KR20070118891A - Apparatus for data record and reproduction - Google Patents

Abstract

A data recording and reproducing device is provided to reproduce a large amount of data at high speed and to decrease a volume thereof. A data recording and reproducing device comprises a shaft(110,111), a base member(120), a holder(130), a reflection mirror(140), a magnetic circuit, and a motor. The base member is combined and moved with the shaft. The holder is rotatably connected to the base member and formed with a hole(132) at one side of the upper surface to pass a beam. The reflection mirror reflects a beam to the hole. The magnetic circuit rotates the holder. The motor moves the base member connected to the shaft by rotating the shaft. The base member is positioned on the path of a second beam separated by a predetermined beam splitter. The reflection mirror is positioned under the hole and inclined at a predetermined angle to reflect the second beam to the hole.

Description

Apparatus for Data record and reproduction

1 is a configuration diagram schematically showing a data recording and reproducing apparatus according to the present invention.

2 is a view for explaining that data is recorded on a recording medium in the data recording and reproducing apparatus according to the present invention.

3 is a diagram for explaining reproduction of data stored in a recording medium in the data recording and reproducing apparatus according to the present invention;

4 is a perspective view of an actuator according to the present invention;

5 is a perspective view of a movable member of the actuator according to the present invention.

6 and 7 illustrate a magnetic circuit for rotating the holder of the movable member according to the present invention.

8 is a diagram showing an interference pattern formed on a recording medium by the data recording apparatus according to the present invention.

The present invention relates to a data recording and reproducing apparatus.

Representative examples of recording media on which data is recorded include CD (Compact Disc) and DVD (Digital Versatile Disc). CDs and DVDs are recording media that store data using spots of light emitted from a laser light source.

CD or DVD uses a method of increasing the storage capacity by adjusting the pitch interval or increasing the recording layer, but due to physical limitations, it is no longer possible to increase the storage capacity.

Meanwhile, with the development of multimedia technology, there is a demand for a recording medium capable of storing more data, a data recording device capable of storing data on such a recording medium, and a data reproducing apparatus capable of reproducing the recording medium.

Accordingly, in recent years, research on data recording and reproducing apparatus using holograms has been actively conducted.

The data recording and reproducing apparatus using the hologram records and reproduces information in a storage medium using diffraction and interference effects of light, and is generally generated by interference between a signal beam and a reference beam. Use an interference fringe.

That is, when a signal beam and a reference beam are irradiated on a recording medium, an interference fringe is formed by the interference between the signal beam and the reference beam, and the interference fringe (i.e., hologram data) thus formed is stored. Recorded on the medium. When the reference beam is irradiated to the storage medium storing the interference fringe, the interference fringe stored in the storage medium is reproduced, and the recorded data is reproduced.

Here, since the incident position at which the reference beam is incident on the recording medium has to be changed, an actuator for adjusting the incident position of the reference beam is required.

However, as the size of the data recording and reproducing apparatus is reduced, a slim actuator which is simple in structure and occupies a small volume is required.

The present invention provides a slim actuator having a simple structure and occupying a small volume in a data reproducing apparatus capable of reproducing a large amount of data at high speed.

Hereinafter, exemplary embodiments of the inventive concept will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the appended embodiments, and those skilled in the art who understand the spirit of the present invention can easily add, change, delete, and add other embodiments included in the scope of the same idea. I would be able to suggest.

1 is a configuration diagram schematically showing a data recording and reproducing apparatus according to the present invention.

Referring to FIG. 1, a data recording or reproducing apparatus according to the present invention includes a shutter 20 for blocking or passing light generated from a light source 10, and a first light and a light incident from the shutter 20. Hologram data (that is, interference generated by the optical splitter 30 separating the two light, the path S1 of the first light, the path S2 of the second light, and the interference of the first light and the second light) Recording medium 40 is recorded.

In detail, the light source 10 may be a laser diode that emits light having a wavelength of 405 nm or 532 nm, and the light separator 30 transmits or reflects the incident light according to the polarization direction. A polarization beam splitter (PBS) for separating may be used.

Here, the first light is information containing information, and the second light is interference light for causing interference with the recording medium 40 or light for reproducing data stored in the recording medium 40.

In addition, the shutter 20 performs an on / off operation so that light emitted from the light source 10 may be intermittently passed. At this time, the progress of light may be controlled by controlling the light source 10 on / off without providing the shutter 20. Then, the data recording and reproducing apparatus according to the present invention can be stored or reproduced in units of pages during data recording and reproducing.

In addition, a spatial light modulator (SLM) 50 for loading input data to be recorded in the first light separated from the optical splitter 30 in the path S1 of the first light, and the spatial light Mirror 60 is included to change the traveling path so that the first light modulated by the modulator 50 is incident on the recording medium 40.

In detail, the spatial light modulator 50 may be formed of a liquid crystal on silicon (LCoS) panel. The spatial light modulator 50 may include input data, that is, data stored in units of pages, in the first light passing through the optical separator 30. Put it on.

In addition, the mirror 60 reflects the first light output from the spatial light modulator 50 to a predetermined position of the recording medium 40. Preferably, a predetermined actuator may be used to allow the mirror 60 to adjust the incident position of the first light.

Accordingly, the path S1 of the first light serves to provide the storage medium 40 with the first light required for recording the hologram data.

In addition, the path S2 of the second light includes an actuator 100 for changing the traveling position of the second light. In detail, the actuator 100 changes the incident position of the second light incident on the recording medium 40 by the second light separated by the optical separator 30.

Therefore, the path S2 of the second light serves to provide the recording medium 40 with a second light for recording or reproduction required for recording or reproducing hologram data.

In addition, the recording medium 40 is positioned on an optical path where the first light reflected from the mirror 60 and the second light incident from the actuator 100 cross each other, and the first light and the second light are intersected with each other. The interference fringe generated by the interference of light is recorded, and the interference fringe recorded by the irradiation of the second light is restored and output.

In addition, the data recording and reproducing apparatus according to the present invention includes an image sensor 70 for reproducing data recorded on the recording medium 40.

In detail, the image sensor 70 is located on the optical path of the interference fringe generated when the second light is incident on the recording medium 40, and restores the interference fringe recorded on the recording medium 40. When it is converted into the original electrical signal. In general, a complementary metal-oxide semiconductor (CMOS) sensor may be used as the image sensor 70.

Next, the operation of the data recording or reproducing apparatus according to the present invention configured as described above will be described.

First, the laser light generated by the light source 10 passes through the shutter 20 and is separated into a second light and a first light by the light separator 30.

In addition, the first light separated by the optical separator 30 is incident to the spatial light modulator 50, and the data to be recorded is recorded in units of pages and then reflected by the mirror 60 to be stored in the storage medium 40. Incident.

In addition, the second light separated by the optical separator 30 is changed to a predetermined position by the actuator 100 and is incident on the recording medium 40.

Then, the first light and the second light cause interference in the recording medium 40, and the interference fringes generated at this time are recorded on the recording medium 40.

After one page is recorded as described above, the second light is applied to the next page slightly different in position. That is, after the first page of data is recorded on the storage medium 40, when the laser light generated from the light source 10 is temporarily blocked by the shutter 20 and then passed again, the position of the second light is changed to be different. The data page is input and recorded in the storage medium 40.

In this case, the second light may be incident on the storage medium 40 at different positions by slightly forming different positions of incidence of the second light by the actuator 100 so as to correspond to each page. .

Therefore, by repeating the process of changing the position of the second light every time each page is recorded, hologram data can be superimposed on the recording medium 40, thereby enabling high capacity data recording.

In addition, in order to reproduce the data recorded on the recording medium 40, only the second light is incident on the recording medium 40. Here, the second light incident on the recording medium 40 at the time of reproduction should be incident at the same position as the second light incident on the recording, which can be adjusted by the actuator 100.

Therefore, when the second light is irradiated onto the recording medium 40 at the same position as the position of the second light at the time of recording, the interference fringe recorded on the recording medium 40 diffracts the second light so that Restored with a checkerboard consisting of contrast. And, if the read image is illuminated on the image sensor 70, the original recorded data can be reproduced.

2 is a view for explaining that data is recorded on a recording medium in the data recording and reproducing apparatus according to the present invention.

As described with reference to FIG. 1, the second light 45 incident from the actuator 100 and the first light 44 reflected from the mirror 60 are incident on the recording medium 40.

In detail, the recording medium 40 may be formed of a holographic recording medium having a glass cover 42 on both sides of the recording layer 41, and the holographic storage medium. The recording layer 41 of the medium may be formed of a photosensitive material such as a polymer.

Accordingly, the recording medium 40 has an interference pattern (43) formed by the first light 44 and the second light 45 is incident, and the interference pattern (43) by the interference pattern 43 Data included in the first light 44 is stored in the recording medium 40.

As described above, in the data recording apparatus according to the present invention, the light emitted from the light source 10 passes through the shutter 20 or the shutter 20 according to the on / off operation of the shutter 20. A first light is generated, which is blocked at, and includes data to be recorded by the spatial light modulator 50 which is operated in synchronization with the shutter 20.

In addition, the first light and the second light interfere with the recording medium 40 to form an interference pattern 43, thereby allowing data to be recorded on the recording medium 40.

3 is a diagram for explaining reproduction of data stored in a recording medium in the data recording and reproducing apparatus according to the present invention.

When the data stored in the recording medium 40 is reproduced, only the second light is used. The second light is generated and proceeds as described in FIG. 1, and the recording medium 40 is moved in the direction as shown in FIG. 2. ) Is incident.

In this case, the shutter 20 may be turned on / off to allow the second light to pass through, or the progress of the second light may be controlled by turning on / off the light source 10 without the shutter 20. have.

In addition, in order to block the first light from being incident on the recording medium 40, the spatial light modulator 50 is controlled or a shutter is provided on the path of the first light so that the first light is It is also possible to block the incident on the recording medium 40.

In order to reproduce data from the interference pattern 43 formed on the recording medium 40, the second light 45 is incident at the same position as the incident position when the interference pattern 43 is formed.

The second light 45 passing through the interference pattern 43 is incident on the image sensor 70. The image sensor 70 detects incident light as an electrical signal to reproduce data stored in the recording medium 40.

4 is a perspective view of an actuator according to the present invention.

Referring to FIG. 4, the actuator 100 of the data recording and reproducing apparatus according to the present invention includes a base member 120 which is coupled to the first shaft 110 and the second shaft 111 and slides, and the base member ( 120 includes a movable member 130 that is seated and fixed.

In detail, the base member 120 includes a first coupling part 121 and a second coupling part 122 coupled to and supported by the first shaft 110 and the second shaft 111. In addition, a screw thread is formed on the second shaft 111, and a screw bone engaging with the screw thread is formed on the second coupling part 122.

Then, when the second shaft 111 is rotated by the motor 112, the second coupling portion 122 is moved along the thread. The first shaft 110 guides the movement of the base member 120 while supporting the base member 120. In this case, the first shaft 110 and the first coupling portion 121 is configured to minimize the friction force.

Accordingly, the base member 120 may be slidably moved in the A-direction while being supported by the first shaft 110 and the second shaft 111.

On the contrary, a screw thread may be formed on the first shaft 110, and a screw bone may be formed on the first coupling part 121 to be engaged with the screw thread. In this case, the motor 112 is coupled to the first shaft 110.

In addition, the base member 120 is positioned on the path S2 of the second light, and the groove 123 is formed in the base member 120 to allow the second light to proceed. The movable member 130 includes a cylindrical holder 131 having a hole 132 formed on one side of an upper surface thereof, and a reflective mirror 140 formed below the hole 132.

In detail, the reflective mirror 140 is formed on a path of the second light passing through the groove 123 formed in the base member 120 so that the second light is reflected by the hole 132. It is formed to be inclined. Here, the hole 132 may be formed of a predetermined lens.

Therefore, a predetermined amount of the second light from the second light traveling through the groove 123 may be reflected by the reflective mirror 140 and may be incident to the recording medium 40 through the hole 132. Then, the second light is interfered with the first light by the recording medium 40, and the interference fringe is recorded on the recording medium 40.

5 is a perspective view of a movable member of the actuator according to the present invention.

Referring to FIG. 5, the movable member 130 of the actuator according to the present invention includes a cylindrical holder 131 having the hole 132 formed on one side of an upper surface thereof, and a magnetic circuit allowing the holder 131 to rotate. The support member 135 is fixed inside the base member 120 to support the holder 131, and a reflection mirror 140 positioned below the hole 132. The reflective mirror 140 may be formed under the holder 131 or be formed under the support member 135.

In detail, the shaft 133 is rotatably inserted into the center of the holder 131. The magnetic circuit includes a coil 134 attached to the outer circumferential surface of the holder 131 and a magnet 136 attached to the inner circumferential surface of the support member 135 to face the coil 134.

Then, the cylindrical holder 131 may be rotated in a clockwise or counterclockwise direction about the shaft 133 in the cylindrical support member 135 in a direction in which current flows in the coil 134.

In addition, the support member 135 is formed to surround the holder 131, and the surface positioned on the path of the second light is opened so that the second light can be transmitted to the reflective mirror 140. Preferably, the support member 135 may be formed with a predetermined yoke to increase the efficiency of the magnetic circuit.

7 and 8 illustrate a magnetic circuit for rotating the holder of the movable member according to the present invention.

Referring to FIGS. 7 and 8, the magnet 136 is a two-pole magnet in which the N pole and the S pole are formed left and right, and the coil 134 is formed to face the horizontal boundary of the magnet 136 magnetic field. do.

Then, as shown in FIG. 7, when a counterclockwise current flows through the coil 134, the Lorentz force is generated to the left, and the holder 131 rotates counterclockwise.

As shown in FIG. 8, when a clockwise current flows through the coil 134, the Lorentz force is generated to the right, and the holder 131 rotates clockwise.

Therefore, as the holder 131 rotates, the position at which the second light is incident on the recording medium 40 through the hole 132 may change.

Preferably, in the reflective mirror 140, even if the holder 131 is rotated by a predetermined angle to change the position of the hole 132, a predetermined amount of the reflected second light is recorded through the hole 132. It is formed wide so as to be incident on the medium 40.

If the arrangement of the N pole and the S pole in the magnet 136 is reversed, the rotation direction of the holder 131 rotates in the opposite direction to the direction of the current. That is, when the direction of the current flowing through the coil 134 is counterclockwise, the holder 131 rotates clockwise, and when the direction of the current flowing through the coil 134 is clockwise, the holder 131 is half Rotate clockwise.

In addition, the coil 134 and the magnet 136 may be formed at both sides of the hole 132 as shown, or may be selectively formed at only one side.

If the holes 132 are formed at both sides of the hole 132, the current flowing through the coils 134 formed at both sides of the holder 131 by the magnetic circuit formed at both sides is the same. Orientation, or the arrangement of the north pole and the south pole of the magnet 136 formed on both sides can be adjusted.

In addition, a coil holder may be further provided on a side surface of the holder 131 to facilitate installation of the coil 134. Then, the coil 134 may be supported and fixed to the coil holder.

However, as another embodiment, it is possible to control the rotation of the holder 131 so that the magnet is formed in the holder 131, and the coil is formed in the support member 135.

As described above, the actuator 100 according to the present invention configured as described above is located on the path S2 of the second light of the data recording and reproducing apparatus, and the base member 120 is adapted to the rotation of the motor 112. In addition to sliding along the A-direction, the holder 131 can rotate by the interaction of the coil 134 and the magnet 136 in response to the application of a control current.

Therefore, as the actuator 100 is operated, the incident position of the second light incident on the recording medium 40 may change due to the movement of the base member 120 and the rotation of the holder 131. have.

The data recording and reproducing apparatus according to the present invention is simple in structure and can be configured in a small size by using a slim actuator 100 having a small volume.

9 is a view showing that the interference pattern is formed on the recording medium by the data recording apparatus according to the present invention.

Referring to FIG. 9, interference patterns 430 ˜ 434 are formed at a changed position of the recording medium 40 according to the rotation of the holder 131 in the actuator 100.

As shown, the interference patterns 430 to 434 are formed in an arc shape having a predetermined angle. This is because the shape of the second light incident on the recording medium 40 through the hole 132 is formed in an arc shape as the holder 131 rotates.

In addition, the interference patterns 435 to 439 are formed at positions changed as the base member 120 is moved in the A-direction in the actuator 100.

As described above, the data recording and reproducing apparatus according to the present invention can store a large amount of data on the recording medium at a high speed according to the movement of the base member 120 of the actuator 100 and the rotation of the holder 131.

The data recording and reproducing apparatus according to the present invention is formed in a small size by using an actuator having a slim and simple structure, so that a large amount of data can be recorded and reproduced at a high speed.

Claims (11)

shaft; A base member coupled to the shaft and moved; A holder rotatably coupled to the base member, the holder having a hole through which light passes; A reflection mirror reflecting light into the hole; And Actuator includes a magnetic circuit for causing the holder to rotate. The method of claim 1, And a motor for allowing the shaft to rotate to move the base member coupled to the shaft. The method of claim 1, The base member is positioned on a movement path of the second light separated by a predetermined optical separator, and the reflection mirror is positioned below the hole to be inclined at a predetermined angle so that the second light is reflected to the hole. Actuator. A holder in which a hole is formed and rotatably formed; A magnetic circuit for rotating the holder; And a reflection mirror reflecting the second light separated by a predetermined optical separator into the hole. And a portion of the second light reflected from the reflecting mirror passes through the hole as the holder rotates. The method of claim 4, wherein The hole is formed on one side of the upper surface of the holder, And the reflecting mirror is formed under the holder. The method of claim 4, wherein And a support member configured to surround the holder, the support member supporting the holder, wherein the reflection mirror is formed in the support member and positioned below the hole. A holder through which a second light separated by a predetermined optical separator passes, and formed to be rotatable; It includes a magnetic circuit for rotating the holder, And the second light incident on the recording medium through the hole as the holder rotates is formed in an arc shape. The method of claim 7, wherein And a reflection mirror positioned on the path of the second light and reflecting the second light to the hole. Light source; A light separator configured to separate light generated from the light source into first light and second light; A spatial light modulator for including data to be recorded in the first light separated by the optical splitter; A mirror to allow the first light output from the spatial light modulator to enter a predetermined position of the recording medium; And An actuator for changing an incident position of the second light separated by the optical separator; The actuator may include a reflection mirror positioned on the path of the second light to reflect the second light, a holder through which a hole through which the second light reflected from the reflection mirror passes, and the holder may be rotatably coupled to the actuator. And a base member and a shaft for moving the base member. Light source; A light separator configured to separate light generated from the light source into first light and second light; An actuator for controlling the incident position such that the second light is incident on the interference pattern of the recording medium; And And an image sensor for converting the second light passing the interference pattern into an electrical signal. The actuator may include a reflection mirror positioned on the path of the second light to reflect the second light, a holder through which a hole through which the second light reflected from the reflection mirror passes, and the holder may be rotatably coupled to the actuator. And a base member and a shaft for moving the base member. Light source; A light separator configured to separate light generated from the light source into first light and second light; A spatial light modulator for including data to be recorded in the first light separated by the optical splitter; A mirror to allow the first light output from the spatial light modulator to enter a predetermined position of the recording medium; An actuator for controlling an incident position of the second light such that the second light separated by the optical separator interferes with the first light on the recording medium; And And an image sensor for converting second light passing through the recording medium into an electrical signal. The actuator may include a reflection mirror positioned on the path of the second light to reflect the second light, a holder through which a hole through which the second light reflected from the reflection mirror passes, and the holder may be rotatably coupled to the actuator. And a base member and a shaft for moving the base member.

Images