KR20090091922A - The data recording/reproducing method and apparatus - Google Patents

Abstract

A data recording/reproducing method and apparatus are provided to utilize wasted part of the recording medium to the utmost by constructing various types of holography. A data recording/reproducing method includes a step of letting signal beam and reference beam enter a unit recording region of a recording medium(100), wherein the signal beam contains data and the reference beam interferes with the signal beam, and a step of letting the signal beam and the reference beam enter the unit recording region while varying incident position of the signal beam and the incident angle of the reference beam.

Description

The data recording / reproducing method and apparatus

The present invention relates to a data recording / reproducing method and a recording / reproducing apparatus. In particular, the present invention relates to a data recording / reproducing method and a recording / reproducing apparatus using holography.

An apparatus for recording / reproducing information on a recording medium such as a compact disc (CD) or a digital versatile disk (DVD) currently in use records information on a tomography recording surface of a recording medium or reproduces information recorded on a tomography recording surface. . Although the storage capacity can be increased by stacking the recording / reproducing surfaces of the recording medium, the recording / reproducing surface that can be stacked on a single recording medium is about four layers, and thus the storage capacity increases. Due to such a problem of storage capacity limitation, recently, holographic storage technology has attracted attention.

Holography is a technology that can reproduce an optical signal as it is, and saves an interference pattern generated by a signal light having information and a reference light irradiated from an angle different from the signal light in a recording medium, or by using diffraction of the stored interference pattern. It is a skill to play. When holography is used for data recording, the interference pattern can be recorded in three-dimensional space in the thickness direction of the recording medium, so that the storage capacity can be drastically increased. In addition, when information is recorded while changing the incident angle, phase, wavelength, etc. of the reference light, it is possible to record holographic information of several pages with a constant recording capacity, and thus a plurality of pages can be recorded at one position of the recording medium track. .

Holographic storage allows for volume-based storage that can store tens or even several pages of data in the same space. Currently, angle multiplexing and coaxial multiplexing are typically used as the storage unit by volume, but the reality is that angle multiplexing is widely used because more efficient media can be used.

In the case of angular multiplexing, a state in which tens or hundreds of pages of data are stored in the same location is called a book, and a space that does not cause mutual interference between stored books is required, and thus the storage capacity of the disk is determined. do.

In one book, multiplexing is performed by varying the angle between data pages. If more than one hundred pages are recorded in the same location due to the storage capacity of the recording medium, the interference between each data page becomes large and the storage state is not uniform. have.

The present invention reflects the above situation, and the present invention relates to a data recording / reproducing method and a recording / reproducing apparatus for increasing storage capacity in holographic technology.

 SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the step of injecting a signal light including data into the unit recording area of the recording medium and the reference light causing interference with the signal light, and changing the incident position of the signal light and the incident angle of the reference light Provided is a data recording / reproducing method comprising the step of injecting light into a unit recording area.

In addition, the data recording / reproducing method provides a data recording / reproducing method applied to holographic.

Further, the unit recording area provides a data recording / reproducing method corresponding to an area of a recording medium in which initial signal light is incident and reference light causes interference while changing the incident angle.

Further, the rule in which the incident position of the signal light is changed provides a data recording / reproducing method corresponding to any one of a straight line, a square, a rhombus, and a circle.

Still another object of the present invention is to irradiate a recording medium with a signal light including data and a reference light causing interference with the signal light and at a predetermined interval within a range of the first incident angle set at the same irradiation position of the signal light. Irradiating the recording medium by changing the angle of incidence, moving the signal light within a predetermined range from the position where the signal light is irradiated onto the recording medium, irradiating the recording medium, and continuing the reference light at a predetermined interval within the range of the set second incident angle. It provides a data recording / reproducing method comprising the step of irradiating the recording medium by changing the incident angle.

In addition, the range of the first incident angle and the range of the second incident angle provide a data recording / reproducing method which does not overlap.

In addition, the data recording / reproducing method includes moving the signal light from the irradiated position of the recording medium within a predetermined range to irradiate the recording medium, and continuing the reference light to change the angle of incidence at a predetermined interval within the range of the set Nth incident angle. It provides a data recording / reproducing method further comprising the step of irradiating a recording medium.

Further, the movement within a predetermined range of the signal light provides a data recording / reproducing method for drawing any one of a straight line, a square, a rhombus and a circle.

Still another object of the present invention is to irradiate a recording medium with a signal light including data and a reference light causing interference with the signal light, the angle of incidence at a predetermined interval within the range of the first incident angle set by the reference light at the same irradiation position of the signal light. Irradiating the recording medium by changing the angle of light, moving the recording medium within a predetermined range from the position where the signal light is irradiated onto the recording medium, and continuing the reference light to change the angle of incidence at a predetermined interval within the set second incident angle. A data recording / reproducing method comprising the step of irradiating a medium is provided.

It is still another object of the present invention to change a light generation unit for generating signal light including data in a unit recording area of a recording medium and a reference light causing interference with the signal light, and changing the incident position of the signal light and the angle of incidence of the reference light to unite the two light units. Provided is a data recording / reproducing apparatus including a control section for controlling to enter a recording area.

The data recording / reproducing apparatus also provides a data recording / reproducing apparatus applied to holographic.

Further, the unit recording area provides a data recording / reproducing apparatus corresponding to an area of a recording medium in which initial signal light is incident and reference light causes interference while changing the incident angle.

Further, a rule in which the incident position of the signal light is changed provides a data recording / reproducing apparatus corresponding to any one of a straight line, a square, a rhombus, and a circle.

Still another object of the present invention is to change and record an incident angle at a predetermined interval within a range of set incident angles of a light generating unit for generating a signal light including data and a reference light causing interference with the signal light, and at the same irradiation position of the signal light. Provided is a data recording / reproducing apparatus including a first optical path adjusting unit for irradiating a medium and a second optical path adjusting unit for moving the signal light to a recording medium within a predetermined range from a position at which the signal medium is irradiated to the recording medium.

Further, the movement within a predetermined range of the signal light provides a data recording / reproducing apparatus which draws any one of a straight line, a square, a rhombus and a circle.

Still another object of the present invention is to change and record an incident angle at a predetermined interval within a range of set incident angles of a light generating unit for generating a signal light including data and a reference light causing interference with the signal light, and at the same irradiation position of the signal light. Provided is a data recording / reproducing apparatus including a first optical path adjusting portion for irradiating a medium and a recording medium conveying portion for moving a recording medium within a predetermined range from a position at which signal light is irradiated onto the recording medium.

Further, the movement within a predetermined range of the signal light provides a data recording / reproducing apparatus which draws any one of a straight line, a square, a rhombus and a circle.

According to the present invention, in the angular multiplexing method of the holographic technology, the problem of multiplexing only tens of pages at the same location due to the characteristics of the recording medium is solved, thereby increasing the data storage capacity up to several hundred pages in the same book.

In addition, it is possible to make the most of the waste of the recording medium through various types of holography configuration has a great advantage in terms of media utilization.

1 is a block diagram showing the configuration of an embodiment of a data recording / reproducing apparatus according to the present invention together with a recording medium.

2 to 4 are diagrams illustrating an interior of the first optical path adjusting unit.

5 to 7 are diagrams illustrating multiplexing between the reference light and the signal light.

8 and 9 are diagrams showing that a recording area of data is made in a book area.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this context, the term " recording medium " as used herein means any medium on which data is recorded or capable of recording data. An example may be an optical disc. Incidentally, the term " recording / reproducing device " includes a recording device capable of recording only, a playback apparatus capable of reproducing only, and a device capable of both recording and reproducing.

In addition, the term used in the present invention was selected as a general term widely used as possible, but in certain cases, the term is arbitrarily selected by the applicant, and in this case, it should be understood that the present invention is understood as a meaning of a term rather than a name. Let's do it.

1 is a block diagram showing the configuration of an embodiment of a data recording / reproducing apparatus according to the present invention together with a recording medium.

The light source 210 is composed of a gas laser, a solid state laser, a semiconductor laser, a semiconductor diode, or the like which generates light having a very high coherence, for example, a laser beam. A collimation lens may be disposed at the output end of the light source 210 to collect the light output from the light source 210 so as not to be dispersed.

The light output from the light source 210 passes through at least one optical element such as a separation compound for path change and separation. The separation composition may be composed of one or more transparent substrates and one or more grating layers diffracting light, or may be composed of a mirror that reflects part of the light and transmits the rest. Through this, the incident light can be divided into a signal light and a reference light. For example, the light may be configured to partially transmit incident light and partially reflect incident light depending on the polarization direction.

The optical modulator 220 includes a signal pattern (data pattern) in the signal light when recording data. For example, the optical modulator 220 may be configured to include binary data represented by a black and white dot pattern in the signal light irradiated onto the recording medium.

The first optical path adjusting unit 230 adjusts the incident angle, direction, wavelength, phase, etc. of the incident reference light to irradiate the recording medium 100. Specifically, the first optical path adjusting unit 230 multiplexes the angles of the reference light in order to record or reproduce data on the recording medium using a holographic technique. Here, multiplexing means recording or reproducing data while continuously changing the incident angle of the reference light irradiated onto a predetermined area of the recording medium. This method can store hundreds to thousands of holograms organized in page units of binary data in the same location. In other words, by recording or reproducing a lot of data on a recording medium 100 in units of pages, data can be recorded or reproduced at a high storage density.

FIG. 2 to FIG. 4 schematically show a configuration of a specific embodiment of the first optical path adjusting unit 230. As shown in the drawing, the first optical path adjusting unit 230 includes a first adjusting member 231 having a reflecting surface that can rotate or move to reflect the reference light to adjust the incident angle or direction of the reference light, and the incident light is adjusted. It includes a second adjusting member 232 for irradiating a predetermined position of the recording medium 100. The apparatus may further include a reflecting surface driver configured to rotate or move the reflecting surface according to a control signal of the controller.

In this embodiment, the first adjusting member 231 is provided with a rotatable reflective surface, and the light entering the second adjusting member 232 as the reflecting surface of the first adjusting member 231 rotates. Adjust the angle of incidence to change. The second adjusting member 232 irradiates the light having the adjusted angle of incidence to a specific portion of the recording medium 100 regardless of the angle of incidence. Even when the angle incident on the second adjusting member 232 is changed by the rotation of the first adjusting member 231, the light transmitted through the second adjusting member 232 is the same as that of the recording side L0 included in the recording medium. The position Y is irradiated. To this end, the second adjusting member 232 includes two lenses of the first lens 232a and the second lens 232b, or each of the first lens 232a and the second lens 232b uses two lenses. Various modifications are possible, such as being configured to include all four lenses.

The image sensor unit 240 is a part of photographing a data image. The image sensor unit 240 includes an image sensor composed of a semiconductor imaging device such as a charge-coupled device (CCD).

The first embodiment of the present invention may include a second optical path adjusting unit 250.

The second optical path adjusting unit 250 adjusts the position at which the signal light is irradiated onto the recording medium.

The second embodiment of the present invention may include a recording medium conveying unit (not shown).

The recording medium transfer unit serves to transfer the recording medium. That is, the present invention plays a role of moving the recording medium in the process of re-irradiating the recording medium after irradiating the reference light by varying the angle in a predetermined range, but is not limited thereto.

In the present invention, the second optical path adjusting unit and the recording medium conveying unit can be selectively applied, and both can be used.

The following describes the recording / reproducing method using the recording / reproducing apparatus of the present invention in detail. The light emitted from the light source 210 is separated into a signal light and a reference light and irradiated to the recording medium 100. The signal light is light in which a data signal is stored, and the light modulator 220 stores binary data in the signal light in various ways. The reference light is irradiated onto the recording medium 100 while the incident angle is changed by the first optical path adjusting unit 230. As the angle of incidence changes, data pages of multiple pages may be superimposed on one area of the recording medium 100. In this case, the first optical path adjusting unit 230 may be controlled to change the incident angle by the controller.

In the first embodiment of the present invention, when the irradiation of the angle range set by the adjustment of the first optical path adjusting unit 230 is finished, the area of the recording medium irradiated with the signal light by using the second optical path adjusting unit 250. Moves the irradiation point of the signal light within the setting range. Thereafter, the first optical path adjusting unit 230 is used to start irradiation with the recording medium 100 while changing the incident angle following the last last incident angle. In this case, only the incident angle is changed without changing the irradiation position of the reference light. The irradiation angle at this time is made within the set angle range. In addition, the interval for changing the angle of incidence preferably corresponds to 0.1 degrees.

It is possible to repeat the process of previously moving the second optical path adjusting unit and subsequently changing the incident angle using the first optical path adjusting unit and irradiating the reference light. That is, the set angular range is divided into one set each, and when the irradiation is completed for each set, the signal light may be moved to repeat the next set.

The setting range in the area of the recording medium irradiated with the signal light corresponds to a range not exceeding a book interval. A book means an area of the recording medium 100 in which information is superimposed and recorded by a multiplexing method. That is, in the present invention, it is within the recording area range of the recording medium according to the angle change of the first optical path adjusting unit 230.

In the second embodiment of the present invention, the movement of the recording medium by the recording medium conveying unit is centered instead of the second optical path adjusting unit.

When the irradiation of the angular range set by the adjustment of the first optical path adjusting unit 230 is completed, the recording medium is moved within the setting range in the area of the recording medium to which the signal light is irradiated by using the recording medium conveying unit (not shown). Thereafter, the first optical path adjusting unit 230 is used to start irradiation with the recording medium 100 while changing the incident angle following the last last incident angle. At this time, the position of the reference light and the signal light itself does not change, and only the incident angle of the reference light changes. The irradiation angle at this time is made within the set angle range.

It is possible to repeat the process of previously moving the recording medium and subsequently changing the angle of incidence using the first optical path adjusting unit and irradiating the reference light. That is, the set angle range is divided into one set each, and when the irradiation is completed for each set, the recording medium may be moved to repeat the next set.

The setting range in the area of the recording medium irradiated with the signal light corresponds to a range not exceeding a book interval. A book means an area of the recording medium 100 in which information is superimposed and recorded by a multiplexing method. That is, in the present invention, the recording area range of the recording medium or the irradiation range of the signal light and the reference light according to the angle change of the first optical path adjusting unit 230 is included.

5 to 8 show that the signal light and the reference light are incident on the recording medium and multiplexed.

As described above, the book means an area of the recording medium 100 in which information is superimposed and recorded by the multiplexing method. As illustrated in FIG. 5, a portion where the reference light is irradiated with different angles at a position where the signal light is irradiated is called a drum.

In the present invention, it corresponds to the irradiation range of the reference light according to the signal light and the angle change.

6 shows a recording range of a recording medium according to an embodiment of the present invention. After the first signal light is incident and the reference light is irradiated at different angles, after moving the signal light as in Example 1 or moving the recording medium as in Example 2, the reference light continues at the last incident angle at the same position of the recording medium. The process of performing irradiation by changing the angle is shown.

FIG. 7 illustrates a recording area of a recording medium according to an embodiment of the present invention, which shows that the recording area can be enlarged according to the movement of the signal beam and the existing waste area can be recorded.

8 and 9 show that the recording area of the recording medium is made in the book area. The recording / reproducing method and the recording / reproducing apparatus as described above are intended to increase the recording capacity in the existing book area and reduce the wasted recording area. The movement range of the signal light or the recording medium is also limited to the book area.

In FIG. 9, various directions of movement of the signal light or the recording medium in the book area are shown, which shows that the recording area is enlarged by moving the signal light or the recording medium in the book area in a straight line, square, rhombus or circle.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (17)

 Injecting a signal light including data into a unit recording area of a recording medium and a reference light causing interference with the signal light; And And injecting the two lights into the unit recording area while changing the incident position of the signal light and the incident angle of the reference light. The method of claim 1, The data recording / reproducing method is a data recording / reproducing method applied to holographic. The method of claim 1, And the unit recording area corresponds to an area of a recording medium in which initial signal light is incident and the reference light causes interference while changing the incident angle. The method of claim 1, The rule that the incident position of the signal light is changed corresponds to any one of a straight line, a square, a rhombus, and a circle. Irradiating a recording medium with signal light including data and reference light causing interference with the signal light; Irradiating the recording medium by changing the incident angle at an interval of a predetermined interval within the range of the set first incident angle at the same irradiation position of the signal light; Illuminating the recording medium by moving the signal light within a predetermined range from a position where the signal light is irradiated onto the recording medium; And And irradiating the recording medium by changing the angle of incidence at an angle of the predetermined interval within the range of the second angle of incidence, wherein the reference light is continuously set. The method of claim 5, wherein And the range of the first incident angle and the range of the second incident angle do not overlap. The method of claim 5, wherein The data recording / reproducing method includes the steps of: irradiating the recording medium by moving the signal light within a predetermined range from the irradiated position of the recording medium; And And irradiating the recording medium with the reference light continuously changing the angle of incidence at an angle of the predetermined interval within the range of the set Nth angle of incidence. The method of claim 5, wherein The data recording / reproducing method of moving the signal light within a predetermined range draws any one of a straight line, a square, a rhombus, and a circle. Irradiating a recording medium with signal light including data and reference light causing interference with the signal light; Irradiating the recording medium by changing the incident angle at an interval of a predetermined interval within the range of the set first incident angle at the same irradiation position of the signal light; Moving the recording medium within a predetermined range from a position at which signal light is irradiated onto the recording medium; And And irradiating the recording medium by changing the angle of incidence at an angle of the predetermined interval within the range of the second angle of incidence, wherein the reference light is continuously set.  A light generator for generating signal light including data in the unit recording area of the recording medium and reference light causing interference with the signal light; And And a control unit which controls the two lights to enter the unit recording area while changing the incident position of the signal light and the incident angle of the reference light. The method of claim 10, The data recording / reproducing apparatus is a data recording / reproducing apparatus applied to holographic. The method of claim 10, And the unit recording area corresponds to an area of a recording medium on which first signal light is incident and the reference light causes interference while changing the incident angle. The method of claim 10, And a rule in which the incident position of the signal light is changed corresponds to any one of a straight line, a square, a rhombus, and a circle. A light generator for generating signal light including data and reference light causing interference with the signal light; A first optical path adjusting unit which irradiates the reference medium with the reference light at a predetermined interval within the range of the incident angle of the signal light and changes the angle of incidence to the recording medium; And And a second optical path adjusting unit which moves the signal light within a predetermined range from a position where the signal light is irradiated onto the recording medium and irradiates the recording medium. The method of claim 14, A data recording / reproducing apparatus, wherein the movement within the predetermined range of the signal light draws any one of a straight line, a square, a rhombus, and a circle. A light generator for generating signal light including data and reference light causing interference with the signal light; A first optical path adjusting unit which irradiates the reference medium with the reference light at a predetermined interval within the range of the incident angle of the signal light and changes the angle of incidence to the recording medium; And a recording medium conveying unit for moving the recording medium within a predetermined range from a position at which signal light is irradiated onto the recording medium. The method of claim 16, A data recording / reproducing apparatus, wherein the movement within the predetermined range of the signal light draws any one of a straight line, a square, a rhombus, and a circle.