HOLOGRAM RECORDING FILM AND METHOD OF MANUFACTURING SAME, AND IMAGE DISPLAY APPARATUS

• US 20100142015A1
• Filed: 12/08/2009
• Published: 06/10/2010
• Est. Priority Date: 12/09/2008
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kuwahara, Mieko, Akutsu, Katsuyuki, Yoshida, Takuji
• Granted Patent: US 8,982,437 B2
• Time in Patent Office: Days
• US Class Current: 359/3
• CPC Class Codes: G02B 2027/0109 comprising details concerning the making of holograms
• CPC Class Codes: G02B 27/0103 comprising holographic elements
• CPC Class Codes: G02B 5/32 Holograms used as optical elements
• CPC Class Codes: G03F 7/001 Phase modulating patterns, e.g. refractive index patterns
• CPC Class Codes: G03H 1/0248 Volume holograms
• CPC Class Codes: G03H 1/0272 Substrate bearing the hologram
• CPC Class Codes: G03H 1/04 Processes or apparatus for producing holograms G03H1/26 takes precedence
• CPC Class Codes: G03H 1/0408 Total internal reflection [TIR] holograms, e.g. edge lit or substrate mode holograms
• CPC Class Codes: G03H 2001/026 Recording materials or recording processes G03H2226/11 takes precedence; corresponding details, see subgroups of G03H2260/00
• CPC Class Codes: G03H 2001/0439 for recording Holographic Optical Element [HOE] HOE per se G02B5/32
• CPC Class Codes: G03H 2001/2615 in physical contact, i.e. layered holograms
• CPC Class Codes: G03H 2001/263 Made of different recording materials
• CPC Class Codes: G03H 2222/18 RGB trichrome light

Abstract

A hologram recording film manufacturing method includes the steps of obtaining a laminated structure by alternately laminating M (where M≧2) photosensitive material precursor layers including a photosensitive material and at least one (M−1) resin layer on one another, obtaining M photosensitive material layers, where at least two interference fringes with a desired pitch and a desired slant angle are formed on each of the M photosensitive material layers, from the M photosensitive material precursor layers by irradiating the laminated structure with a reference laser light beam and an object laser light beam, and making the slant angles of the M photosensitive material layers different from each other while retaining the pitch value, which is defined on a face of the photosensitive material layer, by irradiating the laminated structure with an energy ray from the laminated structure'"'"'s one face side, and heating the laminated structure.

Claims

1. A method of manufacturing a hologram recording film, the method comprising:

obtaining a laminated structure by alternately laminating M (where M≧

2) photosensitive material precursor layers including a photosensitive material and at least one (M−

1) resin layer on one another;

obtaining M photosensitive material layers, where at least two interference fringes with a desired pitch and a desired slant angle are formed on each of the M photosensitive material layers, from the M photosensitive material precursor layers by irradiating the laminated structure with a reference laser light beam and an object laser light beam; and

making the slant angles of the M photosensitive material layers different from each other while retaining a value of the pitch, the pitch being defined on a face of the photosensitive material layer, by irradiating the laminated structure with an energy ray from the laminated structure'"'"'s one face side, and heating the laminated structure subsequently.

2. The hologram recording film manufacturing method according to claim 1, wherein the energy ray is an ultraviolet ray.

3. The hologram recording film manufacturing method according to claim 1, wherein a reproduction center wavelength observed in the M photosensitive material layers is changed based on a value of M.

4. The hologram recording film manufacturing method according to claim 1,

wherein the resin layer includes a second photosensitive material precursor layer including a second photosensitive material;

and

wherein, at obtaining M photosensitive material layers, at least one (M−

1) second photosensitive material layer is obtained in addition to the M photosensitive material layers, where at least two second interference fringes with a desired pitch and a desired slant angle are formed on each of the at least one (M−

1) second photosensitive material layer, from the (M−

1) second photosensitive material precursor layer.

5. The hologram recording film manufacturing method according to claim 4, wherein photosensitive characteristics-for-the energy ray of the photosensitive material layer and the second photosensitive material layer are different from each other.

6. The hologram recording film manufacturing method according to claim 4, wherein photosensitive characteristics-for-the reference laser light beam and the object laser light beam of the photosensitive material precursor layer and the second photosensitive material precursor layer are different from each other.

7. The hologram recording film manufacturing method according to claim 6, wherein, at obtain, the photosensitive material precursor layer is irradiated with a first reference laser light beam and a first object laser light beam, and the second photosensitive material precursor layer is irradiated with a second reference laser light beam and a second object laser light beam.

8. The hologram recording film manufacturing method according to claim 1, wherein the resin layer includes a film absorbing part of the energy ray.

9. The hologram recording film manufacturing method according to claim 8, wherein the resin layer has an absorbing characteristic so that the resin layer absorbs 5% or more of an ultraviolet ray having a wavelength of 400 nm or less.

10. A hologram recording film comprising:

a laminated structure including M (where M≧

2) photosensitive material layers including a photosensitive material, where at least two interference fringes with a desired pitch and a desired slant angle are formed on each of the M photosensitive material layers, and at least one (M−

1) resin layer that are alternately laminated on one another,

wherein values of the pitches defined on faces of the M photosensitive material layers are identical to each other and the slant angles defined on the faces of the M photosensitive material layers are different from each other.

11. The hologram recording film according to claim 10, wherein a reproduction center wavelength observed in the M photosensitive material layers is changed based on a value of M.

12. The hologram recording film according to claim 10, wherein the resin layer includes at least one (M−

1) second photosensitive material layer including a second photosensitive material, and at least two second interference fringes with a desired pitch and a desired slant angle are formed on each of the at least one (M−

1) second photosensitive material layer.

13. The hologram recording film according to claim 10, wherein the resin layer includes a film absorbing part of the energy ray.

14. An image display apparatus comprising:

an image forming device having a plurality of pixels arranged in a two-dimensional matrix form;

a collimating optical system configured to make a light beam emitted from each of the pixels into a collimated light beam; and

an optical device onto which the collimated light beam is made incident, in which the collimated light beam is guided, and from which the collimated light beam is emitted,

wherein, the optical device includes

a light guide plate through which a light beam which is made incident on the light guide plate propagates through total reflection, and from which the light beam is emitted,

a first diffraction grating member provided in the light guide plate, the first diffraction grating member being configured to diffract and reflect the light beam which is made incident on the light guide plate so that the light beam which is made incident on the light guide plate is totally reflected inside the light guide plate, and

a second diffraction grating member provided in the light guide plate, the second diffraction grating member being configured to diffract and reflect the light beam which propagates through the light guide plate through the total reflection, and emit the light beam from the light guide plate,

wherein each of the first and second diffraction grating members includes a hologram recording film having

a laminated structure including M (where M≧

2) photosensitive material layers including a photosensitive material, where at least two interference fringes with a desired pitch and a desired slant angle are formed on each of the M photosensitive material layers, and at least one (M−

1) resin layer that are alternately laminated on one another,

wherein values of the pitches defined on faces of the M photosensitive material layers are identical to each other and the slant angles defined on the faces of the M photosensitive material layers are different from each other.

15. An image display apparatus comprising:

a light source,

a collimating optical system making a light beam emitted from the light source into a collimated light beam,

a scanning means configured to scan the collimated light beam emitted from the collimating optical system,

a relay optical system configured to relay the collimated light beam scanned through the scanning means, and

an optical device onto which the collimated light beam is made incident, in which the collimated light beam is guided, and from which the collimated light beam is emitted through the relay optical system,

wherein, the optical device includes

a light guide plate through which a light beam which is made incident on the light guide plate propagates through total reflection, and from which the light beam is emitted,

a first diffraction grating member provided in the light guide plate, the first diffraction grating member being configured to diffract and reflect the light beam which is made incident on the light guide plate so that the light beam which is made incident on the light guide plate is totally reflected inside the light guide plate, and

a second diffraction grating member provided in the light guide plate, the second diffraction grating member being configured to diffract and reflect the light beam which propagates through the light guide plate through the total reflection, and emit the light beam from the light guide plate,

wherein each of the first and second diffraction grating members includes a hologram recording film having

a laminated structure including M (where M≧

2) photosensitive material layers including a photosensitive material, where at least two interference fringes with a desired pitch and a desired slant angle are formed on each of the M photosensitive material layers, and at least one (M−

1) resin layer that are alternately laminated on one another,

wherein values of the pitches defined on faces of the M photosensitive material layers are identical to each other and the slant angles defined on the faces of the M photosensitive material layers are different from each other.

16. A method of manufacturing a hologram recording film, the method comprising the steps of:

obtaining a photosensitive material layer on which at least two interference fringes with a desired pitch and a desired slant angle are formed from a photosensitive material precursor layer including a photosensitive material by irradiating the photosensitive material precursor layer with a reference laser light beam and an object laser light beam; and

making the slant angles observed in regions of the photosensitive material layer different from each other while retaining a value of the pitch, the pitch being defined on a face of the photosensitive material layer, by irradiating the regions with energy rays with different energy amounts, and heating the photosensitive material layer.

17. The hologram recording film manufacturing method according to claim 16, wherein the energy ray is an ultraviolet ray.

18. The hologram recording film manufacturing method according to claim 16, wherein reproduction center wavelengths observed on the regions are different from each other.

19. The hologram recording film manufacturing method according to claim 16, wherein a reproduction center wavelength approaches a long-wavelength side as an irradiation amount of the energy ray is decreased.

20. An image display apparatus comprising:

a light source,

a collimating optical system making a light beam emitted from the light source into a collimated light beam,

a scanning unit configured to scan the collimated light beam emitted from the collimating optical system,

a relay optical system configured to relay the collimated light beam scanned through the scanning unit, and

an optical device onto which the collimated light beam is made incident, in which the collimated light beam is guided, and from which the collimated light beam is emitted through the relay optical system,

wherein, the optical device includes

a light guide plate through which a light beam which is made incident on the light guide plate propagates through total reflection, and from which the light beam is emitted,

a first diffraction grating member provided in the light guide plate, the first diffraction grating member being configured to diffract and reflect the light beam which is made incident on the light guide plate so that the light beam which is made incident on the light guide plate is totally reflected inside the light guide plate, and

a second diffraction grating member provided in the light guide plate, the second diffraction grating member being configured to diffract and reflect the light beam which propagates through the light guide plate through the total reflection, and emit the light beam from the light guide plate,

wherein each of the first and second diffraction grating members includes a hologram recording film having

a laminated structure including M (where M≧

2) photosensitive material layers including a photosensitive material, where at least two interference fringes with a desired pitch and a desired slant angle are formed on each of the M photosensitive material layers, and at least one (M−

1) resin layer that are alternately laminated on one another,

wherein values of the pitches defined on faces of the M photosensitive material layers are identical to each other and the slant angles defined on the faces of the M photosensitive material layers are different from each other.