KR20050116272A - Optical recording apparatus for storing bit unit - Google Patents

Abstract

The present invention provides a holographic optical recording and reproducing apparatus capable of accurately recording and reproducing information on a holographic recording medium or the like without a bit error using a one-dimensional diffraction optical modulator.

Description

Optical recording apparatus for storing bit unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holographic optical recording / reproducing apparatus for storing in bit units, and more particularly, to an optical recording apparatus capable of recording and reproducing information in one bit unit in a holographic recording medium, DVD and CD.

Currently, holographic digital data storage systems using semiconductor lasers, charge coupled devices (CCDs), and liquid crystal displays (LCDs) have been actively researched and developed. Holographic digital data storage system has the advantages of large capacity and ultra-fast data transfer speed, so it is not only being used as a fingerprint reader and display device for storing and playing fingerprints, but also its application field is gradually expanding. .

Such a holographic digital data storage system interferes with the object light transmitted from the object and the reference light, and then reacts the interference fringe generated by the interference differently according to the amplitude and phase of the interference fringe. Three-dimensional holographic digital data in page units of binary data are stored by recording in a storage medium such as a refractive crystal or a polymer.

Then, the object light is blocked and only the reference light is provided to the storage medium to reproduce the stored three-dimensional data. The holographic digital data is generally recorded and reproduced as square image data having the same form as a display screen in units of pages. However, since an alignment is required for accurate reproduction, an alignment mark is usually formed at the edge of the holographic data page. However, if the alignment marks of the data page form a pixel-to-pixel image on the CCD, if the alignment is not correct, the alignment mark may bleed to the pixel next to the CCD, thereby preventing accurate alignment. For this purpose, U.S. Patent No. 6064586 proposed a new method of storing and reproducing holographic data on alignment, and the mark related to alignment is displayed in bold in three columns on both vertical lines among the pixels of the holographic data page. However, due to the characteristics of the holographic data recording and reproducing apparatus which measures alignment within ± 0.5 pixels, there is a limitation in that alignment cannot be accurately measured using an intra-pixel alignment mark.

In order to overcome this limitation, Korean Patent Application No. 2002-30147 calculates the regression line of the edges of each page using Fourier approximation of the pixels inserted for the alignment in the data page, and the position and slope of the pixel and the regression line of the page. A holographic data recording and reproducing apparatus for automatically adjusting the alignment of data pages by controlling the actuator for adjusting the reference light angle according to the difference is proposed as in FIG.

1 is a block diagram of a conventional holographic data recording and reproducing apparatus.

Referring to FIG. 1, a conventional holographic data recording and reproducing apparatus includes a light source 100, a light separator 102, a shutter 104 and 110, a reflector 106 and 112, and a spatial light modulator. 114, an actuator 108, a storage medium 116, a CCD 118, a microcomputer 120, a server controller 122, and an image compensation processor 124.

A data page automatic alignment process of a conventional holographic data recording and reproducing apparatus having the above configuration will be described.

First, in the conventional holographic data recording and reproducing apparatus, only the reference light of the recording angle set at the time of data reproduction is irradiated to the storage medium 116 to reproduce the holographic digital data page and transmit it to the CCD 118. Then, the microcomputer 120 selects one row or one column from the data page transmitted from the CCD 118 to perform the automatic alignment method of the data page according to the present invention. The microcomputer 120 approximates a continuous function of the row or column data values with respect to the alignment mark section of the selected row or column.

That is, the microcomputer 120 approximates a continuous function using row or column data values of a data page to process the holographic image at a sub pixel level. In this case, the approximation method is the Fourier approximation method. In the Fourier approximation method, the number of harmonics should be less than half the number of data.

When the alignment mark on the vertical axis is measured using the pixels in the row, the partial derivative for y must be removed because the angle is close to 90 °. The microcomputer 120 then quadratic differentiates the approximated function to obtain the first or second edge value of the data page. The second derivative is used to find the edge of the data page. The quadratic derivative of the approximated function becomes zero and the inflection point is the edge. That is, the first edge value is a value at which the approximated function is maximum and the approximated function is '0', indicating the left edge. The second edge value is a value at which the approximated function is minimum and the approximated function is '0', indicating the right edge.

On the other hand, in the conventional holographic data recording and reproducing apparatus, when the edge value of the data page is obtained, both the first edge value and the second edge value may be used, or only one of them may be used.

The microcomputer 120 selects a row in the data page, selects a row, and then obtains each approximated function from the last row or the next column to the last column in the row, and quadratic differentiates each to obtain each first edge value or second edge value. The microcomputer 120 then obtains a regression line using a fitting method in which the first and second edge values of these rows or columns are the least squares method. If the alignment mark to be measured is located in the middle of the left edge and the right edge, the alignment mark is an average of the left edge and the right edge.

The microcomputer 120 automatically controls the holographic data page by controlling the servo controller 122 of the actuator 108 that adjusts the angle of the reference light when the position or the slope of the regression line does not have the distance or the slope set to a predetermined position of the data page. Align with.

For example, if the position of the measured regression line is 7 pixels apart from the 0.5 pixel distance of the normal data page, the servo controller 122 controls the actuator 108 to be moved by -7 pixels for reproduction. The data page reproduced in the CCD 118 is then reproduced accurately in the 0.5 pixel range.

On the other hand, if the position or the slope of the regression line does not have the distance or the slope set to a predetermined position of the data page, the microcomputer 120 sends the data page to the image compensation processor 124 to digitally process the image of the holographic data page. Compensate. That is, the image compensation processor 124 may automatically align the image of the data page by moving the image of the data page by a difference between the measured position or the slope of the regression line up to a predetermined position of the data page.

However, in the case of the conventional holographic data recording and reproducing apparatus as described above, since an error about the spatial position occurs during data recording on the holographic recording medium using a spatial light modulator, a separate correction apparatus and There was a problem that the installation of the additional device.

In addition, the conventional holographic optical recording device has a problem in that it is incompatible with a DVD or a CD that needs to record information in units of bits because it stores information in units of pages.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical recording and reproducing apparatus capable of accurately recording and reproducing information on a bit-by-bit basis in a holographic recording medium using a one-dimensional diffractive optical modulator. have.

SUMMARY OF THE INVENTION An object of the present invention is to provide a holographic optical recording apparatus compatible with a disk-type storage medium such as a DVD or a CD by recording information in various bit units by using a one-dimensional diffractive optical modulator. .

According to the present invention, by multiplexing the irradiation angle of a reference beam diffracted through a one-dimensional diffraction type optical modulator when recording data in a bit unit such as a holographic recording medium, a fast addressing speed in nanoseconds and a spatial position of data recording can be precisely controlled. It is an object to provide an optical recording device capable of.

The present invention compensates for errors by preventing the occurrence of errors in high-speed addressing time and spatial position of data recording by multiplexing the irradiation angle of the diffraction beam by using a one-dimensional diffraction type optical modulator when recording data in one bit unit to various storage media. It is an object of the present invention to provide an optical recording device that does not use a separate correction circuit and an additional device.

The present invention for achieving the above object, the light generation and irradiation means for irradiating a beam generated by generating a beam in one direction; A signal beam and reference beam generating means for diffracting and modulating a beam incident from the light generating and irradiating means to generate a signal beam consisting of one bit and generating a reference beam having the same angle or different angles; And beam irradiation means for irradiating a recording medium with the reference beam and the signal beam generated from the signal beam and the reference beam generating means.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2A is a block diagram of an optical recording apparatus for storing in units of bits according to an embodiment of the present invention.

Referring to FIG. 2A, the optical recording apparatus 200 of the present invention diffracts a light generation and irradiation unit 210 for irradiating a beam generated by generating a beam in one direction, and a beam incident from the light generation and irradiation unit 210. And a signal beam and reference beam generator 220 and a signal beam and reference beam generator 220 for generating a signal beam composed of one bit by modulating and generating a reference beam having the same angle or different angles. The beam irradiator 230 irradiates the reference beam and the signal beam to the holographic recording medium 240.

The light generating and irradiating unit 210 includes a light source 211 for generating a beam, at least one balanced light lens 212 for transforming a beam generated from the light source 211 into parallel light, and at least one balance A cylinder lens 213 is provided to irradiate a beam transformed into parallel light through the optical lens 212 to a diffractive optical modulator in the form of an ID array.

The light source 211 may be implemented with a laser or laser diode LD that generates a laser beam. Here, the laser diode, which is the light source 211, has a relatively low output, because it can allow a long irradiation time of the laser diode required for exposure to a single pixel because it irradiates a plurality of beams at the same time.

At least one balanced light lens 212 is disposed between the light source 211 and the cylinder lens 213, when two or more balanced light lenses 212, a plurality of balanced light lenses 212 are constant Spaced apart at intervals.

The signal beam and reference beam generator 220 diffracts and modulates the beam irradiated from the light generating and irradiating unit 210 to generate a signal beam composed of one bit, and generates a reference beam having the same angle or different angles. A signal beam generated from the one-dimensional diffraction type optical modulator 221 and irradiated with the one-dimensional diffraction type optical modulator 221 and the beam irradiated from the light generation and irradiation unit 210 with the one-dimensional diffraction type optical modulator 221. A beam spirit 222 for reflecting the reference beam and a focusing lens 223 for focusing the reference beam and the signal beam reflected by the beam spirit 222.

The one-dimensional diffraction type optical modulator 221 is capable of simultaneous control from at least two pixels to hundreds to thousands of pixels as long as the maximum optical system allows. In addition, the diffraction type optical modulator 221 can control the pixel in the analog, it is possible to control the gray (Gray) when applied to the printer and display products. At this time, the diffraction type optical modulator 221 controls the optical lens and the light projection distance used to control the size of the spot and the distance between the spots.

Due to the above characteristics and structure, the diffraction type optical modulator 221 may control on / off for each pixel when diffracting and modulating a beam incident from the light generating and irradiating unit 210. Accordingly, when the diffraction type optical modulator 221 diffracts and modulates an incident beam to generate a reference beam, the reference beam generated by differentially turning on / off each pixel generating one reference beam at predetermined time intervals. A constant phase difference occurs between them.

The one-dimensional diffraction type optical modulator 221 generates a signal beam through on / off of one pixel specified among a plurality of pixels, and the pixel generating the signal beam is disposed at a central portion of the plurality of pixel arrays. It would be desirable to be. Here, if the pixel for generating the signal beam is ON, a signal beam representing binary '1' is generated, and if the pixel for generating the signal beam is OFF, a signal beam representing binary '0' is generated.

As such, the one-dimensional diffraction type optical modulator employed in the present invention is fixed at a specific position unlike a galvano mirror or polygon mirror moving in space to multiplex the irradiation angle of the one-dimensional beam, thereby turning on / off a plurality of pixels. By generating reference beams of different angles through the optical recording apparatus of the present invention, the optical recording apparatus of the present invention has an advantage of not generating errors in addressing time and spatial position in nanoseconds.

The beam irradiator 230 includes a slit 231 for transmitting only diffraction beams of a predetermined order among the signal beam and the reference beam incident from the signal beam and the reference beam generator 220, and the signal irradiated through the slit 231. Focusing the balanced light lens 232 and the signal beam and the reference beam irradiated through the balanced light lens 232 to the predetermined address of the holographic recording medium 240 A focusing lens 233 is provided.

The slit 231 passes only diffraction signal beams of a predetermined order among the signal beams and the reference beams focused through the focusing lens 223. For example, when the order of the signal beam and the reference beam diffracted by the diffractive light modulator 231 is -1st, 0th, + 1st order, and the slit 231 is set to pass only the + 1-dimensional diffraction beam The slit 231 passes only the + 1-dimensional diffraction beam.

The focusing lens 233 accurately focuses the signal beam and the reference beam irradiated through the balanced light lens 232 at a predetermined address of the holographic recording medium 220, in which the bits constituting the signal beam are the holographic recording medium ( This is to ensure that the data can be recorded accurately at a predetermined address of the 220.

FIG. 2B is an exemplary view illustrating an irradiation angle control method of a diffraction beam using a one-dimensional diffraction type optical modulator applied to the present invention. FIG.

As shown in FIG. 2B, a signal beam consisting of a reference beam and one bit is simultaneously generated from the one-dimensional diffraction type optical modulator 221, and the signal beam and the reference beam are focused through the focusing lens 233 to be holographic. The specific address of the recording medium 240 is irradiated.

As shown in the drawing, a signal beam is generated from one pixel located at the center of the plurality of pixels constituting the one-dimensional diffraction type optical modulator 231 and a reference beam is generated from other pixels. In this case, the reference beam is irradiated at the same angle or at different angles according to the on / off time intervals of the pixels for generating the reference beam.

The operation of the optical recording device of the present invention having the above structure will be described in detail as follows.

When the light source 211 generates a beam, the balanced light lens 212 transforms the beam generated from the light source 211 into parallel light to irradiate the cylinder lens 213, and then the cylinder lens 213 emits the beam. Irradiation with the beam spirit 213.

The beam spirit 213 transmits the beam irradiated through the cylinder lens 212 to the one-dimensional diffraction type optical modulator 221. At this time, the one-dimensional diffraction type optical modulator 231 diffracts and modulates the irradiated beam to generate a signal beam and a reference beam, and irradiates the beam spirit 222. Here, the signal beam diffracted and modulated by the one-dimensional diffraction type optical modulator 231 is irradiated with one bit. In addition, although the phases of the reference beams generated from each pixel of the one-dimensional diffraction type optical modulator 231 are all the same, the angles of the recording medium and the reference beam are different from each other. For example, if each pixel of the one-dimensional diffraction type optical modulator 221 is controlled to be turned on / off at the same time when the reference beam is generated, the phase of the reference beam generated from each pixel is the same, whereas each pixel is constant when the reference beam is generated. When controlled to be turned on / off at a time interval, the reference beams generated from each pixel have different irradiation angles.

As such, when the signal beam and the reference beam are generated, the beam spirit 222 reflects the signal beam and the reference beam toward the focusing lens 223, and then the focusing lens 223 focuses the signal beam and the reference beam to slit. (223).

At this time, if only the diffraction beam of a predetermined order is passed in the direction of the balanced light lens 232 among the signal beam and the reference beam focused slit 223, the balanced light lens 232 receives the signal beam irradiated through the slit 223 The light is transformed into balanced light and irradiated with the focusing lens 233. The focusing lens 237 focuses the balanced signal beam and irradiates the holographic recording medium 240.

On the other hand, the data recorded in the holographic recording medium 240 is irradiated with the photodetector 250.

Then, in order to help understand the cause of generating a reference beam of a different angle from the signal beam at a fixed position, the one-dimensional diffraction type optical modulator applied to the present invention will be described in detail with respect to its structure and operation characteristics see.

In general, a piezoelectric / electric distortion diffraction type optical modulator diffracts a single beam type linear light incident from a lens to form a diffraction beam having a predetermined diffraction coefficient, and then scans the diffraction beam horizontally onto the photosensitive surface. It comprises a plurality of actuating cells 320 having a thin film and a thick film structure of a predetermined shape.

That is, as illustrated in FIG. 3, the piezoelectric / electric distortion diffraction type optical modulator includes a lower electrode 321 formed on a predetermined substrate 310 and a piezoelectric / distortion layer formed on the lower electrode 321. 322 and the upper electrode 323 formed on the piezoelectric / electric strain layer 322, the vertical film length of the vertical direction is vertically driven by the drive power applied from the outside is longer than the length in the horizontal direction It comprises a gating cell 320.

In this case, the piezoelectric / electric distortion diffraction type optical modulator, as shown in FIG. 4, in consideration of the structural features of the scanning device, the actuating cell 320 having a thick film shape in which the length in the horizontal direction is longer than the length in the vertical direction. It can also be configured to include.

In addition, the piezoelectric / electric distortion diffraction type optical modulator, as shown in FIGS. 5 and 6, the micromirror 324 for maximizing the reflection efficiency of incident light incident on the upper electrode 323 operating as the reflective surface. ) Can be configured to further include.

As shown in FIG. 7, the piezoelectric / electric distortion diffraction type optical modulator includes a lower electrode 321 and a piezoelectric / distortion layer on a silicon substrate 310 having a depression for providing an air space in a central portion thereof. 322 and the upper electrode 323, the length of the vertical direction driven by the drive power applied from the outside is configured to include a thin film-shaped actuating cell 320 longer than the length of the horizontal direction.

At this time, the piezoelectric / electric distortion diffraction type optical modulator, as shown in Figure 8, in consideration of the structural characteristics of the scanning device, the thin film-shaped actuating cell 320 is longer than the length in the longitudinal direction in the longitudinal direction It may be configured to include.

In addition, the piezoelectric / electric distortion diffraction type optical modulator, as shown in FIGS. 9 and 10, the micromirror 324 for maximizing the reflection efficiency of incident light incident on the upper electrode 323 operating as the reflective surface. ) Can be configured to further include.

Here, the lower electrode 321 is formed on a predetermined substrate 310 constituting the actuating cell 320 of the thick film structure to provide a driving voltage applied to the piezoelectric / electric distortion layer 322 from the outside. It is formed on the substrate 310 by sputtering or vapor deposition of electrode materials such as Pt, Ta / Pt, Ni, Au, Al, and RuO2.

In addition, the lower electrode 321 is formed on a predetermined substrate 310 or lower support 310 'constituting the actuating cell 320 of the thin film structure to apply a driving voltage applied from the outside to the piezoelectric / electric strain layer ( 322 also serves.

Here, the lower support layer 310 'is as formed is deposited on the silicon substrate 310 to support the piezoelectric / I waecheung 322 of the actuating cell 320 having a thin film structure, SiO _2, Si ₃ It is composed of materials such as N ₄ , Si, ZrO ₂ , Al ₂ O _3, and the lower support 310 ′ may be omitted as necessary.

The piezoelectric / distortion layer 322 is a predetermined piezoelectric / distortion material whose length is changed in the up / down direction or the left and right directions by a piezoelectric phenomenon generated in conjunction with a driving power source applied from the outside, more specifically, PzT. , PNN-PT, ZnO. The lower electrode 321 in a range of 0.01 to 20.0 μm through piezoelectric / electric warping material such as P _b , Zr or titanium by wet (screen printing, Sol-Gel coting, etc.) and dry methods (sputtering, evaporation, vapor deposition, etc.). Is formed on the phase.

The upper electrode 323 is formed on the piezoelectric / electric distortion layer 322 to perform reflection and diffraction for incident light incident from the lens. More specifically, Pt, Ta / Pt, Ni, Au, Al, An electrode material such as RuO 2 is formed in a range of 0.01 to 3 μm through sputtering or vapor deposition.

At this time, the upper electrode 323 operates as a micro mirror for performing reflection and diffraction for the optical signal input from the outside, or Al, which is a predetermined light reflecting material to further enhance the reflection and diffraction for the optical signal, It may be configured to further include a micro mirror 324 composed of Au, Ag, Pt, Au / Cr.

Here, the piezoelectric / electric distortion diffraction type optical modulator is driven in units of pixels 330 in which the actuating cells 320 are grouped in a predetermined number, and the pixels 330 may be provided with a predetermined photosensitive member 600. It corresponds to one point (DOT) of the photosensitive surface which comprises.

That is, the piezoelectric / electric distortion diffraction type optical modulator, as shown in FIGS. 11A and 11B, includes a predetermined number of actuating cells 320 and diffraction phenomenon of the pixels 330 arranged in a one-dimensional shape. By scanning the diffraction beam formed on the photosensitive surface, scanning of one-dimensional shape, more specifically, scanning for one line is performed at the same time.

Here, FIG. 11A illustrates a structure in which pixels formed in a longitudinal direction longer than a horizontal direction are arranged in a one-dimensional shape, and FIG. 11B illustrates a structure in which pixels formed in a horizontal direction longer than a vertical direction are arranged in a one-dimensional shape. One drawing.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention has the following effects by accurately recording information bit by bit in a holographic recording medium or the like using a one-dimensional diffractive optical modulator.

First, by recording information in a bit unit on a holographic storage medium, a holographic data storage system compatible with a disk-type storage medium such as DVD or CD can be constructed.

Second, by multiplexing the irradiation angle of the reference beam diffracted through the one-dimensional diffraction type optical modulator fixed to a specific position when recording data on the storage medium, it is possible to precisely control the fast addressing speed in nanoseconds and the spatial position of the data recording. .

Third, by preventing the occurrence of errors in the fast addressing time and the spatial position of the data recording when recording data on the magnetic field medium, the apparatus can be configured relatively simply without using a separate correction circuit or the like for compensating for the error.

Fourthly, high speed data transfer rate can be increased by precisely controlling the fast addressing speed in nanoseconds and the spatial position of the data recording when data is recorded on the storage medium.

1 is a block diagram of a conventional holographic data recording and reproducing apparatus.

2A is a block diagram of an optical recording apparatus for storing in units of bits according to an embodiment of the present invention.

Figure 2b is an exemplary view illustrating the irradiation angle control method of the diffraction beam using a one-dimensional diffraction type optical modulator applied to the present invention.

3 is a view showing the arrangement of a thick-film actuating cell having a longitudinal direction longer than a horizontal direction constituting a piezoelectric / electric distortion diffraction type optical modulator applied to the present invention.

FIG. 4 is a view showing an arrangement of thick-film actuating cells having a transverse direction longer than the longitudinal direction of the piezoelectric / electric distortion diffraction type optical modulator applied to the present invention. FIG.

5 is a diagram illustrating an arrangement of thick-film actuating cells having a longitudinal direction longer than a horizontal direction in which a micromirror is applied to the piezoelectric / electric distortion diffraction type optical modulators of FIGS. 3 and 4.

FIG. 6 is a view showing an arrangement of thick-film actuating cells having a horizontal direction longer than a vertical direction in which micromirrors are applied to the piezoelectric / electric distortion diffraction type optical modulators of FIGS. 3 and 4.

7 is a view showing an arrangement of a thin-film actuating cell having a longitudinal direction longer than a horizontal direction constituting a piezoelectric / electric distortion diffraction type optical modulator applied to the present invention.

FIG. 8 is a view showing an arrangement of thin-film actuating cells having a transverse direction longer than a longitudinal direction of a piezoelectric / electric distortion diffraction type optical modulator applied to the present invention. FIG.

9 is a view showing an arrangement of thin-film actuating cells having a longitudinal direction longer than a horizontal direction in which micromirrors are applied to the piezoelectric / electric distortion diffraction type optical modulators of FIGS. 3 and 4.

FIG. 10 is a view showing an arrangement of thick-film actuating cells having a transverse direction longer than a longitudinal direction in which micromirrors are applied to the piezoelectric / electric distortion diffraction type optical modulators of FIGS. 3 and 4.

FIG. 11A illustrates a one-dimensional array of pixels including a predetermined number of actuating cells according to the piezoelectric / electric distortion diffraction type optical modulator of FIGS. 3 and 4 and having a longitudinal direction longer than a horizontal direction. FIG.

FIG. 11B illustrates a one-dimensional array of pixels including a predetermined number of actuating cells according to the piezoelectric / electric distortion diffraction type optical modulators of FIGS. 3 and 4, the horizontal direction having a shape longer than the vertical direction.

Claims (11)

Light generating and irradiating means for irradiating a beam generated by generating a beam in one direction; A signal beam and reference beam generating means for diffracting and modulating a beam incident from the light generating and irradiating means to generate a signal beam consisting of one bit and generating a reference beam having the same angle or different angles; And Beam irradiation means for irradiating a recording medium with the reference beam and the signal beam generated from the signal beam and the reference beam generating means Optical recording device comprising a. The method of claim 1, The light generation and irradiation means, A light source for generating a beam; At least one balanced light lens for transforming a beam generated from the light source into parallel light; And A cylindrical lens for irradiating a beam deformed into parallel light in one direction through the at least one balanced light lens Optical recording device comprising a. The method of claim 1, The signal beam and reference beam generating means, A one-dimensional diffraction type optical modulator for diffracting and modulating the beam irradiated from the light generating and irradiating means to generate a signal beam consisting of one bit and generating a reference beam having the same angle or different angles; A beam spirit for transmitting the beam irradiated from the light generating and irradiating means to the one-dimensional diffraction type optical modulator and reflecting the signal beam and the harmonic beam generated from the one-dimensional diffraction type optical modulator; And Focusing lens for focusing the reference beam and the signal beam reflected by the beam spirit Optical recording device comprising a. The method of claim 3, wherein In the one-dimensional diffraction type optical modulator, a signal beam representing a binary number '1' is generated when a pixel generating the signal beam is on, and a signal beam representing a binary number '0' when the pixel generating the signal beam is off. The optical recording device, characterized in that occurs. The method of claim 3, wherein The beam irradiation means, A slit for transmitting only diffraction beams of a predetermined order in the signal beam and the reference beam incident from the signal beam and reference beam generating means; A balanced light lens for transforming the signal beam and the reference beam irradiated through the slit into balanced light; And Focusing lens for focusing the signal beam and the reference beam irradiated through the balanced light lens to irradiate a predetermined address of the recording medium Optical recording device comprising a. The method of claim 5, And when the slit is set to pass only a + 1-dimensional diffraction beam when diffraction of several orders is made by the one-dimensional diffraction type optical modulator, the slit passes only a + 1-dimensional diffraction beam. The method of claim 5, And the one-dimensional diffractive optical modulator is configured to diffract and modulate an incident beam to generate a reference beam, wherein each pixel is simultaneously turned on and off. The method of claim 7, wherein And when each pixel of the one-dimensional diffraction type optical modulator is simultaneously turned on / off, the irradiation angle of each reference beam generated from the one-dimensional diffraction type optical modulator is the same. The method of claim 5, And each pixel is turned on / off at a predetermined time interval when the one-dimensional diffraction optical modulator diffracts and modulates an incident beam to generate a reference beam. The method of claim 9, And when each pixel of the one-dimensional diffractive optical modulator is turned on / off at a predetermined time interval, the irradiation angles of the respective reference beams generated from the one-dimensional diffractive optical modulator are different from each other. The method of claim 10, And the focusing lens irradiates the respective reference beams at different irradiation angles when focusing each reference beam generated by the one-dimensional diffraction type optical modulator onto the recording medium.