 65 is equal to the recording pit. 9c
And the non-formed portion have different values. Therefore,
The data recorded on the recording medium 9 can be appropriately reproduced.

As described above, in this embodiment, high-density data recording and reproduction are realized by minute spots using near-field light. The distance d between the bottom surface of the solid immersion lens 67 and the recording surface 9a of the recording medium 9 is close to several tens of nm so that data recording using near-field light can be appropriately performed. (That is,
(Near field).

The data recording / reproducing apparatus 1 having the above configuration
When data recording or reproduction is performed in 00, the control unit 90 supplies a drive signal to the head horizontal drive unit 40 and a drive signal to the motor 21. Thereby, the head horizontal drive unit 40 drives the movable arm 30 to position the recording / reproducing head 60 at a predetermined recording / reproducing start position, and the motor 21
Is rotated to rotate the recording medium 9 about the rotation axis 23 while holding the outer peripheral portion of the recording medium 9.

In the case of data recording, the control unit 90 supplies an electric light source driving signal corresponding to the data to be recorded to the laser light source 61. As a result, light having a recording wavelength corresponding to the data to be recorded is generated from the light source 61.
Then, the light emitted from the light source 61 is converted into near-field light 2 by the near-field light generating means 68 and the recording surface 9 of the recording medium 9 is recorded.
a, high-density data recording in a minute spot is performed. Then, the control unit 90 gives a drive signal to the head horizontal drive unit 40 as needed to move the movable arm 30 toward the center of the recording medium 9 as the data recording progresses. In this embodiment, since the outer peripheral portion of the recording medium 9 is held, data can be recorded on the entire recording surface 9a from the outer peripheral portion to the center of the recording medium 9. Therefore, the data capacity of the recording medium 9 can be increased as compared with the conventional configuration in which the central portion of the recording medium is held, and the entire surface of the recording medium 9 can be effectively used.

On the other hand, in the case of data reproduction, the control section 90 gives a predetermined electric light source drive signal to the laser light source 61.
As a result, light having a wavelength for reproduction is generated from the light source 61. Then, the light emitted from the light source 61 becomes the near-field light 2 by the near-field light generating means 68 and is guided to the recording surface 9a of the recording medium 9, and the data is read by the minute spot. Then, the control unit 90 gives a drive signal to the head horizontal drive unit 40 as needed to move the movable arm 30 toward the center of the recording medium 9 as the data reproduction progresses.

As described above, in the data recording / reproducing apparatus 100 of this embodiment, since the outer peripheral portion of the recording medium 9 is configured to be held and rotated, the outer peripheral portion of the recording medium 9 can be rotated even while the recording medium 9 is rotating. Can be fixed to the holding member 11. Accordingly, it is possible to suppress the outer peripheral portion from being vertically shaken during rotation. In particular, when performing data recording or data reproduction using near-field light as described above, the interval between the recording / reproducing head 60 and the recording surface 9a of the recording medium 9 must be maintained at several tens of nm. If the outer peripheral portion of the recording medium 9 shifts up and down, an error occurs in recording or reproduction without maintaining an appropriate interval. However, the outer peripheral portion of the recording medium 9 is held as in this embodiment. If the rotation causes the outer peripheral portion to be shaken, data recording or data reproduction using near-field light can be performed stably.

For example, when the rotation control of the recording medium 9 is a control for rotating the recording medium 9 at a constant linear velocity, the recording medium 9 itself depends on whether the data recording or reproducing position is near the center or the outer periphery of the recording medium. Because the rotation speed of
Although it is conceivable that the degree of surface shake due to rotation changes according to the rotation speed, holding the outer peripheral portion of the recording medium 9 suppresses surface shake itself as well as rotation as in this embodiment. Since it is possible to eliminate the change in the state of surface shake when the speed changes, stable data recording or reproduction is possible.

Further, by holding and rotating the outer peripheral portion of the recording medium 9, data can also be recorded in the central portion of the recording medium 9, so that the recording capacity of the recording medium 9 can be increased.

In this embodiment, the holding member 11
Has been described, and the outer peripheral portion of the recording medium 9 is held at four points. However, the present invention is not limited to this. The above may be held. If the recording medium 9 can be fixed, it may be held at two points. However, from the viewpoint of suppressing the vertical movement of the outer peripheral portion during rotation of the recording medium 9, it is preferable to increase the number of the holding members 11 and fix the outer peripheral portion at as many points as possible.

<2. Second Preferred Embodiment> Next, a second preferred embodiment of the present invention will be described. In this embodiment, a configuration example in which the multipoint holding mode by the holding member 11 of the first embodiment is more preferable will be described.

FIG. 6 is a perspective view of a recording medium holding portion according to the second embodiment as viewed obliquely from above. In FIG. 6, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The data recording / reproducing apparatus 10 of this embodiment
In Oa, a cylindrical holding member 13 is provided as holding means 10 for holding the outer peripheral portion of the recording medium 9.
An elastic member 14 such as rubber is disposed on the entire inner surface of the cylindrical holding member 13 as in the first embodiment. The inner diameter of the cylindrical holding member 13 is set to be slightly smaller than the outer diameter of the recording medium 9 as in the first embodiment.
Of the recording medium 9 is fixed to the inner side of the cylindrical holding member 13. That is, in this embodiment, the entire outer peripheral portion (the entire periphery) of the recording medium 9 is held by the cylindrical holding member 13 in a fixed state.

The lower side of the cylindrical holding member 13
The cylindrical holding member 13 is connected to the rotating shaft 22 and is rotated by the motor 21.
3. Rotational motion about 3 is performed. As a result, the recording medium 9
Rotates in a predetermined direction around the rotation shaft 23 integrally with the cylindrical holding member 13.

In this embodiment, since the entire circumference of the outer peripheral portion of the recording medium 9 is held in a state of being fixed to the cylindrical holding member 13, there is a possibility that the outer peripheral portion may shake up and down during rotation. Some parts are absent. Therefore, even if the motor 21 rotates at any rotational speed or there is any change in the rotational speed, the outer peripheral portion of the recording medium 9 does not move vertically. For this reason, the data recording / reproducing apparatus 100a of this embodiment can always achieve stable data recording or data reproduction.

Also in this embodiment, since the outer periphery of the recording medium 9 is held and rotated, data can also be recorded at the center of the recording medium 9. 9 can have a large recording capacity.

In this embodiment, other components not shown are the same as those in the first embodiment.

<3. Third Embodiment> Next, a third embodiment will be described. In each of the above embodiments,
Since only the outer peripheral portion of the recording medium 9 is held, the recording medium may be bent by the action of a force from the holding member that holds the outer peripheral portion. When such bending occurs, it causes a decrease in the horizontality of the recording surface of the recording medium.

Therefore, in this embodiment, a description will be given of a configuration example for eliminating such bending of the recording medium and improving the horizontality of the recording surface.

FIG. 7 is a diagram showing the principle of improving the horizontality of the recording surface. FIG. 7A shows a holding form of the recording medium 9 in each of the above-described embodiments. Since the holding means 10 is configured to hold only the outer peripheral portion of the recording medium 9, the force from the holding means 10 can be reduced. The central portion of the recording medium 9 may be bent downward by the action. If the amount of bending is extremely small, no problem occurs in data recording using near-field light, but if the amount of bending exceeds a certain amount, there is a possibility that data recording or the like cannot be performed properly. Occurs.

Therefore, in this embodiment, FIG.
By configuring the holding means 10 to hold the recording medium 9 from the lower side (non-recording surface side) of the recording medium 9 as shown in FIG.

Hereinafter, a specific configuration example of the data recording / reproducing apparatus according to this embodiment will be described. FIG.
Is a data recording / reproducing apparatus 100 according to this embodiment.
It is a figure showing composition of b.

As shown in FIG. 8, the data recording / reproducing apparatus 100b of this embodiment comprises a holding means 10, a rotary driving means 20, and a movable arm 30 as in the first embodiment.
, A head horizontal drive unit 40 and a control unit 50.

The holding means 10 includes a holding member 11 similar to that of the first embodiment, and a non-recording surface holding means 15 for holding the non-recording surface (the lower surface side in FIG. 8) of the recording medium 9. . The non-recording surface holding means 15 includes a holding plate 16 having a horizontal surface capable of holding substantially the entire non-recording surface, a support member 17 for supporting a central portion of the back surface of the holding plate 16, and a support member 17 for recording. And a cylinder 18 that moves up and down in a direction perpendicular to the recording surface of the medium 9. The driving of the cylinder 18 is controlled by the control unit 50. Therefore, the holding plate 16 moves up and down in the vertical direction when the cylinder 18 is driven.

In the data recording / reproducing apparatus 100b, first, the holding plate 16 is set in a lowered state so as not to contact the non-recording surface of the recording medium 9, and in this state, the bending of the recording medium 9 and the like are caused to occur in the downward direction. To the recording medium 9
To hold. When the holding of the outer peripheral portion of the recording medium 9 by the holding member 11 is completed, the cylinder 18 is driven and the holding plate 16 is raised in order to eliminate the downward bending of the recording medium 9 and the like. The elevation of the holding plate 16
Up to a predetermined position such that the recording surface of the recording medium 9 is at a predetermined horizontal reference line position (a reference position of the recording surface where data recording or reproduction using near-field light can be most stably performed). Done. Specifically, since the thickness of the recording medium 9 is known, the position of the horizontal surface of the holding plate 16 that holds the non-recording surface of the recording medium 9 is lower than the horizontal reference line by the thickness. The holding plate 16 is raised as described above.

As a result, the bending of the recording medium 9 as shown in FIG. 7A is eliminated by the holding plate 16, and the level of the recording surface of the recording medium 9 can be improved. It becomes.

The other mechanism shown in FIG.
This is the same as that described in each of the above embodiments.

As described above, in the data recording / reproducing apparatus 100b according to the present embodiment, the outer peripheral portion of the recording medium 9 is held and rotated, and the non-recording surface of the recording medium 9 is held, thereby bending the recording medium 9. And the like, so that the outer peripheral portion can be prevented from moving in the vertical direction while the recording medium 9 is rotating, and
Since the recording surface has a high degree of horizontality, more stable data recording or data reproduction can be performed.

Also, in this embodiment, since the provision of the holding member 11 and the holding plate 16 on the recording surface side of the recording medium 9 does not affect the reduction of the recording area, the central portion of the recording medium 9 is not affected. Data can be recorded on the recording medium 9, and the recording capacity of the recording medium 9 can be increased.

In this embodiment, the holding means 10 for holding the outer circumference of the recording medium 9 is a cylindrical member for holding the entire circumference of the outer circumference of the recording medium 9 as shown in the second embodiment. Needless to say, the holding member 13 may be used.

<4. Fourth Preferred Embodiment> Next, a fourth preferred embodiment will be described. In each of the above embodiments,
When the recording medium 9 is deformed (for example, warped) due to a temperature change, an aging change, or the like, if the outer peripheral portion of the recording medium 9 is held as it is, the outer peripheral portion of the recording medium 9 is fixed in a deformed state. You. Therefore, the deformed portion of the recording surface of the recording medium 9 is not located on the predetermined horizontal reference line, and there is a possibility that appropriate data cannot be recorded or reproduced. In particular, when warpage or the like occurs on the non-recording surface side of the recording medium 9, the effect of the warpage may be eliminated by the non-recording surface holding means 15 shown in the fourth embodiment. The recording medium 9
In the case where it occurs on the recording surface side (that is, on the upper side), it cannot be solved even by the non-recording surface holding means.

Therefore, in this embodiment, the recording medium 9
The plane state of the surface (recording surface) is detected, and the recording / reproducing head is driven in the vertical direction according to the plane state, so that data can be recorded or reproduced properly even on a recording medium that is deformed such as a warp. An example of a configuration that can be performed will be described.

FIG. 9 is a diagram showing an overall configuration of a data recording / reproducing apparatus 100c according to the fourth embodiment.

The data recording / reproducing apparatus 100c in this embodiment is similar to the holding means 10 in the first embodiment.
A head raising / lowering drive unit 45 that moves the movable arm 30 in the vertical direction based on a command from the control unit 90, in addition to the rotary drive unit 20, the movable arm 30, the head horizontal drive unit 40, and the control unit 50. Be composed.

In this embodiment, the movable arm 30
Is configured to move in the vertical direction perpendicular to the recording surface of the recording medium 9, and the head raising / lowering drive unit 45 raises / lowers the movable arm 30 based on a drive signal from the control unit 90. A horizontal moving member 35 is connected to the head lifting / lowering driving unit 45, and the horizontal moving member 35 is driven in a horizontal direction by a head horizontal driving unit 40 to move the movable arm 30.
The recording / reproducing head 60 (see FIG. 5) provided therein can be moved toward the center of the recording medium 9.

In the data recording / reproducing apparatus 100c of this embodiment, the portion of the holding member 10 of the holding means 10 for holding the recording medium 9 functions as an elastic member and detects the planar state of the recording medium 9. A pressure-sensitive sensor array 19 functioning as a planar state detecting means for performing the operation is provided.

FIG. 10 is an enlarged view of the pressure-sensitive sensor array 19. As shown in FIG. 10, a pressure-sensitive sensor array 19 in which a plurality of pressure-sensitive sensors 19 a to 19 g are vertically arranged is provided inside the holding member 11. Each of the pressure sensors 19a to 19g is turned on when a pressure equal to or higher than a predetermined value is applied from the outside, and turned off when the pressure is lower than the predetermined pressure. Therefore, in the case of the example of FIG. 10, only the pressure sensor 19d is in the on state, and the other pressure sensors are in the off state.
The ON / OFF state of each of the pressure sensors 19a to 19g is given to the control unit 90, and the control unit 90 determines which pressure sensor is in the ON state when the recording medium 9 is held. , The vertical position of the outer peripheral portion of the recording medium 9 can be specified.

The control unit 90 controls each holding member 11.
When on / off signals are input from a plurality of pressure-sensitive sensor arrays 19 arranged inside the recording medium 9, vertical positions at a plurality of positions on the outer peripheral portion of the recording medium 9 can be specified. However, information obtained by the pressure-sensitive sensor array 19 is as follows.
The position of the outer peripheral portion of the recording medium 9 is fixed, and the vertical position of the recording surface cannot be specified for the central portion of the recording medium 9. For this reason, the control unit 90 performs data such as linear interpolation based on the position of the outer peripheral portion specified by one pressure-sensitive sensor array 19 and the position of the outer peripheral portion specified by the other pressure-sensitive sensor array 19. The vertical position of the recording surface at the center of the recording medium 9 is predicted by performing interpolation, averaging, and the like. As described above, the control unit 90 calculates the position information of the central portion from the position information of the outer peripheral portion of the recording medium 9 based on the information obtained from the plurality of pressure-sensitive sensor arrays 19, and the position information is held by the holding member 11. The vertical position of the entire recording surface of the recording medium 9 is specified.

When recording or reproducing data on or from the recording medium 9, the control section 90 drives the head lifting / lowering drive section 45 in accordance with the vertical position of the recording surface. As described above, the control unit 90 drives the head lifting / lowering drive unit 45 in accordance with the vertical position of the recording surface of the recording medium 9, so that the recording / reproducing head 60 provided in the movable arm 30 is provided.
Moves vertically in accordance with the position of the recording surface, and the distance between the recording surface and the light emission position (the bottom surface of the solid immersion lens 67 (see FIG. 5)) is always a predetermined distance (about several tens nm). ). As a result, even when the recording medium 9 is warped, stable data recording or reproduction can always be performed.

As described above, since the data recording / reproducing apparatus 100c of this embodiment is also configured to hold and rotate the outer peripheral portion of the recording medium 9, the outer peripheral portion of the recording medium 9 can be rotated even during the rotation of the recording medium 9. Can be fixed to the holding member 11. Accordingly, it is possible to suppress the outer peripheral portion from being vertically shaken during rotation.

Further, in this embodiment, the holding means 1
Since the pressure-sensitive sensor array 19 is disposed at a position of the holding member 11 at which the recording medium 9 is held at 0, the control unit 90 can specify the position of the outer peripheral portion of the holding portion of the recording medium 9. Then, as in this embodiment, the control unit 90 supplies a drive signal to the head lifting / lowering drive unit 45, so that stable recording or reproduction of data can be performed even on the warped recording medium 9. Will be possible.
However, the head lifting / lowering drive unit 45 is not particularly necessary, and the control unit 90 may simply perform error processing when the position of the outer peripheral portion of the recording medium 9 is abnormal.

In the configuration example of FIG. 9, a description has been given of a configuration example in which the head lifting / lowering drive unit 45 moves the movable arm 30 in the vertical direction. However, in order to record or reproduce data, the configuration shown in FIG. As described above, since the distance between the bottom surface of the solid immersion lens 67 and the recording surface 9a only needs to be a predetermined distance, only the near-field light generating means 68 composed of the objective lens 66 and the solid immersion lens 67 is moved up and down. It may be configured as follows. In this case, since the drive mechanism can be downsized, the overall device can be downsized.

In the above description, the data recording / reproducing apparatus 100 shown in the first embodiment has been described as a basic form, and a configuration example in which the plane state detecting means is further arranged has been described.
A pressure-sensitive sensor array, which also functions as a planar state detecting means, can be arranged on the entire inner peripheral side of the cylindrical holding member 13 (see FIG. 6) shown in the second embodiment. FIG.
FIG. 1 is a plan view showing such a pressure-sensitive sensor array 70. As shown in FIG. 11, the pressure-sensitive sensor array 70 has a structure in which seven pressure-sensitive sensors S11 to S7n are arranged in a matrix in a vertical direction (X direction) and n in a horizontal direction (Y direction). are doing. In the pressure sensor array 70, the pressure sensors S41 to S4n located at the center in the vertical direction are associated with each other as a horizontal reference line of the recording medium 9. Therefore, when there is no warp or the like in the recording medium 9,
The outer peripheral portion is located on each of the pressure-sensitive sensors S41 to S4n on the horizontal reference line. On the other hand, when the recording medium 9 has a warp or the like, the pressure-sensitive sensor that detects the outer peripheral portion of the recording medium 9 moves in the vertical direction according to the position where the warp or the like exists.

By sticking such a pressure-sensitive sensor array 70 on the entire inner peripheral side of the cylindrical holding member 13 shown in FIG. 6, the position can be specified at all positions on the outer peripheral portion of the recording medium 9. That is, it is possible to improve the accuracy in specifying the vertical position of the entire recording surface.

Next, the control unit 90 in this embodiment is described.
Will be described. FIG. 12 is a flowchart showing a processing sequence of the control unit 90 in this embodiment.

When the recording medium 9 is mounted on the holding means 10, the control unit 90 inputs an on / off signal of the pressure-sensitive sensor in contact with the recording medium 9, and controls the outer peripheral portion of the recording medium 9 at the holding portion. Is specified (step ST1). Then, the control unit 90 predicts the surface shape of the recording medium 9 by performing a predetermined calculation based on the position of the outer peripheral portion of the recording medium 9 in the holding part (step ST2). When the process of step ST2 is completed, the rotating operation of the recording medium 9 is started to execute the actual recording or reproduction of the data, and the recording / reproducing head 60 is horizontally moved to a predetermined recording start position or reproduction start position.

Then, the control unit 90 determines whether or not the recording surface of the recording medium at the data recording position or data reproducing position is located on the horizontal reference line (step ST3).
If "ES", the process proceeds to step ST7 to perform data recording or reproduction, and if "NO", the process proceeds to step ST4 to determine whether the recording surface is located above the horizontal reference line.

If "YES" is determined in the step ST4, it is necessary to move the recording / reproducing head 60 in the upward direction in order to record or reproduce the data normally. The recording / reproducing head 60 is raised by driving the head lifting / lowering drive unit 45 according to the amount of displacement between the surface and the horizontal reference line.

On the other hand, if "NO" is determined in the step ST4, the recording / reproducing head 60 needs to be moved downward in order to record or reproduce data normally, so that the process proceeds to the step ST6. Then, the head lift drive unit 45 is driven in accordance with the amount of deviation between the recording surface and the horizontal reference line, and the recording / reproducing head 60 is lowered.

After the distance between the recording / reproducing head 60 and the recording surface is corrected so as to be in an appropriate state, data recording or reproduction is performed in step ST7. Then, the above-described routine of steps ST3 to ST7 is repeated until the end of data (step ST8).

The data recording / reproducing apparatus 10 of this embodiment
At 0c, the position of the outer peripheral portion of the recording medium 9 is detected as described above, and the planar state of the recording medium 9 is specified. Therefore, if the recording / reproducing head 60 is moved up and down according to the planar state of the recording medium 9, stable data recording or reproduction can be performed even when the surface of the recording medium 9 is deformed. You can.

In particular, when performing data recording or data reproduction using near-field light, the distance between the recording / reproducing head 60 and the recording surface of the recording medium 9 must be maintained in a very close state. By specifying the planar state of the recording medium 9 and driving the recording / reproducing head 60 according to the planar state as in this embodiment, the recording / reproducing head 6
0 and the recording surface of the recording medium 9 can always be controlled to be close to each other, so that the stability during data recording or reproduction can be improved.

<5. Modifications> Some embodiments of the data recording apparatus according to the present invention have been described above, but the present invention is not limited to the contents of the above embodiments.

For example, in each of the above embodiments, the case where the recording surface of the recording medium is held in the horizontal direction has been described. However, the present invention is not limited to this, and the recording medium is held in the vertical direction. Is also good. Further, in order to make the recording medium replaceable, the entire holding portion may have a structure that opens and closes in a double-opening manner. An inclined guide (a guide groove provided with a tapered inclination) at a portion where the recording medium is received by the holding section.
May be provided so that the recording medium can be smoothly set at a predetermined position.

[0085]

As described above, according to the first aspect of the present invention, the outer periphery of the recording medium is held by the holding means, and the recording medium is fixed by the rotary driving means while the outer periphery is held. Since data is recorded or reproduced by rotating in the direction, it is possible to reduce blurring of the outer peripheral portion of the rotating recording medium during data recording or reproduction. Further, since the outer peripheral portion of the recording medium is held, data can be recorded up to the central portion of the recording medium, and the data capacity of the recording medium can be increased.

According to the second aspect of the present invention, since the holding means holds the entire circumference of the outer peripheral portion of the recording medium, it is possible to eliminate blurring of the outer peripheral portion during rotation of the recording medium, and to achieve stable data. Recording or data reproduction can be performed.

According to the third aspect of the present invention, the portion for holding the outer peripheral portion of the recording medium is provided with the flat state detecting means for detecting the flat state of the recording medium. Can be determined whether the recording medium is warped or not.

According to the fourth aspect of the present invention, since the non-recording surface holding means for holding the non-recording surface of the recording medium is provided, the horizontality of the recording surface of the recording medium can be improved.

According to the fifth aspect of the present invention, the recording / reproducing means includes near-field light generating means for generating near-field light, and data is recorded or reproduced using such near-field light. With such a configuration, data can be recorded at a high density on a recording medium.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a data recording / reproducing apparatus according to a first embodiment.

FIG. 2 is a perspective view of a recording medium holding portion according to the first embodiment as viewed obliquely from above.

FIG. 3 is a diagram illustrating a state of a recording medium and a holding member.

FIG. 4 is a diagram illustrating an example of a moving form of a holding member for making a recording medium replaceable.

FIG. 5 is a diagram showing a configuration of a recording / reproducing head.

FIG. 6 is a perspective view of a recording medium holding portion according to a second embodiment as viewed obliquely from above.

FIG. 7 is a diagram illustrating a principle of improving the horizontality of a recording surface according to a third embodiment.

FIG. 8 is a diagram illustrating an overall configuration of a data recording / reproducing apparatus according to a third embodiment.

FIG. 9 is a diagram illustrating an overall configuration of a data recording / reproducing apparatus according to a fourth embodiment.

FIG. 10 is an enlarged view of a portion of a pressure-sensitive sensor array according to a fourth embodiment.

FIG. 11 is a plan view showing a pressure-sensitive sensor array arranged on the entire inner peripheral side of the cylindrical holding member.

FIG. 12 is a flowchart illustrating a processing sequence of a control unit according to the fourth embodiment.

FIG. 13 is a diagram showing a drive mechanism of a recording medium in a conventional data recording / reproducing apparatus.

FIG. 14 is a diagram showing a drive mechanism of a recording medium in a conventional data recording / reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 9 recording medium 9a recording surface 10 holding means 11 holding member 12, 14 elastic member 13 cylindrical holding member 19, 70 pressure-sensitive sensor array (flat state detecting means) 20 rotation driving means 30 movable arm 40 head horizontal driving section 45 head elevating / lowering Driving unit 60 Recording / reproducing head 68 Near-field light generating means

Claims (5)

[Claims] 1. A data recording / reproducing apparatus for rotating in a predetermined direction while holding a recording medium and recording or reproducing data on the recording medium by a predetermined light, wherein the data recording / reproducing apparatus holds an outer peripheral portion of the recording medium. Holding means; rotation driving means coupled to the holding means for rotating the recording medium held by the holding means in a predetermined direction; and guiding the light to the recording medium held by the holding means. And a recording / reproducing means for recording or reproducing data. 2. The data recording / reproducing apparatus according to claim 1, wherein said holding means holds the entire circumference of an outer peripheral portion of said recording medium. 3. The data recording / reproducing apparatus according to claim 1, wherein the holding unit detects a plane state of the recording medium at a portion holding an outer peripheral portion of the recording medium. A data recording / reproducing device comprising a detecting unit. 4. The data recording / reproducing apparatus according to claim 1, wherein the holding unit further includes a non-recording surface holding unit that holds a non-recording surface of the recording medium. Data recording and reproducing apparatus. 5. The data recording / reproducing apparatus according to claim 1, wherein said recording / reproducing means includes near-field light generating means for generating near-field light, and uses the near-field light. A data recording / reproducing apparatus, which records or reproduces data by using the data recording / reproducing apparatus.