KR20030072923A - Optical recording and reading apparatus of Near Field for straight line drive - Google Patents

Abstract

PURPOSE: A near field optical recording/reproducing device for recti-linear rotation is provided to realize the rectilinear rotation in the tracking direction for carrying out the recording and reproducing of a disc. CONSTITUTION: First and second supporting parts(202,212) are formed symmetrically to each other for integrally supporting a pickup head(201) having an optical lens. First and second rotation shafts(205,215) are in parallel to each other and supporting the rotation of the first and second supporting and guide parts in a recti-linear rotation range. Magnetic circuits are formed of coils(204,214) and magnets(206,216) for rotating the first and second guiding parts along the first and second rotation shafts.

Description

Optical recording and reading apparatus of Near Field for straight line drive

The present invention relates to a near field optical recording and reproducing apparatus, and more particularly, to a near field for linear rotation in which one or more pickup heads are configured for the pit weight shot of the near field head, and the movable part of the pickup head can be linearly rotated. An optical recording and reproducing apparatus.

An optical disc or a magneto-optical disc must have a small bit (or recording mark) size and a narrow track width to have a high density recording capacity. However, since the spot size of the light condensed on the disk to form a bit in the recording film of the disk is limited by the diffraction limit, there is a limit in improving the recording density.

In light of the trend of large-capacity information, new optical recording / reproducing methods are required to overcome the limitations of existing optical recording / reproducing methods. In recent years, research on near field recording / reproduction using near field, which is expected to significantly improve recording capacity, has been increasing.

The principle of near field optical recording and reproduction is as follows. Light entering the lens at an angle greater than or equal to the critical angle is totally reflected when traveling from a dense refractive index to a small one. At this time, due to total reflection of light, very small intensity of light exists on the surface of the lens. This is called an evanescent wave or dissipation wave. Using this evernet wave, it is possible to achieve high resolution, which is impossible because of the diffraction limit, which is an absolute limit of resolution due to diffraction of light in the far-field. The near field optical recording and reproducing optical system totally reflects the light in the lens to generate an Evernet wave on the surface of the lens, and records and plays back by coupling the Evernet wave to a disk.

1 shows the structure of a conventional near field optical recording and reproducing apparatus.

Referring to FIG. 1, a suspension arm 102 and a coil support 103 are integrally formed, and are supported by an actuator arm 101 rotatably supported by a pivot shaft 104 mounted on a base (not shown). ), A flat coil 105 constituting a voice coil motor on a coil support 103 positioned opposite to the slider with respect to the pivot shaft 104, a lower stator magnet holding plate 106 fixed to a base, and A stator magnet 107 positioned below the plate coil 105 and a slider installed at the tip of the suspension portion 102 to scan a track of the disc while being injured relative to the disc 110 by pneumatic pressure ( 108).

A conventional near field optical recording and reproducing apparatus as described above will be described below with reference to the accompanying drawings.

Referring to FIG. 1, the actuator arm 101 is rotatably supported by a pivot shaft 104 in which a suspension portion 102 and a coil support portion 103 are integrally formed and plugged into a base. Drive in the direction of arrow 'J' or 'K'.

A slider 108 is held at the tip of the suspension portion 102, and the slider 109 scans the disc tracks by the objective lens and the opposing lens 109 for reading and recording.

When the actuator arm 101 is positioned on the recording surface of the rotating disk, the slider 109 is configured to fly over the recording surface of the disk so that the head faces the recording surface at a predetermined interval.

In the actuator arm 101, the slider 108 is held at the tip of the suspension portion 102 as described above, but the voice is provided in the coil support 103 positioned opposite to the slider 108 with respect to the rotational shaft 104. The flat coil 105 constituting the coil motor is wound.

The lower stator magnet holding plate 106 fixed to the base holds the stator magnet 107 below the plate coil 105. The voice coil motor is constituted by the stator magnet 107 and the flat plate coil 105, and the actuator 100 is constituted by the voice coil motor and the actuator arm 101.

Then, when a current flows in either direction in the plate coil 105, the plate coil 105 obtains a force in the rotational direction to the left side due to the electromagnetic action between the stator magnet 107 and the actuator arm 101. ) Get the rotational force clockwise. On the contrary, when current flows in the plate coil in a different direction, an electromagnetic action is generated between the plate coil and the stator magnet 107, and thus the actuator arm 101 is rotated in the counterclockwise direction because the force in the rotation direction is obtained to the right. Get

Then, the actuator arm 101 is installed on the slider 108 as the reciprocating rotational movement allows the track of the disk 110 to be scanned while being lifted against the disk 110 by pneumatic pressure.

As described above, the actuator of the conventional near field optical recording / reproducing apparatus simply supports only the tracking operation, and thus, there is a disadvantage in that the pit following due to the disk bending cannot be accessed more accurately.

The present invention solves the above problems, the near-field light for linear rotation to have a support structure symmetrically with respect to the pickup head for a linear movement in the tracking direction about two parallel pivot axis It is an object to provide a recording / playback apparatus.

Another feature is a structure in which one or more pickup heads are configured and symmetrically integrates or separates the corresponding support structure, so that a linear rotation can be performed by a magnetic circuit about a rotation axis within a range of rotation by a magnetic circuit. It is an object of the present invention to provide a near field optical recording and reproducing apparatus.

1 is a block diagram showing the structure of a conventional near field optical recording and reproducing apparatus.

Fig. 2 is a block diagram showing a near field optical recording and reproducing apparatus for linear rotation according to the first embodiment of the present invention.

3 is a block diagram showing a near field optical recording and reproducing apparatus for linear motion according to a second embodiment of the present invention;

4 is a block diagram showing a near field optical recording and reproducing apparatus for linear motion according to a third embodiment of the present invention.

5 is a block diagram showing a near field optical recording and reproducing apparatus for linear motion according to a fourth embodiment of the present invention.

** Explanation of symbols for main parts of drawings **

201,301,401,501,521 ... pickup head

202,212,303 ~ 306 ... 1st suspension

204,214,307,308,406,407,506,507,526,527 ... Rotary Shaft Guide

204,214,309,310,408,409,508,509,528,529 ... coil

205,215,311,313,404,405,504,505 ... Rotating shaft

206,216,312,314,412,413,512,513 ... magnet

210,320,420,520 ... disc

In order to achieve the object as described above, the near field optical recording and reproducing apparatus for linear rotation according to the present invention,

A pickup head comprising a pick-up head mounted with opposing lenses opposed to a surface of a recording medium, wherein the near field light recording contestant is configured to record or reproduce information by injecting near-field light into the recording medium.

First and second supports and guides symmetrical with each other supporting the pickup head and guiding rotation within a linear rotation range;

First and second pivot shafts horizontally supporting the rotation of the first and second supports and the guide portion within the linear rotation range;

And a magnetic circuit for rotating the first and second supports and guides along the first and second pivotal axes.

Preferably, the pickup head is constituted of a plurality, and the plurality of pickup heads are integrated into the first and second supporting and guide parts so as to rotate.

Preferably, the magnetic circuit includes a coil wound around the first and second support and guide parts and a magnet installed opposite to the coil and installed in a linear rotation range and inserted into the first and second rotation shafts. It features.

Preferably, the magnetic circuit includes a coil wound and movable in the first and second support and guide portions, respectively, a magnet opposing to the coil in parallel with each other and positioned in a linear rotational range, and vertically in the coil. And a fixed yoke corresponding to the magnet.

Preferably, it comprises a first pick-up and a second support and guide for constituting a plurality of pickup head, for supporting and operating each of the plurality of pickup head.

Hereinafter, with reference to the accompanying drawings as follows.

2 is a block diagram showing an optical recording and reproducing apparatus for linear rotation according to the first embodiment of the present invention.

Referring to FIG. 2, a single pick-up head 201, a first symmetrical first and second support part 202 and 203 supporting the pick-up head 201, and the first and second support parts 202 and 212 are integrated. 1st and 2nd rotation shaft guide parts 203 and 213 which guide linear rotation, and 1st and 2nd times parallel to each other which support the linear rotation of the said 1st and 2nd rotation shaft guide part within a linear rotation range. Coils 204 and 214 and magnets 206 and 216 as magnetic circuits for linearly rotating the first and second rotational shaft guide portions along the coaxial 205 and 215 and the first and second rotational shafts 205 and 215. to be.

In another embodiment, a plurality of pickup heads may be configured, and the support and guide portions of the pickup head may be integrated or separated to linearly rotate.

The near field optical recording and reproducing apparatus for linear rotation according to the embodiment of the present invention as described above will be described with reference to the accompanying drawings.

First embodiment;

2 is a block diagram showing a near field optical recording and reproducing apparatus having one pickup head for linear rotation according to the present invention.

Referring to FIG. 2, the pickup head 201, which maintains a predetermined focal length on the disk 210 and has an optical lens, is integrally supported by the left and right symmetrical first and second supports 202 and 212. The first and second support parts 202 and 212 are supported by the first and second pivot guide parts 203 and 213.

At this time, the first and second pivot shafts 203 and 213 linearly move along the first and second pivot shafts 205 and 215 which are horizontal to each other within the rotation range.

To this end, coils 204 and 214 are wound around the first and second rotational shaft guide parts 203 and 213, respectively, and magnets 206 and 216 vertically inward are formed inside the first and second rotational shafts opposite to the coils 204 and 214. Inserted.

Here, when the component for linear rotation of the pickup head 201 is a movable part, and the component which supports the movable part is a fixed part, the movable part is the 1st and 2nd support part 202,212, 1st and 2nd time. Coaxial guide portions 203 and 213 and coils 204 and 214, and fixing portions become first and second pivotal shafts 205 and 215 and magnets 206 and 216 therein. In an embodiment, the positions of the coil and the magnet among the components of the movable part and the fixing part may be interchanged.

Referring to the operation of the first embodiment, the movable parts comprising the coils 204 and 214 as components by the electromagnetic force generated by the magnets 206 and 216 according to the polarities of the currents applied to the coils 204 and 214 are formed. The linear movement is performed along the two rotation shafts 205 and 215 within the rotation range.

Therefore, the movable part and the fixing part of the pickup head 201 are symmetrical with each other, so that the pickup head 201 is supported by the left and right symmetrical supporting parts 202 and 212, and the magnetic body comprising the coils 204 and 214 and the magnets 206 and 216. After generating the total magnetic force by the circuit, the pick-up head 201 records or reproduces the disc 210 by rotating it linearly in the rotation range along the rotation shafts 205 and 215 by the electromagnetic force.

Second embodiment;

3 is a block diagram showing a near field optical recording and reproducing apparatus having two pickup heads for linear rotation according to the second embodiment of the present invention.

Referring to FIG. 3, a plurality of pickup heads 301 and 302 spaced apart from each other from the center of the disc 320, and the pair of first and second support portions 303, 304, 305 and 306 respectively integrate the pickup heads. And a pair of first and second support portions 303, 304 (305, 306) are integrated into the first and second pivotal shaft guide portions 307, 308.

In addition, vertically wound coils 309 and 310 are formed in the first and second rotational shaft guide parts 307 and 308, and the first and second rotational shafts 311 and 313 face each of the coils, and magnets 312 and 314 are formed therein. It is inserted and constitutes a magnetic circuit by the coils 309 and 310 and the magnets 312 and 314. Here, the first and second pivot shafts 311 and 313 are parallel to each other and are installed in the linear rotation section of the pickup heads 301 and 302.

That is, a pair of symmetrical first and second support portions 303, 304 (305, 306) and first and second pivot guide portions 307, 308 for supporting the plurality of pickup heads 301, 302 are formed, and the first And rotate the second rotation shaft guide parts 307 and 308 along the first and second rotation shafts 311 and 313 by the magnetic circuit. The movable portion here is a pair of first and second support portions 303, 304 (305, 306), rotational shaft guide portions 307, 308, and coils 309, 310.

In operation, according to the polarity of the current applied to the coils 309 and 310 of the magnetic circuit, the left / right rotational shaft guide parts 307 and 308 of the movable part are driven by the total magnetic force generated by the action of the magnets 312 and 314. Linearly rotates along the first and second pivotal shafts 311 and 313, thereby causing the pair of first and second support portions 303,304 and 305 and 306 integrated with the first and second pivotal shafts 311 and 313 to be linearly rotated. The plurality of pickup heads 301 and 302 are rotated linearly in the tracking direction.

In this third embodiment, a plurality of pickup heads are positioned on the left and right sides of the disc to support the pair of first and second support units integrally, and simultaneously follow both tracks of the disc in an injured state. This makes it possible to read disc data simultaneously in two pickup heads.

Third embodiment;

4 is a configuration diagram showing a near field optical recording and reproducing apparatus having one pickup head for linear motion as a third embodiment of the present invention, where (a) is a plan view and (b) is a side view.

Referring to FIG. 4, one pickup head 401, first and second support parts 402 and 403 integrally supporting the left and right sides of the pickup head 401, and the first and second support parts 402 and 403. The first and second rotational shaft guide portions 406 and 407 for guiding the linear movement of the < RTI ID = 0.0 >), < / RTI > the coils 408, 409, the magnets 412, 413, and the yokes 410, 411 is composed of a magnetic circuit.

In operation of this second embodiment, one pick-up head 401 is spaced at a predetermined focal length relative to the disc 420 to follow the disc track, and the first and second supports 402 and 403 are first and second. One pick-up head 401 is supported left / right integrally with each of the two rotational shaft guide portions 406 and 407, and the first and second rotational shaft guide portions 406 and 407 are the first and second rotational shafts 404 and 405. Is guided within the range of linear rotation.

Yokes 410 and 411 spaced outwardly of the first and second pivot shafts 404 and 405 and magnets 412 and 413 are formed outside the yokes 410 and 411, and coils 408 and 409 are formed around the outer sides of the yokes 410 and 411. The magnets 408 and 409 are wound to face each other to form a magnetic circuit.

Here, the first and second support parts 402 and 403, the first and second pivotal shaft guide parts 406 and 407, and the coils 408 and 409, which are symmetrical with respect to the pickup head 401, operate as movable parts, and the fixing part is first And second rotating shafts 404 and 405, yokes 410 and 411 and magnets 412 and 413. In an embodiment, the positions of the coil and the magnet may be changed.

Therefore, the movable part including the coils 408 and 409 by the electromagnetic force generated between the coils 408 and 409 and the magnets 410 and 411 according to the polarity of the current flowing through the coils 408 and 409 is applied to the first and second pivot shafts 404 and 405. Rotate linearly within the range of rotation. This causes the pickup head to record and play back the disc.

Fourth embodiment;

5 is a block diagram showing an optical recording and reproducing apparatus having two pickup heads for linear rotation according to the fourth embodiment of the present invention.

Referring to FIG. 5, a plurality of pickup heads 501 and 521 are positioned at left and right sides from a disk center, and a movable part for supporting and operating the pickup heads 501 and 521 is separated.

In detail, the first pick-up head 501 may include first and second support parts 502 and 503 symmetrically to the left and right sides, first and second pivot guide parts 506 and 507, and first and second coils. 508, 509, the first movable portion, and the second pick-up head 521, the third and fourth support portions 522, 523, the third and fourth pivot axis guides 526, 527, symmetrical to each other left and right; And a second movable portion consisting of three and fourth coils 528 and 529, wherein the fixing portion is fixed to the first and second pivotal shafts 504 and 505 and the first to fourth coils 508 and 509 around the first and second movable portions. 528 and 529 are respectively composed of wound left and right yokes 510 and 511 and magnets 512 and 513 facing the coil.

As a result of this operation, the first and second movable parts are rotated by a magnetic circuit composed of magnets 512 and 513 opposing the coils 508 and 509 and 528 and 529. It rotates in the linear rotation range along the coaxial 504,505.

In this case, the first movable part and the second movable part are formed by an electromagnetic force caused by an action between the coils 508, 509, 528, 529 and the magnets 512, 513 according to the polarity of the current applied to the first to fourth coils 508, 509, 528, 529. Rotates in the same direction with each other within the linear rotation range along the first and second rotation shafts 504 and 505. In addition, if the current direction and the size of the coil is changed, it is possible to rotate individually. Accordingly, the data of the disc can be read simultaneously using two pickup heads.

According to the near field optical recording and reproducing apparatus for linear rotation according to the present invention, not only the conventional hard disk drive and the near field optical system slide driving force are released from the swing arm method, but also linear rotation in the tracking direction is possible. By making the pickup head dual, it is possible to correct the double speed and error in the optical recording and reproducing apparatus, and to read data at the same time to increase the transmission speed.

Claims (5)

A pickup head comprising a pick-up head mounted with opposing lenses opposed to a surface of a recording medium, wherein the near field light recording contestant is configured to record or reproduce information by injecting near-field light into the recording medium. First and second supports and guides symmetrical with each other supporting the pickup head and guiding rotation within a linear rotation range; First and second pivot shafts horizontally supporting the rotation of the first and second supports and the guide portion within the linear rotation range; And a magnetic circuit for rotating the first and second supports and guides along the first and second pivotal axes. The method of claim 1, And a plurality of the pickup heads, wherein the plurality of pickup heads are integrally rotated by integrating the first and second support and guide parts. The method of claim 1, The magnetic circuit includes a coil wound around the first and second support and guide parts, and a magnet opposite to the coil and installed in a linear rotation range and inserted into the first and second rotation shafts. Near field optical recording and reproducing device for linear rotation. The method of claim 1, The magnetic circuit corresponds to a coil wound and movable respectively in the first and second support and guide portions, a magnet facing the coil in parallel with each other and vertical in a linear rotation range, and corresponding to the magnet in the coil. A near field optical recording and reproducing apparatus for linear rotation, comprising a fixed yoke. The method of claim 1, A near field optical recording and reproducing apparatus for linear rotation, comprising: a plurality of pickup heads; and first and second support and guide portions for supporting and operating each of the plurality of pickup heads.