JP5733505B2 - Manufacturing method of transmissive edge-lit hologram - Google Patents

Description

  The present invention relates to an edge-lit hologram that can be manufactured using total reflection, and more particularly to a method for manufacturing a transmission-type edge-lit hologram that manufactures an edge-lit hologram from an edge-lit hologram master.

  Conventionally, an edge-lit hologram using total reflection in a light guide plate or a prism is known (Non-Patent Document 1). As such an edge-lit hologram, a method of manufacturing a transmission-type edge-lit hologram is disclosed (Patent Document 1).

Japanese Patent Laid-Open No. 2001-337587 JP-A-6-301322

Toshihiro Kubota, “Introduction to Holography” (1995.11) Asakura Shoten, p74, p75

  In general, as shown in FIG. 18, a transmissive hologram is manufactured by laminating a transmissive hologram master 101 and a hologram recording material 102 and irradiating a laser beam 111 from one direction from the transmissive hologram master 101 side. This is performed by causing the zero-order light 112 transmitted through the original 101 to interfere with the primary light 113 diffracted by the transmission hologram original 101 in the hologram recording material 102.

  However, actually, the transmission hologram master 101 irradiated with the laser beam 111 is not limited to the primary light 113 but the secondary light as compared with the reflection hologram that is difficult to emit the −1st order diffracted light and the 2nd order diffracted light. 114 or −1st order light 115 is easily diffracted, and this extra diffracted light may interfere with the hologram recording material 102.

  The present invention has been made in view of the above-described problems of the prior art, and its purpose is to reduce the labor and time by a simple process and to provide an efficient and stable method for producing a transmission type edge-lit hologram. Is to provide.

The transmission-type edge-lit hologram manufacturing method of the present invention that achieves the above object absorbs, in order from one side, a reflection-type edge-lit hologram master, a hologram photosensitive material, and at least the recording wavelength light of the reflection-type edge-lit hologram original. A light absorbing layer is disposed, and laser light is incident on the hologram sensitive material from the reflective edge-lit hologram original plate side, and the object light transmitted through the reflective edge-lit hologram original plate and the reflective edge-lit hologram original plate The reference light that is diffracted and totally internally reflected by the laser light incident surface of the reflection-type edge-lit hologram original plate interferes with the hologram photosensitive material, thereby forming interference fringes in the hologram photosensitive material. .

  The reflection type edge-lit hologram original plate includes at least a first reflection type edge-lit hologram original plate corresponding to the first wavelength and a second reflection type edge-lit hologram original plate corresponding to the second wavelength. It is characterized by forming.

  According to the present invention, it is possible to provide a method for manufacturing a transmission-type edge-lit hologram that is efficient and stable while reducing labor and time with a simple process.

It is a figure which shows the process for manufacturing a reflection type edge lit hologram original plate. It is a figure which shows the state which reproduced | regenerated the reflection type edge lit hologram original plate using the glass block. It is a figure which shows the state which reproduced | regenerated the reflection type edge lit hologram original plate using the glass block. It is a figure which shows the state which reproduced | regenerated the reflection type edge lit hologram original plate using the glass block. It is a figure which shows the state which reproduced | regenerated the reflection type edge lit hologram original plate using the glass block. It is a figure which shows the state which reproduced | regenerated the reflection type edge-lit hologram original plate, without using a glass block. It is a figure which shows the state which reproduced | regenerated the reflection type edge-lit hologram original plate, without using a glass block. It is a figure which shows the state which reproduced | regenerated the reflection type edge-lit hologram original plate, without using a glass block. It is a figure which shows the state which reproduced | regenerated the reflection type edge-lit hologram original plate, without using a glass block. It is a figure which shows the process for manufacturing a transmissive | pervious edge-lit hologram. It is a figure which shows the state which reproduced | regenerated the transmission-type edge-lit hologram. It is a figure which shows the process for manufacturing a transmissive | pervious edge-lit hologram. It is a figure which shows the state which reproduced | regenerated the transmission-type edge-lit hologram. It is a figure which shows what laminated | stacked each element original plate corresponding to a different wavelength as a reflection type edge lit hologram original plate. It is a figure which shows embodiment which applied embodiment of FIG. It is a figure which shows the manufacturing method of the reflection type hologram used in FIG. It is a figure which shows the state which reproduced | regenerated the reflection type hologram 3 'used in FIG. 15 using the glass block. It is a figure which shows the manufacturing method of a general transmission hologram.

  Hereinafter, a method for manufacturing a transmission-type edge-lit hologram according to the present invention will be described with reference to the drawings.

  First, a method for manufacturing the first-stage reflective edge-lit hologram master will be described. FIG. 1 is a diagram showing a process for manufacturing a reflective edge-lit hologram master.

  As shown in FIG. 1, the first glass block G1 is disposed on one side of the first hologram recording photosensitive material 1, and the second glass block G2 is disposed on the other side. The first glass block G1 and the second glass block G2 are preferably a rectangular parallelepiped or a cube.

  In the present embodiment, the surface of the first glass block G1 on the first hologram recording photosensitive material 1 side is the first surface G1a, and the second surface G1b, the third surface G1c, Let it be the fourth surface G1d. Further, the surface of the second glass block G2 on the first hologram recording photosensitive material 1 side is defined as a first surface G2a, and the second surface G2b, the third surface G2c, and the fourth surface are clockwise when viewed in FIG. Let G2d. Further, the first glass block G1 side of the first hologram recording photosensitive material 1 is defined as a first surface 1a, and the second surface 1b, the third surface 1c, and the fourth surface 1d in a clockwise direction when viewed in FIG. To do. Accordingly, the second glass block G2 side of the first hologram recording photosensitive material 1 is the third surface 1c.

  In the present embodiment, the first hologram recording photosensitive material 1 includes a first glass block G1 laminated on the first surface 1a side, and a second glass block G2 laminated on the second surface 1b side. The state is sandwiched between the first surface G1a and the first surface G2a of the second glass block G2. The refractive index of the first glass block G1 and the refractive index of the second glass block G2 are preferably as close as possible, and more preferably the same.

  The interface between the first surface 1a of the first hologram recording photosensitive material 1 and the first surface G1a of the first glass block G1 is configured to reduce a change in refractive index using an index matching liquid. Similarly, the interface between the second surface 1b of the first hologram recording photosensitive material 1 and the first surface G2a of the second glass block G2 is also configured to reduce the refractive index change by using an index matching liquid. Yes.

  In this state, the first object light 11 made of parallel light or substantially parallel light and the first reference light 12 made of parallel light or substantially parallel light of the same wavelength from the same light source coherent with the first object light 11 are provided as the first. The light is incident on the photosensitive material 1 for hologram recording.

  The first object light 11 enters the first glass block G1 from the third surface G1c, and enters the first surface 1a of the first hologram recording photosensitive material 1 through the first surface G1a. Further, the first reference light 12 enters the second glass block G2 from the fourth surface G2d, and enters the second surface 1b of the first hologram recording photosensitive material 1 through the first surface G2a.

  Note that a first light absorption layer A1 that absorbs the zero-order light of the first object light 11 and prevents reflection on the third surface G2c of the second glass block G2 opposite to the first hologram recording photosensitive material 1 is provided. Be placed. The first reference light 12 absorbs and reflects the 0th-order light of the first reference light 12 on the fourth surface G1d of the first glass block G1 opposite to the fourth surface G2d incident on the second glass block G2. A second light absorption layer A2 is disposed to prevent the above. By disposing the first light absorption layer A1 and the second light absorption layer A2, reflection inside the first glass block G1 and the second glass block G2 is minimized.

  The first object beam 11 and the first reference beam 12 interfere in the first hologram recording photosensitive material 1. When the first object light 11 and the first reference light 12 interfere with each other, interference fringes are generated in the first hologram recording photosensitive material 1. Thereafter, the first hologram recording photosensitive material 1 can be post-processed to produce a reflective edge-lit hologram master 1 '.

  2-5 is a figure which shows the state which reproduced | regenerated the reflection type edge-lit hologram using the glass block. In the present embodiment, the reflection-type edge-lit hologram original plate 1 ′ shown in FIG. 2 is rotated in the clockwise direction when viewed from the paper surface, the first surface 1′a, the second surface 1′b, the third surface 1′c, and the fourth surface. 1′d. Note that the interface between the reflective edge-lit hologram master 1 ′ and the third glass block G <b> 3 is configured to reduce the refractive index change by using an index matching liquid.

  As shown in FIG. 2, when the reflective edge-lit hologram master 1 'is manufactured, the third glass block G3 is laminated at the position where the first glass block G1 is laminated. And the 1st reproduction | regeneration illumination light 21 of the same direction as the 1st object light 11 shown in FIG. 1 injects from the 3rd surface G3c of the 3rd glass block G3. The first reproduction illumination light 21 enters the third glass block G3, and enters the reflective edge-lit hologram master 1 'from the first surface 1'a via the first surface G3a. Then, the first reproduction light 22 traveling in the same direction as the first reference light 12 shown in FIG. 1 is diffracted by the reflective edge-lit hologram master 1 ′. Then, the first reproduction light 22 can be extracted from the fourth surface G3d of the third glass block G3.

  Further, as shown in FIG. 3, when the reflective edge-lit hologram master 1 ′ is manufactured as in FIG. 2, after the third glass block G3 is laminated at the position where the first glass block G1 is laminated, The first reproduction illumination light 21 directed in the opposite direction to the first reference light 12 shown in FIG. 1 may be incident from the fourth surface G3d. The first reproduction illumination light 21 enters the third glass block G3, and enters the reflective edge-lit hologram master 1 'from the first surface 1'a via the first surface G3a. Then, the first reproduction light 22 traveling in the direction opposite to the first object light 11 shown in FIG. 1 is diffracted by the reflective edge-lit hologram master 1 ′. And the 1st reproduction | regeneration light 22 can be taken out from the 3rd surface G3c of the 3rd glass block G3.

  Furthermore, as shown in FIG. 4, when the reflective edge-lit hologram master 1 'is manufactured, the third glass block G3 may be laminated at the position where the second glass block G2 is laminated. And the 1st reproduction | regeneration illumination light 21 which goes to the opposite direction to the 1st object light 11 shown in FIG. 1 injects from the 3rd surface G3c of the 3rd glass block G3. The first reproduction illumination light 21 enters the third glass block G3, and enters the reflective edge-lit hologram master 1 'from the third surface 1'c via the first surface G3a. Then, the first reproduction light 22 traveling in the opposite direction to the first reference light 12 shown in FIG. 1 is diffracted by the reflective edge-lit hologram master 1 ′. Then, the first reproduction light 22 can be extracted from the fourth surface G3d of the third glass block G3.

  Further, as shown in FIG. 5, when the reflective edge-lit hologram master 1 ′ is manufactured as in FIG. 4, after the third glass block G3 is laminated at the position where the second glass block G2 is laminated, The 1st reproduction | regeneration illumination light 21 which goes to the same direction as the 1st reference light 12 shown in FIG. 1 may inject from the 4th surface G3d of the 3rd glass block G3. The first reproduction illumination light 21 enters the third glass block G3, and enters the reflective edge-lit hologram master 1 'from the third surface 1'c via the first surface G3a. Then, the first reproduction light 22 traveling in the same direction as the first object light 11 shown in FIG. 1 is diffracted by the reflective edge-lit hologram master 1 ′. And the 1st reproduction | regeneration light 22 can be taken out from the 3rd surface G3c of the 3rd glass block G3.

  In addition, the refractive index of the 1st glass block G1, the 2nd glass block G2, and the 3rd glass block G3 is so preferable that it is a near value, and if it is the same, it is more preferable. Further, the first glass block G1 or the second glass block G2 used at the time of manufacturing the reflective edge-lit hologram master 1 'may be used at the time of reproduction.

  6 to 9 are views showing a state in which a reflection type edge-lit hologram is reproduced without using a glass block.

As shown in FIG. 6, the first reproduction illumination light 21 in the same direction as the first object light 11 shown in FIG. 1 is incident on the first surface 1′a of the reflective edge-lit hologram master 1 ′. Then, the first reproduction light 22 traveling in the same direction as the first reference light 12 is diffracted by the reflective edge-lit hologram master 1 ′. Here, a prism P or the like is disposed on the second surface 1′b side of the reflective edge-lit hologram master 1 ′. Then, the first reproduction light 22 exits the second surface 1′b of the reflective edge-lit hologram master 1 ′, and then enters the prism P from the first surface P1, and the second surface P2 and the third surface P3. Then, the light is guided while being totally reflected and emitted from the fourth surface P4.

  Further, as shown in FIG. 7, the first reproduction illumination light 21 in the direction opposite to the first object light 11 shown in FIG. 1 is incident on the third surface 1′c of the reflective edge-lit hologram master 1 ′. Also good. Then, the first reproduction light 22 traveling in the direction opposite to the first reference light 12 is diffracted by the reflective edge-lit hologram master 1 ′. Here, a prism P or the like is disposed on the second surface 1'b side of the reflective edge-lit hologram master 1 '. Then, the first reproduction light 22 exits the second surface 1′b of the reflective edge-lit hologram master 1 ′, and then enters the prism P from the first surface P1, and the second surface P2 and the third surface P3. Then, the light is guided while being totally reflected and emitted from the fourth surface P4.

  Further, as shown in FIG. 8, the first reproduction illumination light 21 in the direction opposite to the first reference light 12 shown in FIG. 1 is incident on the second surface 1′b of the reflective edge-lit hologram master 1 ′. . Then, diffracted light of the first reproduction light 22 is emitted in a direction opposite to the first object light 11 at a certain position while totally reflecting and guiding the inside of the reflection type edge-lit hologram master 1 ′. The reproduction as shown in FIG. 8 is suitable for a backlight of a liquid crystal display device.

  Further, as shown in FIG. 9, the first reproduction illumination light 21 in the same direction as the first reference light 12 shown in FIG. 1 is incident on the fourth surface 1′d of the reflective edge-lit hologram master 1 ′. Also good. Then, the diffracted light of the first reproduction light 22 is emitted in the same direction as the first object light 11 while being totally reflected and guided in the reflection type edge-lit hologram master 1 ′. The reproduction as shown in FIG. 9 is suitable for a backlight of a liquid crystal display device.

  Next, a method for producing a transmission type edge-lit hologram using the reflection type edge-lit hologram master 1 'will be described. FIG. 10 is a diagram illustrating a process for manufacturing a transmission-type edge-lit hologram.

  In the present embodiment, as shown in FIG. 10, the reflective edge-lit hologram master 1 ′ is disposed on the first surface 2a side of the second hologram recording photosensitive material 2, and the light absorption layer A is disposed on the second surface 2b side. Deploy. That is, the reflective edge-lit hologram original plate 1 ′, the second hologram recording photosensitive material 2, and the light absorption layer A are laminated in order from one side. The refractive index of the reflective edge-lit hologram master 1 'and the second hologram recording photosensitive material 2 may be such that the reflected light at the interface between the stacked layers is negligible. Further, the closer the refractive indexes of the reflective edge-lit hologram master 1 'and the second hologram recording photosensitive material 2 are, the better, and the same value is preferable.

  In this state, the first reproduction illumination light 21 of the reflective edge-lit hologram master 1 ′ is irradiated with the same wavelength and angle as the first object light 11 at the time of manufacture of the reflective edge-lit hologram master 1 ′ shown in FIG. . In the present embodiment, the light is incident perpendicularly to the first surface 1'a of the reflective edge-lit hologram master 1 '.

  Then, the 0th-order light of the first reproduction illumination light 21 is transmitted through the reflective edge-lit hologram master 1 ′ and emitted from the third surface 1′c, and from the first surface 2a of the second hologram recording photosensitive material 2. Incident as second object light 31. Further, the first reproduction light 22 obtained by diffracting the first reproduction illumination light 21 by the reflection type edge-lit hologram master 1 ′ is totally reflected by the first surface 1′a of the reflection type edge-lit hologram original plate 1 ′ and is thirdly reflected. The light exits from the surface 1 ′ c and enters as the second reference light 32 from the first surface 2 a of the second hologram recording photosensitive material 2.

  The second object light 31 and the second reference light 32 interfere with each other in the second hologram recording photosensitive material 2. When the second object light 31 and the second reference light 32 interfere with each other, interference fringes are generated in the second hologram recording photosensitive material 2. Thereafter, the second hologram recording photosensitive material 2 can be post-processed to produce a transmissive edge-lit hologram 2 '.

  FIG. 11 is a diagram showing a state where a transmission type edge-lit hologram is reproduced. The fourth glass block G4 is arranged at the position where the second glass block G2 is arranged on the transmission type edge-lit hologram 2 ′ manufactured by the method shown in FIG. 10, and the second reproduction in the direction opposite to the second reference light 32 is performed. The illumination light 41 is incident from the second surface 2′b. Then, the second reproduction light 42 is diffracted from the first surface 2 ′ a of the transmission-type edge-lit hologram 2 ′ in the direction opposite to the second object light 31.

  Next, another method for producing a transmission-type edge-lit hologram using the reflection-type edge-lit hologram master 1 'will be described. FIG. 12 is a diagram illustrating a process for manufacturing a transmission-type edge-lit hologram.

  In this embodiment, as shown in FIG. 12, the reflective edge-lit hologram master 1 ′ is disposed on the second surface 2b side of the second hologram recording photosensitive material 2, and the light absorption layer A is disposed on the first surface 2a side. Deploy. That is, the reflective edge-lit hologram original plate 1 ′, the second hologram recording photosensitive material 2, and the light absorption layer A are laminated in order from one side. The refractive index of the reflective edge-lit hologram master 1 'and the second hologram recording photosensitive material 2 may be such that the reflected light at the interface between the stacked layers is negligible. Further, the closer the refractive indexes of the reflective edge-lit hologram master 1 'and the second hologram recording photosensitive material 2 are, the better, and the same value is preferable.

  In this state, the first reproduction illumination light 21 of the reflective edge-lit hologram master 1 ′ is irradiated in the same wavelength and in the opposite direction as the first object light 11 at the time of manufacture of the reflective edge-lit hologram master 1 ′ shown in FIG. To do. In the present embodiment, the light is incident perpendicular to the third surface 1'c of the reflective edge-lit hologram master 1 '.

  Then, the 0th-order light of the first reproduction illumination light 21 is transmitted through the reflective edge-lit hologram master 1 ′ and emitted from the first surface 1′a, and from the second surface 2b of the second hologram recording photosensitive material 2. Incident as second object light 31. The first reproduction light 22 obtained by diffracting the first reproduction illumination light 21 by the reflective edge-lit hologram original plate 1 ′ is totally reflected by the third surface 1′c of the reflective edge-lit hologram original plate 1 ′ and is first reflected. The light is emitted from the surface 1 ′ a and is incident as the second reference light 32 from the second surface 2 b of the second hologram recording photosensitive material 2.

  The second object light 31 and the second reference light 32 interfere with each other in the second hologram recording photosensitive material 2. When the second object light 31 and the second reference light 32 interfere with each other, interference fringes are generated in the second hologram recording photosensitive material 2. Thereafter, the second hologram recording photosensitive material 2 can be post-processed to produce a transmissive edge-lit hologram 2 '.

  FIG. 13 is a diagram showing a state where a transmission type edge-lit hologram is reproduced. The fourth glass block G4 is arranged at the position where the first glass block G1 is arranged on the transmission type edge-lit hologram 2 ′ manufactured by the method shown in FIG. 12, and the second reproduction in the direction opposite to the second reference light 32 is performed. The illumination light 41 is incident from the first surface 2′a. Then, the second reproduction light 42 is diffracted from the second surface 2 ′ b of the transmissive edge-lit hologram 2 ′ in the direction opposite to the second object light 31.

  In addition, the refractive index of the 1st glass block G1, the 2nd glass block G2, and the 4th glass block G4 is so preferable that it is a near value, and if it is the same, it is more preferable. Further, the first glass block G1 or the second glass block G2 used at the time of manufacturing the reflective edge-lit hologram master 1 'may be used at the time of reproducing the transmission-type edge-lit hologram 2'.

  The object light, reference light, reproduction illumination light, and reproduction light of this embodiment are preferably a 532 nm DPSS laser or the like, but may be other lasers. Further, as the hologram recording photosensitive material, those described in Patent Document 2 are preferably used, but other materials may be used. Further, the wavelength or angle of the object light or the reference light and the reproduction illumination light can be changed by changing the refractive index of the glass block or the hologram recording photosensitive material.

  Here, the case where the element original plates corresponding to different wavelengths are laminated as the reflection type edge-lit hologram original plate will be described. In general, a transmission hologram has a large chromatic dispersion. Therefore, when a transmission hologram recorded at a plurality of wavelengths is reproduced at the same time, unexpected diffraction may be caused at each wavelength. Therefore, it has been difficult to manufacture a transmission hologram using a plurality of wavelengths simultaneously. Since the hologram master according to the present invention uses a reflection type edge-lit hologram, unnecessary diffraction does not occur even when light having a plurality of wavelengths is used during reproduction. In addition, by stacking a plurality of reflective edge-lit hologram masters corresponding to a plurality of wavelengths, it becomes possible to provide a degree of freedom in angle at each wavelength.

  FIG. 14 is a diagram showing a reflection-type edge-lit hologram original plate in which element original plates corresponding to different wavelengths are laminated. In the present embodiment, the red reflective edge-lit hologram master 1′R corresponding to the red wavelength, the green reflective edge-lit hologram master 1′G corresponding to the green wavelength, and the blue reflective edge-lit corresponding to the blue wavelength. A color transmission hologram is manufactured using the hologram master 1′B.

  As shown in FIG. 14, on one side of the second hologram recording photosensitive material 2, a red reflection type edge-lit hologram original plate 1′R, a green reflection type edge-lit hologram original plate 1′G, and a blue reflection type edge-lit hologram original plate 1 ′. B is disposed, and the light absorption layer A is disposed on the other side. That is, in order from one side, the red reflection type edge-lit hologram original plate 1′R, the green reflection type edge-lit hologram original plate 1′G, the blue reflection type edge-lit hologram original plate 1′B, the second hologram recording photosensitive material 2 and the light absorption. Layer A is laminated. The order of the red reflection type edge-lit hologram original plate 1'R, the green reflection type edge-lit hologram original plate 1'G, and the blue reflection type edge-lit hologram original plate 1'B is not limited to this, and may be changed.

  In this state, the first reproducing illumination light 21 is made up of the light absorption layer A of the red reflection type edge-lit hologram original plate 1′R, the green reflection type edge-lit hologram original plate 1′G, and the blue reflection type edge-lit hologram original plate 1′B. Irradiate from the other side. In the present embodiment, the light is incident perpendicularly to the first surface 1'Ra of the red reflection type edge-lit hologram master 1'R.

  Then, the 0th-order light of the first reproduction illumination light 21 passes through the reflective edge-lit hologram master 1 ′ and enters the second hologram recording photosensitive material 2 as the second object light 31. Further, the red first reproduction light 22R obtained by diffracting the first reproduction illumination light 21 by the red reflection type edge-lit hologram master 1′R is totally reflected by the first surface 1′Ra, and the second hologram recording photosensitive material 2 is obtained. Is incident as red second reference light 32R.

  Similarly, the green first reproduction light 22G obtained by diffracting the first reproduction illumination light 21 by the green reflection type edge-lit hologram master 1′G is totally reflected by the first surface 1′Ra, and the second hologram recording photosensitive material. The blue first reproduction light 22B, which is incident as the green second reference light 32G and is diffracted by the blue reflection type edge-lit hologram master 1′B, is totally reflected by the first surface 1′Ra. Then, the light enters the second hologram recording photosensitive material 2 as the blue second reference light 32B.

  The second object light 31, the red second reference light 32R, the green second reference light 32G, and the blue second reference light 32B interfere with each other in the second hologram recording photosensitive material 2. When the second object light 31 interferes with the red second reference light 32R, the green second reference light 32G, and the blue second reference light 32B, interference fringes are generated in the second hologram recording photosensitive material 2. Thereafter, the second hologram recording photosensitive material 2 can be post-processed to produce a color transmissive edge-lit hologram 2 '.

  In addition, the incident / exit angle of each element original plate may be different. Since a reflection hologram is used as an original, crosstalk of incident / exit light in each element original does not occur even when a plurality of wavelengths are used.

  FIG. 15 is a diagram showing an embodiment in which the embodiment of FIG. 10 is applied.

  In the embodiment shown in FIG. 15, the reflection type edge-lit hologram master 1 ′ is disposed on the first surface 2a side of the second hologram recording photosensitive material 2, the light absorption layer A is disposed on the second surface 2b side, and the reflection is performed. A reflective hologram 3 ′ is arranged on the opposite side of the photosensitive material 2 for recording the second hologram from the mold edge-lit hologram master 1 ′.

  That is, the reflective hologram 3 ′, the reflective edge-lit hologram master 1 ′, the second hologram recording photosensitive material 2, and the light absorption layer A are laminated in order from one side. The refractive index of the reflection hologram 3 ′, the reflection edge-lit hologram master 1 ′, and the second hologram recording photosensitive material 2 may be such that the reflected light at the interface between the stacked layers is negligible. Furthermore, the closer the refractive indexes of the reflective hologram 3 ′, the reflective edge-lit hologram master 1 ′, and the second hologram recording photosensitive material 2 are, the better, and the same value is preferable.

  In this state, the first reproduction illumination beam 51 of the reflective edge-lit hologram master 1 ′ is transmitted through the reflective hologram 3 ′, and the first object at the time of manufacturing the reflective edge-lit hologram master 1 ′ shown in FIG. Irradiate at the same wavelength and angle as the light 11. In the present embodiment, the light is incident perpendicularly to the first surface 1'a of the reflective edge-lit hologram master 1 '.

  Then, the 0th-order light of the first reproduction illumination light 51 passes through the reflective edge-lit hologram master 1 ′ and is emitted from the third surface 1′c, and from the first surface 2a of the second hologram recording photosensitive material 2. Incident as second object light 61. Further, the first reproduction light 52 obtained by diffracting the first reproduction illumination light 51 by the reflective edge-lit hologram original plate 1 ′ is reflected by the reflective hologram 3 ′ and the third surface 1 of the reflective edge-lit hologram original plate 1 ′. The light is emitted from 'c and enters as the second reference light 62 from the first surface 2a of the second hologram recording photosensitive material 2.

  The second object beam 61 and the second reference beam 62 interfere with each other in the second hologram recording photosensitive material 2. When the second object beam 61 and the second reference beam 62 interfere with each other, interference fringes are generated in the second hologram recording photosensitive material 2. Thereafter, the second hologram recording photosensitive material 2 can be post-processed to produce a transmissive edge-lit hologram 2 '.

  As described above, by using the reflection hologram 3 ′, it is possible to maintain high coherence between the object light and the reference light, and it is possible to clarify the contrast of the interference fringes of the transmission edge-lit hologram 2 ′. It becomes.

  Here, a manufacturing method of the reflection hologram 3 'will be described.

  FIG. 16 is a diagram showing a method for manufacturing the reflection hologram 3 ′ used in FIG. 15.

  As shown in FIG. 16, the fifth glass block G5 is arranged on one side of the hologram recording photosensitive material 3, and the sixth glass block G6 is arranged on the other side. The fifth glass block G5 and the sixth glass block G6 are preferably a rectangular parallelepiped or a cube.

  In the present embodiment, the surface of the fifth glass block G5 on the hologram recording photosensitive material 3 side is the first surface G5a, and the second surface G5b, the third surface G5c, The fourth surface is G5d. The surface of the sixth glass block G6 on the hologram recording photosensitive material 3 side is defined as a first surface G6a, and the second surface G6b, the third surface G6c, and the fourth surface are clockwise when the paper surface of FIG. G6d. Further, the fifth glass block G5 side of the hologram recording photosensitive material 3 is defined as a first surface 3a, and the second surface 3b, the third surface 3c, and the fourth surface 3d are clockwise when viewed in FIG. Therefore, the sixth glass block G6 side of the hologram recording photosensitive material 3 is the third surface 3c.

  In the present embodiment, the photosensitive material 3 for hologram recording has a fifth glass block G5 laminated on the first surface 3a side, a sixth glass block G6 laminated on the third surface 3c side, and the first surface of the fifth glass block G5. The state is held between G5a and the first surface G6a of the sixth glass block G6. The refractive index of the fifth glass block G5 and the refractive index of the sixth glass block G6 are preferably as close as possible, and more preferably the same.

  The interface between the first surface 3a of the hologram recording photosensitive material 3 and the first surface G5a of the fifth glass block G5 is configured to reduce the refractive index change by using an index matching liquid. Similarly, the interface between the third surface 3c of the hologram recording photosensitive material 3 and the first surface G6a of the sixth glass block G6 is configured so that the refractive index change is reduced by using an index matching liquid.

  In this state, the first object light 71 made of parallel light or substantially parallel light and the first reference light 72 made of parallel light or substantially parallel light from the same light source coherent with the first object light 71 are recorded on the hologram. Is incident on the photosensitive material 3.

  The first object light 71 is incident on the fifth glass block G5 and is incident on the first surface 3a of the hologram recording photosensitive material 3 through the first surface G5a. The first reference beam 72 is incident on the sixth glass block G6 and is incident on the third surface 3c of the photosensitive material 3 for hologram recording through the first surface G6a.

  A light absorbing layer A that absorbs the zero-order light of the first object light 71 and prevents reflection is disposed on the fourth surface G5d of the fifth glass block G5 and the second surface G6b of the sixth glass block G6. By disposing the light absorption layer A, reflection inside the fifth glass block G5 and the sixth glass block G6 is minimized.

  The first object beam 71 and the first reference beam 72 interfere in the hologram recording photosensitive material 3. When the first object beam 71 and the first reference beam 72 interfere with each other, interference fringes are generated in the hologram recording photosensitive material 3. Thereafter, the hologram recording photosensitive material 3 can be post-processed to produce a reflective hologram 3 '.

  FIG. 17 is a diagram showing a state where the reflection hologram 3 ′ used in FIG. 15 is reproduced using a glass block. In the present embodiment, the reflection type hologram 3 ′ of FIG. 17 is viewed in the clockwise direction when viewed from the front of the page, the first surface 3′a, the second surface 3′b, the third surface 3′c, and the fourth surface 3 Let 'd be. Note that the interface between the reflection hologram 3 ′ and the seventh glass block G <b> 7 is configured using an index matching liquid so that the refractive index change is reduced.

  As shown in FIG. 17, when the reflection hologram 3 'is manufactured, the seventh glass block G7 is laminated at the position where the fifth glass block G5 is laminated. And the 1st reproduction | regeneration illumination light 81 of the same direction as the 1st object light 71 shown in FIG. 16 injects from the 2nd surface G7b of the 7th glass block G7. The first reproduction illumination light 81 enters the seventh glass block G7, enters the reflective hologram 3 'from the first surface 3'a via the first surface G7a. Then, the first reproduction light 82 traveling in the same direction as the first reference light 72 shown in FIG. 16 is diffracted by the reflection hologram 3 ′. Then, the first reproduction light 82 can be extracted from the fourth surface G7d of the seventh glass block G7.

  A dielectric multilayer mirror may be used in place of the reflection hologram 3 '. The dielectric multilayer mirror is a laminated body of optical thin films made of a plurality of dielectric materials having different refractive indexes. In the state shown in FIG. 15, when a dielectric multilayer mirror is installed instead of the reflection hologram 3 ′, the first reproduction illumination light 51 is transmitted, but the first reproduction light 52 may be designed to reflect. .

  Thus, according to the transmissive edge-lit hologram manufacturing method of the present embodiment, in order from one side, the reflective edge-lit hologram original plate 1 ′, the second hologram recording photosensitive material 2, and at least the reflective edge-lit hologram original plate. A light absorbing layer A that absorbs light having a wavelength around the recording wavelength of 1 ′ is arranged, and laser light is incident on the second hologram recording photosensitive material 2 from the reflective edge-lit hologram master 1 ′ side to reflect the reflective edge The second hologram recording photosensitive material 2 is diffracted by the object beam 31 transmitted through the lit hologram original plate 1 'and the laser beam incident surface of the reflective edge lit hologram original plate 1' and totally reflected by the reflection type edge lit hologram original plate 1 '. Since the reference beam 32 incident on the beam interferes to form interference fringes in the hologram photosensitive material 2, labor and time can be reduced with a simple process. Both can provide a method for producing efficiently a stable transmission edge-lit hologram.

  The reflection-type edge-lit hologram original plate 1 ′ includes at least a first reflection-type edge-lit hologram original plate 1′R corresponding to the first wavelength and a second reflection-type edge-lit hologram original plate 1 corresponding to the second wavelength. Since “G” is laminated and formed, the transmission-type edge-lit hologram 2 ′ can have a degree of freedom.

  Further, a reflective hologram 3 ′ or dielectric that transmits laser light to the opposite side of the hologram sensitive material 2 with respect to the reflective edge-lit hologram master 1 ′ and reflects the diffracted light of the reflective edge-lit hologram master 1 ′. Since an optical element such as a multilayer mirror is included, it is possible to maintain high coherence between the object light and the reference light, and to clarify the contrast of the interference fringes of the transmissive edge-lit hologram 2 ′.

  As mentioned above, although the manufacturing method of the edge lit hologram of this invention has been demonstrated based on embodiment, this invention is not limited to these embodiment, A various deformation | transformation is possible.

DESCRIPTION OF SYMBOLS 1 ... Photosensitive material for 1st hologram recording 1 '... Reflective type edge-lit hologram original plate 2 ... Photosensitive material for 2nd hologram recording (hologram sensitive material)
2 '... transmission type edge-lit hologram 3 ... photosensitive material for hologram recording 3' ... reflection hologram 11 ... first object beam 12 ... first reference beam 21 ... first reproduction illumination beam 22 ... first reproduction beam 31 ... second Object light 32 ... second reference light 41 ... second reproduction illumination light 42 ... second reproduction light 51 ... first reproduction illumination light 52 ... first reproduction light 61 ... second object light 62 ... second reference light 71 ... first Object light 72 ... first reference light 81 ... first reproduction illumination light 82 ... first reproduction light A ... light absorption layer

Claims (2)

In order from one side, a reflective edge-lit hologram master, a hologram light-sensitive material, and a light absorbing layer that absorbs at least the recording wavelength of the reflective edge-lit hologram master are arranged,
Laser light is incident on the hologram sensitive material from the reflective edge-lit hologram master side,
The object light transmitted through the reflective edge-lit hologram master, and diffracted by the reflective edge-lit hologram master and totally internally reflected at the laser light incident surface of the reflective edge-lit hologram master and enter the hologram sensitive material. A method for producing a transmission-type edge-lit hologram, wherein the reference light interferes to form interference fringes in the hologram sensitive material. The reflective edge-lit hologram master is at least:
A first reflection-type edge-lit hologram master corresponding to the first wavelength;
A second reflective edge-lit hologram master corresponding to the second wavelength;
The method of manufacturing a transmissive edge-lit hologram according to claim 1, wherein:

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