US4904033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for constructing holograms
Assignee: Fujitsu Ltd
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Filing: 1988-05-18
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Granted: 1990-02-27
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Expires: 2008-05-18
Abstract
Abstract A method for constructing a hologram by use of a master hologram which includes a predetermined pattern of interference fringes formed thereon by optical interference of a plurality of constructing coherent light beams incident at different angles. The method includes preparing a photosensitive medium, in which the hologram is to be formed, on the master hologram, and copying the master hologram onto the photo-sensitive medium by impinging copying light beams onto the master hologram at an incident angle different from the angles of the constructing beams.
Inventors
- 👤 Hiroyuki Ikeda
- 👤 Fumio Yamagishi
- 👤 Shinya Hasegawa
- 👤 Syunji Kitagawa
- 👤 Kozo Yamazaki
- 👤 Takefumi Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:00
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; G03H1/04; G03H1/20; G03H1/202; G03H1/0005; G03H1/26; G03H1/2645; G03H1/265; G03H2001/205; G03H2001/2605; G03H2001/261; G03H2001/2615; G03H2222/00; G03H2222/36; G03H2250/00; G03H2250/12; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
249 words
A method for constructing a hologram, forming a copy hologram, and reconstructing the copy hologram utilizing first order transmission diffraction beam, the transmission diffraction beam produced using a master hologram plate having a base plate with a master hologram including a predetermined pattern of interference fringes formed thereon by optical interference of a plurality of constructing coherent light beams incident upon the base at different angles, the constructing coherent light beams having incident angles different from the incident angles of a reconstruction beam of a copy hologram except for one specific point, said method comprising the steps of: (a) forming a photosensitive medium in which the hologram is to be formed, on a copy hologram plate; and (b) copying the master hologram onto the photosensitive medium by impinging a copying light beam onto the master hologram at an incident angle substantially different from the incident angles of the constructing coherent light beams, to produce a zero-order transmission beam passing through the associated interference fringes of the master hologram and a first order diffraction beam diffracted by the associated interference fringes of the master hologram, whereby a desired copy hologram having the same pattern of interference fringes as the master hologram is constructed in the photosensitive medium by optical interference of the zero-order transmission beam and the first-order diffraction beam, said copy hologram being reconstructed with a reconstruction beam substantially different from the constructing coherent light beams, so that a beam issuing from the copy hologram has a corrected aberration.
Claim 2
Independent Claim
249 words
A method for constructing a hologram, forming a copy hologram, and reconstructing the copy hologram utilizing first order transmission diffraction beam, the transmission diffraction beam produced using a master hologram plate having a base plate with a master hologram including a predetermined pattern of interference fringes formed thereon by optical interference of a plurality of constructing coherent light beams incident upon the base at different angles, the constructing coherent light beams having incident angles different from the incident angles of a reconstruction beam of a copy hologram except for one specific point, said method comprising the steps of: (a) forming a photosensitive medium in which the hologram is to be formed, on a copy hologram plate; and (b) copying the master hologram onto the photosensitive medium by impinging a copying light beam onto the master hologram at an incident angle substantially different from the incident angles of the constructing coherent light beams, to produce a zero-order transmission beam passing through the associated interference fringes of the master hologram and a first order diffraction beam diffracted by the associated interference fringes of the master hologram, whereby a desired copy hologram having the same pattern of interference fringes as the master hologram is constructed in the photosensitive medium by optical interference of the zero-order transmission beam and the first-order diffraction beam, said copy hologram being reconstructed with a reconstruction beam substantially different from the constructing coherent light beams, so that a beam issuing from the copy hologram has a corrected aberration.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said step (a) of forming the photosensitive medium comprises directly coating a photosensitive layer onto the master hologram plate.
Claim 4
Dependent Claim
52 words
A method according to claim 1, wherein said step (a) of forming the photosensitive medium comprises forming a copy hologram base plate having a photosensitive layer coated thereon and which is superimposed on the master hologram plate so that the photosensitive layer comes in close surface contact with the master hologram plate.
Claim 5
Dependent Claim
25 words
A method according to claim 1, wherein said step (b) comprises impinging the copying light beam onto the master hologram at an angle perpendicular thereto.
Claim 6
Dependent Claim
34 words
A method according to claim 1, wherein said step (b) comprises impinging the copying light beam at an incident angle identical to those of the first-order diffraction beams with respect to the photosensitive medium.
Claim 7
Dependent Claim
35 words
A method according to claim 1, wherein said step (b) comprises impinging the copying light beam at an incident angle such that the transmission beams and the first-order diffraction beams have the same diffraction efficiency.
Claim 8
Dependent Claim
75 words
A method according to claim 1, further comprising the step of coating a filtering layer on the master hologram prior to said step (a) of forming the photosensitive medium on the master hologram plate, the filtering layer having a transmittance which decreases as the incident angle of the beams incident thereupon, with respect to a line perpendicular to the filtering layer, increases, to selectively intercept the beams having an incident angle above a predetermined value.
Claim 9
Dependent Claim
25 words
A method according to claim 1, wherein said step (b) comprises impinging the copying light beam over the entire width of the master hologram plate.
Claim 10
Dependent Claim
22 words
A method according to claim 8, wherein said step (b) comprises scanning the copying light beam relative to the master hologram plate.
Claim 11
Dependent Claim
31 words
A method according to claim 8, wherein said step (b) comprises moving the master hologram plate together with the photosensitive layer for the copy hologram, relative to the copying light beam.
Claim 12
Dependent Claim
19 words
A method according to claim 1, wherein said step (b) comprises impinging spot-like beams as the copying light beam.
Claim 13
Dependent Claim
24 words
A method according to claim 12, wherein step (b) further comprises the step of scanning the spot-like beams relative to the master hologram plate.
Claim 14
Dependent Claim
36 words
A method according to claim 11, further comprising the step of moving the master hologram plate together with the photosensitive medium relative to the spot-like beams of the copying light beam for forming the copy hologram.
Claim 15
Independent Claim
370 words
A method for constructing a desired hologram, forming a copy hologram, and reconstructing the copy hologram utilizing a first order transmission diffraction beam, using a master hologram plate having a base plate with a master hologram including a predetermined pattern of interference fringes formed thereon by optical interference of a plurality of constructing coherent light beams incident upon the base plate at substantially different angles, the constructing coherent light beams having incident angles different from the incident angles of a reconstruction beam of a copy hologram except for one specific point, said method comprising: (a) forming a first photosensitive medium, in which a first hologram is to be formed, on the master hologram plate; (b) copying the master hologram onto the first photosensitive medium by impinging a first copying light beam onto the master hologram at an incident angle substantially different from the incident angles of the constructing coherent light beams, to produce a transmission beam passing through the associated interference fringes of the master hologram and first-order diffraction beams diffracted by the associated interference fringes of the master hologram, whereby a first copy hologram having the same pattern of interference fringes as the master hologram is constructed by optical interference of the transmission beam and the first-order diffraction beams; (c) forming a second photosensitive medium in which a second hologram is to be formed, on the first copy hologram; (d) copying the first copy hologram onto the second photosensitive medium by impinging a second copying light beam onto the first copy hologram at an incident angle substantially different from the incident angles of the constructing coherent light beams and the first copying light beam, to produce a zero-order transmission beam passing through the associated interference fringes of the master hologram and first order diffraction beams diffracted by the associated interference fringes of the master hologram, to construct a second hologram, having the same pattern of interference fringes as the master hologram, in the second photosensitive medium in a manner similar to the construction of the first copy hologram; and (e) reconstructing the second hologram with a reconstruction beam substantially different from the constructing coherent light beams so that a beam issuing from the second hologram has a corrected aberration.
Claim 16
Independent Claim
370 words
A method for constructing a desired hologram, forming a copy hologram, and reconstructing the copy hologram utilizing a first order transmission diffraction beam, using a master hologram plate having a base plate with a master hologram including a predetermined pattern of interference fringes formed thereon by optical interference of a plurality of constructing coherent light beams incident upon the base plate at substantially different angles, the constructing coherent light beams having incident angles different from the incident angles of a reconstruction beam of a copy hologram except for one specific point, said method comprising: (a) forming a first photosensitive medium, in which a first hologram is to be formed, on the master hologram plate; (b) copying the master hologram onto the first photosensitive medium by impinging a first copying light beam onto the master hologram at an incident angle substantially different from the incident angles of the constructing coherent light beams, to produce a transmission beam passing through the associated interference fringes of the master hologram and first-order diffraction beams diffracted by the associated interference fringes of the master hologram, whereby a first copy hologram having the same pattern of interference fringes as the master hologram is constructed by optical interference of the transmission beam and the first-order diffraction beams; (c) forming a second photosensitive medium in which a second hologram is to be formed, on the first copy hologram; (d) copying the first copy hologram onto the second photosensitive medium by impinging a second copying light beam onto the first copy hologram at an incident angle substantially different from the incident angles of the constructing coherent light beams and the first copying light beam, to produce a zero-order transmission beam passing through the associated interference fringes of the master hologram and first order diffraction beams diffracted by the associated interference fringes of the master hologram, to construct a second hologram, having the same pattern of interference fringes as the master hologram, in the second photosensitive medium in a manner similar to the construction of the first copy hologram; and (e) reconstructing the second hologram with a reconstruction beam substantially different from the constructing coherent light beams so that a beam issuing from the second hologram has a corrected aberration.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
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