JP2011165282A - Device for manufacturing recording medium, and method for manufacturing recording medium using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance productivity in a device for manufacturing a recording medium and in a method for manufacturing the recording medium. <P>SOLUTION: The device for manufacturing the recording medium includes: a diffraction grating 17 diffracting recording light supplied on the other surface side of a hologram disk 19 from a light source 14 into at least zeroth-order recording light 14c, +1st-order recording light 14d and -1st-order recording light 14e; a phase adjustment element 25 adjusting the phase of the +1st-order recording light 14d diffracted by the diffraction grating 17; a polarizing optical element 26 polarizing the +1st-order recording light 14d to an irradiation part of the hologram disk 19 with the zeroth-order recording light 14c; a phase adjustment element 28 adjusting the phase of the -1st-order recording light 14e diffracted by the diffraction grating 17; a polarizing optical element 29 polarizing the -1st-order recording light 14e whose phase is adjusted by the phase adjustment element 28 to an irradiation part with the zeroth-order recording light 14c; and a beam shape molding optical element 23 through which the zeroth-order recording light 14c, the +1st-order recording light 14d and the -1st-order recording light 14e pass. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a recording medium manufacturing apparatus in which a plurality of hologram layers are provided in a multilayer state in a thickness direction, and a recording medium manufacturing method using the recording medium manufacturing apparatus.

  In recent years, in order to increase the recording capacity, a multi-layered recording medium has been proposed as shown in Patent Document 1 below.

  That is, in the one shown in Patent Document 1 below, as shown in FIG. 12C, since a plurality of hologram layers 2 are provided in the thickness direction in the disc-shaped recording medium 1, the recording capacity is Become very large.

  The feature of the conventional example shown in Patent Document 1 is that a plurality of hologram layers 2 in which microholograms 3 are spirally arranged are provided in the recording medium 1. However, it is only necessary to irradiate light from one side of the recording medium 1 toward the microhologram 3 even during reproduction.

  That is, at the time of recording, light is irradiated from one side of the recording medium 1 to the micro-hologram 3 of the recording portion, causing optical alteration, and the portion where the micro-hologram 3 disappears, and the light is not irradiated. Digital recording can be performed by forming a portion where 3 remains.

  Also, during reproduction, digital reproduction can be performed by irradiating light from one side of the recording medium 1 to the disappearing portion of the micro-hologram 3 and the remaining portion of the micro-hologram 3 and reading the reflected light therefrom. it can.

US Pat. No. 7,388,695

  In the above conventional example, the recording medium 1 is manufactured by the following procedure.

  First, as shown in FIG. 9, the reference light 5 is incident on the master disk 4 from one outer surface side (for example, from the upper surface), and from the other outer surface side of the master disk 4 (for example, the lower surface). From the above, recording light 6 is incident on the master disk 4 to form a micro-hologram 7 in the master disk 4, thereby completing the master disk 4.

  Next, as shown in FIG. 10, a conjugated master disk 8 is superposed on the master disk 4, and in this state, parallel light 9 is incident from the conjugated master disk 8 side as shown in FIG.

  Then, as shown in FIG. 11B, the reflected light 10 from the micro-hologram 7 in the master disk 4 is generated, and this reflected light 10 and the parallel light 9 interfere in the conjugated master disk 8, thereby A hologram 11 is formed in the master disk 8. That is, this completes the conjugate master disk 8.

  Thereafter, as shown in FIG. 12A, the recording medium 1 still in a blank disk state is superposed on the conjugate master disk 8, and parallel light 12 is incident from the recording medium 1 side.

  Then, as shown in FIG. 12 (b), the reflected light 13 from the hologram 11 is generated, and the reflected light 13 and the parallel light 12 interfere with each other in the recording medium 1 in the blank disk state, thereby this recording medium. A micro-hologram 3 is formed in 1. That is, the recording medium 1 is completed.

  As apparent from the above description, the conventional method for manufacturing the recording medium 1 requires the master disk 4 and the conjugate master disk 8 to be formed in advance, which is very time-consuming and low in productivity. Met.

  Accordingly, an object of the present invention is to improve the productivity of a recording medium.

  In order to achieve this object, the recording medium manufacturing apparatus of the present invention includes a support that rotatably supports the hologram disk, a reference beam on one side of the hologram disk that is supported by the support, and the other side. A light source for supplying recording light to the recording medium, and recording light supplied from the light source to the other surface side of the hologram disc. Zero-order recording light, at least plus (hereinafter expressed as +) primary recording light, and minus A diffraction grating diffracted into primary recording light (hereinafter expressed as “−”), a first phase adjustment element that adjusts the phase of the + 1st order recording light diffracted by this diffraction grating, and the first phase adjustment element The phase of the + 1st order recording light diffracted by the diffraction grating and the first polarization optical element that guides the phase-adjusted + 1st order recording light to the irradiation part of the hologram disc of the 0th order recording light is adjusted. Second phase tone A second polarization optical element that guides the first-order recording light phase-adjusted by the second phase-adjusting element to the irradiation portion of the hologram disk of the zero-order recording light, and the first, In addition to being interposed between the second polarization optical element and the hologram disc, the zero-order recording light, the + 1st order recording light phase-adjusted by the first phase adjustment element, and the phase adjustment by the second phase adjustment element A beam shape shaping optical element through which the primary recording light passes is provided, thereby achieving the intended purpose.

  As described above, the present invention provides a support that rotatably supports a hologram disk, a light source that supplies reference light to one side of the hologram disk supported by the support, and recording light to the other side, and the light source. The recording light supplied to the other surface side of the hologram disc from zero order recording light, at least plus (hereinafter expressed as +) primary recording light, and minus (hereinafter expressed as −) primary recording light A diffraction grating that diffracts the light, a first phase adjustment element that adjusts the phase of the + 1st order recording light diffracted by the diffraction grating, and a + 1st order recording light that is phase-adjusted by the first phase adjustment element, A first polarization optical element that is polarized and guided to the irradiation part of the hologram disc of the zero-order recording light, a second phase adjustment element that adjusts the phase of the minus first-order recording light diffracted by the diffraction grating, The position is adjusted by the second phase adjustment element. A second polarization optical element that guides the adjusted −1st order recording light to the irradiation part of the hologram disk of the 0th order recording light, and is interposed between the first and second polarization optical elements and the hologram disk. At the same time, the beam shape shaping optics through which the 0th-order recording light, the + 1st order recording light phase-adjusted by the first phase adjustment element, and the −1st order recording light phase-adjusted by the second phase adjustment element pass. Therefore, the productivity of the recording medium can be improved.

  That is, according to the present invention, it is not necessary to previously form a master disk and a conjugated master disk that have been used in the past, and a plurality of hologram layers can be formed directly in a recording medium. It will be expensive.

1 is a configuration diagram showing a recording medium manufacturing apparatus according to a first embodiment of the present invention. Configuration diagram of the main part Configuration diagram of the main part Configuration diagram of the main part Diagram showing the same operating state Diagram showing the same operating state Diagram showing the same operating state Diagram showing the same operating state Figure showing a conventional example Diagram showing the conventional example Diagram showing the conventional example Diagram showing the conventional example

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 shows an embodiment of the present invention. Light from a light source 14 that emits long coherent light having a wavelength of 407 nm is bisected by a half mirror 15, one of which proceeds to a mirror 16 as reference light 14a, and the other is recording light. The process proceeds to the diffraction grating 17 as 14b.

  A transparent rotary table 18 is disposed above the mirror 16 as a support, a hologram disk 19 is supported on the transparent rotary table 18, and a transparent glass substrate 20 is further disposed on the hologram disk 19.

  In this state, a lid 22 is attached to the upper end of the rotary shaft 21, and the hologram disk 19 is thereby rotatably supported by the transparent rotary table 18.

  In this state, the reference light 14 a passes through the transparent rotary table 18 and travels to the hologram disk 19.

  The recording light 14 b that has traveled to the diffraction grating 17 is transmitted through the diffraction grating 17 by a zero-order recording light 14 c, a positive (hereinafter expressed as +) primary recording light 14 d, and a negative (hereinafter expressed as −) primary recording. Diffracted into light 14e.

  Thereafter, these zero-order recording beams 14 c are supplied to the upper surface side of the hologram disk 19 through the beam shaping optical element 23 and the transparent glass substrate 20.

  Further, the + 1st order recording light 14d is supplied to the upper surface side of the hologram disk 19 through the polarization optical element 24, the phase adjustment element 25, the polarization optical element 26, the beam shape shaping optical element 23, and the transparent glass substrate 20.

  Further, the −1 primary recording light 14 e is supplied to the upper surface side of the hologram disk 19 through the polarization optical element 27, the phase adjustment element 28, the polarization optical element 29, the beam shape shaping optical element 23, and the transparent glass substrate 20.

  Here, the beam shape shaping optical element 23 is formed by a cylindrical lens as shown in FIGS. 2 to 4, and the beam shape shaping optical element 23 is provided with openings at predetermined intervals in the radial direction of the hologram disk 19. Yes.

  The polarization optical element 24 is for polarizing the + 1st order recording light 14d toward the phase adjusting element 25, and the polarization optical element 26 is for the 0th order recording of the beam shape shaping optical element 23. It is for polarizing in the light 14c passing direction.

  Further, the polarization optical element 27 is for polarizing the −1st order recording light 14e toward the phase adjustment element 28, and the polarization optical element 29 is for the 0th order of the beam shape shaping optical element 23 to the −1st order recording light 14e. This is for polarizing in the passing direction of the next recording light 14c.

  That is, with these configurations, the 0th-order recording light 14c, the + 1st-order recording light 14d, and the −1st-order recording light 14e are irradiated on the same line in the hologram disk 19.

  As described above, the beam shape shaping optical element 23 is provided with openings at predetermined intervals in the radial direction of the hologram disk 19, so that the zero-order recording light 14c is seen from above the hologram disk 19 as shown in FIG. The recording light 14b composed of the + 1st order recording light 14d and the −1st order recording light 14e travels through the opening of the beam shaping optical element 23. From the lower side of the hologram disk 19, the reference light is as described above. 14a is progressing. At this time, in the hologram disc 19, the zero-order recording light 14c, the + 1st-order recording light 14d, and the −1st-order recording light 14e interfere with each other, and the same phenomenon as the Talbot effect well known in the diffraction grating occurs. The parts where the strength increases are regularly displayed. In this state, since the reference beam 14a is traveling from the opposite side, the interference between the recording beam 14b and the reference beam 14a is strongly generated in the portion where the light intensity is strengthened by the Talbot effect, and a hologram is formed in this portion. Is done.

  For this reason, as shown in FIG. 7A, the recording light 14b composed of the 0th-order recording light 14c, the + first-order recording light 14d, and the −1st-order recording light 14e interferes with the reference light 14a. A hologram 30 is formed.

  In FIG. 7, only one layer of the hologram 30 is shown. However, due to the Talbot effect, a plurality of holograms 30 are simultaneously formed in the thickness direction in the hologram disk 19 for each Talbot distance T / 2 peculiar to the Talbot effect. It has come to be.

  Returning to FIG. 1 again, the description will be continued. The phase adjustment element 25 is for adjusting the phase of the + 1st order recording light 14d, and the phase adjustment element 28 is for adjusting the phase of the −1st order recording light 14e. Therefore, the adjustment directions of the phase adjustment elements 25 and 28 are reversed.

  For example, the phase adjusting element 25 changes the + 1st order recording light 14d from 0 to ¼ · λ in a direction in which the phase gradually advances, and the phase adjusting element 28 changes the −1st order recording light 14e from 0. The phase is gradually changed to 1/4 · λ in a direction of gradually delaying the phase.

  As a result, when the phase change of the phase adjusting elements 25 and 28 is 0 as shown in FIG. 8A, the + 1st order recording light 14d is changed in a direction to advance the phase to 1/4 · λ, and the −1st order. When the recording light 14e is changed from 0 to 1/4 · λ, the hologram 30 can be moved by p / 4 as shown in FIG. 8B.

  In FIG. 8A, 14C is the 0th-order light wavefront, 14D is the + 1st-order lightwavefront, 14E is the −1st-order lightwavefront, and p is the distance between the holograms 30.

  In this embodiment, the length of the beam shape shaping optical element 23 is 60 mm, the diameter of the hologram disk 19 is 120 mm, and the distance between the beam shape shaping optical element 23 and the hologram disk 19 is 20 mm.

  Now, in the present embodiment in the configuration as described above, by rotating the hologram disk 19 four times, a spiral hologram 30 is formed as shown in FIG.

  Therefore, at the first rotation of the hologram disk 19, the phase adjustment element 25 changes the phase of the + 1st order recording light 14d from 0 to ¼ · λ in the direction of advancing gradually, and the phase adjustment element 28 The −1st order recording light 14e is changed from 0 to ¼ · λ in a direction in which the phase is gradually delayed.

  Then, as shown in FIG. 5A, the hologram disk 19 in which the start end and the end end are not connected is, for example, four circles (actually, it is formed in a larger number than this, but in order to avoid complication of the drawing, the four circles are used) It is formed.

  The reason why the start end and the end end are not connected in this way is that the phase adjusting element 25 changes the phase of the + 1st order recording light 14d from 0 to ¼ · λ in the direction in which the phase adjusting element 28 is gradually advanced. Thus, the −1st order recording light 14e is changed from 0 to ¼ · λ in a direction in which the phase is gradually delayed, so that the diameter gradually increases.

  Subsequently, in the second rotation of the hologram disc 19, the phase adjusting element 25 changes the phase of the + 1st-order recording light 14d from 1/4 · λ to 2/4 · λ in a gradually advanced direction, The phase adjusting element 28 changes the −1st-order recording light 14e from ¼ · λ to 2/4 · λ in a direction that gradually delays the phase.

  Then, in the second rotation of the hologram disc 19, as shown in FIGS. 5B and 7B, the second rotation hologram 30 is formed outward from the end point of the first rotation, and the hologram to be formed. The diameter of 30 gradually increases.

  FIG. 6 shows a state where the second rotation is entered, and the small circle 30a of the hologram 30 indicates the starting point of the first rotation.

  Subsequently, at the third rotation of the hologram disc 19, the phase adjustment element 25 changes the phase of the + 1st order recording light 14d from 2/4 · λ to 3/4 · λ in a gradually advanced direction, The phase adjusting element 28 changes the −1st-order recording light 14e from 2/4 · λ to 3/4 · λ in a direction in which the phase is gradually delayed.

  Then, at the third rotation of the hologram disk 19, as shown in FIG. 5C and FIG. 7C, the third rotation hologram 30 is formed outward from the end point of the second rotation. The diameter of 30 gradually increases.

  Subsequently, at the fourth rotation of the hologram disc 19, the phase adjusting element 25 changes the phase of the + 1st order recording light 14d from 3/4 · λ to 4/4 · λ in a gradually advanced direction, The phase adjusting element 28 changes the −1st order recording light 14e from 3/4 · λ to 4/4 · λ in a direction in which the phase is gradually delayed.

  Then, at the fourth rotation of the hologram disc 19, as shown in FIGS. 5D and 7D, the fourth rotation hologram 30 is formed outward from the end of the third rotation, and the hologram to be formed. The diameter of 30 gradually increases.

  As a result of the four rotations, a spiral hologram 30 is formed as shown in FIG.

  5D and 7D, only one spiral hologram 30 is shown. However, as described above, a plurality of holograms 30 are provided at predetermined intervals in the thickness direction of the hologram disk 19 due to the Talbot effect. Are simultaneously formed in a multilayer state.

  As described above, in the present embodiment, the spiral hologram 30 can be formed in a multilayer state by only rotating the hologram disk 19 only four times, and the productivity is extremely high.

  The hologram 30 thus formed is preformatted. During recording, the hologram 30 is intermittently lost by irradiating recording light from one surface of the hologram disk 19, thereby enabling digital recording. I do.

  Further, at the time of reproduction, reproduction light is irradiated from one surface of the hologram disk 19 and reproduction is performed with reflection information from the non-erased hologram 30.

  In the present embodiment, the phase of the + 1st order recording light 14d and the phase of the −1st order recording light 14e are changed by ¼ · λ per one rotation of the hologram disk 19. Of course, the amount of phase change is It is also possible to set other than 1/4 · λ. For example, when the phase of the + 1st order recording light 14d and the phase of the −1st order recording light 14e are changed by 1 / m · λ per rotation of the hologram disk 19 (m is an integer), one rotation of the hologram disk 19 In the meantime, since the formed hologram moves outward by p / m, a spiral hologram 30 is formed by m rotation.

  Further, the phase of the + 1st order recording light 14d and the phase of the −1st order recording light 14e are not gradually changed, but discontinuously by 1 / m · λ (m is an integer) for each rotation of the hologram disk 19. In this case, when the hologram 19 rotates m, a concentric hologram having a pitch of p / m is formed.

  As described above, the present invention provides a support that rotatably supports a hologram disk, a light source that supplies reference light to one side of the hologram disk supported by the support, and recording light to the other side, and the light source. Recording light supplied to the other surface side of the hologram disc from zero order recording light, at least plus (hereinafter expressed as +) primary recording light, and minus (hereinafter expressed as −) primary recording light A diffraction grating that diffracts, a first phase adjustment element that adjusts the phase of the + 1st order recording light diffracted by the diffraction grating, and the + 1st order recording light that is phase-adjusted by the first phase adjustment element A first polarization optical element that is guided to the irradiation portion of the hologram disk of the next recording light by polarization, a second phase adjustment element that adjusts the phase of the −1st order recording light diffracted by the diffraction grating, and this second Phase by the phase adjustment element of A second polarization optical element that guides the aligned first-order recording light to the irradiation part of the hologram disk of the zero-order recording light, and is interposed between the first and second polarization optical elements and the hologram disk At the same time, the beam shape shaping optics through which the 0th-order recording light, the + 1st order recording light phase-adjusted by the first phase adjustment element, and the −1st order recording light phase-adjusted by the second phase adjustment element pass. Therefore, the productivity of the recording medium can be improved.

  That is, according to the present invention, it is not necessary to previously form a master disk and a conjugated master disk that have been used in the past, and a plurality of hologram layers can be formed directly in a recording medium. It will be expensive.

  Therefore, it is widely used for manufacturing a large-capacity recording medium.

DESCRIPTION OF SYMBOLS 14 Light source 14a Reference light 14b Recording light 14c 0th order recording light 14d + 1st order recording light 14e -1 primary recording light 15 Half mirror 16 Mirror 17 Diffraction grating 18 Transparent rotary table 19 Hologram disk 20 Transparent glass substrate 21 Rotating shaft 22 Lid 23 Beam Shape-forming optical element 24, 27, 26, 29 Polarizing optical element 25, 28 Phase adjustment element 30 Hologram

Claims (5)

A support that rotatably supports the hologram disk, a light source that supplies reference light to one surface side of the hologram disk supported by the support, and recording light to the other surface side, and the other surface side of the hologram disk from this light source Recording light supplied to the diffraction grating is diffracted into zero-order recording light, at least plus (hereinafter expressed as +) primary recording light, and minus (hereinafter expressed as-) primary recording light, and this diffraction A first phase adjusting element that adjusts the phase of the + 1st order recording light diffracted by the grating, and the + 1st order recording light that is phase-adjusted by the first phase adjusting element are irradiated onto the hologram disk of the 0th order recording light. The phase is adjusted by the first polarizing optical element that is polarized and guided to the part, the second phase adjusting element that adjusts the phase of the −1st order recording light diffracted by the diffraction grating, and the second phase adjusting element. -1 primary record Is polarized between the first-order recording light and the hologram disk, and the second-order recording light is interposed between the first and second polarization-optical elements and the hologram disk. A recording medium comprising: a + 1st order recording light phase-adjusted by the first phase adjustment element; and a beam shape shaping optical element through which a −1st order recording light phase-adjusted by the second phase adjustment element passes. Manufacturing equipment. 2. The recording medium manufacturing apparatus according to claim 1, wherein the beam shape shaping optical element is formed by a cylindrical lens, and the cylindrical lens is provided with openings at a predetermined interval in a radial direction of the hologram disk. A recording medium manufacturing method using the recording medium manufacturing apparatus according to claim 1, wherein the beam shape shaping optical element is placed at a predetermined interval on the other surface side of the hologram disk supported by the support. Then, the support that supports the hologram disk is rotated and the phases of the + 1st order recording light and the −1st order recording light are gradually changed in opposite directions by the first and second phase adjusting elements. A method for manufacturing a recording medium. The first phase adjustment element changes the + 1st order recording light in a direction in which the phase is gradually advanced, and the second phase adjustment element changes the −1st order recording light in a direction in which the phase is gradually delayed. A method for manufacturing a recording medium according to claim 3. With one rotation of the hologram disk, the first phase adjusting element changes the phase of the + 1st order recording light from 0 to ¼ · λ in a gradually advanced direction, and the second phase adjusting element The primary recording light is changed from 0 to ¼ · λ in a direction that gradually delays the phase, and the first phase adjustment element changes the phase of the primary recording light by two rotations of the hologram disc. The phase is gradually changed from 1/4 · λ to 2/4 · λ, and the second phase adjusting element changes the −1st order recording light from 1/4 · λ to 2/4 · λ. In the direction in which the phase is gradually delayed, and in the three rotations of the hologram disk, the first phase adjustment element gradually advances the phase of the + 1st order recording light from 2/4 · λ to 3/4 · λ. The first phase recording light is changed from 2/4 · λ by the second phase adjusting element. The phase is gradually changed to / 4 · λ and the hologram disc is rotated four times, and the first phase adjusting element changes the phase of the + 1st order recording light from 3/4 · λ to 4 / 4 · λ is gradually changed in the direction of advancement, and the second phase adjusting element is used to change the −1st order recording light from 3/4 · λ to 4/4 · λ in a direction in which the phase is gradually delayed. The manufacturing method of the recording medium of Claim 4.

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