Hologram recording material, hologram recording method and optical recording medium
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G03H-001/02
G03C-001/76
출원번호
UP-0237986
(2005-09-29)
등록번호
US-7572555
(2009-08-25)
우선권정보
JP-P. 2004-286247(2004-09-30)
발명자
/ 주소
Takizawa, Hiroo
Inoue, Noriko
출원인 / 주소
FUJIFILM Corporation
대리인 / 주소
Sughrue Mion, PLLC
인용정보
피인용 횟수 :
22인용 특허 :
7
초록▼
A hologram recording material is provided and includes at least a sensitizing dye capable of absorbing light having a hologram recording wavelength to generate an excited state thereof, and an interference fringe-recording component capable of recording interference fringes providing a refractive in
A hologram recording material is provided and includes at least a sensitizing dye capable of absorbing light having a hologram recording wavelength to generate an excited state thereof, and an interference fringe-recording component capable of recording interference fringes providing a refractive index modulation by an electron transfer or an energy transfer from the excited state, in which the sensitizing dye in the hologram recording material has a molar absorption coefficient within a range of 1 to 10,000 at the hologram recording wavelength.
대표청구항▼
What is claimed is: 1. A hologram recording material comprising: a sensitizing dye capable of absorbing light having a hologram recording wavelength to generate an excited state thereof; and an interference fringe-recording component capable of recording interference fringes providing a refractive
What is claimed is: 1. A hologram recording material comprising: a sensitizing dye capable of absorbing light having a hologram recording wavelength to generate an excited state thereof; and an interference fringe-recording component capable of recording interference fringes providing a refractive index modulation by an electron or energy transfer from the excited state, the hologram recording material has a thickness of 500 μm or larger, wherein the sensitizing dye in the hologram recording material comprises at least one of a cyanine dye and a merocyanine dye, and has a molar absorption coefficient within a range of 1 to 10,000 at the hologram recording wavelength; and the interference fringe-recording component is a component capable of recording the interference fringes providing a refractive index modulation by a latent image-sensitized polymerization reaction sensitized by a latent image of a residual of a color-erasable dye, and the component records the interference fringes by a method comprising: a first step in which: the sensitizing dye absorbs light upon holographic exposure to generate the excited state thereof, a color of a color-erasable dye is erased by at least one of: an energy or electron transfer from the excited state of the sensitizing dye directly to the color-erasable dye; and a color-erasing agent formed by an energy or electron transfer from the excited state of the sensitizing dye to a color-erasing agent precursor, the color-erasing agent precursor comprising at least one of a radical generator, an acid generator, a base generator, a nucleophilic agent generator, an electrophilic agent generator or a triplet oxygen, and a residual of the color-erasable dye forms a latent image; and a second step of irradiating the latent image of the residual of the color-erasable dye with light of a wavelength region, which is different from that of the holographic exposure, to cause a polymerization reaction by activating a polymerization initiator as a result of an energy or electron transfer from the residual of the color-erasable dye. 2. The hologram recording material according to claim 1, wherein the sensitizing dye in the hologram recording material has a molar absorption coefficient within a range of 5 to 2,500 at the hologram recording wavelength. 3. The hologram recording material according to claim 1, wherein the sensitizing dye in the hologram recording material has an absorption maximum within a region shorter in wavelength than the hologram recording wavelength by 20 to 100 nm. 4. The hologram recording material according to claim 1, wherein the sensitizing dye in the hologram recording material has a molar absorption coefficient equal to or less than 1/10 of the molar absorption coefficient at an absorption maximum thereof. 5. The hologram recording material according to claim 1, wherein the sensitizing dye in the hologram recording material has a molar absorption coefficient equal to or less than 1/20 of the molar absorption coefficient at the absorption maximum thereof. 6. The hologram recording material according to claim 1, wherein the sensitizing dye is a cyanine dye represented by formula (1): wherein R1 and R2 each independently represents an alkyl group, an alkenyl group, an alkynyl group or a cycloalkyl group; R3 and R4 each independently represents a substituent; and a3 and a4 each independently represents an integer of 0 to 4, and in a case a3 or a4 is 2 or larger, plural R3s or R4s are mutually same or different and may be mutually bonded to form a ring; R5, R6 and R7 each independently represents a hydrogen atom or a substituent, and may be mutually bonded to form a ring; n1 represents an integer of 0 to 2; CI represents a charge neutralizing ion; and y represents a number required for neutralizing the charge. 7. The hologram recording material according to claim 6, wherein a3 and a4 are both zero, n1 is 1, and the hologram recording wavelength is 532 nm. 8. The hologram recording material according to claim 1, wherein the sensitizing dye is a merocyanine dye represented by formula (2): wherein X1 represents O or S; X2 represents--O--,--S--,--NR17--, or--CR18R19--; R11 and R12 each independently represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aryl group or a heterocyclic group; R17, R18 and R19 each independently represents an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aryl group or a heterocyclic group; R13 represents an alkyl group, an alkenyl group, an alkynyl group, or a cycloalkyl group; R14 represents a substituent; a14 represents an integer of 0 to 4, and in case a14 is 2 or larger, plural R14s are mutually same or different or may be mutually bonded to form a ring; R15 and R16 each independently represents a hydrogen atom or a substituent, and may be mutually bonded to form a ring; and n2 represents an integer of 0 to 2. 9. The hologram recording material according to claim 8, wherein n2 is 1, and the hologram recording wavelength is 532 nm. 10. The hologram recording material according to claim 1, which has the sensitizing dye in such an amount as to have an optical transmittance of 30 to 90% when the hologram recording material is irradiated with the light having the hologram recording wavelength. 11. The hologram recording material according to claim 1, wherein the sensitizing dye absorbs the light upon holographic exposure in the first step to generate the excited state thereof, and the hologram recording material further comprises: a color-erasable dye capable of erasing a color thereof in the first step as a result of at least one of: an energy or electron transfer directly from the excited state of the sensitizing dye; and an generation of the color-erasing agent by an energy or electron transfer from the excited state of the sensitizing dye to the color-erasing agent precursor, the color-erasable dye having a molar absorption coefficient of 1,000 or less at a wavelength of a hologram reproducing light; a polymerizable compound; a polymerization initiator capable of initiating a polymerization of the polymerizable compound by an electron or energy transfer from the excited state of the residual of the color-erasable dye in the second step; and a binder. 12. The hologram recording material according to claim 1, wherein the interference fringes are unrewritable. 13. An optical recording medium comprising a hologram recording material according to claim 1. 14. The optical recording medium according to claim 13, wherein the hologram recording material is stored in a light-shielding cartridge. 15. A hologram recording method comprising recording interference fringes providing a refractive index modulation in a hologram recording material by at least one of 1) a polymerization reaction, 2) a color developing reaction, 3) a color developing reaction amplified by a self-sensitization with a color developed substance of a latent image, 4) a polymerization reaction sensitized with a color developed substance of a latent image, 5) an alignment change in a compound having a specific birefringence, and 6) a color erasing reaction of a dye, and a latent image-sensitized polymerization reaction sensitized by a latent image of a residual of a color-erasable dye, and the recording of the interference fringes comprising: a first step in which: the sensitizing dye absorbs light upon holographic exposure to generate the excited state thereof, a color of a color-erasable dye is erased by at least one of: an energy or electron transfer from the excited state of the sensitizing dye directly to the color-erasable dye; and a color-erasing agent formed by an energy or electron transfer from the excited state of the sensitizing dye to a color-erasing agent precursor, the color-erasing agent precursor comprising at least one of a radical generator, an acid generator, a base generator, a nucleophilic agent generator, an electrophilic agent generator or a triplet oxygen, and a residual of the color-erasable dye forms a latent image; and a second step of irradiating the latent image of the residual of the color-erasable dye with light of a wavelength region, which is different from that of the holographic exposure, to cause a polymerization reaction by activating a polymerization initiator as a result of an energy or electron transfer from the residual of the color-erasable dye, wherein the hologram recording material comprising: a sensitizing dye capable of absorbing light having a hologram recording wavelength to generate an excited state thereof; and an interference fringe-recording component capable of recording interference fringes providing a refractive index modulation by an electron or energy transfer from the excited state, the hologram recording material has a thickness of 500 μm or larger, wherein the sensitizing dye in the hologram recording material comprises at least one of a cyanine dye and a merocyanine dye, and has a molar absorption coefficient within a range of 1 to 10,000 at the hologram recording wavelength. 16. The hologram recording method according to claims 15, wherein a multiplex hologram recording is performed by effecting the holographic exposure 10 times or more. 17. The hologram recording method according to claim 16, wherein the multiplex hologram recording is performed under a common exposure amount in each holographic exposure.
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